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Analog Devices Inc. LTC3115IDHD-1#TRPBF
- Part No.:
- LTC3115IDHD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115IDHD-1#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1A/2A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
LTC3115IDHD-1#TRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter in a 16-lead 4mm × 5mm DFN package. It supports input/output voltages from 2.7V to 40V, delivers up to 2A in step-down mode (VIN ≥ 6V), operates at programmable frequencies up to 2MHz, and features Burst Mode® for 30µA no-load quiescent current - ideal for automotive power systems with wide-input battery rails.
For engineers reviewing the LTC3115IDHD-1#TRPBF datasheet, LTC3115IDHD-1#TRPBF pinout, LTC3115IDHD-1#TRPBF application, or LTC3115IDHD-1#TRPBF equivalent, key selection criteria include its seamless buck-boost mode transitions, AEC-Q100 qualification, 3µA shutdown current, internal soft-start, and support for external clock synchronization up to 2MHz.
Technical Context
The LTC3115IDHD-1#TRPBF implements a proprietary four-switch synchronous buck-boost topology with integrated N-channel DMOS power switches (150mΩ each) and high-side gate drivers requiring only two external 0.1µF bootstrap capacitors. Its voltage-mode control loop enables stable regulation across VIN = VOUT, VIN < VOUT (boost), and VIN > VOUT (buck) without subharmonic oscillation or output transients.
It features dual operating modes: fixed-frequency PWM (100kHz–2MHz, selectable via RT resistor or external clock on PWM/SYNC) and low-noise Burst Mode® for light-load efficiency. Input undervoltage lockout is programmable via RUN pin divider, and internal VCC LDO regulates from VIN to 4.45V for gate drive and control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports 12V/24V/28V automotive batteries, FireWire, and unregulated industrial rails without 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), 1A in buck-boost (VIN ≥ 3.6V @ VOUT = 5V) - sufficient for powering microcontrollers, sensors, and interface ICs. |
| Switching Frequency | 100kHz to 2MHz - allows optimization between inductor size (e.g., 5.2µH at 2MHz) and efficiency (peak 95% at 1MHz). |
| Quiescent Current | 30µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on telematics or ECU standby circuits. |
| Efficiency | Up to 95% at 1A/5V output - minimizes thermal stress in sealed automotive enclosures. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q100 Grade I for under-hood and infotainment applications. |
Pinout & Package
Package: 16-lead 4mm × 5mm × 0.75mm plastic DFN (DHD) with exposed PGND pad (Pin 17), thermally enhanced for ≤43°C/W θJA. Requires soldering of exposed pad to PCB ground plane for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM/SYNC (16) | Mode control & sync input | High = fixed-frequency PWM; low = Burst Mode®; external 100ns+ clock edge synchronizes switching up to 2MHz. |
| SW1 (15), SW2 (2) | Power switch nodes | Connect to opposite ends of buck-boost inductor; SW1 interfaces with PVIN, SW2 with PVOUT - defines 4-switch conduction paths. |
| PVIN (14), PVOUT (3) | Main power terminals | PVIN supplies input energy; PVOUT delivers regulated output - both require ≥4.7µF low-ESR ceramic bypass capacitors placed adjacent to pins. |
| BST1 (13), BST2 (12) | Bootstrap capacitor connections | Each requires 0.1µF ceramic cap to respective SW pin - generates floating gate drive voltage for high-side N-MOSFETs A and D. |
| RT (8) | Oscillator frequency set | Resistor to GND sets fSW: 35.7kΩ → 1MHz; supports 100kHz–2MHz range for layout miniaturization or EMI reduction. |
| RUN (1) | Enable & UVLO programming | 1.21V threshold enables IC; resistor divider from VIN sets custom input undervoltage lockout with 100mV hysteresis. |
| FB (7) | Voltage feedback input | 1000mV nominal reference - resistor divider from PVOUT to GND sets output voltage with ±0.3% line/load regulation. |
| PGND (17), GND (4,5) | Power & signal ground | Exposed pad (Pin 17) is primary PGND return for power switches; Pins 4/5 are low-noise signal ground for control circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitches and inductor current discontinuities when VIN crosses VOUT - critical for stable MCU supply during cold-crank events. |
| Internal VCC LDO regulator | Generates 4.45V ±1.2% from VIN to power gate drivers and control logic - removes need for external bias rail and simplifies BOM. |
| Programmable input UVLO | Custom threshold set via RUN pin divider - enables precise brown-out protection aligned with battery discharge curves (e.g., 9V cutoff for 12V lead-acid). |
| Output disconnect in shutdown | Prevents backfeed from PVOUT to PVIN when disabled - protects upstream sources and meets automotive reverse-battery fault requirements. |
| Short-circuit & reverse-current protection | Hardware-limited 1.5A reverse inductor current and cycle-by-cycle current limiting - sustains operation during load dumps or output shorts without latch-off. |
Applications
| Automotive Infotainment Power | Industrial 24V Field Bus Node |
|---|---|
Use Scenario: Powering DSP, display controller, and USB hub from vehicle battery (6V–16V) with cold-crank immunity down to 3.6V. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/2A with seamless mode transition during engine start. Use Value: Maintains system operation below 6V input without output dropout or reset - eliminates need for backup supercapacitor. | Use Scenario: Converting 24V industrial rail to isolated 3.3V for RS-485 transceivers and microcontroller in PLC I/O modules. IC Role / Device Role / Timing Role: Non-isolated intermediate regulator with programmable UVLO to tolerate 24V rail sag during motor startup. Use Value: 40V absolute max rating withstands 36V transients; 125°C operation survives enclosure temperatures in factory environments. |
