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SP6642EU

Single Alkaline Cell, High Efficiency Step-Up DC-DC Converter

Signal Processing Technologies 

®

SP6642/6643

Single Alkaline Cell, High Efficiency

Step-Up DC-DC Converter

s 20mA Output Current at 1.2V Input

s +2V to +5.5V Output Range

s 0.85V Guaranteed Start-Up

s 83% High Efficiency

s

1.5µA

Quiescent

Supply

Current

at

V

BATT

s Reverse Battery Protection

s Internal Synchronous Rectifier

s 5nA Logic Controlled Shutdown Current

From VBATT For The SP6642

s Low-Battery Detection Active LOW

Output For The SP6643

s Extremely Small µSOIC Package

s Pin-to-pin Compatible With MAX1642

And MAX1643

DESCRIPTION

The SP6642/6643 devices are high-efficiency, low-power step-up DC-DC converters for +1V

inputs ideal for single alkaline cell applications such as pagers, remote controls, and other

low-power portable end products. Designers can control the SP6642 device with a 1nA active

LOW shutdown input. The SP6643 features an active LOW output for low-battery conditions.

Both devices contain a 0.8Ω synchronous rectifier, an oscillator, a 0.6Ω N-channel MOSFET

power switch, an internal voltage reference, circuitry for pulse-frequency-modulation, and an

under voltage comparator. The output voltage for the SP6642/6643 devices is preset to

+3.3V + 4% or can be adjusted from +2V to +5.5V by manipulating two external resistors.

VBATT 1

PFI 2

PFO 3

SHDN 4

SP6642

8 VOUT

7 LX

6 GND

5 FB

VBATT 1

PFI 2

BATTLO 3

PFO 4

SP6643

8 VOUT

7 LX

6 GND

5 FB

Rev. 10-6-00

SP6642/6643 High Efficiency Step-Up DC-DC Converter

1

© Copyright 2000 Sipex Corporation

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