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Analog Devices Inc. LTC3115MPFE-1#TRPBF
- Part No.:
- LTC3115MPFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3115MPFE-1#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,819
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Product details
Overview
LTC3115MPFE-1#TRPBF from Analog Devices is a high-voltage monolithic synchronous buck-boost DC/DC converter with 2.7V to 40V input and output voltage ranges, 2A step-down output current capability (VIN ≥ 6V), programmable 100kHz–2MHz switching frequency, and AEC-Q100 qualification for automotive power systems.
For engineers reviewing the LTC3115MPFE-1#TRPBF datasheet, LTC3115MPFE-1#TRPBF pinout, LTC3115MPFE-1#TRPBF application, or LTC3115MPFE-1#TRPBF equivalent, key selection considerations include its –55°C to 150°C operating junction temperature range, 20-lead TSSOP thermally enhanced package, Burst Mode® operation with 50µA no-load quiescent current, and seamless buck/boost/buck-boost mode transitions.
Technical Context
The LTC3115MPFE-1#TRPBF implements a four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each), proprietary low-noise voltage-mode control, and automatic mode transition logic that maintains regulation when VIN is above, below, or equal to VOUT. Its oscillator supports RT-resistor programming and external clock synchronization up to 2MHz.
It integrates an internal 4.45V VCC regulator powered from VIN, programmable input undervoltage lockout (2.725V typical threshold), internal soft-start (9ms duration), output disconnect in shutdown, and short-circuit protection. The device uses separate power ground (PGND) and signal ground (GND) pins with exposed-pad thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports wide-input sources including 24V/28V industrial rails, lead-acid batteries, and unregulated adapters. |
| Output Voltage Range | 2.7V to 40V - enables fixed or adjustable regulation across automotive, telecom, and FireWire applications. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers high power density without external current-sense resistors. |
| Switching Frequency | 100kHz to 2MHz - selectable via RT resistor or external clock; enables miniaturization with small inductors (e.g., 5.2µH at 2MHz). |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on automotive and portable systems. |
| Operating Temp Range | –55°C to 150°C junction - qualified per AEC-Q100 Grade MP for under-hood and harsh-environment deployment. |
| Efficiency | Up to 95% - achieved via low-RDS(on) internal switches and optimized gate drive architecture. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE), 0.65mm pitch, exposed PGND pad (Pin 21) requiring solder connection to PCB ground plane for thermal performance (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 connected to exposed pad and low-impedance PCB ground plane. |
| PIN 2 / RUN | Enable & UVLO Control | Logic-enable input with 1.21V threshold; supports resistor-divider–based custom input undervoltage lockout. |
| PIN 3 / SW2 | Power Switch Node | Connects to one end of buck-boost inductor; drives internal switch D (PVOUT-side N-FET). |
| PIN 4 / PVOUT | Power Output | High-current output rail; requires ≥10µF low-ESR capacitor placed adjacent to IC with short ground return. |
| PIN 5 / GND | Signal Ground | Reference for FB, VC, RT, and control circuitry; isolated from PGND to minimize noise coupling. |
| PIN 6 / GND | Signal Ground | Duplicate GND pin for robust analog reference routing and layout decoupling. |
| PIN 7 / VC | Error Amplifier Output | Compensation node for feedback loop stability; connects to FB via RC network. |
| PIN 8 / FB | Feedback Input | Senses output voltage via resistor divider; nominal 1000mV reference enables precise VOUT programming. |
| PIN 9 / RT | Oscillator Programming | Resistor-to-ground sets switching frequency (e.g., 35.7kΩ → 1MHz); supports sync via PWM/SYNC pin. |
| PIN 10 / PGND | Power Ground | Secondary PGND connection reinforcing thermal and current return path integrity. |
| PIN 11 / PGND | Power Ground | Third PGND terminal supporting high-frequency current return from internal gate drivers. |
| PIN 12 / PWM/SYNC | Mode Control & Sync | High = fixed-frequency PWM; low = Burst Mode®; external clock input synchronizes switching up to 2MHz. |
| PIN 13 / SW1 | Power Switch Node | Connects to other end of buck-boost inductor; drives internal switch A (PVIN-side N-FET). |
| PIN 14 / PVIN | Power Input | Main high-voltage input rail; requires ≥4.7µF bypass capacitor with direct via to ground plane. |
