LT3482

5

3482fa

PI FU CTIO S

APD (Pin 2): Connect APD cathode to this pin.

MONIN (Pin 3): Current Monitor Power Supply Pin. An

external lowpass filter can be included here to further

reduce supply voltage ripple.

divider to the FB pin and GND.

this pin and the GND plane. Minimize the length of the

trace to the capacitor.

PUMP (Pin 6): Charge Pump Pin. Put a 50V rating bypass

capacitor between SW and PUMP to form a complete volt-

age doubler with the internal integrated Schottky diodes.

Minimize trace length to the capacitor.

SW (Pins 7, 8): Switch Pin. Minimize the trace length on

this pin to reduce EMI.

GND (Pins 9, 10): Ground. Pins connected internally. For

best performance, connect both pins to board ground.

bypassed.

SHDN (Pin 12): Shutdown Pin. Tie to 1.5V or higher to

enable device; 0.4V or less to disable device. This pin also

functions as soft-start between 1.5V and 2V.

CTRL (Pin 13): Internal Reference Override Pin. This allows

the FB voltage to be externally set between 0V and 1.2V.

Tie this pin higher than 1.5V to use the internal reference

of 1.235V.

FB (Pin 14): Feedback Pin. Connect the output resistor

divider tap here.

pin to above 1.5V or higher to select the higher switching

frequency of 1.1MHz. For lower switching frequency, tie

to GND.

MON (Pin 16): Current Monitor Output Pin. It sources a

current equal to 20% of the APD current and converts to

a reference voltage through an external resistor.

Exposed Pad (Pin 17): GND. This pin must be soldered

to the PCB.