NX2113/2113A

4

Rev. 2.0

11/18/05

PIN DESCRIPTIONS

PIN #

PIN SYMBOL

PIN DESCRIPTION

This pin supplies voltage to the high side driver. A high frequency

ceramic capacitor of 0.1 to 1 uF must be connected from this pin to SW pin.

High side MOSFET gate driver.

Power and analog ground pin. For MLPD package, analog ground and power ground

are separated, additional pad pin(11) is available for analog ground.

Low side MOSFET gate driver.

Ldrv supply voltage. A 1uF high frequency cap must be connected from this pin to

GND directly.

Voltage supply for the internal circuit as well as the low side MOSFET gate driver. A

1uF high frequency ceramic capacitor must be connected from this pin to GND pin.

Pull up this pin to Vcc for normal operation. Pulling this pin down below 1.25V

shuts down the controller and resets the soft start. This pin can also be used as

a UVLO detector for the bus voltage via a resistor divider.

This pin is the error amplifier inverting input. This pin is also connected to the output

UVLO comparator. When this pin falls below 0.4V, both HDRV and LDRV outputs

are latched off.

This pin is the output of the error amplifier and together with FB pin is used to

compensate the voltage control feedback loop.

This pin is connected to the source of the high side MOSFET and provides return

path for the high side driver.

1

BST

2

HDRV

3

PGND/Gnd

4

LDRV

5

PVcc

6

Vcc

7

EN

8

FB

9

COMP

10

SW