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Texas Instruments LP2985IM5-3.8
- Part No.:
- LP2985IM5-3.8
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985IM5-3.8.pdf
- Description:
- IC REG LINEAR 3.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
LP2985IM5-3.8 from Texas Instruments is a micropower, ultra-low-dropout linear regulator in SOT-23-5 package delivering 150 mA output current with 3.8 V fixed output voltage, 1% accuracy (A-grade), 350 mV max dropout at 150 mA, and 30 µVRMS output noise (300 Hz–50 kHz) when using a 10 nF bypass capacitor. It serves as a precision low-noise power supply for battery-powered microcontrollers and RF front-ends.
For engineers reviewing the LP2985IM5-3.8 datasheet, LP2985IM5-3.8 pinout, LP2985IM5-3.8 application, or LP2985IM5-3.8 equivalent, key selection criteria include guaranteed 150 mA load capability across −40°C to 125°C, shutdown quiescent current < 0.01 µA, stability with 2.2 µF ceramic output capacitor (ESR ≥ 5 mΩ), and ON/OFF logic control with 1.6 V enable threshold.
Technical Context
The LP2985IM5-3.8 uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout and minimal ground current-75 µA at 1 mA load and 850 µA at 150 mA load. Its internal reference and feedback loop ensure 1% output voltage tolerance over line, load, and temperature (−40°C to 125°C).
It integrates active ON/OFF control with hysteresis: device enables when ON/OFF pin exceeds 1.6 V and disables below 0.15 V, reducing quiescent current to < 2 µA. The BYPASS pin supports external 10 nF capacitor to suppress reference noise, lowering total output noise to 30 µVRMS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.8 V ±1% (A-grade); ensures stable core voltage for 3.3 V–3.8 V tolerant logic without external resistive feedback. |
| Max Output Current | 150 mA continuous; sufficient to power ARM Cortex-M0+ MCUs, BLE SoCs, or analog sensor signal chains. |
| Dropout Voltage | 350 mV max at 150 mA, −40°C to 125°C; enables operation from single Li-ion (3.0–4.2 V) or 5 V rail with margin. |
| Quiescent Current | 75 µA at 1 mA load; extends battery life in always-on sensor nodes and wearable devices. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz) with 10 nF BYPASS cap; meets low-noise requirements for ADC references and RF LNA biasing. |
| Shutdown Current | < 0.01 µA typical; reduces system standby power to nanoampere level during deep sleep modes. |
| Stability ESR Range | Compatible with ceramic capacitors down to 5 mΩ ESR; eliminates need for tantalum or aluminum electrolytic output caps. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 3.1 V to 16 V input; requires ≥1 µF ceramic decoupling within 1 cm of pin for stability. |
| GND (Pin 2) | Ground reference | Device substrate connection; must be tied to clean analog ground plane to minimize noise coupling. |
| ON/OFF (Pin 3) | Enable/disable control input | Logic-high (>1.6 V) enables regulator; logic-low (<0.15 V) forces shutdown with <2 µA current draw. |
| BYPASS (Pin 4) | Noise reduction node | Connects to GND via 10 nF ceramic capacitor to reduce reference noise and achieve 30 µVRMS output noise. |
| OUT (Pin 5) | Regulated output | Delivers 3.8 V ±1% at up to 150 mA; requires ≥2.2 µF ceramic output capacitor with ESR ≥5 mΩ for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 350 mV max at full 150 mA load across temperature ensures reliable regulation from aging batteries. |
| Low-noise architecture | 30 µVRMS output noise with 10 nF BYPASS cap enables use in precision analog and RF subsystems. |
| 1% output accuracy (A-grade) | Guaranteed over line, load, and −40°C to 125°C junction range-critical for voltage-sensitive digital cores. |
| Active ON/OFF control | Enables precise system-level power sequencing and zero-power shutdown without external MOSFETs. |
| Stable with low-ESR ceramics | Supports 2.2 µF X7R/X5R ceramics (ESR ≥5 mΩ), eliminating cost, size, and reliability penalties of tantalum caps. |
Applications
| Wireless Sensor Node | Portable Medical Device |
|---|---|
|
Use Scenario: Battery-powered BLE temperature/humidity sensor operating continuously for >2 years on CR2032. IC Role / Device Role / Timing Role: Primary 3.8 V supply for nRF52832 SoC and analog front-end; provides regulated bias for op-amps and ADC reference. Use Value: 75 µA quiescent current and <0.01 µA shutdown current extend battery life; 30 µVRMS noise prevents ADC quantization errors. |
Use Scenario: Handheld pulse oximeter with optical sensing, analog signal conditioning, and OLED display. IC Role / Device Role / Timing Role: Clean 3.8 V rail for photodiode transimpedance amplifier and 16-bit SAR ADC reference. Use Value: 1% output accuracy maintains measurement linearity; low dropout allows operation down to 3.1 V input from depleted Li-ion cell. |
| Industrial IoT Edge Controller | Wearable Fitness Tracker |
|
Use Scenario: DIN-rail mounted edge gateway with dual-core MCU, RS-485 transceiver, and isolated CAN interface. IC Role / Device Role / Timing Role: Secondary 3.8 V supply for isolated communication ICs and real-time clock backup domain. Use Value: −40°C to 125°C junction rating ensures reliability in uncontrolled industrial enclosures; ON/OFF pin enables firmware-controlled power gating. |
Use Scenario: Compact wrist-worn tracker with accelerometer, heart-rate sensor, and Bluetooth LE radio. IC Role / Device Role / Timing Role: Low-noise 3.8 V supply for optical heart-rate monitoring analog chain and MCU core logic. Use Value: SOT-23-5 footprint minimizes PCB area; 350 mV dropout preserves runtime as battery discharges from 4.2 V to 3.0 V. |
