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Optimized for Single Supply, 3V - 5.5V Applications

GL 1

14 BST

High Efficiency: Greater Than 95% Possible

PV

CC

2

13 GH

V

CC

3

Discontinuous Startup for Precharged Output

12 SWN

SP6128A

PGND 4

Accurate Fixed 300kHz Frequency Operation

11 I

SET

14 pin TSSOP

GND 5

10 V

FB

Fast Transient Response

COMP 6

NC

9

Internal Soft Start Circuit

NC 7

NC

8

Accurate 0.8V Reference Allows Low Output

Voltages

Now Available in Lead Free Packaging

Resistor Programmable Output Voltage

Resistor Programmable Overcurrent Threshold

APPLICATIONS

Loss-less Current Limit with High Side R

DS(ON)

鈻?/div>

DSP

Sensing

鈻?/div>

Microprocessor Core

Hiccup Mode Current Limit Protection

鈻?/div>

I/O & Logic

Dual N-Channel MOSFET Synchronous Driver

鈻?/div>

Industrial Control

Quiescent Current: 500碌A(chǔ), 30碌A(chǔ) in Shutdown

鈻?/div>

Distributed Power

14 pin TSSOP

鈻?/div>

Low Voltage Power

DESCRIPTION

The SP6128A is a fixed frequency, voltage mode, synchronous PWM controller designed to

work from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high

efficiency power conversion. Requiring only few external components, the SP6128A pack-

aged in an 14-pin TSSOP, is especially suited for low voltage applications where cost, small

size and high efficiency are critical. The operating frequency is internally set to 300kHz,

allowing small inductor values and minimizing PC board space. The SP6128A drives two

N-channel power MOSFETs for improved efficiency and includes an accurate 0.8V reference

for low output voltage applications.

TYPICAL APPLICATION CIRCUIT

3V to 5.5V

C5

10碌F

C6

10碌F

C7

10碌F

D1

MBR0530

R1

5

1

2

3

GL

BST

14

13

PV

CC

SP6128A

GH

12

V

CC

SWN

4

11

I

SET

PGND

5

6

7

GND

COMP

NC

V

FB

NC

10

9

8

C4

1碌F

R3

8k

Q1

FDS6690A

L1

1.0碌H

2.5V/10A

C1

2.2碌F

D2

STPS2L25U

Q2

FDS6690A

C12

4.7nF

R4

1.7k

C8

10碌F

C9

10碌F

C10

10碌F

C11

470碌F

C3

68pF

R5

800

R2

7.87k C2 4.7n

Rev. 08/19/05

SP6128A Low Voltage, Synchronous Step Down PWM Controller

1

型號(hào)

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