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Analog Devices Inc. LTC3115IDHD-1#PBF
- Part No.:
- LTC3115IDHD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115IDHD-1#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1A/2A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LTC3115IDHD-1#PBF 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), and operates with programmable switching frequency from 100kHz to 2MHz. It is used in automotive power systems where wide VIN/VOUT range and AEC-Q100-compatibility are required.
For engineers reviewing the LTC3115IDHD-1#PBF datasheet, LTC3115IDHD-1#PBF pinout, LTC3115IDHD-1#PBF application, or LTC3115IDHD-1#PBF equivalent, key selection criteria include its 2.7–40V bidirectional voltage range, 3µA shutdown current, Burst Mode® operation for ultra-low quiescent current, thermal performance in the DHD package, and compatibility with external clock synchronization up to 2MHz.
Technical Context
The LTC3115IDHD-1#PBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each) and proprietary low-noise PWM control. Its voltage-mode control loop enables seamless transitions between buck, boost, and pass-through modes without output transients or subharmonic oscillation.
It integrates an internal VCC LDO (regulated at 4.45V), programmable input UVLO (2.7V threshold, 100mV hysteresis), and dual flying capacitor gate drive circuitry (BST1/BST2). The device supports both fixed-frequency PWM and ultralow-quiescent-current Burst Mode® operation, with soft-start duration of 9ms and reverse inductor current limiting at –1.5A.
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 inputs. |
| Max Output Current | 2A in step-down (VIN ≥ 6V) - sufficient for powering microcontrollers, sensors, and communication ICs in automotive ECUs. |
| Switching Frequency | 100kHz to 2MHz - selectable via RT resistor; higher frequencies allow smaller inductors (e.g., 5.2µH at 2MHz). |
| Shutdown Current | 3µA typical - extends battery life in always-on vehicle modules like telematics or CAN gateways. |
| Burst Mode IQ | 30µA no-load quiescent current - maintains regulation while minimizing standby loss in infotainment subsystems. |
| Efficiency | Up to 95% - achieved at mid-load in PWM mode; critical for thermal management in sealed enclosures. |
| Package | 16-lead 4mm × 5mm × 0.75mm DFN with exposed PGND pad - θJA = 43°C/W; requires PCB soldering of exposed pad for thermal compliance. |
Pinout & Package
Package: 16-lead (5mm × 4mm) plastic DFN (DHD), thermally enhanced with exposed PGND pad (Pin 17) that must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM/SYNC (16) | Mode control & sync input | High = fixed-frequency PWM; low = Burst Mode; external clock input up to 2MHz; logic threshold 0.5–1.5V. |
| SW1 (15) | Power switch node A | Connects to one end of buck-boost inductor; drives high-side switch A and low-side switch B in buck mode. |
| PVIN (14) | Main power input rail | Accepts 2.7–40V input; requires ≥4.7µF local ceramic bypass; bulk cap (47–100µF) recommended for long leads. |
| BST1 (13) | Flying capacitor connection for SW1 | Connects via 0.1µF capacitor to SW1; generates gate drive voltage for high-side switch A. |
| BST2 (12) | Flying capacitor connection for SW2 | Connects via 0.1µF capacitor to SW2; generates gate drive voltage for high-side switch D. |
| PVCC (11) | VCC regulator output | Internal LDO output (4.45V); powers gate drivers and must be shorted to VCC pin externally. |
| VIN (10) | VCC regulator input | Supplies internal VCC LDO; senses input for UVLO; requires 0.1µF local bypass. |
| VCC (9) | IC control supply | Must be connected directly to PVCC; powers internal logic; bypass with ≥4.7µF capacitor. |
| RUN (1) | Enable & UVLO programming | Enables IC when >1.21V; 0.5µA hysteresis current allows resistor-divider UVLO setting (e.g., 2.7V threshold). |
| SW2 (2) | Power switch node B | Connects to other end of buck-boost inductor; drives low-side switch C and high-side switch D in boost mode. |
| PVOUT (3) | Power output rail | Delivers regulated output; requires ≥10µF low-ESR ceramic cap; Schottky diode recommended for VOUT >20V short-circuit protection. |
| GND (4,5) | Signal ground reference | Reference for FB, VC, RT, RUN; must be isolated from PGND traces to avoid noise coupling into feedback path. |
| VC (6) | Error amplifier output | Connects to FB via compensation network (e.g., RC + capacitor); sets loop stability and transient response. |
| FB (7) | Feedback input | Senses output via resistor divider; nominal 1000mV reference; high-impedance (≤50nA bias) for precision regulation. |
| RT (8) | Oscillator frequency set | Resistor to GND sets fSW: 35.7kΩ = 1MHz; tolerance affects frequency accuracy (±10% over temp). |
| PGND (17) | Power ground return | Exposed pad - mandatory solder connection to PCB ground plane; primary thermal and current return path. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous architecture | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity in space-constrained automotive modules. |
| Seamless buck/boost/pass-through transition | No output glitches or control-loop instability when VIN crosses VOUT - essential for battery-powered systems with decaying input voltage. |
| Ultralow 3µA shutdown current | Enables true "off" state in safety-critical applications (e.g., ADAS camera ECU) without draining backup battery during vehicle sleep mode. |
| Integrated VCC LDO with 4.45V regulation | Removes need for external bias supply; supports gate drive for all internal switches across full 2.7–40V input range. |
| AEC-Q100 qualified (Grade I) | Rated for –40°C to +125°C junction temperature; validated for automotive powertrain, body electronics, and infotainment systems. |
| Reverse inductor current limit (–1.5A) | Prevents destructive reverse current flow during startup or fault conditions in bidirectional energy transfer applications. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/48V Power Routers |
|---|---|
