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STMicroelectronics LD49100PURY
- Part No.:
- LD49100PURY
- Manufacturer:
- STMicroelectronics
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
LD49100PURY.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,335
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Product details
Overview
LD49100PURY 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 30 µVRMS output noise (at 0.8 V) without bypass capacitor - designed for automotive infotainment, ADAS, and telematics power rails.
For engineers reviewing the LD49100PURY datasheet, LD49100PURY pinout, LD49100PURY application, or LD49100PURY equivalent, key selection criteria include its wettable-flank DFN6 package, logic-controlled shutdown (<1 µA off-mode current), Power Good flag with ±7% threshold hysteresis, and stability with 1 µF ceramic output capacitors across -40 °C to 125 °C.
Technical Context
The LD49100PURY implements a precision bandgap reference and error amplifier driving a PMOS pass transistor, enabling ultra-low dropout and high PSRR (70 dB @ 1 kHz). Its internal 1 ms soft-start limits inrush current during enable transitions, while thermal shutdown (160 °C) and constant-current short-circuit protection ensure robust operation under fault conditions.
It supports both fixed-output and adjustable configurations via the ADJ/VSENSE pin: in fixed mode, VSENSE connects directly to VOUT for local or remote sensing; in adjustable mode, a resistor divider sets VOUT = 0.8 V × (1 + R1/R2), enabling outputs from 0.8 V to 4.5 V in 100 mV steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A guaranteed - supports high-current MCU cores, DSPs, and FPGA I/O banks in automotive ECUs. |
| Dropout voltage | 200 mV typ. at 1 A - enables regulation from 1.5 V input down to 0.8 V output, critical for low-voltage SoC domains. |
| Quiescent current | 20 µA typ. at no load - minimizes standby power in always-on vehicle networks (e.g., CAN wake-up circuits). |
| Noise (10 Hz–100 kHz) | 30 µVRMS at 0.8 V - eliminates need for external noise-reduction capacitors in sensitive analog/RF supply domains. |
| Power Good accuracy | 93–99% of actual VOUT rising threshold - enables precise power sequencing for multi-rail processors without external monitoring. |
| Input voltage range | 1.5 V to 5.5 V - accommodates wide battery transients (e.g., cold-crank 4.5 V, load-dump 5.5 V) and post-regulated supplies. |
| Thermal shutdown | 160 °C with 20 °C hysteresis - provides fail-safe thermal management without external circuitry in confined ECU enclosures. |
Pinout & Package
LD49100PURY uses a 6-pin DFN6 (3 mm × 3 mm) package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes. The exposed thermal pad must be connected to PCB ground for optimal thermal performance (RthJA = 55 °C/W on 4-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Active-high logic interface: ≥0.9 V turns regulator on; ≤0.4 V forces shutdown with <1 µA total current draw. |
| GND (Pin 2) | Power and signal ground | Common return path for all internal circuits; must be tied to exposed thermal pad for thermal and electrical integrity. |
| PG (Pin 3) | Open-drain Power Good flag | Signals valid regulation: high-impedance when VOUT ≥93% nominal; pulled low externally via 100 kΩ–1 MΩ resistor to VIN/VOUT. |
| VOUT (Pin 4) | Regulated output | Delivers stable DC voltage; requires ≥1 µF ceramic capacitor placed adjacent to pin for loop stability and transient response. |
| ADJ/VSENSE (Pin 5) | Adjust/sense node | Configurable: as ADJ for resistor-divider feedback (adjustable version) or as VSENSE for remote voltage sensing (fixed version). |
| VIN (Pin 6) | Input supply | Accepts 1.5–5.5 V; requires ≥1 µF low-ESR ceramic capacitor near pin to suppress source impedance and ripple. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from -40 °C to +125 °C ambient, meeting stringent reliability and lifetime requirements. |
| Wettable flank DFN6 package | Enables automated AOI of solder joints - critical for zero-defect manufacturing in safety-critical automotive systems. |
| Logic-controlled shutdown | Reduces system standby current to <1 µA, supporting ISO 26262 ASIL-B compliant low-power sleep modes. |
| Internal 1 ms soft-start | Prevents input voltage sag and output overshoot during power-up, eliminating need for external timing components. |
| Stable with 1 µF ceramic COUT | Eliminates bulk tantalum or electrolytic capacitors - reduces BOM cost, footprint, and failure risk in high-vibration environments. |
Applications
| Infotainment Power Rail | ADAS Camera Module |
|---|---|
|
Use Scenario: Supplies 1.2 V core voltage to application processor in head-unit with dynamic load steps up to 800 mA. IC Role / Device Role / Timing Role: Primary LDO for noise-sensitive digital domain, providing clean, sequenced power with PG confirmation before boot. Use Value: 30 µVRMS noise ensures bit-error-free DDR3/DDR4 memory operation; 200 mV dropout maintains regulation during 12 V battery dip to 9 V. |
Use Scenario: Powers image sensor and ISP in 77 GHz radar camera module requiring sub-100 µV ripple. IC Role / Device Role / Timing Role: Low-noise post-regulator for analog front-end, enabled only after main 3.3 V rail stabilizes via PG chaining. Use Value: No-bypass-capacitor noise performance avoids EMI from capacitor microphonics; wettable flanks ensure solder joint integrity under thermal cycling. |
