LT1144芯片引脚定义引脚图及功能IC贸易商引脚图技术参数-中国IC网-芯三七

当前位置：IC37首页_>L字母起始型号索引_>L字母起始型号索引第416页更新时间：2024-12-03 18:10:53

产品型号LT1144的概述

LT1144芯片概述 LT1144是一款由Linear Technology（现为Analog Devices的一部分）公司推出的高性能运算放大器。该芯片以其低噪声、高带宽和低失真特性而闻名，广泛应用于音频、医疗仪器及信号处理等领域。LT1144特别适合在要求高精度和低失真的应用中发挥重要作用。 LT1144详细参数 LT1144芯片的性能参数包括但不限于以下几个方面： 1. 供电电压：LT1144支持的供电电压范围为±2V至±18V，适合多种电源配置。 2. 增益带宽积：该运算放大器的增益带宽积为10MHz，这使其在频率较高的信号处理中表现出色。 3. 输入失调电压：LT1144的输入失调电压仅为300μV，确保了在高精度应用中的可靠性。 4. 输入偏置电流：输入偏置电流为50nA，这一特性减小了在高阻抗电路中对电流的影响。 5. 输出摆幅：LT1144的输出摆幅大约为±13V...

产品型号LT1144的Datasheet PDF文件预览

LTC1144

Switched-Capacitor

Wide Input Range

Voltage Converter

with Shutdown

DESCRIPTIO

EATURE

■

Wide Operating Supply Voltage Range: 2V to 18V

Boost Pin (Pin 1) for Higher Switching Frequency

Simple Conversion of 15V to –15V Supply

Low Output Resistance: 120Ω Maximum

Power Shutdown to 8µA with SHDN Pin

Open Circuit Voltage Conversion Efficiency:

99.9% Typical

The LTC1144 is a monolithic CMOS switched-capacitor

voltage converter. It performs supply voltage conversion

frompositivetonegativefromaninputrangeof2Vto18V,

resulting in complementary output voltages of –2V to

–18V. Only two noncritical external capacitors are needed

for the charge pump and charge reservoir functions.

The converter has an internal oscillator that can be

overdriven by an external clock or slowed down when

connected to a capacitor. The oscillator runs at a 10kHz

frequency when unloaded. A higher frequency outside the

audio band can also be obtained if the Boost Pin is tied to

V⁺. The SHDN pin reduces supply current to 8µA and can

be used to save power when the converter is not in use.

■

Power Conversion Efficiency: 93% Typical

Easy to Use

O U

PPLICATI

■

Conversion of 15V to ±15V Supplies

Inexpensive Negative Supplies

Data Acquisition Systems

The LTC1144 contains an internal oscillator, divide-by-

two, voltage level shifter, and four power MOSFETs. A

special logic circuit will prevent the power N-channel

switch substrate from turning on.

High Voltage Upgrade to LTC1044 or 7660

Voltage Division and Multiplications

Automotive Applications

Battery Systems with Wall Adapter/Charger

TYPICAL APPLICATI

Generating –15V from 15V

Output Voltage vs Load Current, V⁺= 15V

–15

LTC1144

= 56Ω

OUT

= 25°C

15V INPUT

BOOST

–14

–13

–12

–11

–10

CAP

OSC

10µF

GND

SHDN

–

–15V OUTPUT

CAP

OUT

10µF

1144 TA01

LOAD CURRENT (mA)

1144 TA02

LTC1144

W W W

ABSOLUTE AXI U RATI GS

PACKAGE RDER I FOR ATIO

(Note 1)

