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Part Number: MAX868
Description: The MAX868 inverting charge pump provides a low-cost and compact means of generating a regulated negat...
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MAX868
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DataSheet
General Description
MAX868 General Description
The MAX868 inverting charge pump provides a low-cost and compact means of generating a regulated negative voltage up to -2 x VIN from a positive input voltage between 1.8V and 5.5V. It uses a pulse-frequencymodulation (PFM) control scheme to generate the regulated negative output voltage. PFM operation is obtained by gating the internal 450kHz oscillator on and off as needed to maintain output voltage regulation. This unique on-demand switching scheme gives the MAX868 excellent light-load efficiency without degrading its fullload operation (up to 30mA), permitting smaller capacitors to take advantage of the oscillator's high switching frequency.
The MAX868 requires no inductors; only four capacitors are required to build a complete DC-DC converter. Output voltage regulation is achieved by adding just two resistors. The MAX868 comes in a 10-pin MAX package, which is only 1.11mm high and occupies just half the board area of a standard 8-pin SO.
MAX868 Maximum Ratings
IN to GND.................................................................-0.3V to +6V
OUT to GND ...........................................................+0.3V to -12V
IN to OUT.................................................................-0.3V to -17V
C1+ to GND ........................................(VIN - 12V) to (VIN + 0.3V)
C1- to GND.............................................................+0.3V to -12V
C2+ to GND.....................................................(VIN + 0.3V) to -6V
C2- to GND................................................................+0.3V to -6V
SHDN, FB to GND .........................................-0.3V to (VIN + 0.3V)
PGND to GND .........................................................-0.3V to +0.3V
Output Current ...................................................................35mA
Short-Circuit Duration.................................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-pin MAX (derate 5.6mW/°C above +70°C) ..........444mW
Operating Temperature Range
MAX868EUB ....................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
OUT to GND ...........................................................+0.3V to -12V
IN to OUT.................................................................-0.3V to -17V
C1+ to GND ........................................(VIN - 12V) to (VIN + 0.3V)
C1- to GND.............................................................+0.3V to -12V
C2+ to GND.....................................................(VIN + 0.3V) to -6V
C2- to GND................................................................+0.3V to -6V
SHDN, FB to GND .........................................-0.3V to (VIN + 0.3V)
PGND to GND .........................................................-0.3V to +0.3V
Output Current ...................................................................35mA
Short-Circuit Duration.................................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-pin MAX (derate 5.6mW/°C above +70°C) ..........444mW
Operating Temperature Range
MAX868EUB ....................................................-40°C to +85°C
Storage Temperature Range ...........................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
MAX868 Features
` Regulated Negative Output Voltage
(up to -2 x VIN)
` Ultra-Small, 10-Pin MAX Package
` On-Demand Switching at up to 450kHz
` 30A Quiescent Supply Current
` Requires Only Four Small External Capacitors
` 1.8V to 5.5V Input Voltage Range
` 0.1A Logic-Controlled Shutdown
` Up to 30mA Output Current
(up to -2 x VIN)
` Ultra-Small, 10-Pin MAX Package
` On-Demand Switching at up to 450kHz
` 30A Quiescent Supply Current
` Requires Only Four Small External Capacitors
` 1.8V to 5.5V Input Voltage Range
` 0.1A Logic-Controlled Shutdown
` Up to 30mA Output Current
MAX868 Typical Application
·Small LCD Panels
·Cell Phones
·Cordless Phones
·Camcorders
·Handy-Terminals, PDAs
·Medical Instruments
·Battery-Operated Equipment
·Cell Phones
·Cordless Phones
·Camcorders
·Handy-Terminals, PDAs
·Medical Instruments
·Battery-Operated Equipment
MAX868 Connection Diagram
MAX868
PDF/DataSheet Download
- Datasheet: MAX868
- File Size: 156332 KB
- Manufacturer: Maixm
- Click here to Download
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