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STMicroelectronics LDK320AM25R
- Part No.:
- LDK320AM25R
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LDK320AM25R.pdf
- Description:
- IC REG LINEAR 2.5V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,382
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Product details
Overview
LDK320AM25R from STMicroelectronics is a 2.5 V fixed-output, 200 mA low-dropout linear regulator in SOT23-5L package, featuring 100 mV typical dropout at 100 mA, ±0.5% output voltage accuracy at 25 °C, and 88 dB PSRR at 120 Hz. It supports logic-controlled shutdown (EN pin), operates from 2.5 V to 18 V input, and stabilizes with 1 μF ceramic output capacitor - ideal for power rails in portable DSC and BD/DVD systems.
For engineers reviewing the LDK320AM25R datasheet, LDK320AM25R pinout, LDK320AM25R application, or LDK320AM25R equivalent, key selection criteria include dropout performance under 200 mA load, thermal shutdown behavior at 160 °C, EN logic thresholds (0.4 V low / 1.2 V high), and compatibility with low-ESR ceramic capacitors across -40 °C to 125 °C operating range.
Technical Context
The LDK320AM25R implements a bandgap-referenced op-amp control loop with internal current limiting, thermal shutdown (160 °C, 20 °C hysteresis), and SOA protection. Its architecture enables stable regulation with 1 μF ceramic COUT while maintaining <63 μVRMS noise (10 Hz–100 kHz) and high PSRR (88 dB @ 120 Hz, 65 dB @ 1 kHz).
It features dual-package support: SOT23-5L includes IN, GND, EN, ADJ/NC, and OUT pins; the fixed-output LDK320AM25R uses ADJ pin as NC. The SOT-89 variant omits EN and ADJ functionality - confirming this part is exclusively available in SOT23-5L with enable control and high-accuracy output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±0.5% at 25 °C - ensures precision biasing for ADC references or low-voltage microcontrollers. |
| Max Output Current | 200 mA - sufficient for powering single-core MCUs, sensors, or interface ICs without external pass devices. |
| Dropout Voltage | 100 mV typ. @ 100 mA - enables operation down to VIN = 2.6 V, critical for single-cell Li-ion or coin-cell battery systems. |
| Quiescent Current | 60 μA typ. active / 1 μA in shutdown - extends battery life in always-on monitoring circuits. |
| PSRR | 88 dB @ 120 Hz - suppresses ripple from noisy DC-DC converters feeding the LDO input. |
| Operating Temp | -40 °C to +125 °C junction - qualified for industrial and automotive cabin applications. |
| Enable Threshold | VENL ≤ 0.4 V, VENH ≥ 1.2 V - compatible with 1.8 V / 3.3 V GPIO without level-shifting. |
Pinout & Package
SOT23-5L package: compact 2.92 mm × 2.80 mm × 1.25 mm surface-mount outline with exposed pad for thermal enhancement (RthJA = 160 °C/W). Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = ADJ/NC (no-connect for fixed version), Pin 5 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 2.5–18 V DC; requires ≥1 μF ceramic input capacitor for stability. |
| 2 (GND) | Power ground reference | Common return path for input, output, and internal bias; must be low-impedance. |
| 3 (EN) | Logic-enable control | Active-high: drives >1.2 V to enable regulator; ≤0.4 V forces shutdown (<1 μA IQ). |
| 4 (ADJ/NC) | Adjust pin (fixed version) | No-connect on LDK320AM25R; must be left floating - not tied to GND or OUT. |
| 5 (OUT) | Regulated output | Delivers 2.5 V ±0.5% with ≤15 mV load regulation (SOT23-5L, 1–200 mA). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 100 mV typ. @ 100 mA enables use with input voltages as low as 2.6 V for 2.5 V output. |
| Ceramic capacitor compatible | Stable with 1 μF COUT (ESR < 1 Ω) - eliminates need for costly tantalum or aluminum electrolytics. |
| High-accuracy output | ±0.5% tolerance at 25 °C (LDK320A grade) - reduces post-regulation trimming in precision analog signal chains. |
| Integrated protections | Thermal shutdown (160 °C), current limit (~330 mA), and SOA safeguard against overloads and faults. |
| Low-noise operation | 63 μVRMS output noise (10 Hz–100 kHz) - suitable for powering RF receivers and high-resolution ADCs. |
Applications
| Portable Imaging Systems | Optical Disc Players |
|---|---|
|
Use Scenario: Powering image sensor bias and analog front-end in digital still cameras (DSC). IC Role / Device Role / Timing Role: Provides clean, low-noise 2.5 V rail for CCD/CMOS sensor analog circuitry and ADC reference. Use Value: 63 μVRMS noise and 88 dB PSRR prevent switching noise from DC-DC converters from degrading image SNR. |
Use Scenario: Supplying servo motor drivers and laser diode bias in BD/DVD players. IC Role / Device Role / Timing Role: Delivers stable 2.5 V for precision DACs controlling focus/tracking actuators. Use Value: ±0.5% output accuracy ensures consistent laser power calibration across temperature (-40 °C to 125 °C). |
