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Analog Devices Inc. LTC3115IDHD-1#WTRPBF
- Part No.:
- LTC3115IDHD-1#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115IDHD-1#WTRPBF.pdf
- Description:
- IC REG BUCK BST ADJ 1A/2A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,891
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Product details
Overview
LTC3115IDHD-1#WTRPBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter in a thermally enhanced 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), operates at programmable frequencies from 100kHz to 2MHz, and features ultralow-noise PWM switching-enabling robust power conversion in automotive battery systems with wide voltage transients.
For engineers reviewing the LTC3115IDHD-1#WTRPBF datasheet, LTC3115IDHD-1#WTRPBF pinout, LTC3115IDHD-1#WTRPBF application, or LTC3115IDHD-1#WTRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 3µA shutdown current, 30µA no-load quiescent current in Burst Mode®, internal soft-start, and seamless buck/boost/buck-boost mode transitions without output disturbance.
Technical Context
The LTC3115IDHD-1#WTRPBF 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 uses a 1000mV feedback reference and supports both internal oscillator (RT-programmable) and external clock synchronization via the PWM/SYNC pin.
It features dual operating modes: fixed-frequency PWM (low-noise, high-efficiency, up to 95%) and Burst Mode® (30µA no-load IQ, optimized for battery standby). Input undervoltage lockout is programmable via the RUN pin, and reverse inductor current limiting (–1.5A) prevents backfeeding during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports cold-crank (4.5V) and load-dump (36V+) in 12V/24V automotive systems |
| Output Voltage Range | 2.7V to 40V - enables single-rail regulation across wide-input sources like FireWire or unregulated adapters |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - sufficient for powering microcontrollers, sensors, and CAN transceivers |
| Switching Frequency | 100kHz to 2MHz - selectable via RT resistor; 2MHz operation allows <10µH inductors for space-constrained PCBs |
| Efficiency | Up to 95% - achieved at mid-load in PWM mode, critical for thermal management in sealed enclosures |
| Quiescent Current | 30µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on telematics modules |
| Feedback Reference | 1000mV ±23mV - enables precise output setting with standard resistor dividers (e.g., 5V = 10kΩ/20kΩ) |
Pinout & Package
Package: 16-lead (5mm × 4mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 17), rated for –40°C to +125°C junction temperature (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM/SYNC | Mode control & sync input | High = fixed-frequency PWM; low = Burst Mode®; external clock input up to 2MHz synchronizes switching |
| SW1 / SW2 | Power switch terminals | Connect to opposite ends of buck-boost inductor; support bidirectional current flow for seamless mode transitions |
| PVIN / PVOUT | Main power input/output rails | Require ≥4.7µF ceramic bypass (PVIN) and ≥10µF low-ESR capacitor (PVOUT); PVOUT must be protected with Schottky diode if VOUT > 20V |
| BST1 / BST2 | Bootstrap capacitor connections | Each requires 0.1µF ceramic cap to SW1/SW2; enables high-side N-FET gate drive without external charge pump |
| FB | Voltage feedback input | 1000mV reference; resistor divider sets output voltage; sensitive to noise-must be routed away from SW pins |
| RUN | Enable & UVLO programming | 1.21V threshold with 100mV hysteresis; driven by resistor divider from VIN to set custom undervoltage lockout |
| PGND (exposed pad) | Power ground return | Exposed pad (Pin 17) must be soldered to PCB ground plane with multiple vias for thermal and low-impedance path |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Eliminates output voltage glitch and subharmonic oscillation when VIN crosses VOUT-critical for uninterrupted MCU operation |
| AEC-Q100 Grade I qualified | Validated for automotive applications including engine control units and ADAS power supplies with –40°C to +125°C operation |
| Internal soft-start | 9ms controlled ramp prevents inrush current into output capacitors-reduces stress on input source and output rail |
| Reverse current blocking | Prevents backfeed from PVOUT to PVIN during shutdown or fault; supports OR-ing and hot-swap configurations |
| Short-circuit protection | Current-limited operation with automatic recovery after fault removal-no latch-up or manual reset required |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Field Bus Node |
|---|---|
Use Scenario: Powering display controllers, audio codecs, and USB hubs from a 12V vehicle battery subject to 4V–36V transients. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/3.3V rails with dynamic input range handling. Use Value: Eliminates need for pre-regulator stages; maintains regulation during cold-crank (4.5V) and load-dump (36V) events per ISO 7637-2. | Use Scenario: Providing isolated 5V and 12V rails for RS-485 transceivers, PLC I/O modules, and sensor interfaces on 24V industrial bus lines. IC Role / Device Role / Timing Role: Wide-input DC/DC converter enabling direct connection to unregulated 24V supply with ±25% tolerance. Use Value: Supports brownout-free operation down to 2.7V input-ensures uptime during factory line voltage sags. |
| FireWire Regulator | Multi-Source Portable Equipment |
Use Scenario: Regulating FireWire (IEEE 1394) bus power (8–40V) to 3.3V/5V for embedded host controllers. IC Role / Device Role / Timing Role: Input-flexible buck-boost converter eliminating discrete pre-regulation and post-regulation stages. Use Value: Single-chip solution meets FireWire spec's wide input requirement while achieving >90% efficiency at 1A load. | Use Scenario: Power management in portable test equipment accepting USB-C PD (5–20V), Li-ion battery (3–4.2V), or wall adapter (9–24V). IC Role / Device Role / Timing Role: Universal input DC/DC core enabling plug-and-play compatibility across diverse power sources. Use Value: Reduces BOM count by replacing three dedicated regulators (buck, boost, SEPIC) with one footprint-optimized IC. |
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 | Better suited for 48V industrial systems; lacks integrated switches and Burst Mode® ultra-low IQ | Select when input exceeds 40V or >2A continuous output is required; accept larger solution size and higher BOM cost |
| TPS63070DDCR | Lower 16V max input, 2.4A output, 2.5MHz max frequency; smaller 2mm × 2mm QFN package | Optimized for compact consumer electronics; not AEC-Q100 qualified or automotive temperature rated | Select for space-constrained non-automotive designs where input stays below 16V and qualification is unnecessary |
Compared with LT8390AEDD#PBF and TPS63070DDCR, the LTC3115IDHD-1#WTRPBF uniquely balances 40V operation, AEC-Q100 compliance, 3µA shutdown, and fully integrated switches-making it the optimal choice for automotive and industrial buck-boost applications demanding reliability, wide VIN, and minimal external components.
