Diodes Incorporated AP9101CAK-BUTRG1

Overview

AP9101CAK-BUTRG1 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 integrated fixed-delay timing with no external capacitor required. It controls external N-channel MOSFETs via dedicated CO and DO gate drive pins in portable power tools, Bluetooth headsets, and wearable medical monitors.

For engineers reviewing the AP9101CAK-BUTRG1 datasheet, AP9101CAK-BUTRG1 pinout, AP9101CAK-BUTRG1 application, or AP9101CAK-BUTRG1 equivalent, this device delivers factory-configured voltage thresholds, selectable power-down mode, 0V battery charge enable, and high-accuracy current-sense-based protection without external timing components-critical for compact, low-quiescent-power Li+ pack designs.

Technical Context

The AP9101CAK-BUTRG1 implements independent analog comparators for VDD–VSS (cell voltage) and VM–VSS (current-sense voltage), each feeding into precision delay timers (tCU, tDL, tDOC, tSHORT, tCOC) with ±20% accuracy at +25°C. Its logic circuitry enforces auto-release overcharge protection and supports both power-down and auto-wake-up operation modes via factory-set configuration.

It uses high-voltage CMOS process technology enabling 30V differential rating between VDD and VM pins, while internal RVMD/RVMS resistors (300kΩ/30kΩ typ) provide controlled pull-up/pull-down during fault states to ensure reliable MOSFET gate control under overdischarge, short-circuit, and overcurrent conditions.

Key Specifications

Pinout & Package

AP9101CAK-BUTRG1 is packaged in SOT25 (5-pin) with lead-free, RoHS-compliant construction. Pin 1 marked; pinout validated per Diodes DS37771 Rev. 8-3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP9101CAK-BUTRG1, the AATRG1 variant offers identical protection behavior but with a different VDU setting, whereas ABTRG1 raises overcharge thresholds for enhanced safety margin-both retain the same 0V charge enable and power-down mode, making them drop-in replacements only when voltage thresholds align with system requirements.

Availability

AP9101CAK-BUTRG1 is available at Aetrix Electronics and suitable for portable power tools, wireless audio accessories, wearable medical monitors, and smart stylus designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/Green compliance.

Supply support for AP9101CAK-BUTRG1 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP9101C series belongs to Diodes' battery protection IC product line, engineered specifically for cost-sensitive, space-constrained 1-cell Li+ applications where precision voltage monitoring, ultra-low quiescent current, and integrated timing are essential.

FAQ

What is the function of the VM pin on AP9101CAK-BUTRG1?

The VM pin serves as the current-sense input terminal, measuring voltage drop across an external sense resistor to detect discharge overcurrent, charge overcurrent, and short-circuit conditions. It connects to the source of the discharge MOSFET and enables the IC to distinguish between normal load current and fault-level current without additional amplification circuitry.

Does AP9101CAK-BUTRG1 require external timing capacitors?

No. The AP9101CAK-BUTRG1 integrates fixed-time delay circuits for all protection functions-including overcharge, overdischarge, and overcurrent detection-eliminating the need for external timing capacitors. This reduces bill-of-materials count, improves reliability, and saves PCB space in compact battery pack layouts.

How does the 0V battery charge function operate?

The 0V battery charge function is factory-enabled in AP9101CAK-BUTRG1 and allows the IC to permit charging when the battery voltage is 0V due to self-discharge. It activates when a charger applies ≥1.2V to the VDD pin, enabling the CO output to turn on the charge MOSFET even with zero initial cell voltage-no external pre-charge circuit is required.

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

Power-down mode (enabled in AP9101CAK-BUTRG1) reduces current consumption to 0.01µA by entering overdischarge state and disabling internal circuitry; recovery requires charger connection. Auto-wake-up mode remains active during overdischarge and resumes normal operation when battery voltage rises above VDU-this part uses power-down mode, not auto-wake-up.