MAX6876 datasheet(14/39 Pages) MAXIM

14 / 39 page

EEPROM-Programmable, Quad,

Power-Supply Tracker/Sequencer Circuit

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voltages at the sources of the MOSFETs are compared

to each other to ensure that the voltage differential

between each monitored supply does not exceed

250mV (typ). Tracking is dynamically adjusted to force

all outputs to track within a ±125mV window from a ref-

erence ramp; if, for any reason, any supply fails to track

within ±250mV from the reference ramp, the FAULT

output is asserted, the power-up mode is terminated,

and all outputs are powered off. Power-up mode is in

the same way terminated if the controlled voltages fail

to complete the ramp up within a programmable FAULT

timeout. The MAX6876 generates all required voltages

(with internal charge pumps) and timing to control up to

four external n-channel MOSFETs for the OUT1–OUT4

supply voltages.

A synchronization feature allows up to 16 voltages to

be tracked simultaneously. In addition, HOLD and

SYNCH communicate synchronization status between

master/slave devices in multiple MAX6876 applications.

Other features of the MAX6876 include a reset circuit

with an I2C-programmable timeout feature. A manual

reset input (MR) and a margin disable input (MARGIN)

allow for more control during the manufacturing process.

The device also features four power-good outputs (PG_),

an overcurrent output (OC), and a bus-removal safe

(REM) output. The device has an accurate internal 1.25V

reference; for greater accuracy, connect an external

+1.25V reference to REFIN.

COMP

CONTROL

LOGIC

1.25V

INTERNAL

SUPPLY/UVLO

EEPROM/

CONFIGURATION

REGISTERS

REF

IN1

UV/OV

IN2

UV/OV

IN3

UV/OV

IN4

UV/OV

TRACKING

MONITORS

OUT1

OUT2

OUT3

OUT4

IN1

IN2

IN3

IN4

RAMP

GENERATOR

IN1

IN2

IN3

IN4

VCC

CHARGE

PUMP

OVER-

CURRENT

DETECT

VCP1 = VIN1 + 5V

COMP

IN1

VTHPG

IN2 TO OUT2

CONTROL BLOCK

GATE2

PG2

OUT2

IN3 TO OUT3

CONTROL BLOCK

GATE3

PG3

OUT3

IN4 TO OUT4

CONTROL BLOCK

GATE4

PG4

OUT4

PG1

MAX6876

RAMP

ABP

GND

ABP

GATE1 OUT1

ABP

Functional Diagram

MAX6876 Datasheet(PDF) 14 Page - Maxim Integrated Products

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