Maxim MAX77640／MAX77641超低功耗PMIC解决方案

Maxim公司的MAX77640/MAX77641是具有3输出SIMO，150mA LDO和加电顺序器的超低功耗PMIC，集成了3输出单电感多输出（SIMO）降压-升压稳压器，150mA LDO和三路电流沉驱动器，工作电压2.7V-5.5V，输出电压0.8V -5.25V可调，主要用在蓝牙耳机和耳塞，可穿戴如健美，健康和活动监视器，照相机，可穿戴照相机和物联网（IoT）小型电器。本文介绍了MAX77640/MAX77641主要优势和特性，详细框图和简化应用电路，以及评估板MAX77640/MAX77641 EVK优势和特性，框图，电路图，材料清单和PCB设计图。

The MAX77640/MAX77641 are a low-IQ power solutionfor applications where size and efficiency are critical. Thedevice integrates a 3-output single-inductor multiple-output （SIMO） buck-boost regulator， a 150mA LDO， and a3-channel current-sink driver.The SIMO operates on an input between 2.7V and 5.5V.

The outputs are independently programmable between0.8V and 5.25V depending on ordering option. Each outputis a buck-boost with glitchless transition between buckand boost operation. The SIMO can support 》300mAloads （1.8VOUT， 3.7VIN）。

The 150mA LDO provides ripple rejection for noise-sensitiveapplications. The current sinks can be programmedto blink LEDs in custom patterns. The device integratesa power sequencer to control power-up/down order ofeach output. Default output voltages and sequence orderare factory-programmable. An I2C serial interface furtherconfigures the device.

The MAX77640/MAX77641 are available in a 30-bumpwafer-level package （WLP）。 Total solution size is 16mm2.For a similar product with a battery charger， refer to theMAX77650.

MAX77640/MAX77641主要优势和特性：

● Compact， High-Efficiency Power Solution

• 3-Output Single-Inductor Multiple-Output （SIMO）Buck-Boost Regulator

• 150mA LDO

• 3-Channel Current-Sink Driver

• Flexible Power Sequencing

• GPIO and Reset Output

● 3-Output SIMO Extends Battery Life

• 2.7V to 5.5V Input Voltage Range from Single CellLi-Ion

• 0.8V to 5.25V Output Voltage Range

• Supports 》300mA loads （1.8VOUT， 3.7VIN）

• Improves Overall System Efficiency while ReducingSize

• Maintains Regulation without Dropout unlikeTraditional Bucks

• Glitchless Buck-Boost Operation

● Low Quiescent Current

• 300nA Shutdown Current

• 5.6μA Operating Current （3 SIMO Channels andLDO On）

● Small Size

• 2.75mm x 2.15mm （0.7mm max heigh） WLP

• 30-Bump， 0.4mm Pitch， 6 x 5 Array

• 16mm2 Total Solution Size

MAX77640/MAX77641应用：

● Hearables： Bluetooth Headphones and Earbuds

● Wearables： Fitness， Health， and Activity Monitors

● Action Cameras， Wearable/Body Cameras

● Internet of Things （IoT） Gadgets

图1.MAX77640/MAX77641简化应用电路

图2.SIMO详细框图

图3.MAX77640/MAX77641应用电路图

评估板MAX77640/MAX77641 EVK

The MAX77640/MAX77641 evaluation kit （EV kit） is a fully assembled and tested printed circuit board （PCB） that demonstrates the MAX77640/MAX77641. The EV kit allows for easy evaluation of the MAX77640/MAX77641 resources， including the SIMO， LDO， GPIO， current sinks， and I2C interface.

Windows®-based software provides a user-friendly graph­ical interface （GUI） as well as a detailed register-based interface to exercise the features of the MAX77640/ MAX77641.

评估板MAX77640/MAX77641 EVK优势和特性：

Easy to Use GUI Drives I2C Interface

Red/Green/Blue LED

Fully Assembled and Tested

Emulates System Loading On-Board Electronic Load for LDO and SIMO Buck Boost Outputs

Electronic Load has Steady-State， Transient， and Random Modes

Evaluates Both Push-Button and Slider-Switch On-Key Options

图4.评估板MAX77640/MAX77641 EVK外形图

图5.评估板MAX77640/MAX77641 EVK正面图

图6.评估板MAX77640/MAX77641 EVK背面图

图7.评估板MAX77640/MAX77641 EVK框图

图8.评估板MAX77640/MAX77641 EVK电路图（1）

图9.评估板MAX77640/MAX77641 EVK电路图（2）

图10.评估板MAX77640/MAX77641 EVK电路图（3）

图11.评估板MAX77640/MAX77641 EVK电路图（4）

评估板MAX77640/MAX77641 EVK材料清单：

图12.评估板MAX77640/MAX77641 EVK PCB设计图（1）：顶层丝印

图13.评估板MAX77640/MAX77641 EVK PCB设计图（2）：底层丝印

图14.评估板MAX77640/MAX77641 EVK PCB设计图（3）：制造笔记

图15.评估板MAX77640/MAX77641 EVK PCB设计图（4）：顶层布局

图16.评估板MAX77640/MAX77641 EVK PCB设计图（5）：内层2

图17.评估板MAX77640/MAX77641 EVK PCB设计图（6）：内层3

图18.评估板MAX77640/MAX77641 EVK PCB设计图（7）：底层