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Texas Instruments LP3985IM5-5.0
- Part No.:
- LP3985IM5-5.0
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3985IM5-5.0.pdf
- Description:
- IC REG LINEAR 5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,597
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Product details
Overview
LP3985IM5-5.0 from Texas Instruments is a fixed-output, ultra-low-dropout CMOS voltage regulator delivering 150 mA at 5.0 V with ≤100 mV dropout at full load, 30 µVRMS output noise (10 Hz–100 kHz), and 50 dB PSRR at 1 kHz - designed for RF power amplifier biasing and low-noise analog supply in cellular handsets.
For engineers reviewing the LP3985IM5-5.0 datasheet, LP3985IM5-5.0 pinout, LP3985IM5-5.0 application, or LP3985IM5-5.0 equivalent, key selection criteria include verified 5.0-V output tolerance (±3%), shutdown current ≤1.5 µA, fast 200 µs turn-on time with bypass capacitor pre-charge, and DSBGA/SOT-23 package compatibility for space-constrained portable designs.
Technical Context
The LP3985IM5-5.0 integrates a precision 1.23-V bandgap reference, internal 70-µA BYPASS pin pre-charge circuit, and thermal shutdown (160°C) with 20°C hysteresis. Its CMOS pass element enables ultra-low quiescent current (85 µA at no load, 140 µA at 150 mA) and minimal ground current increase in dropout.
Operation requires VIN ≥ 5.3 V (VOUT + 0.3 V minimum), EN logic-high threshold ≥1.4 V, and stable regulation with 1-µF ceramic output capacitor. The BYPASS pin accepts a 0.01-µF capacitor to reduce output noise without degrading transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±3% over −40°C to 125°C junction temperature |
| Max Dropout Voltage | 100 mV at 150 mA load - enables operation down to VIN = 5.1 V |
| Quiescent Current | 85 µA (no load), 140 µA (150 mA) - extends battery life in standby |
| PSRR @ 1 kHz | 50 dB at VIN = VOUT + 0.2 V - suppresses switching noise from upstream DC/DC converters |
| Output Noise | 30 µVRMS (10 Hz–100 kHz) with 0.01-µF BYPASS capacitor - suitable for RF PA bias rails |
| Enable Threshold | VIL ≤ 0.4 V (disable), VIH ≥ 1.4 V (enable) - compatible with 1.8-V/3.3-V logic |
| Shutdown Current | ≤1.5 µA - meets ultra-low-power requirements for always-on subsystems |
Pinout & Package
LP3985IM5-5.0 is packaged in SOT-23 (DBV) - 2.90 mm × 1.60 mm nominal footprint - with 5 terminals arranged in standard single-row configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 2.5 V–6 V; requires local 1-µF ceramic decoupling within 1 cm of pin |
| 2 (GND) | Power ground reference | Common return path for IN, OUT, EN, and BYPASS; must connect to clean analog ground plane |
| 3 (EN) | Logic-controlled enable input | Active-high; pulls low to disable regulator and reduce current to ≤1.5 µA |
| 4 (BYPASS) | Noise reduction control node | Connects 0.01-µF capacitor to reduce output noise; internally pre-charged for 200 µs startup |
| 5 (OUT) | Regulated output voltage | Delivers stable 5.0 V ±3% at up to 150 mA; stable with 1-µF X7R ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise regulation | 30 µVRMS output noise with 0.01-µF BYPASS capacitor - critical for RF power amplifier stability |
| Fast, controlled startup | 200 µs turn-on time achieved via internal 70-µA BYPASS pre-charge - avoids brownout during power sequencing |
| Low-dropout operation | 60 mV typical dropout at 150 mA - maximizes usable battery voltage range in Li-ion systems |
| Thermal & short-circuit protection | 160°C thermal shutdown with 20°C hysteresis and 600 mA short-circuit limit - ensures robustness in handheld thermal environments |
| CMOS architecture | Ground current increases only slightly in dropout - preserves battery runtime longer than bipolar LDOs |
Applications
| CDMA RF Power Amplifier Bias | GSM Transceiver Core Supply |
|---|---|
Use Scenario: Providing clean, stable 5.0-V bias to CDMA PA stages in mobile handsets operating under dynamic load conditions. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO delivering regulated 5.0 V to PA collector/drain rail with minimal ripple coupling. Use Value: 30 µVRMS noise and 50 dB PSRR prevent AM-to-PM distortion and adjacent channel leakage in CDMA transmission. | Use Scenario: Supplying core logic voltage to GSM transceiver ICs requiring tight regulation and fast load transient response. IC Role / Device Role / Timing Role: Primary 5.0-V LDO for transceiver digital baseband and RF synthesizer blocks. Use Value: 200 µs turn-on time synchronizes with system power-up sequencing; 100 mV dropout extends talk-time from aging batteries. |
| Portable GPS Receiver LNA Supply | Bluetooth Audio Codec Reference Rail |
Use Scenario: Powering low-noise amplifier (LNA) in compact GPS modules where EMI sensitivity demands ultra-clean supply. IC Role / Device Role / Timing Role: Dedicated 5.0-V analog supply rail for GPS LNA front-end, isolated from noisy digital domains. Use Value: 30 µVRMS noise floor ensures <−160 dBm sensitivity; DSBGA package minimizes PCB area in miniaturized modules. | Use Scenario: Delivering precision 5.0-V reference to Bluetooth audio codec ICs in wireless earbuds with strict size constraints. IC Role / Device Role / Timing Role: Fixed-output LDO supplying DAC/ADC reference and analog I/O circuitry. Use Value: ±3% output tolerance maintains SNR >95 dB; 1.5 µA shutdown current enables zero-power storage mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGQ | 7-channel high-side driver with integrated 5-V LDO; higher quiescent current (25 µA active), no BYPASS pin | Designed for LED/relay driving, not ultra-low-noise analog supply | Select only if multi-channel switching + basic regulation required; not suitable for RF or precision analog |
| MCP1700T-5002E/MB | Single-output 5.0-V LDO; 6 µA quiescent current, 175 mV dropout at 250 mA, no BYPASS pin, 40 µVRMS noise | Lacks noise-reduction capability and fast startup; rated for industrial temp only (−40°C to +125°C) | Use where ultra-low IQ dominates over noise performance; avoid in RF-sensitive signal chains |
Compared with LP3985IM5-5.0, TPL7407LPGQ trades noise performance for integration and MCP1700T-5002E/MB sacrifices noise suppression and startup speed for lower IQ - making LP3985IM5-5.0 uniquely suited for RF-biased, battery-powered analog circuits demanding both cleanliness and responsiveness.
