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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 208kB) Download   E-Mail

Description

The MAX686 DAC-controlled boost/inverter IC converts a positive input voltage to a positive or negative LCD bias voltage up to +27.5V or -27.5V. The device features an internal N-channel MOSFET switch, programmable current limiting, and an internal 6-bit digital-to-analog converter (DAC) for digital adjustment of the output voltage. It comes in a small 16-pin QSOP package (same size as an 8-pin SO). The MAX686 uses a current-limited, pulse-frequency-modulation (PFM) control scheme to provide high efficiency over a wide range of load conditions. Its high switching frequency (up to 300kHz) allows the use of small external components. An LCDON output allows the LCD bias voltage to be automatically disabled when the display logic voltage is removed, protecting the display. The MAX686 has a +2.7V to +5.5V input voltage range for the IC, and a +0.8V to +27.5V input voltage range for the inductor. Typical quiescent supply current is 65µA. Shutdown current is 1.5µA. The MAX686 offers high-level integration to save space, reduce power consumption, and increase battery life, making it an excellent choice for battery-powered portable equipment. The MAX629 is similar to the MAX686, except that it does not contain a built-in DAC. Both devices have evaluation kits to facilitate designs.

An evaluation kit is available:  MAX686EVKIT  

Key Features		Applications/Uses
Internal 500mA, 28V N-Channel Switch (no external FET required) Adjustable Output Voltage to +27.5V or -27.5V 6-Bit DAC-Controlled Output Voltage Up to 90% Efficiency Small 16-Pin QSOP Package (Same size as 8-pin SO) Power-OK Indicator 65µA Quiescent Current 1.5µA Shutdown Current Up to 300kHz Switching Frequency		Notebook Computers Palmtop Computers PDAs and Other Handheld Devices Portable Data-Collection Terminals Positive or Negative LCD Bias Varactor Tuning Diode Bias

Diagram

Typical Operating Circuit

Evaluation Kits

MAX686EVKIT

Reliability Reports

Show FIT data for: MAX686 Request Reliability Report for: MAX686

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: 1-5 of 5

MAX686	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX686C/D			Active	DICE SALES;NA pin;0 mm² Land Pattern: Not Applicable Use pkgcode/variation: DICE*		See data sheet
MAX686EEE			Active	QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX686EEE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX686EEE+			Active	QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX686EEE+T			Active	QSOP;16 pin;31 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes and Comments

30V/0.5A internal switch reduces component count and saves space

Related Products

MAX629 28V, Low-Power, High-Voltage, Boost or Inverting DC-DC Converter More Like This: View Product Families for Similar Products See All Inverting Switching Regulators (25 Products) See All Step-Up Switching Regulators (94 Products)

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