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Analog Devices Inc. LTC3115EDHD-2#PBF
- Part No.:
- LTC3115EDHD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115EDHD-2#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,137
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Product details
Overview
LTC3115EDHD-2#PBF 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 LTC3115EDHD-2#PBF datasheet, LTC3115EDHD-2#PBF pinout, LTC3115EDHD-2#PBF application, or LTC3115EDHD-2#PBF equivalent, key selection criteria include input transient immunity, wide VIN/VOUT compatibility, burst-mode quiescent current (30µA), thermal performance in DFN package, and synchronization capability up to 2MHz.
Technical Context
The LTC3115EDHD-2#PBF 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 a programmable oscillator (RT-pin controlled), internal soft-start (9ms), input undervoltage lockout (2.7V threshold with 100mV hysteresis), and dual gate drivers supporting bootstrapped operation for SW1 and SW2. The device features output disconnect in shutdown and reverse current limiting (–1.5A into PVOUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery, FireWire, unregulated wall adapters, and industrial 24V/28V rails without external pre-regulation. |
| Output Voltage Range | 2.7V to 40V - enables single-supply generation of 3.3V, 5V, 12V, or 24V from variable inputs. |
| Max Output Current | 2A in step-down (VIN ≥ 6V) - sufficient for powering microcontrollers, sensors, and communication ICs in embedded systems. |
| Switching Frequency | 100kHz to 2MHz - allows trade-off between inductor size (e.g., 5.2µH at 2MHz) and EMI; synchronizable to external clock. |
| Efficiency | Up to 95% - achieved at mid-load with 1MHz switching, minimizing thermal stress in compact DFN layout. |
| Quiescent Current | 30µA in Burst Mode, 3µA in shutdown - extends battery life in always-on IoT and automotive standby applications. |
| Package | 16-lead 4mm × 5mm × 0.75mm DFN (DHD) with exposed PGND pad - provides θJA = 43°C/W for high-power density designs. |
Pinout & Package
Package: 16-lead plastic DFN (DHD), 4mm × 5mm × 0.75mm, thermally enhanced with exposed PGND pad (Pin 17) requiring solder connection to PCB ground plane for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 13) | Flying capacitor node for SW1 gate drive | Connects via 0.1µF capacitor to SW1; supplies gate voltage for high-side switch A in buck mode. |
| BST2 (Pin 12) | Flying capacitor node for SW2 gate drive | Connects via 0.1µF capacitor to SW2; supplies gate voltage for high-side switch D in boost mode. |
| PVIN (Pin 14) | Main power input for buck-boost power stage | Accepts 2.7V–40V input; requires ≥4.7µF local bypass and optional bulk capacitance for stability under high-ESR sources. |
| VIN (Pin 10) | VCC regulator input and VIN sense node | Supplies internal LDO generating VCC; used for input UVLO detection and must be decoupled with 0.1µF. |
| VC (Pin 6) | Error amplifier output | Connects to FB through compensation network (e.g., RC) to stabilize feedback loop across operating conditions. |
| FB (Pin 7) | Feedback reference input | Sets output voltage via resistor divider; nominal 1000mV reference enables precise VOUT programming (e.g., 5V = R1/R2 = 4:1). |
| RT (Pin 8) | Oscillator frequency programming | Resistor to GND sets fSW: 35.7kΩ → 1MHz; supports 100kHz–2MHz range for layout and EMI optimization. |
| PWM/SYNC (Pin 16) | Mode control and clock sync input | High = fixed-frequency PWM; low = Burst Mode; external clock ≤2MHz enables system-level timing coordination. |
| RUN (Pin 1) | Enable and UVLO threshold control | Enables IC when >1.21V; resistor divider from PVIN sets custom UVLO; 0.5µA hysteresis current prevents chatter. |
| SW1 (Pin 15) | Power switch node (switch A/B) | Connects to one end of buck-boost inductor; carries full inductor current in all operating modes. |
| SW2 (Pin 2) | Power switch node (switch C/D) | Connects to other end of buck-boost inductor; critical for boost-mode conduction and reverse current blocking. |
| PVOUT (Pin 3) | Power output node | Delivers regulated output; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with short ground return. |
| GND (Pins 4,5) | Signal ground reference | Reference for control circuitry; must be tied to clean analog ground separate from PGND planes where possible. |
| PGND (Pin 17) | Power ground (exposed pad) | Primary thermal and current return path; must be soldered to large copper area connected directly to system ground. |
| VCC / PVCC (Pins 9,11) | Internal LDO output & gate driver supply | VCC (4.45V typ) powers control logic; PVCC supplies gate drivers; pins must be shorted externally with ≥4.7µF bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Eliminates need for external MOSFETs or diodes; reduces BOM count and board area while enabling bidirectional voltage conversion. |
| Seamless mode transition | No output voltage glitch or subharmonic oscillation during VIN crossing VOUT - essential for stable power in automotive start-stop cycles. |
| Programmable Burst Mode | Reduces no-load input current to 30µA (typ), extending runtime in battery-powered telematics and sensor nodes. |
| AEC-Q100 qualified (Grade I) | Rated for –40°C to +125°C junction temperature - validated for under-hood automotive applications including infotainment and ADAS modules. |
| Integrated VCC LDO with 50mA current limit | Generates clean 4.45V rail from VIN; eliminates need for external bias supply and simplifies multi-rail system design. |
| Reverse current protection | Blocks –1.5A current flow into PVOUT during shutdown or fault - prevents backfeeding and protects downstream loads. |
Applications
| Automotive Start-Stop Systems | Industrial 24V Power Supplies |
|---|---|
Use Scenario: Maintains stable 5V/12V rail during engine cranking when battery voltage dips to 3.6V. IC Role / Device Role / Timing Role: Buck-boost regulator providing uninterrupted power to ECUs and CAN transceivers during <1ms transients. Use Value: Eliminates need for backup capacitors or secondary converters; supports AEC-Q100-compliant designs with no output dropout. |
