MAX828 Datasheet, PDF (1/12 Pages) ON Semiconductor – Switched Capacitor Voltage Converters

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