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Texas Instruments LP3985IM5X-5.0
- Part No.:
- LP3985IM5X-5.0
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3985IM5X-5.0.pdf
- Description:
- IC REG LINEAR 5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,816
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Product details
Overview
LP3985IM5X-5.0 from National Semiconductor is a micropower, 150mA ultra-low-dropout CMOS voltage regulator optimized for battery-powered portable wireless systems. It delivers a fixed 5.0V output with ≤100mV dropout at 150mA load, 30µVrms output noise (10Hz–100kHz), and 1.5µA shutdown current - enabling extended runtime in space-constrained CDMA/GSM handsets and portable information appliances.
For engineers reviewing the LP3985IM5X-5.0 datasheet, LP3985IM5X-5.0 pinout, LP3985IM5X-5.0 application, or LP3985IM5X-5.0 equivalent, key selection criteria include its SOT-23-5 package compatibility, logic-controlled enable input, stability with 1µF ±30% ceramic output capacitors, and guaranteed −40°C to +125°C operation without external compensation.
Technical Context
The LP3985IM5X-5.0 employs a CMOS pass transistor architecture delivering ultra-low quiescent current and minimal dropout voltage across its 2.5V–6.0V input range. Its internal bandgap reference and error amplifier are optimized for low-noise regulation, with an optional BYPASS pin supporting 0.01µF capacitor connection to reduce output noise without degrading load transient response.
Thermal shutdown (160°C) and short-circuit current limiting (600mA steady-state) ensure robust protection in compact handheld designs. The device maintains >50dB PSRR at 1kHz under VIN = VOUT + 0.2V conditions and sustains regulation down to 2.5V input - critical for Li-ion and multi-cell alkaline battery discharge profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±3% - ensures stable power for 5V-tolerant RF front-ends and baseband ICs in cellular handsets. |
| Max Output Current | 150mA guaranteed - sufficient to power GSM transceiver modules, audio codecs, or small microcontrollers without thermal derating in SOT-23-5. |
| Dropout Voltage | ≤100mV at 150mA - enables operation down to 5.1V input, extending usable battery life in single-cell Li-ion (3.0–4.2V) + boost configurations. |
| Output Noise | 30µVrms (10Hz–100kHz) - meets stringent RF section supply noise requirements for CDMA/WCDMA receivers. |
| Quiescent Current | ≤1.5µA in shutdown - preserves battery charge during standby or sleep modes in always-on portable devices. |
| PSRR | ≥50dB at 1kHz (VIN = VOUT + 0.2V) - suppresses switching noise from DC/DC converters feeding the LDO input. |
| Operating Temp | −40°C to +125°C junction - validated for automotive-infotainment and industrial handheld environments. |
| Enable Threshold | VIL ≤0.4V, VIH ≥1.4V - compatible with 1.8V/3.3V GPIOs for precise system-level power sequencing control. |
Pinout & Package
LP3985IM5X-5.0 uses the industry-standard 5-pin SOT-23 package (NS package MF05A), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. This footprint enables direct PCB replacement of other SOT-23 LDOs while maintaining thermal performance up to 250mW at 70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 2.5V–6.0V; requires ≥1µF ceramic input capacitor placed within 1cm of pin for stability and EMI suppression. |
| GND | Power ground reference | Common return path for input/output currents; must connect to clean analog ground plane to minimize noise coupling. |
| VOUT | Regulated output | Delivers fixed 5.0V ±3%; stable with 0.7–1.3µF X7R ceramic capacitor (ESR 5–500mΩ) placed adjacent to pin. |
| VEN | Logic-enable input | Active-high control: drives high (>1.4V) to enable, low (<0.4V) to shut down; draws <1nA leakage when disabled. |
| BYPASS | Noise reduction node | Connects to 0.01µF NPO/COG ceramic capacitor to ground; reduces output noise without affecting transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise regulation | 30µVrms output noise enables direct powering of sensitive RF synthesizers and ADC references without additional filtering. |
| Micro SMD & SOT-23-5 packaging | SOT-23-5 (MF05A) footprint allows drop-in integration into existing 5-pin LDO layouts while minimizing board area vs. larger packages. |
| Fast turn-on time | 200µs typical startup (95% of 5.0V) supports rapid wake-up sequences in low-power mobile applications. |
| Stable with ceramic capacitors | Guaranteed stability using low-cost, miniature 1µF ±30% X7R ceramics eliminates need for bulkier tantalum or electrolytic alternatives. |
| Integrated protection | Thermal shutdown (160°C) and short-circuit current limit (600mA) prevent damage during fault conditions without external circuitry. |
Applications
| CDMA Cellular Handsets | WCDMA Cellular Handsets |
|---|---|
Use Scenario: Powering RF transceiver ICs and frequency synthesizers requiring ultra-clean 5V supply. IC Role / Device Role / Timing Role: Low-noise post-regulator supplying critical analog blocks in CDMA baseband subsystems. Use Value: 30µVrms noise and >50dB PSRR prevent reciprocal mixing and phase noise degradation in receiver front-ends. |
Use Scenario: Providing regulated 5V bias to WCDMA power amplifiers and envelope tracking circuits. IC Role / Device Role / Timing Role: Ultra-low-dropout LDO delivering stable voltage during high-current PA burst transmission. Use Value: ≤100mV dropout at 150mA maintains output regulation even as battery voltage sags below 5.1V during transmit peaks. |
| GSM Cellular Handsets | Portable Information Appliances |
Use Scenario: Supplying 5V to GSM modem ICs and SIM interface controllers in compact form factors. IC Role / Device Role / Timing Role: Enable-controlled power rail managing modem active/idle states to minimize system standby current. Use Value: 1.5µA shutdown current extends battery life during SMS/data idle periods without sacrificing fast wake-up latency. |
