TPS77015DBVT全新原装原理图各脚功能电路原理芯片引脚定义-中国IC网-芯三七

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

DBV PACKAGE

(TOP VIEW)

50-mA Low-Dropout Regulator

Available in 1.2-V, 1.5-V, 1.8-V, 2.5-V, 2.7-V,

2.8-V, 3.0-V, 3.3-V, and 5-V Fixed-Output and

Adjustable Versions

1

2

3

5

4

OUT

IN

GND

Only 17 µA Quiescent Current at 50 mA

1 µA Quiescent Current in Standby Mode

Dropout Voltage Typically 35 mV @ 50mA

Over Current Limitation

NC/FB

EN

–40°C to 125°C Operating Junction

Temperature Range

5-Pin SOT-23 (DBV) Package

description

The TPS770xx family of low-dropout (LDO) voltage regulators offers the benefits of low dropout voltage, ultra

low-power operation, and miniaturized packaging. These regulators feature low dropout voltages and ultra low

quiescent current compared to conventional LDO regulators. Offered in a 5-terminal small outline

integrated-circuit SOT-23 package, the TPS770xx series devices are ideal for micropower operations and

where board space is at a premium.

A combination of new circuit design and process innovation has enabled the usual PNP pass transistor to be

replaced by a PMOS pass element. Because the PMOS pass element behaves as a low-value resistor, the

dropout voltage is very low — typically 35 mV at 50 mA of load current (TPS77050) — and is directly proportional

to the load current. Since the PMOS pass element is a voltage-driven device, the quiescent current is ultra low

(28 µA maximum) and is stable over the entire range of output load current (0 mA to 50 mA).

Intended for use in portable systems such as

laptops and cellular phones, the ultra low-dropout

voltage feature and ultra low-power operation

result in a significant increase in system battery

operating life.

TPS77033

GROUND CURRENT

vs

FREE-AIR TEMPERATURE

22

21

20

19

18

17

16

15

The TPS770xx also features a logic-enabled

sleep mode to shut down the regulator, reducing

V = 4.3 V

I

C

= 4.7 µF

O

quiescent current to 1 µA typical at T = 25°C. The

J

TPS770xx is offered in 1.2-V, 1.5-V, 1.8-V, 2.5-V,

2.7-V, 2.8-V, 3.0-V, 3.3-V, and 5-V fixed-voltage

versions and in a variable version (programmable

over the range of 1.2 V to 5.5 V).

I

= 50 mA

I

O

= 0 mA

O

–60 –40 –20

0

20 40 60 80 100 120 140

T

A

– Free-Air Temperature – °C

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

AVAILABLE OPTIONS

T

J

VOLTAGE

PACKAGE

PART NUMBER

SYMBOL

Variable

1.2V to 5.5V

†

‡

TPS77001DBVT

TPS77001DBVR

PCPI

†

‡

1.2 V

1.5 V

1.8 V

2.5 V

2.7 V

2.8 V

3.0 V

3.3 V

5.0 V

TPS77012DBVT

TPS77015DBVT

TPS77018DBVT

TPS77025DBVT

TPS77027DBVT

TPS77028DBVT

TPS77030DBVT

TPS77033DBVT

TPS77050DBVT

TPS77012DBVR

TPS77015DBVR

TPS77018DBVR

TPS77025DBVR

TPS77027DBVR

TPS77028DBVR

TPS77030DBVR

TPS77033DBVR

TPS77050DBVR

PCQI

PCRI

PCSI

PCTI

PCUI

PCVI

PCWI

PCXI

PCYI

SOT-23

(DBV)

–40°C to 125°C

†

‡

The DBVT indicates tape and reel of 250 parts.

The DBVR indicates tape and reel of 3000 parts.

functional block diagram

TPS77001

OUT

IN

EN

Current Limit

/ Thermal

Protection

V

REF

FB

GND

TPS77012/15/18/25/27/28/30/33/50

OUT

IN

EN

Current Limit

/ Thermal

Protection

V

REF

GND

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

Terminal Functions

TERMINAL

NAME

I/O

DESCRIPTION

NO.

