Must exceed v, 95v). • the corresponding v, 875v). • no faults may be present on any channel – Rainbow Electronics MAX5929 User Manual
Page 10
MAX5927/MAX5929
The MAX5927/MAX5929 turn off all channels if any of
the above conditions are not met. After a fault-latched
shutdown, cycle any of the ON_ inputs to unlatch and
restart all channels.
Power-Sequencing Mode
Leave MODE floating to enter power-sequencing
mode. While in power-sequencing mode, the
MAX5927/MAX5929 turn on and off each channel
depending on the state of the corresponding V
ON_
. To
turn on a given channel:
• At least one V
IN_
must exceed V
UVLO
(2.45V) for the
UVLO to startup delay (37.5ms).
• All V
IN_
must exceed V
PWRRDY
(0.95V).
• The corresponding V
ON_
must exceed V
ON,TH
(0.875V).
• No faults may be present on any channel.
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
10
______________________________________________________________________________________
FAST COMP.
SLOW COMP.
FAST DISCHARGE
Q1
OUT1
2.45V
BIAS AND
REFERENCES
STARTUP
OSCILLATOR
TIMING
OSCILLATOR
CHARGE
PUMP
DEVICE CONTROL
LOGIC
V
SC, TH
V
FC, TH
R
LIM1
SENSE1
IN1
GATE1
R
SENSE1
LIM1*
R
TIM
TIM
1nF
BIAS
POL*
R
LIM2
100
µA
UVLO
UVLO
FAST COMP.
SLOW COMP.
FAST DISCHARGE
SLOW DISCHARGE
SLOW DISCHARGE
Q2
OUT2
CHARGE
PUMP
CURRENT CONTROL
AND
STARTUP LOGIC
CURRENT CONTROL
AND
STARTUP LOGIC
V
SC, TH
V
FS, TH
SENSE2
IN2
GATE2
R
SENSE2
LIM2*
100
µA
STAT2
STAT1
LIM3*
LIM4*
FAST COMP.
SLOW COMP.
FAST DISCHARGE
Q3
OUT3
FAULT
MANAGEMENT
OPERATION
MODE
CHARGE
PUMP
ON
INPUT
CONPARATORS
V
SC, TH
V
FS, TH
SENSE3
IN3
GATE3
R
SENSE3
R
LIM3
R
LIM4
100
µA
UVLO
UVLO
FAST COMP.
SLOW COMP.
FAST DISCHARGE
SLOW DISCHARGE
SLOW DISCHARGE
Q4
OUT4
CHARGE
PUMP
CURRENT CONTROL
AND
STARTUP LOGIC
CURRENT CONTROL
AND
STARTUP LOGIC
V
SC, TH
V
FS, TH
SENSE4
IN4
GATE4
R
SENSE4
100
µA
3mA/
50mA
3mA/
50mA
3mA/
50mA
3mA/
50mA
STAT4
STAT3
*MAX5927 ONLY.
LATCH*
MODE
ON1 ON2 ON3 ON4
MAX5927
MAX5929
Figure 1. Functional Diagram