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Asahi Kasei Microdevices/AKM AP1152ADU45
- Part No.:
- AP1152ADU45
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Package:
- SOT-89-5/6
- Datasheet:
-
AP1152ADU45.pdf
- Description:
- IC REG LINEAR 4.5V 300MA SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,050
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Product details
Overview
AP1152ADU45 from Diodes Incorporated is a 4.5V fixed-output, 300mA low-dropout linear regulator with high-accuracy voltage trimming (±1.5% or ±50mV), 105mV dropout at 100mA, and integrated on/off control (high-active). It operates from 2.1V to 14.5V input and supports ultra-low-noise applications such as RF power supplies and precision analog front-ends.
For engineers reviewing the AP1152ADU45 datasheet, AP1152ADU45 pinout, AP1152ADU45 application, or AP1152ADU45 equivalent, this page delivers verified technical context, package-specific pin functions, real-world application constraints, and validated alternative options for post-regulator, low-noise imaging, and automotive infotainment power designs.
Technical Context
The AP1152ADU45 implements a bandgap-referenced NPN pass transistor architecture with internal current-limiting and thermal shutdown circuitry. Its noise-bypass terminal (NP) enables configurable ripple rejection-80dB at 1kHz-with external capacitor tuning, and its built-in 500kΩ pull-down resistor on VCONT simplifies CMOS-level on/off control without external biasing.
Stability is achieved using ≥0.1µF ceramic output capacitance (rated for ≥2.5V VOUT), and the SOT89-5 package's exposed pad is not present-unlike the PLP1822-6 variant-so thermal performance relies solely on PCB copper area and trace width per JEDEC51-3 4-layer board guidelines (θJA = 138°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.500V (±1.5% or ±50mV tolerance over −40°C to +85°C) |
| Max Output Current | 300mA continuous (derated above 25°C; limited by thermal dissipation in SOT89-5) |
| Dropout Voltage | 105mV at 100mA load (enables regulation with VIN as low as 4.605V for 4.5V output) |
| Ripple Rejection | 80dB at 1kHz (requires CNP ≥0.001µF; improves with larger NP capacitor) |
| Quiescent Current | 65–90µA (IQ) at 25°C; drops to ≤0.1µA in standby (VCONT = 0V) |
| Operating Input Range | 2.1V to 14.5V (supports wide-input post-regulation after buck converters) |
| Thermal Shutdown | Activates at ~150°C junction temperature; auto-recovers upon cooling |
Pinout & Package
SOT89-5 package: 5-pin surface-mount device with gull-wing leads, no exposed thermal pad. Mounting requires standard reflow profile for plastic packages; thermal relief on GND pin recommended for solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NP | Noise Bypass Terminal | Connect 0.001–0.1µF capacitor to GND to improve low-frequency PSRR; larger values slow VCONT switching speed |
| 2 - GND | Ground Reference | Main signal and power return; must be low-impedance path to system ground plane |
| 3 - VCONT | On/Off Control Input | High-active logic: ≥1.8V = ON, ≤0.35V = OFF; internal 500kΩ pull-down eliminates need for external resistor |
| 4 - VIN | Input Supply | Accepts 2.1–14.5V; requires ≥1.0µF input capacitor close to pin for transient stability |
| 5 - VOUT | Regulated Output | Delivers stable 4.5V; requires ≥0.1µF ceramic output capacitor (≥2.5V rating) adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low-Noise Operation | Enables use in RF power stages and image sensor bias rails where <10µVRMS noise is critical |
| Small-Capacitor Stability | Stable with only 0.1µF ceramic output cap (≥2.5V rating), reducing BOM count and board space |
| Integrated Protection | Combines over-current limit, thermal shutdown, and reverse-bias protection-no external components needed |
| CMOS-Compatible Control | VCONT accepts direct connection to FPGA/GPIO without level-shifting or pull-up resistors |
| Wide Input Range | Supports direct regulation from 3.3V, 5V, or 12V rails-ideal for multi-rail embedded systems |
Applications
| RF Power Supply | PLL/VCO Bias Rail |
|---|---|
|
Use Scenario: Powers RF transceiver LNA and mixer stages in 5G IoT modules requiring clean, stable 4.5V supply. IC Role / Device Role / Timing Role: Low-noise post-regulator delivering ripple-free bias to sensitive analog RF blocks. Use Value: 80dB PSRR at 1kHz suppresses switching noise from upstream DC/DC converters, preserving EVM and SNR. |
Use Scenario: Supplies voltage-controlled oscillator and phase-locked loop circuits in timing-critical test equipment. IC Role / Device Role / Timing Role: Precision voltage reference source maintaining VCO tuning linearity and jitter performance. Use Value: ±50mV output accuracy ensures consistent center frequency across temperature, minimizing calibration drift. |
| Low-Noise Image Sensor Unit | Car Infotainment Audio Stage |
|
Use Scenario: Provides analog supply to CMOS image sensor ADC and analog front-end in automotive ADAS cameras. IC Role / Device Role / Timing Role: Ultra-low-noise LDO isolating sensor analog core from digital domain noise coupling. Use Value: NP terminal capacitor tuning reduces 1/f noise below 100Hz, preventing fixed-pattern noise in captured frames. |
Use Scenario: Powers Class AB audio amplifier bias rails and DAC reference in vehicle head units operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Automotive-grade linear regulator meeting AEC-Q100 stress requirements for infotainment subsystems. Use Value: Guaranteed operation across full industrial temp range with no derating up to 300mA, enabling compact heatsinkless design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP1152AEU45 | Same electrical specs but in PLP1822-6 package with exposed thermal pad; θJA = 83°C/W vs. 138°C/W | Better thermal performance in high-power-density layouts; requires via-stitched GND pad | Select when ambient temperature exceeds 65°C or power dissipation >400mW is expected |
| AP2202K-45 | Lower max current (150mA), higher dropout (250mV @100mA), no NP terminal; SOT-23-5 package | Limited to low-power logic rails; lacks noise-bypass capability for RF/analog use cases | Choose only for cost-sensitive, non-noise-critical digital I/O rails where footprint is constrained |
Compared with AP1152AEU45, the AP1152ADU45 trades thermal headroom for simpler layout and lower assembly cost; versus AP2202K-45, it delivers 2× current, 2.4× lower dropout, and dedicated noise suppression-making it irreplaceable in precision analog and RF supply chains.
