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Data Sheet

FULL DATA SHEET (PDF, 568kB) Download   E-Mail

Description

The MAX722 and MAX723 CMOS power-supply ICs create dual regulated DC outputs for small, battery-operated microprocessor systems. Each device generates a main output (3V or 5V, selectable) and a negative auxiliary output that is adjustable for LCDs. Each device accepts two input voltages. Power can come from a main battery (two or three alkaline or NiCAD), or an unregulated DC source such as an AC-DC wall adapter. The MAX722/MAX723 provide three improvements over prior-art devices. Physical size is reduced; the high switching frequencies (up to 0.5MHz), made possible by MOSFET power transistors, allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is also improved to 87% (10% better than with low-voltage regulators made in bipolar technology). And supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation (PFM) control scheme. The MAX722 and MAX723 differ only in the lower fixed output voltage of the main regulator, with a 3.3V output for the MAX722 and a 3.0V output for the MAX723. For flash memory or PCMCIA applications that require a +12V output voltage, refer to the MAX717–721 data sheet.

Key Features		Applications/Uses
Low 0.9V to 5.5V Battery Input Range Unregulated 7V to 20V DC Input Range Dual Regulated Outputs Main Output: 3.3V/5V Auxiliary Output: 0V to -100V 87% Efficiency at 200mA Efficient PRAM Keep-Alive: 80% at 1mA 8W/in³ Power Density 60µA Quiescent Current 20µA Shutdown Mode with VREF Alive 500kHz Maximum Switching Frequency ±1.5% VREF Tolerance (Over Temp.) Detect Output Power Failures 16-Pin Narrow SO Packages		Bar-Code Scanners LCD Contrast Control Medical Instrumentation Palmtop Computers Portable Data Communicators Portable Data-Collection Equipment

Application Notes

Application Note 543: Switch-Mode Supply Charges Battery While Serving Load - MAX722

Design Guides

Temp Sensors (PDF)

Reliability Reports

none

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: 1-13 of 13
MAX722	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX722C/D			Land Pattern: Not Available		See data sheet
MAX722EVKIT-SO			Land Pattern: Not Available		See data sheet
MAX722CSE+			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX722CSE+T			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+1*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX722CSE			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX722CSE-T			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX722ESE			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX722ESE-T			Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX723	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX723C/D			Land Pattern: Not Available		See data sheet
MAX723CSE			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX723CSE-T			Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX723ESE			SOIC(N);16 pin;62 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX723ESE-T			Land Pattern: Not Available	-40°C to +85°C	See data sheet

Notes and Comments

Built-in switchover from main battery to plug-in adapter power, low-voltage warning

Related Products

MAX717, MAX717EVKIT, MAX718, MAX718EVKIT, MAX719, MAX719EVKIT, MAX720, MAX720EVKIT, MAX721, MAX721EVKIT 3.3V Palmtop Computer and Flash Memory Power Supply Regulator

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