SP682 Datasheet, PDF (1/8 Pages) Sipex Corporation – Ultra-Low Power Inverting Voltage Doubler

Corporation
SP682
Micro Power Inverting Charge Pump
■ Low Power Voltage Conversion
■ +2.4V to +5.5V Input Range
■ 99% Voltage Conversion Efficiency
■ Typical 60µA Supply Current
■ Requires Only Three External Capacitors
■ Includes Low Power Shutdown Option
■ Ideal in Portable Applications Such As
Handheld Instruments
Cellular Phones
Personal Digital Assistants
Laptops and Notebooks
■ Pin Compatible Upgrade to Microchip's
TC682
C1- 1
C2+ 2
C2- 3
VOUT 4
SP682
8 Pin MSOP
8 SD
7 C1+
6 VCC
5 GND
APPLICATIONS
■ LCD Display
■ Negative bias supply for op amps
■ Serial interface protocol circuits
DESCRIPTION
The SP682 is a monolithic charge pump voltage converter that produces a doubled, negative
voltage from a single positive supply. The SP682 charge pump outputs a –10V voltage from
a +5V input. Three external charge pump capacitors are required to support the voltage
conversion and voltage doubling process. An internal oscillator generates a 12kHz clock
which cycles the internal switching that charges the storage and transfer capacitors. The
charge pump architecture is fabricated using a low power BiCMOS process technology.
The SP682 charge pump is ideal for low power applications requiring a typical +3V battery
source such as a lithium cell. Typical applications are handheld instruments, notebook and
laptop computers, cellular phones, and data acquisition or GP systems. The SP682 is
packaged in either 8-pin NSOIC, 8-pin MSOP for surface mount applications, and 8 Pin PDIP.
TYPICAL APPLICATION CIRCUIT
+2.4V to +5V
1µF
+
6
7
V_CC
C1+
C1
V_{OUT 4}
1 _C1–
2
SP682
C2+
C2
3 _C2–
GND
5
SD ₈
- V_OUT
C_OUT
Date: 5/20/04
SP682 Micro Power Inverting Charge Pump
1
© Copyright 2004 Sipex Corporation