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产品型号MIC4680-3.3BM的概述

芯片 MIC4680-3.3BM 的概述 MIC4680-3.3BM 是由微芯科技（Micrel Inc.）推出的一款功率管理集成电路，主要用于提供稳定的3.3V电压输出。作为一种线性稳压器，MIC4680-3.3BM 表现出色，尤其是在要求宁静和效率的应用场合。该芯片可用于多种设备的电源管理电路，如便携式设备、消费电子、网络设备以及各种嵌入式系统。它的高性能和高稳定性使其成为设计工程师的重要选择。芯片 MIC4680-3.3BM 的详细参数 MIC4680-3.3BM 的主要参数包括： - 输入电压范围：该芯片的输入电压范围广泛，通常可介于 4.5V 到 18V 之间。这种高输入电压的适应性使其能够与多种电源配置兼容。 - 输出电压：MIC4680-3.3BM 的输出电压为3.3V，非常适合数字电路和逻辑电路供电。 - 输出电流：该芯片能够提供高达 1A 的输出电流，适合各种...

产品型号MIC4680-3.3BM的Datasheet PDF文件预览

MIC4680

Micrel

MIC4680

1A 200kHz SuperSwitcher™ Buck Regulator

Final Information

General Description

Features

The MIC4680 SuperSwitcher™ is an easy-to-use fixed or

adjustable output voltage step-down (buck) switch-mode

voltage regulator. The 200kHz MIC4680 achieves up to 1.3A

of continuous output current over a wide input range in a

8-lead SOP (small outline package).

• SO-8 package with up to 1.3A output current

• All surface mount solution

• Only 4 external components required

• Fixed 200kHz operation

• 3.3V, 5V, and adjustable output versions

• Internally compensated with fast transient response

• Wide 4V to 34V operating input voltage range

• Less than 2µA typical shutdown-mode current

• Up to 90% efficiency

The MIC4680 is available in 3.3V and 5V fixed output ver-

sions or adjustable output down to 1.25V.

The MIC4680 has an input voltage range of 4V to 34V, with

excellent line, load, and transient response. The regulator

performs cycle-by-cycle current limiting and thermal shut-

down for protection under fault conditions. In shutdown

mode, the regulator draws less than 2µA of standby current.

• Thermal shutdown

• Overcurrent protection

Applications

The MIC4680 SuperSwitcher™ regulator requires a mini-

mum number of external components and can operate using

a standard series of inductors and capacitors. Frequency

compensation is provided internally for fast transient re-

sponse and ease of use.

• Simple 1A high-efficiency step-down (buck) regulator

• Replacement of TO-220 and TO-263 designs

• Efficient preregulator (5V to 2.5V, 12V to 3.3V, etc.)

• On-card switching regulators

• Positive-to-negative converter (inverting buck-boost)

• Simple battery charger

• Negative boost converter

The MIC4680 is available in the 8-lead SOP with a

–40°C to +125°C junction temperature range.

• Higher output current regulator using external FET

Typical Applications

MIC4680-3.3BM

+6V to +34V

3.3V/1A

15µF

68µH

220µF

16V

35V

SHUTDOWN

ENABLE

SHDN

GND

B260A or

SS26

Power

SOP-8

5–8

Fixed Regulator Circuit

MIC4680BM

+5V to +34V

2.5V/1A

15µF

35V

68µH

220µF

16V

3.01k

SHUTDOWN

ENABLE

SHDN

2.94k

GND

5–8

B260A or

SS26

Power

SOP-8

Adjustable Regulator Circuit

SuperSwitcher is a trademark of Micrel, Inc.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

June 2000

MIC4680

Micrel

Ordering Information

Part Number

Voltage

Adjustable

3.3V

Junction Temp. Range

–40°C to +125°C

Package

8-lead SOP

MIC4680BM

MIC4680-3.3BM

MIC4680-5.0BM

–40°C to +125°C

5.0V

–40°C to +125°C

Pin Configuration

SHDN

GND

SOP-8 (M)

Pin Description

Pin Number

Pin Name

Pin Function

SHDN

Shutdown (Input): Logic low enables regulator. Logic high (>1.6V) shuts

down regulator.