Use Scenario: Regulating 5V for LCD controllers, touch-screen digitizers, and flash memory interfaces in PDAs and e-readers. IC Role / Device Role / Timing Role: Primary voltage source for mixed-signal peripherals requiring low-noise, thermally efficient power delivery. Use Value: −40°C to +125°C operation ensures reliability in uncontrolled ambient environments like automotive docks or outdoor kiosks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-5002E/MB | 100mA max output, 6µA quiescent current, no BYPASS pin for noise reduction | Limited to lower-current peripherals; lacks noise optimization for RF sections | Select when cost sensitivity outweighs RF noise requirements and load current stays below 100mA |
| TLS850B2L1ETV50 | Automotive-grade AEC-Q100, 500mA output, higher 25µA quiescent current, integrated reset | Designed for 12V automotive systems; overqualified for portable battery operation | Choose only for automotive infotainment where qualification and higher current are mandatory |
Compared with MCP1700T-5002E/MB and TLS850B2L1ETV50, the LP3985IM5X-5.0 uniquely balances 150mA capability, 30µVrms noise, and 1.5µA shutdown in a standard SOT-23-5 - making it optimal for space-constrained, battery-sensitive RF subsystems where noise and efficiency are co-prioritized.
Availability
LP3985IM5X-5.0 is available at Aetrix Electronics and suitable for CDMA/WCDMA handset design, portable information appliance development, and industrial handheld instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP3985IM5X-5.0 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
National Semiconductor was a U.S.-based semiconductor company specializing in analog and power management ICs before its acquisition by Texas Instruments in 2011. Its legacy LDO portfolio emphasizes precision, low noise, and miniaturization for portable electronics.
The LP3985 series was designed specifically for battery-powered wireless handsets and portable information appliances demanding ultra-low dropout, micropower shutdown, and ceramic-capacitor stability in sub-3mm² footprints.
FAQ
What is the maximum input voltage rating for LP3985IM5X-5.0?
The absolute maximum input voltage for LP3985IM5X-5.0 is 6.5V, but the recommended operating range is 2.5V to 6.0V. Exceeding 6.0V risks violating the device's safe operating area, especially at elevated temperatures. For reliable long-term operation in battery-powered systems, VIN should remain ≤6.0V with appropriate headroom above the 5.0V output to maintain regulation.
Does LP3985IM5X-5.0 require an external bypass capacitor for basic operation?
No, LP3985IM5X-5.0 operates stably without the BYPASS capacitor. The 0.01µF capacitor on the BYPASS pin is optional and used solely to reduce output noise - it does not affect regulation stability or transient response. Omitting it results in higher output noise (still within spec at 30µVrms typ.) but retains full functionality including fast turn-on and load regulation.
Can LP3985IM5X-5.0 be used with a 0.47µF output capacitor?
No - LP3985IM5X-5.0 requires a minimum 0.7µF output capacitance (±30%) for guaranteed stability across temperature and load. A 0.47µF capacitor falls below the specified 0.7µF minimum and may cause oscillation or poor transient response. Use only 1.0µF X7R ceramic (0.7–1.3µF range) or verified high-quality tantalum capacitors meeting ESR and tolerance specs.
What is the thermal shutdown behavior of LP3985IM5X-5.0?
LP3985IM5X-5.0 activates thermal shutdown at 160°C junction temperature and remains latched off until the die cools by at least 20°C (hysteresis). During shutdown, output is disabled and quiescent current drops to ≤1.5µA. Once cooled, the device automatically resumes regulation if VEN is high and VIN is within spec - no external reset is needed.
Is LP3985IM5X-5.0 RoHS compliant and lead-free?
Yes, LP3985IM5X-5.0 is RoHS compliant and lead-free per National Semiconductor's CSP-9-111S2 specification. The SOT-23-5 package uses matte tin lead finish, and all materials meet banned substances restrictions. Full compliance documentation is available through National Semiconductor's archived product pages and TI's post-acquisition support portal.
LP3985IM5X-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.1V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 50dB ~ 40dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3985IM5X-5.0 FAQ
1.How can I place an order for LP3985IM5X-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3985IM5X-5.0 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 LP3985IM5X-5.0 reliable?
The price and inventory of LP3985IM5X-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3985IM5X-5.0 is usually 5 days.
3.What payment methods are accepted for LP3985IM5X-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3985IM5X-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3985IM5X-5.0?
LP3985IM5X-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3985IM5X-5.0 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 LP3985IM5X-5.0?
For technical support, including LP3985IM5X-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3985IM5X-5.0 requirements.
6.How does Aetrix verify that LP3985IM5X-5.0 is sourced from the original manufacturer or authorized distributors?
All LP3985IM5X-5.0 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 LP3985IM5X-5.0 meets industry standards.
7.What is the process for return or replacement of LP3985IM5X-5.0?
All LP3985IM5X-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP3985IM5X-5.0, 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 LP3985IM5X-5.0 part is unused and in its original packaging.
Return procedure for LP3985IM5X-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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