Datasheet

7Maxim Integrated
1V to 16V, Single-Channel, Hot-Swap Controllers
with Precision Current-Sensing Output
MAX5977A/MAX5977B
Pin Description
Pin Configuration
19
20
18
17
7
6
8
PWR
OV
9
REG
GATE CSOUT PG SOURCE
1
EP*
*CONNECT TO AGND.
2
I.C.
45
15 14 12 11
I.C.
BIAS
SENSE
IN
SCOMP
FCOMP
MAX5977A
MAX5977B
AGND
GND
3
13
CAL
16
10
CALSENSE
FAULT
THIN QFN
TOP VIEW
UV
PIN NAME FUNCTION
1 REG
Regulator Output. Bypass REG with a 1FF capacitor.
2 PWR
Power-Supply Input. Bypass PWR with a 0.1FF or higher value capacitor.
3 AGND Analog Ground
4 UV
Active-High Precision Turn-On Input. UV is used to turn on/off the output and set the input
undervoltage lockout threshold.
5 OV
Active-Low Precision Turn-On Input. OV is used to turn on/off the output and set the input overvoltage
lockout threshold.
6 FCOMP
Fast Circuit-Breaker Comparator Input. Connect FCOMP to IN with a resistor to set the fast-trip circuit-
breaker threshold.
7 SCOMP
Slow Circuit-Breaker Comparator Input. Connect SCOMP to IN with a resistor to set the slow-trip
circuit-breaker threshold.
8 IN Hot-Swap Voltage-Monitoring Input
9 SENSE
Current-Sense Voltage Input. The voltage across an external sense resistor between IN and SENSE is
used to measure the channel current.
10 CALSENSE Calibration Voltage Input
11 PG Power-Good, Active-High Open-Drain Output
12 CSOUT
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 (2500FS typ).
13 GND Ground
14 GATE Gate-Driver Output. Connect GATE to the gate of the external n-channel MOSFET switch.
15 SOURCE MOSFET Source Voltage Input. Connect SOURCE to the source of the external n-channel MOSFET.
16
FAULT Active-Low, Open-Drain Fault Output. When an overcurrent occurs, FAULT goes low.
17 CAL Calibration Mode Select Input
18, 19 I.C. Internally Connected. Connect to ground.
20 BIAS Bias Input. Connect BIAS to REG.
— EP Exposed Pad. Connect to AGND.