Diodes Incorporated AP9101CAK-BTTRG1

Overview

AP9101CAK-BTTRG1 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 DO (discharge gate) and CO (charge gate) pins in portable power tools, Bluetooth headsets, and wearable medical monitors.

For engineers reviewing the AP9101CAK-BTTRG1 datasheet, AP9101CAK-BTTRG1 pinout, AP9101CAK-BTTRG1 application, or AP9101CAK-BTTRG1 equivalent, this device supports selectable power-down mode, 0V battery charge function, and high-accuracy voltage monitoring across -40°C to +85°C - critical for reliable BMS design in space-constrained consumer and industrial Li+ applications.

Technical Context

The AP9101CAK-BTTRG1 integrates precision analog comparators, logic control circuitry, and level-shifted gate drivers to independently manage charge and discharge paths. Its VM pin senses current-sense voltage between P− and battery negative, while VDD–VSS monitors cell voltage directly.

It implements auto-release overcharge protection with fixed 4.175V release threshold and configurable overdischarge hysteresis (0.400V), enabling stable recovery without manual reset. The IC operates within 1.5–5.5V supply range and withstands up to 30V differential between VDD and VM pins using high-voltage CMOS process technology.

Key Specifications

Pinout & Package

AP9101CAK-BTTRG1 is packaged in SOT25 (5-pin) - a surface-mount, lead-free, RoHS-compliant package measuring 2.9mm × 1.6mm × 1.1mm with standard JEDEC moisture sensitivity level 1 handling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAB-M6T1U and RP507K001B-TR-F, AP9101CAK-BTTRG1 uniquely combines 0V charge support, overvoltage charger detection, and capacitor-free timing in a 5-pin SOT25 - delivering system-level safety and BOM reduction unattainable with either alternative.

Availability

AP9101CAK-BTTRG1 is available at Aetrix Electronics and suitable for portable power tools, wireless audio accessories, wearable medical monitors, and smart locks requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for AP9101CAK-BTTRG1 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 manufacturing certified to IATF 16949 and product compliance to AEC-Q200, RoHS, and halogen-free standards.

The AP9101C series belongs to Diodes' battery management IC portfolio, engineered specifically for cost-sensitive, space-constrained 1-cell Li+ applications demanding high accuracy, ultra-low power, and integrated fault protection without external timing components.

FAQ

What is the function of the VM pin on AP9101CAK-BTTRG1?

The VM pin serves as the current-sense input terminal, measuring voltage difference between the battery's P− node and VSS to detect discharge overcurrent, charge overcurrent, and short-circuit conditions. It operates over a -0.3V to 5.5V range and interfaces directly with the external sense resistor without signal conditioning.

Does AP9101CAK-BTTRG1 support automatic recovery from overdischarge without a charger?

Yes - AP9101CAK-BTTRG1 includes factory-configured auto-wake-up functionality. When the battery voltage rises above the overdischarge release voltage (2.900V) and remains there for the tDLR delay, the IC exits overdischarge status and re-enables the DO pin, even without external charger connection.

How does the overvoltage charger detection feature work?

This function monitors the voltage between VDD and VM pins. If it exceeds 8.0V (±2V), the CO pin is driven low immediately to disable the charge MOSFET. Recovery occurs when the voltage drops below 7.3V (±2V), with no intentional delay - providing instantaneous response to faulty or mismatched chargers.

Can AP9101CAK-BTTRG1 be used with lithium iron phosphate (LiFePO₄) cells?

No - AP9101CAK-BTTRG1 is calibrated for lithium-ion/lithium-polymer chemistry with nominal 3.7V and 4.2V–4.375V full-charge thresholds. Its 2.500V overdischarge detection and 4.375V overcharge detection are incompatible with LiFePO₄'s 2.5V–3.65V operating range and would cause premature cutoff or unsafe charging.