| PIN 15 / BST2 | Flying Capacitor | Connects 0.1µF capacitor to SW2; generates gate drive voltage for switch D. |
| PIN 16 / BST1 | Flying Capacitor | Connects 0.1µF capacitor to SW1; generates gate drive voltage for switch A. |
| PIN 17 / PVCC | VCC Regulator Output | Internal LDO output (4.45V); powers gate drivers and must be tied directly to VCC pin. |
| PIN 18 / VIN | VCC Regulator Input | Input to internal VCC LDO; senses VIN for UVLO and supplies bias to control circuitry. |
| PIN 19 / VCC | VCC Regulator Input | Must be shorted to PVCC; powers internal logic and requires ≥4.7µF local bypass. |
| PIN 20 / PGND | Power Ground | Fourth PGND terminal enhancing thermal dissipation and reducing ground bounce. |
| PIN 21 / PGND (Exposed Pad) | Thermal & Power Ground | Electrically and thermally critical; must be soldered to PCB ground plane for rated θJC = 10°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Eliminates need for external MOSFETs or diodes; enables bidirectional voltage conversion with >95% peak efficiency. |
| Seamless mode transition | Zero-output-transient switching between buck, boost, and buck-boost modes-no control-loop reconfiguration required. |
| Programmable Burst Mode® | Reduces no-load input current to 50µA while maintaining regulated output-critical for always-on automotive modules. |
| AEC-Q100 MP-grade qualification | Validated for –55°C to 150°C operation with full parametric testing-meets reliability requirements for engine control units. |
| Integrated VCC LDO with 4.45V output | Self-biasing architecture eliminates external bias supply; supports gate drive and internal logic across full input range. |
| Internal soft-start (9ms) | Prevents inrush current during power-up; eliminates need for external timing components or sequencing circuits. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Rail Regulation |
|---|---|
Use Scenario: Powering display controllers and audio processors from variable 9V–16V automotive battery with cold-crank tolerance down to 3.6V. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/2A output independent of battery voltage fluctuations. Use Value: Maintains system operation during cranking (VIN = 3.6V) and stop-start cycles without brownout or reset. | Use Scenario: Converting unregulated 24V industrial bus to 12V for PLC I/O modules subject to load transients and EMI. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC stage with programmable 750kHz switching to minimize conducted emissions. Use Value: Delivers 2A continuous output with <50mVpp ripple in PWM mode and 3µA shutdown current for energy-sensitive designs. |
| FireWire® (IEEE 1394) Regulator | Multi-Source Backup Power System |
Use Scenario: Regulating 30V FireWire cable power to 5V/1A for peripheral devices with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise buck-boost converter operating in synchronized PWM mode to avoid interference with high-speed data lines. Use Value: Achieves <10mVpp output ripple at 1MHz sync frequency-meets FireWire EMC Class B requirements. | Use Scenario: Seamless switchover between USB-C (5V), PoE (48V), and Li-ion (3.0–4.2V) inputs to maintain 3.3V/1A system rail. IC Role / Device Role / Timing Role: Single-chip wide-VIN solution eliminating OR-ing FETs and discrete supervisors. Use Value: Enables automatic input selection with no external control logic-reduces BOM count by 7 components. |
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, –40°C to 125°C temp grade; lower max junction temperature and reduced thermal derating margin. | Suitable for cabin electronics but not under-hood; lacks extended low-temp capability for cold-climate deployments. | Select LTC3115MPFE-1#TRPBF when operating below –40°C or above 125°C is required. |
| MAX20406AATJ+ | 36V max input, 3.5A output, integrated FETs, but only 2.5V min input; no AEC-Q100 qualification. | Higher current but narrower VIN range; limited to non-automotive industrial use due to missing automotive reliability validation. | Choose MAX20406AATJ+ only if 3.5A output and smaller 16-pin TQFN package outweigh automotive qualification needs. |
Compared with LTC3115IFE-1#TRPBF, the LTC3115MPFE-1#TRPBF provides guaranteed operation down to –55°C and up to 150°C, enabling under-hood deployment where thermal stress exceeds commercial-grade limits; versus MAX20406AATJ+, it trades 1.5A higher output for broader VIN range, automotive qualification, and proven field reliability in safety-critical systems.
