LTC3838-2_15 Datasheet, PDF (48/56 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with xternal Reference Voltage and Dual Differential Output Sensing

LTC3838-2
TYPICAL APPLICATIONS
V_IN
4.5V TO 38V
+ _CIN1
100µF
C_IN2
10µF
×3
3.57k
V_OUT1
1.2V
15A
L1
MT1
0.56µH
+ C_OUT1
C_OUT2
100µF
330µF
×2
×2
MB1
2.2Ω
1µF
15k
0.1µF
0.1µF
LTC3838-2
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
0.1µF 15k
0.1µF
DB1
2.2Ω
1µF
10k
BOOST1
TG1
BOOST2
TG2
SW1
4.7µF
DRV_CC1
INTV_CC
BG1
SW2
DRV_CC2
EXTV_CC
BG2
PGND
EXTV_REF2
V_OUTSENSE1+ VDFB2+
10k
MT2
DB2
MB2
V_REF2+
0.4V TO 1.25V _20k
10k
20k
V_REF2–
3.57k
L2
0.56µH
C_OUT4 +
330µF
×2
C_OUT3
100µF
×2
V_OUT2
0.8V TO 2.5V
15A
100k
V_{OUTSENSE1–}
PGOOD1 _PGOOD1
0.01µF
V_DFB2–
PGOOD2 ^PGOOD2
0.01µF
100k
TRACK/SS1 TRACK/SS2
22pF
22pF
ITH1
220pF
20k
ITH2
220pF
20k
DTR1
115k
RT
DTR2
PHASMD
SGND
MODE/PLLIN
CLKOUT
RUN1
RUN2
C_IN1: NICHICON UCJ1H101MCL1GS
C_IN2: MURATA GRM32ER71H106K
C_OUT2, C_OUT4: SANYO 2R5TPE330M9
C_OUT1, C_OUT3: MURATA GRM31CR60J107ME39L
DB1, DB2: DIODES INC. SDM10K45
L1, L2: TOKO FDA1055-R56M
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
38382 F16a
100
2.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
2.0
80
EFFICIENCY
70
60
1.5
POWER
LOSS
1.0
50
40
0.1
0.5
V_IN = 12V
V_OUT = 1.2V
0
1
10
LOAD CURRENT (A)
38382 F16b
100
3.0
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
2.5
80
EFFICIENCY
70
60
2.0
POWER
LOSS
1.5
1.0
50
40
0.1
0.5
V_IN = 12V
V_OUT = 1.5V
0
1
10
LOAD CURRENT (A)
38382 F16c
Figure 16. 4.5V to 38V Input, 1.2V/15A and 0.8V to 2.5V/15A (V_OUT2: EXTV_REF2 = 2:1)
Dual Output, 350kHz, DCR Sense, Step-Down Converter
48
For more information www.linear.com/3838-2
38382f