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LTC3733 Datasheet(PDF) 19 Page - Linear Technology

Part # LTC3733
Description  3-Phase, Buck Controllers for AMD CPUs
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3733 Datasheet(HTML) 19 Page - Linear Technology

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LTC3733/LTC3733-1
3733f
Output Voltage
The IC includes a digitally controlled 5-bit attenuator
producing output voltages as defined in Table 1. Output
voltages with 25mV increments are produced from 0.8V to
1.55V.
Each VID digital input is pulled up to a logical high with an
internal 150k resistor. The input logic threshold is ap-
proximately 1.2V but the input circuit can withstand an
input voltage of up to 7V.
ON/OFF Control
The RUN pin provides simple ON/OFF control for the
LTC3733. Driving the RUN pin above 1.5V permits the
controller to start operating. Pulling RUN below 0.8V puts
the LTC3733 into low current shutdown (IQ ≈ 20µA).
Soft-Start Function
The SS pin provides two functions: 1) soft-start and 2) a
defeatable short-circuit latch off timer. Soft-start reduces
the input power sources’ surge currents by gradually
increasing the controller’s current limit (proportional to an
internal buffered and clamped VITH). The latchoff timer
prevents very short, extreme load transients from tripping
the overcurrent latch. A small pull-up current (>5
µA)
supplied to the SS pin will prevent the overcurrent latch
from operating. The following explanation describes how
this function operates.
An internal 1.5
µA current source charges up the CSS
capacitor. As the voltage on SS increases from 0V to 2.4V,
the internal current limit is increased from 0V/RSENSE to
75mV/RSENSE. The output current limit ramps up slowly,
taking 1.6s/
µF to reach full current. The output current
thus ramps up slowly, eliminating the starting surge
current required from the input power supply.
t
VV
A
Cs F C
IRAMP
SS
SS
=
µ
=µ
()
24
0
15
16
.–
.
./
The SS pin has an internal 6V zener clamp (see the
Functional Diagram).
APPLICATIO S I FOR ATIO
Table 1. VID Output Voltage Programming
VID4
VID3
VID2
VID1
VID0
VOUT
0
0
0
0
0
1.550
0
0
0
0
1
1.525
0
0
0
1
0
1.500
0
0
0
1
1
1.475
0
0
1
0
0
1.450
0
0
1
0
1
1.425
0
0
1
1
0
1.400
0
0
1
1
1
1.375
0
1
0
0
0
1.350
0
1
0
0
1
1.325
0
1
0
1
0
1.300
0
1
0
1
1
1.275
0
1
1
0
0
1.250
0
1
1
0
1
1.225
0
1
1
1
0
1.200
0
1
1
1
1
1.175
1
0
0
0
0
1.150
1
0
0
0
1
1.125
1
0
0
1
0
1.100
1
0
0
1
1
1.075
1
0
1
0
0
1.050
1
0
1
0
1
1.025
1
0
1
1
0
1.000
1
0
1
1
1
0.975
1
1
0
0
0
0.950
1
1
0
0
1
0.925
1
1
0
1
0
0.900
1
1
0
1
1
0.875
1
1
1
0
0
0.850
1
1
1
0
1
0.825
1
1
1
1
0
0.800
1
1
1
1
1
Shutdown



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