CS5156GN16 View Datasheet(PDF) - Cherry semiconductor

Part Name

Description

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CS5156GN16

CPU 5-Bit Nonsynchronous Buck Controller

Cherry semiconductor 

Electrical Characteristics: 0°C < TA < +70°C; 0°C < TJ < +85°C; 8V < VCC1 < 14V; 5V < VCC2 < 14V; DAC Code: VID4 = VID2 = VID1

= VID0 = 1; VID3 = 0; CVGATE = 1nF; COFF = 330pF; CSS = 0.1µF, unless otherwise specified.

PARAMETER

s Supply Current

ICC1

ICC2

Operating ICC1

Operating ICC2

TEST CONDITIONS

No Switching

No Switching

VFB = COMP = VFFB

VFB = COMP = VFFB

MIN

TYP

8.5

1.6

8

2

MAX

13.5

3.0

13

5

UNIT

mA

mA

mA

mA

s COFF

Normal Charge Time

Extension Charge Time

Discharge Current

VFFB = 1.5V; VSS = 5V

VSS = VFFB = 0

COFF to 5V; VFB >1V

1.0

1.6

2.2

µs

5.0

8.0

11.0

µs

5.0

mA

s Time Out Timer

Time Out Time

VFB = VCOMP; VFFB = 2V;

10

30

50

µs

Record VGATE Pulse High Duration

Fault Mode Duty Cycle

VFFB = 0V

35

50

65

%

Note 1: Guaranteed by design, not 100% tested in production.

PACKAGE PIN #

16L SO Narrow & PDIP

1,2,3,4,6

5

7

8

9

10

PIN SYMBOL

VID0 – VID4

SS

COFF

VFFB

VCC2

VGATE

Package Pin Description

FUNCTION

Voltage ID DAC input pins. These pins are internally pulled up to 5V

providing logic ones if left open. VID4 selects the DAC range. When VID4

is High (logic one), the DAC range is 2.14V to 3.54V with 100mV incre-

ments. When VID4 is Low (logic zero), the DAC range is 1.34V to 2.09V

with 50mV increments. VID0 - VID4 select the desired DAC output volt-

age. Leaving all 5 DAC input pins open results in a DAC output voltage

of 1.244V, allowing for adjustable output voltage, using a traditional

resistor divider.

Soft Start Pin. A capacitor from this pin to LGnd in conjunction with

internal 60µA current source provides soft start function for the con-

troller. This pin disables fault detect function during Soft Start. When a

fault is detected, the soft start capacitor is slowly discharged by internal

2µA 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.

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 1.5A peak switching current.

4

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