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Maxim公司的MAX77503是同步1.5A 94%效率降壓DC疍C轉(zhuǎn)換器，工作輸入電壓3V到14V，輸出電壓在0.8V到5V間通過I2C串口可調(diào)，每步50mV，主要用在2電池／3電池高密度電源，手持鋰+／鋰離子電池供電設(shè)備，無人機(jī)，HD照相機(jī)和筆記本電腦。本文介紹了MAX77503主要特性和優(yōu)勢(shì)，框圖和多種應(yīng)用電路，以及評(píng)估板MAX77503 EVK優(yōu)勢(shì)和特性，電路圖，材料清單和PCB設(shè)計(jì)圖。
1.5A buck converter with 94% efficiency for 2-cell/3-cell battery applications
The MAX77503 is a synchronous 1.5A step-down DCDCconverter optimized for portable 2-cell and 3-cell battery-operated and USB-C applications. The converter operateson an input supply between 3V and 14V. Outputvoltage is adjustable between 0.8V and 5V in 50mV stepsthrough an I2C serial interface or 1.55V to 99% of the supplyvoltage with external feedback resistors. Factory-programmeddefault voltages of 1.2V， 1.8V， and 3.3V are offeredto reduce component count for common rails. Thedevice features a low-IQ SKIP mode which allows excellentefficiency at light loads.
Dedicated enable and power-OK pins allow simple hardwarecontrol. An I2C serial interface is optionally used forfull configuration and control for dynamic voltage scalingand 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 underabnormal operating conditions.
The MAX77503 is available in a 12-bump， 0.4mmpitch wafer-level package （WLP）。
MAX77503主要特性和優(yōu)勢(shì)：
● 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 FeedbackResistors
? 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 （2520Inductor）
? 9μA IQ （12VSUP， 1.8VOUT Internal FeedbackVersion）
? Selectable Light-Load SKIP and Forced-PWMModes
● 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 ThermalShutdown 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
MAX77503應(yīng)用：
● 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
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/223101aD_0.png)
圖1.MAX77503簡(jiǎn)化應(yīng)用電路
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/223202R01_0.png)
圖2.MAX77503外部反饋電路
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/2233014410_0.png)
圖3.MAX77503內(nèi)部反饋電路，3.3V工廠默認(rèn)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/223402IN_0.png)
圖4.MAX77503內(nèi)部反饋電路，1.8V工廠默認(rèn)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/2235019302_0.png)
圖5.MAX77503內(nèi)部反饋電路，1.2V工廠默認(rèn)
評(píng)估板MAX77503 EVK
The MAX77503 evaluation kit （EV kit） is a fully assem-bled 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.
評(píng)估板MAX77503 EVK優(yōu)勢(shì)和特性：
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
圖6.評(píng)估板MAX77503 EVK外形圖
圖7.評(píng)估板MAX77503 EVK頂層視圖
圖8.評(píng)估板MAX77503 EVK底層視圖
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/223Z23091_0.png)
圖9.評(píng)估板MAX77503 EVK簡(jiǎn)化框圖
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/2240024602_0.png)
圖10.評(píng)估板MAX77503 EVK電路圖（1）
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/2241014139_0.png)
圖11.評(píng)估板MAX77503 EVK電路圖（2）
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/224201HT_0.png)
圖12.評(píng)估板MAX77503 EVK電路圖（3）
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/2243024a0_0.png)
圖13.評(píng)估板MAX77503 EVK電路圖（4）
評(píng)估板MAX77503 EVK材料清單：
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/224401PR_0.png)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/22450194W_0.png)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/2246023437_0.png)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/224F225I_0.png)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/224P2Z14_0.png)
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/224Z13432_0.png)
圖14.評(píng)估板MAX77503 EVK PCB設(shè)計(jì)圖：頂層絲印
圖15.評(píng)估板MAX77503 EVK PCB設(shè)計(jì)圖：頂層
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/22510150S_0.png)
圖16.評(píng)估板MAX77503 EVK PCB設(shè)計(jì)圖：內(nèi)層2
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/225201a45_0.png)
圖17.評(píng)估板MAX77503 EVK PCB設(shè)計(jì)圖：內(nèi)層3
圖18.評(píng)估板MAX77503 EVK PCB設(shè)計(jì)圖：底層
![[原創(chuàng)] Maxim MAX77503 1．5A 94%效率降壓轉(zhuǎn)換器解決方案](/uploads/allimg/181120/225401aG_0.png)
圖19.評(píng)估板MAX77503 EVK PCB設(shè)計(jì)圖：底層絲印
詳情請(qǐng)見：
https://datasheets.maximintegrated.com/en/ds/MAX77503.pdf
和https://datasheets.maximintegrated.com/en/ds/MAX77503AEVKIT-MAX77503B33EVKIT.pdf
MAX77503.pdf
MAX77503AEVKIT-MAX77503B33EVKIT.pdf
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