TOP VIEW

ORDER PART

Supply Voltage (V⁺) (Transient) .............................. 20V

Supply Voltage (V⁺) (Operating)............................. 18V

Input Voltage on Pins 1, 6, 7

BOOST

NUMBER

CAP

OSC

SHDN

GND

LTC1144CN8

LTC1144IN8

(Note 2) ............................ –0.3V < V_IN< (V⁺) + 0.3V

Output Short-Circuit Duration

–

CAP

OUT

N8 PACKAGE

8-LEAD PLASTIC DIP

V⁺≤ 10V .................................................... Indefinite

V⁺≤ 15V ........................................................ 30 sec

V⁺≤ 20V ............................................. Not Protected

Power Dissipation............................................. 500mW

Operating Temperature Range

LTC1144C................................................ 0°C to 70°C

LTC1144I............................................ –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

= 110°C, θ = 100°C/W

JMAX

TOP VIEW

LTC1144CS8

LTC1144IS8

BOOST

CAP

OSC

SHDN

GND

S8 PART MARKING

–

CAP

OUT

S8 PACKAGE

8-LEAD PLASTIC SOIC

= 110°C, θ = 130°C/W

1144

1144I

JMAX

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

V⁺= 15V, C_OSC= 0pF, T_A= 25°C, Test Circuit Figure 1, unless otherwise noted.

LTC1144C

TYP

LTC1144I

SYMBOL PARAMETER

Supply Voltage Range

Supply Current

CONDITIONS

R = 10k

MIN

MAX

MIN

TYP

MAX

UNITS

●

R =

OSC

∞

, Pins 1, 6 No Connection,

1.1

1.3

0.03

1.1

1.6

= 10kHz

●

SHDN = 0V, R =

No Connection

∞

, Pins 1, 7

0.008

0.008 0.035

V = 5V, R =

∞

, Pins 1, 6

OSC

0.10

0.13

0.10

0.15

No Connection, f

= 4kHz

●

V = 5V, SHDN = 0V, R =

∞,

0.002 0.015

0.002 0.018

Pins 1, 7 No Connection

OUT

Output Resistance

V = 15V, I = 20mA at 10kHz

100

120

100

140

Ω

●

V = 5V, I = 3mA at 4kHz

250

300

Ω

Oscillator Frequency

V = 15V (Note 3)

kHz

OSC

V = 5V

Power Efficiency

Voltage Conversion Efficiency

R = 2k at 10kHz

●

97.0

99.9

R =

∞

97.0 99.9

Oscillator Sink or Source Current V = 5V (V

= 0V to 5V)

OSC

0.5

µA

OSC

V = 15V (V

= 0V to 15V)

The

● denotes specifications which apply over the full operating

inputs from sources operating from external supplies be applied prior to

power-up of the LTC1144.

temperature range; all other limits and typicals at T = 25°C.

Note 1: Absolute maximum ratings are those values beyond which the life

Note 3: f

is tested with C

= 100pF to minimize the effects of test

OSC

of a device may be impaired.

Note 2: Connecting any input terminal to voltages greater than V or less

fixture capacitance loading. The 0pF frequency is correlated to this 100pF

test point, and is intended to simulate the capacitance at pin 7 when the

device is plugged into a test socket and no external capacitor is used.

than ground may cause destructive latch-up. It is recommended that no

LTC1144

TYPICAL PERFORMANCE CHARACTERISTICS

Output Resistance

vs Supply Voltage

Oscillator Frequency

vs Supply Voltage

Output Resistance vs Temperature

140

120

100

1000

100

300

250

200

150

100

= 25°C

OSC

= 0

BOOST = V

= 5V

= 3mA

BOOST = OPEN OR GROUND

= 15V

= 20mA

10 12 14 16 18

TEMPERATURE (°C)

100 125

–55 –25

10 12

SUPPLY VOLTAGE (V)

14 16 18

SUPPLY VOLTAGE (V)

LTC1144 • TPC01

LTC1144 • TPC02

LTC1144 • TPC03

Oscillator Frequency as a

Function of C_OSC

Oscillator Frequency

vs Temperature

Output Voltage vs Load Current

–5

1000

100

1000

100

= 25°C

= 15V

= 25°C

= 15V

= 25°C

= 15V

C1 = C2 = 10µF

BOOST = OPEN

BOOST = V

BOOST = OPEN OR GROUND

–10

–15

BOOST = OPEN OR GROUND

0.1

0.01

= 56Ω

OUT

100

1000

–55 –25

75 100 125

10000

(pF)

