Ideal Diode, Reverse-Battery, and Overvoltage Protection
Switch/Limiter Controllers with External MOSFETs
MAX16914/MAX16915
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(V
CC
= 14V, V
SHDN
= 14V, MAX16914/MAX16915 Evaluation Kit, T
A
= +25NC, unless otherwise noted.)
Pin Description
PIN NAME FUNCTION
1 V
CC
Positive Supply Input Voltage. Bypass V
CC
to GND with a 0.1FF or greater ceramic capacitor.
2 GATE1
Gate-Driver Output. Connect GATE1 to the gate of an external p-channel FET pass switch to pro-
vide low drain-to-source voltage drop, reverse voltage protection, and back-charge prevention.
3 SENSE IN
Differential Voltage Sense Input (Input Side of IC). Used with SENSE OUT to provide back-charge
prevention when the SENSE IN voltage falls below the SENSE OUT voltage by 25mV.
4 SHDN
Active-Low Shutdown/Wake Input. Drive SHDN high to turn on the voltage detectors. GATE2 is
shorted to V
CC
when SHDN is low. SHDN is internally pulled to GND through a 0.5FA current sink.
Connect SHDN to V
CC
for always-on operation.
5 OV
Open-Drain Overvoltage Indicator Output. Connect a pullup resistor from OV to a positive supply
such as V
CC
. OV is pulled low when the voltage at SET exceeds the internal threshold.
6 GND Ground
7 SET
Controller Overvoltage Threshold Programming Input. Connect SET to the center of an external
resistive divider network between TERM and GND to adjust the desired overvoltage switch-off or
limiter threshold.
8 TERM
Voltage-Divider Termination Output. TERM is internally connected to SENSE OUT in the MAX16915
and to V
CC
in the MAX16914. TERM is high impedance when SHDN is low, forcing the current to
zero in the resistor-divider connected to TERM.
9 SENSE OUT
Differential Voltage Sense Input (Output Side Of IC). Used with SENSE IN to provide back-charge
prevention when the SENSE IN voltage falls below the SENSE OUT voltage by 25mV.
10 GATE2
Gate-Driver Output. Connect GATE2 to the gate of an external p-channel FET pass switch. GATE2
is driven low during normal operation and quickly regulated or shorted to V
CC
during an overvolt-
age condition. GATE2 is shorted to V
CC
when SHDN is low.
BACK-CHARGE RESPONSE
MAX16914 toc10
1.0µs/div
2.2µF INPUT CAPACITOR, 400I
INPUT RESISTOR, 22µF OUTPUT CAPACITOR
V
CC
5V/div
V
OUT
5V/div
0V
5V
5V
V
GATE1
5V/div
V
CC
- V
GATE_
vs. INPUT VOLTAGE
MAX16914 toc11
SUPPLY VOLTAGE (V)
GATE DRIVE VOLTAGE (V)
40.536.027.0 31.513.5 18.0 22.59.0
1.5
3.0
4.5
6.0
7.5
9.0
10.5
12.0
13.5
15.0
0
4.5 44.0
GATE1
GATE2
SET = GND
SHDN = HIGH
GATE-DRIVE VOLTAGE
vs. TEMPERATURE
MAX16914 toc12
TEMPERATURE (NC)
GATE-DRIVE VOLTAGE (V)
11085603510-15
6.3
6.4
6.5
6.6
6.2
-40 125
GATE1
GATE2
V
CC
= 14V
SET = GND
SHDN = HIGH
(219 paginas)
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