Ultra-Low-Power MCU (e.g., STM32L0 or MSP430)
MIC2778 Li-Ion Battery Protection Circuit
Overview
Cost-optimized battery protection circuit using MIC2778-1YM5 for single-cell Li-Ion/Li-Po powered portable consumer electronics.
jmal amjedSystem architecture
POWER
ACTUATOR
MCU
- BATTERY → PROTECTION_ICPowerDirect cell voltage connection for monitoring and fault detection
- PROTECTION_IC → MOSFET_BLOCKGPIOGate drive signals for charge and discharge switch control
- BATTERY → LDO_REGULATORPowerProtected battery rail input to power management LDO
- LDO_REGULATOR → MCUPowerRegulated 3.3V system power supply rail
- BATTERY → MCUADCHigh-impedance resistive voltage divider for battery telemetry monitoring
Bill of materials
| Part number | Type | Component | Manufacturer | Package | Qty | Datasheet | Match |
|---|---|---|---|---|---|---|---|
| Li-ion Battery HAT | POWER | Single-Cell Li-Ion/Li-Po Battery Main energy storage and power source | Waveshare | — | 1 | Matched | |
9 alternatives consideredAI verified | |||||||
| DW01-TD | POWER | Texas Instruments BQ2970 Hardware-enforced overvoltage, undervoltage, and overcurrent protection | TDSEMIC | SOT-23-6 | 1 | Matched | |
10 alternatives consideredAI verified | |||||||
| EFC3J018NUZTDG | ACTUATOR | Dual N-Channel Common-Drain MOSFETs High-current path isolation during fault conditions | Catalyst Semiconductor, Inc. | WLCSP-6 | 1 | Matched | |
6 alternatives consideredAI verified | |||||||
| TPS7A0233PDBVR | POWER | Ultra-Low Iq LDO (e.g., TPS7A02) Step down cell voltage to steady 3.3V system rail with sub-microamp Iq | Texas Instruments | SOT-23-5 | 1 | Matched | |
15 alternatives consideredAI verified | |||||||
| STM32L011F4P6 | MCU | Ultra-Low-Power MCU (e.g., STM32L0 or MSP430) Monitor system telemetry, voltage, and manage low-power states | STMicroelectronics | TSSOP-20 | 1 | Matched | |
9 alternatives consideredAI verified | |||||||
Build guide
3-5 hoursIntermediate
1
Procurement & Preparation
- Procure all required BOM components including Li-ion Battery HAT, DW01-TD protection IC, EFC3J018NUZTDG dual N-channel MOSFET, TPS7A0233PDBVR LDO regulator, and STM32L011F4P6 MCU.
- Prepare the ESD-safe workstation, ground mat, and soldering iron with temperature control set to 350 degrees Celsius.
2
Hardware Assembly & Wiring
- Solder the DW01-TD protection IC and EFC3J018NUZTDG dual N-channel MOSFET block onto the PCB power-path section.
- Mount and solder the TPS7A0233PDBVR ultra-low Iq LDO regulator and the STM32L011F4P6 MCU onto the digital control section.
- Connect the Li-ion Battery HAT power terminals (BAT+, CELL-, VBAT, GND) and wire the COUT/DOUT protection signals and BAT_SENSE ADC line.
3
Firmware Setup
- Connect the ST-Link programmer to the SWD pins of the STM32L011F4P6 MCU.
- Compile and flash the firmware to configure the ADC for reading BAT_SENSE telemetry and managing low-power sleep modes.
4
Testing & Calibration
- Measure the steady output of the TPS7A0233PDBVR LDO using a digital multimeter to confirm a stable 3.3V system rail.
- Simulate an overvoltage and undervoltage fault condition using a programmable DC power supply to verify DW01-TD and MOSFET block isolation.
Document
battery protection circuit
Cost-optimized battery protection circuit using MIC2778-1YM5 for single-cell Li-Ion/Li-Po powered portable consumer electronics.
Design Overview
| Item | Details |
|---|---|
| Product Type | battery protection circuit |
| Key Functions | Single-cell Li-Ion/Li-Po battery voltage monitoring, Overvoltage and undervoltage protection, Low quiescent current power management |
| Power Source | Li-Ion Battery |
| Connectivity | |
| Size | Standard handheld enclosure |
| Environment | Portable consumer electronics |
| Difficulty | Intermediate |
| Est. Time | 3-5 hours |
System Architecture
Power Topology: The battery connects directly to the BQ2970 protection IC and back-to-back N-Channel MOSFETs on the negative return path for hardware safety. The protected battery rail feeds an ultra-low quiescent current LDO (sub-1uA Iq) to generate a stable 3.3V rail for the MCU and telemetry monitoring circuits.
Module List
| Module ID | Type | Name | Function | Voltage |
|---|---|---|---|---|
| BATTERY | POWER | Single-Cell Li-Ion/Li-Po Battery | Main energy storage and power source | 3.7V |
| PROTECTION_IC | POWER | Texas Instruments BQ2970 | Hardware-enforced overvoltage, undervoltage, and overcurrent protection | 3.7V |
| MOSFET_BLOCK | ACTUATOR | Dual N-Channel Common-Drain MOSFETs | High-current path isolation during fault conditions | 3.7V |
| LDO_REGULATOR | POWER | Ultra-Low Iq LDO (e.g., TPS7A02) | Step down cell voltage to steady 3.3V system rail with sub-microamp Iq | 3.7V |
| MCU | MCU | Ultra-Low-Power MCU (e.g., STM32L0 or MSP430) | Monitor system telemetry, voltage, and manage low-power states | 3.3V |
Key Components
5/5 modules matched to real parts. See the BOM tab for the full component table.
Single-Cell Li-Ion/Li-Po Battery (Li-ion Battery HAT)
The module is a Single-Cell Li-Ion/Li-Po Battery and energy storage source; candidate 6 (Li-ion Battery HAT by Waveshare
Texas Instruments BQ2970 (DW01-TD)
DW01-TD is a classic and direct functional alternative/equivalent for single-cell lithium-ion battery protection ICs lik
Ultra-Low Iq LDO (e.g., TPS7A02) (TPS7A0233PDBVR)
Exact match for the requested part number TPS7A0233PDBVR.
Ultra-Low-Power MCU (e.g., STM32L0 or MSP430) (STM32L011F4P6)
The user searched specifically for STM32L011F4P6, which corresponds to candidate 1 (STM32L0 series ultra-low-power MCU).
Build Summary
- Difficulty: Intermediate
- Estimated time: 3-5 hours
- Tools required: Soldering Iron, Hot Air Rework Station, Digital Multimeter, Oscilloscope, Programmable DC Power Supply, ST-Link V2 Programmer
See the Build tab for the full step-by-step assembly guide.
Generated by YuanQi AI Design System · Query: Design a battery protection circuit using MIC2778-1YM5