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Analog Devices Inc. LTC3115HFE-1#TRPBF
- Part No.:
- LTC3115HFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115HFE-1#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,963
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Product details
Overview
LTC3115HFE-1#TRPBF from Analog Devices is a high-voltage monolithic synchronous buck-boost DC/DC converter supporting 2.7V–40V input and output voltage ranges, delivering up to 2A in step-down mode (VIN ≥ 6V), and featuring programmable 100kHz–2MHz switching frequency with external clock synchronization capability. It is AEC-Q100 qualified for automotive power systems and operates reliably across –40°C to +150°C junction temperature.
For engineers reviewing the LTC3115HFE-1#TRPBF datasheet, LTC3115HFE-1#TRPBF pinout, LTC3115HFE-1#TRPBF application, or LTC3115HFE-1#TRPBF equivalent, key selection criteria include wide VIN/VOUT compatibility, thermal robustness for under-hood use, Burst Mode® quiescent current (50µA typ), internal soft-start, and seamless buck/boost/buck-boost mode transitions without output disturbance.
Technical Context
The LTC3115HFE-1#TRPBF implements a four-switch synchronous buck-boost topology with integrated N-channel DMOS power switches (150mΩ each), proprietary low-noise PWM control algorithm, and voltage-mode regulation. Its architecture enables continuous regulation when VIN < VOUT, VIN > VOUT, or VIN ≈ VOUT - eliminating discontinuous conduction mode artifacts and subharmonic oscillation.
It integrates dual bootstrapped gate drivers (BST1/BST2), internal 4.45V VCC LDO regulator (with 50mA current limit), programmable input UVLO (2.7V threshold, 100mV hysteresis), and overtemperature protection. The device supports both fixed-frequency PWM and ultralow-quiescent-current Burst Mode® operation, selected via the PWM/SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid battery (12V/24V), FireWire, unregulated industrial rails, and wide-range adapters 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 mode (VIN ≥ 6V) - sufficient for powering microcontrollers, sensors, and CAN transceivers in automotive ECUs. |
| Switching Frequency | 100kHz to 2MHz - adjustable via RT resistor; higher frequencies allow smaller inductors (e.g., 5.2µH at 2MHz) and reduced PCB footprint. |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on telematics or ADAS modules. |
| Junction Temp Range | –40°C to +150°C - meets AEC-Q100 Grade H requirements for under-hood automotive applications. |
| Efficiency | Up to 95% - achieved at mid-load with optimized layout; maintains >85% efficiency down to 10mA load in PWM mode. |
Pinout & Package
Package: 20-lead plastic TSSOP with exposed thermal pad (Pin 21 = PGND); thermally enhanced for 150°C operation (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 (PGND) | Power Ground | Primary return path for high-current switch nodes; must be soldered to large PCB ground plane for thermal and EMI performance. |
| PIN 2 (RUN) | Enable & UVLO Control | Logic-enable input with 1.21V threshold; sourcing 0.5µA hysteresis current enables precise input undervoltage lockout via resistor divider. |
| PIN 3 (SW2) | Boost-Side Power Switch | Connects to inductor and PVOUT; handles bidirectional current during boost and buck-boost modes; requires low-inductance routing. |
| PIN 4 (PVOUT) | Power Output Supply Rail | High-current output node; requires ≥10µF low-ESR ceramic capacitor placed adjacent to IC with short ground return. |
| PIN 5–6 (GND) | Signal Ground Reference | Analog reference for FB, VC, RT; must be isolated from PGND at IC pins but joined at single-point system ground. |
| PIN 7 (VC) | Error Amplifier Output | Compensation node for feedback loop stability; connects to FB via RC network to set crossover frequency and phase margin. |
| PIN 8 (FB) | Voltage Feedback Input | Senses output via resistive divider; nominal 1000mV reference enables accurate VOUT setting (e.g., 5V with 1MΩ/204kΩ divider). |
| PIN 9 (RT) | Oscillator Frequency Set | Connects to ground via resistor (e.g., 35.7kΩ → 1MHz); sets switching frequency and influences minimum on/off times. |
| PIN 12 (VCC) | Internal Logic Supply | Powered by internal LDO from VIN; must be tied directly to PVCC; bypassed with ≥4.7µF capacitor for noise immunity. |
| PIN 13 (VIN) | VCC Regulator Input | Supplies internal LDO; senses input for UVLO; bypassed with 0.1µF capacitor close to pin for transient response. |
| PIN 14 (PVCC) | VCC Regulator Output | Provides gate drive voltage for all power switches; must be short-traced to VCC; additional local bypass recommended if trace >2mm. |
| PIN 15 (BST2) | SW2 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW2; generates floating rail for high-side switch D during boost operation. |
