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Analog Devices Inc. LTC3115IDHD-2#TRPBF
- Part No.:
- LTC3115IDHD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115IDHD-2#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,262
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Product details
Overview
LTC3115IDHD-2#TRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms), featuring 2.7V–40V input/output voltage range, programmable 100kHz–2MHz switching frequency, and 95% peak efficiency. It delivers 2A in step-down mode (VIN ≥ 6V) and supports automotive power systems with AEC-Q100 qualification.
For engineers reviewing the LTC3115IDHD-2#TRPBF datasheet, LTC3115IDHD-2#TRPBF pinout, LTC3115IDHD-2#TRPBF application, or LTC3115IDHD-2#TRPBF equivalent, key selection criteria include input transient robustness, wide VIN/VOUT compatibility, Burst Mode® quiescent current (30µA), thermal performance in DFN package, and synchronization capability up to 2MHz.
Technical Context
The LTC3115IDHD-2#TRPBF implements a four-switch buck-boost topology with internal N-channel DMOS switches (150mΩ each), enabling seamless transitions between buck, boost, and pass-through modes without output disturbance. Its proprietary voltage-mode control loop maintains regulation when VIN is above, below, or equal to VOUT.
It integrates an internal LDO for VCC generation from VIN, supports external clock synchronization via PWM/SYNC pin, and features programmable input UVLO with hysteresis. The device includes reverse current limiting (−1.5A), soft-start (9ms), and overtemperature protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery, industrial rails, and unregulated adapters without pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-supply operation across diverse system rails including 3.3V, 5V, 12V, 24V. |
| Max Output Current | 2A in step-down (VIN ≥ 6V) - sufficient for powering FPGAs, microcontrollers, and sensors in compact designs. |
| Switching Frequency | 100kHz to 2MHz - allows optimization of inductor size (e.g., 5.2µH at 2MHz) and EMI filtering. |
| Peak Efficiency | 95% - minimizes thermal load in enclosed or high-ambient environments like automotive ECUs. |
| Quiescent Current | 30µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on IoT nodes and telematics modules. |
| Package | 16-lead 4mm × 5mm × 0.75mm DFN - thermally enhanced with exposed PGND pad for ≤43°C/W θJA. |
Pinout & Package
Package: 16-lead (5mm × 4mm) plastic DFN with exposed PGND pad (Pin 17), rated TJMAX = 125°C, θJA = 43°C/W, θJC = 4.3°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 13) | Flying capacitor connection for SW1 gate drive | Requires 0.1µF capacitor to SW1; enables high-side N-MOSFET drive in buck mode. |
| BST2 (Pin 12) | Flying capacitor connection for SW2 gate drive | Requires 0.1µF capacitor to SW2; enables high-side N-MOSFET drive 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 path with low-inductance layout. |
| VIN (Pin 10) | VCC regulator input and VIN sense node | Feeds internal LDO; used for input UVLO detection; bypass with 0.1µF capacitor. |
| VC (Pin 6) | Error amplifier output | Interface for compensation network (e.g., RC + capacitor) to stabilize feedback loop. |
| FB (Pin 7) | Feedback voltage input | Sets output voltage via resistor divider; nominal 1000mV reference enables precise VOUT programming. |
| RT (Pin 8) | Oscillator frequency programming | Resistor to GND sets fSW (e.g., 35.7kΩ → 1MHz); enables noise-sensitive or space-constrained tuning. |
| PWM/SYNC (Pin 16) | Mode control and external clock input | High = fixed-frequency PWM; Low = Burst Mode®; external clock sync up to 2MHz. |
| RUN (Pin 1) | Enable/disable and custom UVLO threshold | 1.21V enable threshold; 0.5µA hysteresis current; resistor divider enables accurate input brownout detection. |
| SW1 (Pin 15) | Power switch node (buck path) | Connects to one end of inductor; carries full inductor current in buck and pass-through modes. |
| SW2 (Pin 2) | Power switch node (boost path) | Connects to other end of inductor; carries full inductor current in boost and pass-through modes. |
| PVOUT (Pin 3) | Power output for regulated VOUT | Connects to output capacitor (≥10µF low-ESR); requires Schottky clamp for VOUT > 20V short-circuit protection. |
| GND (Pins 4,5) | Signal ground reference | Low-noise return for control circuitry; must be isolated from PGND except at single-point star ground. |
| PGND (Pin 17) | Power ground (exposed pad) | Primary thermal and current return path; must be soldered to large copper area for thermal dissipation. |
| VCC / PVCC (Pins 9,11) | Internal LDO output and gate driver supply | Must be shorted together; powers control logic and gate drivers; bypass with ≥4.7µF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Eliminates need for external MOSFETs or diodes; reduces BOM count and board area in 40V applications. |
| Seamless buck-boost mode transition | No output voltage glitch or subharmonic oscillation during VIN crossing VOUT - critical for stable MCU/Sensor rails. |
| Programmable input UVLO with hysteresis | Configurable brownout protection (e.g., 24V system with 22V turn-on/21.9V turn-off) prevents erratic restarts. |
| Internal soft-start (9ms) | Controls inrush current during power-up; avoids tripping upstream current limiters or fuse blowouts. |
| AEC-Q100 qualified (Grade I) | Validated for −40°C to +125°C junction temperature - suitable for under-hood automotive modules. |
| Reverse inductor current limit (−1.5A) | Prevents destructive reverse current flow during light-load boost operation or output short circuits. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers 5V/2A SoC and peripherals from 12V/24V vehicle battery with cold-crank dips to 3.6V. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining regulated 5V rail during <1ms input transients. Use Value: Prevents system reset during engine start; eliminates need for backup capacitor or secondary LDO. |
