Industrial BMIC Solutions

Fail-Safe Battery Monitoring — From 18 V Tools to Grid-Scale ESS

±2.5 mV accuracy, built-in hardware self-diagnostics, and 260 µA operation. One BMIC family spanning 4S packs to 880-cell stacked architectures — backed by complete BMS reference designs with Nuvoton Cortex‑M MCUs, SDK, and drivers.

Get the Eval Board → ⬇ KA49702A Datasheet Find Your BMIC ↓

12V–3kV

System Voltage Range

±2.5mV

Measurement Accuracy

260µA

Operating Current

880S

Max Cells, Stacked

BMIC Product Series — Industrial & Automotive

Product Lineup

Complete BMIC Family

From compact low-voltage non-stackable designs to high-voltage stackable architectures — Nuvoton has a BMIC solution for every application.

Non-Stackable · Low Side

KA49701A

Up to 72 V

17-channel low-side driver BMIC for cost-optimized industrial battery packs in power tools, portable ESS, and light EVs.

Cell Count4S – 17S
FET DriverLow Side
Accuracy±2.9mV @25℃
Supply Current260 µA
Cell BalanceYes (odd/even)
Fault ProtectionOV/UV, OC/UC, OT/UT
DiagnosticsCurrent ADC
PackageQFP48
GradeIndustrial

KA49701A

Non-Stackable · High Side

KA49702A

Up to 72 V

17-channel high-side driver BMIC for wider voltage range applications including e-mobility, golf carts, and residential low-voltage ESS.

Cell Count4S – 17S
FET DriverHigh Side
Accuracy±2.9mV @25℃
Supply Current260 µA
Cell BalanceYes (odd/even)
Fault ProtectionOV/UV, OC/UC, OT/UT
DiagnosticsCurrent ADC
PackageQFP48
GradeIndustrial

KA49702A

Stackable · Industrial

KA49703A

>72 V to ~3 kV

16-channel stackable BMIC for high-voltage ESS, grid storage, and residential/commercial solar systems. Up to 55 BMICs stackable for 880 cells series total / ~3kV architectures.

Cell Count16S per IC
Accuracy±2.5mV @25℃
Supply Current260 µA
Cell BalanceYes (adjacent simultaneous)
Fault ProtectionOV/UV, OT/UT
ArchitectureDaisy-chain
PackageQFP48
PMICKA84917
GradeIndustrial

KA49703A KA84917

Side-by-Side

BMIC Family Comparison

Every key spec in one table — the way engineers actually evaluate parts.

Specification	KA49701A	KA49702A	KA49703A
Topology	Non-stackable	Non-stackable	Stackable · daisy-chain
System Voltage	Up to 72 V	Up to 72 V	>72 V to ~3 kV
Cell Count	4S – 17S	4S – 17S	16S per IC · up to 55 ICs / 880S
FET Driver	Low side	High side	— (pack control via BMS MCU)
Accuracy @ 25 ℃	±2.9 mV	±2.9 mV	±2.5 mV
Operating / Shutdown Current	260 µA / <0.1 µA	260 µA / <0.1 µA	260 µA
Cell Balancing	Odd / even	Odd / even	Adjacent, simultaneous
Fault Protection	OV/UV, OC/UC, OT/UT	OV/UV, OC/UC, OT/UT	OV/UV, OT/UT
Self-Diagnostics	ADC, MUX, FET, fuse, open-wire	ADC, MUX, FET, fuse, open-wire	MUX, daisy-chain integrity
Companion PMIC	—	—	KA84917 pack monitor
Package / Grade	QFP48 · Industrial	QFP48 · Industrial	QFP48 · Industrial
Reference Design	Non-Stack RD1 (M2L3x MCU)	Non-Stack RD1 (M2L3x MCU)	Stackable RD1 (M33x / M3351 MCU)
Best For	Cost-optimized packs	Widest 12–72 V flexibility	HV ESS, grid & industrial storage

Summary only — always confirm against the latest datasheet for your design.

Nuvoton KA49702A BMIC Evaluation Board — complete development platform for 4S–17S battery systems.