VIN

Supply Voltage (Input): Unregulated +4V to +34V supply voltage.

Switch (Output): Emitter of NPN output switch. Connect to external storage

inductor and Shottky diode.

Feedback (Input): Connect to output on fixed output voltage versions, or to

1.23V-tap of voltage-divider network for adjustable version.

5–8

GND

Ground

MIC4680

June 2000

MIC4680

Micrel

Absolute Maximum Ratings (Note 1)

Operating Ratings (Note 2)

Supply Voltage (V ), Note 3 ......................................+38V

Supply Voltage (V ), Note 4 .......................... +4V to +34V

Shutdown Voltage (V

) .......................... –0.3V to +38V

Junction Temperature (T ) ...................................... +125°C

SHDN

Steady-State Output Switch Voltage (V ) ..................–1V

Package Thermal Resistance (θ ), Note 6............63°C/W

Feedback Voltage [Adjustable] (V ) ..........................+12V

Storage Temperature (T ) ....................... –65°C to +150°C

ESD, Note 5

Electrical Characteristics

V_IN= 12V; I_LOAD= 500mA; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +125°C, Note 7; unless noted.

Parameter

Condition

Min

Typ

Max

Units

MIC4680 [Adjustable]

Feedback Voltage

(±1%)

(±2%)

1.217 1.230 1.243

1.205 1.255

8V ≤ V_IN≤ 34V, 0.1A ≤ I_LOAD≤ 1A, V_OUT= 5V

1.193 1.230 1.267

1.180

1.280

Maximum Duty Cycle

V_FB= 1.0V

Output Leakage Current

V_IN= 34V, V_SHDN= 5V, V_SW= 0V

V_IN= 34V, V_SHDN= 5V, V_SW= –1V

V_FB= 1.5V

500

µA

Quiescent Current

MIC4680-3.3

Output Voltage

(±1%)

(±3%)

3.266

3.201

3.3

3.333

3.399

6V ≤ V_IN≤ 34V, 0.1A ≤ I_LOAD≤ 1A

3.168

3.135

3.432

3.465

Maximum Duty Cycle

V_FB= 2.5V

Output Leakage Current

V_IN= 34V, V_SHDN= 5V, V_SW= 0V

V_IN= 34V, V_SHDN= 5V, V_SW= –1V

V_FB= 4.0V

500

µA

Quiescent Current

MIC4680-5.0

Output Voltage

(±1%)

(±3%)

4.950

4.85

5.0

5.05

5.15

8V ≤ V_IN≤ 34V, 0.1A ≤ I_LOAD≤ 1A

4.800

4.750

5.200

5.250

Maximum Duty Cycle

V_FB= 4.0V

Output Leakage Current

V_IN= 34V, V_SHDN= 5V, V_SW= 0V

V_IN= 34V, V_SHDN= 5V, V_SW= –1V

V_FB= 6.0V

500

µA

Quiescent Current

June 2000

MIC4680

Micrel

Parameter

Condition

Min

Typ

Max

Units

MIC4680/-3.3/-5.0

Frequency Fold Back

Oscillator Frequency

Saturation Voltage

200

1.4

100

220

1.8

kHz

180

_OUT= 1A

Short Circuit Current Limit

Standby Quiescent Current

V_FB= 0V, see Test Circuit

V_SHDN= V_IN

1.3

1.8

1.5

2.5

µA

V_SHDN= 5V (regulator off)

regulator off

100

Shutdown Input Logic Level

Shutdown Input Current

Thermal Shutdown

1.6

regulator on

1.0

0.8

V_SHDN= 5V (regulator off)

V_SHDN= 0V (regulator on)

–10

–0.5

–1.5

160

µA

°C

Note 1. Exceeding the absolute maximum rating may damage the device.

Note 2. The device is not guaranteed to function outside its operating rating.

Note 3. Absolute maximum rating is intended for voltage transients only, prolonged dc operation is not recommended.

Note 4. = V + 2.5V or 4V whichever is greater.

IN(min)

OUT

Note 5. Devices are ESD sensitive. Handling precautions recommended.