| Telematics LTE Modem | Body Control Unit (BCU) |
|
Use Scenario: Delivers 1.8 V to LTE baseband IC with burst current demands up to 1 A during data transmission. IC Role / Device Role / Timing Role: High-current LDO with fast load transient response, coordinated via EN/PG with modem's power management controller. Use Value: 40 mVpp transient load regulation prevents brown-out resets; 1 µA shutdown current extends battery life in parked-state tracking. |
Use Scenario: Provides 5.0 V auxiliary rail for LIN transceivers and door module sensors in always-on vehicle network. IC Role / Device Role / Timing Role: Always-on LDO with ultra-low IQ, monitored by microcontroller via PG for fault detection and diagnostics. Use Value: 20 µA no-load current meets UNECE R100 Class 3 leakage limits; AEC-Q100 qualification ensures 15-year field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS7B8133QDGNRQ1 | 3.3 V fixed output; 300 mV dropout at 1 A; 25 µA IQ; no PG pin | Lacks Power Good flag and adjustable option; limited to 3.3 V output | Select when PG signaling is unnecessary and fixed 3.3 V simplifies design. |
| ON Semiconductor NCP115ASN330T2G | 3.3 V fixed; 250 mV dropout; 35 µA IQ; SOT-23-5 package | Smaller package but higher thermal resistance (RthJA ≈ 200 °C/W); no wettable flanks or AEC-Q100 Grade 1 | Choose for space-constrained non-safety-critical modules where automotive qualification is not required. |
Compared with TPS7B8133QDGNRQ1 and NCP115ASN330T2G, LD49100PURY uniquely combines AEC-Q100 Grade 1, wettable flanks, adjustable/fixed flexibility, and integrated PG - making it the only option qualified for ASIL-B power sequencing in ADAS and infotainment domains.
Availability
LD49100PURY is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LD49100PURY 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 over 40 years of analog IC innovation and AEC-Q100-compliant product development.
The LD49100 belongs to ST's automotive-grade LDO portfolio, engineered specifically for low-noise, low-IQ, and high-reliability power delivery in safety-critical vehicle subsystems.
FAQ
What is the minimum output capacitance required for stability?
The LD49100PURY is stable with a minimum 1 µF ceramic capacitor (X5R/X7R) on the output, provided its ESR remains between 0 and 150 mΩ across temperature and bias. Larger values improve transient response but are not required for loop stability.
Can the LD49100PURY be used in adjustable mode with remote sensing?
Yes - in adjustable configuration, the ADJ pin forms a feedback divider with R1 and R2; connecting the VSENSE node (Pin 5) directly to the load point enables true remote sensing, compensating for PCB trace IR drop and maintaining tight output regulation at the point-of-load.
How does the Power Good (PG) pin behave during thermal shutdown?
During thermal shutdown, the PG pin remains in high-impedance state as long as the output voltage stays within the 91–99% VOUT window. If VOUT collapses below VPG_OFF (91% nominal), PG pulls low. Upon recovery, PG returns to high-Z only after VOUT exceeds VPG_ON (93% nominal).
Is the EN pin internally pulled up or down?
No - the EN pin has no internal pull-up or pull-down. It must be actively driven to ≥0.9 V for enable or ≤0.4 V for disable; leaving it floating may cause unpredictable operation due to noise susceptibility and undefined logic state.
LD49100PURY 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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 4.5V
- Voltage Dropout (Max):
- 0.4V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- 70dB ~ 65dB (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)
LD49100PURY FAQ
1.How can I place an order for LD49100PURY through Aetrix?
Please submit a Request for Quotation (RFQ) for LD49100PURY 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 LD49100PURY reliable?
The price and inventory of LD49100PURY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD49100PURY is usually 5 days.
3.What payment methods are accepted for LD49100PURY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD49100PURY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD49100PURY?
LD49100PURY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD49100PURY 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 LD49100PURY?
For technical support, including LD49100PURY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD49100PURY requirements.
6.How does Aetrix verify that LD49100PURY is sourced from the original manufacturer or authorized distributors?
All LD49100PURY 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 LD49100PURY meets industry standards.
7.What is the process for return or replacement of LD49100PURY?
All LD49100PURY units undergo pre-shipment inspection (PSI). If there is an issue with LD49100PURY, 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 LD49100PURY part is unused and in its original packaging.
Return procedure for LD49100PURY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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