My Inquiry
My Account
STMicroelectronics LD39020ADTPU11R
- Part No.:
- LD39020ADTPU11R
- Manufacturer:
- STMicroelectronics
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
LD39020ADTPU11R.pdf
- Description:
- IC REG LINEAR 1.1V 200MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,759
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD39020ADTPU11R from STMicroelectronics is a 200 mA ultra-low-dropout linear voltage regulator with 1.1 V fixed output, 200 mV typical dropout at full load, ±2.0 % output accuracy at 25 °C, and logic-controlled enable/shutdown. It delivers stable power to low-power RF and sensor rails in compact portable devices such as Bluetooth earbuds and wearable health monitors.
For engineers reviewing the LD39020ADTPU11R datasheet, LD39020ADTPU11R pinout, LD39020ADTPU11R application, or LD39020ADTPU11R equivalent, key selection criteria include its 20 µA quiescent current at no load, 0.03 µA shutdown current, ceramic-capacitor compatibility (≥0.47 µF), internal soft-start, and optional output discharge MOSFET - all critical for battery life and system-level power sequencing integrity.
Technical Context
The LD39020ADTPU11R employs a bandgap-referenced error amplifier with internal bias generation and thermal protection circuitry. Its EN pin controls a high-impedance input stage that drives an internal pass transistor, enabling fast turn-on (100 µs) and sub-1 µA standby current.
It integrates a dedicated output discharge MOSFET (RON = 100 Ω) activated during shutdown, ensuring rapid VOUT collapse without external components. Stability is guaranteed with ceramic output capacitors ≥0.47 µF and ESR <15 Ω across –40 °C to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.1 V ±2.0 % at 25 °C - enables direct powering of low-voltage I/O domains in modern microcontrollers. |
| Max Output Current | 200 mA guaranteed - sufficient for powering RF transceivers, MEMS sensors, or low-power DSP cores. |
| Dropout Voltage | 200 mV typ. at 200 mA - allows operation from single-cell Li-ion (3.0 V min) or two-cell alkaline (2.4 V min) with margin. |
| Quiescent Current | 20 µA typ. at no load - minimizes battery drain during idle states in always-on sensing applications. |
| Shutdown Current | 0.03 µA typ. - reduces system standby power to nanoampere level, extending shelf life of sealed medical devices. |
| PSRR | 80 dB @ 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding mixed-signal analog circuits. |
| Output Capacitor | Compatible with 0.47 µF ceramic - eliminates need for bulky tantalum or electrolytic caps, saving PCB area in space-constrained wearables. |
Pinout & Package
LD39020ADTPU11R is packaged in DFN4 1x1 (1.0 mm × 1.0 mm, 0.4 mm height), optimized for ultra-dense portable designs. Thermal pad must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.5–5.5 V; requires ≥1 µF ceramic capacitor placed adjacent to minimize high-frequency impedance. |
| 2 (GND) | Power and signal reference | Common return for input/output paths and internal bandgap reference; connects to thermal pad on PCB. |
| 3 (EN) | Logic-enable control input | Active-high (VIH ≥1 V); pulls device into <0.1 µA shutdown when driven low - enables precise power gating. |
| 4 (OUT) | Regulated output | Delivers 1.1 V ±2 %; supports optional discharge MOSFET activation during EN deassertion. |
| Thermal Pad | Exposed ground connection | Internally tied to GND; mandatory for thermal dissipation and EMI reduction - must be soldered to solid copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 200 mV at 200 mA - enables regulation from near-dead batteries while maintaining system uptime. |
| Internal soft-start | 100 µs controlled ramp - prevents inrush current spikes that could destabilize shared input rails in multi-rail systems. |
| Output discharge | Integrated 100 Ω MOSFET - discharges output capacitance within microseconds upon shutdown, preventing back-powering of downstream logic. |
| Ceramic capacitor support | Stable with 0.47–22 µF X5R/X7R - eliminates ESR dependency, simplifies BOM, and improves transient response vs. tantalum alternatives. |
| High PSRR | 80 dB @ 1 kHz, 55 dB @ 100 kHz - maintains clean analog supply for ADCs, PLLs, and RF front-ends in noisy PMIC environments. |
Applications
| Bluetooth Audio Earbuds | Wearable ECG Monitors |
|---|---|
Use Scenario: Powering Bluetooth LE radio and ultra-low-power MCU in true wireless stereo (TWS) earbuds with 40 mAh lithium-polymer cells. IC Role / Device Role / Timing Role: Primary LDO for 1.1 V digital core rail, sequenced via host MCU's GPIO to match RF transmit/receive duty cycles. Use Value: 20 µA quiescent current extends active listening time by >12 % versus legacy LDOs; 0.03 µA shutdown preserves charge during multi-week storage. | Use Scenario: Supplying analog front-end (AFE) and SAR ADC in clinical-grade wearable ECG patch operating continuously for 72+ hours. IC Role / Device Role / Timing Role: Low-noise 1.1 V bias source for precision op-amps and reference buffers, synchronized with acquisition trigger pulses. Use Value: 45 µVRMS output noise (10 Hz–100 kHz) ensures <1 LSB error in 12-bit ECG digitization; 80 dB PSRR rejects DC/DC ripple from companion buck converter. |
| Smart Ring Sensors | IoT Asset Trackers |
