LTC3225

PRODUCTION

150mA Supercapacitor Charger

Part Models: 4
1ku List Price: Starting From $2.66

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Overview

Low Noise Constant Frequency Charging of Two Series Supercapacitors
Automatic Cell Balancing Prevents Capacitor Overvoltage During Charging
Programmable Charge Current (Up to 150mA)
Selectable 2.4V or 2.65V Regulation per Cell (LTC3225)
Selectable 2V or 2.25V Regulation per Cell (LTC3225-1)
Automatic Recharge
I_VIN = 20μA in Standby Mode
I_COUT < 1μA When Input Supply is Removed
No Inductors
Tiny Application Circuit (2mm × 3mm DFN Package, All Components <1mm High)

The LTC3225/LTC3225-1 are programmable supercapacitor chargers designed to charge two supercapacitors in series to a selectable fixed output voltage (4.8V/5.3V for the LTC3225 and 4V/4.5V for the LTC3225-1) from input supplies as low as 2.8V to 5.5V. Automatic cell balancing prevents overvoltage damage to either supercapacitor. No balancing resistors are required.

Low input noise, low quiescent current and low external parts count (one flying capacitor, one bypass capacitor at V_IN and one programming resistor) make the LTC3225/LTC3225-1 ideally suited for small battery-powered applications.

Charge current level is programmed with an external resistor. When the input supply is removed, the LTC3225/LTC3225-1 automatically enter a low current state, drawing less than 1μA from the supercapacitors.

The LTC3225/LTC3225-1 are available in a 10-lead 2mm × 3mm DFN package.

Applications

Current Limited Applications with High Peak Power Loads (LED Flash, PCMCIA Tx Bursts, HDD Bursts, GPRS/GSM Transmitter)
Backup Supplies

Part Models: 4
1ku List Price: Starting From $2.66

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
LTC3225EDDB#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3225EDDB#TRPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3225EDDB-1#TRMPBF	10-Lead DFN (3mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3225EDDB-1#TRPBF	10-Lead DFN (3mm x 2mm 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
Charge Pumps 1
LTC3226	RECOMMENDED FOR NEW DESIGNS	2-Cell Supercapacitor Charger with Backup PowerPath Controller
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
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

LTC3225 / LTC4412 / LTC4616 Demo Circuit - 5V Supercapacitor Back-Up Supply (5V to 1.8V & 1.2V)

Models for the following parts are available in LTspice:

LTC3225
LTC3225-1

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.