Diodes Incorporated AP9211S-AC-HAC-7

Overview

AP9211S-AC-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, designed for 1-cell rechargeable battery packs. It delivers overcharge detection at 4.375 V ±25 mV, overdischarge detection at 2.500 V ±35 mV, and discharge overcurrent detection at 0.095 V ±15 mV, enabling autonomous protection without external timing components in portable power tools and Bluetooth headsets.

For engineers reviewing the AP9211S-AC-HAC-7 datasheet, AP9211S-AC-HAC-7 pinout, AP9211S-AC-HAC-7 application, or AP9211S-AC-HAC-7 equivalent, this page provides verified functional roles, validated pin-level circuit behavior, confirmed thermal pad implementation guidance, and real-world protection timing constraints - all derived from Diodes' DS37596 Rev. 6-3 datasheet.

Technical Context

The AP9211S-AC-HAC-7 implements independent voltage monitoring paths for VDD–VSS (cell voltage), VM–VSS (current-sense differential), and VDD–VM (charger overvoltage), each with dedicated comparators and fixed delay timers (e.g., tCU = 1.0 s typ., ±20% accuracy). Its logic circuit enforces strict state transitions: overcharge disables only the charge MOSFET (S2), while overdischarge disables only the discharge MOSFET (S1), preserving charger connectivity during deep discharge recovery.

Internal resistive networks RVMD (150–500 kΩ) and RVMS (10–50 kΩ) provide programmable pull-up/pull-down on VM during fault states to ensure reliable release conditions - e.g., RVMD pulls VM to VDD in overdischarge to signal charger presence, while RVMS pulls VM to VSS during short-circuit to force VM ≈ VSS upon load removal for automatic recovery.

Key Specifications

Pinout & Package

U-DFN2030-6 (Type C) package with 0.5 mm pitch, 2.0 × 3.0 mm body, and exposed thermal pad (EP) electrically tied to common drain of internal MOSFETs. Requires solder mask defined pads and ≥200 mm² copper area under EP for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5602T001B-TR, AP9211S-AC-HAC-7 saves board space and simplifies layout but fixes R_SS(ON) at 27 mΩ; compared with BD86300GUL, it offers tighter overcurrent detection (0.095 V vs. 0.125 V) for precision low-power applications but consumes less current in sleep mode (0.1 µA vs. 0.5 µA).

Availability

AP9211S-AC-HAC-7 is available at Aetrix Electronics and suitable for power tools, wireless headsets, medical wearables, and smart home sensors requiring stable component supply, automotive-grade traceability, and long-lifecycle support.

Supply support for AP9211S-AC-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 manufacturing certified to IATF 16949 and product qualification per AEC-Q100/101 standards.

The AP9211 belongs to Diodes' battery protection IC product line, engineered specifically for space-constrained, cost-sensitive 1-cell Li+ applications where integration, ultra-low quiescent current, and factory-programmable safety thresholds are critical.

FAQ

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

Pin 4 is a no-connect terminal with no internal bond wire or circuit connection. It must remain unconnected on the PCB - neither routed nor soldered - to avoid parasitic coupling or mechanical stress on the die. Diodes specifies this pin as floating in all layout guidelines and confirms zero electrical function in DS37596 Rev. 6-3 Section 4.

Can AP9211S-AC-HAC-7 support 0V battery charging, and how is it enabled?

Yes - the "AC" suffix indicates factory-programmed 0V battery charge permission. When enabled, the device allows charging current to flow into a fully depleted cell (0 V) once VDD rises above 1.2 V, bypassing the normal under-voltage lockout. This is implemented via internal fuse configuration and requires no external components or firmware control.

How does the EP (exposed pad) connect electrically, and what is its role in thermal management?

The EP is internally connected to the common drain node of both integrated N-MOSFETs and must be soldered to a minimum 200 mm² copper pour on the PCB. This thermal pad conducts heat directly from the MOSFET junctions to the board, achieving ≤45°C/W junction-to-board resistance - critical for sustaining 9.0 A continuous discharge without exceeding 150°C maximum junction temperature.

What distinguishes the power-down mode from auto-wake-up mode in AP9211S-AC-HAC-7?

This part uses power-down mode (indicated by blank suffix per ordering table), where the IC enters ultra-low-current sleep (<0.1 µA) during overdischarge and requires charger connection to wake. Auto-wake-up mode (suffix "A") keeps the IC active in overdischarge, allowing recovery when battery voltage rises above VDU - but AP9211S-AC-HAC-7 lacks this feature per Diodes' ordering matrix and datasheet Section 13.