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STMicroelectronics L5150CSTR
- Part No.:
- L5150CSTR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L5150CSTR.pdf
- Description:
- IC REG LINEAR 5V 150MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
L5150CSTR from STMicroelectronics is an AEC-Q100 qualified automotive-grade 5 V low-dropout linear voltage regulator with integrated power-on reset, adjustable low-voltage reset, and early warning functions. It delivers 150 mA output current, maintains ±2% output voltage accuracy over -40 °C to 150 °C junction temperature, and operates from 5.6 V to 40 V input supply - enabling use in 12 V/24 V vehicle battery systems with cold-crank tolerance.
For engineers reviewing the L5150CSTR datasheet, L5150CSTR pinout, L5150CSTR application, or L5150CSTR equivalent, this device supports critical safety-critical subsystems requiring precise reset timing, early brown-out detection, and stable 5 V rail generation under wide-input, high-temperature conditions typical of engine control units and ADAS domain controllers.
Technical Context
The L5150CSTR integrates a p-channel MOSFET pass element for ultra-low dropout (≤500 mV at 150 mA), enabling regulation down to VS − Vo = 0.5 V. Its internal bandgap reference and on-chip trimming ensure ±2% output voltage accuracy across line (5.6–31 V), load (0.1–150 mA), and temperature (−40 to +150 °C) variations.
Three independent monitoring circuits coexist on-die: a reset generator with externally programmable delay (via capacitor on Vcr pin) and adjustable threshold (via resistor divider on Res_Adj), plus an early warning comparator (EWi/EWo) with hysteresis that signals input voltage degradation before reset activation - supporting predictive power management in automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.0 V ±2% - guarantees logic-level compatibility with 5 V microcontrollers and sensors across full automotive temperature range. |
| Max input voltage | 40 V DC - supports 24 V commercial vehicle systems and withstands ISO 7637-2 pulse 5a (load dump up to 35 V). |
| Dropout voltage | ≤500 mV at 150 mA - enables stable 5 V output even during cold-crank (VS ≥ 5.5 V) without dropout-induced system reset. |
| Quiescent current | 55 µA typical at light load - minimizes standby power loss in always-on ECU modules meeting UNECE R100 Class B requirements. |
| Reset threshold | Adjustable from 3.5 V to 5.0 V via external divider on Res_Adj - allows precise match to host MCU's VDD monitor level. |
| Early warning hysteresis | 70 mV - prevents chatter during slow battery voltage decay, giving firmware time to execute graceful shutdown. |
| Thermal shutdown | 150 °C trip with 10 °C hysteresis - protects against sustained overload or poor PCB heatsinking in confined engine bay layouts. |
| PSRR @ 100 Hz | 48 dB - suppresses alternator ripple and conducted noise, reducing need for additional filtering in sensitive analog domains. |
Pinout & Package
Package: SO-8 (Small Outline Integrated Circuit, 8-pin, surface-mount). Exposed pad not electrically connected; recommended to solder to GND plane for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS (Pin 5) | Input supply rail | Accepts 5.6–40 V DC; requires local 100 µF electrolytic + 100 nF ceramic decoupling directly at pin. |
| Vo (Pin 4) | Regulated 5 V output | Delivers up to 150 mA; stabilized by ≥220 nF ceramic capacitor to GND - no ESR constraints. |
| GND (Pin 3) | Power and signal reference | Common return for all internal circuits; must connect to low-impedance ground plane. |
| Res (Pin 1) | Open-drain reset output | Pulled low when Vo drops below threshold; internal 20 kΩ pull-up to Vo - compatible with 3.3 V/5 V logic inputs. |
| Vcr (Pin 2) | Reset timing capacitor node | Connects external capacitor (e.g., 1000 pF → 4 ms delay); sets reset assertion duration after undervoltage event. |
| Res_Adj (Pin 8) | Reset threshold adjust input | Accepts voltage divider from VS/GND; sets reset point as low as 3.5 V - enables custom brown-out detection. |
| EWi (Pin 6) | Early warning input monitor | Senses scaled VS via external divider; triggers EWo low when input falls below 2.5 V ±70 mV hysteresis. |
| EWo (Pin 7) | Early warning open-drain output | Signals impending reset condition; allows firmware to initiate diagnostics or save state before hard reset. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for operation from −40 °C to +150 °C junction temperature - suitable for under-hood ECU deployment. |
| Programmable reset delay | Capacitor-timed delay (2–11 ms with 100 pF–10 nF) eliminates false resets during transient dips. |
| Very wide stability range | Stable with ≥220 nF ceramic output capacitor - eliminates need for tantalum or aluminum electrolytics. |
| Low quiescent current mode | Auto-switches to 55 µA consumption below ~0.8 mA load - extends battery life in sleep-mode vehicle networks. |
| Integrated thermal & short-circuit protection | Self-shutdown at 150 °C with 10 °C hysteresis and current limiting up to 660 mA - prevents latch-up or damage. |
| Early warning with hysteresis | Dual-threshold comparator (2.50 V/2.57 V) provides clean, chatter-free alert 100–200 ms before reset activation. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Powers 5 V microcontroller, CAN transceiver, and analog sensor interface in gasoline/diesel engine management systems exposed to under-hood temperatures up to 150 °C. IC Role / Device Role / Timing Role: Primary 5 V regulator with synchronized reset generation and early warning for battery voltage sag during cranking or alternator failure. Use Value: Prevents spurious MCU resets during cold-crank (VS dips to 5.5 V) while providing deterministic reset timing and pre-failure alert for diagnostic logging. |
