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Texas Instruments LP2985IM5-4.5
- Part No.:
- LP2985IM5-4.5
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP2985IM5-4.5.pdf
- Description:
- IC REG LINEAR 4.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
LP2985IM5-4.5 from Texas Instruments is a micropower, ultra-low-dropout linear regulator (LDO) delivering 150 mA output current with 4.5 V fixed output voltage, 1% accuracy (A-grade), 300 mV typical dropout at full load, and <1 µA shutdown quiescent current - designed for battery-powered portable electronics requiring low noise and high efficiency.
For engineers reviewing the LP2985IM5-4.5 datasheet, LP2985IM5-4.5 pinout, LP2985IM5-4.5 application, or LP2985IM5-4.5 equivalent, key selection criteria include dropout voltage at 150 mA, BYPASS-pin-enabled 30 µVRMS noise performance, SOT-23-5 package thermal resistance (169.0°C/W), and ON/OFF logic-controlled enable functionality.
Technical Context
The LP2985IM5-4.5 uses a vertically integrated PNP (VIP) process to achieve ultra-low dropout (280–575 mV at 150 mA over temperature) and low ground current (850 µA typical at 150 mA). Its internal reference and feedback loop ensure 1% output voltage accuracy across –40°C to 125°C junction temperature.
It features active ON/OFF control with 1.6 V turn-on threshold and 0.15 V turn-off threshold, foldback current limiting (400 mA short-circuit, 350 mA peak), and thermal shutdown protection. Stability is guaranteed with ceramic output capacitors as low as 2.2 µF and ESR down to 5 mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5 V ±1% (A-grade), ensuring stable rail for 4.5 V–tolerant microcontrollers and analog sensors. |
| Max Output Current | 150 mA continuous, supporting moderate-power RF modules or display drivers without external pass devices. |
| Dropout Voltage | 280 mV (typ) / 575 mV (max) at 150 mA and –40°C to 125°C - enables operation from single-cell Li-ion (3.0–4.2 V) with margin. |
| Quiescent Current | 75 µA at 1 mA load; 850 µA at 150 mA load - minimizes battery drain in always-on sensor nodes. |
| Shutdown Current | <1 µA typical when ON/OFF pin < 0.15 V - extends shelf life and enables deep-sleep modes in wearables. |
| Output Noise | 30 µVRMS (300 Hz–50 kHz) with 10 nF BYPASS capacitor - suitable for noise-sensitive ADCs and RF front-ends. |
| PSRR | 45 dB at 1 kHz with BYPASS capacitor - suppresses switching noise from upstream DC-DC converters. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 1.3 mm height, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5 V–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 regulation; logic-low (<0.15 V) disables output and reduces IQ to <1 µA. |
| BYPASS (Pin 4) | Noise reduction terminal | Connects to 10 nF ceramic capacitor to GND to reduce output noise to 30 µVRMS; bypasses internal reference. |
| OUT (Pin 5) | Regulated output | Delivers 4.5 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 | 300 mV typical at 150 mA enables use with single-cell Li-ion (3.0–4.2 V) while maintaining 4.5 V output under load. |
| Low-noise operation | 30 µVRMS output noise via dedicated BYPASS pin supports high-resolution ADCs and RF ICs without external filtering. |
| ON/OFF logic control | CMOS-compatible enable input allows precise power sequencing and system-level sleep/wake coordination. |
| Ceramic-capacitor stability | Stable with 2.2 µF output capacitor and ESR as low as 5 mΩ - eliminates need for bulkier tantalum or electrolytic caps. |
| Integrated protection | Foldback current limiting (400 mA SC) and thermal shutdown prevent damage during fault conditions without external circuitry. |
Applications
| Portable Medical Sensors | Wearable Fitness Trackers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) with Bluetooth LE radio and precision analog front-end. IC Role / Device Role / Timing Role: Primary 4.5 V LDO supplying ADC reference, op-amps, and BLE SoC core voltage. Use Value: 30 µVRMS noise ensures sub-12-bit ADC accuracy; 150 mA capacity powers BLE burst transmission; 1 µA shutdown extends 7-day battery life. |
Use Scenario: Optical heart-rate sensor module with photodiode amplifier and MCU in wrist-worn form factor. IC Role / Device Role / Timing Role: Low-noise 4.5 V rail for analog signal chain and MCU I/O domain. Use Value: Ultra-low dropout preserves headroom from coin-cell (3.0 V min); BYPASS pin reduces photodiode amplifier offset drift; SOT-23-5 footprint saves PCB area. |
| Industrial Handheld Scanners | Smart Home Sensor Hubs |
Use Scenario: Barcode scanner with laser diode driver, image sensor, and Wi-Fi MCU operating on rechargeable Li-ion. IC Role / Device Role / Timing Role: Main 4.5 V supply for imaging pipeline and wireless interface. Use Value: 575 mV max dropout at –40°C ensures reliable startup in cold warehouses; ON/OFF pin synchronizes with scan trigger to cut idle power. |
Use Scenario: Multi-sensor hub (temp/humidity/PIR) with Zigbee SoC and EEPROM, powered by AA batteries. IC Role / Device Role / Timing Role: Primary regulated rail enabling simultaneous sensor readout and radio transmit. Use Value: 75 µA quiescent current at light load extends 2-year battery life; 1% output accuracy maintains sensor calibration integrity across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-4502E/TT | 300 mA rated, 6 µA quiescent current (active), no BYPASS pin, 2% output tolerance. | Lacks low-noise capability; better suited for digital-only rails where noise is not critical. | Select when higher output current is needed and noise sensitivity is low; requires different layout due to no BYPASS function. |
| TLC7705IPK | 5 V output only, 10 µA quiescent current, no ON/OFF control, 2% tolerance, SOIC-8 package. | Not pin-compatible; larger footprint; lacks enable and low-noise features. | Consider only for legacy designs requiring SOIC packaging and where enable/shutdown is handled externally. |
Compared with MCP1700T-4502E/TT and TLC7705IPK, the LP2985IM5-4.5 uniquely combines 4.5 V precision output, BYPASS-enabled 30 µVRMS noise, and sub-1 µA shutdown in a space-constrained SOT-23-5 package - making it optimal for next-generation portable analog-intensive systems.
