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MAX828SNTR

Switched Capacitor Voltage Converters

ON Semiconductor 

MAX828 MAX829

Switched Capacitor

Voltage Converters

The MAX828/829 are CMOS “charge–pump” voltage converters in

ultra–small SOT–23 5 lead packages. They invert and/or double an

input voltage which can range from +1.5V to +5.5V. Conversion

efficiency is typically >95%. Switching frequency is 12kHz for the

MAX828 and 35kHz for the MAX829.

External component requirement is only two capacitors (3.3µF

nominal) for standard voltage inverter applications. With a few

additional components a positive doubler can also be built. All other

circuitry, including control, oscillator, power MOSFETs are integrated

on–chip. Supply current is 50 µA (MAX828) and 115 µA (MAX829).

The MAX828 and MAX829 are available in a SOT–23 5 lead

surface mount package.

Features

• Charge Pump in SOT–23 5 Lead Package

• >95% Voltage Conversion Efficiency

• Voltage Inversion and/or Doubling

• Low 50 µA (MAX828) Quiescent Current

• Operates from +1.5V to +5.5V

• Up to 25 mA Output Current

• Only Two External Capacitors Required

• Tested Operating Temperature Range: –40°C to +85°C

Typical Applications

• LCD Panel Bias

• Cellular Phones

• Pagers

• PDAs, Portable Dataloggers

• Battery–Powered Devices

TYPICAL OPERATING CIRCUIT

+

C1

Voltage Inverter

C+

Vin

C–

GND

OUT

INPUT

V–

OUTPUT

C2

+

http://onsemi.com

SOT–23–5

SN SUFFIX

CASE TBD

PRELIMINARY INFORMATION

PIN CONFIGURATION

(Top View)

OUT 1

5 C+

Vin 2

C– 3

4 GND

SOT–23–5*

NOTE: *SOT–23–5 is equivalent to EIAJ–SC74A

ORDERING INFORMATION

Device

Package

Shipping

MAX828SNTR SOT–23–5 3000 Tape/Reel

MAX829SNTR SOT–23–5 3000 Tape/Reel

© Semiconductor Components Industries, LLC, 1999

1

February, 2000 – Rev. 0

Publication Order Number:

MAX828/D

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