MAX1761

Small, Dual, High-Efficiency Buck Controller for Notebooks


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Description

The MAX1761 dual pulse-width-modulation (PWM), step-down controller provides high efficiency, excellent transient response, and high DC output accuracy in an extremely compact circuit topology. These features are essential for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in PC board area critical applications, such as notebook computers and smart phones.

Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The MAX1761 achieves high efficiency at reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive large synchronous-rectifier MOSFETs. The MAX1761 employs a complementary MOSFET output stage, which reduces component count by eliminating external bootstrap capacitors and diodes.

Single-stage buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX1761 is intended for CPU core, chipset, DRAM, or other low-voltage supplies. The MAX1761 is available in a 16-pin QSOP package. For applications requiring greater output power, refer to the MAX1715 data sheet. For a single-output version, refer to the MAX1762/MAX1791 data sheet.
MAX1761: Typical Application Circuit MAX1761: Typical Application Circuit Enlarge+

Key Features

  • Free-Running On-Demand PWM
  • Selectable Light-Load Pulse-Skipping Operation
  • ±1% Total DC Error in Forced-PWM Mode
  • 5V to 20V Input Range
  • Flexible Output Voltages
    • OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V Adjustable
    • OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V Adjustable
  • Output Undervoltage Protection
  • Complementary Synchronous Buck
  • No Current-Sense Resistor
  • 4.65V at 25mA Linear Regulator Output
  • 4µA V+ Shutdown Supply Current
  • 5µA VL Shutdown Supply Current
  • 950µA Quiescent Supply Current
  • Tiny 16-Pin QSOP Package

Applications/Uses

  • 1.8V/2.5V Logic and I/O Supplies
  • Digital Still Cameras
  • Handy Terminals
  • Notebooks and PDAs
  • Smartphones

See parametric specs for Step-Down Switching Regulators (409)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
IOUT1
(A)
(min)(max)(min)(max)
MAX1761 4.52010.6

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.
Request Reliability Report for: MAX1761 
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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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