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SP6642EU

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

Signal Processing Technologies 

PERFORMANCE CHARACTERISTICS (continued)

Refer to the circuit in Figure 25 with VBATT = 1.2V, R1 + R2 = 1MΩ, and TAMB = +25OC unless otherwise noted.

10msec/div

Figure 17. Shutdown Response and Inductor Current:

VOUT=3.3V, VBATT=1.2V, IOUT=5mA where

1: VOUT, 1V/div

2: SHDN, 2v/div

3: Inductor Current, 200mA/div

NAME

FUNCTION

PIN NUMBER

SP6642 SP6643

VBATT

Battery Supply. For the SP6643, this pin ties to the sensor input of the

BATTLO comparator.

1

1

PFI

Power-Fail Input. When the voltage on PFI drops below 614mV, PFO sinks

current.

2

2

BATTLO

Open-Drain Battery-LOW Output. When the voltage at VBATT drops below

1V, BATTLO sinks current.

-

3

PFO

Open-Drain Power-Fail Output. Sinks current when PFI drops below

614mV.

3

4

SHDN Active-LOW Shutdown Input. Connect to VBATT for normal operation.

4

-

Feedback Input. Input for adjustable-output operation. Connect this input

FB

pin to an external resistor voltage divider between VOUT and GND. Connect

5

5

to GND for fixed-output operation.

GND Connect to the lowest circuit potential, typically ground.

6

6

LX

Coil. An inductor is connected from VBATT to the N-Channel MOSFET switch

drain and the P-Channel synchronous-rectifier drain through this pin.

7

7

VOUT

Power Output. Feedback input for fixed 3.3V operation and IC power input.

Connect filter capacitor close to VOUT.

8

8

Table 1. SP6642/6643 Pin Descriptions

Rev. 10-6-00

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

8

© Copyright 2000 Sipex Corporation

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