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3.3V/5V or Adjustable Output, Step-Up DC-DC Converters

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 6
VOUT1 (V) (min) 2.7
VOUT1 (V) (max) 6
IOUT1 (A) (max) 0.15
Switch Type Internal
Output Adjust. Method Resistor
Power Good Signal Yes
IQ (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 1
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.75
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.8
VIN (V) (max) 6
VOUT1 (V) (min) 2.7
VOUT1 (V) (max) 6
IOUT1 (A) (max) 0.15
Switch Type Internal
Output Adjust. Method Resistor
Power Good Signal Yes
IQ (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 1
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
2.75

Key Features

  • 0.8V to 6.0V Input Supply Voltage
  • 0.8V Typ Start-Up Supply Voltage
  • 85% Efficiency at 100mA
  • 25µA Quiescent Current
  • 1µA Shutdown Mode
  • 125mA and 500mA Switch-Current Limits Permit Use of Low-Cost Inductors
  • Up to 500kHz Switching Frequency
  • ±1.5% Reference Tolerance Over Temperature
  • Low-Battery Detector (LBI/LBO)
  • 8-Pin SO and µMax Packages

Applications/Uses

  • 2-Cell and 3-Cell Battery-Operated Equipment
  • 3.3V to 5V Step-Up Conversion
  • Glucose Meters
  • Medical Instrumentation
  • Palmtop Computers
  • Personal Data Communicators/Computers
  • Portable Data-Collection Equipment

Description

The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quiescent supply current is 25µA (1µA in shutdown).

The MAX856-MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.

Simplified Block Diagram

MAX856, MAX857, MAX858, MAX859: Typical Operating Circuit MAX856, MAX857, MAX858, MAX859: 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.