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LT1641

BLOCK DIAGRA

–

µA

LOGIC

1.233V

0.5V

12mV ~ 47mV

UNDERVOLTAGE LOCKOUT

8.3V

VCC

GND

0.5V

1.233V

–

1.233V

PWRGD

TIMER

1641 BD

VCC

SENSE

VP GEN

µA

GATE

–

CHARGE

PUMP

AND

GATE

DRIVER

REF GEN

SENSE (Pin 7): The Current Limit Sense Pin. A sense

resistor must be placed in the supply path between VCC

and SENSE. The current limit circuit will regulate the

voltage across the sense resistor (VCC – VSENSE) to 47mV

when VFB is 0.5V or higher. If VFB drops below 0.5V, the

voltage across the sense resistor decreases linearly and

stops at 12mV when VFB is 0V.

To defeat current limit, short the SENSE pin to the VCC pin.

VCC (Pin 8): The Positive Supply Input ranges from 9V to

80V for normal operation. ICC is typically 2mA. An internal

undervoltage lockout circuit disables the chip for inputs

less than 8.3V. Place a 0.1

µF bypass capacitor next to the

VCC pin.

PI FU CTIO S

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