1V to 16V, Single-Channel, Hot-Swap Controllers
with Precision Current-Sensing Output
Pin Configuration
TOP VIEW
FAULT 16
CAL 17
15
14
13
12
11
10
9
CALSENSE
SENSE
I.C. 18
I.C. 19
BIAS 20
MAX5977A
MAX5977B
EP*
8
7
6
IN
SCOMP
FCOMP
1
2
3
4
5
THIN QFN
*CONNECT TO AGND.
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18, 19
20
NAME
REG
PWR
AGND
UV
OV
FCOMP
SCOMP
IN
SENSE
CALSENSE
PG
CSOUT
GND
GATE
SOURCE
FAULT
CAL
I.C.
BIAS
EP
FUNCTION
Regulator Output. Bypass REG with a 1 F F capacitor.
Power-Supply Input. Bypass PWR with a 0.1 F F or higher value capacitor.
Analog Ground
Active-High Precision Turn-On Input. UV is used to turn on/off the output and set the input
undervoltage lockout threshold.
Active-Low Precision Turn-On Input. OV is used to turn on/off the output and set the input overvoltage
lockout threshold.
Fast Circuit-Breaker Comparator Input. Connect FCOMP to IN with a resistor to set the fast-trip circuit-
breaker threshold.
Slow Circuit-Breaker Comparator Input. Connect SCOMP to IN with a resistor to set the slow-trip
circuit-breaker threshold.
Hot-Swap Voltage-Monitoring Input
Current-Sense Voltage Input. The voltage across an external sense resistor between IN and SENSE is
used to measure the channel current.
Calibration Voltage Input
Power-Good, Active-High Open-Drain Output
Transconductance Current-Sense Amplifier Output. The output current of CSOUT is the product of the
voltage measured between SENSE and IN and the transconductance gain (2500 F S typ).
Ground
Gate-Driver Output. Connect GATE to the gate of the external n-channel MOSFET switch.
MOSFET Source Voltage Input. Connect SOURCE to the source of the external n-channel MOSFET.
Active-Low, Open-Drain Fault Output. When an overcurrent occurs, FAULT goes low.
Calibration Mode Select Input
Internally Connected. Connect to ground.
Bias Input. Connect BIAS to REG.
Exposed Pad. Connect to AGND.
7
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