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
MAX8680: Typical Operating Circuit
Applications/Uses
  • DSCs and DVCs
  • GPS Navigation Systems
  • PDAs and Portable Media Players
DataSheet
titleDownload file
MAX8680 Data SheetMAX8680.pdf
Parametrics
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesLCD/LED/Flash/CCD FeaturesInterface TypeVIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Oper. Freq.
(kHz)
Inverting OutputsPackage/Pins
minmaxminmax
MAX8680Step-Down
Step-Up
Step-Up/Down
Low Batt./POK Output
Output OVP
Shutdown
Volt. or PWM Controlled Output
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
CCD Bias
TFT Bias
White LED
GPIO0.95.51272.520001TQFN/40
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8680CETL+ActiveTQFN,;40 pin;26 mm²-40°C to +85°CLead Free
MAX8680CETL+TActiveTQFN,;40 pin;26 mm²-40°C to +85°CLead Free
MAX8680ETL+ActiveTQFN,;40 pin;26 mm²-40°C to +85°CLead Free
MAX8680ETL+TActiveTQFN,;40 pin;26 mm²-40°C to +85°CLead Free
MAX8680.pdf MAX8680
MAX8680.pdf MAX8680
MAX8680.pdf MAX8680
MAX8680.pdf MAX8680
典型工作电路 MAX8680