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LTC3870 Datasheet(PDF) 11 Page - Linear Technology |
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LTC3870 Datasheet(HTML) 11 Page - Linear Technology |
11 / 22 page LTC3870 11 3870fa For more information www.linear.com/LTC3870 operaTion LTC3880 0° 180° LTC3880 0° 180° LTC3870 180° 0° LTC3870 120° 240° PHASMD = GND 2 + 2 1 + 3 6 PHASE OPERATION 4 PHASE OPERATION PHASMD = 2/3 INTVCC OR FLOAT CH0 CH1 CH0 CH1 CH0 CH1 CH0 CH1 LTC3880 0° 180° LTC3870 90° 270° PHASMD = INTVCC CH0 CH1 CH0 CH1 LTC3870 60° 300° LTC3880 0° 180° PHASMD = 1/3 INTVCC PHASMD = 2/3 INTVCC CH0 CH1 CH0 CH1 LTC3870 120° 240° CH0 CH1 3870 F01 Frequency Selection and Phase-Locked Loop (FREQ and SYNC Pins) Theselectionofswitchingfrequencyisatrade-offbetween efficiency and component size. Low frequency operation increasesefficiencybyreducingMOSFETswitchinglosses, butrequireslargerinductanceand/orcapacitancetomain- tain low output ripple voltage. The switching frequency of the LTC3870 controllers can be synchronized to the falling edge of the external clock on the SYNC pin or selected us- ing the FREQ pin. A phase-locked loop (PLL) is integrated in the LTC3870 to synchronize the internal oscillator to an external clock source that is connected to the SYNC pin; this source is normally provided by the master control- lers. The PLL loop filter network is integrated inside the Figure 1. Examples of Single/Dual Output Multiphase Converters LTC3870. The phase-locked loop is capable of locking to any frequency within the range of 100kHz to 1MHz. If the SYNC pin is not being driven by an external clock source,theFREQpincanbeusedtoprogramtheLTC3870’s operating frequency from 100kHz to 1MHz. There is a precision 10µA current flowing out of the FREQ pin, so the user can program the controller’s switching frequency with a single resistor to SGND. A curve is provided later in the application section showing the relationship between the voltage on the FREQ pin and switching frequency. The frequency setting resistor should always be present to set the controller’s initial switching frequency before locking to the external clock. |
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