Availability
LTC3115IDHD-1#WTRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V field bus nodes, FireWire regulators, and multi-source portable equipment requiring stable component supply with full automotive-grade traceability.
Supply support for LTC3115IDHD-1#WTRPBF 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 high-reliability, wide-input-voltage DC/DC conversion in automotive and industrial environments-emphasizing seamless mode transitions, low quiescent current, and AEC-Q100 qualification.
FAQ
What is the maximum recommended input voltage for the LTC3115IDHD-1#WTRPBF?
The absolute maximum input voltage rating for the LTC3115IDHD-1#WTRPBF is 45V on PVIN and VIN pins. However, the specified operational input range is 2.7V to 40V. Sustained operation above 40V risks exceeding safe operating area limits and may degrade long-term reliability. For automotive load-dump immunity, the device is validated per ISO 7637-2 with external clamping, but internal circuitry must remain within 40V continuous rating. Always refer to the Absolute Maximum Ratings table in the official datasheet for derating guidance.
Does the LTC3115IDHD-1#WTRPBF support output voltages lower than its input voltage?
Yes, the LTC3115IDHD-1#WTRPBF supports true buck operation-delivering output voltages lower than input (e.g., 5V from 24V) with up to 2A output current when VIN ≥ 6V. Its four-switch synchronous architecture enables efficient step-down without external diodes or complex control schemes. The device automatically transitions between buck, boost, and buck-boost modes based on input-output relationship, maintaining regulation and low ripple throughout.
How is the switching frequency set on the LTC3115IDHD-1#WTRPBF?
The switching frequency of the LTC3115IDHD-1#WTRPBF is set using an external resistor (RT) connected between the RT pin (Pin 8) and ground. With RT = 35.7kΩ, the typical frequency is 1MHz; values from ~10kΩ to 200kΩ yield 2MHz to 100kHz respectively. The device also supports synchronization to an external clock applied to the PWM/SYNC pin, allowing precise timing alignment in multi-rail systems or EMI-sensitive designs.
Is the LTC3115IDHD-1#WTRPBF pin-compatible with other variants in the LTC3115-1 family?
Yes, the LTC3115IDHD-1#WTRPBF shares identical pinout and footprint with all DHD-package variants of the LTC3115-1 family-including LTC3115EDHD-1#PBF, LTC3115EDHD-1#WTRPBF, and LTC3115IDHD-1#PBF. Temperature grade (E/I) and automotive suffix (#W) do not affect mechanical or electrical pin compatibility. However, ensure matching operating temperature range and qualification status (e.g., #W suffix required for automotive use) when substituting.
What thermal considerations apply to the LTC3115IDHD-1#WTRPBF in a 2A load application?
At 2A output with 24V input and 5V output, the LTC3115IDHD-1#WTRPBF dissipates ~1.2W typical. With θJA = 43°C/W and a 4cm² 2-oz copper thermal pad connected to the exposed PGND pad via ≥6 thermal vias, ambient temperature must stay below ~85°C to maintain junction temperature ≤125°C. Use the formula TJ = TA + (PD × θJA) for layout-specific estimation. Derate output current above 85°C ambient per the thermal performance curves in the datasheet.
LTC3115IDHD-1#WTRPBF 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):
- 2.7V
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3115IDHD-1#WTRPBF FAQ
1.How can I place an order for LTC3115IDHD-1#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IDHD-1#WTRPBF 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#WTRPBF reliable?
The price and inventory of LTC3115IDHD-1#WTRPBF 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#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115IDHD-1#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IDHD-1#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IDHD-1#WTRPBF?
LTC3115IDHD-1#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IDHD-1#WTRPBF 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#WTRPBF?
For technical support, including LTC3115IDHD-1#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IDHD-1#WTRPBF requirements.
6.How does Aetrix verify that LTC3115IDHD-1#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IDHD-1#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115IDHD-1#WTRPBF?
All LTC3115IDHD-1#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IDHD-1#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LTC3115IDHD-1#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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