Availability
AP1152ADU45 is available at Aetrix Electronics and suitable for RF power supplies, PLL/VCO bias rails, and automotive infotainment audio stages requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AP1152ADU45 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 for power management, signal integrity, and connectivity applications.
The AP1152 series was designed specifically for low-noise, high-PSRR post-regulation in RF, imaging, and automotive subsystems-emphasizing stability with minimal external components and robust thermal protection.
FAQ
What is the guaranteed output voltage tolerance for AP1152ADU45 across temperature?
The AP1152ADU45 guarantees output voltage within ±1.5% or ±50mV (whichever is greater) over the full operating temperature range of −40°C to +85°C, as confirmed in Table 3 of the datasheet. This tolerance applies under specified load (5mA) and input conditions (VIN = VOUT(TYP) + 1V), ensuring predictable performance in automotive and industrial environments where thermal drift must be tightly controlled. The AP1152ADU45 achieves this via laser-trimmed bandgap reference and precision feedback network.
Can AP1152ADU45 operate stably with only a 0.1µF output capacitor?
Yes-the AP1152ADU45 is explicitly characterized for stable operation with a minimum 0.1µF ceramic output capacitor rated for ≥2.5V, as stated in Section 1. General Description and Section 11.4. This enables compact designs in space-constrained applications like camera modules and wearables. However, stability depends on capacitor voltage coefficient and temperature behavior; X5R/X7R dielectrics are recommended, and larger values (e.g., 1.0µF) further improve load transient response and noise suppression. The AP1152ADU45 does not require ESR tuning, unlike older LDO architectures.
How does the NP (Noise Pass) terminal affect AP1152ADU45 performance?
The NP terminal on the AP1152ADU45 directly controls low-frequency power supply rejection: connecting a capacitor (0.001–0.1µF) between NP and GND increases PSRR below 10kHz, with diminishing returns beyond 0.01µF. As shown in Figure 15, larger NP capacitors also slow VCONT turn-on/turn-off timing due to RC filtering-critical in fast-switching power sequencing. The AP1152ADU45 datasheet specifies CNP = 0.001µF as baseline for 80dB @1kHz; designers may increase it for RF or audio bias rails where sub-kHz ripple is unacceptable. No damage occurs if CNP exceeds recommended values.
What thermal derating applies to AP1152ADU45 in SOT89-5 package?
In the SOT89-5 package, the AP1152ADU45 has a junction-to-ambient thermal resistance (θJA) of 138°C/W on a JEDEC51-3 4-layer board. At 25°C ambient, maximum continuous power dissipation is 900mW (per Absolute Maximum Ratings); above 25°C, power must be linearly derated-e.g., at 75°C ambient, max PD drops to ~550mW. For a 4.5V output and 12V input, this limits usable current to ~73mA at 75°C. The AP1152ADU45 includes thermal shutdown at ~150°C junction temperature, providing fault protection during overload or poor heatsinking.
Is AP1152ADU45 pin-compatible with other AP1152 variants like AP1152ADU33 or AP1152ADU50?
Yes-AP1152ADU45 shares identical SOT89-5 pinout, electrical interface, and functional behavior with all AP1152ADUXX variants (e.g., AP1152ADU33, AP1152ADU50). Only the output voltage differs (set by internal trimming during manufacturing); all share same VCONT logic, NP functionality, protection features, and thermal characteristics. This allows drop-in replacement across voltage points in existing designs-provided input/output capacitors and layout meet requirements for the new VOUT. The AP1152ADU45 datasheet confirms uniform pin configuration across the ADUXX family in Section 7.
AP1152ADU45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Asahi Kasei Microdevices/AKM
- Series:
- -
- Package/Case:
- SOT-89-5/6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 14.5V
- Voltage - Output (Min/Fixed):
- 4.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.44V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 3.6 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-89-5
AP1152ADU45 FAQ
1.How can I place an order for AP1152ADU45 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1152ADU45 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 AP1152ADU45 reliable?
The price and inventory of AP1152ADU45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1152ADU45 is usually 5 days.
3.What payment methods are accepted for AP1152ADU45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1152ADU45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1152ADU45?
AP1152ADU45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1152ADU45 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 AP1152ADU45?
For technical support, including AP1152ADU45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1152ADU45 requirements.
6.How does Aetrix verify that AP1152ADU45 is sourced from the original manufacturer or authorized distributors?
All AP1152ADU45 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 AP1152ADU45 meets industry standards.
7.What is the process for return or replacement of AP1152ADU45?
All AP1152ADU45 units undergo pre-shipment inspection (PSI). If there is an issue with AP1152ADU45, 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 AP1152ADU45 part is unused and in its original packaging.
Return procedure for AP1152ADU45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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