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Analog Devices Inc. LT3015EDD-12#PBF
- Part No.:
- LT3015EDD-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3015EDD-12#PBF.pdf
- Description:
- IC REG LINEAR -12V 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
LT3015EDD-12#PBF from Analog Devices (formerly Linear Technology) is a fixed-output, negative low-dropout linear regulator delivering –12V at up to 1.5A with 310mV typical dropout voltage, 60µVRMS output noise (10Hz–100kHz), and <1µA shutdown quiescent current. It serves as a precision post-regulator in bipolar power supplies for instrumentation and industrial control systems.
For engineers reviewing the LT3015EDD-12#PBF datasheet, LT3015EDD-12#PBF pinout, LT3015EDD-12#PBF application, or LT3015EDD-12#PBF equivalent, key selection criteria include guaranteed –12V output accuracy (±2%), thermal-hysteretic protection, reverse output protection, fast transient response, and compatibility with 10µF ceramic output capacitors without ESR requirements.
Technical Context
The LT3015EDD-12#PBF employs a PNP pass transistor architecture optimized for negative regulation, enabling stable operation with input voltages from –1.8V to –30V and maintaining precise –12V output across load currents from –1mA to –1.5A. Its internal reference is trimmed to ±1% over temperature, and the current-limit foldback activates when |VIN – VOUT| ≥ 8V.
Quiescent current remains tightly controlled in dropout (1.1mA typ.) and drops below 1µA in shutdown, while GND pin current scales predictably with load (35mA max at –1.5A). The device achieves 43dB ripple rejection at 120Hz under full load and operates reliably from –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed –12V, ±2% tolerance over temperature and load ensures stable bias for op-amps and ADCs. |
| Max Output Current | 1.5A continuous, supporting high-current analog subsystems without external heat sinking in DFN package. |
| Dropout Voltage | 310mV typical at 1.5A, enabling regulation from –12.31V input - critical for tight negative rail margins. |
| Output Noise | 60µVRMS (10Hz–100kHz), low enough for precision data acquisition front-ends and low-noise amplifiers. |
| Quiescent Current | 1.1mA typical in operation; <1µA in shutdown - extends battery life in portable dual-rail systems. |
| Stability | Stable with ≥10µF ceramic output capacitor; no ESR requirement simplifies layout and reduces BOM count. |
| Ripple Rejection | 43dB at 120Hz, effectively suppressing switching noise from upstream DC/DC converters. |
Pinout & Package
LT3015EDD-12#PBF is housed in an 8-lead 3mm × 3mm × 0.75mm plastic DFN package with exposed IN pad (Pin 9) requiring PCB soldering for thermal performance. Pin 6 functions as SENSE for fixed-output variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1,2,3,4) | Negative Input Supply | Four paralleled pins reduce resistance and inductance; exposed pad (Pin 9) must be soldered to IN copper for thermal and electrical integrity. |
| SHDN (Pin 5) | Shutdown Control | Active-low logic input; –1.34V threshold enables direct interface with microcontroller GPIO or comparator outputs. |
| GND (Pin 6) | Ground Reference | Low-impedance return path for feedback and bias circuits; separate from IN to support Kelvin sensing in adjustable variants. |
| OUT (Pins 7,8) | Negative Regulated Output | Dual pins minimize IR drop and improve current sharing; connects directly to load and output capacitor. |
| SENSE (Pin 6) | Output Voltage Sense | For fixed-output versions like LT3015EDD-12#PBF, this pin monitors OUT to maintain regulation accuracy independent of trace resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Precision current limit with foldback | 2A typical limit at |VIN – VOUT| < 8V, decreasing gradually beyond that to prevent thermal runaway during overvoltage faults. |
| Reverse output protection | Internal circuitry blocks reverse current flow from OUT to IN, protecting downstream circuitry during power sequencing or fault conditions. |
| Thermal limit with hysteresis | Shuts down at 125°C junction temperature and restarts only after cooling by ≥15°C, preventing oscillatory shutdown in sustained overload. |
| Controlled quiescent current in dropout | Maintains 1.1mA IQ even when VIN approaches VOUT + dropout, ensuring predictable power budgeting in brownout scenarios. |
| Wide input voltage range | Operates from –1.8V to –30V, allowing use with diverse negative sources including transformer-derived rails and switched-capacitor inverters. |
Applications
| Industrial Process Control | High-Precision Data Acquisition |
|---|---|
Use Scenario: Powering dual-supply instrumentation amplifiers and 24-bit sigma-delta ADCs in PLC analog I/O modules. IC Role / Device Role / Timing Role: Negative rail regulator providing clean –12V bias for signal conditioning stages. Use Value: 60µVRMS noise and 43dB ripple rejection preserve SNR in sub-100µV resolution measurements. |
Use Scenario: Biasing op-amps and reference buffers in portable multimeters and calibration equipment. IC Role / Device Role / Timing Role: Low-quiescent, shutdown-capable negative regulator enabling battery-powered dual-rail operation. Use Value: <1µA shutdown current extends shelf life and runtime; DFN package supports compact handheld form factors. |
| Post-Regulation for Switching Supplies | Negative Complement to LT1963A |
Use Scenario: Filtering residual ripple from –12V buck-boost or inverting switchers in telecom line cards. IC Role / Device Role / Timing Role: Low-noise LDO post-regulator improving PSRR and transient response of switching-derived rails. Use Value: Fast transient response and 10µF ceramic stability eliminate need for bulky electrolytic hold-up capacitors. |
Use Scenario: Providing matched –12V rail alongside LT1963A's +12V output in symmetrical analog supply designs. IC Role / Device Role / Timing Role: Pin-compatible negative counterpart enabling balanced rail design with identical thermal and noise profiles. Use Value: Identical 1.5A rating, 310mV dropout, and DFN footprint simplify layout reuse and thermal management across both rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3015IMSE-12#PBF | Same electrical specs; 12-lead MSOP package with higher θJA (37°C/W) and extended –40°C to 125°C temp grade. | Better thermal performance in forced-air environments; larger footprint limits ultra-dense layouts. | Select when board space allows larger package and enhanced thermal derating is required. |
| LT3015ET-12#PBF | Same electrical specs; TO-220 package with θJA = 50°C/W and integral heat sink tab. | Higher power dissipation capability at cost of size and manual assembly; requires mechanical mounting. | Select for high-ambient industrial enclosures where heatsinking is feasible and DFN reflow is constrained. |
Compared with LT3015IMSE-12#PBF and LT3015ET-12#PBF, the LT3015EDD-12#PBF offers the smallest footprint (3mm × 3mm), lowest profile (0.75mm), and best thermal resistance in reflow-soldered applications (θJA = 40°C/W), making it optimal for space-constrained, high-volume PCB assemblies.
