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Analog Devices Inc. LTC3115HFE-1#PBF
- Part No.:
- LTC3115HFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115HFE-1#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
LTC3115HFE-1#PBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter with 2.7V–40V input and output voltage ranges, programmable 100kHz–2MHz switching frequency, and AEC-Q100 qualification for automotive power systems requiring seamless mode transitions and high efficiency up to 95%.
For engineers reviewing the LTC3115HFE-1#PBF datasheet, LTC3115HFE-1#PBF pinout, LTC3115HFE-1#PBF application, or LTC3115HFE-1#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 20-lead TSSOP package with exposed PGND pad, Burst Mode® operation delivering 50µA no-load quiescent current, and support for external clock synchronization up to 2MHz.
Technical Context
The LTC3115HFE-1#PBF implements a proprietary four-switch buck-boost topology with internal N-channel DMOS power switches (150mΩ each), enabling regulation when VIN is above, below, or equal to VOUT without discontinuities. Its voltage-mode control loop uses a 1000mV feedback reference and supports programmable soft-start (9ms typical) and input undervoltage lockout with 100mV hysteresis.
Operation includes selectable PWM or Burst Mode via the PWM/SYNC pin, with internal oscillator frequency set by an RT resistor (e.g., 35.7kΩ yields 1MHz). The device integrates a 4.45V VCC regulator powered from VIN, with 50mA current limit and 50mV dropout at 5mA load, and features reverse inductor current limiting (–1.5A) and overtemperature protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports wide-input sources including 24V industrial rails, 28V avionics, and unregulated FireWire or battery inputs. |
| Output Voltage Range | 2.7V to 40V - enables single-converter solutions for variable-output systems like telecom bias supplies or multi-rail embedded controllers. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full rated current without derating when input exceeds output, critical for automotive cold-crank scenarios. |
| Switching Frequency | 100kHz to 2MHz - allows trade-off between inductor size (e.g., 5.2µH at 2MHz) and efficiency (peak 95% at 1MHz, 5V out). |
| Quiescent Current | 50µA in Burst Mode, 3µA in shutdown - extends battery life in always-on telematics or ECU sleep modes. |
| Junction Temp Range | –40°C to +150°C - meets AEC-Q100 Grade H requirements for under-hood automotive applications without thermal derating. |
| Feedback Reference | 1000mV ±23mV - enables precise output setting with standard resistor dividers; line regulation <0.1% ensures stability across input transients. |
Pinout & Package
The LTC3115HFE-1#PBF is housed in a thermally enhanced 20-lead plastic TSSOP package (FE) with an exposed PGND pad (Pin 21) that must be soldered to the PCB ground plane for rated thermal performance (θJA = 38°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 / PGND | Power Ground | Primary return path for high-current switch nodes SW1/SW2; must be low-impedance connection to PCB ground plane. |
| PIN 2 / RUN | Enable & UVLO Control | Logic-enable input with 1.21V threshold; sourcing 0.5µA hysteresis current enables accurate resistor-divider-based input UVLO programming. |
| PIN 3 / SW2 | Buck-Boost Switch Node | Connects to one end of inductor; drives internal N-channel switch C/D; requires 0.1µF BST2 capacitor to Pin 15 for gate drive. |
| PIN 4 / PVOUT | Power Output | High-current output rail; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with short ground return. |
| PIN 5–6 / GND | Signal Ground | Analog ground reference for FB, VC, RT; must be isolated from PGND at single-point star ground to minimize noise coupling. |
| PIN 7 / VC | Error Amplifier Output | Compensation node for feedback loop; connects to FB via RC network to stabilize transient response and phase margin. |
| PIN 8 / FB | Feedback Input | 1000mV reference input; senses output via resistive divider; high-impedance (≤50nA) node sensitive to switch-node coupling. |
| PIN 9 / RT | Oscillator Programming | Sets switching frequency via resistor to ground (e.g., 35.7kΩ = 1MHz); tolerance directly impacts frequency accuracy. |
| PIN 12 / VCC | Internal Logic Supply | Low-voltage rail (4.45V) for control circuitry; must be tied directly to PVCC with ≥4.7µF bypass capacitor. |
| PIN 13 / VIN | VCC Regulator Input | Input to internal LDO generating VCC; requires 0.1µF local bypass; also serves as sense point for VIN UVLO divider. |
| PIN 14 / PVCC | VCC Regulator Output | Output of internal LDO; powers gate drivers and logic; must be short-traced to VCC and bypassed externally. |
| PIN 15 / BST2 | SW2 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW2; generates floating gate drive voltage for high-side switch D. |
