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L6995STR Datasheet(PDF) 1 Page - STMicroelectronics |
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L6995STR Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 26 page  1/26 L6995S April 2004 1 FEATURES ■ CONSTANT ON TIME TOPOLOGY ALLOWS OPERATION WITH LOWER DUTY THAN PWM TOPOLOGY ■ VERY FAST LOAD TRANSIENTS ■ 5V Vcc SUPPLY ■ 1.5V TO 35V INPUT VOLTAGE RANGE ■ 0.9V ±1% VREF ■ MINIMUM OUTPUT VOLTAGE AS LOW AS 0.9V ■ SELECTABLE SINKING MODE ■ LOSSLESS CURRENT LIMIT ■ REMOTE SENSING ■ OVP,UVP LATCHED PROTECTIONS ■ 600 µA TYP QUIESCENT CURRENT ■ POWER GOOD AND OVP SIGNALS ■ PULSE SKIPPING AT LIGHT LOADS 2 APPLICATIONS ■ I/O BUS FOR CPU CORE SUPPLY ■ NOTEBOOK COMPUTERS ■ NETWORKING DC-DC ■ DISTRIBUTED POWER 3 DESCRIPTION The device is a step-down controller specifically de- signed to provide extremely high efficiency conver- sion, with losses current sensing tecnique. The "constant on-time" topology assures fast load transient response. The embedded "voltage feed-for- ward" provides nearly constant switching frequency operation. An integrator can be introduced in the control loop to reduce the static output voltage error. The available remote sensing improve the static and dynamic regulation recovering the wires voltage drop. Pulse skipping technique reduces power con- sumption at light load. Drivers current capability al- lows output current in excess of 20A. STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION Figure 2. Minimum Component Count Application SS C C BOOT OUT C 0.9V Vo L6995S 35V Rin2 Rin1 CIN RILIM 5V INT VFB SS OSC BOOT HGATE PHASE LGATE PGND GND NOSKIP ILIM VSENSE VREF 5V VREF C L BOOT D HS LS DS REV. 1 Figure 1. Package Table 1. Order Codes Part Number Package L6995S TSSOP20 L6995STR Tape & Reel TSSOP20 Obsolete Product(s) - Obsolete Product(s) |
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