MAX8680 业内尺寸最小的7通道DSC电源方案

电子工程师 2008-10-27 814

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描述

MAX8680 业内尺寸最小的7通道DSC电源方案

MAX8680概述

The MAX8680 highly efficient complete power-supply solution is designed for digital still cameras (DSCs) and digital video cameras (DVCs). The device integrates seven on-chip power MOSFET DC-DC converters with up to 95% efficiency to power all critical power supplies in DSC systems. Each converter also features True Shutdown™, as well as internal compensation to minimize external component count. The seven DC-DC converter outputs are:

Step-up synchronous-rectified DC-DC converter (SU). The MAX8680 is bootstrapped from V_SU.

MAIN synchronous-rectified step-down DC-DC converter (M) for DSP I/O supply voltage.

DDRZ synchronous-rectified step-down DC-DC converter (Z) for DSP DDR supply voltage.

Low-voltage (down to 1V) synchronous-rectified step-down DC-DC converter (SD) for DSP core supply voltage.

High-voltage, step-up DC-DC converter with current regulation and PWM dimming control (LEDBST) for white LEDs (WLED).

High-voltage step-up DC-DC converter (CCDBST) for CCD imagers or positive LCD bias supplies.

Transformerless inverting DC-DC converter (CCDINV) for CCD imagers or negative LCD bias supplies.

The MAX8680 has an independent/simultaneous power-on sequence of the CCDBST and CCDINV converters. For a preset power-on sequence of CCDBST before CCDINV, contact the factory.

The MAX8680 operates with 1-cell lithium-ion (Li+) battery, two-AA cell, or dual-battery designs and is available in a 5mm x 5mm, 40-pin thin QFN package. The MAX8680 operates over the -40°C to +85°C extended temperature range.

MAX8680关键特性

95% Efficient Synchronous-Rectified DC-DC Converters
	90% Efficient Boost-Buck Operation
	85% Efficient DC-DC Converters for CCD, LCD, WLED, and/or OLED
	Internal Compensation on All Channels
	True Shutdown on All Step-Up Converters
	Overload Protection
	Soft-Start for Controlled Startup Current
	Dropout Operation (100% Duty Cycle) on Step-Down Converters
	Regulated Current Output for Up to 6 White LEDs
	PWM Dimming of WLED Current
	Adjustable LED Overvoltage Protection Up to 27V
	Transformerless Inverting Converter for CCD
	2MHz Switching Frequency for Low-Voltage Channels
	±2.5% Switching Frequency Accuracy
	1µA Shutdown Supply Current
	Power-On Voltage Tracking for Core and Main Outputs
	All Internal Power MOSFETs
	Active-Low SDOK Power-OK Indicator

MAX8680应用/使用

DSC和DVC
	GPS导航系统
	PDAs and Portable Media Players

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