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LTC3880-1 Datasheet(PDF) 10 Page - Linear Technology |
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LTC3880-1 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTC3870-1 10 38701f For more information www.linear.com/LTC3870-1 operaTion LTC3887-1 0° 180° LTC3887-1 0° 180° LTC3870-1 180° 0° LTC3870-1 120° 240° PHASMD = GND 2 + 2 OPERATION 1 + 3 OPERATION 6 PHASE OPERATION 4 PHASE OPERATION PHASMD = 2/3 INTVCC OR FLOAT CH0 CH1 CH0 CH1 CH0 CH1 CH0 CH1 LTC3887-1 0° 180° LTC3870-1 90° 270° PHASMD = INTVCC CH0 CH1 CH0 CH1 LTC3870-1 60° 300° LTC3887-1 0° 180° PHASMD = 1/3 INTVCC PHASMD = 2/3 INTVCC CH0 CH1 CH0 CH1 LTC3870-1 120° 240° CH0 CH1 38701 F01 Frequency Selection and Phase-Locked Loop (FREQ and SYNC Pins) Theselectionofswitchingfrequencyisatrade-offbetween efficiency and component size. Low frequency opera- tion increases efficiency by reducing MOSFET switching losses, but requires larger inductance and/or capacitance to maintain low output ripple voltage. The switching fre- quency of the LTC3870-1 controllers can be synchronized to the falling edge of the external clock on the SYNC pin or selected using the FREQ pin. A phase-locked loop (PLL) is integrated in the LTC3870-1 to synchronize the internal oscillator to an external clock source that is con- nected to the SYNC pin; this source is normally provided by the master controllers. The PLL loop filter network is Figure 1. Examples of Single/Dual Output Multiphase Converters integrated inside the LTC3870-1. 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, the FREQ pin can be used to program the LTC3870-1’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 pro- vided later in the application section showing the relation- ship between the voltage on the FREQ pin and switching frequency.Thefrequencysettingresistorshouldalwaysbe present to set the controller’s initial switching frequency before locking to the external clock. |
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