Note 6. Measured on 1" square of 1 oz. copper FR4 printed circuit board connected to the device ground leads.

Note 7. Test at T = +85°C, guaranteed by design, and characterized to T = +125°C.

Test Circuit

Device Under Test

68µH

+12V

SHUTDOWN

ENABLE

SHDN

GND

5–8

SOP-8

Current Limit Test Circuit

Shutdown Input Behavior

OFF

GUARANTEED

OFF

0.8V

TYPICAL

OFF

1.6V

V_IN(max)

Shutodwn Hysteresis

MIC4680

June 2000

MIC4680

Micrel

Typical Characteristics

Shutdown Current

vs. Input Voltage

Line Regulation

Load Regulation

5.06

5.04

5.02

5.00

4.98

4.96

100

I_OUT= 1.0A

5.05

5.04

5.03

5.02

5.01

5.00

4.99

4.98

4.97

4.96

V_IN= 12V

V_OUT= 5V

10 15 20 25 30 35

INPUT VOLTAGE (V)

0.2 0.4 0.6 0.8 1.0 1.2 1.4

OUTPUT CURRENT (A)

10 15 20 25 30 35

INPUT VOLTAGE (V)

Shutdown Current

vs. Temperature

Current Limit

Characteristic

Frequency vs.

Supply Voltage

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

202

201

200

199

198

197

196

V_IN= 12V

_SHDN= V_IN

V_IN= 12V

-50 -25

25 50 75 100 125

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

OUTPUT CURRENT (A)

10 15 20 25 30 35

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

Frequency vs.

Temperature

Feedback Voltage

vs. Temperature

Saturation Voltage

vs. Temperature

220

1.242

1.240

1.238

1.236

1.234

1.232

1.230

1.228

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

210

200

190

180

V_IN= 12V

V_OUT= 5V

I_LOAD= 1A

V_IN= 12V

V_OUT= 5V

I_OUT= 1A

-50 -25

25 50 75 100 125

-50 -25

25 50 75 100 125 150

-50 -25

25 50 75 100 125

TEMPERATURE (°C)

3.3V Output

Efficiency

5V Output

Efficiency

12V Output

Efficiency

100

24V

15V

24V

12V

0.2 0.4 0.6 0.8 1.0 1.2 1.4

OUTPUT CURRENT (A)

0.2 0.4 0.6 0.8 1.0 1.2 1.4

OUTPUT CURRENT (A)

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

OUTPUT CURRENT (A)

June 2000

MIC4680

Micrel

Safe

Operating Area

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

Minimum

Current Limit

Note

V_OUT= 5V

_A= 60°C

Demonstration

board layout

INPUT VOLTAGE (V)

Note. For increased output current, see “Applications Information:

Increasing the Maximum Output Current” and Figure 3.

Functional Characteristics

Switching Frequency Foldback

Load Transient

V_IN= 12V

V_OUT= 5V

I_OUT= 1.0A to 0.1A

Normal

5.1V

Operation

200kHz

Short

Circuit

Operation

60kHz

TIME

TIME (100ms/div.)

Frequency Foldback

The MIC4680 folds the switching frequency back during a hard

short-circuit condition to reduce the energy per cycle and

protect the device.

MIC4680

June 2000

MIC4680

Micrel

Bode Plots

The following bode plots show that the MIC4680 is stable over all conditions using a 68µF inductor (L) and a 220µF output

capacitor (C ). To assure stability, it is a good practice to maintain a phase margin of greater than 35°.

OUT

No-Load Stability

Full-Load Stability

Phase Margin = 106°

Phase Margin = 114°

L = 68µF

C_OUT= 220µF

L = 68µF

C_OUT= 220µF

V_IN= 7V

V_OUT= 5.0V

I_OUT= 1.0A

V_IN= 7V

V_OUT= 5.0V

I_OUT= 0.0A

TIME (100ms/div.)

