LTC3838-1_15 Datasheet, PDF (46/52 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_OUT1
1.2V
20A
R_S1
L1
0.0015Ω 0.47µH
C_OUT1 +
100µF
×2
C_OUT2
330µF
×2
2.2Ω
1µF
100Ω
100Ω
1nF
0.1µF
LTC3838-1
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
BOOST2
M1
TG1
TG2
DB1
2.2Ω
1µF
SW1
4.7µF
DRV_CC1
INTV_CC
BG1
SW2
DRV_CC2
EXTV_CC
BG2
100Ω
1nF _100Ω
0.1µF
DB2
M2
L2
R_S2
0.47µH 0.0015Ω
C_OUT3 +
330µF
×2
C_OUT4
100µF
×2
V_OUT2
1.5V
20A
100k
PGND
15k
10k
10k
V_OUTSENSE1+
V_DFB2+
10k //15k
10k
SGND
V_{OUTSENSE1–} V_DFB2–
PGOOD1 _PGOOD1
PGOOD2 ^{PGOOD2 100k}
0.01µF
0.01µF
TRACK/SS1 TRACK/SS2
47pF
47pF
ITH1
470pF
23.2k
ITH2
470pF
23.2k
137k
DTR1
V_RNG
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
38381 F18
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: WÜRTH 7443330047
M1, M2: INFINEON BSC0911ND
100
4
V_IN = 12V FCM
V_IN = 12V DCM
90
3
80
2
LOSS
70
1
60
0.1
1
10
LOAD CURRENT (A)
V_IN = 12V
V_OUT = 12V
0
100
38381 F18b
100
10
V_IN = 5V FCM
V_IN = 5V DCM
8
90
6
80
4
70
LOSS
2
60
0.1
V_IN = 5V
V_OUT = 12V
1
10
LOAD CURRENT (A)
0
100
38381 F18c
Figure 18. 4.5V to 14V Input, 1.2V/20A and 1.5V/20A Dual Output, 300kHz, R_SENSE, Step-Down Converter
46
For more information www.linear.com/3838-1
38381f