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CS5151GN16

CPU 4−Bit Nonsynchronous Buck Controller

ON Semiconductor 

PACKAGE PIN #

16 Lead SO Narrow & PDIP

1, 2, 3, 4

5

6, 12

7

8

9

10

11

13

14

15

16

CS5151

PACKAGE PIN DESCRIPTION

PIN SYMBOL

VID0−VID3

SS

NC

COFF

VFFB

VCC2

VGATE

PGND

VCC1

LGND

COMP

VFB

FUNCTION

Voltage ID DAC input pins. These pins are internally pulled

up to 5.0 V providing logic ones if left open. The DAC range

is 2.14 V to 3.54 V with 100 mV increments. VID0 − VID3

select the desired DAC output voltage. Leaving all 4 DAC

input pins open results in a DAC output voltage of 1.244 V,

allowing for adjustable output voltage, using a traditional

resistor divider.

Soft Start Pin. A capacitor from this pin to LGND in conjunc-

tion with internal 60 μA current source provides Soft Start

function for the controller. This pin disables fault detect func-

tion during Soft Start. When a fault is detected, the Soft Start

capacitor is slowly discharged by internal 2.0 μA current

source setting the time out before trying to restart the IC.

Charge/discharge current ratio of 30 sets the duty cycle for

the IC when the regulator output is shorted.

No Connection.

A capacitor from this pin to ground sets the time duration for

the on board one shot, which is used for the constant off time

architecture.

Fast feedback connection to the PWM comparator. This pin

is connected to the regulator output. The inner feedback loop

terminates on time.

Boosted power for the gate driver.

MOSFET driver pin capable of 1.5 A peak switching current.

High current ground for the IC. The MOSFET driver is refer-

enced to this pin. Input capacitor ground and the anode of

the Schottky diode should be tied to this pin.

Input power for the IC.

Signal ground for the IC. All control circuits are referenced to

this pin.

Error amplifier compensation pin. A capacitor to ground

should be provided externally to compensate the amplifier.

Error amplifier DC feedback input. This is the master voltage

feedback which sets the output voltage. This pin can be con-

nected directly to the output or a remote sense trace.

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