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MAX797

MAX797

Step-Down Controllers with Synchronous Rectifier for CPU Power

We Recommend Improved Performance Devices: MAX1652/MAX1653/MAX1654/MAX1655 for New Designs

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Overview

Description

The MAX796/MAX797/MAX799 high-performance, step-down DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems. These buck controllers achieve 96% efficiency by using synchronous rectification and Maxim's proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs.

The MAX796/MAX799 are specially equipped with a secondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or negative (MAX799) auxiliary outputs.

The MAX797 has a logic-controlled and synchronizable fixed-frequency pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. The SKIP-bar override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads.

The MAX796/MAX797/MAX799 are all available in 16-pin DIP and narrow SO packages. See the table below to compare these three converters.
MAX796, MAX797, MAX799: Typical Operating Circuits MAX796, MAX797, MAX799: Typical Operating Circuits Enlarge+

Key Features

  • 96% Efficiency
  • 4.5V to 30V Input Range
  • 2.5V to 6V Adjustable Output
  • Preset 3.3V and 5V Outputs (at up to 10A)
  • Multiple Regulated Outputs
  • +5V Linear-Regulator Output
  • Precision 2.505V Reference Output
  • Automatic Bootstrap Circuit
  • 150kHz/300kHz Fixed-Frequency PWM Operation
  • Programmable Soft-Start
  • 375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V)
  • 1µA Typ Shutdown Current

Applications/Uses

  • Cell Phones
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators

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
MAX797 4.5302.56
3.3
5
Preset
Resistor
10ExternalYes1340
CDIP/16
DICE SALES
PDIP/16
SOIC (N)/16
WAFER UNSAWN
$5.85 @1k
See All Step-Down Switching Regulators (389)
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


MAX797EVKIT: Evaluation Kit for the MAX797

Technical Documents

App Note 930 Synchronous Buck-Regulator Output Terminates High-Speed Data Buses
App Note 851 Battery Charger Delivers 2.5A with > 96% Efficiency

Quality and Environmental Data

Product Reliability Reports: MAX797.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 Board1192MAX797EVKIT Evaluation Kit for the MAX797
    Evaluation Board1191MAX796EVKIT Evaluation Kit for the MAX796, MAX799