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Small, Dual, High-Efficiency Buck Controller for Notebooks

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 20
VOUT1 (V) (min) 1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.6
Switch Type External
Preset VOUT (V) 1.8
2.5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 350
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.41
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4.5
VIN (V) (max) 20
VOUT1 (V) (min) 1
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.6
Switch Type External
Preset VOUT (V) 1.8
2.5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 2
Switching Frequency (kHz) 350
Package/Pins QSOP/16
Budgetary
Price (See Notes)
4.41

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

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.

Simplified Block Diagram

MAX1761: Typical Application Circuit MAX1761: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.