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MAX1653

MAX1653

High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP

10A DSP/CPU Core Supply with Secondary Outputs in Space-Saving QSOP Package

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Overview

Description

The MAX1652-MAX1655 are high-efficiency, pulse-width-modulated (PWM), step-down DC-DC controllers in small QSOP packages. The MAX1653/MAX1655 also come in 16-pin narrow SO packages that are pin-compatible upgrades to the popular MAX797. Improvements include higher duty-cycle operation for better dropout, lower quiescent supply currents for better light-load efficiency, and an output voltage down to 1V (MAX1655).

The MAX1652-MAX1655 achieve up to 96% efficiency and deliver up to 10A using a unique Idle Mode™ synchronous-rectified PWM control scheme. These devices automatically switch between PWM operation at heavy loads and pulse-frequency-modulated (PFM) operation at light loads to optimize efficiency over the entire output current range. The MAX1653/MAX1655 also feature logic-controlled, forced PWM operation for noise-sensitive applications.

All devices operate with a selectable 150kHz/300kHz switching frequency, which can also be synchronized to an external clock signal. Both external power switches are inexpensive N-channel MOSFETs, which provide low resistance while saving space and reducing cost.

The MAX1652 and MAX1654 have an additional feedback pin that permits regulation of a low-cost second output tapped from a transformer winding. The MAX1652 provides an additional positive output. The MAX1654 provides an additional negative output.

The MAX1652-MAX1655 have a 4.5V to 30V input voltage range. The MAX1652/MAX1653/MAX1654's output range is 2.5V to 5.5V while the MAX1655's output range extends down to 1V. An evaluation kit (MAX1653EVKit) is available to speed designs.

MAX1652, MAX1653, MAX1654, MAX1655: Functional Diagram MAX1652, MAX1653, MAX1654, MAX1655: Functional Diagram Enlarge+

Key Features

  • 96% Efficiency
  • Small, 16-Pin QSOP Package (half the size of a 16-pin narrow SO)
  • Pin-Compatible with MAX797 (MAX1653/MAX1655)
  • Output Voltage Down to 1V (MAX1655)
  • 4.5V to 30V Input Range
  • 99% Duty Cycle for Lower Dropout
  • 170µA Quiescent Supply Current
  • 3µA Logic-Controlled Shutdown
  • Dual, N-Channel, Synchronous-Rectified Control
  • Fixed 150kHz/300kHz PWM Switching, or Synchronized from 190kHz to 340kHz
  • Programmable Soft Start
  • Low-Cost Secondary Outputs (MAX1652/MAX1654)
  • Synchronous rectifier, secondary output regulation, high efficiency over full IOUT range

Applications/Uses

  • Cell Phones
  • Distributed Power
  • Handheld Computers
  • Handy Terminals
  • Mobile Communications
  • Notebook Computers
  • PDAs

Parametric Specs

Part NumberVIN
(V)		VIN
(V)		VOUT1
(V)		VOUT1
(V)		Preset VOUT
(V)		Output Adjust. MethodIOUT1
(A)		Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)		Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1652 4.5302.55.5
3.3
5
Preset
Resistor
10ExternalYes2340
QSOP/16
$3.51 @1k
MAX1653 2.51
QSOP/16
SOIC (N)/16
$3.69 @1k
MAX1654 2.52
QSOP/16
$3.69 @1k
MAX1655 11
QSOP/16
SOIC (N)/16
$3.69 @1k
See All Step-Down Switching Regulators (388)
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.

Design Resources


MAX1653EVKIT: Evaluation Kit for the MAX1653, MAX1655

Technical Documents

Tutorial 4992 Reduce the Chances of Human Error: Part 1, Power and Ground
App Note 1882 Increase the Power of a Buck (Step-Down) Switching Power Supply IC
Tutorial 986 Input and Output Noise in Buck Converters Explained
Tutorial 716 Proper Layout and Component Selection Controls EMI

Quality and Environmental Data

Product Reliability Reports: MAX1653.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

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    Technical Docs

    Reference Designs

    Type ID Title
    Evaluation Board1854MAX1653EVKIT Evaluation Kit for the MAX1653, MAX1655