LTC7815

PRODUCTION

Low IQ, 2.25MHz, Triple Output, Buck/Buck/Boost Synchronous Controller

Part Models: 6
1ku List Price: Starting From $4.72

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Overview

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 ≤ V_OUT ≤ 24V
Boost Output Voltage Up to 60V
Low Operating I_Q: 28μA (One Channel On)
R_SENSE 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

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

Part Models: 6
1ku List Price: Starting From $4.72

Documentation

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
LTC7815EUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7815EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7815HUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7815HUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7815IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7815IUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC7815EUHF#PBF	PRODUCTION
LTC7815EUHF#TRPBF	PRODUCTION
LTC7815HUHF#PBF	PRODUCTION
LTC7815HUHF#TRPBF	PRODUCTION
LTC7815IUHF#PBF	PRODUCTION
LTC7815IUHF#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 2
LTC4380	RECOMMENDED FOR NEW DESIGNS	Low Quiescent Current Surge Stopper
LTC4231	RECOMMENDED FOR NEW DESIGNS	Micropower Hot Swap Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC7815

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.

Evaluation Kits

LTC7815EUHF Demo Board | 4.5V ≤ VIN ≤ 36V; VOUT1: 5V @ 8A, VOUT2: 3.3V @ 8A, VOUT3: 10V @ 7A

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Product Details

Demonstration circuit 2738A is a triple output synchronous step-up/dual step-down supply featuring the LTC^®7815. The demonstration circuit is designed for two buck 5V/8A, 3.3V/8A outputs supplied by a boost 10V/7A output. Benefiting from this feature, the buck outputs are able to maintain regulation over a wide input voltage range of 4.5V to 36V which is suitable for automotive or other battery fed applications. Also, the demonstration circuit uses a drop-in layout that the main buck circuit components fit in an area of three-quarter inches by 1.5 inches, while the main boost circuit area is three-quarter inches by 1.75 inches. The package style for the LTC7815 is a 38-pin exposed pad QFN.