LTC3112IDE#PBF - 15V, 2.5A Buck-Boost DC/DC | Analog Devices
MPN: LTC3112IDE#PBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.16 | $4,160.00 |
Drop-in alternatives for LTC3112IDE#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:
LTC3112IDD#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3112EDE#PBF
β Drop-Inπ Reference alternative (not in catalog)
LTC3112IDE#PBF Maximum Ratings & Electrical Characteristics
| Function | Buck-Boost |
| Output Current | 2.5 A |
| Input Voltage Range | 2.7 V to 15 V |
| Output Voltage Range | 2.5 V to 15 V |
| Switching Frequency | 300 kHz to 2 MHz |
| Quiescent Current | 40 uA (Burst Mode) |
| Efficiency | Up to 95% |
| Package | 16-pin DFN (4mm x 5mm x 0.75mm) |
| Operating Temperature | -40C to +125C |
| Mounting Type | Surface Mount |
| Synchronous Rectifier | Yes |
| Power Good Indicator | Yes |
| Soft Start | Yes |
| RoHS Status | Compliant |
| Lead Free | Yes |
LTC3112IDE#PBF Pin Configuration
| Pin 1 | SW1 β Switch node 1 |
| Pin 2 | PVIN β Power input |
| Pin 3 | VIN β Input supply |
| Pin 4 | RUN β Enable input |
| Pin 5 | SYNC/MODE β Synchronization and mode select |
| Pin 6 | PGOOD β Power good output |
| Pin 7 | VFB β Feedback input |
| Pin 8 | ITH β Error amplifier output |
| Pin 9 | SS β Soft-start |
| Pin 10 | GND β Ground |
| Pin 11 | SW2 β Switch node 2 |
| Pin 12 | PVOUT β Power output |
| Pin 13 | VOUT β Output voltage sense |
| Pin 14 | PGND β Power ground |
| Pin 15 | NC β No connect |
| Pin 16 | NC β No connect |
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
LTC3112IDE#PBF is suitable for 6 applications: Battery-Powered Portable Devices, RF Transmitter Power Supply, LED Lighting with Current Regulation, 12V Lead-Acid Battery to 12V Conversion, Multiple Power Input Systems, Backup Capacitor Stack.
Battery-Powered Portable Devices
The LTC3112IDE#PBF is ideal for generating regulated 3.3V or 5V rails from 1, 2, or 3 Li-Ion cells. Its wide input range (2.7V to 15V) accommodates the varying voltage of discharging batteries, while the buck-boost topology ensures a stable output even when the battery voltage drops below the output. The low 40uA quiescent current in Burst Mode extends battery life in standby, and the high efficiency (up to 95%) minimizes power loss during active operation. This makes it perfect for handheld terminals, portable instruments, and wireless sensors where battery life is critical.
Recommended
RF Transmitter Power Supply
The LTC3112IDE#PBF provides a clean, low-noise power rail for RF transmitters, which require stable voltage to maintain signal integrity. Its 4-switch architecture and current-mode control deliver low output ripple and fast transient response, essential for handling the pulsed loads of RF power amplifiers. The wide input range allows operation from various battery configurations, and the high output current (2.5A) supports high-power transmitters. The power good indicator helps with system sequencing, ensuring the transmitter is enabled only when the supply is stable.
Recommended
LED Lighting with Current Regulation
The LTC3112IDE#PBF can be configured for constant current LED driving, making it suitable for LED lighting applications. Its buck-boost topology ensures a constant current to the LED string even when the input voltage varies, such as from a battery or a 12V rail. The high output current (2.5A) can drive multiple high-power LEDs, and the adjustable switching frequency allows optimization for efficiency or component size. The device's high efficiency reduces heat generation, which is critical in enclosed lighting fixtures.
Recommended
12V Lead-Acid Battery to 12V Conversion
The LTC3112IDE#PBF is well-suited for converting a 12V lead-acid battery voltage to a regulated 12V output. Lead-acid batteries can vary from 10.5V (discharged) to 14.4V (charging), and the buck-boost topology maintains a constant 12V output across this range. This is essential for automotive and industrial systems that require a stable 12V rail. The device's high efficiency and thermal performance ensure reliable operation in harsh environments, and the wide input range provides headroom for voltage transients.
Recommended
Multiple Power Input Systems
The LTC3112IDE#PBF is ideal for systems that can be powered from multiple sources, such as USB, battery, or AC adapter. Its wide input range (2.7V to 15V) allows it to accept any of these sources, and the buck-boost topology ensures a regulated output regardless of which source is active. This simplifies the power management design, as a single converter can handle all input scenarios. The power good indicator and soft-start features facilitate smooth transitions between power sources.
Recommended
Backup Capacitor Stack
The LTC3112IDE#PBF can efficiently convert the voltage from a backup capacitor stack to a regulated output, providing ride-through power during brief interruptions. Capacitor stacks have a wide voltage range as they discharge, and the buck-boost topology maintains a constant output until the capacitor is nearly depleted. This is useful in applications like industrial controllers and data loggers that require uninterrupted power. The low quiescent current and high efficiency maximize the usable energy from the capacitor.
Recommended
Recommended Products Summary
Engineering reference data for LTC3112IDE#PBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC3112IFE#PBF | LTC3112MPFE#PBF | LTC3112IDD#PBF | LTC3112EDE#PBF | TPS63070RNMT |
|---|---|---|---|---|---|---|
| Package | 16-pin DFN | 20-pin TSSOP | 20-pin TSSOP | 16-pin DFN | 16-pin DFN | VQFN-15 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Voltage Range | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2.7V to 15V | 2V to 16V |
| Output Current | 2.5A | 2.5A | 2.5A | 2.5A | 2.5A | 2A |
| Switching Frequency | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 300kHz to 2MHz | 2.4MHz |
| Quiescent Current | 40uA | 40uA | 40uA | 40uA | 40uA | 50uA |
| Operating Temperature | -40C to +125C | -40C to +125C | -55C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
| Power Good Indicator | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Wide input voltage range (2.7V to 15V) (vs TPS63070RNMT)
- Low quiescent current (40uA) (vs TPS63070RNMT)
- Programmable switching frequency (300kHz to 2MHz) (vs TPS63070RNMT)
Design Notes
For optimal performance, place the input and output capacitors as close as possible to the IC pins. Use low-ESR ceramic capacitors (e.g., 10uF) for input and output. The inductor should be placed near the SW pins to minimize parasitic inductance. Ensure a solid ground plane and use vias to connect the exposed pad to the ground plane for thermal relief.
The LTC3112IDE#PBF can dissipate significant power at high output currents. The 16-pin DFN package has an exposed pad that must be soldered to a copper area on the PCB to act as a heatsink. For example, at 2.5A output with 5V to 3.3V conversion, power dissipation is about 1.25W, requiring a copper area of at least 1 square inch to keep junction temperature below 125C.
Do not exceed the absolute maximum input voltage of 15V. Ensure the feedback resistor divider uses 1% tolerance resistors to maintain output voltage accuracy. The SYNC/MODE pin should be tied to a logic level or an external clock to avoid noise. Also, the soft-start capacitor should be chosen to limit inrush current, especially when powering large capacitive loads.
Compliance Information
RoHS compliant and lead-free per Analog Devices. Not AEC-Q100 qualified.
