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L6997D Scheda tecnica(PDF) 1 Page - STMicroelectronics |
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L6997D Scheda tecnica(HTML) 1 Page - STMicroelectronics |
1 / 23 page 1/23 L6997 April 2003 FEATURES s FROM 3V TO 5.5V VCC RANGE. s MINIMUM OUTPUT VOLTAGE AS LOW AS 0.6V. s 1V TO 28V INPUT VOLTAGE RANGE. s CONSTANT ON TIME TOPOLOGY ALLOWS. OPERATION WITH VERYLOW AND HIGH DUTY CYCLES. s VERY FAST LOAD TRANSIENTS. s 0.6V, ±1% VREF. s SELECTABLE SINKING MODE. s LOSSLESS CURRENT LIMIT, AVAILABLE ALSO IN SINKING MODE s REMOTE SENSING. s OVP,UVP LATCHED PROTECTIONS. s 600 µA TYP QUIESCENT CURRENT. s POWER GOOD AND OVP SIGNALS. s PULSE SKIPPING AT LIGTH LOADS. s 94% EFFICIENCY FROM 3.3V TO 2.5V. APPLICATIONS s NETWORKING. s DC/DC MODULES. s DISTRIBUTED POWER. s MOBILE APPLICATIONS. s CHIP SET, CPU, DSP AND MEMORIES SUPPLY. DESCRIPTION The device is a high efficient solution for networking dc/dc modules and mobile application 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. 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. TSSOP20 ORDERING NUMBERS: L6997D L6997DTR STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS MINIMUM COMPONENT COUNT APPLICATION L6997 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 |
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