No-Load Stability

Full-Load Stability

Phase Margin = 117°

Phase Margin = 69°

L = 68µF

C_OUT= 220µF

L = 68µF

C_OUT= 220µF

V_IN= 12V

V_OUT= 5.0V

I_OUT= 0.0A

V_OUT= 5.0V

I_OUT= 1.0A

TIME (100ms/div.)

No-Load Stability

Full-Load Stability

Phase Margin = 125°

Phase Margin = 71°

L = 68µF

C_OUT= 220µF

L = 68µF

C_OUT= 220µF

V_IN= 34V

V_OUT= 5.0V

I_OUT= 1.0A

V_IN= 34V

V_OUT= 5.0V

I_OUT= 1.0A

TIME (100ms/div.)

June 2000

MIC4680

Micrel

Block Diagrams

V_IN

SHDN

Internal

Regulator

200kHz

Oscillator

Thermal

Shutdown

Current

Limit

Com-

parator

V_OUT

C_OUT

Driver

Switch

Reset

Error

Amp

1.23V

Bandgap

Reference

MIC4680-x.x

GND

Fixed Regulator

V_IN

SHDN

Internal

Regulator

= V

REF

OUT

R1= R2

−1

200kHz

Oscillator

Thermal

Shutdown

Current

Limit

REF

= 1.23V

REF

Com-

parator

V_OUT

C_OUT

Driver

Switch

Reset

Error

Amp

1.23V

Bandgap

Reference

MIC4680 [adj.]

Adjustable Regulator

MIC4680

June 2000

MIC4680

Micrel

A higher feedback voltage increases the error amplifier

output voltage. A higher error amplifier voltage (comparator

inverting input) causes the comparator to detect only the

peaks of the sawtooth, reducing the duty cycle of the com-

parator output. A lower feedback voltage increases the duty

cycle. The MIC4680 uses a voltage-mode control architec-

ture.

Functional Description

The MIC4680 is a variable duty cycle switch-mode regulator

with an internal power switch. Refer to the block diagrams.

Supply Voltage

The MIC4680 operates from a +4V to +34V unregulated

input. Highest efficiency operation is from a supply voltage

around +15V. See the efficiency curves.

Output Switching

Enable/Shutdown

When the internal switch is on, an increasing current flows

from the supply V through external storage inductor L1, to

The shutdown (SHDN) input is TTL compatible. Ground the

input if unused. A logic-low enables the regulator. A logic-

high shuts down the internal regulator which reduces the

IN,

output capacitor C

and the load. Energy is stored in the

OUT

inductor as the current increases with time.

current to typically 1.5µA when V

= V = 12V and 30µA

When the internal switch is turned off, the collapse of the

magnetic field in L1 forces current to flow through fast

SHDN

whenV

=5V. See“ShutdownInputBehavior:Shutdown

SHDN

Hysteresis.”

recovery diode D1, charging C

OUT

Feedback

Output Capacitor

Fixed-voltage versions of the regulator have an internal

resistive divider from the feedback (FB) pin. Connect FB

directly to the output voltage.

External output capacitor C

reduces ripple. See “Bode Plots” for additional information.

provides stabilization and

OUT

Return Paths

Adjustable versions require an external resistive voltage

dividerfromtheoutputvoltagetoground,centertappedtothe

FB pin. See Figure 6b for recommended resistor values.

During the on portion of the cycle, the output capacitor and

load currents return to the supply ground. During the off

portion of the cycle, current is being supplied to the output

capacitor and load by storage inductor L1, which means that

D1 is part of the high-current return path.

Duty Cycle Control

A fixed-gain error amplifier compares the feedback signal

with a 1.23V bandgap voltage reference. The resulting error

amplifier output voltage is compared to a 200kHz sawtooth

waveform to produce a voltage controlled variable duty cycle

output.

June 2000

MIC4680

Micrel

Applications Information

Adjustable Regulators

Adjustable regulators require a 1.23V feedback signal. Rec-

ommended voltage-divider resistor values for common out-

put voltages are included in Figure 1b.

