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Analog Devices Inc. LTC3115EDHD-1#TRPBF
- Part No.:
- LTC3115EDHD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115EDHD-1#TRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1A/2A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,331
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Product details
Overview
LTC3115EDHD-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 2.7V–40V input and output ranges, delivers up to 2A in step-down mode (VIN ≥ 6V), achieves up to 95% efficiency, and features programmable 100kHz–2MHz switching with external clock synchronization - ideal for automotive power systems requiring wide-input compatibility and seamless mode transitions.
For engineers reviewing the LTC3115EDHD-1#TRPBF datasheet, LTC3115EDHD-1#TRPBF pinout, LTC3115EDHD-1#TRPBF application, or LTC3115EDHD-1#TRPBF equivalent, key selection criteria include its 2.7V–40V bidirectional voltage range, 3µA shutdown current, Burst Mode® operation with 50µA no-load quiescent current, internal soft-start, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3115EDHD-1#TRPBF implements a proprietary four-switch buck-boost topology with integrated N-channel DMOS power switches (150mΩ each), enabling continuous regulation when VIN is above, below, or equal to VOUT. Its voltage-mode control loop and low-noise PWM algorithm eliminate subharmonic oscillation and ensure transient-free mode transitions.
It integrates a 4.45V VCC regulator powered from VIN, supports external RT-resistor programming (35.7kΩ sets 1MHz), and provides dual gate-drive bootstrapping (BST1/BST2) for high-side switch control. The RUN pin enables precise UVLO threshold setting via resistor divider, and PWM/SYNC allows pin-selectable Burst Mode® or synchronized fixed-frequency PWM operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery, FireWire, and unregulated industrial rails without pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-supply generation of 3.3V, 5V, 12V, 24V, or 32V from variable sources. |
| Max Output Current | 2A in step-down (VIN ≥ 6V); 1A in buck-boost (VIN ≥ 3.6V, VOUT = 5V) - defines usable load capacity under real operating constraints. |
| Switching Frequency | 100kHz to 2MHz - adjustable via RT pin; higher frequencies allow smaller inductors (e.g., 5.2µH at 2MHz) for space-constrained designs. |
| Efficiency | Up to 95% - measured at VOUT = 5V, fSW = 1MHz, VIN = 12V/24V, ILOAD = 1A; enables thermally constrained automotive modules. |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on vehicle subsystems like telematics or CAN gateways. |
| Package | 16-lead 4mm × 5mm × 0.75mm DFN with exposed PGND pad - provides θJA = 43°C/W thermal performance for conduction-cooled PCB layouts. |
Pinout & Package
Package: 16-lead plastic DFN (DHD), 4mm × 5mm × 0.75mm, exposed thermal pad (Pin 17) connected to PGND. Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJC = 4.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 13) | Flying capacitor connection for SW1 gate drive | Must connect 0.1µF capacitor to SW1; enables high-side N-channel switch A operation in buck mode. |
| BST2 (Pin 12) | Flying capacitor connection for SW2 gate drive | Must connect 0.1µF capacitor to SW2; enables high-side N-channel switch D operation in boost mode. |
| PVIN (Pin 14) | Main power input for buck-boost power stage | Connects to bulk input capacitor (≥4.7µF); handles full input current; requires low-inductance path to ground. |
| VIN (Pin 10) | VCC regulator input and VIN sense node | Supplies internal LDO; used for input UVLO detection; bypass with 0.1µF capacitor close to pin. |
| VC (Pin 6) | Error amplifier output | Interface for Type II/III compensation network between VC and FB; determines loop stability and transient response. |
| FB (Pin 7) | Feedback input for output voltage regulation | 1000mV reference; resistor divider from VOUT to GND sets regulated output; sensitive to noise coupling. |
| RT (Pin 8) | Oscillator frequency programming | Resistor to GND sets fSW (e.g., 35.7kΩ → 1MHz); tolerance directly impacts timing accuracy and EMI profile. |
| PWM/SYNC (Pin 16) | Mode control and external clock input | High = fixed-frequency PWM; Low = Burst Mode®; external 100ns+ clock edge synchronizes switching up to 2MHz. |
| RUN (Pin 1) | Enable/disable and custom UVLO control | 1.21V threshold; 0.5µA hysteresis current enables resistor-divider UVLO setting; tied to VIN for always-on operation. |
| PGND (Pin 17) | Power ground return for switches and drivers | Exposed thermal pad - must be soldered to PCB ground plane with multiple vias for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitches and inductor current discontinuities during VIN/VOUT crossover - critical for powering microcontrollers during cold-crank events. |
| Integrated 4-switch power stage | Four 150mΩ N-channel DMOS switches reduce BOM count and PCB area vs discrete solutions; eliminates external high-side driver complexity. |
| Programmable 100kHz–2MHz switching | Enables optimization between efficiency (lower fSW) and size (higher fSW); supports EMI filtering with fixed-frequency PWM or spread-spectrum sync. |
| 3µA shutdown supply current | Meets ultra-low-power requirements for automotive infotainment standby modes and remote keyless entry receivers. |
| AEC-Q100 Grade E qualification | Rated for –40°C to +125°C junction temperature; qualified per stress test standards for automotive powertrain and body electronics applications. |
Applications
| Automotive Cold-Crank Power Supply | Industrial Dual-Rail Converter |
|---|---|
|
Use Scenario: Maintaining stable 5V/3.3V output during engine start when battery voltage dips to 3.6V while nominal rail is 12V/24V. IC Role / Device Role / Timing Role: Buck-boost regulator providing uninterrupted power to ADAS camera modules and radar processors. Use Value: Seamless mode transition prevents reset events; 2A capability supports multi-sensor fusion units without derating. |
