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STMicroelectronics LD39030DTPU105R
- Part No.:
- LD39030DTPU105R
- Manufacturer:
- STMicroelectronics
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
LD39030DTPU105R.pdf
- Description:
- IC REG LINEAR 1.05V 300MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,989
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Product details
Overview
LD39030DTPU105R from STMicroelectronics is a 300 mA ultra-low-dropout linear voltage regulator delivering 1.05 V output with ±2.0 % tolerance at 25 °C, 300 mV typical dropout at 300 mA, 20 µA quiescent current at no load, and logic-controlled shutdown. It operates from 1.5–5.5 V input and supports ceramic output capacitors as low as 0.47 µF - optimized for space-constrained, battery-powered mobile and portable systems.
For engineers reviewing the LD39030DTPU105R datasheet, LD39030DTPU105R pinout, LD39030DTPU105R application, or LD39030DTPU105R equivalent, this part offers verified performance in low-noise, low-quiescent-current power rail generation where thermal efficiency, fast enable response (100 µs turn-on), and integrated output discharge are critical selection criteria.
Technical Context
The LD39030DTPU105R implements a PMOS pass transistor architecture enabling ultra-low dropout (300 mV typ. @ 300 mA) and high PSRR (80 dB @ 1 kHz). Its internal soft-start circuit limits inrush current without external components, while the dedicated EN pin controls active/shutdown states with sub-0.1 µA standby current.
It integrates an output discharge MOSFET (enabled per ordering code "DTPU" suffix), allowing rapid VOUT collapse during disable. Stability is guaranteed with 0.47–22 µF ceramic COUT and requires only 1 µF CIN - both compatible with X5R/X7R dielectrics across –40 °C to 125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.05 V ±2.0 % at 25 °C - tight regulation enables direct powering of low-voltage I/O rails (e.g., 1.0 V–1.2 V logic cores) |
| Max Output Current | 300 mA guaranteed - sufficient for RF transceivers, camera ISPs, or multi-core microcontrollers in portable devices |
| Dropout Voltage | 330 mV max @ 300 mA, –40 °C to 125 °C - allows operation down to VIN = 1.38 V while maintaining 1.05 V output |
| Quiescent Current | 20 µA typ. @ no load - extends battery life in always-on sensor nodes or standby modes |
| PSRR | 80 dB @ 1 kHz, 55 dB @ 100 kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails |
| Enable Threshold | VEN(H) ≥ 1 V, VEN(L) ≤ 0.4 V - compatible with 1.2 V, 1.8 V, and 3.3 V GPIO logic without level-shifting |
| Output Discharge | Integrated MOSFET (RON ≈ 100 Ω) - discharges COUT within milliseconds upon EN deassertion, preventing residual voltage hold-up |
Pinout & Package
Supplied in DFN4 1×1 mm, 0.4 mm height package with exposed thermal pad connected to GND - optimized for minimal PCB footprint and thermal performance in dense layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Regulated output node | Delivers stable 1.05 V; requires 0.47–22 µF ceramic capacitor to GND for loop stability |
| 2 GND | Analog and power ground reference | Common return for IN, OUT, EN; thermal pad must be soldered to PCB GND plane for thermal management |
| 3 EN | Logic-controlled enable input | Active-high; drives device into <0.1 µA shutdown when pulled low; 100 nA input leakage minimizes system-level current draw |
| 4 IN | Input voltage supply | Accepts 1.5–5.5 V; requires 1 µF ceramic capacitor placed adjacent to pin for EMI filtering and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 300 mV typ. @ 300 mA - enables use with single-cell Li-ion (2.8–4.2 V) or coin-cell (3 V) sources while sustaining full load |
| Low-noise regulation | 45 µVRMS output noise (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like ADC references or RF LDO post-regulation |
| Internal soft-start | 100 µs controlled ramp-up - eliminates output overshoot and reduces inrush stress on upstream power stages |
| Ceramic capacitor support | Stable with COUT ≥ 0.47 µF, ESR < 10 Ω - eliminates need for costly tantalum or electrolytic capacitors, reducing BOM cost and size |
| Thermal & current protection | 160 °C thermal shutdown with 20 °C hysteresis + internal current limiting - ensures safe operation under overload or ambient extremes |
Applications
| Mobile Phone Power Management | Digital Still Camera (DSC) Sensor Bias |
|---|---|
|
Use Scenario: Providing clean, low-noise 1.05 V bias to image signal processors (ISPs) and CMOS sensors during capture mode. IC Role / Device Role / Timing Role: Primary low-dropout post-regulator for analog sensor front-end, synchronized to frame-readout timing. Use Value: 45 µVRMS noise and 80 dB PSRR prevent switching artifacts from baseband DC/DC from corrupting image data. |
Use Scenario: Supplying stable 1.05 V to high-speed memory interfaces (e.g., LPDDR2 I/O) during burst write operations. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling memory VDDQ rail from noisy system power domains. Use Value: 300 mA capability and 100 µs soft-start ensure glitch-free memory initialization without violating setup/hold timing. |
| Tablet SoC Core Rail Support | Cordless Phone Baseband IC |
|
Use Scenario: Delivering 1.05 V to low-power Cortex-M or RISC-V subsystems in always-on tablet companion chips. IC Role / Device Role / Timing Role: Standby-mode LDO enabling wake-on-USB or motion-sensor interrupts with sub-µA quiescent draw. Use Value: 0.03 µA shutdown current extends weeks-long battery life in idle state without compromising wake latency. |
