Switched-Capacitor Voltage Inverters - Maxim
Description
19-0495; Rev 3; 9/99
Switched-Capacitor Voltage Inverters
General Description
The ultra-small MAX828/MAX829 monolithic, CMOS charge-pump inverters accept input voltages ranging from +1.
5V to +5.
5V.
The MAX828 operates at 12kHz, and the MAX829 operates at 35kHz.
Their high efficiency (greater than 90% over most of the load-current range) and low operating current (60µA for the MAX828) make these devices ideal for both battery-powered and boardlevel voltage-conversion applications.
The MAX828/MAX829 combine low quiescent current and high efficiency.
Oscillator control circuitry and four power MOSFET switches are included on-chip.
Applications include generating a -5V supply from a +5V logic supply to power analog circuitry.
Both parts come in a 5-pin SOT23-5 package and can deliver 25mA with a voltage drop of 500mV.
For a similar device with logic-controlled shutdown, refer to the MAX1719/MAX1720/MAX1721.
For applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX package.
o 5-Pin SOT23-5 Package o 95% Voltage Conversion Efficiency o Inverts Input Supply Voltage o 60µA Quiescent Current (MAX828) o +1.
5V to +5.
5V Input Voltage Range o Requires Only Two Capacitors o 25mA Output Current
Features
MAX828/MAX829
Ordering Information
PART MAX828EUK MAX829EUK TEMP.
RANGE -40°C to +85°C -40°C to +85°C PINPACKAGE 5 SOT23-5 5 SOT23-5 SOT TOP MARK AABI AABJ
Applications
Small LCD Panels Cell Phones Medical Instruments Handy-Terminals, PDAs Battery-Operated Equipment
Typical Operating Circuit
TOP VIEW
5 C1+ IN 2 INPUT SUPPLY VOLTAGE OUT 1
Pin Configuration
MAX828 MAX829
3 C1OUT 4 1 NEGATIVE OUTPUT VOLTAGE
5
C1+
IN
2
MAX828 MAX829
4 GND
C1-
3
GND
SOT23-5
NEGATIVE VOLTAGE CONVERTER
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