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CS5155GN16

CPU 5−Bit Synchronous Buck Controller

ON Semiconductor 

CS5155

ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < +70°C; 0°C < TJ < +85°C; 8.0 V < VCC1 < 14 V; 5.0 V < VCC2 < 20 V; DAC

Code: VID4 = VID2 = VID1 = VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 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(H) 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(H)

PGND

VGATE(L)

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 voltage, using a traditional resistor divider.

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

rent 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 dis-

charged 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 high side gate driver.

High FET driver pin capable of 1.5 A peak switching current. Internal circuit prevents

VGATE(H) and VGATE(L) from being in high state simultaneously.

High current ground for the IC. The MOSFET driver is referenced to this pin. Input capac-

itor ground and the source of lower FET should be tied to this pin.

Low FET driver pin capable of 1.5 A peak switching current.

Input power for the IC and low side gate driver.

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 connected directly to the output or a remote sense trace.

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