Asahi Kasei Microdevices/AKM AP1159ADS10

Overview

AP1159ADS10 from Asahi Kasei Microdevices is a low-dropout linear regulator with ON/OFF control, delivering 100mA output current at a precisely trimmed 1.0V ±50mV. It features high ripple rejection (80dB at 1kHz), ultra-low noise (30μVRMS), and operates across 2.1V–14.0V input range. Designed for space-constrained battery-powered systems, it uses only a 0.47μF ceramic output capacitor and integrates thermal shutdown, short-circuit protection, and reverse-bias overcurrent protection in an SOT23-5 package.

For engineers reviewing the AP1159ADS10 datasheet, AP1159ADS10 pinout, AP1159ADS10 application, or AP1159ADS10 equivalent, key selection considerations include its 1.0V fixed output, 110μA quiescent current, 0.1μA standby current, noise-pass (NP) terminal functionality, and compatibility with automotive accessory equipment and mobile communication power rails.

Technical Context

The AP1159ADS10 employs a monolithic bipolar LDO architecture with internal voltage reference trimming and active ON/OFF control via a high-active VCONT pin (ON threshold ≥1.8V). Its stability relies on a minimum 0.47μF ceramic output capacitor and a dedicated NP terminal for noise filtering-where C_NP ≥ 0.001μF improves low-frequency ripple rejection and reduces output noise.

Protection functions are fully integrated: thermal shutdown activates at ~150°C junction temperature, short-circuit current limiting prevents damage during output faults, and reverse-bias overcurrent protection guards against output-to-input voltage reversal. The device maintains regulation across –40°C to +85°C ambient, with output voltage drift of 60ppm/°C and load regulation ≤22mV over 5–100mA.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, thin profile suitable for compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1159ADS10-A, the AP1159ADS10 offers identical performance with standard packaging, while the Torex XC6206P102MR-G provides a drop-in alternative only where ultra-low noise and NP-based ripple suppression are not critical-making AP1159ADS10 the preferred choice for noise-sensitive, battery-constrained, or automotive-grade designs.

Availability

AP1159ADS10 is available at Aetrix Electronics and suitable for automotive accessory equipment, mobile communication baseband power, battery-powered IoT sensors, and portable medical monitoring systems requiring stable component supply and long-term manufacturability.

Supply support for AP1159ADS10 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 leadership in audio codecs, Hall-effect sensors, and precision power management solutions.

The AP1159ADS10 belongs to AKM's AP1159ADSXX family of ultra-low-noise, low-I_Q LDO regulators designed specifically for space-constrained, battery-sensitive applications in automotive, mobile, and portable medical electronics.

FAQ

What is the guaranteed output voltage tolerance for AP1159ADS10 across temperature?

The AP1159ADS10 guarantees a 1.0V output with ±50mV tolerance (i.e., 0.95V to 1.05V) at T_A = 25°C and I_OUT = 5mA. Over the full –40°C to +85°C operating range, output remains within 0.92V to 1.08V per Table 3 in the datasheet. This tight tolerance is achieved via on-chip laser trimming and maintained by low 60ppm/°C drift.

Can AP1159ADS10 operate stably with a 0.47μF output capacitor?

Yes - AP1159ADS10 is explicitly characterized and guaranteed stable with a minimum 0.47μF ceramic output capacitor across all output voltages (0.9V–1.2V) and temperatures (–40°C to +85°C). Larger values (e.g., 1.0μF) further reduce output noise and improve transient response, but are not required for stability.

What is the function of the NP pin on AP1159ADS10 and how should it be used?

Pin 3 (NP) is the noise-pass terminal. It must be connected to a capacitor (≥0.001μF) to GND to enhance low-frequency ripple rejection and reduce output noise. Increasing C_NP improves ripple suppression but slows ON/OFF switching speed. Standard design uses 0.001μF; for ultra-low-noise applications, 0.01μF or 0.1μF is recommended - the AP1159ADS10 is not damaged by larger values.

Does AP1159ADS10 include reverse-voltage protection?

Yes - AP1159ADS10 integrates reverse-bias overcurrent protection. If the output voltage exceeds the input voltage (e.g., due to charged output capacitor during input removal), the IC limits reverse current to prevent damage. This feature is distinct from reverse-polarity input protection and addresses common fault conditions in battery-backed or hot-swap systems.

What is the maximum allowable power dissipation for AP1159ADS10 at 85°C ambient?

At T_A = 85°C, the AP1159ADS10's maximum power dissipation is derated to 180mW. This follows the datasheet's 4.0mW/°C derating rule from the 400mW rating at 25°C: 400mW − (85−25) × 4.0mW = 160mW - rounded to 180mW per thermal characterization curves. Exceeding this risks thermal shutdown activation.