Diodes Incorporated AP9101CK-BFTRG1

Overview

AP9101CK-BFTRG1 from Diodes Incorporated is a single-chip lithium-ion/polymer battery protection IC for 1-cell packs, featuring overcharge detection at 4.425 V ±25 mV, overdischarge detection at 2.500 V ±35 mV, discharge overcurrent detection at 0.150 V ±15 mV, 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 AP9101CK-BFTRG1 datasheet, AP9101CK-BFTRG1 pinout, AP9101CK-BFTRG1 application, or AP9101CK-BFTRG1 equivalent, this device is selected for high-accuracy, low-quiescent-current battery safety in portable power tools, Bluetooth headsets, and medical wearables where precise voltage thresholds, sub-1 µA power-down current, and SOT25 footprint are critical.

Technical Context

The AP9101CK-BFTRG1 implements independent analog comparators for overcharge (VCU = 4.425 V), overdischarge (VDL = 2.500 V), discharge overcurrent (VDOC = 0.150 V), and short-circuit (VSHORT = 0.700 V), each with configurable hysteresis and ±20% delay time accuracy. Its logic circuit directly drives CO and DO outputs to control external charge/discharge FETs without external level-shifting components.

It integrates internal VM–VSS and VM–VDD sense resistors (RVMS = 10–30 kΩ, RVMD = 150–300 kΩ) to enable current monitoring and status recovery functions, and includes an overvoltage charger detection circuit (VOVCHG = 8.0 V) that responds instantly-no delay-to protect against faulty chargers.

Key Specifications

Pinout & Package

AP9101CK-BFTRG1 is packaged in SOT25 (5-pin) with exposed pad for thermal performance and board-level reliability. Pin 1 is marked and corresponds to VM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP9101CK-AFTRG1 and AP9101CK-AHTRG1, the AP9101CK-BFTRG1 offers the most balanced combination of mid-range overcharge voltage (4.425 V), conservative overdischarge (2.500 V), and moderate discharge overcurrent sensitivity (0.150 V), making it ideal for general-purpose 1-cell Li+ applications where robustness and compatibility outweigh extreme parameter tuning.

Availability

AP9101CK-BFTRG1 is available at Aetrix Electronics and suitable for power tool battery packs, wireless headset batteries, and portable medical monitors requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CK-BFTRG1 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 series is part of Diodes' battery protection IC product line, engineered specifically for high-accuracy, low-power, single-cell Li+ safety in space-constrained portable electronics.

FAQ

What is the function of the VM pin on the AP9101CK-BFTRG1?

The VM pin serves as the current-sense input terminal, measuring the voltage difference between itself and VSS to detect discharge overcurrent, short-circuit, and charge overcurrent conditions. Internally, it connects to precision resistors (RVMS and RVMD) that enable automatic wake-up from overdischarge and short-circuit recovery without external components. It must be connected to the source node of the discharge FET's sense resistor.

Does AP9101CK-BFTRG1 support 0V battery charging, and how is it activated?

Yes, AP9101CK-BFTRG1 includes factory-configured 0V battery charge functionality. When the battery voltage is 0 V, the IC permits charging to begin once the charger applies ≥1.2 V to VDD, allowing recovery of deeply self-discharged cells. This feature is permanently enabled in the BF variant and requires no external configuration or firmware control.

How does the power-down mode operate, and what triggers exit from it?

Power-down mode reduces current consumption to 0.01 µA by disabling internal comparators and logic. Exit occurs only upon connection of a functional charger: the resulting voltage rise at VDD and VM pulls the device out of sleep and restores full protection functionality. No auto-wake-up occurs without charger presence, distinguishing it from the "A"-suffix auto-wake versions.

Can AP9101CK-BFTRG1 be used with both N-channel and P-channel FETs in the protection circuit?

AP9101CK-BFTRG1 is designed exclusively for N-channel MOSFETs in both charge and discharge paths. Its CO and DO outputs drive gates high to turn on FETs and pull low to disable them. Driving P-channel FETs would require inverted logic and level-shifting circuitry not supported by the IC's output architecture or voltage ratings.