| PIN 16 (BST1) | SW1 Gate Drive Bootstrap | Connects via 0.1µF capacitor to SW1; generates floating rail for high-side switch A during buck operation. |
| PIN 17 (PVIN) | Main Power Input | High-current input node; requires ≥4.7µF ceramic + optional 47–100µF bulk capacitor; routed with low-impedance path to PGND. |
| PIN 18 (SW1) | Buck-Side Power Switch | Connects to inductor and PGND; carries high di/dt current in buck and buck-boost modes; critical for EMI control. |
| PIN 19 (PWM/SYNC) | Mode Control & Clock Sync | High = PWM mode; Low = Burst Mode®; external 100ns+ clock edge synchronizes switching up to 2MHz. |
| PIN 20 (PGND) | Secondary Power Ground | Additional PGND connection; must be tied to same low-impedance ground plane as Pin 1 and exposed pad. |
| Exposed Pad (Pin 21) | Thermal & Power Ground | Electrically PGND; mandatory solder connection to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Enables true buck-boost operation without polarity reversal or external diodes; eliminates body-diode conduction losses. |
| Seamless mode transition | Proprietary control algorithm prevents output voltage glitch or inductor current discontinuity when crossing VIN = VOUT boundary. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood environments including engine control units, ADAS cameras, and infotainment power supplies. |
| Integrated VCC LDO regulator | Generates stable 4.45V supply from VIN (2.7V–40V); eliminates need for external bias rail while supporting gate drive and logic circuits. |
| Programmable input UVLO | Configurable 2.7V threshold with 100mV hysteresis ensures reliable startup/shutdown behavior across battery voltage sag and recovery cycles. |
| Internal soft-start | 9ms ramp time limits inrush current during power-up; prevents input voltage droop and protects downstream components. |
Applications
| Automotive Engine Control Unit (ECU) Power Supply | Industrial 24V Fieldbus Node Regulator |
|---|---|
Use Scenario: Powers MCU, CAN transceiver, and analog sensors in diesel/gasoline engine control modules where input voltage varies from 6V (cranking) to 40V (load dump). IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 5V/3.3V output despite wide input transients; provides clean, low-noise supply for timing-critical digital logic. Use Value: Eliminates need for separate buck + boost stages; withstands AEC-Q100 load dump (ISO 7637-2 Pulse 5a) without latch-up or output collapse. | Use Scenario: Supplies 12V/24V fieldbus interface (e.g., Profibus, Modbus) in factory automation PLC I/O modules powered from unregulated 24V DC rails. IC Role / Device Role / Timing Role: Wide-input DC/DC converter generating regulated bus voltage; supports hot-swap and brown-out resilience in distributed control systems. Use Value: Maintains operation during 24V rail dips to 9V; delivers 2A peak current for solenoid drivers without derating at 70°C ambient. |
| FireWire (IEEE 1394) Power Regulator | Multi-Source Battery Backup System |
Use Scenario: Regulates FireWire cable power (typically 8–40V) to stable 5V/1.2A for connected peripherals in laptops, audio interfaces, and test equipment. IC Role / Device Role / Timing Role: Isolated buck-boost regulator handling highly variable input; rejects high-frequency noise from data lines via low-noise PWM mode. Use Value: Achieves <50mVpp output ripple in PWM mode at 1MHz; meets FireWire Class A EMC requirements without added filtering. | Use Scenario: Manages dual input sources (Li-ion battery + USB-C PD) in portable medical monitors, providing uninterrupted 3.3V/5V output during source switchover. IC Role / Device Role / Timing Role: Bidirectional input-aware regulator selecting optimal source; uses RUN pin to coordinate enable/disable sequencing between sources. Use Value: Enables zero-downtime transition between battery and adapter; Burst Mode® draws only 50µA from battery during standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IFE-1#TRPBF | Same silicon, rated for –40°C to +125°C junction temperature; lower max operating temp than H-grade. | Suitable for cabin-mounted automotive modules or industrial controls not exposed to under-hood temperatures. | Select when thermal budget allows ≤125°C junction; offers identical electrical specs and pinout at lower cost. |
| MP2918GL-Z | 3.5V–36V input, 2A max, 500kHz–2.2MHz sync range; no integrated VCC LDO - requires external bias. | Lacks AEC-Q100 qualification and 40V absolute max rating; limited to non-automotive 24V systems. | Consider for cost-sensitive industrial applications where 40V rating and automotive qualification are unnecessary. |
Compared with LTC3115IFE-1#TRPBF and MP2918GL-Z, the LTC3115HFE-1#TRPBF uniquely combines 150°C operation, integrated VCC LDO, 40V absolute maximum rating, and AEC-Q100 qualification - making it the only choice for high-reliability under-hood automotive power conversion.
