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CS5156GN16

CPU 5−Bit Nonsynchronous Buck Controller

ON Semiconductor 

CS5156

ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < +70°C; 0°C < TJ < +85°C; 8.0 V < VCC1 < 14 V; 5.0 V < VCC2 < 14 V;

DAC Code: VID4 = VID2 = VID1 = VID0 = 1; VID3 = 0; CVGATE = 1.0 nF; COFF = 330 pF; CSS = 0.1 μF, unless otherwise specified.)

Characteristic

Test Conditions

Min

Typ

Max

Unit

Supply Current

ICC1

ICC2

Operating ICC1

Operating ICC2

COFF

Normal Charge Time

Extension Charge Time

Discharge Current

Time Out Timer

Time Out Time

No Switching

No Switching

VFB = COMP = VFFB

VFB = COMP = VFFB

VFFB = 1.5 V; VSS = 5.0 V

VSS = VFFB = 0

COFF to 5.0 V; VFB > 1.0 V

VFB = VCOMP; VFFB = 2.0 V;

Record VGATE Pulse High Duration

−

8.5

13.5

mA

−

1.6

3.0

mA

−

8.0

13

mA

−

2.0

5.0

mA

1.0

1.6

2.2

μs

5.0

8.0

11.0

μs

5.0

−

−

mA

10

30

50

μs

Fault Mode Duty Cycle

VFFB = 0V

35

50

65

%

PACKAGE PIN #

SO−16, DIP−16

1, 2, 3, 4, 6

5

7

8

9

10

11

12

13

14

15

16

PACKAGE PIN DESCRIPTION

PIN SYMBOL

VID0−VID4

SS

COFF

VFFB

VCC2

VGATE

PGND

NC

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. VID4 selects the DAC range. When VID4 is High (logic

one), the DAC range is 2.14 V to 3.54 V with 100 mV increments. When VID4 is

Low (logic zero), the DAC range is 1.34 V to 2.09 V with 50 mV increments. VID0

− VID4 select the desired DAC output voltage. Leaving all 5 DAC input pins open

results in a DAC output voltage of 1.244 V, allowing for adjustable output volt-

age, using a traditional resistor divider.

Soft Start Pin. A capacitor from this pin to LGND in conjunction with internal 60 μA

current source provides Soft Start function for the controller. This pin disables fault

detect function 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.

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 referenced to this pin. Input

capacitor ground and the anode of the Schottky diode should be tied to this pin.

No connection.

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 exter-

nally to compensate the amplifier.

Error amplifier DC feedback input. This is the master voltage feedback which sets

the output voltage. This pin can be connected directly to the output or a remote

sense trace.

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