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LTC1642
1642fb
OV (Pin 9): Overvoltage Input. When the voltage on OV
exceeds its trip point the GATE pin is pulled low immedi-
ately and the CRWBR timer starts. If OV remains above its
trip point (minus 3mV of hysteresis) long enough for
CRWBR to reach its trip point, then the part turns off until
reset by pulsing the ON pin low. Otherwise, the GATE pin
begins ramping up one RST TMR timing cycle after OV
goes below its trip point. Ground the OV pin to disable
overvoltage protection.
COMPOUT (Pin 10): Uncommitted Comparators Open
Drain Output.
COMP
+
 (Pin 11): Uncommitted Comparators Noninvert-
ing Input.
COMP

 (Pin 12): Uncommitted Comparators Inverting
Input.
REF (Pin 13): Reference Voltage Output. The 1.22V ?/SPAN>1%
reference should be bypassed with a 0.1礔 compensation
capacitor. For V
CC
 = 5V it can source 1mA.
GATE (Pin 14): Gate Drive for the External N-Channel
MOSFET. An internal charge pump provides at least 4.5V
of gate drive and sources 25礎. The pin requires an
external series RC network to ground to compensate the
current limit loop and to limit the ramp rate. A resistor of
100& is also recommended in series with the MOSFET
PI   FU CTIO S
U
U
gate to suppress high frequency oscillations. GATE is
immediately pulled to ground when the overvoltage com-
parator trips or the input supply is below the undervoltage
lockout trip point. During current limit the GATE voltage is
adjusted to maintain constant load current until the circuit
breaker timer trips. At that point GATE is pulled to ground
until the chip is reset. Clamp the GATE pin with an 18V
zener diode (IN4705) to ground if the supply is 8V
or higher.
SENSE (Pin 15): Current Sense Input. To use the current
limit place a sense resistor in the supply path between V
CC
and SENSE. When the drop across the resistor exceeds a
threshold voltage, the GATE pin is adjusted to maintain a
constant load current and the circuit breaker timer is
started. A foldback feature reduces the current limit as the
voltage at FB approaches ground. Short SENSE to V
CC
 to
disable the current limiting.
V
CC
 (Pin 16): Positive Supply Voltage. An internal under-
voltage lockout circuit holds the GATE pin at ground until
V
CC
 exceeds 2.73V. If V
CC
 exceeds 16.5V an internal shunt
regulator protects the chip from V
CC
  and SENSE pin
voltages up to 33V. In this case the GATE pin voltage will
usually be low but this is not guaranteed; use the OV pin
to ensure that the pass device is off. The V
CC
 pin also
provides a high side connection to the SENSE resistor.
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