My Inquiry
My Account
Analog Devices Inc. LTC3115MPFE-2#TRPBF
- Part No.:
- LTC3115MPFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115MPFE-2#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,063
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3115MPFE-2#TRPBF from Analog Devices is a high-voltage monolithic synchronous buck-boost DC/DC converter optimized for fast input voltage transients (<1 ms), supporting 2.7V–40V input and output ranges, delivering up to 2A in step-down mode (VIN ≥ 6V), and featuring programmable switching frequency from 100 kHz to 2 MHz. It is used in automotive power systems requiring AEC-Q100-compliant operation across –55°C to 150°C.
For engineers reviewing the LTC3115MPFE-2#TRPBF datasheet, LTC3115MPFE-2#TRPBF pinout, LTC3115MPFE-2#TRPBF application, or LTC3115MPFE-2#TRPBF equivalent, key selection criteria include input transient robustness, wide VIN/VOUT compatibility, ultralow 3 µA shutdown current, Burst Mode® quiescent current of 50 µA, and thermal performance in the 20-lead TSSOP package with exposed PGND pad.
Technical Context
The LTC3115MPFE-2#TRPBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150 mΩ each), enabling seamless transitions between buck, boost, and pass-through modes without output disturbance. Its proprietary voltage-mode control loop uses a 1000 mV feedback reference and supports external synchronization via the PWM/SYNC pin.
It integrates an internal VCC linear regulator (4.45 V nominal output), programmable input UVLO with hysteresis, internal soft-start (9 ms), and overtemperature protection. The device operates across –55°C to 150°C junction temperature, with guaranteed specifications over this full range per MIL-PRF-38535 Class V / MP-grade qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 40 V - supports lead-acid battery, 24 V industrial rail, and unregulated adapters without external pre-regulation. |
| Output Voltage Range | 2.7 V to 40 V - enables single-rail conversion from variable sources (e.g., FireWire, USB PD, automotive cold-crank) to stable system rails. |
| Max Output Current | 2 A in step-down mode (VIN ≥ 6 V) - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor signal chains directly. |
| Switching Frequency | 100 kHz to 2 MHz - adjustable via RT pin resistor; higher frequencies allow smaller magnetics (e.g., 5.2 µH at 2 MHz) for space-constrained designs. |
| Shutdown Current | 3 µA typical - preserves battery life in always-on automotive telematics or remote monitoring nodes during sleep states. |
| Burst Mode Quiescent Current | 50 µA typical - maintains regulation at light loads while minimizing standby loss in battery-backed backup supplies. |
| Feedback Reference Voltage | 1000 mV ±23 mV - sets output voltage via external resistor divider; tight tolerance enables ±1% output accuracy with proper layout. |
| Junction Temperature Range | –55°C to +150°C - qualified to MIL-PRF-38535 Class V; suitable for under-hood automotive, downhole tools, and military avionics. |
Pinout & Package
The LTC3115MPFE-2#TRPBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE) with exposed PGND pad (Pin 21), requiring soldering to PCB ground plane for rated thermal performance (θJA = 38°C/W). Package dimensions: 6.5 mm × 4.4 mm × 1.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1, 10, 11, 20, Exposed Pad (21) | PGND | Power ground return for all switch currents; must be low-impedance connection to PCB ground plane for thermal and EMI performance. |
| PIN 2 | RUN | Enable/disable control and custom UVLO threshold setting; sourcing 0.5 µA hysteresis current when enabled above 1.21 V. |
| PIN 3 | SW2 | Power switch node for boost path; connects to one end of buck-boost inductor and cathode of optional Schottky clamp diode. |
| PIN 4 | PVOUT | Main power output; requires ≥10 µF low-ESR capacitor placed adjacent to IC with short ground return path. |
| PIN 5, 6 | GND | Signal ground for control circuitry; must tie to clean analog ground separate from noisy PGND paths until star-point connection. |
| PIN 7 | VC | Error amplifier output; connects to FB via RC compensation network to stabilize loop response and prevent oscillation. |
| PIN 8 | FB | Feedback input referenced to 1000 mV; resistor divider from PVOUT sets regulated output voltage; sensitive to noise coupling. |
| PIN 9 | RT | Oscillator frequency programming node; resistor to GND sets fSW from 100 kHz to 2 MHz (e.g., 35.7 kΩ → 1 MHz). |
| PIN 12 | VCC | Low-voltage supply for internal logic; must be tied directly to PVCC; bypassed with ≥4.7 µF capacitor to PGND. |
| PIN 13 | VIN | Input voltage sense and VCC regulator input; bypassed with 0.1 µF capacitor; used for UVLO detection and line regulation. |
