MAX6876 データシートの表示（PDF） - Maxim Integrated
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MAX6876 Datasheet PDF : 39 Pages
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EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
Functional Diagram
IN1
IN2
ABP
IN3
IN4
VCC
ABP
GATE1 OUT1
IN1
UV/OV
COMP
INTERNAL
SUPPLY/UVLO
MAX6876
VCP1 = VIN1 + 5V
CHARGE
PUMP
OVER-
IN1
CURRENT
DETECT
PG1
IN1
IN2
UV/OV
COMP
IN3
UV/OV
COMP
IN4
UV/OV
COMP
EEPROM/
CONFIGURATION
REGISTERS
1.25V
REF
CONTROL
LOGIC
RAMP
GENERATOR
ABP
GND
RAMP
TRACKING
MONITORS
OUT1
OUT2
OUT3
OUT4
IN1
IN2
IN3
IN4
COMP
VTHPG
IN2 TO OUT2
CONTROL BLOCK
IN3 TO OUT3
CONTROL BLOCK
IN4 TO OUT4
CONTROL BLOCK
GATE2
PG2
OUT2
GATE3
PG3
OUT3
GATE4
PG4
OUT4
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.
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