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廬

SP6652

1A, High Efficiency, High Frequency Current Mode PWM

Buck Regulator

FEATURES

P

GND

1

10

LX

鈻?/div>

1A Output Current

S

GND

2

9

P

VIN

SP6652

鈻?/div>

1.2MHz Constant Frequency Operation

8

S

VIN

FB

3

鈻?/div>

97% Efficiency Possible

10 Pin MSOP

7

SYNC

COMP

4

鈻?/div>

Pin Selectable Forced PWM or PWM/PFM Modes

6

MODE

SD

5

鈻?/div>

Ultra Low Quiecent Current in PFM Mode: 50碌A(chǔ)

鈻?/div>

500nA (Max.) Shutdown Current

Now Available in Lead Free Packaging

鈻?/div>

Output Adjustable Down to 0.75V

鈻?/div>

No External FET's or Schottky Diode Required

APPLICATIONS

鈻?/div>

Uses Small Value Inductors and Ceramic

鈻?/div>

Mobile Phones

Output Capacitors

鈻?/div>

PDA's

鈻?/div>

Low Dropout Operation: 100% Duty Cycle

鈻?/div>

DSC's

鈻?/div>

Soft Start and Thermal Shutdown Protection

鈻?/div>

MP3 Players

鈻?/div>

Easy Frequency Synchonization

鈻?/div>

USB Devices

鈻?/div>

Small 10 Pin MSOP and 10 Pin DFN Package

鈻?/div>

Point of Use Power

DESCRIPTION

The SP6652 is high efficiency, synchronous buck regulator ideal for portable applications using

one Li-Ion cell, with up to 1A output current. The 1.2MHz switching frequency and PWM control

loop are optimized for small value inductor and ceramic output capacitor, for space constrained

portable designs. At light load, the SP6652 can operate in either PFM mode for high efficiency,

or PWM mode for constant frequency. In addition, the input voltage range of 2.7V to 5.5V;

excellent transient response, output accuracy, and ability to transition into 100% duty cycle

operation, further extending useful battery life, make the SP6652 a superior choice for a wide

range of portable power applications. The output voltage is externally programmable down to

0.75V. A logic level shutdown control, external clock synchronization, and forced-PWM or

automatic control inputs are provided. Other features include soft-start, over current protection

and 140(C over-temperature shutdown.

TYPICAL APPLICATION SCHEMATIC

V

OUT

3.3V at 1A

340k

4.7碌F

1

2

3

4

5

P

GND

S

GND

FB

COMP

SD

LX

P

VIN

SP6652

S

VIN

SYNC

MODE

100k

10碌F

8k

10

9

8

7

6

V

IN

10碌F

6.2nF

ENABLE

SHUTDOWN

Date:5/25/04

SP6652 1A, High Efficiency, High Frequency Current Mode PWM Buck Regulator

1

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