Diodes Incorporated AP9101CK-BGTRG1

Overview

AP9101CK-BGTRG1 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, and discharge overcurrent detection at 0.150V ±15mV. It integrates fixed-delay timing circuits, supports selectable 0V battery charging and power-down mode, and drives external N-channel MOSFETs via dedicated CO and DO pins in portable power tools and Bluetooth headsets.

For engineers reviewing the AP9101CK-BGTRG1 datasheet, AP9101CK-BGTRG1 pinout, AP9101CK-BGTRG1 application, or AP9101CK-BGTRG1 equivalent, this page delivers verified voltage thresholds, real-world delay timing accuracy (±20%), CO/DO gate drive capability, SOT25 package constraints, and functional alternatives with documented release voltage and overcurrent detection differences.

Technical Context

The AP9101CK-BGTRG1 implements independent analog comparators for VDD–VSS (cell voltage) and VM–VSS (current-sense voltage), each feeding into logic-controlled delay timers with ±20% accuracy at +25°C. Its internal high-voltage CMOS process supports up to 30V between VDD and VM, enabling direct connection to charger inputs without level-shifting.

Protection states are latched and released based on precise voltage hysteresis: overcharge releases at 4.175V (200mV hysteresis), overdischarge at 2.900V (400mV hysteresis), and short-circuit detection triggers within 0.6–1.4 µs. The device operates across –40°C to +85°C with 3.0µA typical operating current and 0.01µA power-down current when VM is floating.

Key Specifications

Pinout & Package

AP9101CK-BGTRG1 is housed in a RoHS-compliant SOT25 (SC-74A) surface-mount package with 5 terminals and exposed pad for thermal dissipation. Pin 1 is marked with a dot; the NC pin (Pin 4 in SOT26 variant) is omitted in this SOT25 configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5460N438AA-TR-FE, AP9101CK-BGTRG1 adds overvoltage charger detection and factory-configured 0V charge, while versus BD14000FVJ-E2 it retains external FET control for optimized thermal management and higher current scalability.

Availability

AP9101CK-BGTRG1 is available at Aetrix Electronics and suitable for power tool battery packs, wireless headset batteries, medical portable monitors, and smart wearable sensors requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CK-BGTRG1 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 devices, with design centers across Asia, Europe, and the U.S., and ISO/TS 16949-certified manufacturing facilities.

The AP9101C product line delivers highly integrated, low-quiescent-current battery protection ICs targeting compact, high-reliability 1-cell Li+ applications in consumer, industrial, and medical markets - emphasizing precision voltage detection, minimal external components, and robust fault coverage.

FAQ

What is the function of the VM pin on AP9101CK-BGTRG1?

The VM pin serves as the current-sense input referenced to VSS, detecting voltage drops across an external sense resistor to identify discharge overcurrent, charge overcurrent, and short-circuit conditions. It supports bidirectional sensing from –0.3V to +5.5V and features internal resistors (RVMS/RVMD) that activate selectively during protection states to pull VM toward VSS or VDD for status feedback and auto-release behavior.

Does AP9101CK-BGTRG1 support overvoltage protection for the charger input?

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

How does the 0V battery charge function operate in AP9101CK-BGTRG1?

This function is factory-enabled in the "K" variant 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. Without it, the IC would block charging until the cell reaches ~2.5V, making recovery impossible after deep self-discharge.

What is the difference between power-down mode and auto-wake-up mode in AP9101CK-BGTRG1?

Power-down mode reduces current consumption to 0.01µA by entering a latched overdischarge state; recovery requires external charger connection. Auto-wake-up mode (not present in this "K" variant) maintains active monitoring in overdischarge and releases automatically when battery voltage rises above VDU (2.900V), enabling zero-touch reactivation without charger dependency.