LT1573 - Low Dropout Regulator Driver
Features
- Low Cost Solution for High Current, Low Dropout Regulators
- Fast Transient Response Needs Much Less Bulk Capacitance
- Latching Overload Protection Minimizes Heat Sink Size
- Precision Output Voltage (1%)
- Single Supply Operation: VIN = 2.8V to 10V
- Small Surface Mount Package
- Capable of Very Low Dropout Voltage (<0.2V)
- Fixed or Adjustable Outputs
- Shutdown
Typical Application
Description
The LT1573 is a regulator driver IC designed to provide a low cost solution for applications requiring high current, low dropout and fast transient response. When combined with an external PNP power transistor, this device provides load current up to 5A with dropout voltages as low as 0.35V. The LT1573 circuitry is designed for extremely fast transient response. This greatly reduces bulk storage capacitance when the regulator is used in applications with fast, high current load transients.To keep cost and complexity low, the LT1573 uses a new time-delayed latching overcurrent protection technique that requires no external current sense resistor. Base drive is limited for instantaneous protection, and a time-delayed latch protects the regulator from continuous short circuits.
The LT1573 is available as an adjustable regulator with an output range of 1.27V to 6.8V and with fixed output voltages of 2.5V, 2.8V and 3.3V. Output accuracy is better than 1% to meet the critical regulation requirement of fast microprocessors. A special 8-pin, fused-lead surface mount package is used to minimize regulator footprint and provide adequate heat sinking.
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 |
|---|---|---|---|---|---|
| LT1573CS8-2.5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1573CS8-2.5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1573CS8-2.8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1573CS8-3.3#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1573CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1573CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1573IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1573IS8#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 | |
|---|---|---|---|---|---|---|
| LT1573CS8-2.5#PBF | SO-8 | C | $2.05 | $1.75 | Yes | |
| LT1573CS8-2.5#TRPBF | SO-8 | C | $1.81 | Yes | ||
| LT1573CS8-2.8#PBF | SO-8 | C | $2.05 | $1.75 | Yes | |
| LT1573CS8-3.3#PBF | SO-8 | C | $2.05 | $1.75 | Yes | |
| LT1573CS8#PBF | SO-8 | C | $2.05 | $1.75 | Yes | |
| LT1573CS8#TRPBF | SO-8 | C | $1.81 | Yes | ||
| LT1573IS8#PBF | SO-8 | I | $2.50 | $2.10 | Yes | |
| LT1573IS8#TRPBF | SO-8 | I | $2.16 | 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
- 3.3V to 2.5V Regulator
- Microprocessor Power Source
- Post Regulator for Switching Supplies
- High Efficiency Linear Regulators
- Ultralow Dropout Regulators
- Low Voltage Linear Regulators
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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:
LT1573
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.
