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Analog Devices Inc. LTC3115EFE-2#TRPBF
- Part No.:
- LTC3115EFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115EFE-2#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
LTC3115EFE-2#TRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms). It supports 2.7V–40V input and output ranges, delivers up to 2A in step-down mode (VIN ≥ 6V), operates at programmable frequencies up to 2MHz, and features 3µA shutdown current-ideal for automotive power systems with wide-voltage battery inputs.
For engineers reviewing the LTC3115EFE-2#TRPBF datasheet, LTC3115EFE-2#TRPBF pinout, LTC3115EFE-2#TRPBF application, or LTC3115EFE-2#TRPBF equivalent, key selection criteria include its seamless buck-boost mode transitions, 30µA no-load quiescent current in Burst Mode®, AEC-Q100 qualification, and compatibility with 20-lead TSSOP thermal performance requirements.
Technical Context
The LTC3115EFE-2#TRPBF implements a proprietary voltage-mode control algorithm enabling continuous regulation across buck, boost, and buck-boost regions without subharmonic oscillation or output transients. Its four internal N-channel DMOS switches (150mΩ each) support bidirectional power flow, while integrated high-side gate drivers use external BST1/BST2 flying capacitors for efficient switching.
It features dual-mode operation: fixed-frequency PWM (100kHz–2MHz, synchronizable) for low-noise, high-current delivery; and Burst Mode® for ultralow 30µA no-load quiescent current. Input UVLO is programmable via RUN pin divider, and internal soft-start (9ms) prevents inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid, 24V industrial rails, and unregulated adapters without external pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-supply generation of 3.3V, 5V, 12V, or 24V outputs from variable inputs. |
| Max Output Current | 2A in step-down (VIN ≥ 6V) - sufficient for powering microcontrollers, sensors, and interface ICs directly. |
| Switching Frequency | 100kHz to 2MHz - selectable via RT resistor; higher frequencies allow smaller inductors (e.g., 5.2µH at 2MHz). |
| Quiescent Current | 30µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on automotive telematics modules. |
| Efficiency | Up to 95% - achieved at mid-load with 24V→5V conversion, minimizing thermal stress in enclosed enclosures. |
| Package | 20-lead TSSOP (FE) - thermally enhanced with exposed PGND pad; θJA = 38°C/W enables 1.5W dissipation at 125°C junction. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), 0.65mm pitch, exposed PGND pad (Pin 21) requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1, 10, 11, 20, Exposed Pad 21) | Power Ground Return | Low-impedance path for switch currents; exposed pad must be soldered to PCB ground plane for rated θJC = 10°C/W. |
| RUN (Pin 2) | Enable & UVLO Threshold Input | Drives internal comparator; 1.21V threshold enables IC; resistor divider sets custom input undervoltage lockout. |
| SW2 (Pin 3) | Buck-Boost Switch Node | Connects to one end of inductor; drives power switch D (PVOUT→SW2) and C (SW2→PGND) in boost/buck modes. |
| PVOUT (Pin 4) | Output Power Rail | High-current output node; requires ≥10µF low-ESR capacitor placed adjacent to IC with short ground return. |
| GND (Pins 5, 6) | Signal Ground Reference | Reference for FB, VC, RT, and internal analog circuitry; must be isolated from noisy PGND traces until star-point connection. |
| VC (Pin 7) | Error Amplifier Output | Compensation node; connects to FB via RC network to stabilize loop response across all operating modes. |
| FB (Pin 8) | Voltage Feedback Input | Senses output via resistor divider; nominal 1000mV reference enables precise VOUT programming (e.g., 5V = R1/R2 = 4:1). |
| RT (Pin 9) | Oscillator Frequency Set | Resistor-to-ground sets fSW (e.g., 35.7kΩ → 1MHz); enables layout-driven frequency optimization. |
| VCC (Pin 12) | Internal Logic Supply | Powered by PVCC; must be short-traced to PVCC; supplies control circuitry and requires ≥4.7µF bypass to PGND. |
| VIN (Pin 13) | VCC Regulator Input | Input to internal LDO generating VCC; senses VIN for UVLO; requires 0.1µF local bypass to GND. |
| PVCC (Pin 14) | VCC Regulator Output | Supplies gate drivers and logic; must be tied directly to VCC; additional bypass recommended if trace >2mm. |
| BST2 (Pin 15) | SW2 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW2; generates floating rail for high-side switch D gate drive. |
| BST1 (Pin 16) | SW1 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW1; generates floating rail for high-side switch A gate drive. |
| PVIN (Pin 17) | Main Power Input | Primary input for power switches; requires ≥4.7µF ceramic + optional 47µF bulk capacitor for stability under transient loads. |
| SW1 (Pin 18) | Buck-Boost Switch Node | Connects to other end of inductor; drives power switch A (PVIN→SW1) and B (SW1→PGND) in buck/boost modes. |
| 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 |
|---|---|
| Seamless Buck-Boost Transitions | Proprietary algorithm eliminates output glitches when VIN crosses VOUT-critical for stable MCU supply during cold-crank (6V→16V) events. |
| Programmable Input UVLO | Custom threshold set via RUN pin divider-enables precise brown-out protection aligned with system-level battery monitoring. |
| Internal Soft-Start | 9ms controlled ramp prevents inrush into large output capacitors-avoids tripping upstream fuse or causing bus droop. |
| Output Disconnect in Shutdown | Internal switches isolate PVOUT from PVIN-prevents backfeed into failed input sources in redundant power architectures. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C junction temperature-validated for under-hood automotive applications per stress test requirements. |
Applications
| Automotive Start-Stop Systems | Industrial 24V Fieldbus Power |
|---|---|
