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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 168kB) Download   E-Mail

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-frequency-modulation (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 full-load 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 µMAX® package, which is only 1.11mm high and occupies just half the board area of a standard 8-pin SO.

Key Features		Applications/Uses
Regulated Negative Output Voltage (up to -2 x VIN) Ultra-Small, 10-Pin µMAX Package On-Demand Switching at up to 450kHz 30µA Quiescent Supply Current Requires Only Four Small External Capacitors 1.8V to 5.5V Input Voltage Range 0.1µA Logic-Controlled Shutdown Up to 30mA Output Current Adjustable output voltage		Battery-Powered Applications Camcorders Cell Phones Cordless Phones Handy-Terminals, PDAs Medical Instruments Small LCD Panels

Diagram

Typical Operating Circuit

Application Notes

Application Note 239: Regulated LCD-Bias Generator Requires No Inductor - MAX868 Application Note 725: DC-DC Conversion Without Inductors - MAX868 Application Note 1845: Choosing the Right DC-DC Converter for Automotive Applications - MAX868 Application Note 1876: Doubler/Inverter Charge Pumps Divide by Two - MAX868

Reliability Reports

Reliability Report: MAX868.pdf Show FIT data for: MAX868

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-4 of 4

MAX868	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX868EUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX868EUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX868EUB+			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX868EUB+T			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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