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14V Input, 1.5A High-Efficiency Buck Converter with 9μA IQ

1.5A Buck Converter with 94% Efficiency for 2-Cell/3-Cell Battery Applications

Product Details

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 14
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 13.86
IOUT1 (A) (max) 1.5
Switch Type Internal
Preset VOUT (V) 1.2
1.8
3.3
Output Adjust. Method Digital/VID
Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (typ) 0.014
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
550
Design Tools EE-Sim
Package/Pins WLP/12
Budgetary
Price (See Notes)
0.63
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 14
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 13.86
IOUT1 (A) (max) 1.5
Switch Type Internal
Preset VOUT (V) 1.2
1.8
3.3
Output Adjust. Method Digital/VID
Preset
Resistor
Synchronous Switching? Yes
Power Good Signal Yes
ICC (mA) (typ) 0.014
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
550
Design Tools generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=8980', '')
Package/Pins WLP/12
Budgetary
Price (See Notes)
0.63

Key Features

  • 1.5A Single Channel Buck Regulator
  • 3V to 14V Input Voltage Range
  • 0.8V to 99%VSUP Output Voltage Range
    • 0.8V to 5V I2C Programmable in 50mV Steps
    • 1.55V to 99%VSUP with External Feedback Resistors
    • 1.2V, 1.8V, or 3.3V Factory Preset Options
  • High-Efficiency, Low-IQ Extends Battery Life
    • 94% Peak Efficiency at 7.4VSUP, 3.3VOUT (2520 Inductor)
    • 9µA IQ (12VSUP, 1.8VOUT Internal Feedback Version)
    • Selectable Light-Load SKIP and Forced-PWM Modes
  • 1MHz or 550kHz Fixed-Frequency Switching
  • Hardware or Software Control
    • Enable Input and Power-OK Output Pins
    • Optional I2C Full Control Interface
  • Protection Features
    • Cycle-by-Cycle Inductor Peak Current Limit
    • Short-Circuit Hiccup Mode, UVLO, and Thermal Shutdown Protections
    • 1ms Default Soft-Start
  • Small Size
    • 1.85mm x 1.4mm (0.7mm max. height) WLP
    • 12-Bump, 0.4mm Pitch, 3 x 4 Array

Applications/Uses

  • 2-cell/3-cell High Power Density Supplies
  • Drones, HD Cameras, and Notebook Computers
  • Portable Li+/Li-ion Battery Powered Devices
  • Space-Constrained Portable Electronics

Description

The MAX77503 is a synchronous 1.5A step-down DC-DC converter optimized for portable 2-cell and 3-cell battery- operated and USB-C applications. The converter operates on an input supply between 3V and 14V. Output voltage is adjustable between 0.8V and 5V in 50mV steps through an I2C serial interface or 1.55V to 99% of the supply voltage with external feedback resistors. Factory-programmed default voltages of 1.2V, 1.8V, and 3.3V are offered to reduce component count for common rails. The device features a low-IQ SKIP mode which allows excellent efficiency at light loads.

Dedicated enable and power-OK pins allow simple hardware control. An I2C serial interface is optionally used for full configuration and control for dynamic voltage scaling and system power optimization.

Built-in undervoltage lockout (UVLO), output active discharge, cycle-by-cycle current limit, thermal shutdown, and short-circuit protection ensure safe operation under abnormal operating conditions.

The MAX77503 is available in a 12-bump, 0.4mm pitch wafer-level package (WLP).

Design Solution: How to Extend the Run-Time of Your DSLR/DSLM Camera Design ›

Simplified Block Diagram

MAX77503: Simplified Application Circuit MAX77503: Simplified Application Circuit Zoom icon

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 .