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LTC1148-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1148-3.3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1148 LTC1148-3.3/LTC1148-5 High Efficiency Synchronous Step-Down Switching Regulators LOAD CURRENT (A) 0.02 80 85 90 100 0.2 2 LTC1148 • TA01 95 VIN = 6V VIN = 10V LTC1148-5 Efficiency S FEATURE DESCRIPTIO s Ultrahigh Efficiency: Over 95% Possible s Current-Mode Operation for Excellent Line and Load Transient Response s High Efficiency Maintained Over Three Decades of Output Current s Low 160 µA Standby Current at Light Loads s Logic Controlled Micropower Shutdown: IQ < 20µA s Wide VIN Range: 3.5V* to 20V 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 Output Can Be Externally Held High in Shutdown s Available in 14-Pin Narrow SO Package The LTC ®1148 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 architec- ture providing constant ripple current in the inductor. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V* to 18V (20V maximum). Constant off-time architecture provides low dropout regu- lation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor. The LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Modeoperation, which reduces switching losses. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA. For operation up to 48V input, see the LTC1149 and LTC1159 data sheets and Application Note 54. Figure 1. High Efficiency Step-Down Converter APPLICATI TYPICAL , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. * LTC1148L and LTC1148L-3.3 only. S APPLICATI s Notebook and Palmtop Computers s Portable Instruments s Battery-Operated Digital Devices s Cellular Telephones s DC Power Distribution Systems s GPS Systems 0V = NORMAL >1.5V = SHUTDOWN P-CHANNEL Si4431DY + 1 µF L* 62 µH RSENSE** 0.05 Ω VOUT 5V/2A + CIN 100 µF VIN (5.2V TO 18V) ITH CT SGND CT 470pF CC 3300pF RC 1k + COUT 390 µF D1 MBRS140T3 LT1148 • TA01 N-DRIVE PGND N-CHANNEL Si4412DY VIN P-DRIVE LTC1148HV-5 SHUTDOWN SENSE+ SENSE– 1000pF COILTRONICS CTX62-2-MP KRL SL-1-C1-0R050J * ** |
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