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STMicroelectronics LF90ABV
- Part No.:
- LF90ABV
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LF90ABV.pdf
- Description:
- IC REG LINEAR 9V 500MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,690
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Product details
Overview
LF90ABV from STMicroelectronics is a very low dropout (LDO) linear voltage regulator in the LF00 series, delivering 9.0 V output at up to 500 mA with 0.45 V typical dropout at 200 mA. It features logic-controlled electronic shutdown (TTL-compatible enable), ±1% output voltage accuracy at 25°C, and operates across –40°C to +125°C for automotive and industrial power rails. It is used as a local regulator in battery-powered systems requiring ultra-low quiescent current (50 µA in OFF mode).
For engineers reviewing the LF90ABV datasheet, LF90ABV pinout, LF90ABV application, or LF90ABV equivalent, key selection criteria include dropout voltage under load, shutdown control interface compatibility, thermal performance in TO-220FP package, and stability with minimal 2.2 µF output capacitance.
Technical Context
The LF90ABV implements a PNP pass transistor architecture enabling sub-0.5 V dropout while maintaining tight line/load regulation (≤10 mV). Its internal current and thermal limiting protect against fault conditions without external circuitry.
It integrates a TTL-compatible shutdown input (Pin 2) that places the regulator in ultra-low-power OFF mode (50 µA IQ) when pulled low, enabling system-level power gating in multi-rail embedded designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 9.0 V ±1% at 25°C - ensures stable supply for 9 V logic or analog subsystems without trimming. |
| Dropout Voltage | 0.45 V typ. at 200 mA - enables operation from 9.45 V input, critical for single-cell LiFePO₄ or 12 V rail derating. |
| Quiescent Current | 50 µA in OFF mode, 500 µA in ON mode - minimizes standby drain in always-on battery systems. |
| Output Current | 500 mA continuous - supports moderate-power microcontrollers, sensors, or interface ICs. |
| Input Voltage Range | 2.5 V to 16 V - accommodates wide-input industrial supplies and unregulated DC sources. |
| Supply Rejection | 80 dB typ. at 120 Hz - suppresses ripple from switching pre-regulators or noisy DC/DC stages. |
| Operating Temp | –40°C to +125°C junction - qualified for under-hood automotive and industrial control environments. |
| Stability Cap | 2.2 µF ceramic output capacitor - reduces board area and BOM cost vs. traditional 10–22 µF requirements. |
Pinout & Package
LF90ABV is supplied in TO-220FP package - a 5-pin, full-molded variant of TO-220 with isolated tab, optimized for surface-mount assembly and thermal performance (RthJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input (IN) | Main power input | Accepts 2.5–16 V DC; requires local 0.1 µF ceramic bypass capacitor. |
| 2 - Shutdown (SHDN) | Logic enable control | TTL-compatible input: <0.8 V = OFF (50 µA IQ), >2.0 V = ON (500 µA IQ). |
| 3 - Ground (GND) | Reference and return path | Common reference for both input and output circuits; must be low-impedance. |
| 4 - Output (OUT) | Regulated voltage source | Delivers 9.0 V ±1% at up to 500 mA; requires 2.2 µF ceramic output capacitor. |
| 5 - Tab (Exposed Pad) | Thermal and electrical ground | Internally connected to GND; must be soldered to PCB copper pour for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 0.45 V at 200 mA enables use with marginal input margins - e.g., 9.45 V min input for 9 V output. |
| Logic-controlled shutdown | TTL-compatible SHDN pin allows precise system-level power sequencing and sleep-state control. |
| ±1% output accuracy | Guaranteed over temperature and load - eliminates need for post-production calibration in precision 9 V rails. |
| Internal protection | Integrated current limit and thermal shutdown prevent damage during overload or poor heatsinking. |
| Minimal external components | Stable with only 0.1 µF input + 2.2 µF output ceramic caps - reduces footprint and cost vs. legacy LDOs. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Local 9 V supply for CAN transceiver biasing and sensor signal conditioning in BCM nodes. IC Role / Device Role / Timing Role: Primary LDO regulator providing clean, low-noise 9 V rail with fast transient response to CAN bus activity. Use Value: 50 µA OFF-mode current extends battery life during vehicle sleep; 80 dB PSRR suppresses ignition noise coupling. |
Use Scenario: Dedicated 9 V rail for analog input front-end (RTD, thermocouple) in modular PLC backplanes. IC Role / Device Role / Timing Role: Precision local regulator ensuring stable reference for 16-bit ADCs and isolation drivers. Use Value: ±1% output tolerance maintains measurement accuracy; –40°C to +125°C rating supports cabinet-mounted operation. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Powering low-noise op-amps and ECG front-end ASICs in handheld patient monitors. IC Role / Device Role / Timing Role: Ultra-low-noise (50 µV RMS) 9 V source minimizing baseline drift in biopotential amplification. Use Value: 2.2 µF stability cap saves space on compact PCBs; low dropout preserves runtime from single Li-ion cell. |
