Cypress MB39C831 Solar and Thermal Energy Harvesting Power Management Solution

Cypress's MB39C831 is an ultra-low voltage boost solar and thermal energy harvesting power management IC that includes control of DC/DC converter output and safe charging protection for lithium batteries based on Solar Maximum Power Tracking (MPPT), input voltage 0.3V -4.75V, output voltage 3.0V-5.0V, minimum starting voltage 0.35V, mainly used in solar harvesting, lithium battery solar charger, handheld audio player, mobile phone, e-book, electronic dictionary, wireless remote control and sensor node. This article introduces the main features, block diagrams and application circuits of the MB39C831, as well as the main indicators of the evaluation board MB39C831-EVB-03, block diagram, application connection diagram, and circuit diagram, bill of materials and PCB design.

The MB39C831 is the high-efficiency synchronous recTIficaTIon boost DC/DC converter IC which efficiently supplies energy getTIngfrom the solar cell with the single cell or mulTIple cells, or from the thermoelectric generator (TEG) to the Li-ion battery.

It contains the function to control the DC/DC converter output following the maximum power point of the solar cell (MPPT:

Maximum Power Point Tracking) and the protection function to charge the Li-ion battery safely.

It is possible to start-up from 0.35 V using the low-voltage process and adapts the applications which the single cell solar cell is treated as the input.

Main features of MB39C831:

 Operation input voltage range : 0.3 V to 4.75 V
 Output voltage adjustment range : 3.0 V to 5.0 V
 Minimum input voltage at start-up : 0.35 V
 Quiescent Current (No load) : 41 μA
 Input peak current limit : 200 mA
 Built-in MPPT
 Charge voltage to the Li-ion battery/current protection function built in
 Improvement of the efficiency during the low-output power according to the auto PFM/PWM switching mode

MB39C831 application:

 Solar energy harvesting
 Thermal energy harvesting
Li-ion battery using the single cell or multiple cells 'solar cell/Super Capacitor Charger
 Portable audio players
 Cellular phone
 eBook
 Electronic dictionary
 Wireless remote controllers
 Sensor node

Figure 1. Block diagram of MB39C831

Figure 2. MB39C831 application circuit diagram: Constant voltage mode (MPPT_ENA=L, ENA=H)

Figure 3. MB39C831 application circuit diagram: charging mode (MPPT_ENA=H, ENA=H)

Evaluation Board MB39C831-EVB-03

The MB39C831-EVB-03 is the evaluation board for the energy harvesting (Power Management) IC, MB39C831. This evaluation board is capable of accepting solar or thermal electric power source.

Figure 4. Outline drawing of evaluation board MB39C831-EVB-03 Evaluation board MB39C831-EVB-03 indicator:

Figure 5. Block diagram of the evaluation board MB39C831-EVB-03

Figure 6. Evaluation Board MB39C831-EVB-03 Charging Mode Solar Harvest Connection (MPPT Mode)

Figure 7. Evaluation Board MB39C831-EVB-03 Constant Pressure Mode Solar Harvest Connection

Figure 8. Evaluation board MB39C831-EVB-03 circuit diagram Evaluation board MB39C831-EVB-03 material list:

Figure 9. Evaluation Board MB39C831-EVB-03 PCB Design Drawing See:
with
002-08404_MB39C831_Ultra_Low_Voltage_Boost_Power_
Management_IC_for_Solar_Thermal_Energy_Harvesting_Datasheet.pdf
002-08406_MB39C831_Ultra_Low_Voltage_Boost_Power_
Management_IC_for_Solar_Thermal_Energy_Harvesting_Datasheet_Chinese.pdf
3512248-002-08720.pdf

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