2

GND

EN

Ground

3

I

Enable input

FB

4

Feedback voltage (TPS77001 only)

Input supply voltage

IN

1

NC

OUT

4

No connection (Fixed options only)

Regulated output voltage

5

O

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Input voltage range

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to 13.5 V

Voltage range at EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to V + 0.3 V

I

Voltage on OUT, FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

Peak output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally limited

ESD rating, HBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV

Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See dissipation rating table

Operating virtual junction temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 150°C

J

Storage temperature range, T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C

stg

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to network ground terminal.

DISSIPATION RATING TABLE

T

≤ 25°C

DERATING FACTOR

T

= 70°C

T = 85°C

A

PACKAGE

POWER RATING

ABOVE T = 25°C

POWER RATING POWER RATING

A

Recommended

DBV

350 mW

437 mW

3.5 mW/°C

192 mW

280 mW

140 mW

227 mW

Absolute Maximum

recommended operating conditions

MIN NOM

MAX

10

UNIT

V

Input voltage, V (see Note 2)

2.7

1.2

0

I

Output voltage range, V

5.5

50

V

O

Continuous output current, I (see Note 3)

mA

°C

O

Operating junction temperature, T

–40

125

J

NOTES: 2. To calculate the minimum input voltage for your maximum output current, use the following formula:

V (min) = V (max) + V (max load)

I

O

DO

3. Continuous output current and operating junction temperature are limited by internal protection circuitry, but it is not recommended

that the device operate under conditions beyond those specified in this table for extended periods of time.

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

electrical characteristics over recommended operating free–air temperature range, V = V

+

I

O(typ)

1 V, I = 50 mA, EN = 0V, C = 4.7 µF (unless otherwise noted)

O

PARAMETER

TEST CONDITIONS

1.2 V ≤ V ≤ 5.5 V, T = 25°C

MIN

TYP

MAX

UNIT

V

O

J

TPS77001

1.2 V ≤ V ≤ 5.5 V,

T = –40°C to 125°C 0.97V

J

1.03V

O

T = 25°C,

2.7 V < V < 10 V

IN

1.224

1.5

1.8

2.5

2.7

2.8

3.0

3.3

5.0

J

TPS77012

TPS77015

TPS77018

TPS77025

TPS77027

TPS77028

TPS77030

TPS77033

TPS77050

T = –40°C to 125°C, 2.7 V < V < 10 V

J IN

1.187

1.261

T = 25°C,

J

2.7 V < V < 10 V

IN

T = –40°C to 125°C, 2.7 V < V < 10 V

J IN

1.455

1.746

2.425

2.619

2.716

2.910

3.201

4.850

1.545

1.854

2.575

2.781

2.884

3.090

3.399

5.150

T = 25°C,

J

2.8 V < V < 10 V

IN

T = –40°C to 125°C, 2.8 V < V < 10 V

J IN

T = 25°C,

J

3.5 V < V < 10 V

IN

Output voltage

(10 µA to 50 mA Load)

(See Note 4)

T = –40°C to 125°C, 3.5 V < V < 10 V

J IN

V

T = 25°C,

J

3.7 V < V < 10 V

IN

T = –40°C to 125°C, 3.7 V < V < 10 V

J IN

T = 25°C,

J

3.8 V < V < 10 V

IN

T = –40°C to 125°C, 3.8 V < V < 10 V

J IN

T = 25°C,

J

4.0 V < V < 10 V

IN

T = –40°C to 125°C, 4.0 V < V < 10 V

J IN

T = 25°C,

J

4.3 V < V < 10 V

IN

T = –40°C to 125°C, 4.3 V < V < 10 V

J IN

T = 25°C,

J

6.0 V < V < 10 V

IN

T = –40°C to 125°C, 6.0 V < V < 10 V

J

IN

0 mA < I < 50mA,

EN = 0V,

T = 25°C

J

O

17

Quiescent current (GND current)

(See Note 4)

µA

EN = 0V,

T = –40°C to 125°C

J

I

O

= 50mA,

28

V

+ 1 V < V ≤ 10 V, T = 25°C

0.04

O

I

J

Output voltage line regulation (∆V /V

(See Notes 4 and 5)

O

)

