LTC3625

RECOMMENDED FOR NEW DESIGNS

1A High Efficiency 2-Cell Supercapacitor Charger with Automatic Cell Balancing

Part Models: 8
1ku List Price: Starting From $3.61

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Overview

High Efficiency Step-Up/Step-Down Charging of Two Series Supercapacitors
Automatic Cell Balancing Prevents Capacitor Overvoltage During Charging
Programmable Charging Current Up to 500mA (Single Inductor), 1A (Dual Inductor)
V_IN = 2.7V to 5.5V
Selectable 2.4V/2.65V Regulation per Cell (LTC3625)
Selectable 2V/2.25V Regulation per Cell (LTC3625-1)
Low No-Load Quiescent Current: 23μA
I_VOUT, I_VIN < 1μA in Shutdown
Low Profile 12-lead 3mm × 4mm DFN Package

The LTC3625/LTC3625-1 are programmable supercapacitor chargers designed to charge two supercapacitors in series to a fixed output voltage (4.8V/5.3V or 4V/4.5V selectable) from a 2.7V to 5.5V input supply. Automatic cell balancing prevents overvoltage damage to either supercapacitor while maximizing charge rate. No balancing resistors are required.

High efficiency, high charging current, low quiescent current and low minimum external parts count (one inductor, one bypass capacitor at V_IN and one programming resistor) make the LTC3625/LTC3625-1 ideally suited for small form factor backup or high peak power systems.

Charging current/maximum input current level is programmed with an external resistor. When the input supply is removed and/or the EN pin is low, the LTC3625/LTC3625-1 automatically enter a low current state, drawing less than 1μA from the supercapacitors.

The LTC3625/LTC3625-1 are available in a compact 12‑lead 3mm × 4mm × 0.75mm DFN package.

Applications

Servers, RAID Systems, Mass Storage, High Current Backup Supplies
Solid State Hard Drives
Wireless Power Meters
High Peak Power Boosted Supplies

Part Models: 8
1ku List Price: Starting From $3.61

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
LTC3625EDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625EDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625EDE-1#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625EDE-1#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625IDE#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625IDE#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625IDE-1#PBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3625IDE-1#TRPBF	12-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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
Switching Regulators & Controllers 1
LTC4425	RECOMMENDED FOR NEW DESIGNS	Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor

Tools & Simulations

LTspice 1

LTC3625/LT1784/LT1634 Demo Circuit - Solar Powered SCAP Charger with MPPT

Models for the following parts are available in LTspice:

LTC3625
LTC3625-1

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

LTC3625-1EDE Demo Board | VIN = 2.7V to 5.5V, VOUT = 4.5V or 4.0V @ IOUT up to 1A

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Product Details

Demonstration circuit 1583A is a 1A high efficiency 2-Cell supercapacitor charger with automatic cell balancing featuring the LTC3625/LTC3625-1. The LTC3625/LTC3625-1 are step-up/step-down programmable supercapacitor chargers designed to charge two supercapacitors in series to a fixed voltage of 5.3V or 4.8V (LTC3625), or 4.5V or 4.0V (LTC3625-1) from a 2.7V to 5.5V input supply. Automatic cell balancing is achieved during the charging phase, preventing overvoltage damage to either supercapacitor while maximizing charge rate.