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Analog Devices Inc. LTC3115HFE-2#TRPBF
- Part No.:
- LTC3115HFE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115HFE-2#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
LTC3115HFE-2#TRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms) and wide-input industrial/automotive power supplies. 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 - enabling robust operation in 24V/28V rail systems and battery-backed automotive ECUs.
For engineers reviewing the LTC3115HFE-2#TRPBF datasheet, LTC3115HFE-2#TRPBF pinout, LTC3115HFE-2#TRPBF application, or LTC3115HFE-2#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification (H-grade, –40°C to +150°C), 20-lead TSSOP thermally enhanced package, seamless buck/boost/buck-boost mode transitions, and programmable UVLO with 100mV hysteresis.
Technical Context
The LTC3115HFE-2#TRPBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each), proprietary voltage-mode control, and a low-noise switching algorithm that eliminates subharmonics and ensures transient-free mode transitions. Its dual gate-drive architecture uses BST1/BST2 flying capacitors to support high-side switch operation across full VIN–VOUT overlap.
It integrates a 4.45V VCC LDO regulator (with 50–110mA current limit), programmable oscillator (100kHz–2MHz via RT resistor), and dual-mode operation: fixed-frequency PWM (synchronizable) or Burst Mode® (30µA no-load quiescent current). The RUN pin provides enable control and configurable input UVLO with 1.21V threshold and 100mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports direct connection to lead-acid, LiFePO₄, 24V industrial rails, and unregulated adapters without pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-converter solutions for variable-output systems like FireWire regulators or multi-rail telecom supplies. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor signal chains from higher-voltage sources. |
| Switching Frequency | 100kHz to 2MHz (RT-programmable) - allows trade-off between inductor size (e.g., 5.2µH @ 2MHz) and EMI performance in space-constrained designs. |
| Shutdown Current | 3µA typical - preserves battery life in always-on automotive modules (e.g., CAN gateway wake-up circuits). |
| Junction Temp Range | –40°C to +150°C (H-grade) - qualified per AEC-Q100 Grade 1, enabling under-hood deployment without derating in engine control units. |
| Efficiency Peak | Up to 95% - achieved at mid-load (e.g., 5V/1A from 12V input), reducing thermal load on PCB and eliminating need for heatsinks in sealed enclosures. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), 4.4mm × 6.5mm × 1.1mm, exposed pad (Pin 21) connected to PGND for optimal thermal dissipation (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 / PGND | Power Ground | Primary return path for high-current SW1/SW2 switching; must be soldered to large copper pour for thermal and EMI control. |
| PIN 2 / RUN | Enable & UVLO Input | Drives internal comparator; 1.21V threshold enables precise input brown-out protection (e.g., 24V system lockout at 22.8V with resistor divider). |
| PIN 3 / SW2 | Buck-Boost Switch Node | Connects to inductor's "output" side; carries full load current in boost mode and reverse current during short-circuit recovery. |
| PIN 4 / PVOUT | Power Output Rail | High-current output terminal; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with shortest possible ground return. |
| PIN 5–6 / GND | Signal Ground | Reference for FB, VC, RT, and internal analog circuitry; must be isolated from PGND at single-point star ground to avoid noise coupling. |
| PIN 7 / VC | Error Amplifier Output | Connects to FB via Type-II/III compensation network; sets loop stability and transient response (e.g., 9ms soft-start duration). |
| PIN 8 / FB | Feedback Input | Senses output via resistor divider; 1000mV nominal reference enables accurate VOUT programming (e.g., 5V ±1% with 1% resistors). |
| PIN 9 / RT | Oscillator Programming | Resistor-to-ground sets frequency (e.g., 35.7kΩ → 1MHz); enables EMI spread-spectrum tuning and layout-driven frequency optimization. |
| PIN 12 / VCC | Internal Logic Supply | Must be short-traced to PVCC; powers control logic and gate drivers - bypassed with ≥4.7µF capacitor to suppress supply ripple. |
| PIN 13 / VIN | VCC Regulator Input | Feeds internal LDO; senses input for UVLO and supplies bias current - bypassed with 0.1µF capacitor near IC for high-frequency noise rejection. |
| PIN 14 / PVCC | VCC Regulator Output | Supplies gate drivers and internal circuitry; shares net with VCC - external capacitor required if trace length exceeds 3mm. |
| PIN 15 / BST2 | SW2 Gate Drive Bootstrap | Connects to SW2 via 0.1µF capacitor; generates floating rail for high-side switch D, enabling 100% duty cycle in boost mode. |