%/V

V

+ 1 V < V ≤ 10 V,

I

0.1

T = –40°C to 125°C

J

EN = 0V,

T = 25°C

J

I

O

= 0 to 50 mA,

Load regulation

8

mV

BW = 300 Hz to 50 kHz,

Output noise voltage

Output current limit

190

µVrms

C

= 10 µF,

T = 25°C

o

J

V

O =

0V,

See Note 4

350

1

750

2

mA

µA

EN = V ,

2.7 < V < 10 V

I

Standby current

T = –40°C to 125°C

J

NOTES: 4. Minimum IN operating voltage is 2.7 V or V (typ) + 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current

O

10 µA, maximum output current 50 mA.

5. If V ≤ 1.8 V then V

imin

= 2.7 V, V = 10 V:

imax

O

V

2.7 V

O

imax

100

Line Reg. (mV)

% V

1000

If V ≥ 2.5 V then V

imin

= V + 1 V, V

imax

= 10 V:

% V

O

V

1 V

imax

O

Line Reg. (mV)

1000

100

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

electrical characteristics over recommended operating free–air temperature range, V = V

+

I

O(typ)

1 V, I = 50 mA, EN = 0V, C = 4.7 µF (unless otherwise noted) (continued)

O

PARAMETER

TEST CONDITIONS

FB = 1.224 V (TPS77001)

2.7 V < V < 10 V

MIN

–1

TYP

MAX

UNIT

µA

V

FB input current

1

High level enable input voltage

Low level enable input voltage

1.7

I

2.7 V < V < 10 V

I

0.9

V

f = 1 kHz,

T = 25°C,

J

C

= 10 µF,

O

Power supply ripple rejection

Input current (EN)

60

0

dB

See Note 4

EN = 0 V

–1

1

µA

EN = V

I

O

I

O

I

O

I

O

I

O

I

O

I

O

I

O

= 50 mA,

= 50 mA

= 50 mA,

= 50 mA

= 50 mA,

= 50 mA

= 50 mA,

= 50 mA

T = 25°C

60

57

48

35

J

TPS77028

TPS77030

TPS77033

TPS77050

T = –40°C to 125°C

J

125

115

100

85

T = 25°C

J

T = –40°C to 125°C

J

Dropout voltage

(See Note 6)

mV

T = 25°C

J

T = –40°C to 125°C

J

T = 25°C

J

T = –40°C to 125°C

J

NOTES: 4. Minimum IN operating voltage is 2.7 V or V (typ) + 1 V, whichever is greater. Maximum IN voltage 10 V, minimum output current

O

10 µA, maximum output current 50 mA.

6. IN voltage equals V (Typ) –100mV; TPS77001 output voltage set to 3.3 V nominal with external resistor divider. TPS77012,

O

TPS77015, TPS77018, TPS77025, and TPS77027 dropout voltage limited by input voltage range limitations.

TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

vs Output current

vs Free-air temperature

vs Frequency

1, 2, 3

4, 5, 6

7

V

Output voltage

O

Ground current

Output spectral noise density

Output impedance

Dropout voltage

8

Z

o

vs Frequency

9

V

DO

vs Free-air temperature

vs Frequency

10

Ripple rejection

11

LDO startup time

12

Line transient response

Load transient response

13, 15

14, 16

17, 19

18, 20

vs Output current

Equivalent series resistance (ESR)

