Diodes Incorporated AP9101CAK-AATRG1

Overview

AP9101CAK-AATRG1 from Diodes Incorporated is a single-chip lithium-ion battery protection IC for 1-cell packs, integrating overcharge (4.375V), overdischarge (2.500V), discharge overcurrent (0.150V), short-circuit (0.700V), and charge overcurrent (-0.150V) detection with ±25mV voltage accuracy and fixed internal delay timing. It drives external N-channel MOSFETs via dedicated CO and DO pins and supports 0V battery charging and selectable power-down mode.

For engineers reviewing the AP9101CAK-AATRG1 datasheet, AP9101CAK-AATRG1 pinout, AP9101CAK-AATRG1 application, or AP9101CAK-AATRG1 equivalent, this device is selected for compact, low-power, high-accuracy battery pack safety in portable medical devices, power tools, and Bluetooth headsets where precise voltage thresholds and ultra-low quiescent current (3.0µA operation / 0.01µA power-down) are critical.

Technical Context

The AP9101CAK-AATRG1 implements independent analog comparators for VDD–VSS (cell voltage) and VM–VSS (current-sense voltage), each feeding into logic-controlled delay timers and FET gate drivers. Its CO and DO outputs drive external N-MOSFETs in series with the charge and discharge paths, enabling bidirectional current control without external timing capacitors.

It features a high-voltage CMOS process supporting up to 30V between VDD and VM pins, enabling robust operation during charger fault conditions. The device includes factory-configurable options: auto-release overcharge protection, selectable power-down mode, and enabled 0V battery charge function - all fixed per part number and not user-programmable.

Key Specifications

Pinout & Package

AP9101CAK-AATRG1 is packaged in SOT25 (5-pin) - a standard surface-mount package with 0.95mm pitch, suitable for automated assembly and space-constrained battery management modules.

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-AATRG1 delivers factory-trimmed precision (±25mV), integrated 0V charge, and 30V fault tolerance - reducing validation effort and enabling safer, more compact 1-cell Li+ systems without external programming components.

Availability

AP9101CAK-AATRG1 is available at Aetrix Electronics and suitable for portable medical monitors, power tool battery packs, and Bluetooth headsets requiring stable component supply, long-lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CAK-AATRG1 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 AP9101C belongs to Diodes' battery protection IC product line, engineered specifically for high-accuracy, low-quiescent-current safety monitoring in single-cell lithium-ion and lithium-polymer battery packs used in portable electronics.

FAQ

What is the function of the VM pin on AP9101CAK-AATRG1?

The VM pin serves as the current-sense input that measures voltage drop across an external sense resistor between the battery's P− terminal and load/charger. It directly feeds the discharge overcurrent, short-circuit, and charge overcurrent comparators, enabling real-time current monitoring without additional amplifiers or ADCs.

Does AP9101CAK-AATRG1 support both charge and discharge path control?

Yes - it provides independent gate drive outputs: CO controls the charge-path N-MOSFET, and DO controls the discharge-path N-MOSFET. Each output can be asserted low independently, allowing asymmetric protection (e.g., block charge during overvoltage while permitting discharge).

How does the 0V battery charge function operate in AP9101CAK-AATRG1?

This function is factory-enabled and allows the IC to exit power-down or overdischarge lockout when a charger applies voltage to the battery terminals, even if the cell voltage reads 0V. It bypasses the normal under-voltage lockout, permitting safe pre-charge initiation without external circuitry.

What is the significance of the "AATRG1" suffix in AP9101CAK-AATRG1?

The suffix encodes configuration: "AA" = overcharge detection 4.375V / release 4.175V, "T" = SOT25 package, "R" = tape-and-reel packaging, "G1" = RoHS/Green compliance. The "K" in position 7 indicates SOT25; "A" in position 9 denotes selectable power-down mode.