Asahi Kasei Microdevices/AKM AP1153ADS50

Overview

AP1153ADS50 from Asahi Kasei Microdevices is a 5.0V, ±1.5% accuracy low-dropout linear regulator in SOT23-5 package, delivering 100mA output current with 160mV dropout at full load, ultra-low 75μA quiescent current, and integrated ON/OFF control (high-active), thermal shutdown, and reverse-bias overcurrent protection - designed for space-constrained battery-powered systems and automotive accessories.

For engineers reviewing the AP1153ADS50 datasheet, AP1153ADS50 pinout, AP1153ADS50 application, or AP1153ADS50 equivalent, key selection considerations include its 2.1–14.0V input range, 0.22μF minimum ceramic output capacitor requirement, 80dB ripple rejection at 1kHz, 35ppm/°C output voltage drift, and noise bypass (NP) terminal enabling <50μV_rms output noise with proper C_NP selection.

Technical Context

The AP1153ADS50 employs a monolithic bipolar LDO architecture with internal bandgap reference, precision trimming, and built-in protection circuitry. Its control loop stabilizes output using only a 0.22μF ceramic capacitor, enabled by low-ESR tolerance and optimized phase margin across 1.3–5.0V output variants.

ON/OFF functionality is implemented via a high-active VCONT pin with internal 500kΩ pull-down; activation threshold is 1.8V (ON) and 0.35V (OFF). The dedicated NP terminal connects to a bypass capacitor to suppress reference noise and improve PSRR - critical for low-noise analog and RF subsystems.

Key Specifications

Pinout & Package

AP1153ADS50 is housed in a 5-pin SOT23-5 surface-mount package (2.9 × 1.6 × 1.1 mm, 0.95 mm pitch), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700-5002E/TO and XC6206P502MR-G, the AP1153ADS50 uniquely combines 5.0V precision (±1.5%), NP-terminal noise suppression, reverse-bias overcurrent protection, and 2.1V minimum input - making it optimal for automotive and battery-backed industrial designs demanding robustness and low noise.

Availability

AP1153ADS50 is available at Aetrix Electronics and suitable for automotive accessory equipment, portable medical sensor nodes, industrial IoT edge controllers, and mobile communication modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for AP1153ADS50 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

Asahi Kasei Microdevices (AKM) is a Japanese semiconductor company specializing in analog, mixed-signal, and sensor ICs, with core expertise in precision power management and audio solutions.

The AP1153ADSXX series is part of AKM's low-noise, space-saving LDO portfolio, engineered specifically for automotive, industrial, and portable electronics where small footprint, high accuracy, and robust protection are mandatory.

FAQ

What is the guaranteed output voltage tolerance for AP1153ADS50 over temperature?

The AP1153ADS50 guarantees ±1.5% output voltage accuracy (±50 mV) over the full operating temperature range of –40°C to +85°C, as confirmed in Table 5 of the datasheet (015000869-E-00, p.10). At 25°C, the typical output is 5.000 V with min/max of 4.925 V / 5.075 V.

Can AP1153ADS50 operate with a 0.22μF output capacitor, and is it stable across all output voltages?

Yes - the AP1153ADS50 is explicitly characterized for stable operation with a minimum 0.22μF ceramic output capacitor across its entire 1.3–5.0V output range, per Section 11.8 (p.21). Stability is maintained regardless of V_OUT, provided the capacitor is low-ESR ceramic (X5R/X7R) and rated for full temperature/voltage range.

What is the function of the NP pin on AP1153ADS50, and what capacitor value is recommended?

The NP (Noise Bypass) pin on AP1153ADS50 connects to an external capacitor that filters reference noise and improves PSRR. Datasheet Section 11.11 recommends C_NP = 0.001–0.1 μF (typical 0.01 μF), with larger values reducing output noise - e.g., 0.01 μF achieves <50 μV_rms at 5.0V output. The AP1153ADS50 remains undamaged even with oversized C_NP.

Does AP1153ADS50 include reverse-bias protection, and how does it behave under reverse-voltage conditions?

Yes - AP1153ADS50 integrates reverse-bias overcurrent protection, as stated in Section 2 (p.1) and Absolute Maximum Ratings (p.6). When V_OUT exceeds V_IN, the device limits reverse current to prevent damage. For V_OUT ≤ 2.0V, max reverse voltage is 6V; for V_OUT ≥ 2.1V, it is 12V - ensuring safe operation in battery-backup or hot-swap scenarios.

What is the maximum junction temperature and thermal derating behavior of AP1153ADS50?

The AP1153ADS50 incorporates thermal shutdown that activates at ~140°C junction temperature (T_j). With θ_JA = 185°C/W on a standard 2-layer PCB (p.23), power dissipation must be derated above 25°C at 5.4 mW/°C. At 75°C ambient, maximum allowable P_D drops to ~677 mW × (1 – (75–25)/115) ≈ 420 mW - limiting usable I_OUT at high V_IN–V_OUT.