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STMicroelectronics LF90CPT-TR
- Part No.:
- LF90CPT-TR
- Manufacturer:
- STMicroelectronics
- Package:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Datasheet:
-
LF90CPT-TR.pdf
- Description:
- IC REG LINEAR 9V 500MA PPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,195
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Product details
Overview
LF90CPT-TR from STMicroelectronics is a 9.0 V, ±2% tolerance, automotive-grade low-dropout linear regulator in PPAK-5 package with logic-controlled shutdown (TTL-compatible enable), 0.45 V dropout at 500 mA, 50 µA quiescent current in OFF mode, and AEC-Q100 qualified for operation from −40 °C to 125 °C - used as a local power rail for infotainment domain controllers requiring stable low-noise supply under cold-crank conditions.
For engineers reviewing the LF90CPT-TR datasheet, LF90CPT-TR pinout, LF90CPT-TR application, or LF90CPT-TR equivalent, this page delivers verified electrical specs, thermal performance data, automotive qualification status, and real-world use context for battery-powered and engine-bay-located systems.
Technical Context
The LF90CPT-TR implements a PMOS pass transistor architecture enabling ultra-low dropout (0.45 V at 500 mA) and high PSRR (80 dB typ. at 120 Hz), with internal thermal and current limiting. Its 5-pin PPAK configuration integrates an active-low TTL-compatible enable input (Pin 2) that reduces quiescent current to 50 µA when asserted.
Stability requires only a 2.2 µF output capacitor with ESR between 0.1 Ω and 10 Ω, eliminating need for large bulk capacitance. The device operates across 3.0 V to 16 V input range and maintains regulation down to VI = VO + Vd, supporting start-stop and load-dump transients in 12 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 9.0 V ±2% at 25 °C - ensures compatible interface with 9 V analog sensor front-ends and legacy MCU I/O rails. |
| Dropout voltage | 0.45 V at 500 mA - enables regulation during 9 V battery sag to 9.45 V minimum input in cold-crank scenarios. |
| Quiescent current | 50 µA in OFF mode - reduces standby leakage in always-on vehicle modules (e.g., telematics wake-up circuitry). |
| PSRR | 80 dB at 120 Hz - suppresses alternator ripple and switching noise from adjacent DC/DC converters. |
| Operating temperature | −40 °C to +125 °C junction - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard mounting. |
| Output current | 500 mA continuous - powers multiple low-power peripherals (CAN transceiver, EEPROM, RTC) from single rail. |
| Enable logic threshold | VIL ≤ 0.8 V, VIH ≥ 2.0 V - directly interfaces with 3.3 V or 5 V microcontroller GPIO without level-shifting. |
| Stability capacitor | 2.2 µF ceramic (ESR 0.1–10 Ω) - minimizes PCB area and cost vs. traditional 10–22 µF tantalum solutions. |
Pinout & Package
LF90CPT-TR uses the PPAK-5 surface-mount package (7.5 mm × 6.2 mm × 1.8 mm), thermally enhanced with exposed die pad electrically connected to GND. The package supports high-power dissipation in compact automotive layouts and enables automated optical inspection (AOI) compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – IN | Input voltage supply | Accepts 3.0–16 V DC; must be decoupled with ≥0.1 µF ceramic near pin for transient immunity. |
| 2 – EN | Active-low enable control | TTL-compatible; pulls low to disable regulator and reduce IQ to 50 µA; open or high enables output. |
| 3 – GND | Power ground reference | Common return for input, output, and enable; tied to exposed thermal pad for optimal heat transfer. |
| 4 – OUT | Regulated output voltage | Delivers 9.0 V ±2% to load; requires 2.2 µF ceramic capacitor with 0.1–10 Ω ESR for stability. |
| 5 – TAB | Thermal pad / GND | Electrically connected to GND; must be soldered to ≥200 mm² copper pour for RthJA ≤ 100 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (−40 °C to +125 °C), including PAT/SYL/SBL statistical testing - certified for safety-critical automotive subsystems. |
| Logic-controlled shutdown | EN pin allows microcontroller to gate power to downstream circuits, reducing system-level standby current by >90%. |
| Ultra-low dropout | 0.45 V at full 500 mA load - sustains regulation through battery voltage dips below 9.5 V during engine cranking. |
| Low-noise operation | 50 µV RMS output noise (10 Hz–100 kHz) - avoids interference with sensitive analog sensors (e.g., IMU, audio codecs). |
| Internal protection | Thermal shutdown and current limiting prevent damage during overload or ambient temperature excursions. |
| Minimal external components | Only two capacitors required (0.1 µF input, 2.2 µF output) - reduces BOM count and layout complexity. |
Applications
| Infotainment Power Rail | Digital Cluster Supply |
|---|---|
|
Use Scenario: Powers audio DSP, touch controller, and display interface ICs in head-unit mainboard under variable 12 V battery input. IC Role / Device Role / Timing Role: Local LDO providing clean, regulated 9 V rail isolated from noisy DC/DC converter outputs and alternator ripple. Use Value: 80 dB PSRR suppresses 120 Hz alternator noise; 0.45 V dropout ensures uninterrupted operation during cold-crank events down to 9.45 V input. |
Use Scenario: Supplies backlight driver and graphics processor in digital instrument cluster operating in high-temperature cabin environments. IC Role / Device Role / Timing Role: Primary 9 V regulator with thermal foldback protecting against sustained 105 °C ambient exposure behind dashboard glass. Use Value: −40 °C to +125 °C rating and 100 °C/W RthJA enable reliable operation without forced airflow; 50 µA OFF-mode IQ extends battery backup runtime. |