Availability
LTC3115MPFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V regulation, FireWire® power delivery, and multi-source backup power systems requiring stable component supply across extended temperature extremes.
Supply support for LTC3115MPFE-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, automotive, and communications markets.
The LTC3115MPFE-1#TRPBF belongs to the LTC® high-voltage power management product line, engineered specifically for robust, wide-input-range DC/DC conversion in automotive and harsh-environment industrial applications.
FAQ
What is the maximum supported switching frequency for LTC3115MPFE-1#TRPBF?
The LTC3115MPFE-1#TRPBF supports switching frequencies from 100kHz to 2MHz. This range is set either by an external resistor on the RT pin or by synchronizing to an external clock applied to the PWM/SYNC pin. At 2MHz, the device enables ultra-compact designs using inductors as small as 5.2µH while maintaining >90% efficiency at moderate loads.
Does LTC3115MPFE-1#TRPBF require external MOSFETs or diodes?
No, the LTC3115MPFE-1#TRPBF integrates four 150mΩ N-channel DMOS power switches, internal gate drivers, and bootstrap capacitors (BST1/BST2), eliminating the need for external MOSFETs, diodes, or gate-drive components. Only two 0.1µF flying capacitors and standard passive components (inductor, input/output capacitors, feedback resistors) are required for full operation.
How does LTC3115MPFE-1#TRPBF handle input voltages below the output voltage?
The LTC3115MPFE-1#TRPBF automatically operates in boost mode when VIN falls below VOUT, using its four-switch topology to maintain regulation without external intervention. Its proprietary control algorithm ensures seamless, transient-free transitions between buck, boost, and buck-boost modes-verified in load-step testing with <100mV output deviation during mode crossing.
What is the purpose of the exposed pad on the LTC3115MPFE-1#TRPBF TSSOP package?
The exposed pad (Pin 21) on the LTC3115MPFE-1#TRPBF is electrically connected to PGND and serves as the primary thermal conduction path. It must be soldered to a large PCB copper area tied to the ground plane to achieve the specified θJA = 38°C/W and prevent junction temperature exceedance under 2A load conditions.
Can LTC3115MPFE-1#TRPBF be synchronized to an external clock source?
Yes, the LTC3115MPFE-1#TRPBF can be synchronized to an external clock applied to the PWM/SYNC pin. When driven with a clean square wave (≥100ns pulse width, ≤5.5V amplitude), the device locks its internal oscillator to the external frequency across the full 100kHz–2MHz range, enabling EMI reduction through frequency dithering or alignment with system clocks.
LTC3115MPFE-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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3115MPFE-1#TRPBF FAQ
1.How can I place an order for LTC3115MPFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115MPFE-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 LTC3115MPFE-1#TRPBF reliable?
The price and inventory of LTC3115MPFE-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 LTC3115MPFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3115MPFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115MPFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115MPFE-1#TRPBF?
LTC3115MPFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115MPFE-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 LTC3115MPFE-1#TRPBF?
For technical support, including LTC3115MPFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115MPFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3115MPFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3115MPFE-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 LTC3115MPFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3115MPFE-1#TRPBF?
All LTC3115MPFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115MPFE-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 LTC3115MPFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3115MPFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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