LTC4210-2CS6 datasheet(6/20 Pages) LINER

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LTC4210-1/LTC4210-2

421012f

VCB vs Supply Voltage

4210 G24

SUPPLY VOLTAGE (V)

TA = 25°C

–75

150

–25

–50

75 100 125

TEMPERATURE (

°C)

4210 G25

VCC = 5V

TYPICAL PERFOR A CE CHARACTERISTICS

VCB vs Temperature

PI FU CTIO S

TIMER (Pin 1): Timer Input Pin. An external capacitor

CTIMERsets a 272.9ms/µF initial timing delay and a 21.7ms/

µF circuit breaker delay. The GATE pin turns off whenever

the TIMER pin is pulled beyond the COMP2 threshold,

such as for overvoltage detection with an external zener.

GND (Pin 2): Ground Pin.

ON (Pin 3): ON Input Pin. The ON pin comparator has a

low-to-high threshold of 1.3V with 80mV hysteresis and a

glitch filter. When the ON pin is low, the LTC4210 is reset.

When the ON pin goes high, the GATE turns on after the

initial timing cycle.

GATE (Pin 4): GATE Output Pin. This pin is the high side

gate drive of an external N-channel MOSFET. An internal

charge pump provides a 10

µA pull-up current with Zener

clamps to VCC and ground. In overload, the error amplifier

(EA) controls the external MOSFET to maintain a constant

load current. An external R-C compensation network

should be connected to this pin for current limit loop

stability.

SENSE (Pin 5): Current Limit Sense Input Pin. A sense

resistor between the VCC and SENSE pins sets the analog

current limit. In overload, the EA controls the external

MOSFET gate to maintain the SENSE pin voltage at 50mV

below VCC. When the EA is maintaining current limit, the

TIMER circuit breaker mode is activated. The current limit

loop/circuit breaker mode can be disabled by connecting

the SENSE pin to the VCC pin.

VCC (Pin 6): Positive Supply Input Pin. The operating

supply voltage range is between 2.7V to 16.5V. An under-

voltage lockout (UVLO) circuit with a glitch filter resets the

LTC4210 when a low supply voltage is detected.

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