LOAD CURRENT (mA)

TEMPERATURE (°C)

EXTERNAL CAPACITANCE (PIN 7 TO GND), C

OSC

LTC1144 • TPC04

LTC1144 • TPC05

LTC1144 • TPC06

Power Conversion Efficiency and

Supply Current vs Load Current

Supply Current as a Function of

Oscillator Frequency

Output Voltage vs Load Current

–1

–2

–3

100

10000

1000

100

= 25°C

= 5V

= 25°C

EFF

C1 = C2 = 10µF

BOOST = OPEN

= 15V

= 5V

= 25°C

= 15V

= 90Ω

OUT

–4

–5

C1 = C2 = 10µF

BOOST = OPEN

(SEE TEST CIRCUIT)

LOAD CURRENT (mA)

OSCILLATOR FREQUENCY (kHz)

0.01

100

0.1

LOAD CURRENT (mA)

LTC1144 • TPC07

LTC1144 • TPC09

LTC1144 • TPC08

LTC1144

TYPICAL PERFORMANCE CHARACTERISTICS

Power Conversion Efficiency and

Supply Current vs Load Current

Power Conversion Efficiency

vs Oscillator Frequency

Output Resistance

vs Oscillator Frequency

100

3000

2000

1000

= 25°C, V = 15V

= 25°C

= 15V

BOOST = OPEN

100µF

EFF

10µF

1µF

= 3mA

1µF

= 25°C

= 5V

1µF

C1 = C2 = 10µF

BOOST = OPEN

100µF

= 20mA

(SEE TEST CIRCUIT)

0.1

100

0.1

100

OSCILLATOR FREQUENCY (kHz)

LOAD CURRENT (mA)

LTC1144 • TPC11

LTC1144 • TPC12

LTC1144 • TPC10

Ripple Voltage vs Load Current

Output Voltage vs Load Current

1500

1000

500

–5

–1

–2

–3

–4

–5

= 5V

= 15V

= 5V

= 25°C

C1 = C2

BOOST = 5V

BOOST = 15V

BOOST = OPEN

BOOST = 5V

BOOST = OPEN

1µF

BOOST =

OPEN

0.1µF 10µF

0.1µF

1µF

0.1µF

10µF

1µF

10µF

–10

0.1µF

1µF

10µF

–15

0.01

0.1

100

0.001

0.01

0.1

100

0.001

0.01

0.1

100

LOAD CURRENT (mA)

LTC1144 • G14

LTC1144 • TPC15

LTC1144 • TPC13

PI FU CTIO S

Boost (Pin 1): This pin will raise the oscillator frequency

SHDN(Pin6):ShutdownPin.TietoV⁺pinorleavefloating

for normal operation. Tie to ground when in shutdown

mode.

by a factor of 10 if tied high.

CAP⁺(Pin 2): Positive Terminal for Pump Capacitor.

OSC(Pin7):OscillatorInputPin.Thispincanbeoverdriven

with an external clock or can be slowed down by connect-

ing an external capacitor between this pin and ground.

V⁺(Pin 8): Input Voltage.

GND (Pin 3): Ground Reference.

CAP^–(Pin 4): Negative Terminal for Pump Capacitor.

V_OUT(Pin 5): Output of the Converter.

LTC1144

TEST CIRCUITS

15V

EXTERNAL

OSCILLATOR

LTC1144

10µF

OUT

OSC

10µF

1144 F01

Figure 1.