Use Scenario: Supplies vision processor, radar SoC, and camera sensor interfaces in forward collision warning and lane departure systems. IC Role / Device Role / Timing Role: Dual-role power manager: delivers clean 5 V rail and generates fail-safe reset signals aligned with ASIL-B functional safety requirements. Use Value: Enables ISO 26262-compliant safe state entry via adjustable reset threshold and early warning - allowing controlled shutdown before voltage collapse. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Regulates 5 V for door module MCUs, LIN transceivers, and LED drivers in centralized body electronics architecture. IC Role / Device Role / Timing Role: Always-on LDO with ultra-low quiescent current (55 µA) and programmable reset - meets OEM static current budgets (<100 µA). Use Value: Eliminates need for external reset IC and discrete voltage monitor, reducing BOM count and PCB area in space-constrained modules. |
Use Scenario: Powers USB hub controller, display timing controller, and audio codec in automotive infotainment systems with extended temperature operation. IC Role / Device Role / Timing Role: Secondary 5 V regulator with PSRR >48 dB at 100 Hz - suppresses alternator ripple and reduces conducted EMI into sensitive audio paths. Use Value: Maintains clean power for high-resolution displays and low-jitter audio without adding LC filters or ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO with reset and early warning applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST50T3G | Fixed 5 V output, no reset or early warning functions; 1.2 V dropout at 1 A; TO-220/TO-263 package only. | Requires external reset IC (e.g., MAX809) and voltage monitor - increases component count and board area. | Select only if cost-sensitive non-safety designs require higher current (up to 1 A) and can accommodate larger thermal footprint. |
| TLE42754G | 5 V LDO with reset but no early warning; 400 mV dropout at 150 mA; AEC-Q100 Grade 1 (−40 to +125 °C). | Lacks predictive early warning capability - cannot support ASIL-B diagnostic coverage for battery monitoring. | Choose when thermal margin is sufficient for cabin applications but early warning functionality is not required. |
Compared with NCP1117ST50T3G and TLE42754G, the L5150CSTR uniquely integrates reset timing, adjustable threshold, and early warning in a single SO-8 package rated for Grade 0 operation - delivering functional safety readiness, space savings, and design simplification for under-hood automotive systems.
Availability
L5150CSTR is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and infotainment head units requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for L5150CSTR 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, and automotive-grade analog devices.
The L5150CSTR belongs to ST's automotive LDO portfolio engineered specifically for power management in harsh-environment electronic control units - emphasizing AEC-Q100 compliance, wide input range, and integrated system-monitoring features.
FAQ
What is the minimum input voltage required for regulation at full 150 mA load?
The L5150CSTR maintains regulation down to VS = Vo + Vdp = 5.0 V + 0.5 V = 5.5 V at 150 mA, per datasheet Figure 5. This enables reliable operation during automotive cold-crank events where battery voltage may dip to 5.5 V - confirmed by test data across −40 °C to +150 °C junction temperature.
Can the reset threshold be set below 3.5 V?
No. The datasheet explicitly states the adjustable reset threshold ranges "down to 3.5 V" using the Res_Adj pin and external divider (Section 1, Features). Electrical characteristics Table 6 specifies Vres_adj min = 2.35 V, but Vo_th is defined as a percentage of Vo_ref (6–10% below 5 V = 4.5–4.7 V minimum), and the absolute lower limit is constrained by internal comparator design - 3.5 V is the verified functional floor.
Is an external capacitor required on the Vcr pin for basic reset functionality?
No. The Vcr pin may be left open for immediate reset assertion upon undervoltage detection. However, connecting a capacitor (e.g., 1000 pF) introduces a programmable delay (2–11 ms) to prevent false resets during brief transients - a key design choice validated in application schematic Figure 21 and timing diagram Figure 24.
Does the L5150CSTR support reverse-battery protection?
No. The device lacks integrated reverse-polarity protection. Datasheet Section 2.1 Absolute Maximum Ratings specifies Vsdc minimum = −0.3 V, indicating it is not designed to withstand reverse battery connection. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems where reverse-battery fault exposure is possible.
L5150CSTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- 4.2 mA
- PSRR:
- 48dB (100Hz)
- Control Features:
- Reset
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
L5150CSTR FAQ
1.How can I place an order for L5150CSTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L5150CSTR 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 L5150CSTR reliable?
The price and inventory of L5150CSTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5150CSTR is usually 5 days.
3.What payment methods are accepted for L5150CSTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5150CSTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L5150CSTR?
L5150CSTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L5150CSTR 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 L5150CSTR?
For technical support, including L5150CSTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5150CSTR requirements.
6.How does Aetrix verify that L5150CSTR is sourced from the original manufacturer or authorized distributors?
All L5150CSTR 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 L5150CSTR meets industry standards.
7.What is the process for return or replacement of L5150CSTR?
All L5150CSTR units undergo pre-shipment inspection (PSI). If there is an issue with L5150CSTR, 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 L5150CSTR part is unused and in its original packaging.
Return procedure for L5150CSTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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