Diodes Incorporated AP9101CK-AETRG1

Overview

AP9101CK-AETRG1 from Diodes Incorporated is a single-chip lithium-ion battery protection IC for 1-cell packs, featuring overcharge detection at 4.200V ±25mV, overdischarge release at 3.000V ±35mV, discharge overcurrent detection at 0.300V ±15mV, short-circuit detection at 0.550V ±100mV, and charge overcurrent detection at −0.100V ±15mV. It integrates fixed-delay timing, 0V battery charge enable, and selectable power-down mode in SOT25 package.

For engineers reviewing the AP9101CK-AETRG1 datasheet, AP9101CK-AETRG1 pinout, AP9101CK-AETRG1 application, or AP9101CK-AETRG1 equivalent, this device supports precise voltage- and current-based fault detection with integrated MOSFET gate control (CO/DO), high-voltage VM sensing up to 30V, and RoHS/Green compliance for portable energy storage systems.

Technical Context

The AP9101CK-AETRG1 implements independent analog comparators for VDD–VSS (cell voltage) and VM–VSS (current-sense voltage), each feeding into configurable delay timers (tCU, tDL, tDOC, tSHORT, tCOC) with ±20% accuracy at +25°C. Its logic circuit enforces auto-release overcharge protection and supports both power-down and auto-wake-up modes via factory configuration.

It uses internal high-voltage CMOS process enabling 30V differential rating between VDD and VM pins, with built-in pull-up (RVMD) and pull-down (RVMS) resistors for VM biasing during fault states. The CO and DO outputs drive external N-channel MOSFETs directly without external level shifters.

Key Specifications

Pinout & Package

SOT25 package (5-pin, 2.9mm × 1.6mm × 1.1mm), lead-free and RoHS/Green compliant. Pin 1 marked with dot; pin numbering follows standard top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery protection applications.

Compared with S-8261AAL-M6T1U and RP507K001B-TR-F, the AP9101CK-AETRG1 uniquely combines factory-programmed 0V charge enable, overvoltage charger detection (8.0V), and SOT25 footprint-making it optimal for consumer electronics requiring field-recoverable dead batteries and compact PCB layout.

Availability

AP9101CK-AETRG1 is available at Aetrix Electronics and suitable for power tool battery packs, wireless headphone charging cases, medical wearable sensors, and smart home smoke detectors requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CK-AETRG1 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 ICs, with design centers in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.

The AP9101C series belongs to Diodes' battery protection IC product line, engineered specifically for high-accuracy, low-power, single-chip solutions in 1-cell Li+ and Li-polymer battery packs targeting portable and safety-critical applications.

FAQ

What is the function of the VM pin on the AP9101CK-AETRG1?

The VM pin serves as the current-sense input, measuring voltage drop across an external sense resistor (R2) between battery P− and the IC's VM terminal. It enables detection of discharge overcurrent (0.300V threshold), short-circuit (0.550V), and charge overcurrent (−0.100V), with internal RVMS/RVMD resistors providing automatic biasing during fault states to ensure reliable MOSFET gate control.

Does the AP9101CK-AETRG1 support overvoltage protection for the charger input?

Yes-it includes a dedicated overvoltage charger detection circuit monitoring the VDD-to-VM differential. When this voltage exceeds 8.0V (±2V), the CO pin is driven low to disable the charge MOSFET immediately, with release occurring at 7.3V (±2V). No external components or delay timing are required for this function, and it operates independently of cell voltage monitoring.

How does the 0V battery charge function operate in the AP9101CK-AETRG1?

This factory-enabled feature allows the IC to initiate charging when the battery voltage is 0V due to self-discharge. It activates when a charger applies ≥1.2V to the VDD pin, enabling the DO output to turn on and permit current flow through the discharge path. Without this function, the IC would block charging until the cell voltage rises above ~2.0V, making recovery impossible for deeply depleted cells.

Can the AP9101CK-AETRG1 be used with 2-cell battery configurations?

No-it is strictly designed for 1-cell Li+ or Li-polymer applications with maximum VDD–VSS operating range of 1.5V to 5.5V. While the VM pin supports up to 30V differential (VDD–VM), this only accommodates high-side current sensing in single-cell topologies. For 2-cell stacks (up to 8.4V), a dedicated 2-cell protector such as the AP9211 or DW01-P must be used instead.