O U

PPLICATI

S I FOR ATIO

Theory of Operation

EQUIV

To understand the theory of operation of the LTC1144, a

review of a basic switched-capacitor building block is

helpful.

f × C1

InFigure2,whentheswitchisintheleftposition,capacitor

C1 will charge to voltage V1. The total charge on C1 will be

q1 = C1V1. The switch then moves to the right, discharg-

ing C1 to voltage V2. After this discharge time, the charge

on C1 is q2 = C1V2. Note that charge has been transferred

fromthesourceV1totheoutputV2. Theamountofcharge

transferred is:

1144 F03

EQUIV

Figure 3. Switched-Capacitor Equivalent Circuit

Examination of Figure 4 shows that the LTC1144 has the

same switching action as the basic switched-capacitor

building block. With the addition of finite switch on-

resistance and output voltage ripple, the simple theory,

although not exact, provides an intuitive feel for how the

device works.

∆q = q1 – q2 = C1(V1 – V2)

For example, if you examine power conversion efficiency

as a function of frequency (see Figure 5), this simple

theory will explain how the LTC1144 behaves. The loss,

1144 F02

Figure 2. Switched-Capacitor Building Block

(8)

SW1

SW2

If the switch is cycled f times per second, the charge

transfer per unit time (i.e., current) is:

CAP

(2)

BOOST

I = f × ∆q = f × C1(V1 – V2)

10X

(1)

OSC

Rewriting in terms of voltage and impedance equivalence,

–

OUT

(5)

CAP

(4)

OSC

(7)

V1− V2 V1− V2

I =

R_EQUIV

GND

(3)

SHDN

(6)

f ×C1

1144 F04

A new variable R_EQUIVhas been defined such that R_EQUIV

= 1/(f × C1). Thus, the equivalent circuit for the switched-

capacitor network is as shown in Figure 3.

Figure 4. LTC1144 Switched-Capacitor

Voltage Converter Block Diagram

LTC1144

PPLICATI

and hence the efficiency, is set by the output impedance.

As frequency is decreased, the output impedance will

eventually be dominated by the 1/(f × C1) term and power

efficiency will drop.

O U

S I FOR ATIO

BOOST

(1)

Note also that power efficiency decreases as frequency

goes up. This is caused by internal switching losses which

occur due to some finite charge being lost on each

switching cycle. This charge loss per unit cycle, when

multiplied by the switching frequency, becomes a current

loss. At high frequency this loss becomes significant and

the power efficiency starts to decrease.

SCHMITT

TRIGGER

OSC

(7)

≈20pF

GND

(3)

1144 F06

100

600

500

400

300

200

100

= 15V, C1 = C2 = 10µF

= 20mA, T = 25°C

Figure 6. Oscillator

POWER

CONVERSION

EFFICIENCY

REQUIRED FOR

TTL LOGIC

100k

OSC INPUT

LTC1144

OUTPUT

–(V )

RESISTANCE

1144 F07

0.1

100

OSCILLATOR FREQUENCY (kHz)

1144 F05

Figure 7. External Clocking

Figure 5. Power Conversion Efficiency and Output

Resistance vs Oscillator Frequency

nal capacitance on pin 7 allows user selection of the

frequency over a wide range.

SHDN (Pin 6)

Driving the LTC1144 from an external frequency source

can be easily achieved by driving pin 7 and leaving the

boost pin open as shown in Figure 7. The output current

from pin 7 is small, typically 4µA, so a logic gate is capable

of driving this current. The choice of using a CMOS logic

gate is best because it can operate over a wide supply

voltage range (3V to 15V) and has enough voltage swing

to drive the internal Schmitt trigger shown in Figure 6. For

5V applications, a TTL logic gate can be used by simply

adding an external pull-up resistor (see Figure 7).

The LTC1144 has a SHDN pin that will disable the internal

oscillatorwhenitispulledlow.Thesupplycurrentwillalso

drop to 8µA.

OSC (Pin 7) and Boost (Pin 1)

The switching frequency can be raised, lowered or driven

from an external source. Figure 6 shows a functional

diagram of the oscillator circuit.

By connecting the boost pin (pin 1) to V⁺, the charge and

discharge current is increased, and hence the frequency is

increased by approximately 10 times. Increasing the fre-

quency will decrease output impedance and ripple for

higher load currents.