MIC4680BM

V_IN

C_IN

V_OUT

For other voltages, the resistor values can be determined

using the following formulas:

SHUTDOWN

ENABLE

SHDN

GND

C_OUT

= V

5–8

OUT

REF

OUT

R1= R2

−1

Figure 1a. Adjustable Regulator Circuit

REF

= 1.23V

REF

V_OUTR1*

R2*

C_IN

C_OUT

68µH 1.5A

1.8V 3.01k 6.49k

2.5V 3.01k 2.94k

3.3V 3.01k 1.78k

5.0V 3.01k 976Ω

6.0V 3.01k 787Ω

2A 60V Schottky

Coiltronics UP2B-680

15µF 35V

AVX TPSE156035R0200

220µF 10V

AVX TPSE227010R0060

B260A Vishay-Diode, Inc.***

SS26 General Semiconductor

Sumida CDRH125-680MC**

Sumida CDRH124-680MC**

All resistors 1%

** shielded magnetics for low RFI applications

*** Vishay-Diode, Inc. (805) 446-4800

Figure 1b. Recommended Components for Common Ouput Voltages

MIC4680

June 2000

MIC4680

Micrel

Thermal Considerations

Minimum Copper/Maximum Current Method

The MIC4680 SuperSwitcher features the power-SOP-8.

This package has a standard 8-lead small-outline package

profile but with much higher power dissipation than a stan-

dardSOP-8.TheMIC4680SuperSwitcheristhefirstdc-to-dc

converter to take full advantage of this package.

UsingFigure3, foragiveninputvoltagerange, determinethe

minimum ground-plane heat-sink area required for the

application’s maximum output current. Figure 3 assumes a

constant die temperature of 75°C above ambient.

1.5

12V

The reason that the power SOP-8 has higher power dissipa-

tion (lower thermal resistance) is that pins 5 though 8 and the

die-attach paddle are a single piece of metal. The die is

attached to the paddle with thermally conductive adhesive.

This provides a low thermal resistance path from the junction

of the die to the ground pins. This design significantly im-

proves package power dissipation by allowing excellent heat

transfer through the ground leads to the printed circuit board.

1.0

0.5

24V

34V

T_A= 50°C

Minimum Current Limit = 1.3A

One of the limitation of the maximum output current on any

MIC4680 design is the junction-to-ambient thermal resis-

AREA (cm )

Figure 3. Output Current vs. Ground Plane Area

tance (θ ) of the design (package and ground plane).

When designing with the MIC4680, it is a good practice to

connect pins 5 through 8 to the largest ground plane that is

practical for the specific design.

Examining θ in more detail:

= (θ + θ

)

where:

Checking the Maximum Junction Temperature:

= junction-to-case thermal resistance

= case-to-ambient thermal resistance

For this example, with an output power (P

) of 5W, (5V

OUT

output at 1A maximum with V = 12V) and 65°C maximum

ambient temperature, what is the maximum junction tem-

perature?

is a relatively constant 20°C/W for a power SOP-8.

is dependent on layout and is primarily governed by the

Referring to the “Typical Characteristics: 5V Output Effi-

ciency” graph, read the efficiency (η) for 1A output current at

connection of pins 5 though 8 to the ground plane. The

purpose of the ground plane is to function as a heat sink.

= 12V or perform you own measurement.

isideally63°C/Wbutwillvarydependingonthesizeofthe

η = 79%

ground plane to which the power SOP-8 is attached.

The efficiency is used to determine how much of the output

Determining Ground-Plane Heat-Sink Area

power (P

) is dissipated in the regulator circuit (P ).

OUT

There are two methods of determining the minimum ground

plane area required by the MIC4680.

OUT

P =

−P

OUT

Quick Method

Make sure that MIC4680 pins 5 though 8 are connected to a

ground plane with a minimum area of 6cm . This ground

P_D=

− 5W

0.79

plane should be as close to the MIC4680 as possible. The

area maybe disributed in any shape around the package or

on any pcb layer as long as there is good thermal contact to

pins 5 though 8. This ground plane area is more than

sufficient for most designs.

P = 1.33W

A worst-case rule of thumb is to assume that 80% of the total

output power dissipation is in the MIC4680 (P

is in the diode-inductor-capacitor circuit.