| FireWire Regulator | Multi-Source Portable Equipment |
Use Scenario: Regulating FireWire bus (8V–40V) to 5V for IEEE 1394 PHY and link layer ICs in camcorders and audio interfaces. IC Role / Device Role / Timing Role: Wide-input buck-boost converter supporting dynamic FireWire cable insertion/removal without reconfiguration. Use Value: 2.7V–40V range accommodates full FireWire specification; Burst Mode® reduces idle power to extend battery runtime. | Use Scenario: Power management in portable test equipment accepting USB-C (5V), Li-ion (3.0–4.2V), or 9V wall adapter inputs. IC Role / Device Role / Timing Role: Single-chip solution eliminating multiple regulators and enabling automatic source selection via input voltage range. Use Value: Eliminates external OR-ing FETs and sequencing logic; 3µA shutdown current preserves battery charge during storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEDD#PBF | Higher 60V input rating, 3.5A output, spread-spectrum EMI reduction; requires external MOSFETs and more complex compensation. | Targeted at high-power industrial converters (>15W); lacks integrated gate drivers and bootstrapping simplicity. | Select when input exceeds 40V or output current >2A is required; avoid if board space or design cycle time is constrained. |
| TPS63060DSCR | Lower 18V max input, 2.5A output, fixed 2.5MHz switching; no programmable UVLO, no external sync, not AEC-Q100 qualified. | Suitable for consumer portable devices; insufficient for automotive transients or 24V industrial rails. | Consider only for cost-sensitive non-automotive designs with strict size limits and ≤18V input - not a drop-in replacement. |
Compared with LT8390A and TPS63060, the LTC3115IDHD-1#TRPBF offers optimal balance of integration (4-switch + gate drivers + VCC LDO), automotive qualification, and wide 2.7V–40V operation - reducing component count and validation effort for mid-power 12V/24V systems.
Availability
LTC3115IDHD-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V fieldbus nodes, FireWire-powered peripherals, and multi-source portable equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3115IDHD-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, and automotive safety markets.
The LTC3115-1 product line delivers highly integrated, wide-input buck-boost converters designed specifically for automotive and industrial power systems where input voltage varies widely and reliability under extreme conditions is mandatory.
FAQ
What is the maximum output current capability of the LTC3115IDHD-1#TRPBF?
The LTC3115IDHD-1#TRPBF delivers up to 2A output current in step-down operation when VIN ≥ 6V and VOUT = 5V. In buck-boost mode (e.g., VIN = 3.6V, VOUT = 5V), it sustains 1A continuous output. Peak inductor current limit is 3.0A (typical), with hardware protection against overcurrent and reverse conduction.
Does the LTC3115IDHD-1#TRPBF support synchronization to an external clock?
Yes, the LTC3115IDHD-1#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 to the external source - enabling EMI reduction through frequency dithering or alignment with system timing domains.
Is the LTC3115IDHD-1#TRPBF qualified for automotive applications?
Yes, the LTC3115IDHD-1#TRPBF is AEC-Q100 Grade I qualified (–40°C to +125°C junction temperature) and manufactured with controlled processes for automotive use. It includes features critical for automotive systems: output disconnect in shutdown, robust input UVLO programming, and guaranteed operation across cold-crank (3.6V) and load-dump (40V) conditions.
How does the LTC3115IDHD-1#TRPBF achieve seamless mode transitions?
The LTC3115IDHD-1#TRPBF uses a proprietary four-switch control algorithm that continuously monitors VIN and VOUT to adjust duty cycles and switch states without interrupting regulation. This eliminates output voltage glitches, inductor current discontinuities, and subharmonic oscillation - ensuring stable 5V supply even as battery voltage crosses the output setpoint during engine cranking.
What is the purpose of the BST1 and BST2 pins on the LTC3115IDHD-1#TRPBF?
The BST1 and BST2 pins on the LTC3115IDHD-1#TRPBF serve as bootstrap capacitor connections for the high-side N-channel MOSFET gate drivers. Each requires a 0.1µF ceramic capacitor tied between BSTx and its corresponding SWx pin (SW1 or SW2) to generate the floating gate drive voltage needed to fully enhance the top switches in the 4-switch buck-boost power stage.
LTC3115IDHD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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:
- 16-DFN (5x4)
LTC3115IDHD-1#TRPBF FAQ
1.How can I place an order for LTC3115IDHD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IDHD-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 LTC3115IDHD-1#TRPBF reliable?
The price and inventory of LTC3115IDHD-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 LTC3115IDHD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115IDHD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IDHD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IDHD-1#TRPBF?
LTC3115IDHD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IDHD-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 LTC3115IDHD-1#TRPBF?
For technical support, including LTC3115IDHD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IDHD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3115IDHD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IDHD-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 LTC3115IDHD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115IDHD-1#TRPBF?
All LTC3115IDHD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IDHD-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 LTC3115IDHD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115IDHD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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