LT1620 - Rail-to-Rail Current Sense Amplifier
Features
- Accurate Output Current Programming
- Usable in Charging Applications Up to 32V Output
- Programmable Load Current Monitor for End-of-Charging-Cycle Notification (16-Pin Version)
- Dual Function IC (LT1621) Allows Convenient Integration of Load and Input Current Sensing
- Level-Shifted Current Sense Output for Current Mode PWM Controllers
- Can be Used for NiCd, NiMH, Lead-Acid and Lithium- Ion Battery Charging
- Greater than 96% Efficiency Possible in Charger Applications
- High Output Currents Possible: > 10A Easily Obtained
Typical Application
Description
The LT1620 simplifies the design of high performance, controlled current battery charging circuits when used in conjunction with a current mode PWM controller IC. The LT1620 regulates average output current independent of input and output voltage variations. Output current can be easily adjusted via a programming voltage applied to the LT1620’s PROG pin. Most current mode PWM controllers have limited output voltage range because of common mode limitations on the current sense inputs. The LT1620 overcomes this restriction by providing a level-shifted current sense signal, allowing a 0V to 32V output voltage range. The 16-pin version of the LT1620 contains a programmable low charging current flag output. This output flag can be used to signal when a Li-Ion battery charging cycle is nearing completion. The LT1621 incorporates two fully independent current control circuits for dual loop applications.Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT1620CGN#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LT1620CGN#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LT1620CMS8#PBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LT1620CMS8#TRPBF | MS-8 | MS8 | C | 05-08-1660 | Yes |
| LT1620CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1620CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1620IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1620IGN#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1620IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1620IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1620CGN#PBF | SSOP-16 | C | $3.09 | $2.00 | Yes | |
| LT1620CGN#TRPBF | SSOP-16 | C | $2.06 | Yes | ||
| LT1620CMS8#PBF | MS-8 | C | $3.01 | $1.95 | Yes | |
| LT1620CMS8#TRPBF | MS-8 | C | $2.01 | Yes | ||
| LT1620CS8#PBF | SO-8 | C | $2.57 | $1.80 | Yes | |
| LT1620CS8#TRPBF | SO-8 | C | $1.86 | Yes | ||
| LT1620IGN#PBF | SSOP-16 | I | $3.71 | $2.40 | Yes | |
| LT1620IGN#TRPBF | SSOP-16 | I | $2.46 | Yes | ||
| LT1620IS8#PBF | SO-8 | I | $2.40 | $1.95 | Yes | |
| LT1620IS8#TRPBF | SO-8 | I | $2.01 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about 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.Click here to view our complete list of demo boards
Applications
- High Current Battery Chargers
- High Output Voltage DC/DC Converters
- Constant Current Sources
- Overcurrent Fault Protectors
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LT1620
LT1620S8
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