Availability
LTC3115HFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24V fieldbus nodes, FireWire-powered peripherals, and multi-source battery backup systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3115HFE-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3115 family is designed specifically for high-voltage, wide-input-range DC/DC conversion in harsh environments - emphasizing reliability, thermal resilience, and seamless mode transitions for automotive and industrial power systems.
FAQ
What is the maximum junction temperature specification for the LTC3115HFE-1#TRPBF?
The LTC3115HFE-1#TRPBF is specified for continuous operation up to +150°C junction temperature, with guaranteed electrical performance across –40°C to +150°C. This Grade H rating satisfies AEC-Q100 requirements for under-hood automotive applications and enables use in high-ambient industrial enclosures without derating below 125°C.
Does the LTC3115HFE-1#TRPBF require external bootstrap capacitors?
Yes, the LTC3115HFE-1#TRPBF requires two 0.1µF ceramic capacitors: one between BST1 and SW1, and another between BST2 and SW2. These capacitors generate the floating gate drive voltages needed for the high-side N-channel MOSFETs in buck and boost configurations, and must be placed within 2mm of their respective pins.
Can the LTC3115HFE-1#TRPBF operate with input voltage below 2.7V?
No, the LTC3115HFE-1#TRPBF has a minimum specified input voltage of 2.7V per its absolute operating range. Operation below this level is not guaranteed and may result in UVLO activation, loss of regulation, or undefined behavior. The internal VCC LDO also requires ≥2.7V on VIN to maintain proper gate drive and control circuit functionality.
How is output voltage programmed on the LTC3115HFE-1#TRPBF?
The output voltage of the LTC3115HFE-1#TRPBF is set using a resistive divider from PVOUT to GND, connected to the FB pin. With a nominal 1000mV feedback reference, VOUT = 1000mV × (1 + R1/R2). For example, a 1MΩ top resistor and 204kΩ bottom resistor yields 5.9V output. Layout must minimize noise coupling from SW1/SW2 traces into the FB node.
Is the LTC3115HFE-1#TRPBF pin-compatible with other variants in the LTC3115-1 family?
Yes, the LTC3115HFE-1#TRPBF shares identical pinout, package dimensions, and electrical interface with all FE-package variants (e.g., LTC3115EFE-1#TRPBF, LTC3115IFE-1#TRPBF, LTC3115MPFE-1#TRPBF). All 20-lead TSSOP versions use the same footprint, thermal pad, and signal assignments - enabling drop-in replacement based on temperature grade requirements.
LTC3115HFE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3115HFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115HFE-1#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 LTC3115HFE-1#TRPBF reliable?
The price and inventory of LTC3115HFE-1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115HFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115HFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115HFE-1#TRPBF?
LTC3115HFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115HFE-1#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 LTC3115HFE-1#TRPBF?
For technical support, including LTC3115HFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115HFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3115HFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115HFE-1#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 LTC3115HFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115HFE-1#TRPBF?
All LTC3115HFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115HFE-1#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 LTC3115HFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115HFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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