Datasheet

7Maxim Integrated
MAX16128/MAX16129
Load-Dump/Reverse-Voltage Protection Circuits
Pin Configuration
Pin Description
PIN NAME FUNCTION
1 OUT
Output Voltage-Sense Input. Connect OUT to the load with a 100I series resistor. Bypass with a minimum
10FF capacitor to GND.
2 SRC
Source Input. Connect SRC to the common source connection of the external MOSFETs. When the
MOSFETs are turned off, this connection is clamped to GND. An external zener diode between SRC and
GATE protects the gates of the external MOSFETs.
3 GATE
Gate-Driver Output. Connect GATE to the gates of the external n-channel MOSFETs. GATE is the charge-
pump output during normal operation. GATE is quickly pulled low during a fault condition or when SHDN
is pulled low.
4 IN
Positive Supply Input Voltage. Connect IN to the positive side of the input voltage. Bypass IN with a 0.1FF
ceramic capacitor to GND.
5
SHDN
Shutdown Input. Drive SHDN low to force GATE and FLAG low and turn off the external n-channel
MOSFETs. Connect a 100kI resistor from SHDN to IN for normal operation.
6 GND Ground
7 I.C. Internally connected to GND
8
FLAG
FLAG Output. During startup, FLAG is low as long as V
OUT
is lower than 90% of V
IN
and after that
it is high impedance. It asserts low during shutdown mode, an overvoltage, thermal shutdown, or
undervoltage fault or when V
OUT
falls below 90% of V
IN
. FLAG asserts low during a cold-crank fault to
signal reverse-current protection.
TOP VIEW
+
1
2
3
4
8
7
6
5
FLAG
I.C.
GND
IN
GATE
SRC
OUT
MAX16128
MAX16129
µMAX
SHDN