MAX77503

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


Please check latest availability status for a specific part variant.

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).

MAX77503: Simplified Application Circuit MAX77503: Simplified Application Circuit Enlarge+

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
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)
Design ToolsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX77503 NEW!3140.813.86
1.2
1.8
3.3
Digital/VID
Preset
Resistor
1.5InternalYesYes1
550
1000
EE-Sim
WLP/12
$0.80 @1k
See All Step-Down Switching Regulators (359)
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.


MAX77503EVKIT: Evaluation Kit for the MAX77503

Technical Documents

User Guide 6640 MAX77503 I2C-Compatible Serial Interface Implementation Guide

Quality and Environmental Data

Request Reliability Report for: MAX77503 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • EE-Sim: Design & Simulate MAX77503
  • Software
    MAX77503 Evaluation Kit Software  
    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.

    Quality Management System >
    Environmental Management System >

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