| PIN 14 | PVCC | VCC regulator output and gate driver supply; must connect directly to VCC; additional local bypass recommended if trace >2 mm. |
| PIN 15 | BST2 | Flying capacitor connection for SW2 gate drive; requires 0.1 µF ceramic capacitor between BST2 and SW2. |
| PIN 16 | BST1 | Flying capacitor connection for SW1 gate drive; requires 0.1 µF ceramic capacitor between BST1 and SW1. |
| PIN 17 | PVIN | Main power input; bypassed with ≥4.7 µF capacitor; bulk capacitance (47–100 µF) recommended for long-trace or high-ESR sources. |
| PIN 18 | SW1 | Power switch node for buck path; connects to other end of buck-boost inductor and anode of optional Schottky clamp diode. |
| PIN 19 | PWM/SYNC | Mode control and sync input; high = fixed-frequency PWM, low = Burst Mode®, external clock = synchronized PWM. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Enables true buck-boost operation with no external diodes; eliminates reverse-current conduction losses in boost mode. |
| Ultralow 3 µA shutdown current | Extends battery runtime in safety-critical automotive modules (e.g., airbag controllers) that require persistent low-power monitoring. |
| Programmable input UVLO with hysteresis | Allows precise brown-in/brown-out thresholds (e.g., 24 V system with 21.5 V lockout and 22.5 V restart) using external resistors on RUN pin. |
| Internal soft-start (9 ms) | Prevents inrush current into output capacitors during power-up; eliminates need for external timing components or sequencing circuits. |
| AEC-Q100 Grade 1 qualified (–40°C to +125°C) and MP-grade extended range | Validated for automotive under-hood applications and high-reliability industrial environments where extended temperature coverage is mandatory. |
| Thermally enhanced TSSOP with exposed PGND pad | Enables 38°C/W θJA in standard 2-layer PCB layout; simplifies thermal design vs. DFN alternatives in high-power density automotive ECUs. |
Applications
| Automotive Start-Stop Systems | Industrial 24 V Rail Regulation |
|---|---|
|
Use Scenario: Maintaining stable 5 V or 12 V supply during engine cranking events where battery voltage dips to 3.6 V for <1 ms. IC Role / Device Role / Timing Role: Primary buck-boost regulator handling fast transients; operates in seamless buck-to-boost transition without output dropout. Use Value: Prevents ECU reset or sensor data loss during cold-crank; meets ISO 16750-2 Pulse 4 requirement without external hold-up capacitance. |
Use Scenario: Converting unregulated 24 V industrial bus (18–32 V) to clean 3.3 V for PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Wide-input DC/DC front-end regulator with integrated UVLO and thermal shutdown. Use Value: Eliminates need for discrete pre-regulator stage; supports continuous operation up to 150°C ambient in enclosed enclosures. |
| FireWire Power Delivery | Backup Power for Real-Time Clocks |
|
Use Scenario: Regulating FireWire 12 V–40 V variable supply to fixed 3.3 V for IEEE 1394 PHY and link layer ICs. IC Role / Device Role / Timing Role: Input-flexible buck-boost converter with programmable frequency to avoid EMI in high-speed serial interfaces. Use Value: Meets FireWire specification's 12 V–40 V input range while maintaining <10 mVpp output ripple in PWM mode at 1 MHz. |
Use Scenario: Providing ultra-low-quiescent 3 V supply to RTC and SRAM during main power failure in medical devices. IC Role / Device Role / Timing Role: Standby regulator with 3 µA shutdown and 50 µA Burst Mode current. Use Value: Enables >10-year coin-cell battery life; internal soft-start prevents RTC register corruption during wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IFE-2#TRPBF | Same silicon, rated for –40°C to +125°C junction; lower max temp grade and reduced reliability screening vs. MP-grade. | Suitable for non-military industrial controls but not qualified for extended-temperature automotive or aerospace use. | Select LTC3115MPFE-2#TRPBF when full –55°C to +150°C operation with MIL-PRF-38535 Class V compliance is required. |
| LTC3115HFE-2#TRPBF | Same silicon, rated for –40°C to +150°C; lacks the –55°C low-temp guarantee and MP-grade burn-in/test coverage. | Applicable in high-temp industrial settings (e.g., motor drives) but not certified for space or defense programs requiring Class V. | Choose LTC3115MPFE-2#TRPBF for mission-critical applications demanding validated low-temperature startup and extended lifetime reliability. |
Compared with LTC3115IFE-2#TRPBF and LTC3115HFE-2#TRPBF, the LTC3115MPFE-2#TRPBF provides guaranteed operation down to –55°C, full MIL-PRF-38535 Class V screening, and extended lifetime validation-making it the only option qualified for space-grade and defense-critical power management where cold-start reliability is non-negotiable.
