LTC4425
RECOMMENDED FOR NEW DESIGNSLinear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor
- Part Models
- 8
- 1ku List Price
- Starting From $3.45
Overview
- 50mΩ Ideal Diode from VIN to VOUT
- Smart Charge Current Profile Limits Inrush Current
- Internal Cell Balancer (No External Resistors)
- Programmable Output Voltage (LDO Mode)
- Programmable VIN to VOUT Current Limit
- Continuous Monitoring of VIN to VOUT Current via PROG Pin
- Low Quiescent Current: 20μA
- VIN 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 VIN in normal mode with a smart charge current profile to limit the inrush current until the VIN to VOUT 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 (VOUT current limit) is programmed by connecting a resistor between PROG and GND. The voltage on the PROG pin represents the current fl owing from VIN to VOUT 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
Documentation
Data Sheet 1
User Guide 1
Design Note 1
Technical Articles 1
Video 1
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) | ||
| LTC4425EDD#TRPBF | 12-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC4425EMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC4425EMSE#TRPBF | 12-Lead MSOP w/ EP | ||
| LTC4425IDD#PBF | 12-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC4425IDD#TRPBF | 12-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC4425IMSE#PBF | 12-Lead MSOP w/ EP | ||
| LTC4425IMSE#TRPBF | 12-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| 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 |
||
| 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
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Charger ICs 1 | ||
|
LTM8052 LTM8052A |
36VIN, 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.
Evaluation Kits
LTC4425EDD Demo Board | Linear SuperCap Charger with Current-Limited Ideal Diode and V/I Monitor