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MAX77503

INTERACTIVE Data Sheet Buy Now Download

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

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

INTERACTIVE Data Sheet

Product Details

Overview

General 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-I_Q 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).

Simplified Application Circuit

Benefits and Features

1.5A Single Channel Buck Regulator
3V to 14V Input Voltage Range
0.8V to 99%V_SUP Output Voltage Range
- 0.8V to 5V I²C Programmable in 50mV Steps
- 1.55V to 99%V_SUP with External Feedback Resistors
- 1.2V, 1.8V, or 3.3V Factory Preset Options
High-Efficiency, Low-I_Q Extends Battery Life
- 94% Peak Efficiency at 7.4V_SUP, 3.3V_OUT (2520 Inductor)
- 9μA I_Q (12V_SUP, 1.8V_OUT 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

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

19-100131; Rev 2; 12/18

See parametric specs for Step-Down Switching Regulators

Key Features

See parametric specs for Step-Down Switching Regulators

Parametric specs for Step-Down Switching Regulators

V_IN (V) (min)	3
V_IN (V) (max)	14
V_OUT1 (V) (min)	0.8
V_OUT1 (V) (max)	13.86
I_OUT1 (A) (max)	1.5
Switch Type	Internal
Preset V_OUT (V)	1.2 1.8 3.3
Output Adjust. Method	Digital/VID Preset Resistor
Synchronous Switching?	Yes
Power Good Signal	Yes
I_Q (mA) (typ)	0.014
# DC-DC Outputs	1
Switching Frequency (kHz)	550 1000
Design Tools	EE-Sim
Package/Pins	WLP/12
Budgetary Price (See Notes)	0.67

See parametric specs for Step-Down Switching Regulators

View Less

Simplified Block Diagram

Technical Docs

Data Sheet	14V Input, 1.5A High-Efficiency Buck Converter with 9μA I_Q	Jan 17, 2019
App Note	How to Extend the Run-Time of Your DSLR/DSLM Camera Design
App Note	Generating Greater System Efficiency for Single- to Multi-Cell Battery-Powered Designs
User Guide	MAX77503 I²C-Compatible Serial Interface Implementation Guide

Design & Development

Click any title below to view the detail page where available.

Additional Resources

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

Evaluation Board

MAX77503EVKIT

Data Sheet

$78.26

Description/Applications

The MAX77503 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX77503 synchronous step-down (buck) converter. The EV kit is a step-down voltage regulator circuit using MAX77503 that is capable of 3V to 14V input, 1.5A continuous load, and output voltage adjustable between 0.8V and 5V (internal feedback options) or 1.55V and 99% of the input voltage (external feedback option).

The EV kit features a dual-range electronic load that allows easy evaluation of loading use cases for the buck converter circuit. Steady-state, transient, or random load profiles can be programmed.

A USB-to-I²C translator circuit allows a Windows^®-based PC to run a graphical user interface (GUI) for easy control of the MAX77503 registers as well as the on-board electronic load.

View Details

Features

Proven PCB Reference Design and Layout
Easy to Use

Simple Hardware Control: Jumpers and Test Points for EN, BIASEN, and POK
GUI Drives I²C Interface for Optional Software Control
Fully Assembled and Tested

USB to I²C Converter Allows for Easy Communication

Windows-Based Software GUI Controls Registers
Level Translator (MAX3395) Allows for Adjusting I²C Bus Voltage from 1.8V to 3.3V

On-Board Electronic Load Emulates System Loading

Steady-State, Transient, and Random Modes

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

Tools & Models

EE-Sim: Design & Simulate MAX77503

Create Design

SIMULATION MODELS

MAX77503 SIMPLIS Schematic

Free OASIS Simulator (SIMPLIS and SPICE)

Download

Support & Training

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Sampling:
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Overview

General Description

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).

Simplified Application Circuit

Benefits and Features

1.5A Single Channel Buck Regulator
3V to 14V Input Voltage Range
0.8V to 99%V_SUP Output Voltage Range
- 0.8V to 5V I²C Programmable in 50mV Steps
- 1.55V to 99%V_SUP with External Feedback Resistors
- 1.2V, 1.8V, or 3.3V Factory Preset Options
High-Efficiency, Low-I_Q Extends Battery Life
- 94% Peak Efficiency at 7.4V_SUP, 3.3V_OUT (2520 Inductor)
- 9μA I_Q (12V_SUP, 1.8V_OUT 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

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

19-100131; Rev 2; 12/18

Parameters

Parametric specs for Step-Down Switching Regulators

V_IN (V) (min)	3
V_IN (V) (max)	14
V_OUT1 (V) (min)	0.8
V_OUT1 (V) (max)	13.86
I_OUT1 (A) (max)	1.5
Switch Type	Internal
Preset V_OUT (V)	1.2 1.8 3.3
Output Adjust. Method	Digital/VID Preset Resistor
Synchronous Switching?	Yes
Power Good Signal	Yes
I_Q (mA) (typ)	0.014
# DC-DC Outputs	1
Switching Frequency (kHz)	550 1000
Design Tools	generateDesignEESIMUrl('https://maxim.transim.com/pwm2/designreq/Index?partId=8980', '')
Package/Pins	WLP/12
Budgetary Price (See Notes)	0.67

See parametric specs for Step-Down Switching Regulators