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Analog Devices Inc. LTC3115EFE-1#TRPBF
- Part No.:
- LTC3115EFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115EFE-1#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,498
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Product details
Overview
LTC3115EFE-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, 95% peak efficiency, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LTC3115EFE-1#TRPBF datasheet, LTC3115EFE-1#TRPBF pinout, LTC3115EFE-1#TRPBF application, or LTC3115EFE-1#TRPBF equivalent, key selection criteria include input/output voltage overlap capability, burst-mode quiescent current (30µA), shutdown current (3µA), thermal performance in TSSOP package, and compatibility with 24V/28V industrial rails.
Technical Context
The LTC3115EFE-1#TRPBF implements a four-switch synchronous buck-boost topology with proprietary mode-transition control, enabling seamless regulation when VIN < VOUT, VIN > VOUT, or VIN ≈ VOUT. It integrates internal gate drivers, a 4.45V VCC regulator, and reverse-current blocking to prevent backfeed from PVOUT.
Its voltage-mode PWM control loop uses an external RT resistor for oscillator tuning and supports external clock synchronization via the PWM/SYNC pin. The IC features programmable input UVLO with hysteresis, internal soft-start (9ms), and overtemperature protection with 125°C junction limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports wide-input sources including lead-acid batteries, FireWire, and unregulated industrial rails. |
| Output Voltage Range | 2.7V to 40V - enables single-rail conversion across automotive (12V/24V), telecom (48V), and industrial (24V/28V) systems. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full rated load without derating when input exceeds output. |
| Switching Frequency | 100kHz to 2MHz - selectable via RT pin; higher frequencies enable smaller inductors (e.g., 5.2µH at 2MHz). |
| Peak Efficiency | 95% - achieved at mid-load in PWM mode with optimized layout and low-RDS(on) internal switches (150mΩ each). |
| Quiescent Current | 30µA in Burst Mode - extends battery life in always-on automotive sensors and telematics modules. |
| Shutdown Current | 3µA - ensures minimal drain during vehicle sleep modes or system standby states. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), thermally enhanced, exposed pad (Pin 21) connected to PGND for optimal thermal dissipation (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power Ground Return Path | Mandatory low-impedance connection to PCB ground plane; exposed pad must be soldered for rated thermal performance. |
| RUN (Pin 2) | Enable/UVLO Control Input | Drives IC enable/disable; sets custom input undervoltage lockout threshold (1.21V nominal) with 100mV hysteresis. |
| SW2 (Pin 3) | Buck-Boost Power Switch Node | Connects to one end of inductor; carries bidirectional current in boost/buck operation; requires Schottky clamp for VOUT > 20V short-circuit protection. |
| PVOUT (Pin 4) | Power Output Supply Rail | Delivers regulated output; requires ≥10µF low-ESR capacitor placed adjacent to IC with short ground return path. |
| GND (Pins 5, 6) | Signal Ground Reference | Reference for control circuitry; must be tied to system ground but kept separate from noisy PGND traces until star point. |
| VC (Pin 7) | Error Amplifier Output | Connects to FB via compensation network (e.g., RC) to stabilize feedback loop; sensitive to noise coupling. |
| FB (Pin 8) | Voltage Feedback Input | Sets output voltage via resistor divider; nominal 1000mV reference; routing must avoid SW node crosstalk. |
| RT (Pin 9) | Oscillator Frequency Programming | Resistor to ground sets switching frequency (e.g., 35.7kΩ → 1MHz); tolerance directly impacts fSW accuracy. |
| VCC (Pin 12) | Internal Logic Supply Input | Must be shorted to PVCC; powers control circuitry; bypassed with ≥4.7µF capacitor to PGND. |
| VIN (Pin 13) | VCC Regulator Input | Supplies internal LDO; senses input for UVLO; bypassed with 0.1µF capacitor near IC. |
| PVCC (Pin 14) | VCC Regulator Output | Provides 4.45V rail for gate drivers and logic; must be connected to VCC; additional local bypass recommended if trace long. |
| BST2 (Pin 15) | SW2 Gate Drive Bootstrap | Connected to SW2 via 0.1µF capacitor; generates high-side gate drive voltage for switch D. |
| BST1 (Pin 16) | SW1 Gate Drive Bootstrap | Connected to SW1 via 0.1µF capacitor; generates high-side gate drive voltage for switch A. |
| PVIN (Pin 17) | Main Power Input | Primary input rail for power stage; requires ≥4.7µF ceramic + optional 47–100µF bulk capacitor for high-ESR sources. |
| SW1 (Pin 18) | Buck-Boost Power Switch Node | Connects to other end of inductor; forms 4-switch topology with SW2; shares same current path constraints. |
| PWM/SYNC (Pin 19) | Mode Control & Clock Sync | High = PWM mode; low = Burst Mode; external clock input synchronizes switching up to 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Enables true buck-boost operation without polarity reversal or external diodes; eliminates subharmonic instability. |
| Seamless mode transition algorithm | Prevents output transients and inductor current discontinuity when crossing VIN = VOUT boundary. |
| Integrated VCC LDO with 4.45V output | Eliminates need for external bias supply; powers gate drivers and logic from VIN; supports 2.7V start-up. |
| Reverse current blocking | Prevents backfeed from PVOUT to PVIN during fault or shutdown; critical for multi-source power systems. |
| Thermally enhanced TSSOP package | Exposes PGND pad for direct PCB thermal conduction; achieves θJA = 38°C/W with 2-in² 2oz copper. |
Applications
| Automotive Infotainment Power | Industrial 24V/28V Rail Regulation |
|---|---|
