PMIC - Battery Management

Part Number	Description / PDF	Quantity
BQ2945SN-C409 Texas Instruments	IC BATT PWR SUPPLY CIRC FIXED	13566
BQ771802DPJT Texas Instruments	BQ7718 FAMILY 2-5S OVERVOLTAGE P	250
TPS65810RTQT Texas Instruments	IC BATT MFUNC LI-ION 1CELL 56QFN	2180
BQ2084DBTR-V143G4 Texas Instruments	IC GAS GAUGE FOR BQ29312 38TSSOP	0
BQ7692000PW Texas Instruments	IC BATT MON MULTI 3-5C 20TSSOP	11050
BQ27520YZFT-G2 Texas Instruments	IC BATT MON LI-ION 1CELL 15DSBGA	2129
BQ34Z100PWR-G1 Texas Instruments	IC BATT MON MULTI-CHEM 14TSSOP	0
BQ20Z80ADBTR-V110 Texas Instruments	IC BATT PWR SUPPLY MGMT CIRC	2500
UCC3957MTR-1 Texas Instruments	IC BATT PROT LI-ION 3-4CL 16SSOP	500
BQ29419PW Texas Instruments	IC BATT PROT LI-ION 2-4CL 8TSSOP	16490
TPS650242RHBT Texas Instruments	IC BAT PWR MGMT LI-ION 1C 32VQFN	5498
BQ294532DRVT Texas Instruments	IC BATT PROT LI-ION 2-3CEL 6WSON	1250
BQ77908ADBT Texas Instruments	IC BAT MFUNC LI-ION 4-8C 38TSSOP	1405
BQ26501PWG4 Texas Instruments	IC GAS GAUGE LI-ION 1CELL 8TSSOP	0
BQ29443DRBR Texas Instruments	IC BATT PROT LI-ION 2-4CELL 8SON	0
BQ29312PWR Texas Instruments	IC BATT PROT LI-ION 2-4C 24TSSOP	96967
BQ2018TS-E1 Texas Instruments	IC BAT MON MULT-CHEM 1-4C 8TSSOP	83
BQ29701DSER Texas Instruments	IC BATT PROT LI-ION 1CELL 6WSON	0
BQ296103DSGT Texas Instruments	IC BATT PROT LI-ION 2-4CEL 8WSON	463
BQ34Z100PWR Texas Instruments	IC BATT MON MULTI-CHEM 14TSSOP	11568

PMIC - Battery Management

1. Overview

Power Management Integrated Circuits (PMICs) with Battery Management functionality are specialized semiconductor devices designed to monitor, control, and optimize battery operations in electronic systems. These ICs handle critical tasks including charging control, discharge regulation, capacity monitoring, and safety protection. Their importance has grown exponentially with the proliferation of portable electronics, electric vehicles, and energy-harvesting systems, where battery efficiency and safety are paramount.

2. Major Types & Functional Classification

Type	Functional Features	Application Examples
Battery Charge Management ICs	Support Li-ion/Polymer, NiMH, and lead-acid chemistries; implement CC/CV charging, thermal regulation	Smartphones, power banks
Fuel Gauge ICs	Impedance tracking, voltage-based SOC estimation, data logging	Laptops, medical devices
Battery Protection ICs	Overvoltage, overcurrent, short-circuit, and temperature protection	E-bikes, battery packs
Power Path Management ICs	Dynamic power distribution between charger and system load	Tablets, drones

3. Structure & Composition

A typical PMIC Battery Management IC integrates:

Analog Front-End (AFE) with precision ADC/DAC
Digital control logic (state machines or embedded microcontrollers)
Communication interfaces (I2C, SMBus, SPI)
High-side/low-side MOSFET drivers
Temperature sensing elements
Non-volatile memory for calibration data

Advanced packages (QFN, BGA) enable high integration while maintaining thermal performance.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Charging Current Range	100mA - 5A	Determines charge speed and battery size compatibility
SOC Estimation Accuracy	1-5%	Impacts runtime prediction reliability
Quiescent Current	1-20 A	Crucial for standby power efficiency
Communication Speed	400kHz - 3.4MHz (I2C)	Affects system responsiveness
Operating Temperature	-40 C to +125 C	Determines environmental robustness

5. Application Fields

Consumer Electronics: Smartphones (Apple iPhone PMICs), Smartwatches (Fitbit Charge series)
Medical Devices: Portable ultrasound machines (Philips Lumify), infusion pumps
Automotive: EV battery packs (Tesla Model 3 BMS), start-stop systems
Industrial: Robotics (Boston Dynamics Atlas), energy storage systems

6. Leading Manufacturers & Products

Manufacturer	Representative Product	Key Features
Texas Instruments	BQ25790	Single-chip solution with USB PD 3.0, 3.5A charging
Analog Devices	MAX17055	ModelGauge m3 algorithm, 60s runtime prediction
STMicroelectronics	STM32F051x	Cortex-M0 core with integrated Li-ion charger
NXP Semiconductors	PF1550	PMIC for i.MX8 processors with dynamic voltage scaling

7. Selection Guidelines

Key considerations:

Battery chemistry compatibility (Li-ion requires CC/CV profile)
System voltage requirements (USB PD needs 5-20V support)
Form factor constraints (Wearable devices demand WCSP packages)
Communication protocol compatibility (I2C vs. SMBus vs. HDQ)
Safety certifications (UL 1642 for lithium batteries)
Software ecosystem (development tools and reference designs)

Example: For a 2-cell Li-ion notebook battery, select a multi-cell fuel gauge (e.g., BQ30z55) with SHA-256 authentication and PC companion software support.

8. Industry Trends

Integration of wireless charging (Qi standard) with battery management
Adoption of AI algorithms for adaptive charging profiles
Development of ultra-low-power PMICs for IoT edge devices
Increase in ASIL-D rated automotive-grade PMICs for EVs
Transition to 3D packaging for higher functional density
Growing adoption of battery health analysis (BHA) algorithms