Diodes Incorporated AP9101CAK-AXTRG1

Overview

AP9101CAK-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, short-circuit detection at 0.500V ±100mV, and charge overcurrent detection at −0.100V ±15mV. It integrates fixed-delay timing, 0V battery charge enable, and selectable power-down mode in SOT26 package.

For engineers reviewing the AP9101CAK-AXTRG1 datasheet, AP9101CAK-AXTRG1 pinout, AP9101CAK-AXTRG1 application, or AP9101CAK-AXTRG1 equivalent, this device supports precise voltage- and current-based fault detection with built-in hysteresis, CMOS-level gate drive for external N-channel MOSFETs, and operation across −40°C to +85°C ambient temperature.

Technical Context

The AP9101CAK-AXTRG1 implements independent analog comparators for six protection conditions-overcharge, overdischarge, discharge/charge overcurrent, short circuit, and overvoltage charger-with dedicated delay timers (tCU, tDL, tDOC, tSHORT, tCOC) each accurate to ±20% at +25°C. Its logic circuitry uses high-voltage CMOS process enabling 30V VDD-to-VM tolerance.

It features dual-mode operation: selectable power-down mode (0.1µA standby) or auto-wake-up mode (5.5µA standby), with 0V battery charge function enabled. The VM pin senses current-sense voltage across R2, while DO and CO pins directly drive external N-MOSFET gates without external level shifters.

Key Specifications

Pinout & Package

AP9101CAK-AXTRG1 is housed in a RoHS-compliant, halogen-free SOT26 package (3.0mm × 1.7mm × 1.3mm), optimized for compact 1-cell battery pack PCB layouts with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAL-M6T1U and RP502K001B-TR-F, AP9101CAK-AXTRG1 delivers tighter voltage accuracy (±25mV vs ±50mV), integrated timing, 0V charge support, and 30V VDD–VM robustness - making it optimal for space-constrained, high-reliability 1-cell Li+ designs requiring zero-volt recoverability and charger fault immunity.

Availability

AP9101CAK-AXTRG1 is available at Aetrix Electronics and suitable for power tool battery packs, medical portable monitor batteries, wireless headphone modules, and smart wearable tracker cells requiring stable component supply with full traceability and lifecycle management.

Supply support for AP9101CAK-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 protection, power management, and signal integrity solutions for industrial, computing, and consumer markets.

The AP9101C series belongs to Diodes' battery protection IC product line, engineered specifically for compact, high-precision 1-cell Li+/Li-polymer battery pack safety - emphasizing low quiescent current, factory-programmable thresholds, and robust fault response.

FAQ

What is the function of the NC pin on AP9101CAK-AXTRG1?

Pin 4 is internally not connected and must remain unattached in the PCB layout. It is not tied to any internal node and serves no electrical purpose. Leaving it floating or connecting it to VSS is acceptable, but routing signals or decoupling components to this pin provides no benefit and may risk unintended coupling in high-noise environments.

Does AP9101CAK-AXTRG1 support bidirectional current sensing?

No - the AP9101CAK-AXTRG1 senses current unidirectionally via the VM pin referenced to VSS. It detects discharge overcurrent and short circuits when VM ≥ VDOC or VSHORT, and charge overcurrent when VM ≤ VCOC. It does not measure direction or magnitude of current; it only triggers protection based on signed voltage thresholds relative to VSS.

How does the 0V battery charge function operate in AP9101CAK-AXTRG1?

When enabled (as in this variant), the IC permits charging of a fully depleted cell (0V) by allowing the charger to raise the VDD voltage above 1.2V, which activates internal circuitry and enables CO output. This bypasses the normal under-voltage lockout, eliminating need for external pre-charge circuits - critical for consumer devices shipped with dead batteries.

Can AP9101CAK-AXTRG1 be used in 2-cell battery configurations?

No - AP9101CAK-AXTRG1 is strictly designed for single-cell Li+ (2.8V–4.28V) applications. Its absolute maximum VDD–VSS rating is 12V, but its protection thresholds (e.g., 4.280V overcharge) and internal reference architecture are calibrated for 1-cell operation. Using it in 2-cell stacks would result in undervoltage false trips and unsafe overvoltage exposure.