Product Overview

KA49702A: Purpose-Built for Reliable 18V to 60V Batteries

The KA49702A BMIC enables efficient battery capacity utilization with high voltage measurement accuracy, advanced safety/diagnostics features, and low power operation.

17 cell LFP, NMC monitoring
Over Temp, Under Temp, Over Voltage, Under Voltage, Over Current Monitoring
Built-in self-diagnostics: ADC, MUX, FET, Fuse, Open Wire
+/− 2.9mV Accuracy with Hardware Cell Voltage Measurement Averaging
Only 260 µA operating current and <0.1 µA Shutdown
12V–60V Full BMS Reference Design

Reference Designs & Development Boards (ARM Cortex)

Accelerate Your Development

SDK, HDK, Device Drivers, Development Support — ready-to-use BMS reference designs that reduce engineering risk and compress time-to-market.

Design Type	BMIC	MCU	Voltage Range	Target Application	Key Features
Non-Stack RD1	KA49702A 17ch	M2L3x – Low-Power M23	16–60 V · 4S–17S	Power tools, portable batteries, medical	Low power, built-in LCD Driver, cap touch
Stackable RD1	KA49703A 16ch	M33x / M3351 (M33 \| M55)	>100 V	ESS, industrial storage, commercial storage	Isolated Daisy-chained PCBs with BMIC, Pack Monitoring PMIC, Isolated Communications COMM IC, MCU

One Vendor. Zero Integration Risk.

BMIC, pack-monitoring PMIC, isolated communications IC, Cortex-M MCU, SDK, and drivers — a complete BMS chipset from a single supplier. Fewer vendors to qualify, no cross-vendor integration risk, one support channel.

BMICKA4970xA

→

PMICKA84917

→

COMM ICIsolated daisy-chain

→

MCUM2L3x / M33x

→

SDKDrivers + ref code

Hardware Diagnostics

Fail-Safe by Design

Built-in self-diagnostics verify the monitoring path itself — so your BMS can prove its measurements are trustworthy, not just take them.

📈

ADC Self-Test

On-demand verification of the measurement ADC confirms cell-voltage readings remain within specification over the life of the pack.

🔀

MUX Diagnostics

Input multiplexer checks detect stuck or shorted channels before they corrupt pack-level decisions.

⚡

FET & Fuse Diagnostics

Driver and fuse path verification ensures protection actuators will actually respond when commanded.

🔌

Open-Wire Detection

Detects broken cell-tap connections — a critical failure mode in vibration-heavy industrial environments.

🎯

Hardware Averaging

Cell-voltage measurement averaging in silicon delivers ±2.9 mV (±2.5 mV stackable) accuracy without MCU overhead.

🔋

Ultra-Low Power

260 µA operating and <0.1 µA shutdown protect shelf life and minimize parasitic drain on the pack.

Product Literature

Resources & Downloads

Datasheets, reference designs, brochures, and technical resources for the Nuvoton BMIC portfolio.

📄

Product Brochure

Fail-Safe BMIC with Hardware Diagnostics — full feature overview of the KA49701A/702A family.

⬇ Download PDF

📊

Nuvoton BMIC Portfolio Overview

Complete overview of the Nuvoton battery monitoring IC product family.

⬇ Download PDF

📐

KA49702A 17-ch Non-Stackable BMIC Datasheet

Full electrical specifications, timing diagrams, and register maps for the KA49702A.

⬇ Download 🔗 Webpage

📋

Reference Design User Manual

Hardware and software guide for the 4S–17S complete BMS reference design.

⬇ Download

📐

KA49703A 16-ch Stackable BMIC Datasheet

16-channel stackable BMIC for high-voltage ESS up to ~3 kV. Request access below.

🔒 Request Datasheet

🔗

Nuvoton BMIC Home Page

Full battery monitoring IC product family, datasheets, tools, and support on Nuvoton.com.

🔗 Visit Page

Get Hands-On

Start Your Design

Request an eval board, samples, the KA49703A stackable datasheet, or a consultation with a field application engineer.