LTC3838-2_15 Datasheet, PDF (54/56 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 14V
C_IN1 ⁺
180µF
R_S1
0.002Ω
C_OUT1
100µF
×3
C_IN2
22µF
×4
L1 ^MT1
0.3µH
MB1
2.2Ω
1µF
10Ω
10Ω
1nF
0.1µF
LTC3838-2
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
10Ω
1nF _10Ω
0.1µF
BOOST1
TG1
DB1
2.2Ω
1µF
SW1
4.7µF
DRV_CC1
INTV_CC
BG1
BOOST2
TG2
SW2
DRV_CC2
EXTV_CC
BG2
PGND
EXTV_REF2
V_OUTSENSE1+ VDFB2+
MT2 _L2
DB2
0.3µH
MB2
V_REF2+
1V TO 2.5V _20k
20k ^10k
V_REF2–
V_{OUTSENSE1–}
PGOOD1
V_DFB2–
PGOOD2
PGOOD
0.01µF
100k
TRACK/SS1 TRACK/SS2
ITH1
ITH2
220pF
16.2k
R_S2
0.002Ω
C_OUT2
100µF
×3
18.7k
DTR1
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
V_OUT
2V TO 5V
25A
C_IN1: SANYO 16SVP180MX
C_IN2: MURATA GRM32ER61C226KE20L
C_OUT1, C_OUT2: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL CMDSH-3
MT1, MT1: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC032NE2LS
L1, L2: WÜRTH 7443340030/WÜRTH 7443340047
38382 F22a
100 _{VIN = 12V}
10
V_OUT = 3.3V
90
DISCONTINUOUS
MODE
8
80
70
LOSS
60
FORCED
CM
50
0.1
FORCED
CONTINUOUS
MODE
LOSS
DCM
1
10
LOAD CURRENT (A)
6
4
2
0
100
38382 F22b
100
DISCONTINUOUS
MODE
90
80
FORCED
CONTINUOUS
MODE
70
10
V_IN = 5V
V_OUT 3.3V
8
6
4
60
LOSS
FORCED CM
50
0.1
1
2
LOSS
DCM
0
10
100
LOAD CURRENT (A)
38382 F22c
5 _{DO NOT}
USE
4
L1, L2: WÜRTH
7443340047 (0.47µH)
3
L1, L2: WÜRTH 7443340030 (0.3µH)
2
4 5 6 7 8 9 10 11 12 13 14
V_IN (V)
38382 F22d
Figure 22. 4.5V to 14V Input, 2V to 5V/25A (V_OUT2: EXTV_REF2 = 2:1) Output, 2MHz, R_SENSE, Step-Down Converter
54
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38382f