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LTC1149 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1149 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1149 LTC1149-3.3/LTC1149-5 S FEATURE DESCRIPTIO s Operation to 48V Input Voltage s Ultrahigh Efficiency: Up to 95% s Current Mode Operation for Excellent Line and Load Transient Response s High Efficiency Maintained over Wide Current Range s Logic-Controlled Micropower Shutdown s Short-Circuit Protection s Very Low Dropout Operation: 100% Duty Cycle s Synchronous FET Switching for High Efficiency s Adaptive Nonoverlap Gate Drives s Available in 16-Pin Narrow SO Package The LTC ®1149 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 comple- mentary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode archi- tecture. Special onboard regulation and level-shift circuitry allow operation at input voltages from dropout to 48V (60V absolute max). The constant off-time architecture main- tains constant ripple current in the inductor, easing the design of wide input range converters. Current mode operation provides excellent line and load transient response. The operating current level is user-program- mable via an external current sense resistor. The LTC1149 series incorporates automatic power saving Burst Mode operation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN = 12V. In shutdown, both MOSFETs are turned off. High Efficiency Synchronous Step-Down Switching Regulators Figure 1. High Efficiency Step-Down Regulator APPLICATI TYPICAL 0.068 µF VIN CAP PDRIVE LTC1149-5 SHDN1 ITH CT SGND PGATE VCC VCC SHDN2 SENSE– SENSE+ P, RGNDS NGATE 1000pF N-CHANNEL IRFR024 0.047 µF 1N4148 1N4148 VIN P-CHANNEL IRFR9024 D1 1N5819 L* 62 µH RSENSE** 0.05 Ω VOUT 5V/2A COUT 220 µF CIN 100 µF 100V 3.3 µF 0V = NORMAL >2V = SHUTDOWN 3300 µF CT 470pF 1k 1149 F01 *COILTRONICS CTX62-2-MP **KRL SL-1-C1-0R050J + + + LOAD CURRENT (A) 0.02 60 70 80 100 0.2 2 1149 TA01 90 VIN = 12V VIN = 24V FIGURE 1 CIRCUIT LTC1149-5 Efficiency 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 , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. |
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