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Analog Devices Inc. LT3015EDD-15#PBF
- Part No.:
- LT3015EDD-15#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3015EDD-15#PBF.pdf
- Description:
- IC REG LINEAR -15V 1.5A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:119
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Product details
Overview
LT3015EDD-15#PBF from Analog Devices (formerly Linear Technology) is a fixed-output, negative low-dropout linear regulator delivering –15V 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 supply rails for instrumentation amplifiers and analog signal chains.
For engineers reviewing the LT3015EDD-15#PBF datasheet, LT3015EDD-15#PBF pinout, LT3015EDD-15#PBF application, or LT3015EDD-15#PBF equivalent, key selection criteria include guaranteed –15V output accuracy (±2%), thermal hysteresis protection, reverse output protection, ceramic capacitor stability (≥10µF), and compatibility with wide input range (–1.8V to –30V).
Technical Context
The LT3015EDD-15#PBF implements a PNP-based negative LDO architecture with precision current limit foldback activated above |VIN – VOUT| = 8V and internal thermal shutdown with hysteresis. Its reference is internally trimmed to –1.22V, enabling fixed –15V output via internal resistor divider.
It operates across –40°C to 125°C junction temperature, maintains controlled quiescent current in dropout (1.1mA typ), and achieves fast transient response due to high loop bandwidth and low output impedance-critical for noise-sensitive analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | –15V ±2% over full load/temperature range; ensures stable bias for op-amps and ADC references. |
| Max Output Current | 1.5A continuous; supports high-current analog subsystems without external boost circuitry. |
| Dropout Voltage | 310mV at 1.5A (DFN package); enables operation with only –15.31V input for full regulation. |
| Output Noise | 60µVRMS (10Hz–100kHz); meets low-noise requirements for precision data acquisition and RF biasing. |
| Quiescent Current | 1.1mA typical in regulation; drops to <1µA in shutdown-enables ultra-low-power standby modes. |
| Input Voltage Range | –1.8V to –30V; accommodates wide-range negative supplies including switched-capacitor inverters and transformer-derived rails. |
| Capacitor Stability | Stable with ≥10µF ceramic output capacitor; eliminates need for ESR-tuned tantalum or aluminum electrolytics. |
Pinout & Package
LT3015EDD-15#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 count and layout match industry-standard DFN-8 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, IN | Input voltage connection | All five IN pins are electrically common and tied to exposed thermal pad; must be soldered to large copper area for θJA = 40°C/W. |
| 5, SHDN | Shutdown control input | Active-low logic: < –1.2V (off), > 1.07V (on); supports both positive and negative shutdown signaling. |
| 6, SENSE | Output voltage sense feedback | Connects directly to regulated –15V output; enables accurate remote sensing and load regulation compensation. |
| 7, 8, GND | Ground reference | Three dedicated GND pins reduce ground bounce and improve PSRR in high-dI/dt conditions. |
| 9, OUT | Regulated negative output | Delivers –15V at up to 1.5A; requires ≥10µF ceramic capacitor on this node for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Precision current limit with foldback | 2.0A nominal limit dropping to ~1.7A at |VIN – VOUT| ≥ 8V-prevents thermal runaway during overvoltage faults. |
| Reverse output protection | Blocks reverse current flow from OUT to IN during power sequencing or fault conditions-protects upstream supplies. |
| Thermal limit with hysteresis | Shuts down at 125°C junction and restarts at ~110°C-avoids oscillatory shutdown in sustained overload. |
| Low-noise architecture | 60µVRMS noise + integrated feed-forward capacitor (CFF) support-enables clean bias for RF mixers and PLL VCOs. |
| Ceramic capacitor compatibility | No ESR requirement; allows use of small, reliable, low-ESR MLCCs-reduces board space and improves reliability vs. electrolytics. |
Applications
| Instrumentation Amplifier Bias Supply | Industrial Process Control Loop |
|---|---|
Use Scenario: Providing dual-rail ±15V bias to precision instrumentation amplifiers (e.g., LT1167, AD8421) in weigh scales and sensor signal conditioners. IC Role / Device Role / Timing Role: Negative rail LDO delivering stable –15V with <60µVRMS noise and <0.5% load regulation error. Use Value: Enables 120dB CMRR and sub-1µV offset drift by eliminating switching noise coupling into sensitive analog inputs. | Use Scenario: Powering 4–20mA transmitter circuits in hazardous-area field devices where EMC immunity and long-term stability are critical. IC Role / Device Role / Timing Role: Post-regulator for isolated DC/DC-derived negative supply, rejecting ripple from upstream flyback converters. Use Value: 52dB ripple rejection at 120Hz and thermal hysteresis ensure uninterrupted 4–20mA loop operation under ambient temperature swings from –40°C to +85°C. |
| Medical Imaging Front-End | Test & Measurement Equipment |
Use Scenario: Supplying low-noise bias to photodiode transimpedance amplifiers and ADC drivers in portable ultrasound receivers. IC Role / Device Role / Timing Role: Fixed –15V LDO with fast transient response (<10µs recovery) and <1µA shutdown current. Use Value: Maintains baseline integrity during pulsed echo reception and enables battery-powered operation with multi-day standby life. | Use Scenario: Generating calibrated negative reference rails for digital multimeters and arbitrary waveform generators requiring traceable voltage accuracy. IC Role / Device Role / Timing Role: Precision –15V source with ±2% output tolerance and <10mV load regulation-used in metrology-grade calibration paths. Use Value: Eliminates need for external trimming resistors and reduces calibration drift over 10-year product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar negative LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3015EMSE-15#PBF | Same electrical specs but in 12-lead MSOP package; higher θJA (37°C/W) and no exposed IN pad. | Suitable for space-constrained layouts where DFN thermal pad routing is impractical; lower max power dissipation at same ambient. | Select when PCB assembly process favors MSOP or when thermal pad soldering is not feasible. |
| LT3015ET-15#PBF | Identical specs in TO-220 package; θJA = 50°C/W; larger footprint and through-hole mounting. | Better suited for prototyping, high-reliability industrial systems, or environments requiring mechanical robustness and airflow cooling. | Select for manual assembly, high-vibration environments, or legacy designs using TO-220 footprints. |
Compared with LTC3015EMSE-15#PBF and LT3015ET-15#PBF, the LT3015EDD-15#PBF offers superior thermal performance (θJA = 40°C/W) and smallest PCB footprint, making it optimal for compact, high-power-density analog modules where thermal management via PCB copper is preferred over heatsinks or airflow.