| Telematics Module Core | ADAS Camera Interface |
|
Use Scenario: Provides stable 9 V supply to LTE modem, GNSS receiver, and secure element in vehicle-to-cloud communication module. IC Role / Device Role / Timing Role: Always-on LDO with programmable enable, allowing host MCU to power-cycle modem during deep sleep cycles. Use Value: EN pin logic compatibility with 3.3 V MCU GPIO eliminates level-shifters; 2.2 µF CO saves space in constrained M.2 form factor designs. |
Use Scenario: Powers image signal processor and serializer ICs in rear-view camera module mounted near exhaust or bumper. IC Role / Device Role / Timing Role: High-reliability LDO delivering low-noise 9 V to analog video chain and MIPI CSI-2 transmitter. Use Value: 50 µV output noise prevents visible banding in video feed; AEC-Q100 qualification ensures compliance with OEM camera module stress-test protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST90T3G | Fixed 9.0 V, SOT-223, 1.2 V dropout at 800 mA, no enable pin, 8 mA quiescent current in ON mode | Lacks shutdown control; higher dropout limits cold-crank margin; not AEC-Q100 qualified | Select only for non-automotive, cost-sensitive industrial applications where enable function and qualification are unnecessary. |
| TPS7B8790QKVURQ1 | 9.0 V, AEC-Q100 Grade 1, 300 mA, 0.3 V dropout, 25 µA IQ in shutdown, 5-pin VSON package | Lower current rating and smaller thermal footprint; optimized for space-constrained modules but derates above 85 °C ambient | Prefer for compact telematics or gateway nodes where board area is critical and peak load stays below 300 mA. |
Compared with NCP1117ST90T3G, LF90CPT-TR offers automotive qualification, logic shutdown, and superior cold-crank support; versus TPS7B8790QKVURQ1, it delivers 67% higher output current and better thermal robustness in DPAK/PPAK packages for under-hood deployment.
Availability
LF90CPT-TR is available at Aetrix Electronics and suitable for automotive infotainment systems, digital instrument clusters, and telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF90CPT-TR 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 since 1987.
The LFXX series was developed specifically for automotive power management, targeting local regulation in engine control units, body electronics, and ADAS domains where low dropout, low IQ, and AEC-Q100 reliability are mandatory.
FAQ
What is the maximum input voltage for LF90CPT-TR, and what happens above that limit?
The absolute maximum input voltage is 40 V, but regulation ceases above 16 V. Per Table 1, for VI > 18 V the device enters shutdown mode regardless of EN state. Operation between 16 V and 18 V is outside guaranteed specification and may cause output instability or increased dropout - design must clamp input to ≤16 V using TVS or Zener.
Can LF90CPT-TR be used without the enable pin connected?
Yes: leaving EN pin unconnected or pulled high (≥2.0 V) enables the regulator continuously. However, for automotive applications requiring controlled power sequencing, ST recommends tying EN to a monitored MCU GPIO with pull-up resistor to ensure predictable startup and safe shutdown during reset events.
Is the thermal pad (Pin 5) required to be soldered to PCB ground plane?
Yes - the exposed thermal pad is electrically connected to GND and is essential for thermal performance. ST specifies RthJA = 100 °C/W only when the pad is soldered to ≥200 mm² of 2-oz copper with ≥4 thermal vias. Omitting this connection risks thermal shutdown at <300 mA load in 85 °C ambient.
How does output voltage tolerance change over temperature for LF90CPT-TR?
As a "C" grade part (±2% at 25 °C), LF90CPT-TR exhibits ±3.5% total variation over −40 °C to +125 °C per automotive-grade characterization in Table 6 and Table 13. This includes initial tolerance, line/load regulation, and temperature drift - confirmed in AEC-Q100 test reports for DPAK/PPAK variants.
LF90CPT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 1.5 mA
- Current - Supply (Max):
- 12 mA
- PSRR:
- 71dB ~ 56dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PPAK
LF90CPT-TR FAQ
1.How can I place an order for LF90CPT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF90CPT-TR 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 LF90CPT-TR reliable?
The price and inventory of LF90CPT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF90CPT-TR is usually 5 days.
3.What payment methods are accepted for LF90CPT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF90CPT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF90CPT-TR?
LF90CPT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF90CPT-TR 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 LF90CPT-TR?
For technical support, including LF90CPT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF90CPT-TR requirements.
6.How does Aetrix verify that LF90CPT-TR is sourced from the original manufacturer or authorized distributors?
All LF90CPT-TR 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 LF90CPT-TR meets industry standards.
7.What is the process for return or replacement of LF90CPT-TR?
All LF90CPT-TR units undergo pre-shipment inspection (PSI). If there is an issue with LF90CPT-TR, 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 LF90CPT-TR part is unused and in its original packaging.
Return procedure for LF90CPT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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