LTC3115-1EFE#TRPBF - 40V, 2A Sync Buck-Boost | Analog Devices
MPN: LTC3115-1EFE#TRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.39 | $7.39 |
| 10 | $6.65 | $66.50 |
| 100 | $5.91 | $591.00 |
| 500 | $5.17 | $2,585.00 |
| 1,000 | $4.43 | $4,430.00 |
LTC3115-1EFE#TRPBF Overview
A buck-boost converter is a type of DC-DC switching regulator that can step up or step down an input voltage to produce a regulated output voltage, regardless of whether the input is higher or lower than the output. This is achieved by combining buck (step-down) and boost (step-up) topologies in a single circuit, using four internal low-resistance N-channel DMOS switches. The LTC3115-1 is part of the broader family of switching regulators, which are essential building blocks in power management systems, converting unregulated power sources into stable, usable voltages for electronic circuits.
Key features of the LTC3115-1 include a proprietary low noise switching algorithm that optimizes efficiency across a wide input voltage range, a programmable switching frequency from 100kHz to 2MHz, and a low quiescent current of 50uA in Burst Mode operation. The device also offers a precision 0.8V reference, soft-start, and a power good output, simplifying system design and ensuring reliable startup and fault monitoring.
Technically, the LTC3115-1 uses a current-mode control architecture with a 1.2A peak inductor current limit, enabling stable operation with a wide range of external components. The four internal DMOS switches have low on-resistance, minimizing conduction losses and maximizing efficiency, which can exceed 95% in typical applications. The device also includes thermal shutdown and overcurrent protection, enhancing robustness in harsh environments.
Typical applications include automotive power systems, industrial control equipment, battery-powered devices, and point-of-load regulation where the input voltage may vary above or below the desired output. Its wide input range and high efficiency make it ideal for 12V and 24V industrial buses, as well as for powering sensors, microcontrollers, and communication interfaces.
When designing with the LTC3115-1, it is important to select the inductor and capacitors according to the datasheet guidelines to achieve the desired ripple and transient response. The exposed pad should be soldered to a large copper area for effective heat dissipation, and the switching node should be kept short to minimize EMI.
Drop-in alternatives for LTC3115-1EFE#TRPBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC3115EFE-1#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC3115EFE-2#TRPBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3115-1EFE#TRPBF Maximum Ratings & Electrical Characteristics
| Function | Buck-Boost |
| Output Configuration | Positive |
| Topology | Buck-Boost |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 2.7 V |
| Voltage - Input (Max) | 40 V |
| Voltage - Output (Min/Fixed) | 2.7 V |
| Voltage - Output (Max) | 40 V |
| Current - Output | 1A, 2A |
| Switching Frequency | 100kHz ~ 2MHz |
| Synchronous Rectifier | Yes |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount |
| Package / Case | 20-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| Supplier Device Package | 20-TSSOP-EP |
LTC3115-1EFE#TRPBF Pin Configuration
| Pin 1 | SW1 — Switch node connection for the buck converter |
| Pin 2 | PVIN1 — Power input for the buck converter |
| Pin 3 | PVIN2 — Power input for the boost converter |
| Pin 4 | SW2 — Switch node connection for the boost converter |
| Pin 5 | GND — Ground |
| Pin 6 | GND — Ground |
| Pin 7 | FB — Feedback input for output voltage regulation |
| Pin 8 | ITH — Error amplifier output for loop compensation |
| Pin 9 | SS — Soft-start programming pin |
| Pin 10 | RUN — Enable input (active high) |
| Pin 11 | PGOOD — Power good output (open-drain) |
| Pin 12 | SYNC/MODE — Synchronization and mode selection pin |
| Pin 13 | VIN — Input supply for internal circuitry |
| Pin 14 | VOUT — Output voltage sense |
| Pin 15 | VOUT — Output voltage sense |
| Pin 16 | VOUT — Output voltage sense |
| Pin 17 | GND — Ground |
| Pin 18 | GND — Ground |
| Pin 19 | GND — Ground |
| Pin 20 | GND — Ground |
Typical Applications
LTC3115-1EFE#TRPBF is suitable for 6 applications: Automotive Power Systems, Industrial Control Equipment, Battery-Powered Devices, Point-of-Load Regulation, Networking and Communication, Medical Devices.
Automotive Power Systems
The LTC3115-1EFE#TRPBF is ideal for automotive power systems due to its wide 2.7V to 40V input range, which accommodates load dumps and cold-crank conditions. It provides a regulated output for ECUs, sensors, and infotainment systems, with high efficiency to minimize heat in the engine bay. The device's low quiescent current in Burst Mode helps reduce battery drain when the vehicle is off. Its robust operating temperature range of -40°C to 125°C ensures reliable operation in harsh environments. The integrated DMOS switches reduce external component count, saving PCB space in space-constrained automotive modules.
