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Analog Devices Inc. LT3015IMSE-15#PBF
- Part No.:
- LT3015IMSE-15#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3015IMSE-15#PBF.pdf
- Description:
- IC REG LINEAR -15V 1.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LT3015IMSE-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 power supplies for instrumentation and industrial control systems.
For engineers reviewing the LT3015IMSE-15#PBF datasheet, LT3015IMSE-15#PBF pinout, LT3015IMSE-15#PBF application, or LT3015IMSE-15#PBF equivalent, key selection criteria include guaranteed –15V output accuracy over –40°C to 125°C, thermal-hysteresis protection, reverse output protection, and compatibility with 10µF ceramic output capacitors without ESR requirements.
Technical Context
The LT3015IMSE-15#PBF employs a precision bandgap reference and high-gain error amplifier to maintain tight output regulation across load (–1mA to –1.5A) and line (–16V to –30V input) variations. Its internal foldback current limit activates at |VIN – VOUT| ≥ 8V, protecting against overload while sustaining partial current delivery.
Designed for noise-sensitive analog circuits, it integrates low-noise biasing and optimized internal compensation to achieve 60µVRMS integrated noise and >50dB ripple rejection at 120Hz - critical for ADC references and op-amp bias rails in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed –15V, ±1% tolerance over full temperature range ensures stable bias for dual-rail op-amps and DACs. |
| Max Output Current | 1.5A continuous, enabling direct powering of high-current analog subsystems without external pass devices. |
| Dropout Voltage | 310mV typical at 1.5A (DFN/MSOP package), allowing operation with only 0.31V headroom above –15V output. |
| Output Noise | 60µVRMS (10Hz–100kHz), minimizing phase noise in RF local oscillators and quantization noise in precision data converters. |
| Quiescent Current | 1.1mA typical in regulation; drops to <1µA in shutdown, supporting ultra-low-power standby modes. |
| Input Voltage Range | –1.8V to –30V, permitting use with standard –18V or –24V industrial rails and switcher outputs. |
| Stability | Stable with ≥10µF ceramic output capacitor; no ESR requirement simplifies layout and improves reliability. |
Pinout & Package
LT3015IMSE-15#PBF is housed in a thermally enhanced 12-lead MSOP package (3mm × 4mm, 0.75mm height) with exposed IN pad for improved thermal performance. Pin 13 (exposed pad) must be soldered to PCB ground plane or IN copper for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,3,4,5,12 | IN | Input supply connection; all six pins tied internally to exposed pad - requires low-impedance routing to negative rail. |
| 6,7,11 | OUT | Regulated –15V output; multiple pins reduce IR drop and improve current sharing in high-load applications. |
| 8 | SENSE | Feedback sense point for remote sensing; connects directly to load to compensate for PCB trace resistance. |
| 9 | GND | Analog ground reference; separate from IN and OUT paths to minimize noise coupling into regulation loop. |
| 10 | SHDN | Active-low shutdown control; logic threshold –1.2V to –1.34V (off-to-on), compatible with standard CMOS/LVTTL negative logic. |
Key Features
| Feature | Design Value |
|---|---|
| Precision current limit with foldback | 2.0A nominal limit decreasing above |VIN – VOUT| = 8V, preventing thermal runaway during short-circuit or overvoltage fault conditions. |
| Reverse output protection | Internal diode blocks reverse current flow from OUT to IN, eliminating need for external blocking diodes in battery backup or hot-swap designs. |
| Controlled quiescent current in dropout | GND pin current remains stable (<35mA at –1.5A) even when VIN approaches VOUT, ensuring predictable thermal behavior during brownout. |
| Thermal limit with hysteresis | Shuts down at TJ = 125°C and restarts at ~110°C, preventing cycling and enabling safe recovery after transient overloads. |
| Low-noise architecture | 60µVRMS noise and 55dB ripple rejection at 120Hz enable clean power for 16-bit+ SAR ADCs and low-phase-noise PLLs. |
Applications
| Post-Regulator for Switching Supplies | Negative Logic Supplies |
|---|---|
Use Scenario: Clean –15V rail derived from a noisy –18V buck converter output in an automated test equipment (ATE) mainframe. IC Role / Device Role / Timing Role: Final-stage LDO providing low-noise, tightly regulated –15V to high-speed comparators and level-shifting interfaces. Use Value: Reduces switching ripple by >50dB at 120Hz and suppresses broadband noise to 60µVRMS, improving measurement accuracy by >2 LSB in 16-bit digitizers. | Use Scenario: Dual-rail power for industrial PLC I/O modules requiring isolated –15V for RS-485 transceivers and analog input conditioning. IC Role / Device Role / Timing Role: Primary negative supply generating –15V from a shared –24V intermediate bus with precise shutdown sequencing. Use Value: <1µA shutdown current enables zero-power state during system sleep; reverse output protection prevents backfeed during hot-plug insertion. |
| Low Noise Instrumentation | Industrial Supplies |
Use Scenario: Bias supply for low-noise JFET-input op-amps in portable spectrum analyzers and medical EEG front-ends. IC Role / Device Role / Timing Role: Ultra-low-noise –15V source referenced to signal ground, decoupled via 10µF ceramic capacitor. Use Value: 60µVRMS noise contributes <0.002% THD+N to signal chain, preserving dynamic range in sub-100nV/√Hz sensor amplifiers. | Use Scenario: Fixed –15V rail in motor drive control boards powering gate drivers and isolated feedback circuitry. IC Role / Device Role / Timing Role: Robust negative supply tolerant of –30V transients and capable of 1.5A peak current during PWM bursts. Use Value: Thermal hysteresis and foldback current limit prevent latch-up during IGBT shoot-through faults; 125°C max junction rating supports convection-cooled enclosures. |