| PIN 16 / BST1 | SW1 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW1; generates floating gate drive voltage for high-side switch A. |
| PIN 17 / PVIN | Main Power Input | High-current input rail; requires ≥4.7µF ceramic bypass and optional 47–100µF bulk capacitor for long-line or high-ESR sources. |
| PIN 18 / SW1 | Buck-Boost Switch Node | Connects to other end of inductor; drives internal N-channel switch A/B; requires 0.1µF BST1 capacitor to Pin 16. |
| PIN 19 / PWM/SYNC | Mode Control & Sync Input | High = fixed-frequency PWM; low = Burst Mode; external clock input (100kHz–2MHz) synchronizes switching with system timing. |
| PIN 20 / PGND | Power Ground | Secondary PGND connection; ties to exposed pad and main PGND net for thermal and EMI performance. |
| PIN 21 / PGND (Exposed Pad) | Thermal & Power Ground | Primary thermal path; must be soldered to ≥2cm² copper area on inner layer with ≥6 thermal vias to internal ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transitions | Proprietary switching algorithm eliminates output transients and subharmonics when VIN crosses VOUT, enabling stable operation in automotive start-stop cycles. |
| AEC-Q100 Qualified (Grade H) | Guaranteed operation from –40°C to +150°C junction temperature with production test coverage for automotive reliability requirements. |
| Ultralow Noise PWM Mode | Fixed-frequency voltage-mode control with minimized EMI emissions; achieves <50mVpp output ripple at 5V/1A in PWM mode (24V input). |
| Programmable Input UVLO | Configurable threshold (2.4V–2.8V) and hysteresis (100mV) via RUN pin resistor divider, supporting custom brown-out behavior for battery-powered systems. |
| Integrated VCC Regulator | 4.45V LDO with 50mA current limit powers gate drivers and logic; eliminates need for external bias supply while maintaining regulation down to 2.7V VIN. |
| Reverse Current Blocking | Active blocking prevents backfeed from PVOUT to PVIN during shutdown or fault conditions, protecting upstream sources in redundant power architectures. |
Applications
| Automotive Start-Stop Systems | Industrial 24V/28V Power Supplies |
|---|---|
Use Scenario: Maintaining stable 5V/12V rail during engine cranking where battery voltage dips to 3.6V and recovers to 14.5V. IC Role / Device Role / Timing Role: Primary buck-boost regulator managing bidirectional voltage conversion with zero-output-transient mode transitions. Use Value: Delivers uninterrupted power to infotainment and ADAS modules without requiring backup capacitors or secondary regulators. | Use Scenario: Converting unregulated 24V industrial bus (18–32V range) to stable 5V/3.3V for PLC I/O and sensor interfaces. IC Role / Device Role / Timing Role: Wide-input DC/DC front-end providing regulated outputs immune to line surges and brownouts. Use Value: Eliminates need for pre-regulators or discrete UVLO circuits, reducing BOM count and board space in DIN-rail mounted equipment. |
| Telecom Bias Supplies | FireWire Regulators |
Use Scenario: Generating ±12V or 3.3V/5V from 48V telecom rectified input subject to hot-swap transients and load dumps. IC Role / Device Role / Timing Role: High-efficiency, high-voltage buck-boost converter with robust overvoltage and short-circuit protection. Use Value: Achieves >90% efficiency at 1A load while surviving 60V input transients per GR-1089 compliance requirements. | Use Scenario: Regulating FireWire (IEEE 1394) 28–40V bus to 5V/1.2A for peripheral devices with strict standby current limits. IC Role / Device Role / Timing Role: Low-quiescent-current buck-boost controller meeting IEEE 1394a power budget constraints. Use Value: 50µA Burst Mode current enables USB-style suspend/resume functionality without auxiliary power management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IFE-1#PBF | Same architecture and pinout, but rated for –40°C to +125°C junction temperature; lower thermal capability (θJA = 43°C/W vs 38°C/W). | Not qualified for under-hood automotive use; suitable for industrial or telecom applications with ambient <85°C. | Select when AEC-Q100 Grade H is unnecessary and cost optimization is prioritized over extended temperature margin. |
| MAX20404ATPA/VY+ | 36V, 2A buck-boost with integrated FETs and I²C interface; smaller 20-pin TQFN (4mm × 4mm); lacks AEC-Q100 qualification and external sync capability. | Designed for space-constrained consumer electronics; no direct pin compatibility or identical feature set. | Choose for compact designs requiring digital configuration and telemetry, not for automotive or high-reliability industrial deployments. |
Compared with LTC3115IFE-1#PBF and MAX20404ATPA/VY+, the LTC3115HFE-1#PBF uniquely combines AEC-Q100 Grade H qualification, 2MHz external synchronization, and guaranteed 150°C operation-making it the only option for thermally demanding automotive power domains where reliability trumps footprint savings.
