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STMicroelectronics LD49100PU18RY
- Part No.:
- LD49100PU18RY
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
LD49100PU18RY.pdf
- Description:
- IC REG LINEAR 1.8V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,537
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Product details
Overview
LD49100PU18RY 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, ±2.0% output voltage tolerance at 25 °C, and integrated Power Good and enable functions - designed for automotive power rails in infotainment, ADAS, and telematics systems.
For engineers reviewing the LD49100PU18RY datasheet, LD49100PU18RY pinout, LD49100PU18RY application, or LD49100PU18RY equivalent, key selection criteria include its wettable-flank DFN6 (3×3 mm) package, -40 °C to 125 °C operating range, 1.5–5.5 V input support, low-noise operation without bypass capacitor (30 µVRMS), and logic-controlled shutdown with <1 µA off-mode current.
Technical Context
The LD49100PU18RY implements a precision bandgap reference-based error amplifier driving a PMOS pass element, enabling ultra-low dropout and stable regulation across temperature and load. Its internal 1 ms soft-start circuit limits inrush current, while thermal shutdown (160 °C) and constant-current short-circuit protection ensure robust fault handling.
It features dual-mode Power Good monitoring - rising threshold at 93–99% of actual VOUT and falling threshold at 91–95% - with open-drain PG output requiring external pull-up. The EN pin accepts TTL-compatible logic levels (VIH ≥ 0.9 V, VIL ≤ 0.4 V) and has negligible input current (≤100 nA), supporting low-power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A guaranteed - supports high-current MCU cores, DSPs, and sensor clusters without external boost. |
| Dropout Voltage | 200 mV typ. at 1 A - enables regulation from 1.8 V input to 1.6 V output, critical for battery-supplied automotive modules. |
| Quiescent Current | 20 µA typ. at no load - minimizes standby power loss in always-on vehicle networks (e.g., CAN wake-up circuits). |
| Noise (RMS) | 30 µVRMS (10 Hz–100 kHz, VOUT = 0.8 V) - eliminates need for noise-reduction bypass capacitor, saving board space. |
| PSRR | 70 dB at 1 kHz - suppresses ripple from noisy switching supplies feeding downstream analog/RF subsystems. |
| Power Good Accuracy | ±2% window (91–99% of actual VOUT) - enables precise rail monitoring for safe microcontroller reset and power sequencing. |
| Operating Temp | -40 °C to 125 °C junction - certified for under-hood and dashboard-mounted automotive electronics. |
Pinout & Package
LD49100PU18RY uses a 6-pin DFN6 (3×3 mm) package with wettable flanks for automated optical solder-joint inspection. Exposed thermal pad must be connected to PCB ground plane for thermal performance (RthJA = 55 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | TTL-compatible logic interface; <0.4 V disables regulator, <1 µA off-mode current, no internal pull-up - requires external bias if unused. |
| GND (Pin 2) | Power and signal ground | Common return for all internal circuits; exposed pad must be soldered to GND plane for thermal and electrical integrity. |
| PG (Pin 3) | Open-drain Power Good flag | Signals valid output (high-Z) or fault/undervoltage (low-Z); requires 100 kΩ–1 MΩ pull-up to VIN or VOUT. |
| VOUT (Pin 4) | Regulated output | Delivers fixed 1.8 V (PU18RY suffix); stable with ≥1 µF ceramic capacitor; supports remote sensing via VSENSE pin. |
| VSENSE (Pin 5) | Output voltage sense input | Connects directly to VOUT for local regulation or to load point for remote sensing - improves accuracy under PCB trace IR drop. |
| VIN (Pin 6) | Input supply | Accepts 1.5–5.5 V DC; requires ≥1 µF low-ESR ceramic capacitor placed adjacent to pin for stability and ripple rejection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use up to 125 °C ambient, including HTOL, TC, and ESD testing per stress requirements. |
| Wettable flank DFN6 package | Enables AOI-compatible solder-joint inspection on production lines, improving yield and reliability in automotive manufacturing. |
| Logic-controlled shutdown | EN pin reduces total current to <1 µA, enabling deep-sleep modes in telematics gateways and domain controllers. |
| Internal soft-start (1 ms) | Prevents output overshoot and inrush current spikes during power-up, eliminating need for external RC timing networks. |
| Stable with 1 µF ceramic COUT | Reduces BOM count and board area vs. legacy LDOs requiring ≥10 µF tantalum or aluminum electrolytic capacitors. |
Applications
| Infotainment Power Rail | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers SoC I/O banks and display interface circuitry in head-unit systems with wide input voltage variation (e.g., cold-crank 6 V to run-stop 13.5 V). IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, sequenced 1.8 V to FPGA configuration banks and MIPI D-PHY receivers. Use Value: Ultra-low noise (30 µVRMS) prevents bit errors in high-speed serial links; Power Good enables safe boot sequence coordination with main SoC. |
Use Scenario: Supplies image signal processor (ISP) core voltage in rear-view or surround-view camera ECUs operating in engine bay environments. IC Role / Device Role / Timing Role: Low-quiescent-current LDO providing 1.8 V under continuous 24/7 operation, with thermal shutdown protecting against enclosure overheating. Use Value: 20 µA no-load IQ extends battery backup runtime during vehicle sleep; -40 °C to 125 °C rating ensures startup reliability after hot soak. |
