LTC1159 - High Efficiency Synchronous Step-Down Switching Regulators
Features
- Operation from 4V to 40V Input Voltage
- 20µA Supply Current in Shutdown
- High Efficiency Maintained Over Wide Current Range
- Current Mode Operation for Excellent Line and Load Transient Response
- Very Low Dropout Operation: 100% Duty Cycle
- Short-Circuit Protection
- Synchronous FET Switching for High Efficiency
- Adaptive Non-Overlap Gate Drives
- Ultrahigh Efficiency: Up to 95%
- Available in SSOP and SO Packages
Typical Application
Description
The LTC®1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst ModeTM operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor.
The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300µA while still regulating the output and shutdown current is a low 20µA.
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 |
|---|---|---|---|---|---|
| LTC1159CG-3.3#PBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1159CG-3.3#TRPBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1159CG-5#PBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1159CG-5#TRPBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1159CG#PBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1159CG#TRPBF | SSOP-20 | G | C | 05-08-1640 (G20) | Yes |
| LTC1159CS-3.3#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1159CS-3.3#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1159CS-5#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1159CS-5#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1159CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1159CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1159IS-3.3#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1159IS-3.3#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1159IS-5#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1159IS-5#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1159IS#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1159IS#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1159CG-3.3#PBF | SSOP-20 | C | $6.65 | $5.35 | Yes | |
| LTC1159CG-3.3#TRPBF | SSOP-20 | C | $5.45 | Yes | ||
| LTC1159CG-5#PBF | SSOP-20 | C | $6.65 | $5.35 | Yes | |
| LTC1159CG-5#TRPBF | SSOP-20 | C | $5.45 | Yes | ||
| LTC1159CG#PBF | SSOP-20 | C | $6.65 | $5.35 | Yes | |
| LTC1159CG#TRPBF | SSOP-20 | C | $5.45 | Yes | ||
| LTC1159CS-3.3#PBF | SO-16 | C | $6.00 | $4.80 | Yes | |
| LTC1159CS-3.3#TRPBF | SO-16 | C | $4.86 | Yes | ||
| LTC1159CS-5#PBF | SO-16 | C | $6.00 | $4.80 | Yes | |
| LTC1159CS-5#TRPBF | SO-16 | C | $4.86 | Yes | ||
| LTC1159CS#PBF | SO-16 | C | $6.00 | $4.80 | Yes | |
| LTC1159CS#TRPBF | SO-16 | C | $4.86 | Yes | ||
| LTC1159IS-3.3#PBF | SO-16 | I | $6.80 | $5.75 | Yes | |
| LTC1159IS-3.3#TRPBF | SO-16 | I | $5.81 | Yes | ||
| LTC1159IS-5#PBF | SO-16 | I | $6.80 | $5.75 | Yes | |
| LTC1159IS-5#TRPBF | SO-16 | I | $5.81 | Yes | ||
| LTC1159IS#PBF | SO-16 | I | $6.80 | $5.75 | Yes | |
| LTC1159IS#TRPBF | SO-16 | I | $5.81 | 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 |
|---|---|---|---|
| DC057A-A | LTC1159CS | HIGH EFFICIENCY SYNCHRONOUS SWITCHER (3.3V ADJ.@1A) | Contact Factory | |
| DC057A-B | LTC1159CS | High Efficiency Synchronous Switcher (3.3V @ 2.5) | Contact Factory | |
| DC057A-C | LTC1159CS-5 | High Efficiency Synchronous Switcher (5V @ 2A) | Contact Factory | |
| Buy Now | |||
Applications
- Step-Down and Inverting Regulators
- Notebook and Palmtop Computers
- Portable Instruments
- Battery-Operated Digital Devices
- Industrial Power Distribution
- Avionics Systems
- Telecom Power Supplies
People Who Viewed This Product Also Viewed
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LTC1149 - High Efficiency Synchronous Step-Down Switching Regulators
- LTC3789 - High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
- LT3083 - Adjustable 3A Single Resistor Low Dropout Regulator
- LT3791 - 60V 4-Switch Synchronous Buck-Boost LED Driver Controller
- LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
- LTC1624 - High Efficiency SO-8 N-Channel Switching Regulator Controller
- LT8610 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
- LT3652 - Power Tracking 2A Battery Charger for Solar Power
- LT1763 - 500mA, Low Noise, LDO Micropower Regulators
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
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:
LTC1159
LTC1159-3.3
LTC1159-5
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.
