Pin Assignment

Pin Description

Pin No.

Pin Name

Description

1

SW

Switching pin

2

GND

Ground pin

3FB

Output voltage sense node. Connect the cathode of the LED to this pin. A resistor from this

pin to ground sets the LED current. Internally compares to 95mV (Typ.).

4

SHDN

Shutdown device pin. Connect to 1.5V or higher to enable device (ON), 0.3V or lower to dis-

able device (OFF).

5

OVP

For over voltage protection connect to the output.

6

VIN

Input voltage pin. 2.5V to 5.5V for internal circuitry.

Absolute Maximum Ratings

Input Voltage..............................................................6V

SW Voltage..............................................................36V

FB Voltage .................................................................6V

SHDN ........................................................................6V

OVP Voltage ............................................................36V

Operating Temperature Range ...............

-40°Cto85°C

Maximum Junction Temperature..........................125

°C

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed

in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

HT7937

Rev 1.10

2

January 18, 2010

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