LTC3115-2IDE#PBF - 40V, 2A Sync Buck-Boost DC/DC | Analog Devices
MPN: LTC3115-2IDE#PBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.52 | $8.52 |
| 10 | $7.68 | $76.80 |
| 100 | $6.84 | $684.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.76 | $5,760.00 |
Drop-in alternatives for LTC3115-2IDE#PBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LTC3115IFE-2#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115EFE-2#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115EFE-1#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115IFE-1#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115-2IDE#PBF Maximum Ratings & Electrical Characteristics
| Function | Buck-Boost |
| Output Type | Adjustable |
| Output Voltage Range | 2.7V to 18V |
| Input Voltage Range | 2.7V to 40V |
| Maximum Output Current | 2A |
| Switching Frequency | 300kHz to 2MHz |
| Synchronous Rectifier | Yes |
| Number of Outputs | 1 |
| Package | 20-TSSOP Exposed Pad |
| Operating Temperature Range | -40C to +125C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead Free | Yes |
| Reference Voltage | 0.8V |
| Soft Start | Yes |
| Power Good Output | Yes |
LTC3115-2IDE#PBF Pin Configuration
| Pin 1 | SW1 β Switch node connection for the buck-boost inductor |
| Pin 2 | PVIN1 β Power input supply for the buck stage |
| Pin 3 | PVIN2 β Power input supply for the boost stage |
| Pin 4 | VIN β Input supply for internal control circuitry |
| Pin 5 | RUN β Enable pin (active high) |
| Pin 6 | SS β Soft-start programming pin |
| Pin 7 | FREQ β Switching frequency programming pin |
| Pin 8 | MODE β Mode selection pin (burst or PWM) |
| Pin 9 | VFB β Feedback voltage sense pin |
| Pin 10 | ITH β Error amplifier output for loop compensation |
| Pin 11 | PGOOD β Power good output (open-drain) |
| Pin 12 | GND β Ground |
| Pin 13 | SW2 β Switch node connection for the boost stage |
| Pin 14 | PVOUT β Power output supply |
| Pin 15 | VOUT β Output voltage sense |
| Pin 16 | VCC β Internal supply output (bypass with capacitor) |
| Pin 17 | GND β Ground |
| Pin 18 | GND β Ground |
| Pin 19 | GND β Ground |
| Pin 20 | GND β Ground (exposed pad) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LTC3115-2IDE#PBF is suitable for 6 applications: Automotive Power Supplies, Industrial Sensors and Actuators, Portable Battery-Powered Devices, RF and Communication Systems, Test and Measurement Equipment, Medical Devices.
Automotive Power Supplies
The LTC3115-2IDE#PBF is ideal for automotive power supplies due to its wide 2.7V to 40V input range, which handles load dumps and cold-crank conditions. Its fast transient response (1ms) ensures stable output during sudden load steps in infotainment, ADAS, and telematics systems. The synchronous buck-boost topology maintains regulation when the battery voltage drops below the output, providing a clean 5V or 3.3V rail for microcontrollers and sensors. With 2A output capability, it can power multiple loads, and the low noise algorithm minimizes EMI in sensitive automotive electronics.
Recommended
Industrial Sensors and Actuators
In industrial environments, the LTC3115-2IDE#PBF provides a regulated output from unregulated 24V or 12V rails, which can vary widely. Its 2A output current supports sensors, actuators, and communication interfaces. The wide input range (2.7V to 40V) accommodates voltage sags and surges, while the programmable switching frequency (300kHz to 2MHz) allows optimization for efficiency or size. The low noise operation is critical for precision analog sensors, and the power good output enables system monitoring. The device's robust design operates over -40C to +125C, suitable for harsh industrial conditions.
Recommended
Portable Battery-Powered Devices
The LTC3115-2IDE#PBF is well-suited for portable devices powered by batteries that discharge from 4.2V down to 2.7V. The buck-boost topology maintains a constant output voltage (e.g., 3.3V) regardless of battery state, maximizing usable battery capacity. Its high efficiency (up to 95%) extends battery life, and the low quiescent current in sleep modes helps meet standby requirements. The small 20-TSSOP package and programmable frequency allow compact designs. The device's fast transient response handles sudden load changes from wireless transmitters or motors.
