LTC3838-2_15 Datasheet, PDF (53/56 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
6.5V TO 34V
+ _CIN1
220µF
V_OUT1
5V
12A
R_S1
0.002Ω
C_OUT1 ⁺
100µF
C_OUT2
150µF
×2
C_IN2
10µF
×3
L1
2.2µH
2.2Ω
1µF
20Ω
20Ω
1nF
0.1µF
LTC3838-2
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
20Ω
1nF _20Ω
0.1µF
BOOST1
BOOST2
MT1
TG1
TG2
DB1
DB2
2.2Ω
1µF
SW1
DRV_CC1
INTV_CC
4.7µF
SW2
DRV_CC2
EXTV_CC
V_OUT1
MB1
BG1
BG2
73.2k
PGND
EXTV_REF2
V_OUTSENSE1+ VDFB2+
V_REF2+
1.25V TO 2.5V _20k
10k
10k
20k
V_REF2–
100k
V_{OUTSENSE1–}
PGOOD1 _PGOOD1
0.01µF
V_DFB2–
PGOOD2 ^PGOOD2
0.01µF
100k
TRACK/SS1 TRACK/SS2
22pF
47pF
ITH1
220pF
53.6k
ITH2
470pF
15k
DTR1
137k
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
MT2
L2
1.3µH
R_S2
0.002Ω
C_OUT3 +
150µF
C_OUT4
100µF
MB2
×2
V_OUT2
2.5V TO 5V
12A
38382 F21a
C_IN1: PANASONIC EEEFK1V221P
C_IN2: TAIYO YUDEN GMK325BJ106MN-T
C_OUT1, C_OUT4: MURATA GRM31CR60J107ME39L
C_OUT2, C_OUT3:SANYO 6TPE150MIC2
DB1, DB2: DIODES INC. SDM10K45
L1: WÜRTH 7443320220
L2: WÜRTH 7443551130
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
100
3.0
90
2.5
80
2.0
EFFICIENCY
70
1.5
POWER
LOSS
60
1.0
50
40
0.1
1
LOAD CURRENT (A)
0.5
V_IN = 12V
V_OUT = 5V
0
10
38382 F21b
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
100
3.0
90
2.5
80
2.0
EFFICIENCY
70
1.5
POWER
LOSS
60
1.0
50
40
0.1
0.5
V_IN = 12V
V_OUT = 3.3V
0
1
10
LOAD CURRENT (A)
38382 F21c
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
Figure 21. 6.5V to 34V Input, 5V/12A and 2.5V to 5V/12A (V_OUT2: EXTV_REF2 = 2:1)/12A Dual Output,
300kHz, R_SENSE, 5V Output Tied to EXTV_CC, Step-Down Converter
For more information www.linear.com/3838-2
38382f
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