Diodes Incorporated AP9101CAK-AGTRG1

Overview

AP9101CAK-AGTRG1 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 0.075V ±15mV, and integrated fixed-time delay circuitry eliminating external capacitors. It controls external N-channel MOSFETs via dedicated CO and DO pins in portable power tools, Bluetooth headsets, and medical wearables.

For engineers reviewing the AP9101CAK-AGTRG1 datasheet, AP9101CAK-AGTRG1 pinout, AP9101CAK-AGTRG1 application, or AP9101CAK-AGTRG1 equivalent, this device delivers precision voltage monitoring, selectable 0V charge function, auto-release overcharge protection mode, and ultra-low 3.0µA operating current - critical for long-life battery-powered systems requiring reliable cell-level safety compliance.

Technical Context

The AP9101CAK-AGTRG1 implements independent analog comparators with built-in hysteresis for overcharge (4.175V release), overdischarge (2.900V release), and short-circuit (0.700V threshold) conditions, each paired with fixed-delay timers (±20% accuracy). Its VM pin monitors voltage drop across a sense resistor to detect charge/discharge current direction and magnitude.

Logic circuitry drives CO and DO outputs to high-impedance or active-low states based on real-time voltage and current thresholds, while internal level shifters enable operation up to 30V between VDD and VM. The device supports both power-down mode (0.01µA standby) and auto-wake-up variants, with factory-configured settings per ordering code.

Key Specifications

Pinout & Package

SOT25 package: 5-pin, small-outline transistor outline with gull-wing leads, 1.6mm × 2.9mm footprint, 1.1mm height, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAL-M6T1U and RP502K001B-TR-F, the AP9101CAK-AGTRG1 provides tighter voltage accuracy (±25mV vs. ±50mV), eliminates external timing components, and integrates 30V VM–VDD monitoring - enabling safer, more compact designs for high-reliability portable electronics.

Availability

AP9101CAK-AGTRG1 is available at Aetrix Electronics and suitable for power tools, wireless headsets, medical wearables, and smart pens requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CAK-AGTRG1 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 industrial and consumer markets.

The AP9101C belongs to Diodes' battery protection IC product line, engineered specifically for space-constrained, single-cell Li+ applications demanding precision voltage thresholds, ultra-low quiescent current, and integrated fault response without external timing components.

FAQ

What is the function of the VM pin on the AP9101CAK-AGTRG1?

The VM pin serves as the current-sense input that measures voltage drop across an external sense resistor between the battery pack's P– terminal and the load. It enables detection of charge/discharge direction and magnitude - triggering CO or DO shutdown when thresholds like 0.075V (discharge overcurrent) or –0.075V (charge overcurrent) are exceeded. Internal resistors RVMD and RVMS connect dynamically during fault states to pull VM toward VDD or VSS for status stabilization.

Does the AP9101CAK-AGTRG1 support automatic recovery from overdischarge without a charger?

Yes - the "A" in the part number denotes auto-wake-up functionality. When configured as AP9101CAK-AGTRG1, the device exits overdischarge state if the battery voltage rises to ≥2.900V (VDU) and remains there for the overdischarge release delay time, even without charger connection. This differs from power-down mode variants that require charger presence to resume normal operation.

How does the AP9101CAK-AGTRG1 handle overvoltage conditions on the charger input?

The device monitors voltage between VDD and VM pins for overvoltage charger events. At 8.0V (±2V), it immediately pulls CO low to disable the charge MOSFET; recovery occurs at 7.3V (±2V) with no delay. This protects against faulty or mismatched chargers and operates independently of battery voltage, leveraging the 30V VDD–VM absolute maximum rating for robustness.

Can the AP9101CAK-AGTRG1 be used with 2-cell battery packs?

No - the AP9101CAK-AGTRG1 is specified exclusively for 1-cell Li+ or Li-polymer batteries, with VDD–VSS operating range of 1.5V to 5.5V and overcharge detection up to 4.5V. For 2-cell configurations requiring ~8.4V full-charge monitoring, Diodes' AP9211 or AP9221 series - designed for 2S protection with higher voltage ratings - must be used instead.