ML4873 Просмотр технического описания (PDF) - Micro Linear Corporation

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ML4873

Battery Power Control IC

Micro Linear Corporation 

ML4873

PIN CONFIGURATION

12V OUT

RT

VADAPTER

BURST

12V BASE

FDBK B

COMP B

OUT2B

OUT1B

LIN OUT

ISENSEB

ON/OFF 12

VG5

12V BIAS

ML4873

28-PinSOIC (S28W)

or 28-Pin SSOP (R28)

1

28

VREF

2

27

ON/OFF

3

26

FDBK A

4

25

COMP A

5

24

V12 IN

6

23

OUT2A

7

22

GND

8

21

PWR GND

9

20

OUT1A

10

19

VIN

11

18

ISENSEA

12

17

SOFT START

13

16

ENABLE B

14

15

VGT

TOP VIEW

PIN DESCRIPTION

PIN# NAME

FUNCTION

1 12V OUT 12V Low Drop-Out regulator output

2 RT

Timing Resistor which sets oscillator

frequency

3 VADAPTER

4 BURST

Input to sense whether adapter is

active. VG5 goes high when this pin is

above VREF.

A logic 1 sets Buck Regulator A into

burst mode (see table 1)

5 12V BASE Connection to increase 12V regulator

output current with external NPN pass

transistor

6 FDBK B Voltage Feedback for buck regulator B

7 COMP B Buck Regulator B frequency

compensation terminal

8 OUT2B 5V Buck Regulator Switch Output

9 OUT1B

5V Buck Regulator Synchronous

Rectifier Output

10 LIN OUT

Output of the µPower 5V regulator.

Normally used to power external

management circuits and logic

11 ISENSEB

Current Sensing for buck regulator B

Current limit

12 ON/OFF 12 A logic 1 turns on the 12V regulator

13 VG5

Output to drive N-Channel MOSFET

gate to switch battery out when

adapter is present

PIN# NAME

FUNCTION

14 12V BIAS Bias supply for 12V Regulator

15 VGT

N-Channel high side gate drive

16 ENABLE B A logic 1 enables buck regulator B

17 SOFT START Soft Start Capacitor

18 ISENSEA

Current Sensing for buck regulator A

current limit

19 VIN

20 OUT1A

Input from Battery or AC Adapter

3.3V Buck Regulator Switch Output

21 PWR GND Power Ground

22 GND

Logic and signal Ground

23 OUT2A

3.3V Buck Regulator Synchronous

Rectifier Output

24 V12 IN

Power Input for the 12V regulator

25 COMP A Buck Regulator A frequency

compensation terminal

26 FDBK A Voltage Feedback for buck regulator A

27 ON/OFF

A low on this pin disables all IC

functions except the linear 5V

regulator and the 2.5V reference, and

puts the IC onto a low current

consumption mode

28 VREF

Buffered 2.5V reference output

2

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