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STMicroelectronics LD39020ADTPU08R
- Part No.:
- LD39020ADTPU08R
- Manufacturer:
- STMicroelectronics
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
LD39020ADTPU08R.pdf
- Description:
- IC REG LINEAR 0.8V 200MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,213
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Product details
Overview
LD39020ADTPU08R from STMicroelectronics is a high-accuracy, 200 mA low-dropout linear regulator with 0.8 V fixed output voltage, ultra-low dropout (200 mV typ. at 200 mA), ±0.5 % output tolerance at 25 °C, and logic-controlled enable. It operates from 1.5 V to 5.5 V input and delivers stable power to core logic rails in space-constrained portable devices such as mobile phone application processors and camera sensor modules.
For engineers reviewing the LD39020ADTPU08R datasheet, LD39020ADTPU08R pinout, LD39020ADTPU08R application, or LD39020ADTPU08R equivalent, key selection criteria include dropout voltage under full load, quiescent current in active and shutdown modes, PSRR at 1 kHz and 100 kHz, output discharge capability, and compatibility with 0.47 µF ceramic output capacitors in DFN4 1x1 packaging.
Technical Context
The LD39020ADTPU08R integrates a bandgap reference, error amplifier, and PMOS pass transistor in a fully internal compensation architecture stabilized with ≥0.47 µF ceramic output capacitance. Its soft-start circuit limits inrush current by controlling output ramp-up over ~100 µs without external components.
It features an integrated NMOS output discharge switch (enabled in ADT variants), logic-level enable input with 0.4 V low threshold and 1 V high threshold, and thermal shutdown with 160 °C trip point and 20 °C hysteresis - all operating across –40 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.8 V - matches modern low-voltage SoC core domains (e.g., ARM Cortex-A series CPU cores). |
| Max Output Current | 200 mA - sufficient for single-core microprocessor I/O or sensor interface power rails. |
| Dropout Voltage | 200 mV typ. @ 200 mA - enables regulation from 1.0 V input, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 20 µA typ. @ no load - minimizes standby power loss in always-on subsystems (e.g., RTC, wake-up logic). |
| PSRR | 80 dB @ 1 kHz, 55 dB @ 100 kHz - suppresses switching noise from adjacent DC-DC converters feeding intermediate supply rails. |
| Output Tolerance | ±0.5 % @ 25 °C - ensures precise voltage alignment with tight-core-voltage specifications of advanced digital ICs. |
| Enable Threshold | VIL = 0.4 V, VIH = 1 V - compatible with 1.2 V/1.8 V GPIO logic without level-shifting. |
| Shutdown Current | 0.03 µA typ. - reduces system leakage to sub-nA levels during deep sleep states. |
Pinout & Package
LD39020ADTPU08R is packaged in the DFN4 1x1 (1.0 mm × 1.0 mm, 0.4 mm height) thermally enhanced leadless package with exposed thermal pad. This footprint supports high-density PCB layouts and provides RthJA = 250 °C/W for efficient heat dissipation in compact handheld designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Regulated 0.8 V output - connects directly to load; requires ≥0.47 µF ceramic capacitor to GND for stability. |
| 2 | GND | Analog ground reference - must be connected to low-impedance PCB ground plane; thermal pad also tied to GND. |
| 3 | EN | Active-high enable input - driven high (>1 V) for regulation, low (<0.4 V) for shutdown and automatic output discharge. |
| 4 | IN | Input voltage supply (1.5–5.5 V) - requires ≥1 µF ceramic decoupling capacitor placed adjacent to pin. |
| Thermal Pad | GND | Internal thermal and electrical connection to die substrate - must be soldered to solid copper pour for thermal performance and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV @ 200 mA enables operation from single-cell Li-ion (3.0 V min) down to 0.8 V output with >2.2 V headroom margin. |
| Output discharge | Integrated 100 Ω NMOS discharges VOUT to GND within microseconds upon EN deactivation - prevents floating rail issues in multi-rail sequencing. |
| Ceramic capacitor support | Stable with COUT = 0.47 µF (X5R/X7R) - eliminates need for tantalum or electrolytic capacitors, reducing BOM cost and board area. |
| Soft-start | 100 µs controlled turn-on time - avoids inrush current spikes that could destabilize upstream supplies or trigger overcurrent protection. |
| High PSRR | 80 dB @ 1 kHz - maintains clean 0.8 V rail despite ripple on shared 3.3 V or 5 V intermediate supplies. |
| Wide temp range | –40 °C to +125 °C operation - qualified for automotive infotainment SoC core supplies and industrial edge sensor nodes. |
Applications
| Mobile Phone Core Rail | Digital Still Camera Sensor Bias |
|---|---|
|
Use Scenario: Powers ARM-based application processor core domain requiring tightly regulated 0.8 V at up to 200 mA during burst-mode operation. IC Role / Device Role / Timing Role: Primary LDO for SoC core voltage domain, delivering low-noise, fast-transient response power synchronized with CPU DVFS transitions. Use Value: Ultra-low quiescent current (20 µA) extends standby battery life; 200 mV dropout preserves regulation through battery discharge down to 1.0 V input. |
Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end (AFE) and PLL circuits in compact DSC modules. IC Role / Device Role / Timing Role: Low-noise post-regulator cleaning switched DC-DC output; output discharge ensures rapid sensor power-down between frames. Use Value: 45 µVRMS output noise and 80 dB PSRR prevent clock jitter and image banding; 0.47 µF ceramic compatibility saves board space. |
