Diodes Incorporated AP9101CK-ASTRG1

Overview

AP9101CK-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 built-in fixed delay timing with no external capacitor required. It controls external N-channel MOSFETs via DO (discharge gate) and CO (charge gate) pins in portable power tools, Bluetooth headsets, and wearable medical monitors.

For engineers reviewing the AP9101CK-ASTRG1 datasheet, AP9101CK-ASTRG1 pinout, AP9101CK-ASTRG1 application, or AP9101CK-ASTRG1 equivalent, this device supports selectable 0V battery charge function and power-down mode, delivers 3.0µA typical operating current, and operates across –40°C to +85°C with 30V VM–VDD tolerance - critical for compact, high-reliability Li+ pack designs.

Technical Context

The AP9101CK-ASTRG1 integrates precision voltage comparators, current-sense amplifiers, and logic-controlled gate drivers in a single CMOS die. Its dual-threshold hysteresis (e.g., 3.800V detect / 3.700V release for overcharge) prevents oscillation during marginal battery transitions, while fixed internal delay timers (tCU = 1.0s typ, tDOC = 12ms typ) eliminate external RC components.

It implements independent protection paths: CO pin disables charging when VDD > 3.800V or VM–VSS < –0.180V (charge overcurrent), while DO pin disables discharging when VDD < 2.300V or VM–VSS > 0.180V (discharge overcurrent). The VM pin senses both charge/discharge current and charger presence via R2 resistor feedback.

Key Specifications

Pinout & Package

AP9101CK-ASTRG1 is housed in a RoHS-compliant SOT25 (5-pin) surface-mount package with 0.95mm pitch, optimized for space-constrained battery management modules.

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, the AP9101CK-ASTRG1 provides tighter voltage tolerances (±25mV vs ±50mV), eliminates external timing components, and uniquely combines 0V charge enablement with 30V VM–VDD robustness - making it optimal for next-gen compact, high-safety Li+ packs.

Availability

AP9101CK-ASTRG1 is available at Aetrix Electronics and suitable for power tools, wireless headsets, wearable medical monitors requiring stable component supply, long-term lifecycle assurance, and RoHS/Green compliance.

Supply support for AP9101CK-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification per AEC-Q100/101 standards.

The AP9101C series belongs to Diodes' Battery Protection IC product line, engineered specifically for high-accuracy, low-power, single-cell Li+ pack safety - targeting portable industrial, medical, and consumer applications demanding reliability and minimal external components.

FAQ

What is the function of the VM pin on AP9101CK-ASTRG1?

The VM pin serves as the bidirectional current-sense input: during discharge, it measures voltage drop across the sense resistor (R2) between P– and VM to detect overcurrent; during charging, its relative voltage to VSS determines charge overcurrent condition. It also enables overvoltage charger detection when referenced to VDD, with 30V absolute maximum rating ensuring robustness against charger transients.

Does AP9101CK-ASTRG1 support automatic recovery from overdischarge without a charger?

No - AP9101CK-ASTRG1 uses the power-down mode variant (indicated by blank suffix in ordering code), requiring charger connection to exit overdischarge state. Unlike the AP9101CA auto-wake-up version, it does not monitor battery voltage autonomously in sleep mode; the 0V battery charge function only enables recharge initiation once the charger is attached and VDD rises above 1.2V.

How does the fixed delay time circuit affect design layout?

The internal fixed-delay circuit removes the need for external timing capacitors and associated PCB routing, reducing component count by two and eliminating capacitor placement sensitivity (e.g., ESR, leakage, temperature drift). This simplifies layout, improves production yield, and enhances long-term reliability - especially critical in high-vibration environments like power tools where capacitor solder joints may fatigue.

Can AP9101CK-ASTRG1 be used with lithium iron phosphate (LiFePO₄) cells?

No - its overcharge detection threshold is factory-set to 3.800V, optimized for Li-ion/Li-polymer chemistry with 4.2V max. LiFePO₄ cells require ~3.65V overcharge protection; using this part would result in premature charge cutoff and reduced capacity utilization. Diodes offers the AP9103 series for LiFePO₄-specific applications with adjustable thresholds down to 3.4V.