Diodes Incorporated AP9101CK-BITRG1

Overview

AP9101CK-BITRG1 from Diodes Incorporated is a single-chip lithium-ion/polymer battery protection IC for 1-cell packs, featuring ±25mV overcharge voltage detection accuracy at 4.375V, 0.15V discharge overcurrent threshold with ±15mV tolerance, and integrated fixed-delay timing eliminating external capacitors. It controls external N-channel MOSFETs via dedicated CO and DO gate drive pins to enforce overcharge, overdischarge, overcurrent, and short-circuit protection in portable power systems.

For engineers reviewing the AP9101CK-BITRG1 datasheet, AP9101CK-BITRG1 pinout, AP9101CK-BITRG1 application, or AP9101CK-BITRG1 equivalent, this device supports precise 1-cell Li+ pack safety compliance with selectable 0V charge function, power-down mode, and high-voltage (30V) VM–VDD capability - critical for compact battery management in wearables and IoT devices.

Technical Context

The AP9101CK-BITRG1 implements independent voltage and current monitoring paths: VDD–VSS senses cell voltage for overcharge/overdischarge, while VM–VSS measures sense resistor drop for discharge/charge overcurrent and short-circuit events. Its logic circuit applies configurable delay times (e.g., tCU = 1.0s typ, tSHORT = 8µs typ) before triggering CO/DO gate shutdown.

It integrates internal pull-up (RVMD) and pull-down (RVMS) resistors on the VM pin to enable automatic status recovery - RVMD connects during overdischarge to pull VM toward VDD; RVMS connects during overcurrent to pull VM toward VSS - enabling self-resetting behavior without external components.

Key Specifications

Pinout & Package

AP9101CK-BITRG1 is packaged in SOT25 (5-pin), with pin 1 marked and NC terminal omitted. The package supports reflow soldering and meets IPC/JEDEC J-STD-020 moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAB-M6T1U and RP502K001B-TR-F, the AP9101CK-BITRG1 uniquely combines factory-programmed precision thresholds, zero-external-timing architecture, and 0V charge enable - delivering certified safety compliance with minimal external components in ultra-compact 1S battery packs.

Availability

AP9101CK-BITRG1 is available at Aetrix Electronics and suitable for smart wearables, Bluetooth audio devices, medical sensors, and portable diagnostic tools requiring stable component supply and long-lifecycle support.

Supply support for AP9101CK-BITRG1 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 lines compliant with AEC-Q100/101 standards.

The AP9101C series targets high-reliability 1-cell Li+ battery protection, emphasizing precision voltage sensing, ultra-low power operation, and integration of safety-critical functions into a single SOT25 package.

FAQ

What is the function of the VM pin on the AP9101CK-BITRG1?

The VM pin serves as the current-sense input that monitors voltage drop across an external sense resistor (R2) between the battery's P− terminal and the load. It enables detection of discharge overcurrent, charge overcurrent, and short-circuit conditions. Internally, it connects to RVMD (pull-up to VDD) during overdischarge and RVMS (pull-down to VSS) during overcurrent, facilitating automatic status recovery without external circuitry.

Does AP9101CK-BITRG1 support both charge and discharge MOSFET control?

Yes - it provides independent gate drive outputs: CO pin controls the charge-path N-channel MOSFET, and DO pin controls the discharge-path N-channel MOSFET. Each output switches between high-impedance and active-low states, allowing bidirectional current blocking while maintaining low leakage in protected states. The IC does not integrate MOSFETs but is optimized for driving standard logic-level N-FETs.

How does the 0V battery charge function operate in AP9101CK-BITRG1?

This function is factory-enabled and allows the IC to permit charging when the battery voltage is 0V. Upon detecting a valid charger connection, the device wakes up and enables the CO pin to turn on the charge MOSFET even if VDD = 0V initially. It requires no external wake-up signal or manual intervention, making it ideal for consumer devices stored for extended periods without maintenance charging.

Can AP9101CK-BITRG1 be used in automotive applications?

No - the AP9101CK-BITRG1 is not qualified to AEC-Q100 and is specified for −40°C to +85°C operation, which aligns with industrial but not automotive temperature or reliability requirements. Diodes Incorporated offers AEC-Q101-qualified alternatives (e.g., AP9211 series) for under-hood or infotainment battery protection; this part is intended for consumer and portable medical applications.