| Tablet Application Processor I/O | Cordless Phone Baseband IC |
|
Use Scenario: Provides 0.8 V I/O supply to memory interface and peripheral controllers in dual-core tablet SoCs. IC Role / Device Role / Timing Role: Secondary LDO supporting high-speed digital interfaces (e.g., SDIO, SPI) with strict voltage accuracy and transient response. Use Value: ±0.5 % output tolerance ensures signal integrity margins; 100 µs soft-start prevents bus contention during cold boot sequences. |
Use Scenario: Delivers stable 0.8 V to DSP and RF transceiver baseband sections in battery-operated cordless handsets. IC Role / Device Role / Timing Role: Low-quiescent-current regulator enabling long talk-time and standby duration while maintaining RF linearity. Use Value: 0.03 µA shutdown current extends shelf-life and idle battery life; thermal shutdown (160 °C) protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B082MR-G | 0.8 V fixed output, 150 mA max, 120 mV dropout @ 100 mA, no output discharge, ±2 % tolerance. | Lacks auto-discharge and tighter accuracy; suitable only where rail sequencing is externally managed. | Select when cost sensitivity outweighs need for precision or fast discharge - not recommended for SoC core rails. |
| Richtek RT9080AGQW | 0.8 V fixed output, 300 mA max, 250 mV dropout @ 300 mA, 25 µA IQ, no discharge, ±1 % tolerance. | Higher current capability but larger SOT-23-5 package (2.9 mm × 1.6 mm) and no discharge MOSFET. | Prefer for higher-load applications where board area is less constrained and discharge is handled externally. |
Compared with XC6210B082MR-G and RT9080AGQW, LD39020ADTPU08R uniquely combines 0.8 V/200 mA capability, ±0.5 % accuracy, integrated discharge, and DFN4 1x1 footprint - making it optimal for miniaturized, multi-rail battery systems demanding precision and sequencing control.
Availability
LD39020ADTPU08R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and cordless phone systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LD39020ADTPU08R 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 sensing solutions for automotive, industrial, and consumer markets.
LD39020 belongs to ST's high-accuracy, ultra-low-IQ LDO family targeting battery-powered portable electronics - engineered specifically for core voltage regulation in space- and power-constrained SoC subsystems.
FAQ
What is the minimum output capacitor required for stable operation?
The LD39020ADTPU08R is stable with a minimum effective output capacitance of 220 nF, but ST specifies 0.47 µF (X5R/X7R ceramic) as the recommended minimum to ensure stability across temperature, input voltage, and load variations. Lower values may cause oscillation under worst-case conditions.
Does LD39020ADTPU08R support adjustable output voltage?
No - LD39020ADTPU08R is a fixed-output device with factory-trimmed 0.8 V regulation. Adjustable versions (e.g., LD39020ADJ) are not offered in this order code; output voltage is set internally and cannot be modified via external resistors.
How does the output discharge function behave during shutdown?
When EN is pulled low, the internal 100 Ω NMOS discharge switch activates, pulling VOUT to GND. Discharge time depends on COUT; with 0.47 µF, VOUT falls from 0.8 V to <0.1 V in <500 µs. The switch remains on until EN returns high.
Can LD39020ADTPU08R be used with input voltages below 1.5 V?
No - the absolute minimum input voltage is 1.5 V per datasheet absolute maximum ratings. Operation below this risks functional failure or damage. At 0.8 V output, the lowest viable input is 1.0 V + dropout (≥1.2 V), but 1.5 V is the guaranteed operational floor.
LD39020ADTPU08R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 55dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-DFN (1x1)
LD39020ADTPU08R FAQ
1.How can I place an order for LD39020ADTPU08R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39020ADTPU08R 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 LD39020ADTPU08R reliable?
The price and inventory of LD39020ADTPU08R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39020ADTPU08R is usually 5 days.
3.What payment methods are accepted for LD39020ADTPU08R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39020ADTPU08R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39020ADTPU08R?
LD39020ADTPU08R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39020ADTPU08R 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 LD39020ADTPU08R?
For technical support, including LD39020ADTPU08R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39020ADTPU08R requirements.
6.How does Aetrix verify that LD39020ADTPU08R is sourced from the original manufacturer or authorized distributors?
All LD39020ADTPU08R 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 LD39020ADTPU08R meets industry standards.
7.What is the process for return or replacement of LD39020ADTPU08R?
All LD39020ADTPU08R units undergo pre-shipment inspection (PSI). If there is an issue with LD39020ADTPU08R, 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 LD39020ADTPU08R part is unused and in its original packaging.
Return procedure for LD39020ADTPU08R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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