Use Scenario: Powering display controllers and audio processors from variable 9V–16V automotive battery with cold-crank immunity down to 3.6V. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 5V/3.3V rails during engine start-stop cycles and load-dump events. Use Value: Seamless VIN-to-VOUT transition prevents system reset during cranking; 3µA shutdown current preserves battery during parking mode. | Use Scenario: Converting unregulated 24V/28V factory floor supply into clean 12V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Isolated, high-efficiency DC/DC stage delivering 2A continuous load with minimal heat rise in confined enclosures. Use Value: 95% efficiency reduces thermal load; 40V absolute max rating withstands 48V surge transients per IEC 61000-4-5. |
| FireWire-Compatible Power Adapter | Multi-Source Backup Power System |
Use Scenario: Providing regulated 5V/1A output from FireWire bus (up to 40V open-circuit) for portable test equipment. IC Role / Device Role / Timing Role: Direct FireWire-powered regulator eliminating need for intermediate 12V conversion stage. Use Value: Wide 2.7V–40V input range accepts FireWire's variable voltage; 2MHz option enables ultra-compact 12mm × 12mm solution. | Use Scenario: Managing power from solar panel, USB-C PD, and Li-ion battery in edge gateway device with automatic source prioritization. IC Role / Device Role / Timing Role: Common output-stage regulator accepting any input source while preventing backfeed between sources. Use Value: Reverse-current blocking and input UVLO programmability enable robust source arbitration without external MOSFET controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EDHD-1#TRPBF | Same die, 16-lead 4mm × 5mm DFN package; lower θJA (43°C/W) but no exposed pad pins 1–16 only. | Better thermal performance in space-constrained layouts; requires tighter PCB layout for thermal vias under exposed pad. | Select for compact designs where board area is critical and thermal margin allows DFN mounting. |
| MAX20406AATG+T | 36V max input, 3.5A output, fixed 2.1MHz fSW; no programmable UVLO or external sync; different pinout and compensation scheme. | Higher current but narrower voltage range; lacks burst-mode optimization for ultra-low-IQ battery apps. | Select when 3.5A output is required and input stays below 36V; not drop-in compatible due to pinout and control differences. |
Compared with LTC3115EDHD-1#TRPBF, the LTC3115EFE-1#TRPBF offers superior thermal management via dedicated PGND pins and larger exposed pad area, while MAX20406AATG+T trades configurability for higher current and fixed-frequency simplicity-neither is pin-compatible, requiring layout revision.
Availability
LTC3115EFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V/28V power conversion, and FireWire-compatible adapter designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3115EFE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3115 product line delivers high-voltage, high-efficiency buck-boost converters designed for harsh environments including automotive, industrial, and telecom infrastructure where wide input ranges and reliability are critical.
FAQ
What is the maximum input voltage rating for the LTC3115EFE-1#TRPBF?
The LTC3115EFE-1#TRPBF has an absolute maximum input voltage rating of 45V on PVIN and VIN pins. Its operational input range is specified from 2.7V to 40V, making it suitable for 24V/28V industrial rails and automotive systems with load-dump protection. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115EFE-1#TRPBF support external clock synchronization?
Yes, the LTC3115EFE-1#TRPBF supports external clock synchronization via the PWM/SYNC pin, which accepts input frequencies from 100kHz to 2MHz. When driven by an external clock, the IC operates in fixed-frequency PWM mode with synchronized switching edges, reducing EMI in noise-sensitive applications like automotive radar or medical imaging subsystems.
How does the RUN pin function on the LTC3115EFE-1#TRPBF?
The RUN pin on the LTC3115EFE-1#TRPBF serves dual functions: enabling/disabling the IC and setting custom input undervoltage lockout (UVLO). It triggers enablement at 1.21V nominal with 100mV hysteresis. A resistor divider from PVIN to GND allows precise UVLO threshold programming, and the pin must never exceed VIN + 0.3V under any condition.
What is the purpose of the BST1 and BST2 pins on the LTC3115EFE-1#TRPBF?
The BST1 and BST2 pins on the LTC3115EFE-1#TRPBF provide bootstrap gate drive voltage for the high-side N-channel switches (A and D). Each connects to its respective switch node (SW1 or SW2) through a 0.1µF capacitor, enabling efficient high-side FET turn-on without requiring external high-voltage gate drivers or charge pumps.
Is the LTC3115EFE-1#TRPBF qualified for automotive applications?
Yes, the LTC3115EFE-1#TRPBF is AEC-Q100 qualified for automotive applications, rated for –40°C to +125°C operating junction temperature. It meets automotive reliability requirements including HTOL, TC, and ESD testing, and is suitable for infotainment, ADAS camera power, and body control modules where wide-input regulation and low quiescent current are essential.
LTC3115EFE-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
LTC3115EFE-1#TRPBF FAQ
1.How can I place an order for LTC3115EFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EFE-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 LTC3115EFE-1#TRPBF reliable?
The price and inventory of LTC3115EFE-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 LTC3115EFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115EFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EFE-1#TRPBF?
LTC3115EFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EFE-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 LTC3115EFE-1#TRPBF?
For technical support, including LTC3115EFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3115EFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EFE-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 LTC3115EFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115EFE-1#TRPBF?
All LTC3115EFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EFE-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 LTC3115EFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115EFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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