MAX886ECJ(1999) Просмотр технического описания (PDF) - Maxim Integrated

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MAX886ECJ
(Rev.:1999)

Wireless and Satellite Handset Power-Management ICs

Maxim Integrated 

Wireless and Satellite Handset

Power-Management ICs

Detailed Description

The MAX886/MAX888 contain one high-efficiency, step-

down DC-DC converter, four low-dropout linear regula-

tors, and one regulated charge pump. The output

voltages of the switching regulator and the linear regula-

tors are software-programmable through the serial inter-

face. The regulated charge-pump output is factory set

at 5.25V. The devices also include reset and start-up

timers and a low-battery detect comparator (Figure 3).

500mA DC-DC Buck Regulator 0

Regulator 0 is a low-noise, step-down, synchronous

DC-DC converter that can source a minimum of

500mA. High operating frequency (up to 925kHz) mini-

mizes output voltage ripple and reduces the size and

cost of external components. Guaranteed 100% duty-

cycle operation provides the lowest possible dropout

voltage, extending the useful life of the battery supply.

SDA

LOGIC

SCL

DECODER

DAC1

DAC2

DAC3

DAC5

5

ON1

LINEAR

REG1

ON2

LINEAR

REG2

ON2

LINEAR

REG3

LINEAR

ON5

REG5

IN1

OUT1

IN2

OUT2

IN3

OUT3

IN5

OUT5

CVH

CVL

IN0

BATT

SYNC

RESET

ON

OFF

LBI

OUT2

10k

RESET AND

START UP

TIMER

REF

LBHYS

DGND

DAC0

OSCILLATOR

ON0 SWITCHING

REGULATOR

REG4

CHARGE

ON4 PUMP

REGULATOR

REF

LX

C+

C-

+ OUT0

PGND

IN4

OUT4

ONSTAT

LBO

GND

Figure 3. Functional Diagram

12 ______________________________________________________________________________________

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