LTC1559 - Backup Battery Controller with Fixed Output
Features
- Not Recommended For New Designs. Contact Linear Technology for Potential Replacement.
- Complete Battery Backup System in an SO-8,
16-Pin GN or SO Package - Generates Fixed Backup Voltage (3.07V/4.63V) from
a Single 1.2V NiCd Button Cell - Automatic Main Supply to Backup Switching
- Minimum 100mW Output Power
- Automatic Fast Recharge of NiCd Battery
- Programmable NiCd Trickle Charge Current
- Smart NiCd Charger Minimizes Recharge Time and
Maximizes System Efficiency After Backup - Onboard Power-Up and Push-Button Reset
Generator - Performs VCC Supervisory Functions
- Reset Assertion Guaranteed at VCC = 1V
- Short-Circuit Protection
- Thermal Limiting
Typical Application
Description
NOT RECOMMENDED FOR NEW DESIGNS
Contact Linear Technology for Potential Replacement
The LTC®1559 is a backup battery controller that provides all the functions necessary to implement a backup 3.3V or 5V power supply using a single NiCd cell. It includes a 1.2V to 3.07V/4.63V boost converter, an intelligent 2-stage battery charger, automatic backup switching and a microprocessor reset generator. The boost converter uses a synchronous switching architecture to achieve a typical efficiency of 70%, ensuring maximum backup lifetime from a small NiCd cell. The on-chip NiCd charger uses an internal gas gauge to minimize fast recharge time and prevent overcharging of the backup cell, thereby improving system efficiency and extending the life of the backup cell. The LTC1559 also provides a user programmable trickle charge current to compensate for self-discharge losses in the backup cell. The LTC1559’s automatic backup switching scheme requires minimum intervention from the host system and provides feedback to the host to minimize system loading in the backup state. Its internal VCC fault detector and reset generator eliminate the need for a separate microprocessor supervisory chip in most applications. The LTC1559 is available in an SO-8, 16-pin GN or SO package.
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 |
|---|---|---|---|---|---|
| LTC1559CGN-3.3#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1559CGN-3.3#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1559CGN-5#PBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1559CGN-5#TRPBF | SSOP-16 | GN | C | 05-08-1641 (GN16) | Yes |
| LTC1559CS-3.3#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1559CS-3.3#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1559CS-5#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1559CS-5#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1559CS8-3.3#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1559CS8-3.3#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1559CS8-5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1559CS8-5#TRPBF | SO-8 | S8 | C | 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 | |
|---|---|---|---|---|---|---|
| LTC1559CGN-3.3#PBF | SSOP-16 | C | $3.15 | $2.60 | Yes | |
| LTC1559CGN-3.3#TRPBF | SSOP-16 | C | $2.66 | Yes | ||
| LTC1559CGN-5#PBF | SSOP-16 | C | $3.15 | $2.60 | Yes | |
| LTC1559CGN-5#TRPBF | SSOP-16 | C | $2.66 | Yes | ||
| LTC1559CS-3.3#PBF | SO-16 | C | $2.95 | $2.50 | Yes | |
| LTC1559CS-3.3#TRPBF | SO-16 | C | $2.56 | Yes | ||
| LTC1559CS-5#PBF | SO-16 | C | $2.95 | $2.50 | Yes | |
| LTC1559CS-5#TRPBF | SO-16 | C | $2.56 | Yes | ||
| LTC1559CS8-3.3#PBF | SO-8 | C | $2.85 | $2.40 | Yes | |
| LTC1559CS8-3.3#TRPBF | SO-8 | C | $2.46 | Yes | ||
| LTC1559CS8-5#PBF | SO-8 | C | $2.85 | $2.40 | Yes | |
| LTC1559CS8-5#TRPBF | SO-8 | C | $2.46 | 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC208A-A | LTC1559CS8-3.3 | SINGLE CELL BACKUP SUPPLY, 3.3V @ 3A Vout (Normal) and 3.3V @ 30mA Vout (Backup) | Contact Factory | |
| DC208A-B | LTC1559CS8-5 | SINGLE CELL BACKUP SUPPLY, 5V @ 3A Vout (Normal) and 5V @ 20mA Vout (Backup) | Contact Factory | |
| Buy Now | |||
Applications
- Notebook Computers
- Palmtop Computers/PDAs
- Portable Instruments
- Battery-Powered Systems
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