Diodes Incorporated AP9101CAK-BBTRG1

Overview

AP9101CAK-BBTRG1 from Diodes Incorporated is a single-chip lithium-ion battery protection IC for 1-cell packs, featuring overcharge detection at 4.375 V ±25 mV, overdischarge detection at 2.500 V ±35 mV, and discharge overcurrent detection at 0.150 V ±15 mV. It integrates fixed delay timing, 0V battery charge enable, and selectable power-down mode, and is used in portable power tools and medical battery packs to prevent cell damage during charge/discharge cycles.

For engineers reviewing the AP9101CAK-BBTRG1 datasheet, AP9101CAK-BBTRG1 pinout, AP9101CAK-BBTRG1 application, or AP9101CAK-BBTRG1 equivalent, this page delivers verified voltage thresholds, confirmed SOT25 package mapping, validated terminal roles (VM/VDD/VSS/DO/CO), and real-world use cases in Li+ pack design-no generic claims or inferred functionality.

Technical Context

The AP9101CAK-BBTRG1 implements dual-path MOSFET control via separate CO (charge) and DO (discharge) gate drivers, with independent voltage and current fault detection circuits. Its VM pin monitors voltage drop across a sense resistor to detect charge/discharge overcurrent and short-circuit conditions with µs-level response for short detection.

It features factory-programmed thresholds: overcharge detection at 4.375 V, release at 4.175 V; overdischarge detection at 2.500 V, release at 2.900 V; and discharge overcurrent at 0.150 V. The device supports 0V battery charging and offers selectable power-down mode with 0.01 µA typical standby current.

Key Specifications

Pinout & Package

AP9101CAK-BBTRG1 is packaged in SOT25 (5-pin), with pin 1 marked and terminals arranged as VM–VDD–VSS–DO–CO (top view). The NC pin is absent in this variant; all five pins are functional and electrically assigned per Diodes DS37771 Rev. 8–3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP9101CAK-BBTRG1, the AB-TRG1 variant removes power-down dependency on charger presence but raises overcharge voltage by 50 mV, while the AH-TRG1 lowers overcurrent sensitivity by half-requiring careful trade-off between fault responsiveness and false-trigger immunity in final layout.

Availability

AP9101CAK-BBTRG1 is available at Aetrix Electronics and suitable for power tools, medical portable devices, wearables, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.

Supply support for AP9101CAK-BBTRG1 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 ICs, with manufacturing certified to IATF 16949 and products compliant with AEC-Q standards.

The AP9101C series belongs to Diodes' battery protection IC product line, designed specifically for cost-sensitive, space-constrained 1-cell Li+ applications requiring high-accuracy voltage monitoring and integrated MOSFET control without external timing components.

FAQ

What is the function of the VM pin on AP9101CAK-BBTRG1?

The VM pin serves as the current-sense input, measuring voltage drop across an external sense resistor between the battery's P– terminal and the load/charger path. It enables detection of discharge overcurrent, charge overcurrent, and short-circuit conditions by comparing VM–VSS or VM–VDD against internal thresholds. Its 30 V absolute maximum rating ensures robustness against polarity reversal and surge transients.

Does AP9101CAK-BBTRG1 support 0V battery charging, and how is it enabled?

Yes, AP9101CAK-BBTRG1 includes factory-enabled 0V battery charging functionality. When the battery voltage reaches 0 V due to self-discharge, the IC permits the charger to initiate trickle charge once the charger voltage exceeds 1.2 V at the VDD pin. This feature is permanently configured during wafer sort and cannot be disabled or reprogrammed in the field.

How does the power-down mode operate, and what wakes the device?

When power-down mode is active, the AP9101CAK-BBTRG1 enters ultra-low-current sleep (0.01 µA typ), disabling all protection functions and forcing both CO and DO into high-impedance state. Wake-up occurs exclusively via charger connection: applying ≥1.2 V to VDD while VM is pulled toward VSS through the charger path resets the IC into normal operation mode.

Can AP9101CAK-BBTRG1 be used in 2-cell battery packs?

No. AP9101CAK-BBTRG1 is rated for 1-cell Li+ operation only, with VDD–VSS operating range of 1.5 V to 5.5 V and overcharge detection fixed at 4.375 V. For 2-cell packs requiring ~8.4 V full-charge cutoff, Diodes' AP9211 or AP9221 series-designed for 2S configurations with higher voltage ratings and dual-cell balancing interfaces-are appropriate alternatives.