) and 20%

D(IC)

= 0.8 P

D(IC)

= 0.8 × 1.33W

= 1.064W

SOP-8

Calculate the worst-case junction temperature:

T = P + (T – T ) + T

D(IC) JC

A(max)

where:

T = MIC4680 junction temperature

= MIC4680 power dissipation

D(IC)

θ_JA

= junction-to-case thermal resistance.

ground plane

heat sink area

θ_JC

θ_CA

BIENT

The θ for the MIC4680’s power-SOP-8 is

approximately 20°C/W. (Also see Figure 1.)

T = “pin” temperature measurement taken at the

entry point of pins 6 or 7 into the plastic package

MIC4680

printed circuit board

Figure 2. Power SOP-8 Cross Section

June 2000

MIC4680

at the ambient temperature (T ) at which T is

Micrel

components shown in Figure 4 will reduce the overall loss in

measured.

the MIC4680 by about 20% at high V and high I

OUT

T = ambient temperature at which T is measured.

Even higher output current can be achieved by using the

MIC4680 to switch an external FET. See Figure 9 for a 5A

supply with current limiting.

= maximum ambient operating temperature

A(max)

for the specific design.

Layout Considerations

Calculating the maximum junction temperature given a

maximum ambient temperature of 65°C:

Layout is very important when designing any switching regu-

lator.Rapidlychangingswitchingcurrentsthroughtheprinted

circuit board traces and stray inductance can generate volt-

age transients which can cause problems.

T = 1.064 × 20°C/W + (45°C – 25°C) + 65°C

T = 106.3°C

This value is less than the allowable maximum operating

junction temperature of 125°C as listed in “Operating Rat-

ings.” Typical thermal shutdown is 160°C and is listed in

“Electrical Characteristics.”

To minimize stray inductance and ground loops, keep trace

lengths, indicated by the heavy lines in Figure 5, as short as

possible. For example, keep D1 close to pin 3 and pins 5

through 8, keep L1 away from sensitive node FB, and keep

Increasing the Maximum Output Current

close to pin 2 and pins 5 though 8. See “Applications

The maximum output current at high input voltages can be

increased for a given board layout. The additional three

Information: Thermal Considerations” for ground plane lay-

out.

Thefeedbackpinshouldbekeptasfarwayfromtheswitching

elements (usually L1 and D1) as possible.

A circuit with sample layouts are provided. See Figure 6a

though 6e.

MIC4680BM

1N4148 82Ω

SHDN

2.2nF

GND

6 7 8

Figure 4. Increasing Maximum Output Current at High Input Voltages

V_IN

MIC4680BM

V_OUT

C_OUTR1

+4V to +34V

68µH

C_IN

SHDN

GND

Power

SOP-8

6 7 8

GND

Figure 5. Critical Traces for Layout

V_IN

V_OUT

U1 MIC4680BM

4V to +34V

0.1µF

50V

68µH

C3*

optional

15µF

35V

GND

3.01k

OFF

SHDN

220µF

10V

0.1µF

50V

NKK G12AP

2.94k

1.78k

GND

5–8

B260A optional 6.49k

976Ω

SOP-8

SS26

JP1a

1.8V

JP1b

JP1c⁷JP1d

3.3V 5.0V

2.5V

GND

* C3 can be used to provide additional stability

and improved transient response.

Figure 6a. Evaluation Board Schematic Diagram

MIC4680

June 2000

MIC4680

Micrel

Printed Circuit Board Layouts

Figure 6d. Bottom-Side Silk Screen

Figure 6b. Top-Side Silk Screen

Figure 6c. Top-Side Copper

Figure 6e. Bottom-Side Copper

Abbreviated Bill of Material (Critical Components)

