MAX685

PRODUCTION

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD

Data Sheet (Rev. 1) Product Selection Table

Part Models: 3
1ku List Price: Starting From $5.24

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Overview

Dual Output Using a Single Inductor
Low-Noise Output, 30mVp-p Ripple
Output Voltages up to 24V and down to -9V (up to 45V and down to -16V with added components)
Internal Switches in a Small 24-Pin 4mm x 4mm Thin QFN Package
220kHz/400kHz Fixed-Frequency PWM Operation
Frequency Can Be Synchronized to External Clock
Power-OK Indicator
Selectable Power-On Sequencing
0.1µA Logic-Controlled Shutdown

The MAX685 DC-DC converter provides low-noise dual outputs for powering CCD imaging devices and LCDs. This device uses a single inductor to provide independently regulated positive and negative outputs. Integrated power switches are included in a small 24-Pin 4mm x 4mm Thin QFN package to save space and reduce cost. A 16-pin QSOP package is also available.

Each output delivers up to 10mA from a +2.7V to +5.5V input voltage range. Output voltages are set independently up to 24V and down to -9V. With a few additional low-cost components, the output voltages can be set at up to 45V and down to -16V. Output ripple magnitude is 30mVp-p. The MAX685 uses a fixed-frequency, pulse-width-modulated (PWM) control scheme at 220kHz or 400kHz to permit output noise filtering and to reduce the size of external components. The frequency can also be synchronized to an external clock signal between 200kHz and 480kHz.

The MAX685 has a power-OK indicator output (POK) that signals when both outputs are within regulation. A logic-controlled shutdown completely turns off both outputs and reduces supply current to 0.1µA. The user can also set which output turns on first.

The preassembled MAX685 evaluation kit is available to reduce design time.

Applications

Camcorders
CCD Imaging Devices
Digital Cameras
LCDs
Notebook Computers

Part Models: 3
1ku List Price: Starting From $5.24

Documentation

Data Sheet 1

MAX685: Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD Data Sheet (Rev.1) 06/25/2003

Reliability Data 1

MAX685 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX685EEE+	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX685EEE+T	16-QSOP-150_MIL	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX685ETG+	24-TQFN-4X4X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX685ETG+	PRODUCTION	pcn_1612

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX685

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Features and Benefits

+15V Positive Output Voltage
-7.5V Negative Output Voltage
2.7V to 5.5V Battery Input Voltage
10mA Output Current
Single Inductor for Both Outputs
0.1µA Shutdown Current
200kHz or 400kHz Fixed Frequency
Power-OK Output
Surface-Mount, Low-Profile Components
Fully Assembled and Tested

Product Details

The MAX685 evaluation kit (EV kit) provides dual-output +15V and -7.5V voltages from 2.7V to 5.5V input voltage. Each output regulates separately, and each can deliver 10mA output current. Both output voltages can be adjusted by changing the feedback resistor values.

The MAX685 EV kit provides low quiescent current and high efficiency for maximum battery life. The EV kit operates at a fixed 200kHz or 400kHz frequency, which allows the use of a tiny surface-mount inductor. This EV kit is a fully assembled and tested surface-mount circuit board.