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LTC3874 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC3874
Description  PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3874 Datasheet(HTML) 11 Page - Linear Technology

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LTC3874
11
3874f
For more information www.linear.com/LTC3874
Figure 1. Multiphase Operation
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 LTC3874 controllers can be selected using the FREQ
pin. If the SYNC pin is not being driven by an external clock
source, the FREQ pin can be used to program the control-
ler’s operating frequency from 250kHz to 1MHz. There is a
precision 10µA current flowing out of the FREQ pin, so the
usercanprogramthecontroller’sswitchingfrequencywith
a single resistor to GND. A curve is provided later in the
application section showing the relationship between the
voltage on the FREQ pin and switching frequency (Figure
5). A phase-locked loop (PLL) is integrated in the LTC3874
to synchronize the internal oscillator to an external clock
source on the SYNC pin. The PLL loop filter network is
integrated inside the LTC3874. The phase-locked loop is
capable of locking to any frequency within the range of
250kHz to 1MHz. The frequency setting resistor should
always be present to set the controller’s initial switching
frequency before locking to the external clock.
LTC3874
240°
120°
LTC3866
3 PHASE OPERATION
6 PHASE OPERATION
4 PHASE OPERATION
CH0
CH1
LTC3874
90°
270°
PHASMD = GND
PHASMD = FLOAT
CH1
CH2
CH0
CH1
LTC3874
120°
300°
LTC3875
240°
PHASMD = GND
PHASMD = INTVCC
PHASMD = 2/3 INTVCC
CH1
CH2
CH0
CH1
LTC3874
SYNC
CLKOUT
CLKOUT
SYNC
SYNC
CLKOUT
SYNC
60°
180°
CH0
CH1
3874 F01
PHASMD = 1/3 INTVCC
LTC3875
180°
OPERATION


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