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L6996

DINAMICALLY PROGRAMMABLE SYNCHRONOUS STEP DOWN CONTROLLER FOR MOBILE CPUs

STMicroelectronics 

L6996

PIN FUNCTIONS

N

Name

1,2,3,

23,24

VID4-0

4

CS-

5

CS+

6

VCC

7

GND

8

VPROG

9

VFB+

10

VFB-

11

OSC

12

SS

13

ILIM

14

SHDN

15

OVP

16

PGOOD

17

PGND

18

LGATE

19

VDR

20

PHASE

21

HGATE

22

BOOT

Description

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

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

conditions.

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

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

Signal ground

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

capacitor between this pin and GND.

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.

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.

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

feedforward feature.

Soft start pin. 5µA constant current charges an external capacitor whose value sets the soft-

start time.

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

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

the IC operation.

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

transition.

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

when an output voltage fault occurs.

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

minimize switching noise.

Lower MOSFET gate driver output.

Voltage supply for the low side internal driver.

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

High side MOSFET driver output.

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

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