Capacitor Selection

External capacitors C1 and C2 are not critical. Matching is

not required, nor do they have to be high quality or tight

tolerance.Aluminumortantalumelectrolyticsareexcellent

choices, with cost and size being the only consideration.

Loading pin 7 with more capacitance will lower the fre-

quency. Using the boost (pin1) in conjunction with exter-

LTC1144

TYPICAL APPLICATI S

Negative Voltage Converter

2V TO 18V

Figure 8 shows a typical connection which will provide a

negative supply from an available positive supply. This

circuit operates over full temperature and power supply

ranges without the need of any external diodes.

1N4148

LTC1144

1N4148

= 2(V – 1)

OUT

10µF

1144 F09

The output voltage (pin 5) characteristics of the circuit are

those of a nearly ideal voltage source in series with a 56Ω

resistor. The 56Ω output impedance is composed of two

terms: 1) the equivalent switched capacitor resistance

(see Theory of Operation), and 2) a term related to the on-

resistance of the MOS switches.

Figure 9. Voltage Doubler

Ultra-Precision Voltage Divider

Anultra-precisionvoltagedividerisshowninFigure10.To

achieve the 0.0002% accuracy indicated, the load current

should be kept below 100nA. However, with a slight loss

in accuracy, the load current can be increased.

2V TO 18V

4V TO 36V

LTC1144

10µF

= –V

OUT

10µF

LTC1144

10µF

1144 F08

MIN

≤ T ≤ T

A MAX

V+

±0.002%

10µF

≤ T ≤ T

Figure 8. Negative Voltage Converter

MIN

MAX

≤ 100nA

1144 F10

Atanoscillatorfrequencyof10kHzandC1=10µF, thefirst

term is:

Figure 10. Ultra-Precision Voltage Divider

Battery Splitter

R_EQUIV

= 20Ω

5 ×10³×10 ×10⁻⁶

/2 ×C1

(

)

A common need in many systems is to obtain (+) and (–

)

OSC

supplies from a single battery or single power supply

system. Where current requirements are small, the circuit

shown in Figure 11 is a simple solution. It provides

symmetrical ± output voltages, both equal to one half the

input voltage. The output voltages are both referenced to

pin 3 (output common).

Notice that the above equation for R_EQUIVis not a capaci-

tive reactance equation (X_C= 1/ωC) and does not contain

a 2π term.

The exact expression for output impedance is extremely

complex, butthedominanteffectofthecapacitorisclearly

shown in Figure 5. For C1 = C2 = 10µF, the output

impedance goes from 56Ω at f_OSC= 10kHz to 250Ω at

f_OSC=1kHz.Asthe1/(f×C)termbecomeslargecompared

to the switch on-resistance term, the output resistance is

determined by 1/(f × C) only.

V /2

LTC1144

10µF

18V

–V /2

–9V

Voltage Doubling

10µF

OUTPUT

COMMON

Figure 9 shows a two-diode capacitive voltage doubler.

With a 15V input, the output is 29.45V with no load and

28.18V with a 10mA load.

1144 F11

Figure 11. Battery Splitter

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

LTC1144

TYPICAL APPLICATI S

Regulated –5V Output Voltage

Figure 12 shows a regulated –5V output with a 9V input.

With a 0mA to 5mA load current, the R_OUTis below 20Ω.

LTC1144

2N2369

1µF

36k

Paralleling for Lower Output Resistance

300k

Additional flexibility of the LTC1144 is shown in Figure 13.

TwoLTC1144sareconnectedinparalleltoprovidealower

effective output resistance. However, if the output resis-

tance is dominated by 1/(f × C1), increasing the capacitor

size (C1) or increasing the frequency will be of more

benefit than the paralleling circuit shown.