Availability
LTC3115MPFE-2#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial 24 V rail regulation, FireWire power delivery, and backup power for real-time clocks requiring stable component supply across extreme temperature ranges.
Supply support for LTC3115MPFE-2#TRPBF 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3115MPFE-2#TRPBF belongs to the LTC® monolithic DC/DC converter product line, designed specifically for high-reliability power conversion in environments with wide input variations, fast transients, and extreme temperature demands.
FAQ
What is the maximum output current capability of the LTC3115MPFE-2#TRPBF?
The LTC3115MPFE-2#TRPBF delivers up to 2 A in step-down operation when VIN ≥ 6 V and VOUT = 5 V. In buck-boost mode with VIN near VOUT, output current is limited by thermal design and inductor saturation; typical continuous output is 1.2 A at 12 V out with 24 V in on a 2-layer PCB. The LTC3115MPFE-2#TRPBF includes internal current limiting (2.4–3.7 A typical) and reverse current protection (–1.5 A) to safeguard against overload conditions.
Does the LTC3115MPFE-2#TRPBF support external clock synchronization?
Yes, the LTC3115MPFE-2#TRPBF supports external clock synchronization via the PWM/SYNC pin, accepting input frequencies from 100 kHz to 2 MHz. When driven by an external clock, the device operates in fixed-frequency PWM mode with matched edge alignment and jitter <100 ps RMS. This capability allows the LTC3115MPFE-2#TRPBF to coexist with other switching regulators in noise-sensitive systems such as radar receivers or high-speed ADC power domains without beat-frequency interference.
How does the RUN pin function on the LTC3115MPFE-2#TRPBF?
The RUN pin on the LTC3115MPFE-2#TRPBF serves dual functions: enabling/disabling the IC and setting custom input undervoltage lockout (UVLO) thresholds. It activates when voltage exceeds 1.21 V (typical) and sources 0.5 µA to provide hysteresis. A resistor divider from PVIN to GND allows precise UVLO configuration-for example, a 24 V system can be set to disable below 21.5 V and re-enable at 22.5 V. The LTC3115MPFE-2#TRPBF datasheet specifies RUN pin voltage must never exceed VIN + 0.3 V under any condition.
What thermal considerations apply to the LTC3115MPFE-2#TRPBF in its TSSOP package?
The LTC3115MPFE-2#TRPBF in the 20-lead TSSOP (FE) package has θJA = 38°C/W on a standard 2-layer PCB with 1 in² copper pour and the exposed PGND pad fully soldered to the ground plane. To maintain operation at 150°C junction temperature, ambient must be limited to ≤112°C at 2 A load (assuming 2 W dissipation). Thermal derating curves in the LTC3115MPFE-2#TRPBF datasheet show die temperature rise vs. load current at multiple switching frequencies and input voltages to guide heatsinking decisions.
Can the LTC3115MPFE-2#TRPBF operate with input voltages below 2.7 V?
No, the LTC3115MPFE-2#TRPBF is not specified or guaranteed to operate below 2.7 V input. Absolute maximum ratings permit –0.3 V on VIN/PVIN, but functional operation begins at 2.7 V minimum per electrical characteristics table. Attempting operation below this threshold may result in erratic regulation, failure to start, or undefined behavior. For sub-2.7 V applications, consider the LTC3115-1 variant or alternative architectures such as boost-only regulators with lower VIN limits.
LTC3115MPFE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 800mA, 2A
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115MPFE-2#TRPBF FAQ
1.How can I place an order for LTC3115MPFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115MPFE-2#TRPBF 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 LTC3115MPFE-2#TRPBF reliable?
The price and inventory of LTC3115MPFE-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115MPFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115MPFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115MPFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115MPFE-2#TRPBF?
LTC3115MPFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115MPFE-2#TRPBF 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 LTC3115MPFE-2#TRPBF?
For technical support, including LTC3115MPFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115MPFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3115MPFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115MPFE-2#TRPBF 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 LTC3115MPFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115MPFE-2#TRPBF?
All LTC3115MPFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115MPFE-2#TRPBF, 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 LTC3115MPFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115MPFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3115MPFE-2#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