Use Scenario: Generates stable 24V output from variable 18–36V industrial DC bus for analog sensor excitation. IC Role / Device Role / Timing Role: Wide-input buck-boost converter delivering constant 24V regardless of input sag or surge. Use Value: Enables single-rail design across multiple factory floor power standards without redesign. |
| FireWire® Regulator | Multi-Source Telecom Shelf |
|
Use Scenario: Provides regulated 5V/0.8A from FireWire port (8–40V) for portable test equipment. IC Role / Device Role / Timing Role: Input-flexible DC/DC converter supporting unregulated FireWire voltage range. Use Value: Eliminates external pre-regulator; achieves >90% efficiency even at 8V input (vs. linear dropout loss). |
Use Scenario: Powers 12V FPGA subsystem from either 48V telecom rectifier or 24V battery backup. IC Role / Device Role / Timing Role: Dual-input compatible regulator accepting 24V or 48V without hardware change. Use Value: Reduces BOM variants and simplifies inventory for carrier-grade redundant power architectures. |
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#TRPBF | 40V, 3A, spread-spectrum EMI reduction, higher IQ (12µA shutdown), no integrated VCC LDO | Preferred where EMI compliance is critical (e.g., medical devices); requires external VCC bias | Select LT8390A if EMI filtering cost outweighs added complexity; LTC3115IDHD-2#TRPBF better for minimal BOM count. |
| TPS63070DDAR | 20V max input, 2.4A, lower cost, no AEC-Q100, 500kHz–2.2MHz, no reverse current limit | Suitable for consumer/portable 12V systems but not automotive or 24V+ industrial use | Choose TPS63070DDAR for cost-sensitive non-automotive designs; LTC3115IDHD-2#TRPBF required for 40V AEC-Q100 compliance. |
Compared with LT8390AEDD#TRPBF and TPS63070DDAR, the LTC3115IDHD-2#TRPBF uniquely combines AEC-Q100 qualification, integrated VCC LDO, reverse current limiting, and seamless mode transition - making it the only drop-in solution for automotive infotainment and harsh-environment 24V/40V systems requiring zero-output-glitch operation.
Availability
LTC3115IDHD-2#TRPBF is available at Aetrix Electronics and suitable for automotive power systems, industrial PLCs, FireWire® regulators, and multi-source telecom shelves requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3115IDHD-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3115-2 product line was designed specifically for high-voltage, wide-input-range buck-boost conversion in automotive and industrial environments where input transients, thermal constraints, and reliability under voltage stress are critical.
FAQ
What is the maximum continuous output current of the LTC3115IDHD-2#TRPBF?
The LTC3115IDHD-2#TRPBF delivers up to 2A continuous output current in step-down operation when VIN ≥ 6V and VOUT = 5V. At lower input voltages (e.g., VIN = 3.6V), output current is limited to 0.8A to maintain regulation and thermal safety. Peak inductor current limit is 3.0A (typical), verified per datasheet Note 3.
Does the LTC3115IDHD-2#TRPBF support synchronization to an external clock?
Yes, the LTC3115IDHD-2#TRPBF supports external clock synchronization via the PWM/SYNC pin, accepting input frequencies from 100kHz to 2MHz. When driven by an external clock, the device operates in fixed-frequency PWM mode with matched timing, reducing EMI peaks and enabling deterministic switching in multi-rail systems.
What package type and thermal characteristics does the LTC3115IDHD-2#TRPBF have?
The LTC3115IDHD-2#TRPBF uses a 16-lead 4mm × 5mm × 0.75mm DFN package with exposed PGND pad (Pin 17). Its thermal resistance is θJA = 43°C/W and θJC = 4.3°C/W. The exposed pad must be soldered to a PCB ground plane for rated thermal performance and electrical integrity.
How does the RUN pin function on the LTC3115IDHD-2#TRPBF?
The RUN pin on the LTC3115IDHD-2#TRPBF serves dual functions: enabling/disabling the IC (threshold = 1.21V typical) and setting custom input undervoltage lockout via resistor divider. It sources 0.5µA hysteresis current once enabled, ensuring clean startup and preventing oscillation near UVLO threshold.
Is the LTC3115IDHD-2#TRPBF qualified for automotive applications?
Yes, the LTC3115IDHD-2#TRPBF is AEC-Q100 qualified for Grade I (−40°C to +125°C junction temperature) and specified for automotive power systems. Its design includes input transient immunity (<1ms), reverse current limiting, and robust thermal performance - validated per Automotive Reliability reports.
LTC3115IDHD-2#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:
- 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:
- 16-DFN (5x4)
LTC3115IDHD-2#TRPBF FAQ
1.How can I place an order for LTC3115IDHD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IDHD-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 LTC3115IDHD-2#TRPBF reliable?
The price and inventory of LTC3115IDHD-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 LTC3115IDHD-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115IDHD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IDHD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IDHD-2#TRPBF?
LTC3115IDHD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IDHD-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 LTC3115IDHD-2#TRPBF?
For technical support, including LTC3115IDHD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IDHD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3115IDHD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IDHD-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 LTC3115IDHD-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115IDHD-2#TRPBF?
All LTC3115IDHD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IDHD-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 LTC3115IDHD-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115IDHD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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