Use Scenario: Providing regulated 9 V for metrology-grade voltage reference and RTC backup in utility meters. IC Role / Device Role / Timing Role: High-reliability LDO with thermal/current protection for long-life, sealed-meter applications. Use Value: Internal fault protection avoids field failures; TO-220FP package enables conformal coating and mechanical robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD1086DT90TR | Fixed 9 V output, 1.5 A rating, 1.3 V dropout, no shutdown pin | Higher current, higher dropout, no logic control - suitable where headroom >1.3 V exists and enable not required | Select when higher output current is needed and system does not require shutdown sequencing. |
| TLV76790QWDRBRQ1 | Automotive-grade 9 V LDO, 1 A, 220 mV dropout, integrated enable, 30 µA IQ (OFF) | Lower dropout and IQ, but requires minimum 4.7 µF output cap and has tighter input range (2.5–16 V same) | Prefer for new automotive designs needing lower IQ and better dropout, accepting larger output capacitor. |
Compared with LD1086DT90TR and TLV76790QWDRBRQ1, LF90ABV offers the best balance of ultra-low dropout (0.45 V), industry-standard 2.2 µF stability, and proven thermal robustness in TO-220FP - making it optimal for cost-sensitive, space-constrained industrial and legacy automotive platforms.
Availability
LF90ABV is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, portable medical devices, and smart energy metering requiring stable component supply and long-lifecycle support.
Supply support for LF90ABV 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
LF90ABV belongs to the LF00 series of very low-dropout linear regulators, engineered specifically for battery-powered and thermally constrained applications demanding high accuracy, low IQ, and robust fault protection.
FAQ
What is the minimum input voltage required for LF90ABV to maintain regulation at 500 mA?
The dropout voltage is 0.7 V max at 500 mA per datasheet Table 7–20. With a nominal 9.0 V output, the minimum input is 9.7 V. This ensures regulation under worst-case load and temperature conditions, and accounts for PCB trace drops and input capacitor ESR.
Can LF90ABV be used without the shutdown pin connected?
Yes - Pin 2 (SHDN) can be left open or tied to IN (via resistor) to force permanent ON operation. However, tying it directly to GND will disable the regulator. For reliable startup, pull-up to IN with ≥10 kΩ is recommended if shutdown functionality is unused.
Is a heatsink required for LF90ABV in TO-220FP package at 500 mA?
At 500 mA with 12 V input and 9 V output, power dissipation is (12 − 9) × 0.5 = 1.5 W. With RthJA = 60°C/W (TO-220FP), junction rise is ~90°C above ambient. A modest 15 cm² copper pour is sufficient below 60°C ambient; forced air or heatsink advised above that.
Does LF90ABV support ceramic output capacitors with low ESR?
Yes - the LF00 series is explicitly designed for stability with 2.2 µF ceramic capacitors having ESR between 0.1 Ω and 10 Ω. No series resistor is needed, unlike older LDOs. This simplifies layout and improves transient response compared to tantalum or aluminum electrolytic alternatives.
LF90ABV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LF90ABV FAQ
1.How can I place an order for LF90ABV through Aetrix?
Please submit a Request for Quotation (RFQ) for LF90ABV 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 LF90ABV reliable?
The price and inventory of LF90ABV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF90ABV is usually 5 days.
3.What payment methods are accepted for LF90ABV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF90ABV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF90ABV?
LF90ABV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF90ABV 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 LF90ABV?
For technical support, including LF90ABV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF90ABV requirements.
6.How does Aetrix verify that LF90ABV is sourced from the original manufacturer or authorized distributors?
All LF90ABV 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 LF90ABV meets industry standards.
7.What is the process for return or replacement of LF90ABV?
All LF90ABV units undergo pre-shipment inspection (PSI). If there is an issue with LF90ABV, 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 LF90ABV part is unused and in its original packaging.
Return procedure for LF90ABV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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