Diodes Incorporated AP9211SA-AD-HAC-7

Overview

AP9211SA-AD-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 (4.375 V ±25 mV), overdischarge (2.500 V ±35 mV), discharge/charge overcurrent (±15 mV accuracy), and short-circuit protection with fixed delay timing, enabling compact, component-saving battery management in portable power tools and wearables.

For engineers reviewing the AP9211SA-AD-HAC-7 datasheet, AP9211SA-AD-HAC-7 pinout, AP9211SA-AD-HAC-7 application, or AP9211SA-AD-HAC-7 equivalent, key selection criteria include its 0V battery charge permission, selectable auto-wake-up mode (vs. power-down), integrated 27 mΩ RSS(ON) MOSFETs, and ±100 mV short-circuit detection voltage tolerance - all critical for low-power, high-reliability battery pack safety design.

Technical Context

The AP9211SA-AD-HAC-7 implements independent voltage monitoring paths for VDD–VSS (cell voltage) and VM–VSS (current-sense differential), with dedicated comparators for overcharge, overdischarge, discharge/charge overcurrent, and short-circuit events. Its logic circuit uses internal delay timers (e.g., tCU = 1.0 s typ., ±20% at +25°C) to prevent false triggering during transient conditions.

It features two configurable operating modes: auto-wake-up (enabled in SA variant) allows recovery from overdischarge without external charger connection when battery voltage rises above VDU (2.900 V) and remains stable for tDLR (1.0 s typ.), while the built-in RVMD/RVMS resistive networks enable automatic VM biasing during fault states to sustain accurate current sensing and release control.

Key Specifications

Pinout & Package

AP9211SA-AD-HAC-7 is housed in a thermally enhanced U-DFN2030-6 (Type C) package with exposed thermal pad (EP), requiring PCB copper pour for effective heat dissipation during high-current discharge events.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5640T252CD-TR and BD8620GUL, AP9211SA-AD-HAC-7 uniquely combines 0V charge permission, auto-wake-up, and sub-1 µs short-circuit response in a thermally optimized 2.0 × 3.0 mm DFN - making it optimal for high-reliability, maintenance-free battery packs where field recovery and fault robustness are non-negotiable.

Availability

AP9211SA-AD-HAC-7 is available at Aetrix Electronics and suitable for power tools, wireless headsets, medical wearables, and smart home sensors requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP9211SA-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, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP9211 belongs to Diodes' battery protection IC product line, engineered specifically for space-constrained, high-safety 1-cell Li+ applications - emphasizing integrated MOSFETs, ultra-low IQ, and factory-configurable protection thresholds to simplify qualification and accelerate time-to-market.

FAQ

What is the function of the NC pin (Pin 4) on AP9211SA-AD-HAC-7?

Pin 4 is internally not connected and must remain electrically floating - no trace, solder, or pull-up/pull-down component should be attached. Connecting it risks internal latch-up or undefined behavior, as confirmed in Diodes' DS37596 Rev. 6 Section "Pin Descriptions". This pin serves no functional role and exists solely for mechanical symmetry in the U-DFN2030-6 (Type C) package layout.

Does AP9211SA-AD-HAC-7 support reverse polarity protection for the charger input?

Yes - reverse polarity protection is implemented via external resistors R1 (330–470 Ω between VDD and P+) and R2 (2.7 kΩ between P− and VM). When charger polarity is reversed, these resistors limit fault current and dissipate energy, preventing damage to the AP9211SA-AD-HAC-7 or battery. The datasheet explicitly states R1/R2 act as "current limit resistors if the battery or charger is connected reversely" (DS37596 p.2, Note 4).

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

The SA suffix denotes auto-wake-up mode: during overdischarge, the IC remains active and monitors battery voltage; recovery occurs automatically when VBAT ≥ 2.900 V and holds for ≥1.0 s. In contrast, power-down mode (standard AP9211S) forces deep sleep (0.1 µA IQ) and requires external charger connection to exit overdischarge - no autonomous recovery is possible. This distinction is factory-set and non-configurable post-manufacture.

Can AP9211SA-AD-HAC-7 be used in 2-cell battery packs?

No - AP9211SA-AD-HAC-7 is strictly rated for 1-cell Li+ operation, with absolute maximum VDD–VSS = 12 V and recommended operating range of 1.5–5.5 V. Its overcharge detection (4.375 V) and overdischarge (2.500 V) thresholds are calibrated for single-cell voltage profiles. Using it in 2-cell configurations would result in premature overcharge cutoff (~4.4 V per cell = 8.8 V total) or failure to detect true cell imbalance, violating UL 2054 and IEC 62133 safety requirements.