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Asahi Kasei Microdevices/AKM AP1159ADS09
- Part No.:
- AP1159ADS09
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP1159ADS09.pdf
- Description:
- IC REG LINEAR 0.9V 100MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,562
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Product details
Overview
AP1159ADS09 from Asahi Kasei Microdevices is a low-dropout linear regulator with ON/OFF control, delivering 100mA output current at a precisely trimmed 0.9V (±50mV) output voltage. It features high ripple rejection (80dB at 1kHz), ultra-low noise (30μVRMS), and operates across a wide input range of 2.1V to 14.0V - ideal for space-constrained battery-powered systems requiring stable low-voltage biasing.
For engineers reviewing the AP1159ADS09 datasheet, AP1159ADS09 pinout, AP1159ADS09 application, or AP1159ADS09 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated SOT23-5 pin functions, and two confirmed alternative LDOs for 0.9V/100mA use cases with thermal and reverse-bias protection.
Technical Context
The AP1159ADS09 uses a monolithic bipolar structure to achieve tight DC accuracy (±50mV over -40°C to +85°C) and low quiescent current (110μA typical at zero load). Its integrated NP (noise pass) terminal enables configurable noise suppression via an external capacitor, directly influencing both output noise (30μVRMS) and ripple rejection performance.
Control logic is high-active: VCONT ≥1.8V enables regulation; VCONT ≤0.35V disables output with standby current <0.1μA. Protection includes thermal shutdown (Tj = 150°C), short-circuit limiting, and reverse-bias overcurrent detection - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 0.9V ±50mV (guaranteed over -40°C to +85°C); enables precise core/bias rail for low-voltage logic or RF circuitry. |
| Max Output Current | 100mA continuous; supports microcontrollers, sensors, and analog front-ends in portable equipment. |
| Ripple Rejection | 80dB at 1kHz (VIN=2.3V); suppresses switching noise from upstream DC/DC converters feeding sensitive analog stages. |
| Output Noise | 30μVRMS (100Hz–80kHz); meets low-noise requirements for ADC references, PLL power, and audio bias rails. |
| Quiescent Current | 110μA typical (IOUT=0mA); extends battery life in always-on monitoring or sleep-mode applications. |
| Standby Current | 0.1μA max (VCONT=0V); ensures negligible drain during system hibernation or shutdown states. |
| Input Voltage Range | 2.1V to 14.0V; accommodates single-cell Li-ion (2.7–4.2V), multi-cell alkaline, or automotive accessory rails. |
Pinout & Package
SOT23-5 package: 2.9mm × 1.6mm × 1.1mm profile with gull-wing leads; optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCONT | ON/OFF control input | High-active enable: ≥1.8V turns regulator on; ≤0.35V forces shutdown with <0.1μA supply draw. |
| 2 - GND | Power ground reference | Common return path for VIN, VOUT, and internal protection circuits; must be low-impedance for stability. |
| 3 - NP | Noise pass terminal | Connects to GND via 0.001μF–0.1μF capacitor to reduce output noise and improve low-frequency ripple rejection. |
| 4 - VOUT | Regulated output | Delivers stable 0.9V ±50mV; requires ≥0.47μF ceramic capacitor (low-ESR) for guaranteed loop stability. |
| 5 - VIN | Input supply | Accepts 2.1V–14.0V; dropout voltage increases with load but remains functional down to ~1.0V headroom at 100mA. |
Key Features
| Feature | Design Value |
|---|---|
| 0.47μF minimum output capacitance | Enables stable operation across full temperature and voltage range without requiring larger or higher-ESR capacitors. |
| Integrated reverse-bias overcurrent protection | Prevents damage when VOUT > VIN (e.g., charged output capacitor during input removal), eliminating need for external diode. |
| Thermal shutdown with auto-recovery | Halts output at Tj = 150°C and resumes regulation once junction cools - avoids permanent latch-off during transient overload. |
| NP terminal for noise tailoring | Allows designers to trade off switching speed vs. noise/ripple performance by selecting NP capacitor value (0.001–0.1μF). |
| Low-ESR ceramic capacitor compatibility | Eliminates risk of oscillation with standard X5R/X7R MLCCs; avoids costly tantalum or polymer alternatives. |
Applications
| Automotive Accessory Power | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering CAN transceiver bias rails and microcontroller I/O banks in vehicle infotainment modules. IC Role / Device Role / Timing Role: Low-noise 0.9V LDO supplying clean power to digital logic and interface circuitry under varying battery conditions (9–16V). Use Value: 80dB ripple rejection prevents switching noise from engine-control DC/DC from corrupting CAN signal integrity. |
Use Scenario: Providing regulated supply to ultra-low-power pulse oximeter analog front-end and ADC reference. IC Role / Device Role / Timing Role: Precision 0.9V rail generator with <30μVRMS noise, enabling high-SNR photodiode signal acquisition. Use Value: NP-capacitor tuning reduces broadband noise below 10μVRMS, improving SpO₂ measurement resolution. |
| Wearable Fitness Tracker | Industrial IoT Edge Node |
|
Use Scenario: Supplying real-time clock (RTC) and sensor hub in coin-cell–powered wristband designs. IC Role / Device Role / Timing Role: Always-on 0.9V regulator with 0.1μA standby current, activated only during sensor sampling bursts. Use Value: Sub-microamp shutdown current extends CR2032 battery life beyond 12 months in intermittent-use mode. |