vs Added ceramic capacitance

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77015

TPS77025

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

OUTPUT VOLTAGE

vs

OUTPUT CURRENT

1.498

1.496

1.494

1.492

1.490

1.488

2.498

2.496

2.494

2.492

2.490

2.488

2.486

V = 2.7 V

I

V = 3.5 V

I

C

= 4.7 µF

= 25° C

O

C

= 4.7 µF

= 25° C

O

T

A

T

A

1.486

1.484

2.484

2.482

0

10

20

30

40

50

0

10

20

30

40

50

I – Output Current – mA

O

I

O

– Output Current – mA

Figure 1

Figure 2

TPS77015

TPS77033

OUTPUT VOLTAGE

vs

OUTPUT VOLTAGE

vs

FREE-AIR TEMPERATURE

OUTPUT CURRENT

1.496

1.494

1.492

1.490

1.488

1.486

1.484

3.284

3.282

3.280

3.278

3.276

3.274

V = 4.3 V

I

C

= 4.7 µF

= 25° C

O

T

A

I

= 1 mA

V = 2.7 V

O

I

C

= 4.7 µF

O

I

= 50 mA

O

3.272

3.270

1.482

1.480

–60 –40 –20

0

20 40 60 80 100 120 140

0

10

20

30

40

50

T

A

– Free-Air Temperature – °C

I

O

– Output Current – mA

Figure 3

Figure 4

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77025

TPS77033

OUTPUT VOLTAGE

vs

OUTPUT VOLTAGE

vs

FREE-AIR TEMPERATURE

2.496

2.494

2.492

3.285

3.280

V = 4.3 V

I

C

= 4.7 µF

O

I

O

= 1 mA

I

O

= 1 mA

2.490

2.488

2.486

2.484

3.275

3.270

3.265

I

O

= 50 mA

I

O

= 50 mA

2.482

2.480

2.478

2.476

3.260

3.255

V = 3.5 V

I

C

= 4.7 µF

O

–60 –40 –20

0

20 40 60 80 100 120 140

–60 –40 –20

0

20 40 60 80 100 120 140

T

A

– Free-Air Temperature – °C

T

A

– Free-Air Temperature – °C

Figure 5

Figure 6

TPS77033

GROUND CURRENT

vs

TPS77033

OUTPUT SPECTRAL NOISE DENSITY

vs

FREE-AIR TEMPERATURE

FREQUENCY

2

1.8

1.6

22

21

20

19

18

17

16

15

V = 4.3 V

I

C

= 4.7 µF

O

C

= 10 µF

= 1 mA

O

I

O

C

= 4.7 µF

= 50 mA

O

1.4

1.2

1

I

O

I

= 50 mA

I

O

= 0 mA

O

0.8

C

= 4.7 µF

= 1 mA

O

I

O

0.6

0.4

0.2

0

C

= 10 µF

= 50 mA

O

V = 4.3 V

I

O

100

1k

10k

100k

–60 –40 –20

0

20 40 60 80 100 120 140

T

A

– Free-Air Temperature – °C

f – Frequency – Hz

Figure 7

Figure 8

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77033

DROPOUT VOLTAGE

vs

OUTPUT IMPEDANCE

vs

FREQUENCY

FREE-AIR TEMPERATURE

100

2

1.8

1.6

V = 4.3 V

V = 3.2 V

I

C

= 4.7 µF

C

= 4.7 µF

O

I

O

= 50 mA

1.4

1.2

1

10

0.8

I

O

= 10 mA

I

O

= 1 mA

0.6

0.4

0.2

0

I

O

= 50 mA

1k

1

10

100

10k

100k

1M

–60 –40 –20

0

20 40 60 80 100 120 140

f – Frequency – Hz

T

A

– Free-Air Temperature – °C

Figure 9

Figure 10

TPS77033

RIPPLE REJECTION

vs

LDO STARTUP TIME

FREQUENCY

100

90

80

70

60

50

EN

I

O

= 1 mA

40

30

20

I

O

= 50 mA

10

0

V = 4.3 V

I

V

O

C

= 4.7 µF

O

ESR = 0.3 Ω

–10

10

100

1 k

10 k

100 k

1 M

10 M

0

20 40 60 80 100 120 140 160 180 200

f – Frequency – Hz

t – Time – µs

Figure 11

Figure 12

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77015

LINE TRANSIENT RESPONSE

LOAD TRANSIENT RESPONSE

50

0

10

0

–10

3.7

0

–50

2.7

I

C

= 10 mA

L

V = 2.7 V

I

= 4.7 µF

–100

O

C

= 10 µF

O

ESR = 0.3 Ω

0

20 40 60 80 100 120 140 160 180 200

0

20 40 60 80 100 120 140 160 180 200

t – Time – µs

Figure 13

Figure 14

TPS77033

LINE TRANSIENT RESPONSE

LOAD TRANSIENT RESPONSE

50

0

10

0

–10

5.3

0

–20

–40

4.3

V = 4.3 V

I

C

= 10 mA

L

C

= 4.7 µF

O

ESR = 0.3 Ω

0

20 40 60 80 100 120 140 160 180

0

20 40 60 80 100 120 140 160 180

t – Time – µs

Figure 15

Figure 16

9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

TYPICAL CHARACTERISTICS

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

vs

