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STMicroelectronics LDK320AM36R
- Part No.:
- LDK320AM36R
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LDK320AM36R.pdf
- Description:
- IC REG LINEAR 3.6V 200MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,501
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Product details
Overview
LDK320AM36R from STMicroelectronics is a 3.6 V fixed-output, high-accuracy (±0.5% @ 25 °C), low-dropout linear regulator delivering up to 200 mA with 100 mV typical dropout at 100 mA, 88 dB PSRR at 120 Hz, and 60 μA quiescent current - designed for power-sensitive consumer electronics including digital still cameras and BD/DVD players.
For engineers reviewing the LDK320AM36R datasheet, LDK320AM36R pinout, LDK320AM36R application, or LDK320AM36R equivalent, this page delivers verified electrical specs, SOT23-5L package details, thermal protection behavior, enable-controlled shutdown (<1 μA off-mode current), and ceramic-capacitor stability (1 μF COUT compatible).
Technical Context
The LDK320AM36R implements a bandgap-referenced op-amp control loop with internal bias generator and thermal/short-circuit/SOA protections. Its architecture supports stable regulation across input voltages from 2.5 V to 18 V while maintaining tight output accuracy over −40 °C to +125 °C junction temperature.
Logic-controlled EN pin enables active-high operation (EN ≥ 1.2 V) and deep shutdown (EN ≤ 0.4 V), with <100 nA enable pin leakage. The device is optimized for low-noise, high-PSRR performance in battery-powered systems where load transients and line rejection are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.6 V ±0.5% at 25 °C; ±1.5% over full temperature range - ensures precise rail generation for 3.3 V–3.6 V logic and analog subsystems. |
| Dropout Voltage | 100 mV typ. @ 100 mA (3.3 V version); ≤350 mV max @ 200 mA - enables regulation from 3.95 V input at full load, extending battery runtime. |
| PSRR | 88 dB @ 120 Hz; 65 dB @ 1 kHz - suppresses ripple from noisy DC-DC stages feeding sensitive analog circuits like image sensors or audio codecs. |
| Quiescent Current | 60 μA typ. @ no load; ≤1 μA in shutdown - minimizes standby drain in always-on camera modules or remote controls. |
| Output Noise | 63 μVRMS (10 Hz–100 kHz) - low enough for powering RF front-ends or precision ADC references without added filtering. |
| Thermal Shutdown | 160 °C with 20 °C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking in compact enclosures. |
| Capacitor Compatibility | Stable with 1 μF ceramic output capacitor (ESR as low as 0.01 Ω) - eliminates need for bulk electrolytic caps, reducing BOM count and board area. |
Pinout & Package
LDK320AM36R is packaged in SOT23-5L (5-pin surface-mount), with exposed pad for thermal enhancement. Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NC (not connected - fixed-voltage version), Pin 5 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 2.5–18 V DC; must be decoupled with ≥1 μF ceramic capacitor close to pin to ensure stability and transient response. |
| 2 (GND) | Power ground reference | Common return path for input, output, and enable circuits; requires low-impedance PCB connection to minimize noise coupling. |
| 3 (EN) | Enable control input | Active-high logic interface: ≥1.2 V enables regulation; ≤0.4 V forces shutdown with sub-1 μA total current draw. |
| 4 (NC) | No connect | Internally unconnected; must remain floating - not tied to GND or any other node to avoid parasitic leakage or latch-up risk. |
| 5 (OUT) | Regulated output voltage | Delivers 3.6 V ±0.5% to load; requires ≥1 μF ceramic capacitor directly at pin for phase margin and transient recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 100 mV typical at 100 mA enables use with single-cell Li-ion (3.0–4.2 V) or 5 V rails down to 3.7 V without dropout. |
| High PSRR at low frequency | 88 dB @ 120 Hz rejects switching noise from upstream buck converters, critical for clean power to image signal processors. |
| Sub-μA shutdown mode | 0.2–1 μA off-state current extends shelf life and battery hold time in portable devices with long idle periods. |
| Integrated protection suite | Current limiting, SOA foldback, and thermal shutdown with hysteresis prevent failure under short-circuit or ambient overheating. |
| Ceramic capacitor compatibility | Stable with 1–22 μF X5R/X7R ceramics (ESR down to 0.01 Ω) - eliminates polarized capacitors and reduces footprint by >50% vs. tantalum. |
Applications
| Portable Imaging Systems | Digital Home Entertainment |
|---|---|
|
Use Scenario: Powering CMOS image sensor bias and analog front-end in compact digital still cameras (DSC) with variable battery voltage. IC Role / Device Role / Timing Role: Primary 3.6 V LDO supplying sensor analog core and PLL circuitry; EN pin synchronized to capture trigger for zero-power standby. Use Value: 63 μVRMS noise and 88 dB PSRR prevent image streaking or color banding caused by power rail interference. |
Use Scenario: Regulating 3.6 V supply for Blu-ray disc player servo motor drivers and laser diode bias circuits. IC Role / Device Role / Timing Role: Secondary LDO post-regulator after main 5 V DC-DC, providing isolated low-noise rail for precision analog control loops. Use Value: 100 mV dropout allows operation down to 3.7 V input during brownout conditions, preventing unexpected disc ejection or read errors. |
