1

Rev:001 Date:11/20/03

SP6649 Ultra-low Quiescent Current, High Efficiency Boost DC-DC Regulator

© Copyright 2002 Sipex Corporation

SP6649

FEATURES

■ Ultra-low 12µA Quiescent Current

■ 94% Efficiency Possible

■ Wide Input Voltage Range: 0.85V to 4.5V

■ 3.3V Fixed Output and adjustable 2.5V to

5.0V Output Range

■ Internal Synchronous Rectifier for High

Efficiency

■ 0.3 Charging Switch, 0.3 Synchro-

nous Rectifier

■ Anti-Ringing Inductor Switch

■ Programmable Inductor Peak Current

■ Logic Shutdown Control

■ Under Voltage Lock-Out, 0.62V

■ Programmable Low Battery Detect

■ Small 10 pin MSOP Package

Ultra-low Quiescent Current,

High Efficiency Boost DC-DC Regulator

APPLICATIONS

■ Digital Still Cameras

■ MP3 Players

■ PDA's

■ Pagers

■ Handheld Portable Devices

■ Medical Monitors

DESCRIPTION

The SP6649 is an ultra-low quiescent current, high efficiency step-up DC-DC converter ideal for

single and dual cell alkaline, or Li-Ion battery applications such as digital still cameras, PDA’s,

MP3 players, and other portable devices. The SP6649 combines the high delivery associated

with PWM control, and the low quiescent current and excellent light-load efficiency of PFM control.

The SP6649 features 12µA quiescent current, synchronous rectification, a 0.3 charging switch,

anti-ringing inductor switch, programmable low battery detect, under-voltage lockout and

programmable inductor peak current. The device can be controlled by a 1nA active LOW

shutdown pin.

®

1

2

3

4

5

10

9

8

7

6

LBI

LBON

SHDN

LX

GND

FB

Top View

10 pin MSOP

Tja=113

°C/W

+

C1

47uF

L1 10uH

VBATT

C3

47pF

LBI

SHDN

R1

205K

47uF

RLIM

1.87K

3.3Vout

R2

124K

C4

1uF

SP6649

1

2

4

5

6

7

8

3

9

10

VBATT

LBI

RLIM

SHDN

FB

GND

PGND

LBON

LX

VOUT

LBON

C1 = C2 = Kemet T49C476K010AS, L1 = Sumida CDRH5D28-100

Figure 1. Typical Application Circuit

Figure 2. Maximum Load Current in Operation

TBD