Power Management Supercapacitor Chargers

LTC3625 - 1A High Efficiency 2-Cell Supercapacitor Charger with Automatic Cell Balancing

Features

  • 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)
  • VIN = 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
  • IVOUT, IVIN < 1μA in Shutdown
  • Low Profile 12-lead 3mm × 4mm DFN Package

Typical Application

LTC3625 Typical Application
LTC3625 Typical Application

Description

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 VIN 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-12

LTC3625 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3625EDE#PBF DFN 12 E $4.29 $3.00 View
LTC3625EDE#TRPBF DFN 12 E $3.06 View
LTC3625EDE-1#PBF DFN 12 E $4.29 $3.00 View
LTC3625EDE-1#TRPBF DFN 12 E $3.06 View
LTC3625IDE#PBF DFN 12 I $4.93 $3.45 View
LTC3625IDE#TRPBF DFN 12 I $3.51 View
LTC3625IDE-1#PBF DFN 12 I $4.93 $3.45 View
LTC3625IDE-1#TRPBF DFN 12 I $3.51 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1583A-A LTC3625EDE Demo Board u VIN = 2.7V to 5.5V, VOUT= 5.3V / 4.8V @IOUT up to 1A $125.00
DC1583A-B LTC3625-1EDE Demo Board u VIN = 2.7V to 5.5V, VOUT= 4.5V / 4.0V @IOUT up to 1A Contact Factory
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Applications

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

Simulate

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

Related models available in LTspice IV
LTC3625-1
LTC3625

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