Use Scenario: Biasing RS-485 transceiver and low-power MCU in remote environmental monitoring node. IC Role / Device Role / Timing Role: Input-tolerant 14V-rated LDO delivering stable 0.9V to isolated communication ICs operating from unregulated solar-charged battery. Use Value: Wide 2.1–14.0V input range eliminates need for pre-regulation stage, reducing BOM count and board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, 0.9V/100mA LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2204-0.9TRG1 | CMOS-based; lower IQ (50μA) but higher dropout (250mV @ 100mA); no NP pin for noise tuning. | Lacks NP terminal - unsuitable where sub-20μVRMS noise or 80dB+ ripple rejection is required. | Choose for ultra-low-power sleep modes where noise is secondary to quiescent current. |
| TPS7A0509PDBVR | Advanced CMOS process; 150mA rating, 20μVRMS noise, but requires ≥1μF output cap and no reverse-bias protection. | No integrated reverse-bias overcurrent protection - mandates external diode in battery-backup configurations. | Prefer when higher output current margin and tighter noise spec are needed, and reverse-voltage risk is mitigated externally. |
Compared with AP1159ADS09, AP2204-0.9TRG1 trades noise performance for lower IQ, while TPS7A0509PDBVR offers higher current and lower noise but removes reverse-bias protection and increases minimum output capacitance - making AP1159ADS09 uniquely balanced for compact, robust, noise-sensitive 0.9V rails.
Availability
AP1159ADS09 is available at Aetrix Electronics and suitable for automotive accessory equipment, portable medical sensors, wearable fitness trackers, industrial IoT edge nodes, and battery-powered mobile communication systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP1159ADS09 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 manufacturer specializing in analog, mixed-signal, and sensor solutions for automotive, industrial, and consumer markets.
The AP1159 series was designed specifically for space-constrained, low-noise applications demanding high accuracy, ultra-low standby current, and integrated protection - targeting battery-powered and automotive accessory systems.
FAQ
What is the guaranteed output voltage tolerance for AP1159ADS09 over temperature?
The AP1159ADS09 guarantees output voltage of 0.9V ±50mV across the full operating temperature range of -40°C to +85°C, as specified in Table 3 of the datasheet. This tolerance includes initial trim accuracy, line/load regulation, and temperature drift (60ppm/°C), ensuring reliable performance in automotive and industrial environments where ambient temperature varies widely.
Can AP1159ADS09 operate stably with a 0.47μF ceramic output capacitor?
Yes, AP1159ADS09 is explicitly characterized and guaranteed stable with a minimum 0.47μF ceramic capacitor (X5R/X7R) on VOUT, per Section 11.9. Stability is maintained across all output voltages (0.9–1.2V), temperatures (-40°C to +85°C), and load currents (0–100mA), provided the capacitor has low ESR - eliminating need for larger or specialized capacitors.
What protection features are integrated into AP1159ADS09?
AP1159ADS09 integrates four protection functions: thermal shutdown (activates at Tj = 150°C with auto-recovery), short-circuit current limiting, reverse-bias overcurrent protection (prevents damage when VOUT > VIN), and overcurrent sensing. These are fully internal - no external components required - enhancing reliability in unpredictable power environments like automotive or battery-backed systems.
How does the NP pin affect AP1159ADS09 performance?
The NP (Noise Pass) pin on AP1159ADS09 connects to an internal noise-filtering node. Adding a capacitor (0.001–0.1μF) from NP to GND reduces output noise and improves low-frequency ripple rejection. Larger values enhance noise suppression but slow ON/OFF transient response - allowing designers to optimize for either quiet operation or fast enable timing based on system needs.
What is the maximum input voltage rating for AP1159ADS09?
The absolute maximum input voltage for AP1159ADS09 is 16V, but the recommended operating range is 2.1V to 14.0V per Section 9. Operation at 14.0V is fully supported across temperature and load conditions, making it suitable for 12V automotive accessory rails and industrial supplies where transient spikes may reach 14V.
AP1159ADS09 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 192 µA
- Current - Supply (Max):
- 3.3 mA
- PSRR:
- 80dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AP1159ADS09 FAQ
1.How can I place an order for AP1159ADS09 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1159ADS09 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AP1159ADS09 reliable?
The price and inventory of AP1159ADS09 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1159ADS09 is usually 5 days.
3.What payment methods are accepted for AP1159ADS09?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1159ADS09 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1159ADS09?
AP1159ADS09 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1159ADS09 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AP1159ADS09?
For technical support, including AP1159ADS09 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1159ADS09 requirements.
6.How does Aetrix verify that AP1159ADS09 is sourced from the original manufacturer or authorized distributors?
All AP1159ADS09 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP1159ADS09 meets industry standards.
7.What is the process for return or replacement of AP1159ADS09?
All AP1159ADS09 units undergo pre-shipment inspection (PSI). If there is an issue with AP1159ADS09, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AP1159ADS09 part is unused and in its original packaging.
Return procedure for AP1159ADS09:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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