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L6997S 데이터시트(PDF) 1 Page - STMicroelectronics |
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L6997S 데이터시트(HTML) 1 Page - STMicroelectronics |
1 / 30 page 1/30 L6997S June 2004 1 Features ■ FROM 3V TO 5.5V VCC RANGE ■ MINIMUM OUTPUT VOLTAGE AS LOW AS 0.6V ■ 1V TO 35V INPUT VOLTAGE RANGE ■ CONSTANT ON TIME TOPOLOGY ■ VERY FAST LOAD TRANSIENTS ■ 0.6V, ±1% VREF ■ SELECTABLE SINKING MODE ■ LOSSLESS CURRENT LIMIT, AVAILABLE ALSO IN SINKING MODE ■ REMOTE SENSING ■ OVP,UVP LATCHED PROTECTIONS ■ 600 µA TYP QUIESCENT CURRENT ■ POWER GOOD AND OVP SIGNALS ■ PULSE SKIPPING AT LIGTH LOADS ■ 94% EFFICIENCY FROM 3.3V TO 2.5V 2 Applications ■ NETWORKING ■ DC/DC MODULES ■ DISTRIBUTED POWER ■ MOBILE APPLICATIONS ■ CHIP SET, CPU, DSP AND MEMORIES SUPPLY 3 Description The device is a high efficient solution for networking dc/dc modules and mobile applications compatible with 3.3V bus and 5V bus. It's able to regulate an output voltage as low as 0.6V. The constant on time topology assures fast load tran- sient response. The embedded voltage feed-forward provides nearly constant switching frequency opera- tion in spite of a wide input voltage range. An integrator can be introduced in the control loop to reduce the static output voltage error. The remote sensing improves the static and dynamic regulation, recovering the wires voltage drop. Pulse skipping technique reduces power consump- tion at light loads. Drivers current capability allows output currents in excess of 20A. STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS Figure 2. Minimum Component Count Application L6997S SHDN 3.3V INT VSENSE OVP Vref GND GNDSENSE VFB SS OSC 0.6V PGOOD PGND LGATE PHASE HGATE ILIM BOOT Rilim Css Cvref HS LS Rin1 Rin2 Cin Cboot Dboot L Cout Ro1 Ro2 DS REV. 1 Figure 1. Package Table 1. Order Codes Part Number Package L6997S TSSOP20 L6997STR Tape & Reel TSSOP20 |
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