Diodes Incorporated AP9101CAK-ASTRG1

Overview

AP9101CAK-ASTRG1 from Diodes Incorporated is a single-chip lithium-ion battery protection IC for 1-cell packs, featuring overcharge detection at 3.800V ±25mV, overdischarge detection at 2.300V ±35mV, discharge overcurrent detection at 0.180V ±15mV, and integrated 0V battery charge functionality. It operates with 3.0µA typical current consumption in active mode and supports SOT25 packaging for compact portable power systems.

For engineers reviewing the AP9101CAK-ASTRG1 datasheet, AP9101CAK-ASTRG1 pinout, AP9101CAK-ASTRG1 application, or AP9101CAK-ASTRG1 equivalent, this device delivers precise voltage thresholds, fixed delay timing without external capacitors, selectable power-down mode, and high-voltage tolerance (30V between VDD and VM) for robust battery safety in space-constrained designs.

Technical Context

The AP9101CAK-ASTRG1 implements independent analog comparators for overcharge (VCU = 3.800V), overdischarge (VDL = 2.300V), discharge overcurrent (VDOC = 0.180V), short-circuit (VSHORT = 0.700V), and charge overcurrent (VCOC = −0.180V), each with configurable hysteresis and ±20% delay time accuracy. Its logic circuit controls CO and DO gate outputs to drive external N-channel MOSFETs in series configuration.

It integrates internal resistive dividers (RVMD = 100–650kΩ, RVMS = 5–65kΩ) for VM-sense path conditioning, supports 0V battery charging via factory-set option, and includes overvoltage charger detection (8.0V fixed, ±2V accuracy) with immediate CO shutdown-no delay circuit required.

Key Specifications

Pinout & Package

AP9101CAK-ASTRG1 is packaged in SOT25 (5-pin), a surface-mount package with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm height, optimized for high-density battery pack PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S-8261AAL-M6T1U and RP502K001B-TR-F, AP9101CAK-ASTRG1 provides tighter voltage tolerances (±25mV), eliminates external timing capacitors, supports 0V battery recovery, and withstands 30V VM–VDD differential-making it uniquely suited for high-reliability, long-shelf-life, and charger-agnostic 1-cell applications.

Availability

AP9101CAK-ASTRG1 is available at Aetrix Electronics and suitable for smart wearables, Bluetooth headsets, portable medical sensors, and IoT asset trackers requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP9101CAK-ASTRG1 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, computing, and consumer markets.

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

FAQ

What is the function of the VM pin on AP9101CAK-ASTRG1?

The VM pin serves as the current-sense input terminal that monitors the voltage difference between the battery's P− node and the sense resistor (R2). It enables detection of discharge overcurrent, charge overcurrent, and short-circuit conditions by comparing VM–VSS against internal thresholds (e.g., VDOC = 0.180V). Internal resistors RVMD and RVMS connect dynamically during fault states to condition the VM path.

Does AP9101CAK-ASTRG1 support automatic recovery from overdischarge without a charger?

No-AP9101CAK-ASTRG1 uses the power-down mode variant (indicated by blank suffix in ordering code), which requires charger connection to exit overdischarge state. Unlike the auto-wake-up version (e.g., AP9101CA), it does not recover autonomously when battery voltage rises above VDU; the charger must be applied to reset the protection latch and restore DO/CO high output.

How does the 0V battery charge function operate in practice?

When enabled (as in AP9101CAK-ASTRG1), the 0V charge function allows the charger to apply voltage to a fully depleted cell (0V) and initiate charging once VDD reaches ≥1.2V. The IC remains in power-down until sufficient voltage is present, then activates protection logic and permits CO to turn on the charge MOSFET-enabling safe recovery without manual intervention or external wake-up circuitry.

Can AP9101CAK-ASTRG1 be used with 2-cell battery configurations?

No-AP9101CAK-ASTRG1 is strictly designed for 1-cell Li+ or Li-polymer batteries with maximum VDD–VSS operating range of 1.5V to 5.5V. Its overcharge detection threshold (3.800V) and absolute maximum VDD–VSS rating (12V) do not support series-connected cells. For 2-cell applications, Diodes' AP9211 or AP9221 families are specified alternatives.