Recommended
Industrial Control Equipment
In industrial control systems, the LTC3115-1EFE#TRPBF provides a stable power rail from 24V or 12V buses, even when the bus voltage fluctuates. Its programmable switching frequency (100kHz to 2MHz) allows optimization for efficiency or component size, and the low noise algorithm minimizes EMI, which is critical in sensitive industrial environments. The device's high efficiency reduces thermal stress, enabling operation in sealed enclosures without active cooling. The power good output simplifies sequencing and fault monitoring in multi-rail systems. With its wide input range, it can also handle brownout conditions, ensuring continuous operation of PLCs and motor controllers.
Recommended
Battery-Powered Devices
The LTC3115-1EFE#TRPBF is well-suited for battery-powered devices such as portable instruments and wireless sensors, where the input voltage varies as the battery discharges. Its low quiescent current (50uA in Burst Mode) extends battery life, and the buck-boost topology ensures a regulated output even when the battery voltage drops below the desired output. The device's high efficiency maximizes runtime, and its small TSSOP package fits compact designs. The wide input range also supports multiple battery chemistries, including Li-Ion, alkaline, and lead-acid. The enable pin allows for power gating to further reduce standby power.
Recommended
Point-of-Load Regulation
The LTC3115-1EFE#TRPBF is an excellent choice for point-of-load (POL) regulation in systems where the input voltage can be above or below the required output. For example, it can generate a 5V rail from a 3.3V or 12V supply, providing design flexibility. Its fast transient response and programmable frequency allow it to meet the demands of digital loads such as FPGAs and microcontrollers. The device's integrated switches and small footprint reduce board space, and its high efficiency minimizes the need for heatsinking. The power good output can be used to enable downstream converters in a sequenced power-up scheme.
Recommended
Networking and Communication
In networking equipment, the LTC3115-1EFE#TRPBF can power communication interfaces and processors from a wide-ranging backplane supply. Its low noise switching algorithm reduces interference with sensitive RF and analog circuits, making it suitable for base stations and routers. The device's wide input range accommodates various power architectures, and its high efficiency reduces cooling requirements in dense racks. The programmable frequency allows synchronization to avoid beat frequencies with other converters. The power good output aids in system monitoring and fault detection, enhancing reliability in always-on infrastructure.
Recommended
Medical Devices
The LTC3115-1EFE#TRPBF is suitable for medical devices that require reliable power from batteries or adapters. Its wide input range and high efficiency ensure consistent operation, and its low noise characteristics are beneficial for sensitive analog front-ends in patient monitoring equipment. The device's small package and low external component count help miniaturize portable medical devices. The operating temperature range covers clinical environments, and the thermal shutdown protection enhances safety. The power good output can be used to trigger alarms in case of power failure, improving patient safety.
Recommended
Recommended Products Summary
Engineering reference data for LTC3115-1EFE#TRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3115EFE-1#PBF | LTC3115EDHD-1#TRPBF | LTC3115IDHD-1#PBF | LTC3115EFE-2#TRPBF | TPS63070RNMT |
|---|---|---|---|---|---|---|
| Package | 20-TSSOP-EP | 20-TSSOP-EP | 16-WFDFN | 16-WFDFN | 20-TSSOP-EP | VQFN-15 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Range | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2V to 16V |
| Output Current | 1A (buck), 2A (boost) | 1A (buck), 2A (boost) | 1A (buck), 2A (boost) | 1A (buck), 2A (boost) | 1A (buck), 2A (boost) | 2A (buck), 3A (boost) |
| Switching Frequency | 100kHz to 2MHz | 100kHz to 2MHz | 100kHz to 2MHz | 100kHz to 2MHz | 400kHz to 2MHz | 2.4MHz typical |
| Quiescent Current | 50uA (Burst Mode) | 50uA (Burst Mode) | 50uA (Burst Mode) | 50uA (Burst Mode) | 50uA (Burst Mode) | 30uA (light load) |
| Operating Temperature | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C |
| Synchronous Rectifier | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Wide input voltage range of 2.7V to 40V (vs TPS63070RNMT)
- Programmable switching frequency from 100kHz to 2MHz (vs LTC3115EFE-2#TRPBF)
- Low quiescent current of 50uA in Burst Mode (vs TPS63070RNMT)
Design Notes
For optimal performance, place the input and output capacitors as close as possible to the PVIN and VOUT pins. Use low-ESR ceramic capacitors (e.g., 10uF X5R) for input and output. The exposed pad (EP) must be soldered to a large copper area on the PCB to ensure proper heat dissipation. Keep the switching node (SW1, SW2) traces short and wide to minimize parasitic inductance and EMI.
The LTC3115-1EFE#TRPBF can dissipate significant power at high input-output differentials and high load currents. For example, at VIN=12V, VOUT=5V, and 1A load, power dissipation is approximately 7W. The 20-TSSOP-EP package has a thermal resistance (theta_JA) of about 40°C/W with proper PCB copper. Ensure adequate copper area and, if necessary, use thermal vias to keep the junction temperature below 125°C.
Do not exceed the absolute maximum ratings, especially the input voltage of 40V. Use a proper input capacitor to handle transient voltages. The feedback resistor divider should use 1% tolerance resistors to maintain output voltage accuracy. The soft-start capacitor (SS) controls inrush current; a typical value of 0.1uF is recommended. Ensure the inductor is rated for the peak current to avoid saturation.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified, but suitable for automotive applications per datasheet.
