Diodes Incorporated AP9101CAK-BDTRG1

Overview

AP9101CAK-BDTRG1 from Diodes Incorporated is a single-chip lithium-ion battery protection IC for 1-cell packs, featuring overcharge detection at 4.375V ±25mV, overdischarge detection at 2.500V ±35mV, discharge overcurrent detection at 0.150V ±15mV, and built-in fixed delay timing with no external capacitor required. It controls external N-channel MOSFETs via dedicated CO and DO gate drive pins and supports 0V battery charge functionality.

For engineers reviewing the AP9101CAK-BDTRG1 datasheet, AP9101CAK-BDTRG1 pinout, AP9101CAK-BDTRG1 application, or AP9101CAK-BDTRG1 equivalent, this device is selected for precision cell voltage monitoring, low-quiescent-current battery safety systems, and compact 1S pack designs requiring integrated overvoltage charger detection (8.0V) and selectable power-down mode.

Technical Context

The AP9101CAK-BDTRG1 implements independent analog comparators for VDD–VSS (cell voltage), VM–VSS (current-sense), and VDD–VM (charger overvoltage), each with dedicated hysteresis and programmable thresholds. Its logic circuit enforces auto-release overcharge protection and supports both power-down and auto-wake-up operation modes via factory configuration.

It uses high-voltage CMOS process technology enabling 30V tolerance between VDD and VM pins, integrates internal pull-up/pull-down resistors (RVMD = 150–500 kΩ, RVMS = 10–50 kΩ), and delivers gate drive capability with CO/DO output resistance of 2–10 kΩ in both high- and low-states across operating temperature.

Key Specifications

Pinout & Package

AP9101CAK-BDTRG1 is packaged in SOT25 (5-pin) with lead-free, RoHS-compliant construction. Pin 1 is marked and corresponds to VM; pin 2 is VDD; pin 3 is VSS; pin 4 is DO; pin 5 is CO. NC terminal is absent in SOT25 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5460N258AA-TR and BD86300GUL-E2, AP9101CAK-BDTRG1 uniquely combines factory-programmed precision thresholds, 8.0V charger overvoltage blocking, and 0V battery recovery-all in a 5-pin SOT25 package with 0.01µA sleep current, making it optimal for field-serviceable, safety-certified 1S Li-ion systems.

Availability

AP9101CAK-BDTRG1 is available at Aetrix Electronics and suitable for smart wearables, medical IoT sensors, portable diagnostic tools, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CAK-BDTRG1 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 solutions, with design, manufacturing, and distribution operations across Asia, Europe, and the Americas.

The AP9101C belongs to Diodes' battery protection IC product line, engineered specifically for high-accuracy, low-power, single-cell lithium-ion/polymer pack safety-emphasizing precision voltage detection, integrated delay timing, and robust fault response without external passive components.

FAQ

What is the function of the VM pin on AP9101CAK-BDTRG1?

The VM pin serves as the current-sense input that monitors voltage drop across an external sense resistor between the battery's P− terminal and ground. It enables detection of discharge overcurrent, charge overcurrent, and short-circuit conditions by comparing VM–VSS against internal thresholds (e.g., 0.150V ±15mV for discharge overcurrent). Internal resistors RVMD and RVMS connect dynamically during fault states to ensure accurate sensing and automatic recovery.

Does AP9101CAK-BDTRG1 support automatic recovery from overdischarge?

Yes-AP9101CAK-BDTRG1 supports auto-release overdischarge protection. When battery voltage rises above the overdischarge release voltage (2.900V ±100mV), and VM–VSS falls below the discharge overcurrent threshold, the DO pin returns high to re-enable the discharge FET. This occurs without external intervention, provided the 0V charge function is enabled and no persistent short exists on the load side.

How does the 8.0V overvoltage charger detection work?

The AP9101CAK-BDTRG1 continuously monitors voltage between VDD and VM pins. If this differential exceeds 8.0V ±2V, the CO pin immediately drives low to disable the charge FET-no delay timer applies. Recovery occurs when the VDD–VM voltage drops below 7.3V ±2V, at which point CO returns high. This function operates independently of cell voltage monitoring and requires no external components.

Can AP9101CAK-BDTRG1 be used with 2S battery configurations?

No-AP9101CAK-BDTRG1 is designed exclusively for 1-cell Li-ion/polymer batteries. Its voltage detection ranges (e.g., 2.500V–4.375V) and internal references are calibrated for single-cell operation. For 2S packs, Diodes offers the AP9211 series, which supports dual-cell monitoring with separate VDD/VSS and VC1/VC2 inputs and coordinated protection logic.