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[原创] Maxim MAX77829高性能3G-4G智能手机电源解决方案

关键词:电源管理 PMIC DC/DC转换器 MAX77829

时间:2016-03-15 11:02:08       作者:Maxim       来源:中电网

Maxim公司的MAX77829是高性能3G/4G智能手机和平板电脑电源管理IC(PMIC),包括有带反向升压功能的单输入2.0A开关充电器,输入保护高达22V(DC)的适配器,主要用于单颗锂电池, LDO,WLED背景光驱动器.器件还具有双路1.5A闪光LED驱动器(包括火炬模式).主要用在手持设备锂电池电源以及智能手机和平板电脑.本文介绍了MAX77829主要特性,多种功能框图和应用电路,以及MAX77829评估板主要特性,电路图,材料清单和PCB设计图.

The MAX77829 is a high-performance companion PMIC for latest 3G/4G smartphones and tablets. The PMIC includes a single-input 2.0A switched-mode charger with reverse-boost capability and adapter input protection up to 22V (DC) for one-cell Lithium-Ion (Li+) battery, a safeout LDO, and WLED backlight driver supporting up to 25mA/string, 35V output voltage. It also features a dual-channel 1.5A (combined, 750mA/CH) Flash LED driver (with Torch Mode included).

The typical 4MHz switched-mode battery charger with two integrated switches, providing the smallest L/C size, lowest heat and fastest programmable battery-charging current, is ideally suited for portable devices such as headsets and ultra-portable media players. The charger features single input, which works for adapter/USB type inputs. All the MAX77829 blocks connecting to the adapter/USB pin are protected from input overvoltage events. The DC pin is rated to 22V absolute maximum. The USB-OTG output provides true-load disconnect and is protected by an adjustable output current limit (default 900mA, other current limit is also available with different factory setting up to 900mA).

The battery charger drives an external p-channel MOSFET as power-path switch, and its I2C-programmable settings can accommodate a wide range of battery sizes and system loads. When configured in reverse boost mode, the MAX77829 requires no additional inductor to power USB OTG accessories and/or provide illumination to the Flash LED.

The switching charger implements a special CC, CV, and die temperature regulation algorithm; the patented MaxFlash prevents overloading a weak battery, further extending battery life.

The MAX77829 features an I2C 2.0-compatible serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL).

MAX77829主要特性:

Highly Integrated Solution
Single Input Switched Mode Charger
Camera Flash and Torch LED Driver, Dual-Channel 750mA/ch
Two-String White LED Backlight Driver, 25mA/ch, 35V OVP
One Safeout LDO
Single High Efficient Switched Mode Charger
Supporting Up to 2.0A Charging Current Capability
Input-Voltage-Based Automatic Input Current Limit (AICL) Power Management
System Voltage Regulator/Battery Charger with External Power Path
Various Charging Protection Features
Single Input Accommodating Standard USB and High Input Voltage Adaptor
22V Absolute Maximum Input Voltage Rating,
Up to +9.4V Maximum Operating Input Voltage
USB OTG Capability
Reverse Boost Support, Up to 900mA at +5V
Programmable Reverse Boost Output Voltage (Up to 5.8V)
Flexible Programmability
I2C 2.0 Serial Interface
Compact Package
3.64mm x 3.24mm WLP, 8 x 7 Array, 56-Bumps, 0.4mm Pitch

MAX77829应用:

Other Li-Ion Battery Power Handheld Devices
Smartphone and Tablets

图1.MAX77829框图

图2.MAX77829主电池充电器典型电路图

图3.MAX77829充电器反向升压转换器和电流源功能框图

图4.MAX77829 WLED升压转换器和电流源功能框图

图5.MAX77829典型电路图

MAX77829评估板

The MAX77829 evaluation kit (EV kit) is a fully assembled and tested printed circuit board that demonstrates the functionality and performance of MAX77829. The EV kit allows for easy evaluation of each block and feature. In the package, one set of MINIQUSB from Maxim (serves as an I2C to USB interface) is provided with the MAX77829 EV kit for easy testing.

Windows®-based software provides a user-friendly interface to exercise the features of the MAX77829. This software offers a graphical user interface (GUI) as well as aregister-based interface.

MAX77829评估板主要特性:

EV Kit Includes All the Necessary Components for Device Operation in Addition to Many Components for Added Flexibility and Ease of Use
Easy-to-Use Pushbutton Interface for On/Off Control
Assembled and Tested
Test Points Allowing Convenient Access to Nodes of Interest
Lead-Free and RoHS Compliant
Jumper Headers Acting as Both Test Points and Shunts

图6.MAX77829评估板外形图

图7.MAX77829评估板电路图(1)

图8.MAX77829评估板电路图(2)
MAX77829评估板材料清单:


图9.MAX77829评估板PCB设计图(1)

图10.MAX77829评估板PCB设计图(2)

图11.MAX77829评估板PCB设计图(3)

图12.MAX77829评估板PCB设计图(4)

图13.MAX77829评估板PCB设计图(5)

图14.MAX77829评估板PCB设计图(6)

图15.MAX77829评估板PCB设计图(7)
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX77829.pdf
https://datasheets.maximintegrated.com/en/ds/MAX77829EVKIT.pdf
MAX77829.pdf
MAX77829EVKIT.pdf

 

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