Use Scenario: Generating isolated ±15V rails from a single 24V industrial bus for analog signal conditioning in PLC I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck-boost stage feeding downstream isolated DC/DC converters. Use Value: 40V absolute max rating tolerates 36V transients on 24V bus; 95% efficiency reduces heat sink requirements in sealed enclosures. |
| FireWire Regulator | Multi-Source Battery Backup System |
|
Use Scenario: Converting unregulated FireWire port voltage (8–40V) to stable 3.3V for IEEE 1394 PHY and link-layer controllers. IC Role / Device Role / Timing Role: Input-flexible DC/DC front-end ensuring compliance with FireWire power specification across all host devices. Use Value: Wide 2.7V–40V range accepts worst-case FireWire under-voltage (8V) and over-voltage (40V) conditions without protection circuitry. |
Use Scenario: Powering IoT gateway during AC failure using LiFePO₄ (2.5–3.65V/cell) or supercapacitor (0–2.7V) backup sources. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing charge/discharge paths and maintaining system VDD during source switchover. Use Value: 2.7V minimum input supports deeply discharged backup cells; 50µA Burst Mode® current extends hold-up time by >3× vs standard PWM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20404ATPA+T | 36V max input, 3.5A output, integrated inductor option; no BST pins - uses internal charge pump. | Targeted at space-constrained consumer wearables; lacks AEC-Q100 qualification and 40V robustness. | Select for compact, low-cost portable designs where 36V rating suffices and layout simplicity outweighs automotive compliance needs. |
| TPS63020DSJR | 18V max input, 2.5A output, 2.5MHz max fSW; smaller 2mm × 2mm QFN; no programmable UVLO or SYNC pin. | Optimized for USB-powered portable electronics; unsuitable for 24V/40V industrial or automotive inputs. | Choose for battery-powered handheld devices needing minimal footprint and high-frequency operation below 18V input. |
Compared with MAX20404ATPA+T and TPS63020DSJR, the LTC3115EDHD-1#TRPBF offers superior 40V input tolerance, AEC-Q100 qualification, and flexible UVLO/SYNC control - making it the only viable choice for automotive cold-crank and industrial 24V/36V transient environments.
Availability
LTC3115EDHD-1#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, industrial dual-rail converters, FireWire regulators, and multi-source battery backup systems requiring stable component supply with long-term lifecycle support.
Supply support for LTC3115EDHD-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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC3115-1 product line was designed specifically for wide-input automotive and industrial power conversion, emphasizing seamless buck-boost operation, low quiescent current, and robust thermal performance in harsh environments.
FAQ
What is the maximum input voltage rating for the LTC3115EDHD-1#TRPBF?
The LTC3115EDHD-1#TRPBF has an absolute maximum input voltage rating of 45V on PVIN and VIN pins, with guaranteed operation up to 40V across the full –40°C to +125°C junction temperature range. This 40V operational limit enables reliable use with 24V/28V industrial buses and automotive 12V/24V systems experiencing load-dump transients.
Does the LTC3115EDHD-1#TRPBF support synchronization to an external clock?
Yes, the LTC3115EDHD-1#TRPBF supports external clock synchronization via the PWM/SYNC pin. When driven with a clean square wave (100ns minimum pulse width, 100kHz–2MHz range), the device locks its switching frequency and phase to the external source - enabling EMI reduction in noise-sensitive automotive and medical applications.
What is the purpose of the BST1 and BST2 pins on the LTC3115EDHD-1#TRPBF?
BST1 and BST2 are bootstrap capacitor terminals for high-side N-channel MOSFET gate drives. BST1 connects to SW1 via a 0.1µF capacitor to enable switch A in buck mode; BST2 connects to SW2 to enable switch D in boost mode. These pins eliminate need for external high-voltage gate drivers and reduce solution size.
Can the LTC3115EDHD-1#TRPBF operate with an input voltage lower than the output voltage?
Yes, the LTC3115EDHD-1#TRPBF operates seamlessly in boost mode when VIN < VOUT (e.g., 3.6V input to 5V output), in buck mode when VIN > VOUT (e.g., 24V input to 5V output), and in buck-boost mode when VIN ≈ VOUT. Its proprietary control algorithm ensures continuous regulation and zero-crossing transition without output disturbance.
Is the LTC3115EDHD-1#TRPBF qualified for automotive applications?
Yes, the LTC3115EDHD-1#TRPBF is AEC-Q100 Grade E qualified (–40°C to +125°C) and specified for automotive power systems. It meets stringent reliability, thermal, and ESD requirements for use in body electronics, infotainment, ADAS, and telematics modules where cold-crank and load-dump immunity are mandatory.
LTC3115EDHD-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)
LTC3115EDHD-1#TRPBF FAQ
1.How can I place an order for LTC3115EDHD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EDHD-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 LTC3115EDHD-1#TRPBF reliable?
The price and inventory of LTC3115EDHD-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 LTC3115EDHD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115EDHD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EDHD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EDHD-1#TRPBF?
LTC3115EDHD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EDHD-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 LTC3115EDHD-1#TRPBF?
For technical support, including LTC3115EDHD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EDHD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3115EDHD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EDHD-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 LTC3115EDHD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115EDHD-1#TRPBF?
All LTC3115EDHD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EDHD-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 LTC3115EDHD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115EDHD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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