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4.8VIN, 1.5A High-Efficiency, Ultra-Small Buck Converter

Ultra-small 6.89mm2 total solution 1.5A buck converter with 93% efficiency for single cell battery applications

Product Details

Key Features

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 4.8
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 2
IOUT1 (A) (max) 1.5
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools EE-Sim
Package/Pins WLP/6
Budgetary
Price (See Notes)
0.41
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 2.5
VIN (V) (max) 4.8
VOUT1 (V) (min) 0.6
VOUT1 (V) (max) 2
IOUT1 (A) (max) 1.5
Switch Type Internal
Output Adjust. Method Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 2000
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=7833', '')
Package/Pins WLP/6
Budgetary
Price (See Notes)
0.41

Key Features

  • 1.5A Output Current Step-down Converter
  • 2.5V to 4.8V VIN Range
  • 0.6V to 2V Adjustable VOUT Range, ±2% Accuracy
  • 93% Peak Efficiency (3.8VIN, 1.8VOUT)
    • SKIP Mode for Higher Light-Load Efficiency
    • 40µA Quiescent Current
    • 1µA Shutdown Current
  • 2MHz Nominal Switching Frequency
  • Enable Pin for Direct Hardware Control
  • Cycle-by-Cycle Inductor Current Limit
  • UVLO, Soft-Start, Active Output Discharge, Short-Circuit, and Thermal Shutdown Protections
  • 1.22mm x 0.85mm, 6-Bump WLP
    • 6.89mm2 Total Solution Area
    • Uses Small 0603 0.47µH Inductor

Applications/Uses

  • 1-Cell Battery Powered Equipment
  • Portable/Wearables
  • Internet of Things (IoT) Devices
  • Space Constrained Equipment

Description

The MAX77324 is a single channel high-efficiency synchronous step-down (buck) converter capable of delivering up to 1.5A of current. With a 6.89mm2 total solution size, up to 93% efficiency, and 40µA quiescent current, it is optimized for portable space constrained battery-operated applications.

The device operates over a 2.5V to 4.8V input voltage range to support Li+ battery powered applications. The output voltage is adjustable from 0.6V to 2V, with a better than 2% accuracy over the whole temperature range. The device uses constant-on-time PWM control scheme. A nominal 2MHz switching frequency reduces the overall solution footprint by use of small 0603 inductor. An automatic SKIP mode is also implemented to improve the light-load efficiency. The device provides low output voltage ripple, excellent line and load regulation, and transient response. A dedicated enable pin allows for simple hardware control.

Built-in undervoltage lockout (UVLO), soft-start, active output discharge, cycle-by-cycle short-circuit, and thermal shutdown protections insure safe operations under abnormal operating conditions.

The device is available in a space-saving 1.22mm x 0.85mm, 6-bump wafer-level package (WLP).

Simplified Block Diagram

MAX77324: 1-Cell to Core Voltage Buck Converter Application Circuit MAX77324: 1-Cell to Core Voltage Buck Converter 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 .