| PIN 16 / BST1 | SW1 Gate Drive Bootstrap | Connects to SW1 via 0.1µF capacitor; generates floating rail for high-side switch A, supporting seamless buck-to-boost transition. |
| PIN 17 / PVIN | Main Power Input | High-current input node; requires ≥4.7µF ceramic + optional 47µF bulk capacitor to damp input LC resonance in long-cable applications. |
| PIN 18 / SW1 | Buck-Boost Switch Node | Connects to inductor's "input" side; carries full load current in buck mode and reverse current during light-load discontinuous conduction. |
| PIN 19 / PWM/SYNC | Mode Control & Sync Input | High = PWM mode; Low = Burst Mode; external clock = synchronization - enables deterministic timing in multi-converter systems. |
| PIN 20 / PGND | Power Ground | Secondary PGND connection; ties to exposed pad and main PGND plane to minimize voltage drop during peak switching currents. |
| PIN 21 / PGND (Exposed Pad) | Thermal & Power Ground | Electrically and thermally critical - must be fully soldered to ≥4-layer PCB ground plane with ≥6 thermal vias for 150°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Enables true buck-boost operation without polarity reversal or external diodes - eliminates 0.3–0.7V forward-drop losses in high-current paths. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood use (–40°C to +150°C junction), including HTOL, temperature cycling, and ESD testing per ISO 10605. |
| Programmable input UVLO with hysteresis | Configurable brown-in/out thresholds (e.g., 24V system: 22.8V turn-on, 22.7V turn-off) prevent oscillation during marginal input conditions. |
| Internal VCC LDO with 110mA limit | Eliminates need for external bias supply - powers gate drivers and logic even when VIN drops to 2.7V, sustaining regulation down to minimum input. |
| Seamless mode transitions | No output glitches or inductor current discontinuities when crossing VIN = VOUT boundary - critical for powering sensitive ADCs or RF synthesizers. |
| Output disconnect in shutdown | Internal switches isolate PVOUT from PVIN during shutdown - prevents backfeed into powered-down subsystems (e.g., infotainment domain isolation). |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24V PLC I/O Module |
|---|---|
Use Scenario: Powering MCU, CAN transceiver, and sensor interfaces from vehicle battery (9V–16V) with cold-crank immunity down to 4.5V. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 5V/3.3V rails during <1ms 4.5V transients, with seamless mode transition at VIN = VOUT. Use Value: Eliminates need for separate buck + boost stages; AEC-Q100 H-grade ensures reliability at 150°C under-hood ambient. |
Use Scenario: Generating isolated 12V and 5V rails from noisy 24V factory floor supply subject to motor switching noise and line sags. IC Role / Device Role / Timing Role: Single-chip wide-input regulator delivering regulated outputs with <100mV line regulation and 0.5% load regulation. Use Value: Reduces BOM count vs. discrete solutions; 95% efficiency minimizes heat in sealed DIN-rail enclosures. |
| FireWire (IEEE 1394) Power Delivery | Telecom Remote Radio Head (RRH) |
Use Scenario: Providing regulated 5V/1.5A power to FireWire ports from unregulated 8V–40V legacy adapters with poor voltage tolerance. IC Role / Device Role / Timing Role: Wide-VIN buck-boost converter with programmable frequency (500kHz) to avoid interference with 1394b data bands. Use Value: Supports full FireWire hot-plug specification; Burst Mode reduces standby draw to 30µA for always-on port detection. |
Use Scenario: Powering GaN PA bias and FPGA logic in outdoor RRH units exposed to –40°C to +85°C ambient with 48V PoE-derived input. IC Role / Device Role / Timing Role: High-efficiency (93% @ 24V→5V/2A) regulator operating at 1.5MHz to shrink magnetics in compact RF enclosure. Use Value: 20-lead TSSOP with exposed pad enables 3.5W dissipation without heatsink; 2.7V–40V range accommodates PoE+ voltage drop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEDD#PBF | Higher 60V input rating, 3.5A output, but larger 22-lead 7mm × 7mm DFN package and no AEC-Q100 qualification. | Preferred for >40V industrial solar or EV auxiliary supplies; unsuitable for space-constrained automotive PCBs. | Select LT8390A when input exceeds 40V or output current >2A is required; verify thermal design for non-AEC-Q100 use case. |
| TPS63060DSCR | Lower 18V max input, 2.5A output, 3mm × 2mm WSON package, and only rated to 125°C junction temperature. | Cost-optimized for consumer portable devices; lacks automotive qualification and high-voltage transient resilience. | Choose TPS63060 for cost-sensitive, non-automotive applications below 18V input where footprint is critical. |
Compared with LT8390A and TPS63060, the LTC3115HFE-2#TRPBF uniquely balances 40V operation, AEC-Q100 H-grade reliability, 20-lead TSSOP manufacturability, and seamless mode transitions - making it the optimal choice for thermally demanding automotive and industrial buck-boost applications requiring proven field reliability.