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

vs

†

OUTPUT CURRENT

ADDED CERAMIC CAPACITANCE

100

10

1

100

V

C

= 4.3 V

= 4.7 µF

V

C

= 4.3 V

= 4.7 µF

O

IN

O

IN

ESR = 0.3 Ω

3.3 V LDO

I = 50 mA

L

Region of Instability

Region of Stability

10

Region of Stability

0.1

1

0

5

10 15 20 25 30 35 40 45 50

0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

1

I

O

– Output Current – mA

Added Ceramic Capacitance – µF

Figure 17

Figure 18

TPS77033

TYPICAL REGIONS OF STABILITY

EQUIVALENT SERIES RESISTANCE (ESR)

vs

TYPICAL REGIONS OF STABILITY

†

EQUIVALENT SERIES RESISTANCE (ESR)

vs

OUTPUT CURRENT

ADDED CERAMIC CAPACITANCE

100

V

C

= 4.3 V

= 10 µF

V

C

= 4.3 V

= 10 µF

O

IN

O

IN

ESR = 0.3 Ω

3.3 V LDO

I = 50 mA

L

Region of Instability

Region of Stability

10

Region of Stability

1

0

5

10 15 20 25 30 35 40 45 50

0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

1

I

O

– Output Current – mA

Added Ceramic Capacitance – µF

Figure 19

Figure 20

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

The TPS770xx family of low-dropout (LDO) regulators have been optimized for use in battery-operated

equipment. They feature extremely low dropout voltages, low quiescent current (17 µA nominally), and enable

inputs to reduce supply currents to less than 1 µA when the regulators are turned off.

device operation

The TPS770xx uses a PMOS pass element to dramatically reduce both dropout voltage and supply current over

more conventional PNP-pass-element LDO designs. The PMOS pass element is a voltage-controlled device

and, unlike a PNP transistor, it does not require increased drive current as output current increases. Supply

current in the TPS770xx is essentially constant from no load to maximum load.

Current limiting and thermal protection prevent damage by excessive output current and/or power dissipation.

The device switches into a constant-current mode at approximately 350 mA; further load reduces the output

voltage instead of increasing the output current. The thermal protection shuts the regulator off if the junction

temperature rises above approximately 165°C. Recovery is automatic when the junction temperature drops

approximately 25°C below the high temperature trip point. The PMOS pass element includes a back gate diode

that conducts reverse current when the input voltage level drops below the output voltage level.

A voltage of 1.7 V or greater on the EN input will disable the TPS770xx internal circuitry, reducing the supply

current to 1µA. A voltage of less than 0.9 V on the EN input will enable the TPS770xx and will enable normal

operation to resume. The EN input does not include any deliberate hysteresis, and it exhibits an actual switching

threshold of approximately 1.5 V.

A typical application circuit is shown in Figure 21.

†

TPS770xx

1

3

V

IN

I

4

5

NC/FB

OUT

V

O

C1

1 µF

EN

+

4.7 µF

GND

ESR = 0.2 Ω

2

†

TPS77012, TPS77015, TPS77018, TPS77025, TPS77027,

TPS77028,TPS77030,TPS77033,TPS77050(fixed-voltageoptions).

Figure 21. Typical Application Circuit

11

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

external capacitor requirements

Although not required, a 0.047-µF or larger ceramic input bypass capacitor, connected between IN and GND

and located close to the TPS770xx, is recommended to improve transient response and noise rejection. A

higher-value electrolytic input capacitor may be necessary if large, fast-rise-time load transients are anticipated

and the device is located several inches from the power source.

