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ML4873CR

Battery Power Control IC

Micro Linear Corporation 

GENERAL DESCRIPTION

The ML4873 is a complete solution for DC to DC

conversion and power management in multi-cell battery

powered portable computers and instruments. Several

advanced techniques are incorporated in the IC for the

highest possible system efficiency and lowest battery

drain.

The 5.0V and 3.3V main regulators in the ML4873 each

control synchronous rectified buck regulators and drive

N-channel MOSFETs. This allows high conversion

efficiencies (90% or greater). The drive for the upper

N-channel MOSFETs in the system is provided via a

separate input from a charge pump.

A special “burst mode” for efficient low current operation

is provided on one of the regulators for suspend mode.

A low drop-out 12V linear regulator for programming

EEPROMs or PCMCIA is provided on chip with a separate

input, provided by either a winding on the main inductor

or from the battery pack.

A µPower 5V linear regulator is provided for the power

monitoring logic. The IC can be turned off with only the

5V regulator operating.

BLOCK DIAGRAM

AC

ADAPTER

6 TO 30V

VIN

19

VGT

15

VADAPTER

3

VG5

13

VREF

28

GND

22

4 BURST

2.5VREF

LIN OUT

10

5V

µPOWER

BIAS

LIN REG. VIN

+5V

L2

27 ON/OFF

LOGIC

V12 IN

24

5 12 BASE

12V OUT

1

ON/OFF 12

12

14 12V BIAS

ENABLE B

16

12V LDO

LINEAR

REG.

January 1997

ML4873

Battery Power Control IC

FEATURES

s Two synchronously rectified, 100kHz buck regulators

for 5V and 3.3V outputs

s Regulation to ±3% maximum: provides 2% PCMCIA

switch matrix margin.

s N-channel MOSFET drive for lowest cost

s Burst mode for efficient operation at light load

s µPower 5V standby linear regulator for power

management logic

s 12V low drop out linear regulator with high output (to

300mA) capability

s Automatic charger disconnect switch comparator and

N-channel driver

s Wide input voltage range (5.5V to 30V)

s 28-Lead SOIC or SSOP packages

VGT

ISENSEA 18

OUT1A

20

VIN

OUT2A

23

PWR GND

21

FDBK A

26

COMP A

25

OSC

RT 2

SOFT START

17

ISENSEB 11

VGT

OUT1B

9

VIN

OUT2B

8

FDBK B 6

COMP B

7

RSA

VIN

L1

VOUT A

3.3 VDC

RT

VIN

RSB

L2

VOUT B

5 VDC

1

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