MAX20361DEWC

Part: MAX20361AEWC+T — Maxim Integrated Type: Solar Energy Harvester with Boost Converter and Battery Charger Description: A fully integrated solution for harvesting energy from single-/multi-cell solar sources, featuring an ultra-low quiescent current (360 nA) boost converter capable of starting from 225 mV input, efficient harvesting from 15 μW to over 300 mW, and an integrated Li-ion battery charger with I2C programmable features.

Operating Conditions:

• Supply voltage (SYS): +3.0V to +4.2V
• Input operating voltage (SRC): 0V to 2.5V
• Operating temperature: -40 °C to +85 °C

Absolute Maximum Ratings:

• Max supply voltage (SYS, VCC): +6V
• Max continuous current into LX, GND or SYS: ±0.5A
• Max junction temperature: +150 °C
• Max storage temperature: +150 °C

Key Specs:

• SYS Sleep Supply Current: 360 nA (typ)
• Minimum Cold-Start Voltage: 225 mV (typ, at TA = 25°C)
• Boost Efficiency: 86% (typ, at V SRC = 0.75V, V SYS = 3.8V, I SRC = 30mA)
• System Termination Voltage-Programmable Range: 4 to 4.7 V (50mV steps, programmable through I2C)
• Fractional Open Circuit Voltage-Programmable Range: 42.5 to 89.0 % (1.5% steps, programmable through I2C)
• LX Low-Side On Resistance: 0.1 Ω (typ)
• LX SYS High-Side On Resistance: 0.29 Ω (typ)
• Serial Operating Frequency (I2C): 400 kHz (max)

Features:

• Single-/Multi-Cell Solar Energy Harvester
• Efficient Harvesting from 15μW to Over 300mW of Available Input Power
• Maximum Power Point Tracking (MPPT) Technique Using Fractional VOC Method
• Programmable Fractional VOC Regulation Point through I2C Interface
• Battery/Supercapacitor Charger
• Programmable Battery Termination Voltage through I2C Interface
• Programmable Power Good Wake-Up Signal Output Threshold through I2C Interface

Applications:

• Wearable Fitness
• Medical Devices
• Industrial IoT Sensors
• Asset Tracking Devices
• Wireless Sensor Networks

Package:

• 12-bump WLP (1.63mm x 1.23mm, 0.4mm pitch)

• Single-/Multi-Cell Solar Energy Harvester
• 225mV to 2.5V (typ) Input-Voltage Range
• Efficient Harvesting from 15μW to Over 300mW of Available Input Power
• -86% Efficiency at V SYS = 3.8V, I SRC = 30mA
• Small Solution Size
• -Utilizes Small 2016 4.7μH Inductor
• Maximum Power Point Tracking (MPPT) Technique Using Fractional VOC Method
• Programmable Fractional VOC Regulation Point through I 2 C Interface
• Battery/Supercapacitor Charger
• Programmable Battery Termination Voltage through I 2 C Interface
• Programmable Power Good Wake-Up Signal Output Threshold through I 2 C Interface

Ordering Information appears at end of data sheet

MAX20361

• Wearable Fitness
• Medical Devices
• Industrial IoT Sensors
• Asset Tracking Devices
• Wireless Sensor Networks

(V SYS = +3.0V to +4.2V, V SRC = +0.3V to +2.5V, typical value is at V SYS = +3.8V, V SRC = +0.6V, T A = +25°C.) (Note 1)

(V SYS = +3.0V to +4.2V, V SRC = +0.3V to +2.5V, typical value is at V SYS = +3.8V, V SRC = +0.6V, T A = +25°C.) (Note 1)

Note 1: All devices 100% productions tested at 25°C. Limits over the operating temperature range are guaranteed by design.

Note 2: All capacitance values listed in this document refer to effective capacitance. Be sure to specify capacitors that meets these requirements under typical system operating conditions, taking into consideration the effects of voltage and temperature.

Note 3: Not production tested. Guaranteed by design.

• SRC to GND......................................................-0.3V to +3.5V
• INT , EN , SDA, SCL to GND..................................-0.3V to +6V
• WAKE to GND....................................... -0.3V to (SYS + 0.3V)
• REF, THM to GND..................................-0.3V to (V CC + 0.3V)
• LX to GND..............................................-0.3V to (V CC + 0.3V)
• Continuous Current into LX, GND or SYS .........-0.5A to +0.5A

Continuous Current into any other Pin .......... -0.05A to +0.05A

Continuous Power Dissipation (Multilayer Board) (T A = +70 o C, derate 13.73mW/ o C above +70 o C) ......................... 1098.4mW

Operating Temperature Range ........................ -40 o C to +85 o C

Junction Temperature Range ......................... -40 o C to +150 o C

Storage Temperature Range ......................... -40 o C to +150 o C

Soldering Temperature (reflow).................................... +260 o C

Stresses beyond those listed under 'Absolute Maximum Ratings' may cause permanent damage to the device. These are stress rati ngs only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

When ThmEn3 is 1, the MAX20361 monitors the voltage on THM. The device checks VTHM once if FrcTHM6 is 1 or periodically every Tper1:0 time if THMper6 is 1. During that process, the MAX20361 drives REF to 1.2V (typ) for 1ms (typ). The voltage divider, formed by the pullup resistor from THM to REF and the NTC thermistor from THM to ground, provides a voltage at THM proportional to the temperature as a fraction of VREF. When VTHM is above 57.5% of VREF or below 18.7% of VREF, THMflag6 is set and the boost is halted. These thresholds are equivalent to 0°C and 45°C if a 10kΩ NTC thermistor with β = 3380 and a 22kΩ pullup resistor are used.

The device also performs a THM check at power-on and on the EN falling edge. A fault condition is assumed until this first THM check is completed.