| Telematics Control Unit | Body Control Module (BCM) Subsystem |
|
Use Scenario: Regulates power to LTE modem baseband processor and GNSS RF front-end in cellular-connected TCU modules. IC Role / Device Role / Timing Role: Secondary LDO decoupling noisy DC-DC outputs, with EN pin synchronized to modem sleep/wake signals. Use Value: 70 dB PSRR at 1 kHz attenuates switching noise from primary buck converter, preserving GNSS sensitivity and LTE Rx SNR. |
Use Scenario: Provides isolated 1.8 V rail for LIN transceiver logic and EEPROM interface in door module or seat controller. IC Role / Device Role / Timing Role: Always-on LDO maintaining memory retention and wake-on-LIN functionality during vehicle sleep cycles. Use Value: <1 µA off-mode current meets ISO 19453-3 leakage limits for Class 3 sleep mode; wettable flanks ensure solder joint reliability in vibration-prone locations. |
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 TPS7B8133QDGNRQ1 | Fixed 3.3 V output; higher IQ (45 µA typ.); 180 mV dropout at 1 A; no Power Good pin. | Lacks rail monitoring capability; unsuitable where system-level power sequencing or fault reporting is required. | Select only when 3.3 V output and absence of PG are acceptable; not drop-in for 1.8 V or PG-dependent designs. |
| ON Semiconductor NCP115AMX180TBG | 1.8 V fixed; 250 mV dropout at 1 A; 35 µA IQ; no soft-start or thermal shutdown; SOT-23-5 package. | Smaller footprint but lacks automotive thermal protection and inrush control; not AEC-Q100 qualified. | Use only in non-automotive or non-safety-critical consumer-grade applications; not suitable for ADAS or infotainment. |
Compared with TPS7B8133QDGNRQ1 and NCP115AMX180TBG, LD49100PU18RY uniquely combines AEC-Q100 Grade 1 qualification, integrated Power Good, 1 ms soft-start, and wettable-flank packaging - making it the only choice for safety-aware automotive subsystems requiring verified reliability, precise sequencing, and production-line inspectability.
Availability
LD49100PU18RY is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 compliance and long-term lifecycle support.
Supply support for LD49100PU18RY 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 over 30 years of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The LD49100 belongs to ST's automotive-grade LDO portfolio, engineered specifically for demanding power-rail applications in ADAS, body electronics, and infotainment - emphasizing low noise, ultra-low IQ, and robust fault protection.
FAQ
What is the output voltage tolerance of LD49100PU18RY over temperature?
The LD49100PU18RY maintains ±3.0% output voltage tolerance across the full -40 °C to 125 °C operating junction temperature range, with ±2.0% specified at 25 °C. This is confirmed in Table 6 of DS13115 Rev 4, measured under 10 mA load with VIN = VOUT(NOM) + 1 V.
Can LD49100PU18RY operate with a 1.2 V input supply?
No. LD49100PU18RY requires a minimum input voltage of 1.5 V per absolute maximum ratings (Table 2) and electrical characteristics (Tables 5–6). At 1.8 V output, the 200 mV typical dropout means VIN must be ≥2.0 V for regulation - 1.2 V is below operational specification and will cause dropout or shutdown.
Is an external capacitor required on the VSENSE pin?
No external capacitor is required on VSENSE (Pin 5). It is a high-impedance sensing node that must be connected either directly to VOUT (Pin 4) for local regulation or to the load point for remote sensing. Floating VSENSE is prohibited and causes regulation failure per datasheet Section 6.2.
Does LD49100PU18RY support adjustable output voltages?
No. LD49100PU18RY is the fixed 1.8 V output variant (denoted by "PU18RY" suffix). Adjustable versions use "PUxxRY" with different suffixes (e.g., PUADJRY) and feature an ADJ pin instead of VSENSE. Pin function and internal feedback network differ - they are not interchangeable.
LD49100PU18RY 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):
- 1.8V
- 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)
LD49100PU18RY FAQ
1.How can I place an order for LD49100PU18RY through Aetrix?
Please submit a Request for Quotation (RFQ) for LD49100PU18RY 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 LD49100PU18RY reliable?
The price and inventory of LD49100PU18RY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD49100PU18RY is usually 5 days.
3.What payment methods are accepted for LD49100PU18RY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD49100PU18RY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD49100PU18RY?
LD49100PU18RY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD49100PU18RY 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 LD49100PU18RY?
For technical support, including LD49100PU18RY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD49100PU18RY requirements.
6.How does Aetrix verify that LD49100PU18RY is sourced from the original manufacturer or authorized distributors?
All LD49100PU18RY 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 LD49100PU18RY meets industry standards.
7.What is the process for return or replacement of LD49100PU18RY?
All LD49100PU18RY units undergo pre-shipment inspection (PSI). If there is an issue with LD49100PU18RY, 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 LD49100PU18RY part is unused and in its original packaging.
Return procedure for LD49100PU18RY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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