Availability
LT3015EDD-15#PBF is available at Aetrix Electronics and suitable for industrial process control, medical imaging front-ends, and test & measurement equipment requiring stable component supply, long lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LT3015EDD-15#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 full product continuity, documentation, and support for all LT-branded ICs including the LT3015 series.
The LT3015 series was designed specifically for high-performance negative rail regulation in noise-critical analog systems-emphasizing low dropout, ultra-low noise, and robust fault protection without external components.
FAQ
What is the guaranteed output voltage tolerance for LT3015EDD-15#PBF over temperature and load?
The LT3015EDD-15#PBF guarantees –15V output within ±2% over the full –40°C to 125°C junction temperature range and across 1mA to 1.5A load current. This is confirmed in the Electrical Characteristics table (Page 5), where min/max values are –14.7V and –15.3V at rated conditions.
Does LT3015EDD-15#PBF require an external feed-forward capacitor (CFF) to achieve its specified 60µVRMS noise?
No-LT3015EDD-15#PBF achieves 60µVRMS output noise (10Hz–100kHz) with only a 10µF ceramic output capacitor. A feed-forward capacitor (CFF) is optional and used only to further reduce noise at specific frequencies (e.g., 10nF CFF lowers noise at VOUT = –5V per Figure 3015 G45), but it is not required for the base 60µVRMS spec.
Can LT3015EDD-15#PBF operate with an input voltage of –16V while delivering 1.5A?
Yes-LT3015EDD-15#PBF supports input voltages from –1.8V to –30V. At –16V input and –15V output, the differential is 1V, well above the 310mV typical dropout voltage. The device remains fully regulated and delivers full 1.5A with <10mV load regulation error per datasheet Table (Page 5).
How is thermal performance affected if the exposed IN pad (Pin 9) on LT3015EDD-15#PBF is not soldered to the PCB?
If the exposed IN pad (Pin 9) is not soldered, θJA degrades significantly-from 40°C/W (specified) to >100°C/W-causing excessive junction temperature rise at 1.5A. This risks thermal shutdown or long-term reliability failure. The datasheet explicitly states "EXPOSED PAD (PIN 9) IS IN, MUST BE SOLDERED TO PCB" (Page 2).
Is LT3015EDD-15#PBF compatible with standard lead-free reflow profiles?
Yes-LT3015EDD-15#PBF uses a lead-free finish and is qualified for standard JEDEC J-STD-020D reflow profiles. The maximum peak temperature is 260°C for 20–40 seconds, matching the 300°C MS12E package rating cited in Absolute Maximum Ratings (Page 2). No special thermal ramping is required.
LT3015EDD-15#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):
- -15V
- 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:
- 50dB (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-15#PBF FAQ
1.How can I place an order for LT3015EDD-15#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3015EDD-15#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-15#PBF reliable?
The price and inventory of LT3015EDD-15#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-15#PBF is usually 5 days.
3.What payment methods are accepted for LT3015EDD-15#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3015EDD-15#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3015EDD-15#PBF?
LT3015EDD-15#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3015EDD-15#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-15#PBF?
For technical support, including LT3015EDD-15#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3015EDD-15#PBF requirements.
6.How does Aetrix verify that LT3015EDD-15#PBF is sourced from the original manufacturer or authorized distributors?
All LT3015EDD-15#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-15#PBF meets industry standards.
7.What is the process for return or replacement of LT3015EDD-15#PBF?
All LT3015EDD-15#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3015EDD-15#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-15#PBF part is unused and in its original packaging.
Return procedure for LT3015EDD-15#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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