LTC3838-1_15 Datasheet, PDF (48/52 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

LTC3838-1
TYPICAL APPLICATIONS
V_IN
4.5V TO 14V
+ _CIN1
180µF
C_IN2
22µF
×4
V_OUT
1.2V
50A
16.2k
4.02k
L1
MT1
0.4µH
+ C_OUT1
C_OUT2
100µF
330µF
×2
×2
MB1
2.2Ω
1µF
0.1µF
0.1µF
V_IN ^LTC3838-1
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
TG1
DB1
2.2Ω
1µF
SW1
4.7µF
DRV_CC1
INTV_CC
BG1
BOOST2
TG2
SW2
DRV_CC2
EXTV_CC
BG2
0.1µF
0.1µF
MT2
DB2
MB2
PGND
V_OUTSENSE1+
V_DFB2+
20k
V_{OUTSENSE1–}
PGOOD1
V_DFB2–
PGOOD
PGOOD2
0.01µF
20k
10k
SGND
100k
TRACK/SS1 TRACK/SS2
47pF
ITH1
ITH2
470pF
47.5k
C_IN1: SANYO 16SVP180MX
C_IN2: MURATA GRM32ER61C226KE20L
C_OUT1, C_OUT4: MURATA GRM31CR60J107ME39L
C_OUT2, C_OUT3: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: VISHAY IHLP5050FDERR40M01
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC010NE2LS
137k
DTR1
V_RNG
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
41.2k
16.2k
4.02k
L2
0.4µH
C_OUT3 +
330µF
×2
C_OUT4
100µF
×2
38381 F20a
100
10
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
8
100
10
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
8
80
6
EFFICIENCY
POWER
LOSS
70
4
80
EFFICIENCY
70
6
POWER
LOSS
4
60
2
60
2
50
0.1
1
10
V_IN = 12V LOAD CURRENT (A)
V_OUT = 1.2V
0
38381 F20b
50
0.1
1
10
V_IN = 5V LOAD CURRENT (A)
V_OUT = 1.2V
0
38381 F20c
Figure 20. 4.5V to 14V Input, 1.2V/50A 2-Phase Single Output, 300kHz, DCR Sense, DTR Enabled, Step-Down Converter
38381f
48
For more information www.linear.com/3838-1