Diodes Incorporated AP9211S-AD-HAC-7

Overview

AP9211S-AD-HAC-7 from Diodes Incorporated is a single-chip Li+ battery protection IC integrating dual N-channel MOSFETs (common-drain configuration), overcharge/overdischarge voltage detection (±25 mV accuracy at +25°C), discharge overcurrent sensing (0.05–0.32 V range, ±15 mV accuracy), and short-circuit protection (0.45–0.7 V, ±100 mV). It operates in 1-cell lithium-ion battery packs for portable power tools and medical handheld devices.

For engineers reviewing the AP9211S-AD-HAC-7 datasheet, AP9211S-AD-HAC-7 pinout, AP9211S-AD-HAC-7 application, or AP9211S-AD-HAC-7 equivalent, key selection criteria include its U-DFN2030-6 (Type C) package, 0.1 µA max power-down current, factory-configured 0V charge permission, selectable power-down mode, and integrated MOSFET R_SS(ON) of 27 mΩ (typ) at V_DD = 4.0 V.

Technical Context

The AP9211S-AD-HAC-7 implements independent analog comparators for overcharge (VCU = 4.375 V, VCL = 4.175 V), overdischarge (VDL = 2.500 V, VDU = 2.900 V), and overcurrent (VDOC = 0.095 V, VCOC = −0.095 V), each with fixed delay timers (tCU = 1.0 s typ, tDOC = 12 ms typ) and ±20% tolerance. Its VM pin senses bidirectional current via external sense resistor R2, enabling separate charge/discharge FET control logic.

It features two internal pull-up/pull-down resistors (RVMD = 300 kΩ typ, RVMS = 30 kΩ typ) that dynamically configure VM biasing during fault states-RVMD pulls VM to VDD in overdischarge, while RVMS pulls VM to VSS during discharge overcurrent-to ensure reliable MOSFET gate drive and automatic recovery upon fault clearance.

Key Specifications

Pinout & Package

AP9211S-AD-HAC-7 uses the U-DFN2030-6 (Type C) thermally enhanced package with exposed thermal pad (EP) connected to common drain of both MOSFETs. PCB layout requires large copper area under EP for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-cell Li+ battery protection applications.

Compared with S-8261AAB-M6T1U and RP506K001B-TR-F, the AP9211S-AD-HAC-7 delivers lower system-level BOM cost via integrated MOSFETs, superior voltage accuracy (±25 mV vs. ±50 mV), and configurable 0V charge-critical for medical and industrial applications where unattended battery recovery is mandatory.

Availability

AP9211S-AD-HAC-7 is available at Aetrix Electronics and suitable for power tools, medical handheld devices, wearables, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP9211S-AD-HAC-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management and protection solutions for industrial, computing, and consumer markets.

The AP9211 belongs to Diodes' Battery Protection IC product line, engineered specifically for compact, high-accuracy 1-cell Li+ battery management in space-constrained portable electronics with stringent safety and longevity requirements.

FAQ

What is the function of the NC pin (Pin 4) on AP9211S-AD-HAC-7?

Pin 4 is a no-connect terminal with no internal connection or electrical function. It must remain unconnected and floating in the PCB layout. Soldering or routing to this pin may cause unpredictable behavior or damage due to potential internal floating node coupling. Diodes Incorporated explicitly states this pin has zero functional role in the device operation or protection logic.

How does the AP9211S-AD-HAC-7 handle 0V battery charging, and is external circuitry required?

The AP9211S-AD-HAC-7 includes factory-configured 0V battery charge permission, allowing the charger to initiate charging even when the cell voltage reads 0 V due to self-discharge. No external wake-up circuitry, boost converter, or auxiliary power source is needed-the IC automatically enables the charging MOSFET once the charger applies voltage above V0CHA (1.2 V min) to the battery terminals.

What is the maximum continuous discharge current supported by the integrated MOSFETs?

The integrated dual N-channel MOSFETs support 9.0 A continuous drain current at +25°C ambient (TA) with VGS = 4.5 V, derating to 7.1 A at +70°C. This rating assumes proper PCB thermal design: ≥200 mm² copper area under the EP pad, 2 oz copper layers, and minimal trace resistance. Exceeding these conditions risks junction temperature exceeding +150°C and permanent device failure.

Can the overcharge detection voltage be adjusted externally, or is it fixed per part number?

The overcharge detection voltage (VCU = 4.375 V) and release voltage (VCL = 4.175 V) are factory-laser-trimmed and fixed for AP9211S-AD-HAC-7; no external resistor network or capacitor can adjust them. These values are permanently set during wafer sort and cannot be modified in-system. Alternate versions (e.g., AP9211S-AA-HAC-7) offer different factory-programmed thresholds but require separate ordering.