Use Scenario: Powers PLC I/O modules from unregulated 24V industrial bus with ±20% tolerance. IC Role / Device Role / Timing Role: Wide-input DC/DC converter delivering regulated 3.3V/5V to microcontrollers and analog front-ends. Use Value: Handles brownouts and surges without reset; 40V absolute max rating prevents damage from load-dump transients. |
| FireWire Power Delivery | Multi-Source Portable Equipment |
Use Scenario: Regulates 5V/12V output from IEEE 1394 FireWire port (25–40V) for peripheral devices. IC Role / Device Role / Timing Role: High-voltage buck-boost controller converting FireWire's variable supply to fixed system rails. Use Value: Enables direct bus-powered operation without external AC/DC adapter; supports hot-plug compliance. |
Use Scenario: Accepts input from USB-C (5V), Li-ion (3.0–4.2V), or 9V wall adapter in portable test equipment. IC Role / Device Role / Timing Role: Single-chip power manager adapting to multiple input sources while maintaining constant 3.3V system rail. Use Value: Reduces design complexity vs. discrete OR-ing + regulation; enables seamless source handover without reboot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#PBF | Higher 60V input rating, 3.5A output, spread-spectrum EMI reduction; requires external bootstrap diodes. | Better suited for 48V industrial or PoE++ systems; less optimal for space-constrained automotive DFN layouts. | Choose LT8390A when input exceeds 40V or EMI compliance is critical; LTC3115EDHD-2#PBF offers smaller footprint and lower quiescent current. |
| TPS63070DDAR | Lower 16V max input, 2.4A output, integrated compensation; no programmable frequency or sync input. | Targeted at consumer battery packs (2–12V); lacks AEC-Q100 qualification and transient robustness for automotive use. | Choose TPS63070DDAR for cost-sensitive, non-automotive portable apps; LTC3115EDHD-2#PBF provides wider VIN, higher reliability, and design flexibility. |
Compared with LT8390A and TPS63070DDAR, the LTC3115EDHD-2#PBF uniquely balances 40V operation, AEC-Q100 qualification, 2MHz sync capability, and ultra-low 3µA shutdown current - making it optimal for space- and reliability-constrained automotive and industrial buck-boost applications.
Availability
LTC3115EDHD-2#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24V/28V supplies, and telecom equipment requiring stable component supply with long-term lifecycle support.
Supply support for LTC3115EDHD-2#PBF 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.
The LTC3115-2 belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC converters, designed specifically for robust, wide-input power conversion in harsh environments with rapid transients and extended temperature requirements.
FAQ
What is the maximum input voltage rating for the LTC3115EDHD-2#PBF?
The LTC3115EDHD-2#PBF has an absolute maximum input voltage rating of 45V on PVIN and VIN pins. Its operational input range is specified from 2.7V to 40V, making it suitable for 24V/28V industrial rails and automotive systems with load-dump protection. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115EDHD-2#PBF support synchronization to an external clock?
Yes, the LTC3115EDHD-2#PBF supports synchronization via its PWM/SYNC pin, accepting external clock signals from 100kHz to 2MHz. When driven by an external clock, the device operates in fixed-frequency PWM mode with seamless phase alignment - critical for noise-sensitive applications like audio or RF subsystems.
What is the thermal resistance (θJA) of the LTC3115EDHD-2#PBF in its DFN package?
The LTC3115EDHD-2#PBF in the 16-lead 4mm × 5mm DFN (DHD) package has a junction-to-ambient thermal resistance (θJA) of 43°C/W when mounted on a standard 2-layer PCB with the exposed PGND pad fully soldered to a 1-in² copper area. This value assumes proper thermal land pattern and via stitching per Analog Devices' layout guidelines.
Can the LTC3115EDHD-2#PBF operate with output voltages lower than its input voltage?
Yes, the LTC3115EDHD-2#PBF operates in buck mode when VIN > VOUT, delivering up to 2A output current for VIN ≥ 6V. Its four-switch architecture enables true buck, boost, and pass-through operation - allowing VOUT to be set independently within 2.7V–40V regardless of VIN, with seamless transitions between modes.
Is the LTC3115EDHD-2#PBF qualified for automotive applications?
Yes, the LTC3115EDHD-2#PBF is AEC-Q100 qualified for Grade I (–40°C to +125°C), meeting stringent automotive reliability standards. It is explicitly listed in Analog Devices' automotive product documentation and supports under-hood applications such as body control modules, infotainment power supplies, and ADAS camera systems.
LTC3115EDHD-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3115EDHD-2#PBF FAQ
1.How can I place an order for LTC3115EDHD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EDHD-2#PBF 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-2#PBF reliable?
The price and inventory of LTC3115EDHD-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115EDHD-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115EDHD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EDHD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EDHD-2#PBF?
LTC3115EDHD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EDHD-2#PBF 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-2#PBF?
For technical support, including LTC3115EDHD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EDHD-2#PBF requirements.
6.How does Aetrix verify that LTC3115EDHD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EDHD-2#PBF 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-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115EDHD-2#PBF?
All LTC3115EDHD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EDHD-2#PBF, 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-2#PBF part is unused and in its original packaging.
Return procedure for LTC3115EDHD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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