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LTC1143L Datasheet(PDF) 1 Page - Linear Technology |
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LTC1143L Datasheet(HTML) 1 Page - Linear Technology |
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1 / 20 page  1 LTC1143/LTC1143L LTC1143L-ADJ s Dual Outputs LTC1143, LTC1143L: 3.3V, 5V LTC1143L-ADJ: Dual Adjustable s Very High 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 Standby Current at Light Loads: 160 µA/Output s Logic-Controlled Shutdown (LTC1143, LTC1143L) s Wide VIN Range: 3.5V to 16V (LTC1143L, LTC1143L-ADJ) s Very Low Dropout Operation: 100% Duty Cycle s Available in Narrow 16-Pin SO Package The LTC1143 series is a dual step-down switching regulator controller featuring automatic Burst Mode TM operation to maintain high efficiencies at low output currents. This device is composed of two separate regulator blocks, each driving an external power MOSFET at switching frequencies up to 400kHz using a constant off-time current mode architecture. Both fixed and adjustable voltages are available. The operating current level for both regulators is user- programmable via an external current sense resistor. Wide input supply range allows operation from 4V to 14V (16V maximum). The LTC1143L and LTC1143L-ADJ extend operation to VIN = 3.5V. 100% duty cycle provides low dropout regulation limited only by the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor. The LTC1143 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. DESCRIPTION FEATURES Figure 1. High Efficiency Dual 3.3V/2.5V Regulator 1000pF 100pF + + + 1000pF P-DRIVE 1 SENSE+ 1 SENSE– 1 VFB1 VFB2 GND1 CT1 ITH1 ITH2 CT2 GND2 SENSE– 2 SENSE+ 2 P-DRIVE 2 VIN1 VIN2 LTC1143L-ADJ CT2 300pF 3 2 14 15 7 611 RC2 1k CC1 3300pF CC2 3300pF CT1 300pF RC1 1k 0.22 µF 13 5 12 9 8 10 4 1 16 VOUT2 2.5V/2A COUT2 220 µF 10V × 2 RSENSE2 0.05 Ω P1B L2 27 µH D2 MBRS320T3 0.22 µF CIN2 22 µF 25V × 2 CIN1 22 µF 25V × 2 P1A D1 MBRS320T3 COUT1 220 µF 10V × 2 L1 27 µH RSENSE1 0.05 Ω R2 82.5k 1% R1 49.9k 1% VOUT1 3.3V/2A R3 49.9k 1% R4 49.9k 1% VIN 4V TO 14V 1143 F01 + L1, L2: SUMIDA CDRH125-270 P1: SILICONIX Si4953DY/FAIRCHILD NDS8947 RSENSE1, RSENSE2: DALE WSL-2010-.05 100pF Burst Mode is a trademark of Linear Technology Corporation. , LTC and LT are registered trademarks of Linear Technology Corporation. Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers TYPICAL APPLICATION APPLICATIONS s Personal Digital Assistants s Notebook and Palmtop Computers s Battery-Operated Digital Devices s Portable Instruments s DC Power Distribution Systems |
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