LTC3112EFE#PBF - 15V, 2.5A Sync Buck-Boost DC/DC | Analog Devices
MPN: LTC3112EFE#PBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.72 | $6.72 |
| 10 | $6.05 | $60.50 |
| 100 | $5.38 | $538.00 |
| 500 | $4.84 | $2,420.00 |
| 1,000 | $4.3 | $4,300.00 |
Drop-in alternatives for LTC3112EFE#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:
LTC3112EFE#TRPBF
β Drop-Inβ In Stock
$3.48 / Unit
View Datasheet βLTC3112IFE#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3115HFE-1#PBF
β‘ Same Packageπ Reference alternative (not in catalog)
LTC3112EFE#PBF Maximum Ratings & Electrical Characteristics
| Function | Buck-Boost |
| Output Type | Adjustable |
| Output Voltage Range | 2.5V to 14V |
| Maximum Output Current | 2.5A |
| Input Voltage Range | 2.7V to 15V |
| Switching Frequency | 1.2MHz (typical) |
| Synchronous Rectification | Yes |
| Number of Outputs | 1 |
| Package | 20-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Quiescent Current (Shutdown) | 1Β΅A (typical) |
| Soft Start | Yes |
| Thermal Shutdown | Yes |
| RoHS Status | Compliant |
LTC3112EFE#PBF Pin Configuration
| Pin 1 | SW1 β Switch node connection for inductor |
| Pin 2 | PVIN1 β Power input supply |
| Pin 3 | PVIN2 β Power input supply |
| Pin 4 | SHDN β Shutdown control (active low) |
| Pin 5 | VIN β Input supply for internal circuitry |
| Pin 6 | VOUT β Output voltage sense |
| Pin 7 | FB β Feedback input for output regulation |
| Pin 8 | VCC β Internal regulated supply |
| Pin 9 | GND β Ground |
| Pin 10 | GND β Ground |
| Pin 11 | GND β Ground |
| Pin 12 | GND β Ground |
| Pin 13 | GND β Ground |
| Pin 14 | GND β Ground |
| Pin 15 | GND β Ground |
| Pin 16 | GND β Ground |
| Pin 17 | GND β Ground |
| Pin 18 | GND β Ground |
| Pin 19 | SW2 β Switch node connection for inductor |
| Pin 20 | PVOUT β Power output supply |
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
LTC3112EFE#PBF is suitable for 6 applications: Battery-Powered Portable Devices, Industrial Power Supplies, RF Transmitters and Power Amplifiers, LED Lighting with Current Regulation, Multiple Power Input Systems, Backup Capacitor Stack.
Battery-Powered Portable Devices
The LTC3112EFE#PBF is ideal for portable devices powered by 1-3 Li-Ion cells, providing a regulated 3.3V or 5V rail. Its wide 2.7V to 15V input range ensures stable output as the battery discharges from 4.2V down to 2.7V. The low shutdown current of 1Β΅A extends standby time, and the 2.5A output can power application processors, displays, and wireless modules. The synchronous architecture achieves up to 95% efficiency, minimizing heat in compact enclosures. Designers should select an inductor with appropriate saturation current and use low-ESR ceramic capacitors for stable operation.
Recommended
Industrial Power Supplies
In industrial systems, the LTC3112EFE#PBF can generate a regulated 12V rail from a 12V lead-acid battery that may sag to 9V or rise to 15V during charging. Its buck-boost topology maintains a constant output despite these fluctuations. The 2.5A output can drive sensors, actuators, and communication interfaces. The device's thermal shutdown and current mode control provide robust protection in harsh environments. For best performance, ensure adequate PCB copper area for heat dissipation and place the inductor close to the IC to minimize parasitic inductance.
Recommended
RF Transmitters and Power Amplifiers
The LTC3112EFE#PBF provides a clean, low-noise supply for RF power amplifiers and transmitters. Its 4-switch architecture minimizes output voltage ripple, which is critical for maintaining signal integrity. The 2.5A output can support high-power RF modules, and the 1.2MHz switching frequency is above the AM band, reducing interference. The adjustable output allows precise voltage setting for optimal PA efficiency. Use a low-ESR output capacitor and a shielded inductor to further reduce EMI.
