Diodes Incorporated AP9211S-AM-HAC-7

Overview

AP9211S-AM-HAC-7 from Diodes Incorporated is a single-chip Li+ battery protection IC integrating dual n-channel MOSFETs (common drain) and precision voltage/current detection circuitry for 1-cell rechargeable battery packs. It provides overcharge (4.375 V ±25 mV), overdischarge (2.500 V ±35 mV), discharge/charge overcurrent (±15 mV accuracy), short-circuit (0.700 V ±100 mV), and overvoltage charger (8.0 V ±2 V) protection with fixed delay timing. Used in portable power tools, Bluetooth headsets, and medical wearables requiring compact, low-quiescent-current protection.

For engineers reviewing the AP9211S-AM-HAC-7 datasheet, AP9211S-AM-HAC-7 pinout, AP9211S-AM-HAC-7 application, or AP9211S-AM-HAC-7 equivalent, key selection criteria include integrated MOSFET R_SS(ON) (27 mΩ typ.), 0.1 µA max power-down current, U-DFN2030-6 (Type C) thermal pad layout, and factory-configured 0V charge permission and auto-release overdischarge mode.

Technical Context

The AP9211S-AM-HAC-7 implements independent analog comparators for VDD–VSS (cell voltage) and VM–VSS (current-sense voltage), each feeding into logic-controlled delay timers and MOSFET gate drivers. Its dual-MOSFET architecture uses S1/S2 as source terminals and EP as common drain, enabling bidirectional current control without external FETs.

Protection decisions are latched via internal state machine with configurable release conditions: overcharge releases at 4.175 V (ΔV = 0.2 V hysteresis), overdischarge releases at 2.900 V (ΔV = 0.4 V hysteresis), and short-circuit detection triggers within 1.2 µs (±20% tolerance). The device supports both power-down (0.1 µA) and auto-wake-up modes, selected at factory.

Key Specifications

Pinout & Package

AP9211S-AM-HAC-7 is housed in a 2.0 mm × 3.0 mm × 0.55 mm U-DFN2030-6 (Type C) package with exposed thermal pad (EP) for enhanced heat dissipation. The package requires solder mask defined pads and thermal vias under EP for reliable operation above 5 A continuous current.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5460N255AA-TR and BD8620GUL-EVK-1, AP9211S-AM-HAC-7 delivers lower system-level BOM cost through integration, superior shelf-life performance via 0.1 µA power-down, and guaranteed recovery from 0 V-critical for consumer and medical devices where battery handling is uncontrolled.

Availability

AP9211S-AM-HAC-7 is available at Aetrix Electronics and suitable for portable power tools, wireless headsets, and medical wearables requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP9211S-AM-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and protection applications.

The AP9211 belongs to Diodes' Battery Protection IC product line, engineered specifically for space-constrained, high-reliability 1-cell Li+ systems where integration, accuracy, and ultra-low standby power are mandatory design requirements.

FAQ

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

Pin 4 is internally not connected and must remain electrically floating-no trace, solder, or pull-up/down resistor should be attached. Connecting it risks latch-up or undefined behavior per DS37596 Rev. 6-3 Section 4. Pin Descriptions. This pin serves no functional role and exists solely for mechanical symmetry in the U-DFN2030-6 (Type C) package layout.

Does AP9211S-AM-HAC-7 support charging a fully depleted (0 V) battery?

Yes-this part is factory-configured with 0V battery charge permission (V0CHA = 1.2 V), enabling the charger to initiate current flow even when the cell voltage reads 0 V due to self-discharge. The IC monitors rising voltage and transitions to normal operation once VDD exceeds 1.2 V, eliminating need for external pre-charge circuitry.

How does the AP9211S-AM-HAC-7 handle overvoltage from non-standard chargers?

It uses a dedicated overvoltage charger detection circuit monitoring VDD–VM. When this differential exceeds 8.0 V (±2 V), the charge MOSFET turns off immediately-no delay-to protect against >5 V sources like USB PD adapters or automotive chargers. Release occurs at 7.3 V, restoring charge only when the unsafe condition clears.

What thermal design guidance applies to the EP pad?

The EP pad is the common drain node for both MOSFETs and must be connected to ≥20 mm² of top-layer copper with ≥4 thermal vias (0.3 mm diameter, filled) to inner ground plane. Per JEDEC High-K board data, this maintains junction temperature ≤110°C at 7.1 A continuous current and prevents solder joint fatigue during thermal cycling.