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STMicroelectronics LDK715PU50R
- Part No.:
- LDK715PU50R
- Manufacturer:
- STMicroelectronics
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
LDK715PU50R.pdf
- Description:
- IC REG LINEAR 5V 85MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,951
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Product details
Overview
LDK715PU50R from STMicroelectronics is a high-input-voltage, ultra-low-quiescent-current LDO linear regulator delivering 5.0 V at up to 85 mA output current, with 4.3–24 V input range, 500 mV typical dropout at full load, and −40 °C to 125 °C operating temperature-designed for battery-powered industrial sensors and mobile power rails.
For engineers reviewing the LDK715PU50R datasheet, LDK715PU50R pinout, LDK715PU50R application, or LDK715PU50R equivalent, key selection criteria include guaranteed 85 mA output under wide VIN, 5 µA quiescent current at full load, ceramic capacitor compatibility (0.47–10 µF), internal short-circuit protection, and DFN8 3x3 package thermal performance (RthJA = 52 °C/W).
Technical Context
The LDK715PU50R implements a bandgap reference-based control loop with internal current limiting and thermal shutdown. Its architecture supports stable regulation across 4.3–24 V input while maintaining ±1% output accuracy at 25 °C and ±2% over full temperature range.
It requires no external compensation and operates with ceramic output capacitors as low as 0.47 µF due to optimized phase margin design. The device features fast turn-on time (0.7 ms typical) and delivers 38 dB supply voltage rejection at 1 kHz, rising to 57 dB at 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 5.0 V ±1% at 25 °C; ±2% over −40 °C to 125 °C - ensures stable MCU core or sensor bias rail |
| Input voltage range | 4.3 V to 24 V DC - supports direct connection to 12 V industrial buses or multi-cell Li-ion packs |
| Max output current | 85 mA guaranteed - sufficient for low-power microcontrollers, RF transceivers, or analog front-ends |
| Dropout voltage | 500 mV typ. at 85 mA - enables regulation down to 5.5 V input when sourcing full load |
| Quiescent current | 5 µA typ. at full load - extends battery life in always-on monitoring nodes beyond 10 years on coin cells |
| Output noise | 210 µVRMS (200 Hz–100 kHz) - low enough for precision ADC references without added filtering |
| Thermal resistance | RthJA = 52 °C/W (DFN8 3x3) - allows 2 W max power dissipation at 25 °C ambient before derating |
Pinout & Package
LDK715PU50R is supplied in the DFN8 3×3 mm package (ECOPACK® compliant), featuring an exposed thermal pad for enhanced heat dissipation. The package has 8 terminals, with five internally unconnected pins optimized for mechanical stability and manufacturability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 4.3–24 V; requires ≥0.1 µF local bypass capacitor to GND for transient immunity |
| 2, 3, 5, 6, 7 (NC) | No internal connection | Must remain floating or grounded per layout guidelines; no electrical function or signal path |
| 4 (GND) | Power ground reference | Primary return path for load current and internal bias; connects directly to thermal pad for thermal conduction |
| 8 (OUT) | Regulated output | Delivers stable 5.0 V; requires 0.47–10 µF ceramic capacitor to GND for loop stability |
| Exposed pad | Thermal and ground plane | Must be soldered to PCB copper area ≥25 mm² for RthJA ≤52 °C/W; electrically tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 5 µA at full 85 mA load - enables >10-year operation on CR2032 in sleep-mode IoT endpoints |
| Ceramic capacitor compatibility | Stable with 0.47–10 µF X5R/X7R ceramics - eliminates costly tantalum or electrolytic capacitors |
| Internal current limit | 120 mA short-circuit current - protects downstream circuitry during fault without external foldback |
| Wide temperature operation | −40 °C to +125 °C junction range - qualified for under-hood automotive sensors and factory-floor PLC modules |
| High PSRR at RF frequencies | 57 dB @ 100 kHz - suppresses switching noise from adjacent DC/DC converters feeding mixed-signal systems |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor node deployed in remote HVAC ducts with 10+ year field life requirement. IC Role / Device Role / Timing Role: Primary 5 V LDO supplying MCU, BLE radio, and analog sensor interface. Use Value: 5 µA quiescent current enables >12-year runtime on two AA alkaline cells; 24 V input tolerance accommodates legacy 24 V building control wiring. | Use Scenario: Handheld pulse oximeter using single-cell Li-ion (3.0–4.2 V) with boost converter followed by precision 5 V rail. IC Role / Device Role / Timing Role: Post-regulator for noise-sensitive analog front-end and display driver IC. Use Value: 210 µVRMS output noise avoids ADC quantization errors; ±1% accuracy ensures consistent LED drive current calibration. |
| Smart Meter Auxiliary Rail | Automotive Body Control Module |
Use Scenario: Secondary 5 V rail in electricity meter powering real-time clock, secure element, and optical comms interface. IC Role / Device Role / Timing Role: Isolated auxiliary LDO fed from main 12 V bus, independent of primary power conversion. Use Value: 24 V input rating withstands load-dump transients; internal current limit prevents latch-up during ESD events on optical port. | Use Scenario: Cabin ambient light sensor module mounted near windshield, exposed to under-hood temperature extremes. IC Role / Device Role / Timing Role: Local 5 V regulator for photodiode amplifier and CAN transceiver logic supply. Use Value: −40 °C to 125 °C operation ensures functionality during cold cranking and summer parking; DFN8 thermal pad maintains junction <125 °C at 85 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B502MR-G | Same 5 V output, but only 50 mA rated current and 6 V max input - lacks 24 V capability and 85 mA drive | Suitable for low-current wearables; not viable for industrial 24 V bus or 85 mA loads | Select only if input ≤6 V and load <50 mA; verify thermal margin with RthJA = 200 °C/W (SOT-25) |
| Analog Devices ADM7172ACPZ-5.0-R7 | Higher performance: 200 mA, 175 mV dropout, but 5.5 V max input and 25 µA IQ - incompatible with 24 V inputs | Targeted at FPGA/ASIC core rails; requires external compensation and larger output caps | Use only in low-VIN, high-PSRR applications where 24 V tolerance is unnecessary and board space permits 10-pin LFCSP |
Compared with XC6219B502MR-G and ADM7172ACPZ-5.0-R7, the LDK715PU50R uniquely balances 24 V input tolerance, 85 mA output, and 5 µA quiescent current in a thermally efficient DFN8 package-making it irreplaceable in wide-input, battery-critical industrial designs.
Availability
LDK715PU50R is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart meter auxiliary rails, and automotive body control modules requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LDK715PU50R 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 chips for industrial, automotive, and consumer markets.
The LDK715 series belongs to ST's high-voltage, ultra-low-IQ LDO product line, engineered specifically for energy-constrained systems operating from unregulated 12–24 V sources in harsh environments.
FAQ
What is the minimum input voltage required for regulation at 5.0 V output?
The LDK715PU50R requires a minimum input voltage of 4.3 V to maintain regulation at 5.0 V output. Below this, the device enters dropout mode and output voltage drops linearly with input. This threshold is specified across the full −40 °C to 125 °C temperature range and at all load currents up to 85 mA.
Can the LDK715PU50R be used with a 0.22 µF ceramic output capacitor?
No. The datasheet specifies a minimum output capacitance of 0.47 µF for stability with ceramic capacitors. Using 0.22 µF violates the stability region defined in Figure 7 and may cause oscillation or poor transient response. Always use ≥0.47 µF X5R/X7R ceramic with ESR <100 mΩ.
Does the LDK715PU50R include an enable pin?
No. The LDK715PU50R has no enable (EN) or shutdown control pin. It operates continuously when input voltage exceeds 4.3 V. For applications requiring controlled power sequencing, an external MOSFET switch or dedicated enable-capable LDO like the LD56100 must be used upstream.
How does thermal performance differ between SOT23-5L and DFN8 3x3 packages?
The DFN8 3x3 package has RthJA = 52 °C/W versus 195 °C/W for SOT23-5L. At 85 mA and 24 V input, power dissipation is ~1.615 W; DFN8 keeps junction temperature rise to ~84 °C above ambient, while SOT23-5L would exceed 314 °C - making DFN8 the only viable choice for full-load operation above 60 °C ambient.
LDK715PU50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 85mA
- Current - Output:
- 85mA
- Current - Quiescent (Iq):
- 7 µA
- Current - Supply (Max):
- 8.5 µA
- PSRR:
- 38dB ~ 57dB (1kHz ~ 100kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LDK715PU50R FAQ
1.How can I place an order for LDK715PU50R through Aetrix?
Please submit a Request for Quotation (RFQ) for LDK715PU50R 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 LDK715PU50R reliable?
The price and inventory of LDK715PU50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDK715PU50R is usually 5 days.
3.What payment methods are accepted for LDK715PU50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDK715PU50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDK715PU50R?
LDK715PU50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDK715PU50R 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 LDK715PU50R?
For technical support, including LDK715PU50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDK715PU50R requirements.
6.How does Aetrix verify that LDK715PU50R is sourced from the original manufacturer or authorized distributors?
All LDK715PU50R 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 LDK715PU50R meets industry standards.
7.What is the process for return or replacement of LDK715PU50R?
All LDK715PU50R units undergo pre-shipment inspection (PSI). If there is an issue with LDK715PU50R, 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 LDK715PU50R part is unused and in its original packaging.
Return procedure for LDK715PU50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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