Recommended
RF and Communication Systems
The LTC3115-2IDE#PBF's low noise switching algorithm reduces output ripple and EMI, making it suitable for powering RF transceivers, PLLs, and other noise-sensitive components. The wide input range allows operation from various supply rails, and the 2A output can power high-current RF amplifiers. The programmable frequency enables placement of switching harmonics away from RF bands. The fast transient response ensures stable voltage during burst transmissions. The device's synchronous architecture provides high efficiency, reducing heat in compact enclosures.
Recommended
Test and Measurement Equipment
In test and measurement equipment, the LTC3115-2IDE#PBF provides a clean, regulated supply for precision analog circuits. Its low noise output and high PSRR ensure minimal interference with sensitive measurements. The wide input range accepts various bench supply voltages, and the 2A output can power multiple test circuits. The programmable frequency allows synchronization with measurement clocks to avoid interference. The device's fast transient response maintains accuracy during dynamic load changes, and the power good output aids in system diagnostics.
Recommended
Medical Devices
The LTC3115-2IDE#PBF is suitable for battery-powered medical devices such as portable monitors and infusion pumps, where reliable power is critical. Its wide input range accommodates battery voltage variations, and the high efficiency extends battery life. The low noise operation is essential for sensitive analog front-ends. The device's robust design meets medical temperature requirements, and the power good output enables fail-safe monitoring. The 2A output can power motors, displays, and wireless communication modules.
Recommended
Recommended Products Summary
Engineering reference data for LTC3115-2IDE#PBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3115IFE-2#PBF | LTC3115EFE-2#PBF | LTC3115EFE-1#PBF | LTC3115IFE-1#PBF |
|---|---|---|---|---|---|
| Package | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V | 2.7V to 40V |
| Output Voltage Range | 2.7V to 18V | 2.7V to 18V | 2.7V to 18V | 2.7V to 18V | 2.7V to 18V |
| Maximum Output Current | 2A | 2A | 2A | 2A | 2A |
| Switching Frequency | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz |
| Operating Temperature Range | -40C to +125C | -40C to +125C | 0C to +70C | 0C to +70C | -40C to +125C |
| Transient Optimization | Fast (1ms) | Fast (1ms) | Fast (1ms) | Standard | Standard |
Key Differentiators
- Optimized for fast input transients (1ms) (vs LTC3115EFE-1#PBF)
- Industrial temperature grade (vs LTC3115EFE-2#PBF)
- Low noise switching algorithm (vs LTC3115IFE-1#PBF)
Design Notes
For optimal performance, place the input and output capacitors as close as possible to the PVIN and PVOUT pins. Use low-ESR ceramic capacitors (e.g., 10uF X5R) for input and output. The switching nodes (SW1, SW2) should have minimal copper area to reduce EMI, but ensure adequate trace width for current. The exposed pad (GND) must be soldered to a large copper pour for thermal dissipation.
The LTC3115-2IDE#PBF can dissipate significant power at high input-output differentials and 2A load. For example, at VIN=12V, VOUT=5V, and 2A, power loss is approximately 2W (assuming 90% efficiency). The 20-TSSOP package has a thermal resistance of about 40C/W (theta_JA) with proper PCB copper. Ensure adequate copper area and airflow to keep junction temperature below 125C.
Do not exceed the absolute maximum input voltage of 40V. The RUN pin must be pulled high to enable the device; floating it may cause unpredictable operation. The SS pin should have a capacitor to set soft-start time; omitting it can cause inrush current. The FREQ pin must be connected to a resistor to set the switching frequency; leaving it open may result in unstable operation. Always refer to the datasheet for proper component selection.
Compliance Information
RoHS compliant per Analog Devices product page. Lead-free (PBF suffix). AEC-Q100 qualification not specified for this variant; check datasheet for automotive grade options.
