MAX1703

1-Cell to 3-Cell, High Power (1.5A), Low-Noise, Step-Up DC-DC Converter

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


Description

The MAX1703 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. It uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate a 2.5V to 5.5V output from battery inputs, such as one to three NiCd/NiMH cells or one Li-Ion cell. The device includes a 2A, 75mΩ, N-channel MOSFET switch and a 140mΩ, P-channel synchronous rectifier.

With its internal synchronous rectifier, the MAX1703 delivers up to 5% better efficiency than similar nonsynchronous converters. It also features a pulse-frequency-modulation (PFM) low-power mode to improve efficiency at light loads, and a 1µA shutdown mode.

The MAX1703 comes in a 16-pin narrow SO package and includes an uncommitted comparator that generates a power-good or low-battery-warning output. It also contains a linear gain block that can be used to build a linear regulator.

For lower-power outputs and a smaller package, refer to the MAX1700/MAX1701. For dual outputs (step-up plus linear regulator), refer to the MAX1705/MAX1706. For an on-board analog-to-digital converter, refer to the MAX848/MAX849.

The MAX1703 evaluation kit is available to speed designs.

MAX1703: Typical Operating Circuit MAX1703: Typical Operating Circuit Enlarge+

Key Features

  • Up to 95% Efficiency
  • Up to 1.5A Output
  • Fixed 5V or Adjustable Step-Up Output (2.5V to 5.5V)
  • 0.7V to 5.5V Input Range
  • Low-Power Mode (300µW)
  • Low-Noise, Constant-Frequency Mode (300kHz)
  • Synchronizable Switching Frequency (200kHz to 400kHz)
  • 1µA Logic-Controlled Shutdown
  • Power-Good Comparator
  • Uncommitted Gain Block

Applications/Uses

  • Digital Cordless Phones
  • Handheld Instruments (PDAs, Palmtops)
  • Palmtop Computers
  • PCS Phones
  • Personal Communicators
  • Two-Way Paging
  • Wireless Handsets
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1 (max)
(A)
Output Adjust. Method Switch Type Synchronous Switching DC-DC Outputs Oper. Freq.
(kHz)
Budgetary
Price
min max min max See Notes
MAX1703  0.7 5.5 2.5 5.5 5 1.5 Resistor Internal Yes 1 400 $4.59 @1k
See All Step-Up Switching Regulators (88)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1 (max)
(A)
Output Adjust. Method Switch Type Synchronous Switching DC-DC Outputs Alternate Topology Oper. Freq.
(kHz)
Budgetary
Price
min max min max See Notes
MAX1703  0.7 5.5 2.5 5.5 5 1.5 Resistor Internal Yes 1
Step-Up
Step-Up/Down
400 $4.59 @1k
See All Step-Up/Down Switching Regulators (14)


MAX1703EVKIT:  Evaluation Kit for the MAX1703
 

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