LTC2913 datasheet(6/12 Pages) LINER

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LTC2913

2913fa

BLOCK DIAGRAM

0.5V

VL2

VH2

VL1

VH1

–

UVLO

VCC

–

VCC

OV PULSE

GENERATOR

DISABLE

OV LATCH

CLEAR/BYPASS

LTC2913-1

TMR

VCC

LATCH

µA

DIS

GND

2913 BD

UV PULSE

GENERATOR

OSCILLATOR

VCC

400k

LTC2913-2

PIN FUNCTIONS

TMR (Pin 9): Reset Delay Timer. Attach an external capaci-

tor (CTMR) of at least 10pF to GND to set a reset delay time

of 9ms/nF. A 1nF capacitor will generate an 8.5ms reset

delay time. Tie TMR to VCC to bypass timer.

UV (Pin 7): Undervoltage Logic Output. Asserts low when

either VH input voltage is below threshold. Held low for a

programmed delay time after both VH inputs are valid. UV

has a weak pull-up to VCC and may be pulled above VCC

using an external pull-up. Leave UV open if unused.

VCC (Pin 10): Supply Voltage. Bypass this pin to GND with

a 0.1µF (or greater) capacitor. Operates as a direct supply

inputforvoltagesupto6V.Operatesasashuntregulatorfor

supplyvoltagesgreaterthan6Vandmusthavearesistance

between the pin and the supply to limit input current to no

greater than 10mA. When used without a current-limiting

resistance, VCC voltage must not exceed 6V.

VH1/VH2 (Pin 1/Pin 3): Voltage High Inputs 1 and 2. When

the voltage on this pin is below 0.5V, an undervoltage

condition is triggered. Tie pin to VCC if unused.

VL1/VL2 (Pin 2/Pin 4): Voltage Low Inputs 1 and 2. When

the voltage on this pin is above 0.5V, an overvoltage condi-

tion is triggered. Tie pin to GND if unused.

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