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LTC1147LCS8-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1147LCS8-3.3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC1147-3.3 LTC1147-5/LTC1147L sn1147 1147fds High Efficiency Step-Down Switching Regulator Controllers Figure 1. High Efficiency Step-Down Converter APPLICATI TYPICAL , LTC and LT are registered trademarks of Linear Technology Corporation. 0V = NORMAL >1.5V = SHUTDOWN P-CHANNEL Si4431DY + 1 µF L* 50 µH RSENSE** 0.05 Ω VOUT 5V/2A + CIN 100 µF VIN (5.2V TO 14V) ITH CT CT 470pF CC 3300pF RC 1k + COUT 390 µF D1 MBRD330 LT1147 • F01 GND VIN PDRIVE LTC1147-5 SHDN SENSE+ SENSE– 1000pF COILTRONICS CTX50-2-MP KRL SL-1-C1-0R050J * ** LOAD CURRENT (A) 0.001 70 90 95 100 0.01 0.1 1 LT1147 • TA01 85 80 75 VIN = 6V VIN = 10V LTC1147-5 Efficiency s Very High Efficiency: Over 95% Possible s Wide VIN Range: 3.5V* to 16V 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 Short-Circuit Protection s Very Low Dropout Operation: 100% Duty Cycle s High Efficiency in a Small Amount of Board Space s Output Can Be Externally Held High in Shutdown s Available in 8-Pin SO Package The LTC ®1147 series are step-down switching regulator controllers featuring automatic Burst Mode TM operation to maintain high efficiencies at low output currents. These devices drive an external P-channel power MOSFET at switching frequencies exceeding 400kHz using a constant off-time current mode architecture 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 14V (16V 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 LTC1147 series incorporates automatic power saving Burst Mode operation to reduce switching losses when load currents drop below the level required for continuous operation. 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 applications where even higher efficiency is required, refer to the LTC1148 data sheet and Application Note 54. Burst Mode is a trademark of Linear Technology Corporation. *LTC1147L and LTC1147L-3.3 only. FEATURES DESCRIPTIO APPLICATIO S s Notebook and Palmtop Computers s Portable Instruments s Battery-Operated Digital Devices s Cellular Telephones s DC Power Distribution Systems s GPS Systems |
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