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Data Sheet

FULL DATA SHEET (PDF, 304kB) Download   E-Mail

Description

The MAX1684/MAX1685 are high-efficiency, internal-switch, pulse-width modulation (PWM) step-down switching regulators intended to power cellular phones, communicating PDAs, and handy-terminals. These devices deliver a guaranteed 1A output current from two lithium-ion (Li+) batteries. Their wide-input voltage range of 2.7V to 14V gives design flexibility and allows batteries to charge from a wall cube, since the ICs operate at the higher voltages that occur when the battery is removed. The output voltage is preset to 3.3V or can be externally adjusted from 1.25V to VIN. The low on-resistance power switch and built-in synchronous rectifier provide high efficiencies of up to 96%. There are four modes of operation: fixed-frequency, normal, low-power, and shutdown. The fixed-frequency PWM mode of operation offers excellent noise characteristics. The normal mode maintains high efficiency at all loads. The low-power mode is used to conserve power in standby or when full load is not required. The shutdown mode is used to power down the device for minimal current draw. The MAX1684 runs at 300kHz for applications that require highest efficiency. The MAX1685 runs at 600kHz to allow the use of smaller external components. These devices can also be synchronized to an external clock. Other features include a 100% duty cycle for low-dropout applications, an auxiliary 3V/5mA output, and a 1% accurate reference. Both devices are available in a space-saving 16-QSOP package. An evaluation kit is also available to help speed designs. For a similar device in a 10-pin µMAX® package with lower input voltage requirements (5.5V max), refer to the MAX1692 data sheet.

Key Features		Applications/Uses
Up to 96% Efficiency 1A Guaranteed Output Current 100% Duty Cycle in Dropout 2.7V to 14V Input Range (15V Absolute Max) ±1% Accurate Reference Output 0.24Ω P-Channel On-Resistance Synchronizable Switching Frequency Fixed-Frequency PWM Operation 300kHz (MAX1684) 600kHz (MAX1685) 150µA Normal-Mode Quiescent Current 25µA Low-Power Mode Quiescent Current 2µA Shutdown Current Dual Mode™ Fixed 3.3V (±1%) Output or Adjustable Output (1.25V to VIN) Small 16-QSOP Package Auxiliary Output (CVL): 3V/5mA		Cell Phones Computer Peripherals PDAs and Handy-Terminals Personal Communicators Two-Way Radios and Walkie-Talkies

Diagram

Typical Operating Circuit

Application Notes

Application Note 1187: Chip Recorder Customizes Phone Ringer - MAX1684 Application Note 2018: Protection From Blackouts: Dirt Cheap to Fully Integrated - MAX1684

Evaluation Kits

MAX1685EVKIT

Reliability Reports

Show FIT data for: MAX1684 MAX1685 Request Reliability Report for: MAX1684 MAX1685

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: 1-8 of 8
MAX1684	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1684EEE			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1684EEE-T			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1684EEE+			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1684EEE+T			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1685	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1685EEE			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1685EEE-T			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1685EEE+			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1685EEE+T			QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes and Comments

Low-Noise operation, Low-Power mode, 1A guaranteed output current

More Information

MAX1685Power Supply Cookbook

Related Products

MAX1692 Low-Noise, 5.5V Input, PWM Step-Down Regulator

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