Use Scenario: Maintains stable 5V/3.3V rail during engine cranking when battery voltage dips to 3.6V–6V. IC Role / Device Role / Timing Role: Buck-boost controller regulating output despite wide input swing; handles 2A peak load during ECU wake-up. Use Value: Prevents microcontroller brownout and ensures CAN bus continuity without external supervision circuitry. | Use Scenario: Powers PoE+ switches and PLC I/O modules from fluctuating 24V factory rails with ±20% tolerance. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting unregulated 24V to clean 12V/5V; operates continuously at 85°C ambient. Use Value: Eliminates need for upstream pre-regulator; 95% efficiency reduces heatsink size in dense rack-mounted equipment. |
| FireWire® Power Delivery | Backup Battery Management Systems |
Use Scenario: Supplies regulated 5V/12V from IEEE 1394 FireWire cable (28–40V nominal, poor regulation). IC Role / Device Role / Timing Role: Input-tolerant buck-boost converter accepting wide-range FireWire source; synchronizes to system clock via PWM/SYNC pin. Use Value: Enables direct FireWire-powered instrumentation without external AC/DC adapter or linear post-regulator. | Use Scenario: Maintains real-time clock and SRAM during main power failure using supercapacitor or Li-ion backup cell (2.7–4.5V). IC Role / Device Role / Timing Role: Bidirectional regulator charging backup cell from main rail and discharging to maintain VOUT when main fails. Use Value: 30µA Burst Mode IQ extends backup runtime by >3× vs conventional controllers; reverse current limit prevents cell over-discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20406AATG+ | 36V max input, 3.5A output, integrated FETs, but only 2.5–16V output range; no Burst Mode; 25µA shutdown current. | Not suitable for 24V→32V boost or 40V input automotive transients; lacks AEC-Q100 qualification. | Select when higher output current (3.5A) is needed at ≤16V output and AEC-Q100 is not required. |
| TPS63020DSJR | 18V max input, 2.5A output, 3.3–12V output range, 3.5µA shutdown, but no programmable frequency or external sync. | Cannot support 24V/40V industrial or automotive inputs; limited to consumer/portable applications. | Select for cost-sensitive portable designs requiring <18V input and no external clock sync. |
Compared with MAX20406AATG+ and TPS63020DSJR, the LTC3115IDHD-1#PBF uniquely supports 40V input, 40V output, AEC-Q100 Grade I qualification, and external clock synchronization - making it the only option for robust 24V/40V automotive and industrial buck-boost regulation with design flexibility.
Availability
LTC3115IDHD-1#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial 24V routers, FireWire® power delivery, and backup battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3115IDHD-1#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3115-1 product line was designed specifically for high-voltage, wide-input-range buck-boost regulation in harsh environments - targeting automotive start-stop, industrial power routing, and legacy interface power (e.g., FireWire) where input voltage unpredictability demands robustness and seamless mode transitions.
FAQ
What is the maximum input voltage rating for the LTC3115IDHD-1#PBF?
The LTC3115IDHD-1#PBF has an absolute maximum input voltage rating of 45V on PVIN and VIN pins, with continuous operation specified from 2.7V to 40V. Exceeding 40V during normal operation risks violating the guaranteed electrical characteristics, though transient 45V spikes are tolerated per Absolute Maximum Ratings. Always use appropriate input filtering and clamping for automotive load-dump scenarios.
Does the LTC3115IDHD-1#PBF support synchronization to an external clock?
Yes, the LTC3115IDHD-1#PBF 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 cycle-by-cycle alignment. The applied clock pulse width must be ≥100ns, and voltage must remain within 0.5V–1.5V logic thresholds to ensure reliable locking.
How does the RUN pin function in the LTC3115IDHD-1#PBF?
The RUN pin on the LTC3115IDHD-1#PBF serves dual functions: enabling/disabling the IC and programming custom input undervoltage lockout (UVLO). It sources 0.5µA hysteresis current when enabled, allowing precise UVLO thresholds (e.g., 2.7V) using a resistor divider from PVIN. The IC enables when RUN exceeds 1.21V (typical), and the pin must never exceed VIN + 0.3V under any condition.
What thermal considerations apply to the LTC3115IDHD-1#PBF DFN package?
The LTC3115IDHD-1#PBF uses a 4mm × 5mm DFN package with θJA = 43°C/W. Its exposed PGND pad (Pin 17) must be soldered to a minimum 200mm² copper area connected to the PCB ground plane. Insufficient thermal pad connection increases junction temperature, potentially triggering overtemperature protection above 125°C and degrading lifetime. Thermal simulation is recommended for >1.5A continuous loads at 85°C ambient.
Can the LTC3115IDHD-1#PBF operate with output voltages higher than its input voltage?
Yes, the LTC3115IDHD-1#PBF operates in boost mode when VOUT > VIN, supporting output voltages up to 40V from inputs as low as 2.7V. In this configuration, it delivers up to 1A at 5V when VIN ≥ 3.6V, and maintains regulation with seamless transition from buck to boost as VIN crosses VOUT - a core capability enabled by its four-switch synchronous architecture and proprietary control algorithm.
LTC3115IDHD-1#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:
- 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#PBF FAQ
1.How can I place an order for LTC3115IDHD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IDHD-1#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 LTC3115IDHD-1#PBF reliable?
The price and inventory of LTC3115IDHD-1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115IDHD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IDHD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IDHD-1#PBF?
LTC3115IDHD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IDHD-1#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 LTC3115IDHD-1#PBF?
For technical support, including LTC3115IDHD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IDHD-1#PBF requirements.
6.How does Aetrix verify that LTC3115IDHD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IDHD-1#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 LTC3115IDHD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115IDHD-1#PBF?
All LTC3115IDHD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IDHD-1#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 LTC3115IDHD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3115IDHD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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