MAX8680

Obsolete

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

Industry's Smallest 7-Channel DSC Power Solution

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • 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

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.

Applications

  • DSCs and DVCs
  • GPS Navigation Systems
  • PDAs and Portable Media Players
MAX8680
Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN
MAX8680: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

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Evaluation Kits

MAX8680EVKIT

Evaluation Kit for the MAX8680

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Features and Benefits

  • 95% Efficient Synchronous-Rectified DC-DC Converters
  • 90% Efficient Buck-Boost 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 All 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 Inverter for CCD
  • 2MHz Switching Frequency for Low-Voltage Channels
  • 1µA Shutdown Supply Current
  • Power-On Voltage Tracking for Core and Main Outputs
  • All Internal Power MOSFETs
  • Active-Low SDOK Power-OK Indicator
  • 40-Pin, 5mm x 5mm x 0.8mm Thin QFN Package
  • Fully Assembled and Tested

Product Details

The MAX8680 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that evaluates the MAX8680 power-management IC. The MAX8680 accepts an input from 2.7V to 5.5V and provides a complete power-supply solution for digital still cameras (DSCs) and digital video cameras (DVCs). It integrates seven on-chip power MOSFET DC-DC converters, with up to 95% efficiency to power all critical power supplies in DSC systems. All step-up converters also feature True Shutdown™, as well as internal compensation, to minimize external component count.

Applications

  • DSCs and DVCs
  • GPS Navigation Systems
  • PDAs and Portable Media Players
MAX8680EVKIT
Evaluation Kit for the MAX8680

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