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LTC3870 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3870 Datasheet(HTML) 6 Page - Linear Technology |
6 / 22 page LTC3870 6 3870fa For more information www.linear.com/LTC3870 pin FuncTions MODE0/MODE1 (Pin 1/Pin 8): DCM/CCM Mode Control Pins. Channel0/Channel1 operates in forced continuous mode if MODE0/MODE1 pin is logic high. There is a 500 kΩ pull down resistor on MODE0/MODE1 internally. The default operation mode in each channel is discontinuous mode operation unless these pins are actively driven high. ISENSE0+/ISENSE1+(Pin2/Pin7):CurrentSenseComparator positive inputs, normally connected to the positive node of the DCR sensing networks or current sensing resistors. ISENSE0−/ISENSE1−(Pin3/Pin6):CurrentSenseComparator negative inputs, normally connected to the negative node of the DCR sensing network or current sensing resistors. RUN0/RUN1 (Pin 4/Pin 5): Enable RUN Input Pins. Logic high on these pins enables the corresponding channel. In multiphase operation, these pins are connected to LTC3880/LTC3883 RUN pins. ITH0/ITH1 (Pin 28/Pin 9): Current Control Threshold. Each associatedchannel’scurrentcomparatortrippingthreshold increases with its ITH voltage. In multiphase operation, these pins are connected to the master controller’s ITH pins for current sharing. ILIM (Pin 10): Program Current Comparators’ Sense Voltage Range. This pin can be tied to SGND or INTVCC to select the maximum current sense threshold for each currentcomparator.SGNDsetsbothchannels’currentlow range with maximum 50mV sensing voltage. INTVCC sets both channels’ current high range with maximum 75mV sensing voltage. For equal current sharing, the setup on the ILIM pin has to be same as the setup on the bit 7 of MFR_PWM_MODE_3880/3883 register in the master controller. See Table 2 in the Operation Section for details. SYNC (Pin 11): External Clock Synchronization Input. If an external clock is present at this pin, the switching frequency will be synchronized to the falling edge of the external clock. In multiphase operation, this pin is con- nected to LTC3880/LTC3883 the SYNC pin for frequency synchronization. Do not float the SYNC pin. PHASMD (Pin 12): Phase Set Pin. This pin can be tied to SGND, INTVCC or a resistor divider from INTVCC to SGND. This pin determines the relative phases between the ext- ernal clock on the SYNC pin and the internal controllers. See Table 1 in the Operation Section for details. TG0/TG1 (Pin 24/Pin 13): Top Gate Driver Outputs. These are the outputs of floating drivers with a voltage swing equaltoINTVCCsuperimposedontheswitchnodevoltages. SW0/SW1 (Pin 23/Pin 14): Switch Node Connections to Inductors. Voltage swings at the pins are from a Schottky diode (external) voltage drop below ground to VIN. BOOST0/BOOST1(Pin22/Pin15):BoostedFloatingDriver Supplies.The(+)terminalofthebootstrapcapacitorscon- nect to these pins. These pins swing from a diode voltage drop below INTVCC up to VIN + INTVCC. BG0/BG1 (Pin 21/Pin 16): Bottom Gate Driver Outputs. These pins drive the gates of the bottom N-Channel MOS- FETs between PGND and INTVCC. INTVCC (Pin 17): Internal Regulator 5V Output. The internal control circuits are powered from this voltage. Bypass this pin to PGND with a minimum of 4.7μF low ESR tantalum or ceramic capacitor. INTVCC is enabled as soon as VIN is powered. EXTVCC (Pin 18): External power input to an internal LDO connected to INTVCC. This LDO supplies INTVCC power bypassing the internal LDO powered from VIN whenever EXTVCC is higher than 4.8V. See EXTVCC connection in the Applications Information Section. Do not exceed 14V on this pin. Bypass this pin to PGND with a minimum of 4.7μF low ESR tantalum or ceramic capacitor. If the EXTVCC pin is not used, leave it open or tie it to ground. EXTVCC can be present before VIN. However, EXTVCC is enabled only if VIN is higher than 6.5V. PGND(Pin19):PowerGroundPin.Connectthispinclosely to the sources of the bottom N-Channel MOSFETs and the (–) terminals of CIN. VIN (Pin 20): Main Input Supply. Bypass this pin to PGND with a capacitor (0.1μF to 1μF). |
Similar Part No. - LTC3870_15 |
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Similar Description - LTC3870_15 |
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