Use Scenario: Regulating 1.05 V for DECT/GAP protocol baseband ICs operating from 3.7 V Li-ion packs. IC Role / Device Role / Timing Role: Input-stage LDO buffering battery voltage fluctuations during RF transmit bursts. Use Value: 330 mV max dropout ensures uninterrupted 1.05 V output even as cell voltage drops to 3.0 V under load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B102MR-G | 1.0 V output, ±2 % accuracy, 250 mV dropout @ 300 mA, no integrated discharge MOSFET | Lacks output discharge; requires external circuitry for fast VOUT collapse | Select when board space permits discrete discharge solution and 1.0 V (vs. 1.05 V) is acceptable for target load |
| Richtek RT9013-10GB | 1.0 V output, ±2 %, 200 mV dropout @ 300 mA, 25 µA IQ, no discharge, SOT-23-5 package | Larger SOT-23-5 footprint; higher thermal resistance (300 °C/W vs. 250 °C/W) | Prefer for legacy SMT lines supporting SOT-23 but accept trade-off in thermal performance and missing discharge function |
Compared with LD39030DTPU105R, the XC6210B102MR-G saves 50 mV dropout but forfeits integrated discharge and thermal pad cooling; the RT9013-10GB offers lower dropout and same IQ but increases PCB area and thermal impedance - making LD39030DTPU105R optimal for compact, thermally constrained, discharge-critical designs.
Availability
LD39030DTPU105R is available at Aetrix Electronics and suitable for mobile phones, digital still cameras, and cordless phone systems requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability validation.
Supply support for LD39030DTPU105R 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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The LD39030 belongs to ST's high-accuracy, ultra-low-IQ LDO family targeting battery-powered portable electronics - engineered specifically for minimal footprint, fast transient response, and seamless integration with modern low-voltage SoCs and sensors.
FAQ
What is the minimum output capacitance required for stable operation of LD39030DTPU105R?
The LD39030DTPU105R is stable with a minimum effective output capacitance of 220 nF, but STMicroelectronics specifies 0.47 µF as the recommended minimum for guaranteed stability across –40 °C to 125 °C, full load range (0–300 mA), and input voltage variation (1.5–5.5 V). X5R or X7R ceramic types are advised for consistent ESR and capacitance over temperature.
Does LD39030DTPU105R include output voltage discharge functionality?
Yes - the "DTPU" ordering suffix explicitly denotes inclusion of the integrated output discharge MOSFET (RON ≈ 100 Ω), which activates automatically when the EN pin is driven low. This feature rapidly discharges the output capacitor to near-zero volts, eliminating residual voltage that could cause latch-up or false wake events in downstream circuitry.
What is the maximum allowable input voltage for continuous operation?
The absolute maximum input voltage is 7 V, but the recommended operating input voltage range is 1.5 V to 5.5 V per the datasheet's electrical characteristics table. Exceeding 5.5 V may degrade long-term reliability or trigger overvoltage protection not specified in the device's functional design - sustained operation above 5.5 V is not guaranteed.
How does the thermal pad on the DFN4 1×1 package affect performance?
The exposed thermal pad on the LD39030DTPU105R's DFN4 1×1 package must be soldered to a PCB GND plane to achieve the rated RthJA of 250 °C/W. Omitting thermal pad connection increases junction-to-ambient resistance by >100 °C/W, risking thermal shutdown at loads above ~150 mA - especially in enclosed or non-ventilated environments.
LD39030DTPU105R 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):
- 1.05V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.33V @ 300mA
- Current - Output:
- 300mA
- 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)
LD39030DTPU105R FAQ
1.How can I place an order for LD39030DTPU105R through Aetrix?
Please submit a Request for Quotation (RFQ) for LD39030DTPU105R 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 LD39030DTPU105R reliable?
The price and inventory of LD39030DTPU105R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD39030DTPU105R is usually 5 days.
3.What payment methods are accepted for LD39030DTPU105R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD39030DTPU105R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD39030DTPU105R?
LD39030DTPU105R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD39030DTPU105R 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 LD39030DTPU105R?
For technical support, including LD39030DTPU105R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD39030DTPU105R requirements.
6.How does Aetrix verify that LD39030DTPU105R is sourced from the original manufacturer or authorized distributors?
All LD39030DTPU105R 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 LD39030DTPU105R meets industry standards.
7.What is the process for return or replacement of LD39030DTPU105R?
All LD39030DTPU105R units undergo pre-shipment inspection (PSI). If there is an issue with LD39030DTPU105R, 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 LD39030DTPU105R part is unused and in its original packaging.
Return procedure for LD39030DTPU105R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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