| Industrial Human-Machine Interfaces | PC Peripheral Controllers |
|
Use Scenario: Supplying 3.6 V to touch controller ICs and display driver ASICs in factory-floor HMIs exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Temperature-stable voltage source with ±1.5% accuracy over −40 °C to +125 °C junction range. Use Value: Thermal shutdown with 20 °C hysteresis avoids thermal cycling failures during continuous operation in unventilated enclosures. |
Use Scenario: Providing regulated 3.6 V to USB hub controllers and embedded flash memory interfaces in desktop/laptop docking stations. IC Role / Device Role / Timing Role: Low-quiescent-current LDO enabling USB suspend/resume compliance with <1 μA off-mode draw. Use Value: 60 μA operating IQ minimizes self-heating and maintains USB power budget headroom during multi-port enumeration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, high-PSRR LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P362MR | 3.6 V fixed, ±2% accuracy, 150 mV dropout @ 100 mA, 50 μA IQ, no EN pin | Lacks enable control and thermal shutdown; lower accuracy limits use in precision analog rails | Select only when EN functionality and ±0.5% tolerance are not required, and cost is primary constraint. |
| Richtek RT9013-36GB | 3.6 V fixed, ±2% accuracy, 250 mV dropout @ 150 mA, 65 μA IQ, EN pin included | Higher dropout and looser tolerance reduce usable input voltage range and system margin | Acceptable for non-critical digital I/O rails where 3.6 V ±2% is sufficient and thermal protection is handled externally. |
Compared with XC6206P362MR and RT9013-36GB, LDK320AM36R offers superior accuracy (±0.5% vs. ±2%), lower dropout (100 mV vs. ≥150 mV), and integrated thermal/short-circuit protection - making it the only choice for battery-powered imaging and industrial HMI applications demanding reliability and precision.
Availability
LDK320AM36R is available at Aetrix Electronics and suitable for portable imaging systems, digital home entertainment devices, industrial human-machine interfaces, and PC peripheral controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LDK320AM36R 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 microcontrollers, power management ICs, sensors, and analog components for automotive, industrial, and consumer markets.
The LDK320 series belongs to ST's high-PSRR, ultra-low-IQ LDO product line, engineered specifically for battery-powered consumer electronics where efficiency, noise immunity, and thermal robustness are critical design constraints.
FAQ
What is the minimum input voltage required for LDK320AM36R to maintain regulation at 200 mA load?
The minimum input voltage is calculated as VOUT + VDROP(max). At 200 mA and −40 °C to +125 °C, maximum dropout is 350 mV per Table 6. Therefore, minimum VIN = 3.6 V + 0.35 V = 3.95 V. Below this, output voltage drops below specification.
Can LDK320AM36R be used with a 10 μF ceramic output capacitor?
Yes - the datasheet confirms stability with 1–22 μF ceramic capacitors (X5R/X7R), including 10 μF. Figure 25 shows stable operation across ESR values from 0.01 Ω to 1 Ω at 10 μF, confirming robust phase margin without external compensation.
Does LDK320AM36R include reverse polarity or reverse current protection?
No - the device lacks internal reverse-voltage or reverse-current blocking. If input can fall below output (e.g., during hot-swap or backup battery scenarios), an external Schottky diode between IN and OUT is required to prevent backfeed and potential damage.
How does the EN pin behave during power-up when VIN ramps slowly?
EN threshold is guaranteed 0.4 V (low) and 1.2 V (high) over −40 °C to +125 °C. With slow VIN ramp, EN remains inactive until VIN exceeds ~1.2 V, ensuring the LDO stays off until sufficient input voltage is established - preventing brownout-induced output glitches.
LDK320AM36R 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):
- 3.6V
- 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
LDK320AM36R FAQ
1.How can I place an order for LDK320AM36R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDK320AM36R 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 LDK320AM36R reliable?
The price and inventory of LDK320AM36R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK320AM36R is usually 5 days.
3.What payment methods are accepted for LDK320AM36R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK320AM36R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDK320AM36R?
LDK320AM36R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDK320AM36R 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 LDK320AM36R?
For technical support, including LDK320AM36R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK320AM36R requirements.
6.How does Aetrix verify that LDK320AM36R is sourced from the original manufacturer or authorized distributors?
All LDK320AM36R 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 LDK320AM36R meets industry standards.
7.What is the process for return or replacement of LDK320AM36R?
All LDK320AM36R units undergo pre-shipment inspection (PSI). If there is an issue with LDK320AM36R, 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 LDK320AM36R part is unused and in its original packaging.
Return procedure for LDK320AM36R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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