LTC3617_15 Datasheet, PDF (17/20 Pages) Linear Technology – 6A Monolithic Synchronous Step-Down Regulator for DDR Termination

LTC3617
Typical Applications
1.25V, ±6A DDR Memory Termination Supply, 2.25MHz
V_IN
2.5V TO 5.5V
C_IN
22µF
×4
R_C
20k
C_C
470pF
VDDQ
2.5V
R1
100k
PGOOD
C_C1
10pF
R_F
24Ω
C_F
1µF
SV_IN
RUN
PV_IN
VTTR
VDDQIN
RT
LTC3617
SW
PGOOD
SGND
ITH
PGND
SYNC
V_FB
L1
0.15µH
V_REF
1.25V
C_{O1 ±10mA}
0.1µF
VTT
1.25V
C_{O2 ±6A}
100µF
3617 TA02a
L1: VISHAY IHLP-2525CZ-01 150nH
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs Load Current
V_IN = 2.5V
V_IN = 3.3V
V_IN = 5V
1
LOAD CURRENT (A)
10
3617 TA02b
Load Step Response
V_TT
50mV/DIV
I_L
4A/DIV
V_IN = 3.3V
VTT = 1.25V
40µs/DIV
I_LOAD = 100mA TO 6A
3617 TA02c
3617fa
17