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STMicroelectronics LD49100PU12RY
- Part No.:
- LD49100PU12RY
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
LD49100PU12RY.pdf
- Description:
- IC REG LINEAR 1.2V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,743
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Product details
Overview
LD49100PU12RY 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 a fixed 1.2 V output in a DFN6 (3×3 mm) wettable flanks package for automotive infotainment and ADAS power rails.
For engineers reviewing the LD49100PU12RY datasheet, LD49100PU12RY pinout, LD49100PU12RY application, or LD49100PU12RY equivalent, key selection criteria include its 1.2 V fixed output, Power Good monitoring capability, logic-controlled enable, thermal shutdown at 160 °C, and stability with 1 µF ceramic output capacitors - all validated for -40 °C to 125 °C operation.
Technical Context
The LD49100PU12RY implements a precision bandgap reference-based error amplifier driving a PMOS pass transistor, enabling ultra-low dropout and high PSRR (70 dB @ 1 kHz). Its internal 1 ms soft-start circuit limits inrush current during enable transitions, while the open-drain Power Good output monitors regulated output within ±7% of nominal VOUT (93–99% rising threshold).
It integrates overcurrent limiting (2.5 A short-circuit current), thermal shutdown with 20 °C hysteresis, and logic-level enable control (0.4 V low / 0.9 V high thresholds). The device is stable with 1 µF X5R/X7R ceramic capacitors on both input and output, eliminating need for bypass capacitors to achieve 30 µVRMS noise at 0.8 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±2.0% at 25 °C; supports automotive core logic and I/O supply domains requiring tight regulation. |
| Dropout Voltage | 200 mV typ. at 1 A load; enables operation with VIN as low as 1.4 V while maintaining regulation - critical for battery-supplied systems. |
| Quiescent Current | 20 µA typ. at no load; ensures <1 µA shutdown current, extending battery life in always-on vehicle modules. |
| Power Good Accuracy | PG threshold = 93–99% of actual VOUT; provides reliable sequencing and fault detection without external comparators. |
| Noise Performance | 30 µVRMS (10 Hz–100 kHz) at VOUT = 0.8 V; meets low-noise requirements for analog sensors and RF subsystems without bypass cap. |
| Thermal Protection | 160 °C shutdown with 20 °C hysteresis; prevents permanent damage during sustained overload or poor PCB thermal design. |
| Input Voltage Range | 1.5 V to 5.5 V; compatible with 3.3 V, 2.5 V, and 1.8 V system rails and wide-range automotive battery inputs. |
Pinout & Package
LD49100PU12RY is housed in a 6-pin DFN6 (3×3 mm) package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive applications. The exposed thermal pad must be connected to GND for optimal thermal performance (RthJA = 55 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Active-high logic control: ≥0.9 V enables regulator; ≤0.4 V disables it with <1 µA total current draw. |
| 2 - GND | Ground reference | Common return path for all internal circuits and thermal pad connection point. |
| 3 - PG | Power Good open-drain output | Asserts high-impedance when VOUT ≥93% of nominal; requires external 100 kΩ–1 MΩ pull-up to VIN or VOUT. |
| 4 - VOUT | Regulated output | Delivers fixed 1.2 V at up to 1 A; connects directly to load or remote sensing point. |
| 5 - VSENSE | Output voltage sense | Internally tied to VOUT in fixed versions; enables remote sensing if routed to load side to compensate PCB drop. |
| 6 - VIN | Input supply | Accepts 1.5–5.5 V; requires ≥1 µF low-ESR ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across -40 °C to +125 °C ambient, meeting stringent reliability and lifetime requirements. |
| Wettable flanks DFN6 package | Enables automated AOI of solder joints - essential for zero-defect manufacturing in safety-critical vehicle systems. |
| 1 µF ceramic capacitor stability | Eliminates need for large tantalum or electrolytic capacitors, reducing BOM cost, board area, and failure risk. |
| Internal 1 ms soft-start | Prevents input rail collapse and downstream reset glitches during power-up in multi-rail systems. |
| Low-noise operation without bypass cap | 30 µVRMS noise at 0.8 V output enables direct powering of noise-sensitive analog/RF ICs without extra filtering. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
Use Scenario: Providing clean, sequenced 1.2 V core supply to SoCs and DSPs in head-unit and digital cluster systems. IC Role / Device Role / Timing Role: Primary LDO for processor core rail with Power Good signaling for safe boot sequence coordination. Use Value: ±2.0% output accuracy and 70 dB PSRR ensure stable core voltage under varying battery conditions and EMI-rich cabin environments. | Use Scenario: Regulating 1.2 V for image signal processors (ISPs) and high-speed SerDes interfaces in surround-view cameras. IC Role / Device Role / Timing Role: Low-noise, low-dropout post-regulator delivering stable core voltage independent of main DC-DC ripple. Use Value: 30 µVRMS noise and 1 µF ceramic stability eliminate need for bulky filtering, enabling compact camera module designs. |
