Diodes Incorporated AP9211SA-AF-HAC-7

Overview

AP9211SA-AF-HAC-7 from Diodes Incorporated is a single-chip Li+ battery protection IC integrating dual n-channel MOSFETs (common-drain) in U-DFN2030-6 (Type C) package. It provides overcharge (4.375 V ±25 mV), overdischarge (2.500 V ±35 mV), discharge/charge overcurrent (±15 mV accuracy), and short-circuit (0.700 V ±100 mV) protection for 1-cell Li-ion packs, with fixed 8.0 V overvoltage charger detection and 0V battery charge permission.

For engineers reviewing the AP9211SA-AF-HAC-7 datasheet, AP9211SA-AF-HAC-7 pinout, AP9211SA-AF-HAC-7 application, or AP9211SA-AF-HAC-7 equivalent, key selection criteria include integrated MOSFET R_SS(ON) (27 mΩ typ. @ 4.0 V), ultra-low 3.0 µA normal-mode quiescent current, selectable power-down vs. auto-wake-up mode, and factory-configured 0V charge enable - critical for portable medical devices, power tools, and wearables requiring fail-safe battery management.

Technical Context

The AP9211SA-AF-HAC-7 implements independent voltage monitoring paths for VDD–VSS (cell voltage) and VM–VSS (current-sense differential), with dedicated comparators for overcharge, overdischarge, and overcurrent events. Its logic circuit uses fixed delay timers (e.g., t_CU = 1.0 s typ.) and hysteresis-controlled release thresholds to prevent oscillation during marginal conditions.

It features two internal resistive networks: RVMD (300 kΩ typ. between VDD and VM) for overdischarge wake-up pull-up, and RVMS (30 kΩ typ. between VM and VSS) for short-circuit detection pull-down. The device operates across –40°C to +85°C with supply voltage range 1.5–5.5 V and supports reverse-polarity protection via external R1/R2 current-limiting resistors.

Key Specifications

Pinout & Package

AP9211SA-AF-HAC-7 is housed in a thermally enhanced U-DFN2030-6 (Type C) package with exposed thermal pad (EP), optimized for compact Li-ion pack PCB layouts requiring minimal footprint and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAB-M6T1U and RP502K001B-TR-F, the AP9211SA-AF-HAC-7 uniquely combines integrated MOSFETs, factory-set 0V charge, and 8.0 V overvoltage charger detection - delivering higher functional integration and safer field recovery for consumer and medical 1S battery systems.

Availability

AP9211SA-AF-HAC-7 is available at Aetrix Electronics and suitable for power tool battery packs, wireless headset charging cases, portable medical monitors, and smart home sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP9211SA-AF-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers in Asia, Europe, and the US, and manufacturing in IATF 16949-certified facilities.

The AP9211 belongs to Diodes' battery protection IC product line, engineered specifically for space-constrained, cost-sensitive 1-cell Li-ion applications demanding high accuracy, ultra-low power, and integrated MOSFETs - eliminating external components while meeting IEC 62133 safety requirements.

FAQ

What is the maximum continuous discharge current supported by AP9211SA-AF-HAC-7?

The device supports 9.0 A continuous discharge current at +25°C with V_GS = 4.5 V, based on its integrated MOSFETs' R_SS(ON) of 27 mΩ typ. At +70°C, derating reduces this to 7.1 A. Actual current capability depends on PCB copper area, ambient temperature, and thermal pad soldering quality - a minimum 25 mm² exposed EP copper is recommended for 6 A sustained operation.

How does the auto-wake-up mode differ from power-down mode in AP9211SA-AF-HAC-7?

Auto-wake-up mode (SA suffix) keeps the IC active during overdischarge, allowing recovery when battery voltage rises above V_DU (2.900 V) without charger connection. Power-down mode (standard S variant) forces deep sleep (0.1 µA) and requires charger application to exit overdischarge. The SA version is factory-configured and cannot be changed in-circuit.

Can AP9211SA-AF-HAC-7 protect against charger overvoltage without external components?

Yes. It includes a dedicated overvoltage charger detection circuit with fixed 8.0 V threshold (±2 V) between VDD and VM pins. When exceeded, it immediately disables the charging MOSFET without delay or external components. Release occurs at 7.3 V, also with no hysteresis or external timing elements required.

What is the role of the VM pin in AP9211SA-AF-HAC-7's protection functions?

The VM pin senses voltage drop across external sense resistor R2 to determine charge/discharge current direction and magnitude. It enables discharge overcurrent (V_DOC = 0.150 V), short-circuit (V_SHORT = 0.700 V), and charge overcurrent (V_COC = –0.150 V) detection. Internal RVMD/RVMS networks connect VM to VDD or VSS during fault states to stabilize sensing and enable auto-release behavior.