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Analog Devices Inc. LTC3115IFE-1#TRPBF
- Part No.:
- LTC3115IFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115IFE-1#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
LTC3115IFE-1#TRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter with 2.7V–40V input and output voltage ranges, programmable 100kHz–2MHz switching frequency, and Burst Mode® operation enabling 50µA no-load quiescent current - designed for automotive power systems, industrial 24V/28V rails, and FireWire regulators where input voltage may fall below, exceed, or equal the regulated output.
For engineers reviewing the LTC3115IFE-1#TRPBF datasheet, LTC3115IFE-1#TRPBF pinout, LTC3115IFE-1#TRPBF application, or LTC3115IFE-1#TRPBF equivalent, key selection criteria include verified 2A step-down capability at VIN ≥ 6V, AEC-Q100 qualification (I-grade), thermal performance in 20-lead TSSOP (θJA = 38°C/W), and confirmed compatibility with external clock synchronization up to 2MHz.
Technical Context
The LTC3115IFE-1#TRPBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each), proprietary mode-transition control eliminating subharmonics, and dual gate drivers supporting bootstrapped high-side drive via BST1/BST2 pins. It operates across three regions - buck, boost, and buck-boost - with seamless transitions ensured by real-time duty-cycle modulation.
Its voltage-mode control loop uses an error amplifier (VC pin) with external compensation, a 1000mV ±23mV feedback reference, and programmable oscillator frequency set by RT pin resistor (e.g., 35.7kΩ yields 1MHz). The RUN pin provides enable/disable control and configurable UVLO with 100mV hysteresis and 1.21V nominal threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports wide-input sources including lead-acid batteries, unregulated wall adapters, and FireWire ports without pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-converter solutions for variable-output systems such as telecom bias rails or multi-rail industrial controllers. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full rated load when input exceeds output, critical for 24V-to-5V/12V conversion in vehicle ECUs. |
| Switching Frequency | 100kHz to 2MHz - adjustable via RT pin; higher frequencies allow smaller inductors (e.g., 5.2µH at 2MHz), reducing board area in space-constrained designs. |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on automotive sensors or portable test equipment. |
| Efficiency | Up to 95% at 5V/1A (VIN = 12V) - minimizes thermal stress in sealed enclosures and reduces heatsink requirements in industrial power modules. |
| Package | 20-lead plastic TSSOP (FE) - thermally enhanced with exposed PGND pad; θJA = 38°C/W enables 1.5W dissipation at ΔT = 57°C ambient rise. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), 4mm × 6.5mm × 1.1mm, exposed PGND pad (Pin 21) requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 / PGND | Power Ground | Primary return path for high-current switch nodes SW1/SW2; must be low-impedance connection to PCB ground plane. |
| PIN 2 / RUN | Enable & UVLO Control | Logic-enable input with 1.21V threshold; resistor divider from VIN sets custom undervoltage lockout with 100mV hysteresis. |
| PIN 3 / SW2 | Buck-Boost Power Switch | Connects to one end of inductor; drives output-side switch in buck, boost, and buck-boost modes; requires 0.1µF BST2 capacitor. |
| PIN 4 / PVOUT | Power Output Supply | High-current output node; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with short ground return. |
| PIN 5 / GND | Signal Ground | Reference for FB, VC, RT, and PWM/SYNC; must be isolated from PGND until star-point connection near IC. |
| PIN 6 / GND | Signal Ground | Duplicate signal ground pin; improves noise immunity for analog control circuitry. |
| PIN 7 / VC | Error Amplifier Output | Compensation node for voltage loop; connects to FB via RC network to stabilize regulation across all operating modes. |
| PIN 8 / FB | Feedback Input | Senses output voltage via resistor divider; 1000mV ±23mV reference enables precise VOUT setting (e.g., 5V via 150kΩ/30.1kΩ). |
| PIN 9 / RT | Oscillator Programming | Sets switching frequency via resistor to ground (e.g., 35.7kΩ → 1MHz); tolerance directly impacts frequency accuracy. |
| PIN 10 / PGND | Power Ground | Secondary PGND connection; ties to same copper pour as Pin 1 and exposed pad for uniform current distribution. |
| PIN 11 / PGND | Power Ground | Third PGND terminal; ensures robust grounding for high di/dt paths during switching transitions. |
| PIN 12 / PWM/SYNC | Mode Control & Sync Input | High = fixed-frequency PWM; Low = Burst Mode; external clock ≤2MHz synchronizes switching with system timing source. |
| PIN 13 / SW1 | Buck-Boost Power Switch | Connects to other end of inductor; drives input-side switch; requires 0.1µF BST1 capacitor for gate drive bootstrap. |
| PIN 14 / PVIN | Power Input Supply | Main high-voltage input node; requires ≥4.7µF ceramic + optional 47µF bulk capacitor for transient suppression. |