Like all low dropout regulators, the TPS770xx requires an output capacitor connected between OUT and GND

to stabilize the internal control loop. The minimum recommended capacitance is 4.7 µF. The ESR (equivalent

series resistance) of the capacitor should be between 0.2Ω and 10 Ω. toensurestability. Capacitorvalueslarger

than 4.7 µF are acceptable, and allow the use of smaller ESR values. Capacitances less than 4.7 µF are not

recommended because they require careful selection of ESR to ensure stability. Solid tantalum electrolytic,

aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements

described above. Most of the commercially available 4.7 µF surface-mount solid tantalum capacitors, including

devices from Sprague, Kemet, and Nichico, meet the ESR requirements stated above. Multilayer ceramic

capacitors may have very small equivalent series resistances and may thus require the addition of a low value

series resistor to ensure stability.

CAPACITOR SELECTION

†

PART NO.

T494B475K016AS

195D106x0016x2T

695D106x003562T

TPSC475K035R0600

MFR.

KEMET

SPRAGUE

AVX

VALUE

4.7 µF

10 µF

MAX ESR

SIZE (H × L × W)

1.9 × 3.5 × 2.8

1.3 × 7.0 × 2.7

2.5 × 7.6 × 2.5

2.6 × 6.0 × 3.2

1.5 Ω

10 µF

1.3 Ω

4.7 µF

0.6 Ω

†

Size is in mm. ESR is maximum resistance in Ohms at 100 kHz and T = 25°C. Contact manufacturer for minimum ESR values.

A

12

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

output voltage programming

The output voltage of the TPS77001 adjustable regulator is programmed using an external resistor divider as

shown in Figure 22. The output voltage is calculated using:

R1

R2

(1)

V

1

O

ref

where

V

= 1.224 V typ (the internal reference voltage)

ref

Resistors R1 and R2 should be chosen for approximately 7-µA divider current. Lower value resistors can be

used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage

currents at FB increase the output voltage error. The recommended design procedure is to choose

R2 = 169 kΩ to set the divider current at 7 µA and then calculate R1 using:

V

O

R1

1

R2

(2)

V

ref

OUTPUT VOLTAGE

PROGRAMMING GUIDE

TPS77001

DIVIDER RESISTANCE

OUTPUT

VOLTAGE

(V)

‡

(kΩ)

1

V

I

IN

R1

R2

1 µF

2.5

3.3

3.6

4.0

5.0

174

287

324

383

523

169

5

V

OUT

FB

O

≥1.7 V

3

R1

R2

EN

4

≤0.9 V

4.7 µF

GND

2

‡

1% values shown.

ESR = 0.2 Ω

Figure 22. TPS77001 Adjustable LDO Regulator Programming

13

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

APPLICATION INFORMATION

power dissipation and junction temperature

Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature

should be restricted to 125°C under normal operating conditions. This restriction limits the power dissipation

the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits,

calculate the maximum allowable dissipation, P

, and the actual dissipation, P , which must be less than

D(max)

D

or equal to P

.

D(max)

The maximum-power-dissipation limit is determined using the following equation:

T max

J

T

A

P

D(max)

R

JA

Where

T max is the maximum allowable junction temperature

J

R

is the thermal resistance junction-to-ambient for the package, i.e., 285°C/W for the 5-terminal

θJA

SOT23.

T is the ambient temperature.

A

The regulator dissipation is calculated using:

P

V

I

D

I

O

Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the

thermal protection circuit.

regulator protection

The TPS770xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input

voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the

input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might

be appropriate.

The TPS770xx features internal current limiting and thermal protection. During normal operation, the TPS770xx

limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back

linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure,

care should be taken not to exceed the power dissipation ratings of the package. If the temperature of thedevice

exceeds approximately 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to

below approximately 140°C, regulator operation resumes.

14

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS77001, TPS77012, TPS77015, TPS77018, TPS77025

TPS77027, TPS77028, TPS77030, TPS77033, TPS77050

ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999

MECHANICAL DATA

DBV (R-PDSO-G5)

PLASTIC SMALL-OUTLINE PACKAGE

0,40

M

0,25

0,95

5

0,20

4

0,15 NOM

1,80

1,50

3,00

2,50

1

3

Gage Plane

3,10

2,70

0,25

0°–8°

0,55

0,35

Seating Plane

0,10

1,30

1,00

0,05 MIN

4073253-4/B 10/97

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. Body dimensions include mold flash or protrusion.

15

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IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO

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In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

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