| Telematics Control Unit | Body Control Module |
Use Scenario: Supplying always-on 1.2 V to MCU and cellular modem subsystems requiring ultra-low quiescent current. IC Role / Device Role / Timing Role: Always-on LDO with logic-controlled shutdown and <1 µA off-mode current for battery backup operation. Use Value: 20 µA no-load IQ extends telematics battery runtime during vehicle sleep cycles without compromising wake-up responsiveness. | Use Scenario: Powering 1.2 V microcontroller peripherals and CAN transceiver I/O in door modules and lighting controllers. IC Role / Device Role / Timing Role: Robust local regulator with thermal and short-circuit protection for harsh under-hood and chassis environments. Use Value: 160 °C thermal shutdown and 2.5 A current limit prevent field failures due to wiring faults or connector shorts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, automotive-grade LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLD1112-12B | Fixed 1.2 V, 1.2 A, 250 mV dropout, 35 µA IQ, no PG output | Lacks Power Good flag and remote sensing; simpler enable-only control | Select when sequencing is handled externally and PG monitoring is unnecessary. |
| NCP1117ST12T3G | Fixed 1.2 V, 1 A, 1.2 V dropout, 6 mA IQ, TO-220/SOT-223 package | Higher dropout and IQ; not AEC-Q100 qualified; lacks soft-start and PG | Use only in non-automotive industrial applications where thermal margin and qualification are not required. |
Compared with TLD1112-12B and NCP1117ST12T3G, LD49100PU12RY uniquely combines AEC-Q100 Grade 1 qualification, wettable flanks packaging, Power Good signaling, and sub-1 µA shutdown current - making it the only choice for safety-critical automotive LDO applications demanding full functional monitoring and zero-defect assembly.
Availability
LD49100PU12RY is available at Aetrix Electronics and suitable for infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply with full automotive qualification and traceable sourcing.
Supply support for LD49100PU12RY 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 solutions, with decades of experience in high-reliability analog IC design.
The LD49100 belongs to ST's automotive-grade LDO family engineered specifically for low-noise, low-quiescent-current power delivery in safety-critical vehicle subsystems - emphasizing AEC-Q100 compliance, thermal robustness, and functional monitoring.
FAQ
What is the minimum input voltage required for LD49100PU12RY to maintain 1.2 V output at 1 A?
The minimum input voltage is 1.4 V, calculated as VOUT + VDROP = 1.2 V + 200 mV. At temperatures beyond 25 °C or under worst-case process variation, dropout may reach 400 mV, requiring VIN ≥1.6 V for guaranteed regulation at full load across the full -40 °C to 125 °C range.
Can LD49100PU12RY operate 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; if unused, it must remain unconnected per datasheet guidance.
Is the VSENSE pin on LD49100PU12RY internally connected to VOUT?
Yes - in the fixed-output LD49100PU12RY variant, Pin 5 (VSENSE) is internally tied to Pin 4 (VOUT). For standard operation, connect VSENSE directly to VOUT; for remote sensing, route it to the load-side of the output trace to compensate for PCB IR drop.
Does LD49100PU12RY require a bypass capacitor to achieve its specified 30 µVRMS noise performance?
No - the 30 µVRMS noise specification (at VOUT = 0.8 V) is achieved without any bypass capacitor. This value is measured with only the required 1 µF ceramic output capacitor. Adding a bypass cap does not improve noise and is unnecessary for this device.
LD49100PU12RY 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):
- 1.2V
- 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
- 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)
LD49100PU12RY FAQ
1.How can I place an order for LD49100PU12RY through Aetrix?
Please submit a Request for Quotation (RFQ) for LD49100PU12RY 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 LD49100PU12RY reliable?
The price and inventory of LD49100PU12RY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD49100PU12RY is usually 5 days.
3.What payment methods are accepted for LD49100PU12RY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD49100PU12RY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD49100PU12RY?
LD49100PU12RY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD49100PU12RY 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 LD49100PU12RY?
For technical support, including LD49100PU12RY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD49100PU12RY requirements.
6.How does Aetrix verify that LD49100PU12RY is sourced from the original manufacturer or authorized distributors?
All LD49100PU12RY 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 LD49100PU12RY meets industry standards.
7.What is the process for return or replacement of LD49100PU12RY?
All LD49100PU12RY units undergo pre-shipment inspection (PSI). If there is an issue with LD49100PU12RY, 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 LD49100PU12RY part is unused and in its original packaging.
Return procedure for LD49100PU12RY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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