Recommended
LED Lighting with Current Regulation
The LTC3112EFE#PBF can be configured as a constant-current source for LED lighting, maintaining consistent brightness as the input voltage varies. Its buck-boost capability allows it to drive LEDs from a wide range of sources, such as 12V automotive systems or battery packs. The 2.5A output can power multiple high-brightness LEDs in series. The device's high efficiency reduces heat generation, and its PWM dimming capability (via the SHDN pin) enables precise brightness control. Ensure the inductor is rated for the peak current and use a sense resistor with appropriate power rating.
Recommended
Multiple Power Input Systems
The LTC3112EFE#PBF is ideal for systems that can be powered from multiple sources, such as USB, battery, or AC adapter. Its wide input range allows it to accept any of these sources and produce a stable output. The seamless transition between buck and boost modes ensures no glitches when switching sources. The 2.5A output can power the entire system, and the low shutdown current helps preserve battery when external power is present. Designers should implement input OR-ing diodes or a power path controller to manage multiple sources.
Recommended
Backup Capacitor Stack
The LTC3112EFE#PBF can efficiently charge and discharge a backup capacitor stack, providing hold-up power during brief power interruptions. Its buck-boost topology allows it to charge the capacitor stack to a voltage higher than the input, and then boost the capacitor voltage to maintain a regulated output as it discharges. The 2.5A output can support critical loads like solid-state drives or industrial controllers. The device's high efficiency maximizes the usable energy stored in the capacitors. Use supercapacitors with appropriate voltage ratings and ensure the charging current is limited.
Recommended
Recommended Products Summary
Engineering reference data for LTC3112EFE#PBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3112EFE#TRPBF | LTC3112IFE#PBF | LTC3112IDHD#TRPBF | LTC3112MPDHD#PBF | LTC3115HFE-1#PBF |
|---|---|---|---|---|---|---|
| Package | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | 20-TSSOP Exposed Pad | DFN-16 | DFN-16 | TSSOP-20 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2.7V to 40V |
| Output Current | 2.5A | 2.5A | 2.5A | 2.5A | 2.5A | 2A |
| Output Voltage Range | 2.5V to 14V | 2.5V to 14V | 2.5V to 14V | 2.5V to 14V | 2.5V to 14V | 1.8V to 40V |
| Switching Frequency | 1.2MHz | 1.2MHz | 1.2MHz | 1.2MHz | 1.2MHz | 1.2MHz |
| Operating Temperature Range | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +125Β°C | -40Β°C to +125Β°C | -55Β°C to +150Β°C | -40Β°C to +125Β°C |
| Shutdown Current | 1Β΅A | 1Β΅A | 1Β΅A | 1Β΅A | 1Β΅A | 1Β΅A |
Key Differentiators
- Higher output current than LTC3115HFE-1#PBF (vs LTC3115HFE-1#PBF)
- Wider input voltage range than LTC3112IDHD#TRPBF (vs LTC3112IDHD#TRPBF)
- Lower shutdown current than many competitors (vs LTC3115HFE-1#PBF)
Design Notes
For optimal performance, place the input and output capacitors as close as possible to the IC pins. Use a 10Β΅F ceramic capacitor on the input and a 22Β΅F ceramic capacitor on the output. The inductor should be placed near the SW pins to minimize parasitic inductance. Ensure a solid ground plane under the IC and connect the exposed pad to the ground plane with multiple vias for thermal and electrical performance.
The LTC3112EFE#PBF can dissipate significant power at high output currents. The TSSOP-20 package with exposed pad has a thermal resistance of approximately 40Β°C/W. At 2.5A output and 5V output from 12V input, power dissipation is about 2.5W, leading to a 100Β°C temperature rise. Use a copper pour of at least 1 square inch on the PCB to keep the junction temperature below 125Β°C. Consider forced airflow if ambient temperature is high.
Avoid using an inductor with insufficient saturation current rating, as this can cause core saturation and efficiency loss. The inductor should be rated for at least 3A saturation current. Also, ensure the feedback resistor divider uses 1% tolerance resistors to maintain output voltage accuracy. Do not exceed the absolute maximum input voltage of 15V, as this can damage the IC. Use a Schottky diode from SW to GND if the output is shorted to protect the internal switches.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free finish.
