Maxim公司的MAX77640/MAX77641是具有3輸出SIMO，150mA LDO和加電順序器的超低功耗PMIC，集成了3輸出單電感多輸出（SIMO）降壓-升壓穩壓器，150mA LDO和三路電流沉驅動器，工作電壓2.7V-5.5V，輸出電壓0.8V -5.25V可調，主要用在藍牙耳機和耳塞，可穿戴如健美，健康和活動監視器，照相機，可穿戴照相機和物聯網（IoT）小型電器。本文介紹了MAX77640/MAX77641主要優勢和特性，詳細框圖和簡化應用電路，以及評估板MAX77640/MAX77641 EVK優勢和特性，框圖，電路圖，材料清單和PCB設計圖。

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主要優勢和特性：

● 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應用：

● Hearables： Bluetooth Headphones and Earbuds

● Wearables： Fitness， Health， and Activity Monitors

● Action Cameras， Wearable/Body Cameras

● Internet of Things （IoT） Gadgets

圖1.MAX77640/MAX77641簡化應用電路

圖2.SIMO詳細框圖

圖3.MAX77640/MAX77641應用電路圖

評估板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 graph-ical interface （GUI） as well as a detailed register-based interface to exercise the features of the MAX77640/ MAX77641.

評估板MAX77640/MAX77641 EVK優勢和特性：

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

圖4.評估板MAX77640/MAX77641 EVK外形圖

圖5.評估板MAX77640/MAX77641 EVK正面圖

圖6.評估板MAX77640/MAX77641 EVK背面圖

圖7.評估板MAX77640/MAX77641 EVK框圖

圖8.評估板MAX77640/MAX77641 EVK電路圖（1）

圖9.評估板MAX77640/MAX77641 EVK電路圖（2）

圖10.評估板MAX77640/MAX77641 EVK電路圖（3）

圖11.評估板MAX77640/MAX77641 EVK電路圖（4）

評估板MAX77640/MAX77641 EVK材料清單：

圖12.評估板MAX77640/MAX77641 EVK PCB設計圖（1）：頂層絲印

圖13.評估板MAX77640/MAX77641 EVK PCB設計圖（2）：底層絲印

圖14.評估板MAX77640/MAX77641 EVK PCB設計圖（3）：制造筆記

圖15.評估板MAX77640/MAX77641 EVK PCB設計圖（4）：頂層布局

圖16.評估板MAX77640/MAX77641 EVK PCB設計圖（5）：內層2

圖17.評估板MAX77640/MAX77641 EVK PCB設計圖（6）：內層3

圖18.評估板MAX77640/MAX77641 EVK PCB設計圖（7）：底層