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 silicon, E-grade (0°C to 125°C) vs I-grade (–40°C to 125°C); identical electrical specs and pinout. | Not rated for –40°C startup; unsuitable for outdoor or automotive under-hood deployments. | Select when ambient operating temperature stays above 0°C and cost sensitivity outweighs extended temp coverage. |
| LT3015IDD-15#PBF | Same –15V output and 1.5A rating but in 8-lead 3mm × 3mm DFN package; slightly higher dropout (390mV typ at 1.5A). | Lower thermal resistance (θJA = 40°C/W vs 37°C/W) but smaller footprint; less copper area for IN pad soldering. | Choose for space-constrained layouts where 0.08V higher dropout is acceptable and thermal margin allows reduced heatsinking. |
Compared with LTC3015EMSE-15#PBF and LT3015IDD-15#PBF, the LT3015IMSE-15#PBF provides guaranteed –40°C operation and optimal thermal performance in the MSOP package - essential for industrial environments with wide ambient swings and sustained 1.5A loads.
Availability
LT3015IMSE-15#PBF is available at Aetrix Electronics and suitable for industrial automation, test & measurement equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LT3015IMSE-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 its legacy of high-performance analog ICs with rigorous process control and application-focused design.
The LT3015 series was developed specifically for demanding negative-rail applications where low noise, fast transient response, and robust protection are mandatory - targeting precision instrumentation, industrial control, and communications infrastructure.
FAQ
What is the guaranteed output voltage tolerance for LT3015IMSE-15#PBF over temperature?
The LT3015IMSE-15#PBF delivers –15V with ±1% output voltage tolerance across the full –40°C to 125°C operating junction temperature range, verified per datasheet Section 5 (Electrical Characteristics) for the I-grade MSOP variant. This ensures consistent biasing for precision analog circuits without recalibration.
Can LT3015IMSE-15#PBF operate with a –16V input and still regulate at full 1.5A load?
Yes. With a –16V input, the LT3015IMSE-15#PBF maintains regulation at 1.5A because its typical dropout voltage is 310mV (well below the 1V differential). The datasheet confirms stable operation down to –16V input for the –15V version, and thermal limits remain within spec at TJ ≤ 125°C with proper PCB copper area on the exposed IN pad.
Does LT3015IMSE-15#PBF require an external resistor divider for fixed –15V output?
No. The LT3015IMSE-15#PBF is a factory-trimmed fixed-output device; no external resistors are needed. The SENSE pin (Pin 8) connects directly to the load for remote sensing, while the internal reference and feedback network are laser-trimmed to deliver –15V ±1% without user adjustment.
How does the shutdown function of LT3015IMSE-15#PBF interface with standard digital logic?
The SHDN pin (Pin 10) uses precision negative logic: device turns ON when SHDN voltage falls below –1.2V (typical off-to-on threshold) and turns OFF when SHDN rises above –0.73V (typical on-to-off threshold). This matches standard LVCMOS or open-collector driver outputs referenced to the negative rail, enabling direct microcontroller control without level-shifting.
Is LT3015IMSE-15#PBF stable with a 10µF X7R ceramic capacitor on the output?
Yes. The LT3015IMSE-15#PBF is explicitly characterized and guaranteed stable with ≥10µF ceramic output capacitors (X5R/X7R), including zero-ESR types. Unlike many older LDOs, it does not require added ESR or tantalum/aluminum electrolytics - simplifying BOM and improving reliability in vibration-prone industrial settings.
LT3015IMSE-15#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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:
- 12-MSOP-EP
LT3015IMSE-15#PBF FAQ
1.How can I place an order for LT3015IMSE-15#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3015IMSE-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 LT3015IMSE-15#PBF reliable?
The price and inventory of LT3015IMSE-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 LT3015IMSE-15#PBF is usually 5 days.
3.What payment methods are accepted for LT3015IMSE-15#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3015IMSE-15#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3015IMSE-15#PBF?
LT3015IMSE-15#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3015IMSE-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 LT3015IMSE-15#PBF?
For technical support, including LT3015IMSE-15#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3015IMSE-15#PBF requirements.
6.How does Aetrix verify that LT3015IMSE-15#PBF is sourced from the original manufacturer or authorized distributors?
All LT3015IMSE-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 LT3015IMSE-15#PBF meets industry standards.
7.What is the process for return or replacement of LT3015IMSE-15#PBF?
All LT3015IMSE-15#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3015IMSE-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 LT3015IMSE-15#PBF part is unused and in its original packaging.
Return procedure for LT3015IMSE-15#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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