Availability
LT3015EDD-12#PBF is available at Aetrix Electronics and suitable for industrial process control, high-precision data acquisition, and post-regulation for switching supplies requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.
Supply support for LT3015EDD-12#PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains its legacy of high-performance analog ICs with rigorous characterization and automotive/industrial qualification.
The LT3015 series was designed specifically for noise-sensitive negative rail applications demanding low dropout, fast transient response, and robust protection - targeting instrumentation, test equipment, and industrial control systems.
FAQ
What is the output voltage tolerance of the LT3015EDD-12#PBF over temperature and load?
The LT3015EDD-12#PBF delivers –12V with ±2% output voltage tolerance across the full –40°C to 125°C operating junction temperature range and load currents from –1mA to –1.5A. This is verified per the datasheet's regulated output voltage specification for LT3015-12 variants, ensuring reliable biasing for precision analog components without external trimming.
Does the LT3015EDD-12#PBF require an external resistor divider for regulation?
No - the LT3015EDD-12#PBF is a fixed-output variant with internal feedback, so no external resistor divider is needed. Pin 6 functions as SENSE (not ADJ), directly monitoring the OUT pin to maintain regulation accuracy. This eliminates component count, layout sensitivity, and drift associated with external resistors.
Can the LT3015EDD-12#PBF operate with a –12.1V input voltage?
Yes - with a –12.1V input, the LT3015EDD-12#PBF maintains regulation as long as the input-to-output differential exceeds the dropout voltage. At 1.5A, typical dropout is 310mV, so minimum input is –12.31V. A –12.1V input provides 100mV headroom and places the device in dropout; however, output voltage will follow VIN + VDROPOUT (≈ –12.0V), not regulated –12V.
What capacitor types are compatible with the LT3015EDD-12#PBF?
The LT3015EDD-12#PBF is stable with ≥10µF ceramic, tantalum, or aluminum electrolytic capacitors on the output. Unlike many LDOs, it does not require added ESR, eliminating the need for damping resistors or specialized capacitors - ceramic MLCCs are fully sufficient and recommended for low-profile, high-reliability designs.
How does the shutdown function work on the LT3015EDD-12#PBF?
The LT3015EDD-12#PBF features precision negative logic shutdown: applying ≤ –1.34V to SHDN (Pin 5) disables regulation and reduces quiescent current to <1µA. The threshold is specified with hysteresis to prevent chatter near the transition point, and SHDN can be driven directly from microcontroller I/O or comparator outputs without level-shifting circuitry.
LT3015EDD-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Negative
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -30V
- Voltage - Output (Min/Fixed):
- -12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 2.4 mA
- Current - Supply (Max):
- 70 mA
- PSRR:
- 53dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT3015EDD-12#PBF FAQ
1.How can I place an order for LT3015EDD-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3015EDD-12#PBF 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 LT3015EDD-12#PBF reliable?
The price and inventory of LT3015EDD-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3015EDD-12#PBF is usually 5 days.
3.What payment methods are accepted for LT3015EDD-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3015EDD-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3015EDD-12#PBF?
LT3015EDD-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3015EDD-12#PBF 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 LT3015EDD-12#PBF?
For technical support, including LT3015EDD-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3015EDD-12#PBF requirements.
6.How does Aetrix verify that LT3015EDD-12#PBF is sourced from the original manufacturer or authorized distributors?
All LT3015EDD-12#PBF 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 LT3015EDD-12#PBF meets industry standards.
7.What is the process for return or replacement of LT3015EDD-12#PBF?
All LT3015EDD-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3015EDD-12#PBF, 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 LT3015EDD-12#PBF part is unused and in its original packaging.
Return procedure for LT3015EDD-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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