Reference

Part Number

Manufacturer

Description

Qty

TPSD156M035R0300

ECE-A1HFS470

AVX¹

Panasonic²

15µF 35V

47µF 50V, 8mm × 11.5mm

TPSD227M010R0150

AVX

220µF 10V

B260A

SS26

Vishay-Diodes, Inc.³

General Semiconductor

Schottky

UP2B-680

CDH115-680MC

CDRH124-680MC

Coiltronics⁴

Sumida⁵

68µH, 1.5A, nonshielded

68µH, 1.5A, shielded

Sumida⁵

MIC4680BM

Micrel Semiconductor⁶

1A 200kHz power-SO-8 buck regulator

AVX: http://www.avxcorp.com

Panasonic: http://www.maco.panasonic.co.jp/eccd/index.html

Vishay-Diodes, Inc., tel: (805) 446-4800, http://www.diodes.com

Coiltronics, tel: (561) 241-7876, http://www.coiltronics.com

Sumida, tel: (408) 982-9960, http://www.sumida.com

Micrel, tel: (408) 944-0800, http://www.micrel.com

June 2000

MIC4680

Micrel

Applications Circuits*

For continuously updated circuits using the MIC4680, see Application Hint 37 at www.micrel.com.

1N4148

220nF

5V ±2%

MIC4680BM

+34V max.

0.100Ω

800mA ±5%

10nF

100µH

4.99k

100nF

22µF

35V

GND

220µF

OFF

SHDN

GND

MMBR140LT3

10V

NKK G12AP

1N4148

lphone

3.01k

SOP-8

5–8

16.2k

976Ω

MIC6211BM5

221k

LM4041DIM3-1.2

Ceular

10k

GND

Figure 7. Constant Current and Constant Voltage Battery Charger

U1 MIC4680BM

+12V

GND

33µH

0.022µF

50V

8.87k

68µF

20V

33µF

35V

68µF

20V

0.1µF

SHDN

GND

5–8

ES1B

1A 100V

SOP-8

–12V/150mA

GND

Figure 8. +12V to –12V/150mA Buck-Boost Converter

+4.5V to +17V

U1 MIC4680BM MIC4417BM4

Si4425DY

L1*

330µF

25V

20mΩ

3.3V/5A

50µH

SHUTDOWN

ENABLE

SHDN

220µF

16V

1000pF

220µF

3.01k

GND

16V

SOP-8

5–8

0.1µF

16k 1%

* I_SAT= 8A

1N4148

16k

MIC6211BM5 1.78k

GND

Figure 9. 5V to 3.3V/5A Power Supply

* See Application Hint 37 for bills of material.

MIC4680

June 2000

MIC4680

Micrel

June 2000

MIC4680

Micrel

Package Information

0.026 (0.65)

MAX)

PIN 1

0.157 (3.99)

0.150 (3.81)

DIMENSIONS:

INCHES (MM)

0.020 (0.51)

0.013 (0.33)

0.050 (1.27)

TYP

45°

0.0098 (0.249)

0.0040 (0.102)

0.010 (0.25)

0.007 (0.18)

0°–8°

0.197 (5.0)

0.189 (4.8)

0.050 (1.27)

0.016 (0.40)

SEATING

PLANE

0.064 (1.63)

0.045 (1.14)

0.244 (6.20)

0.228 (5.79)

8-Lead SOP (M)

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

MIC4680

June 2000

MIC4680-3.3BM相关文章

配单直通车

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MIC4680-3.3BM产品参数

型号:	MIC4680-3.3BM
是否Rohs认证：	不符合
生命周期：	Obsolete
零件包装代码：	SOIC
包装说明：	SOP, SOP8,.25
针数：	8
Reach Compliance Code：	not_compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	5.16
Is Samacsys：	N
模拟集成电路 - 其他类型：	SWITCHING REGULATOR
控制模式：	VOLTAGE-MODE
最大输入电压：	34 V
最小输入电压：	4 V
标称输入电压：	12 V
JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0
长度：	4.93 mm
湿度敏感等级：	1
功能数量：	1
端子数量：	8
最高工作温度：	125 °C
最低工作温度：	-40 °C
最大输出电流：	1.3 A
封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP
封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	240
认证状态：	Not Qualified
座面最大高度：	1.73 mm
子类别：	Switching Regulator or Controllers
表面贴装：	YES
切换器配置：	BUCK
最大切换频率：	220 kHz
温度等级：	AUTOMOTIVE
端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	GULL WING
端子节距：	1.27 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	30
宽度：	3.94 mm
Base Number Matches：	1

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