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 |
|---|---|---|---|
| TPL720F38 | 300 mA output, 25 µVRMS noise, 250 mV dropout at 300 mA, same SOT-23-5 package. | Higher current capacity suits systems with burst-mode peripherals; lower noise benefits high-resolution ADCs. | Select when >150 mA load or sub-25 µVRMS noise is required; not drop-in due to different EN pin logic (active-low vs. LP2985IM5-3.8 active-high). |
| MCP1703T-3802E/MB | 250 mA output, 40 µVRMS noise, 600 mV dropout at 250 mA, SOT-23-5, no BYPASS pin. | Lacks dedicated noise-reduction pin; requires higher ESR output caps (≥100 mΩ) for stability. | Choose for cost-sensitive designs where 30 µVRMS noise is non-critical and 600 mV dropout is acceptable. |
Compared with TPL720F38 and MCP1703T-3802E/MB, the LP2985IM5-3.8 uniquely balances ultra-low dropout (350 mV), 1% A-grade accuracy, and 30 µVRMS noise with active-high ON/OFF control-making it optimal for space-constrained, battery-life-critical applications requiring precision analog performance.
Availability
LP2985IM5-3.8 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, industrial IoT controllers, and wearable fitness trackers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP2985IM5-3.8 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 and embedded processing technologies, with leadership in power management, signal chain, and connectivity solutions.
The LP2985-N product line delivers micropower, ultra-low-dropout regulators optimized for battery-powered portable electronics-designed to maximize runtime while maintaining precision, low noise, and thermal robustness in compact SOT-23 packages.
FAQ
What is the minimum input voltage required for LP2985IM5-3.8 to regulate 3.8 V at 150 mA?
The LP2985IM5-3.8 requires a minimum input voltage of 4.15 V (3.8 V + 350 mV max dropout) to maintain regulation at 150 mA load across −40°C to 125°C. At room temperature and 1 mA load, dropout drops to 10 mV, allowing operation from as low as 3.81 V. Always verify headroom against worst-case dropout and input tolerance in final design.
Can LP2985IM5-3.8 operate without the BYPASS capacitor?
Yes, LP2985IM5-3.8 functions without the BYPASS capacitor but delivers higher output noise-typically 75 µVRMS (300 Hz–50 kHz) versus 30 µVRMS with a 10 nF ceramic cap on the BYPASS pin. Omitting the capacitor is acceptable for non-noise-sensitive digital loads, but required for analog/RF applications demanding lowest possible noise floor.
Is LP2985IM5-3.8 compatible with ceramic output capacitors smaller than 2.2 µF?
No. The LP2985IM5-3.8 datasheet specifies a minimum 2.2 µF ceramic output capacitor for stability across all loads and temperatures. Using smaller values risks oscillation or poor transient response. Capacitance may be increased without limit, but ESR must remain ≥5 mΩ-achievable with standard X7R/X5R ceramics in 0603 or 0805 case sizes.
How does the ON/OFF pin behave during power-up?
The LP2985IM5-3.8 requires the ON/OFF pin to exceed 1.6 V (min) to initiate startup; if left floating or pulled below 0.15 V, the device remains disabled. During power-up, tie ON/OFF to IN through a 100 kΩ resistor or actively drive it high after VIN stabilizes to prevent erratic enable behavior. Do not rely on weak pull-ups-TI recommends active termination.
Does LP2985IM5-3.8 provide reverse polarity protection?
No. LP2985IM5-3.8 lacks internal reverse-polarity protection. Applying reverse voltage between IN and GND or OUT and GND can damage the device. External protection-such as a series Schottky diode on the input or a back-to-back MOSFET circuit-is required in systems where incorrect battery insertion or field wiring reversal is possible.
LP2985IM5-3.8 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):
- 16V
- Voltage - Output (Min/Fixed):
- 3.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.58V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- 2.5 mA
- PSRR:
- 45dB (1kHz)
- 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
LP2985IM5-3.8 FAQ
1.How can I place an order for LP2985IM5-3.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985IM5-3.8 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 LP2985IM5-3.8 reliable?
The price and inventory of LP2985IM5-3.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985IM5-3.8 is usually 5 days.
3.What payment methods are accepted for LP2985IM5-3.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985IM5-3.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985IM5-3.8?
LP2985IM5-3.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985IM5-3.8 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 LP2985IM5-3.8?
For technical support, including LP2985IM5-3.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985IM5-3.8 requirements.
6.How does Aetrix verify that LP2985IM5-3.8 is sourced from the original manufacturer or authorized distributors?
All LP2985IM5-3.8 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 LP2985IM5-3.8 meets industry standards.
7.What is the process for return or replacement of LP2985IM5-3.8?
All LP2985IM5-3.8 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985IM5-3.8, 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 LP2985IM5-3.8 part is unused and in its original packaging.
Return procedure for LP2985IM5-3.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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