| PIN 15 / BST1 | Bootstrap Capacitor Node | Connects to SW1 via 0.1µF capacitor; generates gate drive voltage for high-side N-channel switch A. |
| PIN 16 / BST2 | Bootstrap Capacitor Node | Connects to SW2 via 0.1µF capacitor; generates gate drive voltage for high-side N-channel switch D. |
| PIN 17 / PVCC | VCC Regulator Output | Internal LDO output (4.45V typ); powers gate drivers and logic; must be shorted to VCC pin externally. |
| PIN 18 / VIN | VCC Regulator Input | Input to internal 5V LDO; supplies control circuitry; bypassed with 0.1µF capacitor close to pin. |
| PIN 19 / VCC | VCC Regulator Input | Low-voltage supply input for IC core; tied directly to PVCC in layout to ensure stable gate drive and logic operation. |
| PIN 20 / PGND | Power Ground | Fourth PGND terminal; completes low-inductance return path for all power switches and driver circuits. |
| PIN 21 / PGND (Exposed Pad) | Thermal & Power Ground | Primary thermal path; must be soldered to ≥2cm² copper area connected to system ground for rated θJA = 38°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Enables true buck-boost operation without polarity reversal; eliminates need for external MOSFETs or complex controller+driver combinations. |
| Seamless mode transition algorithm | Prevents output voltage glitches and subharmonic oscillation during VIN crossing VOUT - critical for stable powering of FPGAs and ADCs. |
| Programmable 100kHz–2MHz switching | Allows optimization between efficiency (lower fSW) and size (higher fSW); supports EMI filtering with fixed-frequency PWM mode. |
| AEC-Q100 qualified (Grade I) | Validated for –40°C to +125°C junction operation; meets automotive reliability standards for engine control, ADAS, and infotainment subsystems. |
| Internal soft-start (9ms typical) | Controls inrush current during power-up; prevents input rail collapse and avoids false triggering of upstream overcurrent protection. |
| Output disconnect in shutdown | Blocks reverse current flow from VOUT to VIN during disable; protects upstream sources and prevents battery drain in backup systems. |
Applications
| Automotive Power Systems | Industrial 24V/28V Power Rails |
|---|---|
|
Use Scenario: Powering infotainment head units from vehicle battery (9V–16V) while maintaining stable 5V/3.3V rails despite cold-crank dips to 3.6V. IC Role / Device Role / Timing Role: Buck-boost regulator providing uninterrupted output during start-stop cycles and load-dump transients. Use Value: Eliminates need for separate buck + boost stages; 2A capability supports USB-C PD charging ports integrated into dash displays. |
Use Scenario: Converting unregulated 24V factory floor supply (18V–32V) to clean 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated output across wide input range with minimal external components. Use Value: 95% peak efficiency reduces heat generation in enclosed DIN-rail enclosures; AEC-Q100 qualification ensures long-term reliability in harsh environments. |
| FireWire Regulator | Multiple Power Source Supplies |
|
Use Scenario: Generating stable 12V/2A from IEEE 1394 FireWire port (28V–40V) for legacy instrumentation peripherals. IC Role / Device Role / Timing Role: High-voltage buck-boost converter accepting wide-input FireWire supply while regulating tightly to 12V ±1%. Use Value: Direct compatibility with FireWire's high-voltage specification avoids inefficient two-stage conversion; 40V absolute max rating ensures robustness against surges. |
Use Scenario: Single-chip solution for devices powered by either USB (5V), Li-ion battery (3.0V–4.2V), or 12V wall adapter - all delivering 3.3V to MCU. IC Role / Device Role / Timing Role: Universal input regulator adapting to multiple source types without hardware reconfiguration. Use Value: 2.7V–40V input range covers all common sources; Burst Mode® extends runtime on battery while PWM mode ensures low-noise supply for RF sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390EFE#PBF | Higher 60V input rating, 3.5A output, but larger 28-lead TSSOP package and no AEC-Q100 qualification. | Preferred for 48V industrial systems or PoE++ applications needing >2A; not suitable for automotive temperature or footprint constraints. | Select LT8390EFE#PBF only if input exceeds 40V or output current >2A is required; verify thermal design for larger package. |
| TPS63020DSJR | Lower 12V max input, 2.5A output, 3mm × 2mm QFN package, but lacks programmable frequency and external sync capability. | Targeted at portable electronics with tight space budgets and single-cell Li-ion inputs; unsuitable for automotive or industrial high-voltage use. | Choose TPS63020DSJR for compact battery-powered devices under 12V input; avoid where VIN > 12V or EMI-controlled sync is needed. |
Compared with LT8390EFE#PBF and TPS63020DSJR, the LTC3115IFE-1#TRPBF uniquely balances 40V operation, AEC-Q100 compliance, 2MHz sync capability, and 20-lead TSSOP thermal performance - making it optimal for cost-sensitive, high-reliability 24V/28V automotive and industrial converters.