–5V

100µF

1144 F12

Figure 12. A Regulated –5V Supply

LTC1144

10µF

= –(V )

OUT

20µF

1/4 CD4077*

* THE EXCLUSIVE NOR GATE

SYNCHRONIZES BOTH LTC1144s

TO MINIMIZE RIPPLE

1144 F13

Figure 13. Paralleling for Lower Output Resistance

PACKAGE DESCRIPTION ^{Dimemsions in inches (millimeters) unless otherwise noted.}

0.400

(10.160)

MAX

0.130 ± 0.005

0.300 – 0.320

0.045 – 0.065

(3.302 ± 0.127)

(1.143 – 1.651)

(7.620 – 8.128)

N8 Package

8-Lead Plastic DIP

0.065

(1.651)

TYP

0.250 ± 0.010

(6.350 ± 0.254)

0.009 – 0.015

0.125

(0.229 – 0.381)

0.020

(0.508)

MIN

(3.175)

MIN

+0.025

0.045 ± 0.015

(1.143 ± 0.381)

0.325

–0.015

+0.635

8.255

(

)

–0.381

0.100 ± 0.010

(2.540 ± 0.254)

0.018 ± 0.003

(0.457 ± 0.076)

0.189 – 0.197

(4.801 – 5.004)

0.010 – 0.020

(0.254 – 0.508)

× 45°

0.004 – 0.010

(0.101 – 0.254)

0.053 – 0.069

(1.346 – 1.752)

0.008 – 0.010

(0.203 – 0.254)

S8 Package

8-Lead Plastic SOIC

0°– 8° TYP

0.150 – 0.157

(3.810 – 3.988)

0.228 – 0.244

(5.791 – 6.197)

0.016 – 0.050

0.406 – 1.270

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).

LT/GP 0494 10K • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

●

(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977

LINEAR TECHNOLOGY CORPORATION 1994

LT1144相关文章

配单直通车

柒号芯城电子商务（深圳）有限公司服务专线: 18922803401 在线联系:

QQ：2881677436 复制

QQ：2881620402 复制

北京元坤伟业科技有限公司服务专线: 010-62104931621064316210489162104791 在线联系:

QQ：857273081 复制

QQ：1594462451 复制

深圳市中利达电子科技有限公司服务专线: 0755-13686833545 在线联系:

QQ：1902134819 复制

QQ：2881689472 复制

深圳市芯福林电子有限公司服务专线: 13418564337 在线联系:

QQ：2881495808 复制

QQ：308365177 复制

首天国际（深圳）科技有限公司服务专线: 0755-82807802/82807803 在线联系:

QQ：528164397 复制

QQ：1318502189 复制

LT1150CN8#PBF产品参数

型号:	LT1150CN8#PBF
是否无铅：	不含铅
是否Rohs认证：	符合
生命周期：	Active
零件包装代码：	DIP
包装说明：	DIP,
针数：	8
Reach Compliance Code：	compliant
风险等级：	5.8
放大器类型：	OPERATIONAL AMPLIFIER
最大平均偏置电流 (IIB)：	0.001 µA
标称共模抑制比：	130 dB
最大输入失调电压：	10 µV
JESD-30 代码：	R-PDIP-T8
JESD-609代码：	e3
负供电电压上限：	-16 V
标称负供电电压 (Vsup)：	-15 V
功能数量：	1
端子数量：	8
最高工作温度：	85 °C
最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP
封装形状：	RECTANGULAR
封装形式：	IN-LINE
峰值回流温度（摄氏度）：	250
认证状态：	Not Qualified
标称压摆率：	3 V/us
供电电压上限：	16 V
标称供电电压 (Vsup)：	15 V
表面贴装：	NO
技术：	CMOS
温度等级：	INDUSTRIAL
端子面层：	MATTE TIN
端子形式：	THROUGH-HOLE
端子节距：	2.54 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	40
标称均一增益带宽：	2500 kHz
宽度：	7.62 mm
Base Number Matches：	1

电子百科

产品导航

产品型号LT1144的概述

产品型号LT1144的Datasheet PDF文件预览

LT1144相关产品

LT1144相关文章

IC37:专业IC行业平台