Availability
LP3985IM5-5.0 is available at Aetrix Electronics and suitable for CDMA/GSM handset design, portable GPS module production, Bluetooth audio device manufacturing, and other applications requiring stable component supply with guaranteed long-term availability.
Supply support for LP3985IM5-5.0 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with leadership in power management innovation.
The LP3985 product line delivers micropower, ultra-low-noise LDOs optimized for battery-powered wireless devices - targeting cellular handsets, portable information appliances, and RF subsystems where size, efficiency, and signal integrity are critical.
FAQ
What is the maximum input voltage rating for LP3985IM5-5.0?
The absolute maximum input voltage for LP3985IM5-5.0 is 6.5 V, but recommended operating VIN is 2.5 V to 6 V. Exceeding 6.5 V risks permanent damage per Absolute Maximum Ratings. For reliable 5.0-V output, VIN must be ≥5.3 V (VOUT + 0.3 V) to maintain regulation - confirmed in Section 6.3 Recommended Operating Conditions of the SNVS087AE datasheet.
Does LP3985IM5-5.0 require an external bypass capacitor to meet its 30 µVRMS noise specification?
Yes, LP3985IM5-5.0 achieves 30 µVRMS output noise (10 Hz–100 kHz) only when a 0.01-µF capacitor is connected to the BYPASS pin. Without it, output noise rises significantly - the BYPASS pin enables internal pre-charge for fast startup and noise filtering. This requirement is explicitly stated in Sections 1 (Features), 7.3.3 (Fast On-Time), and 8.2.2.5 (Noise Bypass Capacitor) of the datasheet.
Can LP3985IM5-5.0 operate stably with a 1-µF X5R ceramic capacitor on the output?
Yes, LP3985IM5-5.0 is stable with 1-µF X5R ceramic capacitors, though X7R is preferred for wider temperature coverage (−55°C to 125°C vs. −55°C to 85°C). The datasheet confirms stability with "1-µF ±30% ceramic or high-quality tantalum" in Section 1 (Features) and Section 8.2.2.3 (Output Capacitor), specifying ESR between 5 mΩ and 500 mΩ.
What is the thermal shutdown behavior of LP3985IM5-5.0?
LP3985IM5-5.0 activates thermal shutdown at 160°C junction temperature with 20°C hysteresis, meaning it resumes operation only after cooling to ≤140°C. This protection is built into the die and functions independently of load or input conditions. The value is specified in Section 6.5 Electrical Characteristics (TSD parameter) and validated across process corners per TI's production test methodology.
Is LP3985IM5-5.0 pin-compatible with other LP3985 variants like LP3985IM5-3.3?
Yes, all LP3985IM5-x.x variants share identical SOT-23-5 (DBV) pinout and package dimensions - IN, GND, EN, BYPASS, and OUT occupy the same physical locations regardless of output voltage. Pin functions are fully consistent across the family, as confirmed in Section 5 (Pin Configuration and Functions) of the datasheet, enabling drop-in replacement when only output voltage differs.
LP3985IM5-5.0 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
LP3985IM5-5.0 FAQ
1.How can I place an order for LP3985IM5-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3985IM5-5.0 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 LP3985IM5-5.0 reliable?
The price and inventory of LP3985IM5-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3985IM5-5.0 is usually 5 days.
3.What payment methods are accepted for LP3985IM5-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3985IM5-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3985IM5-5.0?
LP3985IM5-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3985IM5-5.0 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 LP3985IM5-5.0?
For technical support, including LP3985IM5-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3985IM5-5.0 requirements.
6.How does Aetrix verify that LP3985IM5-5.0 is sourced from the original manufacturer or authorized distributors?
All LP3985IM5-5.0 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 LP3985IM5-5.0 meets industry standards.
7.What is the process for return or replacement of LP3985IM5-5.0?
All LP3985IM5-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP3985IM5-5.0, 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 LP3985IM5-5.0 part is unused and in its original packaging.
Return procedure for LP3985IM5-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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