Availability
LP2985IM5-4.5 is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld scanners, and smart home sensor hubs requiring stable component supply, long-lifecycle support, and consistent parametric performance.
Supply support for LP2985IM5-4.5 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in high-reliability components.
The LP2985-N series was developed specifically for battery-powered portable electronics, emphasizing micropower operation, ultra-low dropout, and low-noise performance in minimal-footprint packages like SOT-23-5.
FAQ
What is the minimum input voltage required for LP2985IM5-4.5 to regulate 4.5 V at 150 mA?
The LP2985IM5-4.5 requires a minimum input voltage of 4.78 V (4.5 V + 280 mV typical dropout) to maintain regulation at 150 mA and 25°C. Over temperature, the maximum dropout rises to 575 mV, so VIN ≥ 5.075 V is recommended for full-range operation. The datasheet specifies 3.1 V as absolute minimum VIN, but that applies only at lighter loads.
Can LP2985IM5-4.5 operate without the BYPASS capacitor?
Yes, LP2985IM5-4.5 functions normally without the BYPASS capacitor, delivering 4.5 V output with standard LDO performance. However, omitting the 10 nF capacitor increases output noise to ~120 µVRMS. The BYPASS pin is optional for noise-critical applications but does not affect regulation stability or basic functionality.
Is LP2985IM5-4.5 compatible with ceramic output capacitors below 2.2 µF?
No - the LP2985IM5-4.5 requires a minimum 2.2 µF ceramic output capacitor for guaranteed stability across all load and temperature conditions. Using smaller values risks oscillation or poor transient response. Capacitance may be increased without limit, and ESR must remain ≤5 mΩ per the datasheet's stability curve.
What happens to the output when the ON/OFF pin is left floating?
If the ON/OFF pin is left floating, the LP2985IM5-4.5 enters an undefined state due to lack of defined logic level. The device may partially enable or oscillate, causing erratic output behavior and potential overstress. TI explicitly requires active termination: tie to VIN for always-on operation or drive with a controlled logic signal.
Does LP2985IM5-4.5 support reverse input-output voltage protection?
No, LP2985IM5-4.5 does not include reverse polarity protection. The internal PNP structure contains a parasitic diode from IN to OUT; applying VOUT > VIN forward-biases this diode, causing uncontrolled current flow and possible damage. External protection (e.g., series Schottky) is required in systems where output voltage may exceed input.
LP2985IM5-4.5 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):
- 4.5V
- 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
LP2985IM5-4.5 FAQ
1.How can I place an order for LP2985IM5-4.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2985IM5-4.5 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 LP2985IM5-4.5 reliable?
The price and inventory of LP2985IM5-4.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2985IM5-4.5 is usually 5 days.
3.What payment methods are accepted for LP2985IM5-4.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2985IM5-4.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2985IM5-4.5?
LP2985IM5-4.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2985IM5-4.5 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 LP2985IM5-4.5?
For technical support, including LP2985IM5-4.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2985IM5-4.5 requirements.
6.How does Aetrix verify that LP2985IM5-4.5 is sourced from the original manufacturer or authorized distributors?
All LP2985IM5-4.5 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 LP2985IM5-4.5 meets industry standards.
7.What is the process for return or replacement of LP2985IM5-4.5?
All LP2985IM5-4.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP2985IM5-4.5, 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 LP2985IM5-4.5 part is unused and in its original packaging.
Return procedure for LP2985IM5-4.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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