LTC4425

RECOMMENDED FOR NEW DESIGNS

Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor

Part Models: 8
1ku List Price: Starting From $2.72

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Overview

50mΩ Ideal Diode from V_IN to V_OUT
Smart Charge Current Profile Limits Inrush Current
Internal Cell Balancer (No External Resistors)
Programmable Output Voltage (LDO Mode)
Programmable V_IN to V_OUT Current Limit
Continuous Monitoring of V_IN to V_OUT Current via PROG Pin
Low Quiescent Current: 20μA
V_IN Power Fail, PGOOD Indicator
2.45V/2.7V Cell Protection Shunts (4.9V/5.4V SuperCap Max Top-Off Voltage)
3A Peak Current Limit, Thermal Limiting
Tiny Application Circuit, 3mm × 3mm × 0.75mm DFN and 12-Lead MSOP Packages

The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-Ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply. The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low average power applications. The LTC4425 charges the output capacitors to an externally programmed output voltage in LDO mode at a constant charge current, or to V_IN in normal mode with a smart charge current profile to limit the inrush current until the V_IN to V_OUT differential is less than 250mV. In addition the LTC4425 can be set to clamp the output voltage to 4.9V or 5.4V.

Charge current (V_OUT current limit) is programmed by connecting a resistor between PROG and GND. The voltage on the PROG pin represents the current fl owing from V_IN to V_OUT for current monitoring. An internal active balancing circuit maintains equal voltages across each supercapacitor and clamps the peak voltage across each cell to a pin-selectable maximum value. The LTC4425 operates at a very low 20μA quiescent current (shutdown current <3μA) and is available in a low profile 12-pin 3mm × 3mm DFN or a 12-lead MSOP package.

Applications

High Peak Power Battery/USB Powered Equipment
Industrial PDAs
Portable Instruments/Monitoring Equipment
Power Meters, SuperCap Backup Circuits
PC Card/USB Modems

Part Models: 8
1ku List Price: Starting From $2.72

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
LTC4425EDD#PBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425EDD#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425EMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425EMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425IDD#PBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425IDD#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425IMSE#PBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4425IMSE#TRPBF	12-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC4425EMSE#PBF	PRODUCTION
LTC4425EMSE#TRPBF	PRODUCTION
LTC4425IMSE#PBF	PRODUCTION
LTC4425IMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0129_Form Material_Report
LTC4425EMSE#PBF	PRODUCTION
LTC4425EMSE#TRPBF	PRODUCTION
LTC4425IMSE#PBF	PRODUCTION
LTC4425IMSE#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
Battery Charger ICs 1
LTM8052 LTM8052A		36V_IN, 5A, 2-Quadrant CVCC Step-Down μModule Regulator
Charge Pumps 1
LTC3625	RECOMMENDED FOR NEW DESIGNS	1A High Efficiency 2-Cell Supercapacitor Charger with Automatic Cell Balancing

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4425

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.