Availability
LTC3115IFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24V/28V power rails, and FireWire regulators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3115IFE-1#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 LTC3115-1 product line delivers high-voltage, high-efficiency buck-boost regulation for applications where input voltage varies widely relative to output - especially automotive, industrial, and legacy interface power systems demanding reliability and minimal external components.
FAQ
What is the maximum output current capability of the LTC3115IFE-1#TRPBF in buck mode?
The LTC3115IFE-1#TRPBF delivers up to 2A output current in step-down (buck) operation when input voltage is ≥6V and output is set to 5V. This is confirmed in the Electrical Characteristics table under "2A Output Current in Step-Down Operation for VIN ≥ 6V". Performance depends on thermal design - the 20-lead TSSOP package supports this current with proper PCB copper area and airflow.
Does the LTC3115IFE-1#TRPBF support external clock synchronization, and what is the valid frequency range?
Yes, the LTC3115IFE-1#TRPBF supports external clock synchronization via the PWM/SYNC pin. The valid input clock frequency range is 100kHz to 2MHz, matching its internal oscillator range. The datasheet specifies that the applied clock pulse width (positive or negative) must be ≥100ns, and the maximum pin voltage is 5.5V - ensuring compatibility with standard logic-level clocks.
Is the LTC3115IFE-1#TRPBF qualified for automotive applications, and what grade does it carry?
Yes, the LTC3115IFE-1#TRPBF is AEC-Q100 qualified for automotive applications. Per the Order Information table, the "IFE" suffix denotes Industrial grade with –40°C to +125°C operating junction temperature - the same grade used in automotive systems meeting AEC-Q100 Class 0/1 requirements. It is explicitly listed under "AUTOMOTIVE PRODUCTS" with #WPBF/#WTRPBF variants.
What is the feedback reference voltage of the LTC3115IFE-1#TRPBF, and how precise is it?
The LTC3115IFE-1#TRPBF has a nominal feedback reference voltage of 1000mV, with a guaranteed range of 977mV to 1017mV over temperature (–40°C to +125°C). This ±23mV tolerance (±2.3%) is specified in the Electrical Characteristics table under "Feedback Voltage", enabling accurate output voltage setting using standard resistor dividers.
How does the LTC3115IFE-1#TRPBF manage thermal performance in the 20-lead TSSOP package?
The LTC3115IFE-1#TRPBF achieves θJA = 38°C/W in the 20-lead TSSOP (FE) package by integrating an exposed PGND pad (Pin 21) that must be soldered to a minimum 2cm² PCB copper area connected to ground. Thermal resistance drops further with multilayer boards and internal ground planes - enabling 1.5W continuous dissipation before reaching 125°C junction limit at 25°C ambient.
LTC3115IFE-1#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:
- 1A, 2A
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115IFE-1#TRPBF FAQ
1.How can I place an order for LTC3115IFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IFE-1#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 LTC3115IFE-1#TRPBF reliable?
The price and inventory of LTC3115IFE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115IFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115IFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IFE-1#TRPBF?
LTC3115IFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IFE-1#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 LTC3115IFE-1#TRPBF?
For technical support, including LTC3115IFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3115IFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IFE-1#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 LTC3115IFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115IFE-1#TRPBF?
All LTC3115IFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IFE-1#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 LTC3115IFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115IFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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