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LTC3884 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC3884
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

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LTC3874-1
11
38741f
For more information www.linear/LTC3874-1
applicaTions inForMaTion
Current Limit Programming
To match the master controller current limit, each channel
of the LTC3874-1 can be programmed separately with
the ILIM and LOWDCR pins. The 4-level logic input pin
ILIM setup summary is shown in Table 2. When ILIM is
grounded, both channels are set to be low current range.
When ILIM is tied to INTVCC, both channels are set to be
high current range.
Which setting should be used? For balanced load current
sharing, use the same current range setting as in the
master controller. Note, the LTC3874-1 does not have
active clamping circuit on ITH pin for peak current limit
and over current protection. Over current protection relies
on the master controller to drive the ITH pin not to exceed
the clamped voltage. The relationship between the current
sense threshold and ITH voltage can be found in Table 3.
Table 2. ILIM vs Range
ILIM
CHANNEL 0
CURRENT LIMIT
CHANNEL 1
CURRENT LIMIT
GND
Range Low
Range Low
1/3 INTVCC
Range High
Range Low
2/3 INTVCC or Float
Range Low
Range High
INTVcc
Range High
Range High
Table 3. Current Sense Threshold vs ITH Voltage
ITH (V)
CURRENT SENSE THRESHOLD (mV)
LOWDCR = H
LOWDCR = L
RANGE = H
RANGE = L
RANGE = H
RANGE = L
2.40
32.5
18.1
81.3
45.1
2.33
31.4
17.4
78.4
43.6
2.26
30.2
16.8
75.6
42.0
2.20
29.1
16.2
72.7
40.4
2.18
28.8
16.0
72.0
40.0
2.13
28.0
15.5
69.9
38.8
2.06
26.8
14.9
67.1
37.3
1.99
25.7
14.3
64.2
35.7
1.92
24.6
13.6
61.4
34.1
1.85
23.4
13.0
58.5
32.5
1.79
22.3
12.4
55.7
30.9
1.72
21.1
11.7
52.8
29.4
1.68
20.4
11.3
51.0
28.4
Table 3. Current Sense Threshold vs ITH Voltage (continued)
ITH (V)
CURRENT SENSE THRESHOLD (mV)
LOWDCR = H
LOWDCR = L
RANGE = H
RANGE = L
RANGE = H
RANGE = L
1.58
18.9
10.5
47.2
26.2
1.51
17.7
9.9
44.3
24.6
1.45
16.6
9.2
41.5
23.0
1.38
15.5
8.6
38.6
21.4
ISENSE+ and ISENSE− Pins
ISENSE+ and ISENSE– are the inputs to the current com-
parators. When the LOWDCR pin is high, their common
mode input voltage range is 0V to 3.5V. ISENSE– should
be connected directly to VOUT of the master controller.
ISENSE+ is connected to an R • C filter with time constant
one-fifth of L/DCR of the output inductor. Care must be
taken not to float these pins during normal operation. Filter
components, especially capacitors, must be placed close
to the LTC3874-1, and the sense lines should run close
together to a Kelvin connection underneath the current
senseelement.TheLTC3874-1isdesignedtobeusedwith
a sub-milliohm DCR value; without proper care, parasitic
resistance, capacitance and inductance will degrade the
current sense signal integrity, making the programmed
current limit unpredictable. In Figure 2, resistor R must be
placedclosetotheoutputinductorandcapacitorCcloseto
the IC pins to prevent noise coupling to the sense signal.
The LTC3874-1 can also be used like any conventional
current mode controller by disabling the LOWDCR pin,
connecting it to ground. An RC filter can be used to sense
the output inductor signal and connects to the ISENSE+
pin. Its time constant, R • C, should equal to L/DCR of
the output inductor. By pulling down the LOWDCR pin,
the current limit increases by 2.5 times. See Table 3 for
details. In these applications, the common mode operat-
ing voltage range of ISENSE+, ISENSE– is from 0V to 5.5V.
Table 4. Output Voltage Range vs LOWDCR Pin
LOWDCR
OUTPUT VOLTAGE
Low
0V to 5.5V
High
0V to 3.5V


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