LTC3122
RECOMMENDED FOR NEW DESIGNS15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect
- Part Models
- 10
- 1ku List Price
- Starting From $3.56
Overview
- VIN Range: 1.8V to 5.5V, 500mV After Start-Up
- Output Voltage Range: 2.2V to 15V
- 800mA Output Current for VIN = 5V and VOUT = 12V
- Output Disconnects from Input When Shut Down
- Synchronous Rectification: Up to 95% Efficiency
- Inrush Current Limit
- Up to 3MHz Adjustable Switching Frequency Synchronizable to External Clock
- Selectable Burst Mode® Operation: 25μA IQ
- Output Overvoltage Protection
- Soft-Start
- <1μA IQ in Shutdown
- 12-Lead, 3mm × 4mm × 0.75mm Thermally Enhanced DFN and MSOP Packages
The LTC3122 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting. The 2.5A current limit along with the ability to program output voltages up to 15V makes the LTC3122 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to 500mV, extending runtime in many applications.
The LTC3122 features output disconnect in shutdown, dramatically reducing input power drain and enabling VOUT to completely discharge. Adjustable PWM switching from 100kHz to 3MHz optimizes applications for highest efficiency or smallest solution footprint. The oscillator can also be synchronized to an external clock for noise sensitive applications. Selectable Burst Mode operation reduces quiescent current to 25μA, ensuring high efficiency across the entire load range. An internal soft-start limits inrush current during start-up.
Other features include a <1μA shutdown current and robust protection under short-circuit, thermal overload, and output overvoltage conditions. The LTC3122 is offered in both a low profile 12-lead (3mm × 4mm × 0.75 mm) DFN package and a 12-lead thermally enhanced MSOP package.
Applications
- RF Power
- Piezo Actuators
- Small DC Motors
- 12V Analog Rail From Battery, 5V, or Backup Capacitor
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3122EDE#PBF | 12-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC3122EDE#TRPBF | 12-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC3122EMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC3122EMSE#TRPBF | 12-Lead MSOP w/ EP | ||
| LTC3122HMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC3122HMSE#TRPBF | 12-Lead MSOP w/ EP | ||
| LTC3122IDE#PBF | 12-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC3122IDE#TRPBF | 12-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC3122IMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC3122IMSE#TRPBF | 12-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3122EDE#PBF | PRODUCTION | |
| LTC3122EDE#TRPBF | PRODUCTION | |
| LTC3122IMSE#PBF | PRODUCTION | |
| LTC3122IMSE#TRPBF | PRODUCTION | |
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3122EMSE#PBF | PRODUCTION | |
| LTC3122EMSE#TRPBF | PRODUCTION | |
| LTC3122HMSE#PBF | PRODUCTION | |
| LTC3122HMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC |
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| LTC3122EMSE#PBF | PRODUCTION | |
| LTC3122EMSE#TRPBF | PRODUCTION | |
| LTC3122HMSE#PBF | PRODUCTION | |
| LTC3122HMSE#TRPBF | PRODUCTION | |
| LTC3122IMSE#PBF | PRODUCTION | |
| LTC3122IMSE#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LTC3122HMSE#PBF | PRODUCTION | |
| LTC3122HMSE#TRPBF | PRODUCTION | |
|
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LTC3122HMSE#PBF | PRODUCTION | |
| LTC3122HMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4417 | RECOMMENDED FOR NEW DESIGNS | Prioritized PowerPath™ Controller |
| Oscillators 1 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3124 | RECOMMENDED FOR NEW DESIGNS | 15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect |
Tools & Simulations
LTspice 2
- LTC3122 Demo Circuit - 5V to 12V Synchronous Boost Converter with Output Disconnect (1.8-5.5V to 12V @ 0.8A)
- LTC3122 Demo Circuit - Dual Supercapacitor Backup Power Supply (0.5-5V to 5V @ 50mA)
Models for the following parts are available in LTspice:
- LTC3122
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3122
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
