LTC4210 Ver la hoja de datos (PDF) - Linear Technology
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LTC4210 Datasheet PDF : 20 Pages
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LTC4210-1/LTC4210-2
TYPICAL PERFOR A CE CHARACTERISTICS
VCB vs Supply Voltage
58
TA = 25°C
56
54
52
50
48
46
44
42
0 2 4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
4210 G24
VCB vs Temperature
58
VCC = 5V
56
54
52
50
48
46
44
42
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
4210 G25
PI FU CTIO S
TIMER (Pin 1): Timer Input Pin. An external capacitor
CTIMER sets 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 10µA 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.
421012f
6
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