SP6652EU(2004) View Datasheet(PDF) - Signal Processing Technologies

Part Name

Description

Manufacturer

SP6652EU
(Rev.:2004)

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

Signal Processing Technologies 

®

SP6652

1A, High Efficiency, High Frequency Current Mode PWM

Buck Regulator

FEATURES

■ 1A Output Current

■ 1.2MHz Constant Frequency Operation

■ 97% Efficiency Possible

■ Pin Selectable Forced PWM or PWM/PFM Modes

PGND 1

SGND 2

FB 3

COMP 4

SP6652

10 Pin MSOP

10 LX

9 PVIN

8 SVIN

7 SYNC

■ Ultra Low Quiecent Current in PFM Mode: 50µA

SD 5

6 MODE

■ 500nA (Max.) Shutdown Current

■ Output Adjustable Down to 0.75V

Now Available in Lead Free Packaging

■ No External FET's or Schottky Diode Required

■ Uses Small Value Inductors and Ceramic

Output Capacitors

■ Low Dropout Operation: 100% Duty Cycle

■ Soft Start and Thermal Shutdown Protection

■ Easy Frequency Synchonization

■ Small 10 Pin MSOP and 10 Pin DFN Package

APPLICATIONS

■ Mobile Phones

■ PDA's

■ DSC's

■ MP3 Players

■ USB Devices

■ 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.

VOUT

3.3V at 1A

340k

100k

10µF

TYPICAL APPLICATION SCHEMATIC

4.7µF

1 PGND

LX 10

2 SGND

PVIN 9

3 FB

SP6652 SVIN 8

4

COMP

7

SYNC

8k

5

SD

6

MODE

VIN

10µF

6.2nF

ENABLE

SHUTDOWN

Date:5/25/04

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

1

© Copyright 2004 Sipex Corporation

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