LTC7840

RECOMMENDED FOR NEW DESIGNS

2-Phase Dual Output Non-Synchronous Boost Controller with Hiccup Mode

Data Sheet (Rev. 0) Product Selection Table

Part Models: 12
1ku List Price: Starting From $3.77

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Overview

Wide V_IN Range: 5.5V to 60V
Configurable for Dual Phase Single/Dual Output Operation
Peak Current Mode Control with Smooth Quadratic Slope Compensation and Dynamic Slope Recovery
Adjustable Max Duty Cycle
Adjustable Min On-Time
Hiccup Mode for Overcurrent Protection

Adjustable Current Sense Limit
Output Overvoltage Protection
Programmable and Phase-Lockable Operating Frequency (from 50kHz to 425kHz)
Adjustable Soft-Start Current Ramping
±1% Internal Voltage Reference
Internal 10V LDO Regulator for Gate Driver
Two RUN Pins and Dual Power Good Monitors
Flexible Topology for Boost, SEPIC and Flyback

The LTC^®7840 is a dual phase dual output, constant frequency current mode, nonsynchronous boost controller that drives N-channel power MOSFETs. The nonsynchronous topology makes the output voltage dependent on the choice of external components.

A wide 5.5V to 60V input supply range can accommodate high input voltage surges. The LTC7840 can be configured as a dual phase single output or dual output controller. It can be also configured for the SEPIC and flyback topologies. The switching frequency is programmed by the voltage on the FREQ pin or synchronized to an external clock. The LTC7840 features a precise 1.2V internal reference. It has two RUN pins and two power good output indicators.

The LTC7840 has an internal 10V LDO with undervoltage lockout protection for its on-chip gate driver. The maximum duty cycle and blanking time can be programmed by the voltage on D_MAX and BLANK pins, respectively. The hiccup mode protects the system in the event of faults.

The LTC7840 is available in a 28-lead thermally enhanced TSSOP package (FE28) or a 28-lead QFN package (UFD28).

Applications

Automotive System, Telecom System and Industrial Power Supplies

Part Models: 12
1ku List Price: Starting From $3.77

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
LTC7840EFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840EFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840HFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840HFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840HUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840HUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840IFE#PBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840IFE#TRPBF	28-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7840IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LTC7840EFE#PBF	PRODUCTION
LTC7840EFE#TRPBF	PRODUCTION
LTC7840HFE#PBF	PRODUCTION
LTC7840HFE#TRPBF	PRODUCTION
LTC7840IFE#PBF	PRODUCTION
LTC7840IFE#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC7840EUFD#PBF	PRODUCTION
LTC7840EUFD#TRPBF	PRODUCTION
LTC7840HUFD#PBF	PRODUCTION
LTC7840HUFD#TRPBF	PRODUCTION
LTC7840IUFD#PBF	PRODUCTION
LTC7840IUFD#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC7840

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

LTC7840EFE#PBF Demo Board | 9V ≤ VIN ≤ 36V, VOUT = 240V @ 0.7A

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Product Details

Demonstration circuit DC2744 is a two stage DC/DC boost converter featuring the LTC7840, a constant frequency current mode boost controller. The DC2744A operates over a 9V to 36V input voltage range. The first stage boost generates V_OUT1 at 48V. The second stage boost takes this 48V input and provides a 240V output with 0.7A of load current. The 150kHz constant frequency operation results in a small and efficient circuit. The converter provides high output voltage accuracy (typically ±3%) over a wide load range with no minimum load requirement. The demonstration circuit can be easily modified to generate different output voltages.

The DC2744 has small circuit footprint. It is a high performance cost effective solution for applications that require high step-up voltage ratios and high output power.