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L6996

PIN FUNCTIONS

N

Name

Description

1,2,3,

23,24

VID4-0

Voltage Identification inputs. VID0 is the LSB and VID4 is the MSB for the DAC (see VID table)

4

CS-

This pin is used for both current sensing and to detect overvoltage and undervoltage

conditions.

5

CS+

Current sense pin. Overcurrent condition is detected by sensing CS+ to CS- voltage.

6

VCC

Supply voltage for analogy blocks. Connect it to 5V bus.

7

GND

Signal ground

8

VPROG

DAC output voltage. This pin provides the voltage programmed by the DAC. Connect a 10nF

capacitor between this pin and GND.

9

VFB+

PWM comparator reference input. Connect this pin to VPROG.

An additional external voltage divider between output and VPROG may be used to realize the

active droop function.

10

VFB-

PWM comparator feedback input, to be connected to the regulated output.

By inserting a resistor between this pin and the regulated output, a positive offset can be

added to the output voltage.

11

OSC

Connect this pin to the battery through a voltage divider in order to provide the voltage

feedforward feature.

12

SS

Soft start pin. 5

µA constant current charges an external capacitor whose value sets the soft-

start time.

13

ILIM

An external resistor connected between this pin and GND sets the current limit threshold.

14

SHDN

ShutDown input. When connected to GND the device stops working. When high, it enables

the IC operation.

15

OVP

Open drain output. The pull-down transistor is off either in OV condition or during a VID

transition.

16

PGOOD

Open drain output. The pull-down transistor is on during soft-start, dynamic transitions and

when an output voltage fault occurs.

17

PGND

Power Ground. This pin has to be connected close to the low side MOSFET source in order to

minimize switching noise.

18

LGATE

Lower MOSFET gate driver output.

19

Voltage supply for the low side internal driver.

20

PHASE

This pin provides the return path of the high side driver.

21

HGATE

High side MOSFET driver output.

22

BOOT

Bootstrap capacitor pin. The high side driver is supplied through this pin.