| Industrial HMIs | Embedded PC Peripherals |
|
Use Scenario: Regulating power for touch controller ICs and display interface logic in factory HMIs. IC Role / Device Role / Timing Role: Supplies 2.5 V to capacitive touch ASICs requiring low quiescent current during sleep mode. Use Value: 1 μA shutdown current extends battery backup runtime during panel standby states. |
Use Scenario: Generating auxiliary 2.5 V rail for USB PHY termination and PCIe clock buffers in mini-PCs. IC Role / Device Role / Timing Role: Acts as post-regulator for noise-sensitive timing circuits downstream of buck converters. Use Value: 100 mV dropout allows direct regulation from 3.3 V intermediate bus, minimizing heat dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70725PDQNR | 200 mA, 2.5 V fixed, 250 mV dropout @ 200 mA, 55 dB PSRR @ 1 kHz, SOT23-5 | Lacks thermal shutdown hysteresis and SOA protection; lower PSRR limits noise rejection in mixed-signal systems. | Prefer LDK320AM25R where thermal robustness and 88 dB PSRR are required for industrial ambient conditions. |
| MCP1700T-2502E/TT | 250 mA, 2.5 V fixed, 178 mV dropout @ 250 mA, 60 μA IQ, SOT23-3 (no EN) | No enable pin; only 3-pin package limits system-level power sequencing control. | Choose LDK320AM25R when GPIO-controlled shutdown and precise 200 mA delivery are mandatory. |
Compared with TLV70725PDQNR and MCP1700T-2502E/TT, the LDK320AM25R delivers superior PSRR, integrated thermal hysteresis, and guaranteed 100 mV dropout - making it optimal for noise-critical, thermally demanding, and sequenced-power applications.
Availability
LDK320AM25R is available at Aetrix Electronics and suitable for portable imaging systems, optical disc players, industrial HMIs, and embedded PC peripherals requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LDK320AM25R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The LDK320 series belongs to ST's high-accuracy, low-quiescent-current LDO portfolio, engineered specifically for battery-powered and noise-sensitive applications where precision regulation, thermal resilience, and minimal board space are critical.
FAQ
What is the minimum input voltage required for regulation at 2.5 V output?
The LDK320AM25R maintains regulation down to VIN = VOUT + VDROP. With 100 mV typical dropout at 100 mA, the minimum functional input is 2.6 V. At 200 mA, worst-case dropout is 350 mV (per Table 6), so VIN ≥ 2.85 V is recommended for full-load stability across temperature.
Can the ADJ pin be left unconnected on the LDK320AM25R?
Yes - Pin 4 (ADJ/NC) is explicitly designated "not connected" for fixed-output versions like LDK320AM25R. It must remain floating; connecting it to GND, OUT, or any voltage violates the datasheet and may cause regulation instability or damage.
Does the LDK320AM25R require an input capacitor?
Yes - a minimum 1 μF ceramic capacitor (X5R/X7R) is required between IN and GND, placed as close as possible to the device. This prevents oscillation during line transients and ensures stability per Figure 25 and Section 6 of DS11321.
How does thermal shutdown behave during sustained overload?
Thermal shutdown activates at 160 °C junction temperature with 20 °C hysteresis. Once triggered, the device disables output until junction cools to ~140 °C, then automatically resumes regulation - no manual reset is needed, and repeated cycling is safe within SOA limits.
LDK320AM25R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 88dB ~ 48dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LDK320AM25R FAQ
1.How can I place an order for LDK320AM25R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDK320AM25R 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 LDK320AM25R reliable?
The price and inventory of LDK320AM25R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK320AM25R is usually 5 days.
3.What payment methods are accepted for LDK320AM25R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK320AM25R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDK320AM25R?
LDK320AM25R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDK320AM25R 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 LDK320AM25R?
For technical support, including LDK320AM25R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK320AM25R requirements.
6.How does Aetrix verify that LDK320AM25R is sourced from the original manufacturer or authorized distributors?
All LDK320AM25R 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 LDK320AM25R meets industry standards.
7.What is the process for return or replacement of LDK320AM25R?
All LDK320AM25R units undergo pre-shipment inspection (PSI). If there is an issue with LDK320AM25R, 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 LDK320AM25R part is unused and in its original packaging.
Return procedure for LDK320AM25R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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