Availability
LTC3115HFE-1#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial 24V/28V power supplies, telecom bias generation, and FireWire regulator applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3115HFE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3115 family is designed for high-voltage, wide-input-range DC/DC conversion in harsh environments-specifically targeting automotive, industrial, and telecom applications where input voltage instability and thermal stress demand robust, integrated buck-boost solutions.
FAQ
What is the maximum junction temperature specification for the LTC3115HFE-1#PBF?
The LTC3115HFE-1#PBF is specified for continuous operation from –40°C to +150°C junction temperature, with guaranteed electrical performance across this full range per AEC-Q100 Grade H requirements. This rating enables deployment in under-hood automotive locations where ambient temperatures exceed 105°C and thermal derating is unacceptable. The device incorporates overtemperature protection that activates above TJMAX to prevent permanent damage during momentary overload events.
Does the LTC3115HFE-1#PBF support external clock synchronization, and what is the valid frequency range?
Yes, the LTC3115HFE-1#PBF supports external clock synchronization via the PWM/SYNC pin, accepting input frequencies from 100kHz to 2MHz. When an external clock is applied, the device operates in fixed-frequency PWM mode synchronized to that signal, eliminating beat frequencies and simplifying EMI filtering in systems with multiple switching regulators. The minimum pulse width (positive or negative) must be ≥100ns, and the maximum input voltage is 5.5V.
How does the RUN pin function in the LTC3115HFE-1#PBF, and can it be used to set custom undervoltage lockout thresholds?
The RUN pin on the LTC3115HFE-1#PBF serves dual functions: enabling/disabling the IC and programming custom input UVLO thresholds. With a nominal 1.21V enable threshold and 100mV hysteresis, it accepts a resistor divider from PVIN to set precise turn-on/off voltages (e.g., 2.7V UVLO). Once enabled, the pin sources 0.5µA to provide hysteresis; tying RUN directly to PVIN provides continuous operation. It must never be forced >0.3V above VIN.
What is the purpose of the BST1 and BST2 pins on the LTC3115HFE-1#PBF, and what external components are required?
BST1 and BST2 are bootstrap capacitor connections for the high-side gate drivers of internal switches A and D, respectively. Each requires a 0.1µF ceramic capacitor placed between the BST pin and its corresponding switch node (BST1 to SW1, BST2 to SW2). These capacitors generate the floating gate drive voltage needed to fully enhance the N-channel high-side MOSFETs, ensuring low RDS(on) conduction and minimizing switching losses across the full input range.
Is the LTC3115HFE-1#PBF pin-compatible with other variants in the LTC3115-1 family, such as the DFN-packaged versions?
No, the LTC3115HFE-1#PBF is not pin-compatible with DFN-packaged variants (e.g., LTC3115EDHD-1#PBF) due to differing pin counts (20-pin TSSOP vs 16-pin DFN) and distinct pin assignments. While both share identical functional blocks and electrical specifications, the FE package relocates several pins-including PGND, RUN, and PWM/SYNC-to accommodate the larger lead count and thermal pad layout. Board redesign is required when migrating between FE and DHD packages.
LTC3115HFE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115HFE-1#PBF FAQ
1.How can I place an order for LTC3115HFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115HFE-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 LTC3115HFE-1#PBF reliable?
The price and inventory of LTC3115HFE-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 LTC3115HFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115HFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115HFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115HFE-1#PBF?
LTC3115HFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115HFE-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 LTC3115HFE-1#PBF?
For technical support, including LTC3115HFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115HFE-1#PBF requirements.
6.How does Aetrix verify that LTC3115HFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115HFE-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 LTC3115HFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115HFE-1#PBF?
All LTC3115HFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115HFE-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 LTC3115HFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3115HFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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