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MAX8680：Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN

Industry's Smallest 7-Channel DSC Power Solution

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 VSU. 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.

Key Features 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: Typical Operating Circuit Applications/Uses DSCs and DVCs GPS Navigation Systems PDAs and Portable Media Players

DataSheet

Parametrics

Design kits & evaluation modules

• MAX8680EVKIT

Quality and Environmental Data

• MAX8680.pdf

Ordering Information