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CS5157GD16

CPU 5-Bit Synchronous Buck Controller

Cherry semiconductor 

PACKAGE PIN #

16L SO Narrow

11

12

13

14

15

16

Package Pin Description: continued

PIN SYMBOL

FUNCTION

PGnd

VGATE(L)

VCC1

LGnd

COMP

VFB

High current ground for the IC. The MOSFET drivers are referenced to

this pin. Input capacitor ground and the source of lower FET should be

tied to this pin.

Low FET driver pin capable of 1.5A 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.

Block Diagram

VCC1

SS

VID0

VID1

VID2

VID3

VID4

VFB

COMP

VFFB

LGnd

VCC1 Monitor

Comparator

-

+

3.90V

3.85V

5V

60µA

2µA

5 BIT

DAC

Error

+ Amplifier

-

Slow Feedback

PWM

Comparator

-

+

Fast Feedback

-

+

VFFB Low

1V

Comparator

PWM

COMP

2.5V

SS Low

- Comparator

+

0.7V

SS High

+ Comparator

-

Maximum

On-Time

Timeout

Normal

Off-Time

Timeout

Extended

Off-Time

Timeout

FAULT

R

Q

S

Q FAULT

FAULT

Latch

VCC2

VGATE(H)

PGnd

VCC1

VGATE(L)

PGnd

R

Q

S

Q

PWM

Latch

Off-Time

Timeout

GATE(H) = ON

GATE(H) = OFF

COFF

One Shot

R

S

Q

COFF

Time Out

Timer

(30µs)

Edge Triggered

5

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