LTC3734 Datasheet, PDF (18/28 Pages) Linear Technology – Single-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs

LTC3734
APPLICATIO S I FOR ATIO
Table 1. VID Output Voltage Programming
VID5 VID4 VID3 VID2 VID1 VID0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
0
1
1
0
0
0
1
0
0
0
0
0
1
0
1
0
0
0
1
1
0
0
0
0
1
1
1
0
0
1
0
0
0
0
0
1
0
0
1
0
0
1
0
1
0
0
0
1
0
1
1
0
0
1
1
0
0
0
0
1
1
0
1
0
0
1
1
1
0
0
0
1
1
1
1
0
1
0
0
0
0
0
1
0
0
0
1
0
1
0
0
1
0
0
1
0
0
1
1
0
1
0
1
0
0
0
1
0
1
0
1
0
1
0
1
1
0
0
1
0
1
1
1
0
1
1
0
0
0
0
1
1
0
0
1
0
1
1
0
1
0
0
1
1
0
1
1
0
1
1
1
0
0
0
1
1
1
0
1
0
1
1
1
1
0
0
1
1
1
1
1
LTC3734
1.708V
1.692V
1.676V
1.660V
1.644V
1.628V
1.612V
1.596V
1.580V
1.564V
1.548V
1.532V
1.516V
1.500V
1.484V
1.468V
1.452V
1.436V
1.420V
1.404V
1.388V
1.372V
1.356V
1.340V
1.324V
1.308V
1.292V
1.276V
1.260V
1.244V
1.228V
1.212V
VID5 VID4 VID3 VID2 VID1 VID0
1
0
0
0
0
0
1
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
1
1
1
0
0
1
0
0
1
0
0
1
0
1
1
0
0
1
1
0
1
0
0
1
1
1
1
0
1
0
0
0
1
0
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
0
0
1
0
1
1
0
1
1
0
1
1
1
0
1
0
1
1
1
1
1
1
0
0
0
0
1
1
0
0
0
1
1
1
0
0
1
0
1
1
0
0
1
1
1
1
0
1
0
0
1
1
0
1
0
1
1
1
0
1
1
0
1
1
0
1
1
1
1
1
1
0
0
0
1
1
1
0
0
1
1
1
1
0
1
0
1
1
1
0
1
1
1
1
1
1
0
0
1
1
1
1
0
1
1
1
1
1
1
0
1
1
1
1
1
1
LTC3734
1.196V
1.180V
1.164V
1.148V
1.132V
1.116V
1.100V
1.084V
1.068V
1.052V
1.036V
1.020V
1.004V
0.988V
0.972V
0.956V
0.940V
0.924V
0.908V
0.892V
0.876V
0.860V
0.844V
0.828V
0.812V
0.796V
0.780V
0.764V
0.748V
0.732V
0.716V
0.700V
4.2V typically. Only then is the PGOOD pull-low signal
released.
When RUN/SS goes low, PGOOD goes low simultaneously.
Fault Conditions: Overcurrent Latchoff
The RUN/SS pin also provides the ability to latch off the
controller when an overcurrent condition is detected. The
18
RUN/SS capacitor, C_SS, is used initially to limit the inrush
current. After the controller has been started and been
given adequate time to charge up the output capacitors
and provide full load current, the RUN/SS capacitor is used
for a short-circuit timer. If the output voltage falls to less
than 70% of its nominal value after C_SS reaches 4.2V, C_SS
begins discharging on the assumption that the output is in
an overcurrent condition. If the condition lasts for a long
3734f