Use Scenario: Regulating power to MEMS motion sensors and NFC interface in ring-form-factor fitness trackers with 15 mm² PCB real estate. IC Role / Device Role / Timing Role: Compact-area LDO delivering 1.1 V to sensor hub IC, enabled only during motion-triggered sampling bursts. Use Value: DFN4 1x1 footprint saves >60 % board area vs. SOT23-5L; internal discharge MOSFET eliminates need for external bleed resistor, reducing component count. | Use Scenario: Providing stable 1.1 V supply to GNSS receiver and cellular modem in battery-powered logistics tags deployed for 5+ years. IC Role / Device Role / Timing Role: Always-on LDO for RTC and wake-up controller, with EN pin gated by accelerometer interrupt to initiate GPS fix only on movement. Use Value: –40 °C to 125 °C operating range ensures reliability in uncontrolled outdoor environments; 160 °C thermal shutdown prevents field failures under solar loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B112MR-G | 1.1 V fixed, ±2 % accuracy, 250 mA max, but no output discharge MOSFET and higher 35 µA IQ. | Lacks integrated discharge; requires external circuit for fast VOUT collapse - increases BOM cost and layout complexity. | Choose if discharge function is unnecessary and higher PSRR (90 dB @ 1 kHz) is prioritized over shutdown current. |
| Richtek RT9080AL-11PU5 | 1.1 V fixed, ±2 %, 300 mA, 25 µA IQ, but no thermal shutdown hysteresis and wider 0.5–5.5 V input range. | No thermal hysteresis may cause cycling in sustained overload; broader VIN complicates input filtering design. | Select when higher output current headroom is needed and thermal robustness is managed externally via system-level monitoring. |
Compared with XC6210B112MR-G and RT9080AL-11PU5, LD39020ADTPU11R uniquely combines nanoampere shutdown, integrated discharge, and guaranteed thermal hysteresis - making it optimal for energy-harvesting and long-life sealed systems where every µA and millisecond matters.
Availability
LD39020ADTPU11R is available at Aetrix Electronics and suitable for Bluetooth audio earbuds, wearable ECG monitors, and smart ring sensors requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LD39020ADTPU11R 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, specializing in power management, analog, and microcontroller solutions for industrial, automotive, and consumer markets.
The LD39020 series belongs to ST's ultra-low-IQ LDO portfolio, designed specifically for battery-powered edge devices demanding nanoscale standby power, rapid enable/disable control, and minimal PCB footprint without sacrificing thermal or noise performance.
FAQ
What is the minimum output capacitor required for stability?
The LD39020ADTPU11R is stable with a minimum 0.47 µF X5R/X7R ceramic capacitor on the output. While the control loop functions down to 220 nF, 0.47 µF is the recommended minimum to ensure stability across temperature, input voltage, and load variations per Figure 17 in DS9956. Lower values risk oscillation under worst-case conditions.
Does the LD39020ADTPU11R require an input capacitor?
Yes - a minimum 1 µF ceramic capacitor is required on the IN pin, placed as close as possible to the device with low-inductance routing to GND. This capacitor filters high-frequency noise and supplies transient current during load steps; omitting it risks instability and degraded PSRR performance, especially above 100 kHz.
How does the output discharge MOSFET operate?
The integrated discharge MOSFET activates automatically when the EN pin is pulled low, connecting VOUT to GND through a 100 Ω channel. This discharges the output capacitor rapidly (typically <1 ms for 1 µF), preventing back-powering of upstream logic or unintended wake-up events - eliminating the need for external discharge resistors or FETs.
Is the LD39020ADTPU11R compatible with lead-free reflow processes?
Yes - the DFN4 1x1 package is RoHS-compliant and qualified for standard lead-free reflow profiles (J-STD-020, peak temperature ≤260 °C). The thermal pad must be fully soldered to a PCB ground plane to meet thermal resistance specs (RthJA = 250 °C/W) and avoid delamination during repeated thermal cycling.
LD39020ADTPU11R 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):
- 1.1V
- 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)
LD39020ADTPU11R FAQ
1.How can I place an order for LD39020ADTPU11R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39020ADTPU11R 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 LD39020ADTPU11R reliable?
The price and inventory of LD39020ADTPU11R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39020ADTPU11R is usually 5 days.
3.What payment methods are accepted for LD39020ADTPU11R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39020ADTPU11R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39020ADTPU11R?
LD39020ADTPU11R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39020ADTPU11R 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 LD39020ADTPU11R?
For technical support, including LD39020ADTPU11R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39020ADTPU11R requirements.
6.How does Aetrix verify that LD39020ADTPU11R is sourced from the original manufacturer or authorized distributors?
All LD39020ADTPU11R 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 LD39020ADTPU11R meets industry standards.
7.What is the process for return or replacement of LD39020ADTPU11R?
All LD39020ADTPU11R units undergo pre-shipment inspection (PSI). If there is an issue with LD39020ADTPU11R, 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 LD39020ADTPU11R part is unused and in its original packaging.
Return procedure for LD39020ADTPU11R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD39020ADTPU11R Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
