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Texas Instruments LP2985-33DBVR
- Part No.:
- LP2985-33DBVR
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Description:
- IC REG LINEAR 3.3V 150MA SOT23-5
- Quantity:
Unit Price:$0
Ext Price:$0
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Product Details
LP2985-33DBVR - 3.3 V, 150 mA Low-Noise LDO
Texas Instruments LP2985-33DBVR is a fixed 3.3 V low-dropout regulator with enable control, rated for up to 150 mA in a 5-pin SOT-23 DBV package.
Electrical limits, pin functions, package data, and exact orderable status were checked against the official TI LP2985 Rev. S datasheet and part-detail page.
Overview
LP2985-33DBVR provides a fixed 3.3 V rail from a wide input supply and supports loads up to 150 mA. A dedicated ON/OFF input, optional noise-bypass capacitor, current limiting, and thermal protection support compact low-noise power designs.
Key Advantages
Fixed 3.3 V rail
The voltage suffix identifies a factory-set 3.3 V output for processor, sensor, and analog loads.
Low-noise operation
A 10 nF bypass capacitor enables approximately 30 microvolts RMS typical output noise.
Wide input range
The current design supports recommended input operation from 2.5 V to 16 V.
Controlled shutdown
The active-high ON/OFF input disables internal circuitry and supports output discharge on the new design.
Feature Summary
150 mA output
Designed to source up to 150 mA over the recommended operating range.
High rejection
The new design provides typical PSRR above 70 dB at 1 kHz and 40 dB at 1 MHz.
Integrated protection
Output-current limiting and overtemperature protection are built in.
Compact solution
The DBV SOT-23-5 package measures approximately 2.9 mm by 2.8 mm including leads.
Package & Footprint
TI specifies LP2985-33DBVR in the 5-pin SOT-23 DBV package. The catalog names SC-74A and SOT-753 refer to this five-lead package family. Use the current DBV mechanical drawing for land-pattern and orientation details.
- Follow TI's DBV top-view numbering and pin-1 indicator.
- Place the input and output capacitors close to their pins and ground.
- Route BYPASS away from switching nodes and noisy traces.
- Evaluate temperature rise using the actual copper layout and airflow.
The registered JPG is checked locally and at the production URL before publication.
Pin Functions
The DBV assignment follows the official TI top-view diagram.
Do not leave ON/OFF unconnected, and do not infer this pin order from another SOT-23-5 regulator.
Key Specifications
| Manufacturer | Texas Instruments |
|---|---|
| Regulator type | Fixed positive low-dropout linear regulator |
| Nominal output | 3.3 V |
| Recommended input supply | 2.5 V to 16 V for new silicon; maintain required headroom above 3.3 V |
| Output current | 0 to 150 mA recommended |
| Output accuracy | New silicon: plus or minus 0.5 percent at 25 degrees C and plus or minus 1 percent across load and operating temperature |
| Dropout at 150 mA | New silicon: 180 mV typical, 198 mV maximum at 25 degrees C, 254 mV maximum over temperature |
| Ground current at no load | New silicon: 69 microamps typical, 95 microamps maximum at 25 degrees C |
| Shutdown current | Silicon-dependent; consult the package marking and Rev. S limits |
| Output noise | 30 microvolts RMS typical with a 10 nF bypass capacitor |
| Power-supply rejection | New silicon: greater than 70 dB typical at 1 kHz and 40 dB typical at 1 MHz |
| Capacitors | 1 microfarad nominal input; 2.2 microfarads nominal output for new silicon, maintaining at least 1 microfarad effective |
| Operating junction temperature | -40 degrees C to +125 degrees C |
| Protection | Output-current limiting and thermal protection |
| Package | 5-pin SOT-23 DBV / SC-74A / SOT-753; 3000-piece large tape and reel |
Typical values are not guaranteed limits. Identify the silicon version and apply its exact test conditions, derating, and capacitor requirements.
Replacement Considerations
A replacement must match the fixed 3.3 V output, 150 mA requirement, VIN/GND/ON-OFF/BYPASS/VOUT pin order, enable thresholds, dropout, accuracy, capacitor stability range, noise, temperature rating, and SOT-23-5 footprint. A different LP2985 voltage suffix is not a direct substitute.
No internal replacement link is asserted without an exact API-confirmed catalog match and engineering review.
Manufacturer Information
Texas Instruments lists LP2985-33DBVR as an active production part. The exact orderable uses the 5-pin SOT-23 DBV package, operates from -40 degrees C to +125 degrees C, ships in 3000-piece large tape and reel, and is RoHS and REACH compliant with MSL 1 at 260 degrees C. TI lists LPFG and LPFL as applicable markings.
Applications
Low-noise analog rails
Supply sensitive signal-chain or converter circuitry from a regulated 3.3 V rail.
Portable equipment
Support battery-powered instruments, cameras, and communication devices.
Embedded controllers
Power microcontrollers, sensors, and interfaces that require a fixed 3.3 V source.
Post-regulation
Reduce switching-supply ripple where input headroom and dissipation permit.
Quality & Authenticity
Verify the complete LP2985-33DBVR order code, LPFG or LPFL marking, DBV dimensions, reel label, moisture-sensitivity information, lead finish, and lot traceability during incoming inspection. The marking is also important for selecting the correct silicon-specific limits.
FAQ
What output does LP2985-33DBVR provide?
It is the fixed 3.3 V, 150 mA DBV orderable in the LP2985 family.
Can ON/OFF be left floating?
No. Drive it to a valid logic level or tie it to VIN when shutdown control is not required.
What is BYPASS used for?
A capacitor from BYPASS to ground reduces reference noise; 10 nF is used for the headline low-noise specification.
What output capacitor is required?
For new silicon, TI specifies 2.2 microfarads nominal and at least 1 microfarad effective at the pin; legacy requirements differ.
Why does the datasheet list two sets of limits?
Rev. S documents legacy and new silicon. Use the device marking and current TI guidance to select the applicable values.
Engineering Notice
Confirm silicon marking, worst-case headroom, load and line tolerance, capacitor effective value and ESR, startup and shutdown behavior, BYPASS timing, and junction temperature in the final design. Do not apply new-silicon limits to legacy-marked material without confirmation.
LP2985-33DBVR Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3.3V
- 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
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