Use Scenario: Powers infotainment head units during engine cranking where battery voltage dips from 12.6V to 6V for 500ms. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining regulated 5V/2A output despite rapid VIN transients. Use Value: Prevents system reset by sustaining VOUT during cold-crank; 2A capability supports USB charging ports and display backlight drivers. | Use Scenario: Converts unregulated 24V industrial rail (18V–32V) to stable 3.3V for PROFIBUS DP slave controllers. IC Role / Device Role / Timing Role: Wide-input buck-boost converter delivering constant output despite line fluctuations and load surges. Use Value: Eliminates need for separate pre-regulator; 95% efficiency reduces heat in sealed DIN-rail enclosures. |
| FireWire Power Delivery | Multi-Source Telecom Backup |
Use Scenario: Regulates FireWire cable power (28V–40V) to 12V for legacy audio interface peripherals. IC Role / Device Role / Timing Role: High-voltage buck-boost regulator accepting variable input from IEEE 1394 PHY layer. Use Value: Supports full 1.5A FireWire load without external FETs; 40V absolute max rating protects against cable ESD spikes. | Use Scenario: Provides seamless switchover between AC adapter (19V), PoE+ (57V), and Li-ion battery (8.4V–12.6V) in network edge routers. IC Role / Device Role / Timing Role: Single-chip solution handling all three input domains with automatic mode transition. Use Value: Reduces BOM count by replacing three discrete regulators; 2.7V–40V range covers entire source envelope. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115EDHD-2#TRPBF | Same silicon, 16-lead 4mm×5mm DFN package; θJA = 43°C/W vs 38°C/W for TSSOP. | Preferred for space-constrained layouts; lower thermal mass suits pulsed-load applications. | Select when PCB area is critical and thermal budget allows higher junction rise. |
| MAX20406AATG/V+T | 36V max input, 3.5A output, 2.2MHz max fSW; no programmable UVLO; different pinout and compensation scheme. | Targeted at consumer portable devices; lacks AEC-Q100 qualification and 40V robustness. | Consider only for non-automotive, cost-sensitive designs where 36V input suffices and qualification is not required. |
Compared with LTC3115EDHD-2#TRPBF, the LTC3115EFE-2#TRPBF offers superior thermal performance in high-ambient environments, while MAX20406AATG/V+T trades automotive reliability for higher peak current and integration density-neither is pin-compatible, requiring full layout revision.
Availability
LTC3115EFE-2#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial 24V fieldbus nodes, FireWire-powered audio interfaces, and multi-source telecom backup supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3115EFE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3115-2 product line delivers high-voltage, high-efficiency buck-boost regulation for systems exposed to wide-input transients-designed specifically for automotive, industrial, and telecom power architectures demanding reliability across –40°C to 125°C.
FAQ
What is the maximum input voltage rating for the LTC3115EFE-2#TRPBF?
The LTC3115EFE-2#TRPBF has an absolute maximum input voltage rating of 45V on PVIN, PVOUT, and VIN pins. Its operational input range is specified from 2.7V to 40V, making it suitable for 24V and 36V industrial rails and automotive battery systems including cold-crank and load-dump conditions. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115EFE-2#TRPBF support synchronization to an external clock?
Yes, the LTC3115EFE-2#TRPBF supports external clock synchronization via the PWM/SYNC pin. When driven with a clean TTL/CMOS clock signal between 100kHz and 2MHz, the device locks its switching to the external frequency in fixed-frequency PWM mode. The applied clock pulse width must exceed 100ns, and the pin voltage must remain within –0.3V to 6V to avoid damage.
How does the RUN pin function in the LTC3115EFE-2#TRPBF?
The RUN pin on the LTC3115EFE-2#TRPBF serves dual functions: enabling/disabling the IC and setting custom input undervoltage lockout (UVLO). It triggers enable at ~1.21V and sources 0.5µA to provide hysteresis. Connecting a resistor divider from VIN to GND allows precise UVLO threshold programming-e.g., 2.7V UVLO for 12V lead-acid systems-without external comparators.
What thermal considerations apply to the LTC3115EFE-2#TRPBF in TSSOP package?
The LTC3115EFE-2#TRPBF in 20-lead TSSOP has θJA = 38°C/W and θJC = 10°C/W. For reliable operation at 125°C junction temperature, the exposed PGND pad (Pin 21) must be soldered to a minimum 200mm² copper pour connected to the PCB ground plane. Thermal vias (≥6×0.3mm) under the pad are strongly recommended to achieve rated thermal performance in continuous 1.5W dissipation scenarios.
Can the LTC3115EFE-2#TRPBF operate with output voltages below its input voltage?
Yes, the LTC3115EFE-2#TRPBF operates seamlessly in buck, boost, and buck-boost modes. When VOUT < VIN (e.g., 24V input → 5V output), it functions as a synchronous buck converter delivering up to 2A. The proprietary control algorithm ensures continuous regulation and zero-crossing transitions without output disturbance-verified in load-transient waveforms with <200mV deviation during 0A→1A steps at 24V→5V.
LTC3115EFE-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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115EFE-2#TRPBF FAQ
1.How can I place an order for LTC3115EFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EFE-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 LTC3115EFE-2#TRPBF reliable?
The price and inventory of LTC3115EFE-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 LTC3115EFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115EFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EFE-2#TRPBF?
LTC3115EFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EFE-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 LTC3115EFE-2#TRPBF?
For technical support, including LTC3115EFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3115EFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EFE-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 LTC3115EFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115EFE-2#TRPBF?
All LTC3115EFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EFE-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 LTC3115EFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115EFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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