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1 Cell to 3 Cell, High-Power 1A, Low-Noise, Step-Up DC-DC Converters

Compact, High-Efficiency, Low-Noise Step-Up Converter with a Gain-Block

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.2
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.8
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
ICC (mA) (typ) 0.035
Shutdown Mode Supply Current (µA) (typ) 0.1
Shutdown Mode Supply Current (µA) (max) 20
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.06
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.2
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.8
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
ICC (mA) (typ) 0.035
Shutdown Mode Supply Current (µA) (typ) 0.1
Shutdown Mode Supply Current (µA) (max) 20
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.06

Key Features

  • Up to 96% Efficiency
  • 1.1 VIN Guaranteed Start-Up
  • 0.7V to 5.5V Input Range
  • Up to 800mA Output
  • Step-Up Output (adjustable from 2.5V to 5.5V)
  • PWM/PFM Synchronous-Rectified Topology
  • External Clock or Internal 300kHz Oscillator
  • 3µA Logic-Controlled Shutdown
  • Power-Good Output (MAX1701)
  • Low-Battery Comparator (MAX1701)
  • Uncommitted Gain Block (MAX1701)

Applications/Uses

  • Digital Cordless Phones
  • Handheld Instruments (PDAs, Palmtops)
  • Palmtop Computers
  • PCS Phones
  • Personal Communicators
  • Two-Way Paging
  • Wireless Handsets

Description

The MAX1700/MAX1701 are high-efficiency, low-noise, step-up DC-DC converters intended for use in battery-powered wireless applications. They use a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from battery inputs such as one to three NiCd/NiMH cells or one Li-Ion cell. Both devices have an internal 1A, 130mΩ N-channel MOSFET switch and a 250mΩ P-channel synchronous rectifier.

With their internal synchronous rectifier, the MAX1700/ MAX1701 deliver 5% better efficiency than similar nonsynchronous converters. They also feature a pulse-frequency-modulation (PFM) standby mode to improve efficiency at light loads, and a 3µA shutdown mode.

The MAX1700/MAX1701 come in 16-pin QSOP packages (which occupy the same space as an 8-pin SO). The MAX1701 includes two comparators to generate power-good and low-battery warning outputs. It also contains a gain block that can be used to build a linear regulator using an external P-channel pass device.

For higher-power outputs, refer to the MAX1703. For dual outputs (step-up and linear regulator), refer to the MAX1705/MAX1706. For an on-board analog-to-digital converter, refer to the MAX848/MAX849.

The MAX1701 evaluation kit is available to speed design time.

Simplified Block Diagram

MAX1700, MAX1701: Typical Operating Circuit MAX1700, MAX1701: 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 .