Diodes Incorporated AP9101CAK-BPTRG1

Overview

AP9101CAK-BPTRG1 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) to protect against voltage, current, and short-circuit faults in portable power tools and Bluetooth headsets.

For engineers reviewing the AP9101CAK-BPTRG1 datasheet, AP9101CAK-BPTRG1 pinout, AP9101CAK-BPTRG1 application, or AP9101CAK-BPTRG1 equivalent, this device delivers precision cell monitoring with selectable 0V charge and power-down mode, high-voltage tolerance (30V VDD–VM), and RoHS/Green compliance - critical for compact, safety-certified Li+ pack designs.

Technical Context

The AP9101CAK-BPTRG1 integrates independent voltage comparators for overcharge (VCU = 4.375V), overdischarge (VDL = 2.500V), and overvoltage charger (VOVCHG = 8.0V), each with programmable hysteresis and ±25–±100mV accuracy. Its logic circuit drives CO and DO outputs directly to control external N-MOSFETs without level-shifting components.

It features dual sensing paths: VDD–VSS monitors cell voltage, while VM–VSS senses current via sense resistor R2 (2.7kΩ typical); internal RVMD/RVMS resistors enable automatic status recovery during overdischarge or short-circuit events. The device operates across –40°C to +85°C with 3.0µA typical operating current.

Key Specifications

Pinout & Package

SOT25 package: 5-pin, small-outline transistor with gull-wing leads; moisture sensitivity level MSL3; RoHS-compliant lead finish.

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 AP9101CAK-BPTRG1 uniquely combines factory-programmed precision thresholds, 0V charge capability, and capacitor-free timing - delivering lower system-level cost and faster time-to-market for new 1S Li+ products.

Availability

AP9101CAK-BPTRG1 is available at Aetrix Electronics and suitable for power tool battery packs, wireless headset batteries, and medical portable monitors requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.

Supply support for AP9101CAK-BPTRG1 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 devices, with manufacturing certified to IATF 16949 and product qualification per AEC standards.

The AP9101C belongs to Diodes' battery protection IC product line, engineered specifically for high-accuracy, low-quiescent-current safety monitoring in space-constrained 1-cell Li+ applications.

FAQ

What is the function of the VM pin on the AP9101CAK-BPTRG1?

The VM pin serves as the current-sense input referenced to VSS, measuring voltage drop across an external sense resistor (R2) to detect discharge overcurrent, charge overcurrent, and short-circuit conditions. Internal resistors RVMD and RVMS connect automatically during fault states to enable self-recovery without host intervention.

Does the AP9101CAK-BPTRG1 require external timing capacitors?

No. The AP9101CAK-BPTRG1 integrates fixed detection delay timers for overcharge (tCU), overdischarge (tDL), and overcurrent events, eliminating the need for external timing capacitors. This reduces bill-of-materials count, PCB area, and calibration variability across temperature and voltage ranges.

How does the 0V battery charge function operate?

When enabled (factory-set in AP9101CAK-BPTRG1), the 0V battery charge function allows the IC to exit power-down mode and enable charging even when the battery voltage reads 0V due to self-discharge. It does so by detecting charger presence at VDD and asserting CO high once V0CHA threshold (1.2V) is met, bypassing normal under-voltage lockout.

What is the maximum allowable voltage between VDD and VM pins?

The absolute maximum voltage between VDD and VM pins is 30V, as specified in the Absolute Maximum Ratings table. This high tolerance enables robust operation with fast-charging adapters and protects against voltage transients during hot-plug events without requiring external clamping diodes or Zener regulators.