Diodes Incorporated AP9101CK-AXTRG1

Overview

AP9101CK-AXTRG1 from Diodes Incorporated is a single-chip lithium-ion battery protection IC for 1-cell packs, featuring overcharge detection at 4.280V ±25mV, overdischarge detection at 2.800V ±35mV, discharge overcurrent detection at 0.100V ±15mV, and integrated 0V battery charge enablement. It controls external N-channel MOSFETs via dedicated CO and DO pins and operates with 3.0µA typical current consumption in active mode.

For engineers reviewing the AP9101CK-AXTRG1 datasheet, AP9101CK-AXTRG1 pinout, AP9101CK-AXTRG1 application, or AP9101CK-AXTRG1 equivalent, this device supports precise voltage- and current-based fault detection for portable Li+ power systems requiring low quiescent current, fixed-delay protection timing, and SOT25-packaged integration with no external timing capacitors.

Technical Context

The AP9101CK-AXTRG1 implements independent analog comparators for VDD–VSS (cell voltage), VM–VSS (current-sense voltage), and VDD–VM (charger overvoltage), each feeding into logic-controlled delay timers and FET gate drivers. Its internal high-voltage CMOS process supports up to 30V between VDD and VM pins, enabling direct monitoring of charger input without level-shifting circuitry.

Protection states are latched and released automatically: overcharge releases at 4.080V, overdischarge releases at 2.800V, and short-circuit detection triggers within 0.6–1.4µs. The device supports selectable power-down mode (0.01µA typ) and factory-configured 0V battery charging functionality, both confirmed in the ordering code "AXTRG1".

Key Specifications

Pinout & Package

AP9101CK-AXTRG1 is housed in a RoHS-compliant, lead-free SOT25 package (3.0mm × 1.7mm × 1.3mm), optimized for space-constrained battery pack PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP9101CK-AXTRG1, the AETRG1 variant prioritizes system-level voltage stability over maximum runtime, while AKTRG1 trades early overdischarge intervention for extended discharge depth-making AXTRG1 optimal for balanced runtime, safety, and compatibility with modern 2.8V–4.2V Li+ cells.

Availability

AP9101CK-AXTRG1 is available at Aetrix Electronics and suitable for smart wearables, Bluetooth headsets, portable medical sensors, and IoT asset trackers requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CK-AXTRG1 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 consumer, industrial, and automotive markets.

The AP9101C product line delivers single-chip battery protection for 1-cell Li+ systems, designed specifically to reduce external component count, eliminate timing capacitors, and support factory-programmed voltage thresholds and functional options like 0V charge and power-down mode.

FAQ

What is the function of the VM pin on AP9101CK-AXTRG1?

The VM pin serves as the current-sense input terminal, measuring voltage drop across an external sense resistor to detect discharge overcurrent, charge overcurrent, and short-circuit conditions. It operates referenced to VSS and supports up to 30V differential with VDD, enabling direct monitoring of high-side or low-side sensing configurations without level shifters.

Does AP9101CK-AXTRG1 support automatic recovery from overdischarge?

Yes - AP9101CK-AXTRG1 releases from overdischarge status when battery voltage rises to the overdischarge release voltage of 2.800V, provided the VM pin voltage remains below typical –0.7V relative to VSS. This behavior is confirmed in the "Auto Release Option 1" configuration indicated by the "AX" suffix in the part number.

Can AP9101CK-AXTRG1 be used with 2-cell battery packs?

No - AP9101CK-AXTRG1 is explicitly designed for 1-cell Li+ or Li-polymer batteries, with absolute maximum VDD–VSS rating of 12V and operating supply range of 1.5V–5.5V. For 2-cell applications, Diodes' AP9211 or AP9221 series provide appropriate voltage scaling and dual-cell balancing interfaces.

How does the 0V battery charge function operate in AP9101CK-AXTRG1?

The 0V battery charge function is factory-enabled in AP9101CK-AXTRG1 and permits charging of fully depleted cells (0V) by allowing the charger to raise the battery voltage above 1.2V before normal protection logic activates. This eliminates the need for external wake-up circuitry or manual reset procedures in end-user devices.