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LTC1159CG-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1159CG-3.3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1159/LTC1159-3.3/LTC1159-5 S FEATURE DESCRIPTIO s Operation from 4V to 40V Input Voltage s Ultra-High Efficiency: Up to 95% s 20 µA Supply Current in Shutdown s High Efficiency Maintained Over Wide Current Range s Current Mode Operation for Excellent Line and Load Transient Response s Very Low Dropout Operation: 100% Duty Cycle s Short-Circuit Protection s Synchronous FET Switching for High Efficiency s Adaptive Non-Overlap Gate Drives s Available in SSOP and SO Packages The LTC ®1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst Mode TM operation to maintain high efficiencies at low output currents. These devices drive external complemen- tary 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 cur- rent in the inductor and provides excellent line and load transient response. The output current level is user pro- grammable 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 300 µA while still regulating the output and shut- down current is a low 20 µA. High Efficiency Synchronous Step-Down Switching Regulators s Step-Down and Inverting Regulators s Notebook and Palmtop Computers s Portable Instruments s Battery-Operated Digital Devices s Industrial Power Distribution s Avionics Systems s Telecom Power Supplies S APPLICATI Figure 1. High Efficiency Step-Down Regulator LOAD CURRENT (A) 0.02 60 70 80 100 0.2 2 LTC1159 • TA01 90 VIN = 10V VIN = 20V FIGURE 1 CIRCUIT LTC1159-5 Efficiency 0.15 µF VIN CAP P-DRIVE EXTVCC LTC1159-5 SHDN1 ITH CT S-GND P-GATE VCC VCC SHDN2 SENSE– SENSE+ P-GND N-GATE 0.01 µF Si9410DY 0.1 µF 1N4148 VIN Si9435DY D1 MBRS140T3 L* 33 µH RSENSE 0.05 Ω VOUT 5V/2A + COUT 220 µF + CIN 100 µF 100V + 3.3 µF 0V = NORMAL >2V = SHUTDOWN 3300pF CT 300pF 1k LTC1159 • F01 *COILTRONICS CTX33-4-MP APPLICATI TYPICAL Burst Mode is a trademark of Linear Technology Corporation. , LTC and LT are registered trademarks of Linear Technology Corporation. |
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