LTC7815
Low IQ, 2.25MHz, Triple Output, Buck/Buck/Boost Synchronous Controller
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Overview
Features and Benefits
- Dual Buck Plus Single Boost Synchronous Controllers
- Wide Bias Input Voltage Range: 4.5V to 38V
- Outputs Remain in Regulation Through Cold Crank Down to a 2.5V Input Supply Voltage
- Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
- Boost Output Voltage Up to 60V
- Low Operating IQ: 28μA (One Channel On)
- RSENSE or DCR Current Sensing
- 100% Duty Cycle for Boost Synchronous MOSFET Even in Burst Mode® Operation
- Phase-Lockable Frequency (320kHz to 2.25MHz)
- Programmable Fixed Frequency (320kHz to 2.25MHz)
- Very Low Buck Dropout Operation: 98% Duty Cycle
- Small 38-Lead 5mm × 7mm QFN Package
Product Details
The LTC7815 is a high performance triple output (buck/buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 2.25MHz. The LTC7815 operates from a wide 4.5V to 38V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7815 can operate from an input supply as low as 2.5V after start-up.
The 28μA no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7815 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.
Applications
- Automotive Always-On and Start-Stop Systems
- Battery Operated Digital Devices
- Distributed DC Power Systems
- Multioutput Buck-Boost Applications
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
R526 Reliability Data3/26/2018
-
DC2738A - Demo Board Manual2/2/2018
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LTC7815
Product Recommendations
LTC7815 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC7815EUHF#PBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC7815EUHF#TRPBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC7815HUHF#PBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC7815HUHF#TRPBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC7815IUHF#PBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC7815IUHF#TRPBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| Wafer Fabrication Data | R526 Reliability Data |
PCN-PDN Information
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Sample & Buy
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Buy Now Pricing
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List Pricing
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Lead Times
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.