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LTC1142_00 Datasheet(数据表) 1 Page - Linear Technology |
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LTC1142 Datasheet(HTML) 1 Page - Linear Technology |
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1 page 
1 LTC1142/LTC1142L/LTC1142HV Dual High Efficiency Synchronous Step-Down Switching Regulators , LTC and LT are registered trademarks of Linear Technology Corporation. The LTC ®1142/LTC1142L/LTC1142HV are dual synchro- nous step-down switching regulator controllers featuring automatic Burst Mode TM operation to maintain high efficien- cies at low output currents. The devices are composed of two separate regulator blocks, each driving a pair of external complementary power MOSFETs, at switching frequencies up to 250kHz, using a constant off-time current mode archi- tecture providing constant ripple current in the inductor. The operating current level for both regulators is user pro- grammable via an external current sense resistor. Wide input supply range allows operation from 3.5V* to 18V (20V maximum).Constantoff-timearchitectureprovideslowdrop- out regulation limited only by the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor. The LTC1142 series is ideal for applications requiring dual output voltages with high conversion efficiencies over a wide load current range in a small amount of board space. s Dual Outputs: 3.3V and 5V or User Programmable s Ultrahigh Efficiency: Over 95% Possible s Current Mode Operation for Excellent Line and Load Transient Response s High Efficiency Maintained over 3 Decades of Output Current s Low Standby Current at Light Loads: 160 µA/Output s Independent Micropower Shutdown: IQ < 40µA s Wide VIN Range: 3.5V to 20V s Very Low Dropout Operation: 100% Duty Cycle s Synchronous FET Switching for High Efficiency s Available in Standard 28-Pin SSOP s Notebook and Palmtop Computers s Battery-Operated Digital Devices s Portable Instruments s DC Power Distribution Systems Figure 1. High Efficiency Dual 3.3V, 5V Supply 1000pF + + + 1000pF PDRIVE 3 SENSE+ 3 SENSE– 3 NDRIVE 3 PGND3 SGND3 CT3 ITH3 ITH5 CT5 SGND5 PGND5 NDRIVE 5 SENSE– 5 SENSE+ 5 PDRIVE 5 VIN3 SHDN3 SHDN5 VIN5 LTC1142HV CT5 390pF 4 3 25 27 13 11 17 18 RC5 1k CC3 3300pF CC5 3300pF CT3 560pF RC3 1k 0.22 µF 2 24 16 10 9 15 14 20 23 1 28 6 VOUT5 5V/2A COUT5 220 µF 10V × 2 RSENSE5 0.05 Ω P-CH Si9430DY L2 50 µH D2 MBRS130L N-CH Si9410DY 0V = NORMAL >1.5V = SHDN 0.22 µF CIN5 22 µF 25V × 2 CIN3 22 µF 25V × 2 P-CH Si9430DY N-CH Si9410DY D1 MBRS130L COUT3 220 µF 10V × 2 L1 50 µH RSENSE3 0.05 Ω VOUT3 3.3V/2A VIN 5.2V TO 18V RSENSE3, RSENSE5 : DALE WSL-2010-.05 L1, L2: COILTRONICS CTX50-2-MP PINS 5, 7, 8, 19, 21, 22: NC 1142 F01 NOTE: COMPONENTS OPTIMIZED FOR HIGHEST EFFICIENCY, NOT MINIMUM BOARD SPACE. + APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO Burst Mode is a trademark of Linear Technology Corporation. |
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