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

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

Product Details

Key Features

Parametric specs for Multifunction PMICs
VIN (V) (min) 0.9
VIN (V) (max) 5.5
# Step-Down Outputs 2
# Step-Up Outputs 3
# Inverting Outputs 1
VOUT (V) (min) 1
VOUT (V) (max) 18
Package/Pins TQFN/32
Budgetary
Price (See Notes)
0
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Simplified Block Diagram

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Parameters

Parametric specs for Multifunction PMICs
VIN (V) (min) 0.9
VIN (V) (max) 5.5
# Step-Down Outputs 2
# Step-Up Outputs 3
# Inverting Outputs 1
VOUT (V) (min) 1
VOUT (V) (max) 18
Package/Pins TQFN/32
Budgetary
Price (See Notes)
0

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

Applications/Uses

  • DSCs and DVCs
  • PDAs and Portable Media Players

Description

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.

Simplified Block Diagram

MAX8858: Typical Operating Circuit MAX8858: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .