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STMicroelectronics LD49100PU15RY
- Part No.:
- LD49100PU15RY
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
LD49100PU15RY.pdf
- Description:
- 1 A, LOW QUIESCENT CURRENT, LOW-
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
LD49100PU15RY from STMicroelectronics is an AEC-Q100 Grade 1 qualified ultra-low-dropout linear regulator delivering 1 A output current with 200 mV typical dropout at full load, 20 µA quiescent current at no load, and ±2.0% output voltage accuracy at 25 °C. It operates from 1.5 V to 5.5 V input and provides fixed 1.5 V output in a DFN6 (3×3 mm) wettable flanks package, targeting automotive power rails for infotainment, ADAS, and telematics.
For engineers reviewing the LD49100PU15RY datasheet, LD49100PU15RY pinout, LD49100PU15RY application, or LD49100PU15RY equivalent, key selection criteria include its automotive-grade thermal shutdown (160 °C), Power Good open-drain flag, logic-controlled enable, soft-start (1 ms), and stability with 1 µF ceramic output capacitors - all critical for safety-critical 12 V system post-regulation.
Technical Context
The LD49100PU15RY implements a PMOS pass transistor architecture enabling ultra-low dropout and near-zero reverse current during shutdown. Its internal bandgap reference feeds a precision error amplifier that regulates output via feedback from the VSENSE pin (Pin 5), supporting remote sensing in fixed-output configurations.
It integrates dual protection: constant-current short-circuit limiting (2.5 A typ.) and thermal shutdown with 20 °C hysteresis. The Power Good circuit monitors actual output voltage (not nominal), asserting high-impedance above 93% VOUT and sinking up to 6 mA when below 91% VOUT - enabling robust power sequencing in multi-rail automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±2.0% at 25 °C; supports stable regulation down to 1.5 V input–output differential |
| Dropout Voltage | 200 mV typ. at 1 A load; enables operation with minimal headroom in 3.3 V → 1.5 V or 2.5 V → 1.5 V conversion |
| Quiescent Current | 20 µA typ. at no load; ensures <1 µA total shutdown current when EN = GND - critical for always-on automotive modules |
| Power Good Threshold | Rising threshold at 93% of actual VOUT; allows accurate rail monitoring independent of process/temp drift |
| Soft-Start Time | 1 ms typ. to 95% VOUT; limits inrush current during cold cranking or wake-up events |
| Thermal Shutdown | 160 °C junction temperature with 20 °C hysteresis; prevents latch-up during sustained overload in sealed enclosures |
| Output Noise | 85 µVRMS (10 Hz–100 kHz) at VOUT = 2.5 V; low-noise performance maintained without bypass capacitor |
Pinout & Package
LD49100PU15RY uses a 6-pin DFN6 (3×3 mm) package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes. The exposed pad must be connected to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Active-high logic interface; device enabled when ≥0.9 V, disabled when ≤0.4 V; no internal pull-up - requires external bias if unused |
| GND (Pin 2) | Power and signal ground | Common return for IN, OUT, PG, and EN; connects to exposed thermal pad for optimal heat dissipation |
| PG (Pin 3) | Open-drain Power Good flag | High-impedance when VOUT ≥93% of actual value; sinks up to 6 mA when VOUT ≤91%; requires external 100 kΩ–1 MΩ pull-up |
| VOUT (Pin 4) | Regulated output terminal | Delivers 1.5 V ±2.0% at up to 1 A; connects directly to load or remote sense point via VSENSE |
| VSENSE (Pin 5) | Output voltage sensing input | Monitors actual VOUT for regulation accuracy and PG generation; must be tied to VOUT (Pin 4) or routed to load for remote sensing |
| VIN (Pin 6) | Input supply connection | Accepts 1.5–5.5 V DC; requires ≥1 µF low-ESR ceramic capacitor placed adjacent to this pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40 °C to +125 °C ambient operation - meets functional safety requirements for front-end ADAS and cluster systems |
| Wettable flanks DFN6 package | Enables automated AOI of solder joints on bottom-side pins - essential for zero-defect automotive manufacturing |
| Stable with 1 µF ceramic COUT | Eliminates need for large tantalum or aluminum electrolytics; reduces board area and improves long-term reliability |
| Logic-controlled shutdown | Reduces total system standby current to <1 µA - extends battery life in parked vehicle scenarios |
| Internal current & thermal limiting | Prevents damage during short-circuit or overtemperature events without requiring external foldback circuitry |
Applications
| Infotainment Power Rail | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Stable 1.5 V core supply for SoC I/O or DDR termination in head-unit mainboards. IC Role / Device Role / Timing Role: Post-regulator converting 3.3 V domain to noise-sensitive 1.5 V logic rail with precise sequencing via PG signal. Use Value: 85 µVRMS output noise and 70 dB PSRR at 1 kHz ensure clean power for high-speed digital interfaces without added filtering. |
Use Scenario: Primary 1.5 V supply for image signal processor (ISP) in surround-view camera ECU. IC Role / Device Role / Timing Role: Low-quiescent LDO providing always-on bias during vehicle sleep mode, enabled only during active imaging. Use Value: 20 µA no-load IQ and <1 µA shutdown current minimize parasitic drain on 12 V battery during extended parking. |
| Telematics LTE Modem Core | Body Control Module Sensor Interface |
|
Use Scenario: Dedicated 1.5 V rail for LTE baseband processor core voltage in telematics control unit (TCU). IC Role / Device Role / Timing Role: Regulator with soft-start and PG flag enabling safe power-up sequence before modem firmware initialization. Use Value: 1 ms soft-start prevents bus droop during modem wake-up; PG signal confirms valid rail before host MCU releases reset. |
Use Scenario: Precision 1.5 V reference for analog sensor signal conditioning (e.g., HVAC cabin temp sensor ADC). IC Role / Device Role / Timing Role: Low-noise, high-accuracy LDO supplying ADC reference and op-amp bias in body electronics node. Use Value: ±2.0% output tolerance and 0.001 %/mA load regulation ensure consistent measurement accuracy across temperature and load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-dropout automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS7B8133QDCYRQ1 | Fixed 3.3 V output; higher IQ (45 µA typ.); 300 mV dropout at 1 A | Not suitable for 1.5 V rail; requires redesign of downstream logic voltage levels | Select only if system requires 3.3 V and higher PSRR (75 dB @ 1 kHz) is prioritized over dropout |
| ON Semiconductor NCP115AMX150TBG | Fixed 1.5 V; AEC-Q100 Grade 2; 350 mV dropout at 1 A; no PG or soft-start | Lacks power sequencing capability; limited to non-safety-critical body electronics | Acceptable for cost-sensitive interior lighting modules where PG and soft-start are not required |
Compared with TPS7B8133QDCYRQ1 and NCP115AMX150TBG, LD49100PU15RY uniquely combines 1.5 V fixed output, 200 mV dropout, integrated PG/soft-start, and Grade 1 qualification - making it the only drop-in solution for ASIL-B compliant 1.5 V domains requiring both low IQ and precise rail monitoring.
Availability
LD49100PU15RY is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics TCUs requiring stable component supply under AEC-Q100 compliance and extended temperature operation.
Supply support for LD49100PU15RY 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 specializing in automotive, industrial, and power management ICs, with R&D and manufacturing facilities across Europe, Asia, and the Americas.
The LD49100 belongs to ST's automotive-grade LDO portfolio designed specifically for demanding power rails in ADAS, infotainment, and body electronics - emphasizing ultra-low dropout, low noise, and functional safety readiness.
FAQ
What is the minimum input voltage required for LD49100PU15RY to regulate 1.5 V output?
The LD49100PU15RY requires VIN ≥ VOUT + VDROP. With 200 mV typical dropout at 1 A, minimum input is 1.7 V. Absolute minimum operating VIN is 1.5 V per datasheet, but regulation is only guaranteed above dropout margin - design margin should include worst-case 400 mV dropout at high temperature and full load.
Can LD49100PU15RY be used without an external pull-up resistor on the PG pin?
No. The PG pin is open-drain and requires an external pull-up resistor (100 kΩ to 1 MΩ) to either VIN or VOUT to generate a valid logic-high signal. Leaving PG floating results in undefined behavior and violates the functional specification - the datasheet explicitly states PG must be pulled up if used, and left floating only if unused.
Does the LD49100PU15RY support remote voltage sensing?
Yes. Pin 5 (VSENSE) is dedicated to remote sensing in the fixed-output version. It must be connected either directly to VOUT (Pin 4) for local regulation or routed to the load's power plane to compensate for PCB trace IR drop - enabling tighter regulation at the point-of-load under dynamic current conditions.
Is the DFN6 (3×3 mm) wettable flanks package compatible with standard reflow profiles?
Yes. The LD49100PU15RY's DFN6 package is qualified for lead-free reflow per JEDEC J-STD-020. Wettable flanks do not alter thermal profile requirements but enable post-reflow AOI verification of solder fillet formation - no special stencil or reflow adjustments are needed beyond standard automotive-grade process controls.
LD49100PU15RY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-VDFN 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):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- 65dB ~ 62dB (1kHz ~ 10kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 6-DFN (3x3)
LD49100PU15RY FAQ
1.How can I place an order for LD49100PU15RY through Aetrix?
Please submit a Request for Quotation (RFQ) for LD49100PU15RY 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 LD49100PU15RY reliable?
The price and inventory of LD49100PU15RY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD49100PU15RY is usually 5 days.
3.What payment methods are accepted for LD49100PU15RY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD49100PU15RY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD49100PU15RY?
LD49100PU15RY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD49100PU15RY 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 LD49100PU15RY?
For technical support, including LD49100PU15RY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD49100PU15RY requirements.
6.How does Aetrix verify that LD49100PU15RY is sourced from the original manufacturer or authorized distributors?
All LD49100PU15RY 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 LD49100PU15RY meets industry standards.
7.What is the process for return or replacement of LD49100PU15RY?
All LD49100PU15RY units undergo pre-shipment inspection (PSI). If there is an issue with LD49100PU15RY, 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 LD49100PU15RY part is unused and in its original packaging.
Return procedure for LD49100PU15RY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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