MAX1537A

High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers

High-Efficiency, 5x Output, Main-Power-Supply Controllers with Synchronous Rectification, Intended for Main 5V/3.3V Power Generation in Battery-Powered Systems


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Description

The MAX1533A/MAX1537A are dual step-down, switch-mode power-supply (SMPS) controllers with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems. Fixed-frequency operation with optimal interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Optimal 40/60 interleaving allows the input voltage to go down to 8.3V before duty-cycle overlap occurs, compared to 180° out-of-phase regulators where the duty-cycle overlap occurs when the input drops below 10V. Output current sensing provides accurate current limit using a sense resistor. Alternatively, power dissipation can be reduced using lossless inductor current sensing.

Internal 5V and 3.3V linear regulators power the MAX1533A/MAX1537A and their gate drivers, as well as external keep-alive loads, up to a total of 100mA. When the main PWM regulators are in regulation, automatic bootstrap switches bypass the internal linear regulators, providing currents up to 200mA from each linear output. An additional 5V to 23V adjustable internal 150mA linear regulator is typically used with a secondary winding to provide a 12V supply.

The MAX1533A/MAX1537A include on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-shutdown output discharge that prevents negative voltages on shutdown. The MAX1533A is available in a 32-pin 5mm x 5mm thin QFN package, and the MAX1537A is available in a 36-pin 6mm x 6mm thin QFN package. The exposed backside pad improves thermal characteristics for demanding linear keep-alive applications.
MAX1533A, MAX1537A: Standard Application Circuit MAX1533A, MAX1537A: Standard Application Circuit Enlarge+

Key Features

  • Fixed-Frequency, Current-Mode Control
  • 40/60 Optimal Interleaving
  • Accurate Differential Current-Sense Inputs
  • Internal 5V and 3.3V Linear Regulators with 100mA Load Capability
  • Auxiliary 12V or Adjustable 150mA Linear Regulator (MAX1537A Only)
  • Dual Mode™ Feedback—3.3V/5V Fixed or Adjustable Output (Dual Mode) Voltages
  • 200kHz/300kHz/500kHz Switching Frequency
  • Versatile Power-Up Sequencing
  • Adjustable Overvoltage and Undervoltage Protection
  • 6V to 26V Input Range
  • 2V ±0.75% Reference Output
  • Power-Good Output
  • Soft-Shutdown
  • 5µA (typ) Shutdown Current

Applications/Uses

  • 2 to 4 Li+ Cell Battery-Powered Devices
  • Notebook and Subnotebook Computers
  • PDAs and Mobile Communicators
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/Pins
minmaxminmax
MAX1537A 62615.5
3.3
5
Preset
Resistor
5ExternalYesYes2500
SOIC(N)/8
See All Step-Down Switching Regulators (404)
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.

Quality and Environmental Data

Request Reliability Report for: MAX1537A 
Lead-Free Package Tin (Sn) Whisker Reports
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.

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