MAX8858:Smallest, All-Internal MOSFET, 6-Channel DSC PMIC in a 5mm x 5mm TQFN

Low-Cost, High-Performance, 6-Channel DSC PMIC

The MAX8858 PMIC provides a complete power-supply solution for digital still cameras (DSCs) and digital video cameras (DVCs). The MAX8858 improves performance, component count, and board space utilization compared to currently available solutions for two AA cell and dual-battery designs. On-chip power MOSFETs provide up to 95% efficiency for critical power supplies. The CCD inverter can operate directly from two AA/NiMH batteries without the use of any additional external components. Step-up synchronous-rectified DC-DC converter (SU). The MAX8858 is bootstrapped from VVSU. MAIN synchronous-rectified step-up DC-DC converter (M) with active discharge for DSP I/O supply voltage. SDZ synchronous-rectified step-down DC-DC converter (SDZ) with active discharge for DSP DDR supply voltage. Low-voltage (down to 1V) synchronous-rectified step-down DC-DC converter (SD) with active discharge for DSP core supply voltage. High-voltage step-up DC-DC converter (CCDBST) for CCD imagers or positive LCD bias supplies. Transformerless inverting DC-DC converter (CCDINV) with active discharge for CCD imagers or negative LCD bias supplies. This converter can connect directly to two AA batteries. Individual ON_ inputs provide independent on/off control for the SU, CCDBST, and CCDINV converters, while dual-function inputs allow independent on/off control or power-up sequencing of the MAIN, SDZ, and SD converters. The MAX8858 is available in a 5mm x 5mm x 0.8mm, 32-pin thin QFN package and operates over the -40°C to +85°C extended temperature range.

Key Features
  • 95% Efficient Synchronous-Rectified DC-DC Converters
  • Up to 90% Efficient Boost-Buck Operation
  • Up to 85% Efficient, High-Voltage DC-DC Converters
  • Transformerless Inverting Converter with Active Discharge for CCD
  • Preset Power-Up Sequencing for MAIN, SDZ, and SD Converters
  • Inverter Operates Directly from Two AA Batteries
  • Internal Compensation on All Channels
  • True Shutdown™ on All Step-Up Converters
  • Overload Protection
  • Startup into Short Protection
  • Soft-Start for Controlled Inrush Current
  • 100% Duty Cycle on Step-Down Converters
  • 2MHz ±5% Switching Frequency
  • 0.1µA Shutdown Supply Current
  • All Internal Power MOSFETs
MAX8858: Typical Operating Circuit
MAX8858: Typical Operating Circuit
  • DSCs and DVCs
  • PDAs and Portable Media Players
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MAX8858 Data SheetMAX8858.pdf
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesLCD/LED/Flash/CCD FeaturesInterface TypeVIN
Oper. Freq.
Inverting OutputsPackage/Pins
ShutdownCurrent Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
CCD Bias
TFT Bias
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8858ETJ+ActiveTQFN,;32 pin;26 mm²-40°C to +85°CLead Free
MAX8858ETJ+TActiveTQFN,;32 pin;26 mm²-40°C to +85°CLead Free
MAX8858.pdf MAX8858
MAX8858.pdf MAX8858
MAX8858.pdf MAX8858
MAX8858.pdf MAX8858
典型工作电路 MAX8858