Availability
LTC3115HFE-2#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24V PLC I/O modules, and telecom remote radio heads requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC3115HFE-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 industrial, automotive, communications, and healthcare markets since 1965.
The LTC3115 product line delivers high-voltage, high-efficiency buck-boost regulators for harsh-environment power systems - designed specifically for automotive, industrial, and telecom applications demanding wide input range, fast transient response, and AEC-Q100 compliance.
FAQ
What is the maximum continuous output current capability of the LTC3115HFE-2#TRPBF?
The LTC3115HFE-2#TRPBF delivers up to 2A continuous output current in step-down operation when VIN ≥ 6V and VOUT = 5V. In buck-boost or boost modes, output current is limited by thermal design and inductor saturation; typical sustained output is 0.8A at VIN = 3.6V, VOUT = 5V. Derating applies above 100°C ambient due to its 150°C junction rating.
Does the LTC3115HFE-2#TRPBF support synchronization to an external clock source?
Yes, the LTC3115HFE-2#TRPBF supports external clock synchronization via the PWM/SYNC pin. When driven with a clean TTL/CMOS clock signal (100ns minimum pulse width, 100kHz–2MHz range), the device locks its switching frequency and phase to the external source - enabling deterministic EMI reduction and multi-phase interleaving in complex power systems.
How does the RUN pin function in the LTC3115HFE-2#TRPBF, and can it be used for custom UVLO?
The RUN pin on the LTC3115HFE-2#TRPBF serves dual functions: digital enable/disable (logic-high >1.21V enables) and programmable input undervoltage lockout. By connecting a resistor divider from PVIN to GND with the midpoint at RUN, designers set precise turn-on/turn-off thresholds - e.g., 24V system with 22.8V turn-on and 22.7V turn-off using standard 1% resistors and its 100mV hysteresis.
What thermal management practices are required for reliable operation of the LTC3115HFE-2#TRPBF at 150°C junction temperature?
To sustain 150°C junction temperature, the LTC3115HFE-2#TRPBF requires full soldering of its exposed PGND pad (Pin 21) to a multilayer PCB ground plane with ≥6 thermal vias (0.3mm diameter), minimum 25mm² copper area, and no thermal relief. Board layout must minimize trace resistance between PGND pins and ensure airflow or heatsinking for >1.5W dissipation in continuous operation.
Is the LTC3115HFE-2#TRPBF pin-compatible with other variants in the LTC3115-2 family?
Yes, the LTC3115HFE-2#TRPBF shares identical pinout and footprint with all FE-package variants (e.g., LTC3115EFE-2#TRPBF, LTC3115IFE-2#TRPBF), differing only in guaranteed temperature range and qualification level. Electrical characteristics are identical across grades; the H-grade extends operation to +150°C junction and includes AEC-Q100 documentation.
LTC3115HFE-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115HFE-2#TRPBF FAQ
1.How can I place an order for LTC3115HFE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115HFE-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 LTC3115HFE-2#TRPBF reliable?
The price and inventory of LTC3115HFE-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 LTC3115HFE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115HFE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115HFE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115HFE-2#TRPBF?
LTC3115HFE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115HFE-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 LTC3115HFE-2#TRPBF?
For technical support, including LTC3115HFE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115HFE-2#TRPBF requirements.
6.How does Aetrix verify that LTC3115HFE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115HFE-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 LTC3115HFE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115HFE-2#TRPBF?
All LTC3115HFE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115HFE-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 LTC3115HFE-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115HFE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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