LTC3819 Datasheet, PDF (10/32 Pages) Linear Technology – 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs

LTC3819
W
FU CTIO AL DIAGRA
PLLIN
f_IN
50k
R_LP PLLFLTR
C_LP
PHASE DET
OSCILLATOR
CLK1
CLK2
TO SECOND
CHANNEL
PGOOD
0.66V
V_OS–
40k
EAIN
0.54V
40k
–
A1
V_OS+
40k
+
40k
DIFFOUT
3V
0.18µA
FCB
4.5V –
+
+
–
V_IN
0.60V
FCB
V_REF
EXTV_CC
INTV_CC
+^5V
SGND
4.8V +
–
5V
LDO
REG
INTERNAL
SUPPLY
ATTENIN _5k
ATTENOUT
R1
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
INTV_CC
V_IN
BOOST
D_B
DROP
OUT
DET
SQ
RQ
0.55V ^{+ B}
–
BOT FCB
TOP ON
TG
TOP
SW
SWITCH
LOGIC
INTV_CC
BG
BOT
PGND
SHDN
I₁
–+
0.86V
5V_FB
SLOPE
COMP
45k
1.2µA
6V
SHDN
RST
5V_FB
– ^I2
+
INTV_CC
30k ^SENSE+
30k ^SENSE–
45k
2.4V
EA
OV
V_FB
0.60V
EAIN
0.66V
RUN
I_TH
SOFT-
START
C_B
+
D1
C_IN
C_OUT
L
1 ^RSENSE 2
3
4
C_C
C_C2 R_C
RUN/SS
C_SS
5-BIT VID DECODER
TYPICAL ALL
VID PINS
40k
V_OUT
NO_CPU
VID0 VID1 VID2 VID3 VID4
V_BIAS
3819 FBD
3819f
10