LTC3838-1_15 Datasheet, PDF (50/52 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
R_S1
0.004Ω
L1 ^MT1
0.3µH
C_OUT1
100µF
×3
MB1
2.2Ω
1µF
10Ω
10Ω
1nF
0.1µF
LTC3838-1
V_IN
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
10Ω
1nF _10Ω
0.1µF
DB2
MT2 _L2
0.3µH
R_S2
0.004Ω
C_OUT2
100µF
MB2
×3
V_OUT
3.3V
25A
PGND
V_OUTSENSE1+
V_{OUTSENSE1–}
PGOOD1
V_DFB2+
V_DFB2–
PGOOD2
45.3k
10k ^10k//45.3k
SGND
PGOOD ^100k
0.01µF
TRACK/SS1 TRACK/SS2
ITH1
ITH2
100pF
51.1k
18.7k
DTR1
V_RNG
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
38381 F22a
C_IN1: SANYO 165VP180MX
C_IN2: MURATA GRM32ER61C226KE20L
C_OUT1, C_OUT2: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL CMDSH-3
L1, L2: WÜRTH 7443340030
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC032NE2LS
100
2.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
2.0
80
EFFICIENCY
70
1.5
POWER
LOSS
1.0
60
0.5
50
0.01
0.1
1
V_IN = 12V LOAD CURRENT (A)
V_OUT = 5V
EXTV_CC TIED TO V_OUT
0
38381 F22b
100
2.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
2.0
80
1.5
EFFICIENCY
70
1.0
60
POWER _0.5
LOSS
50
0.01
0.1
0
1
V_IN = 12V LOAD CURRENT (A)
V_OUT = 3.3V
EXTV_CC TIED TO 5V BIAS SUPPLY
38381 F22c
EFFICIENCY MEASUREMENTS INCLUDE POWER
FROM THE 5V BIAS SUPPLY
Figure 22. 4.5V to 14V Input, 3.3V/25A Output, 2MHz, R_SENSE, Step-Down Converter
50
For more information www.linear.com/3838-1
38381f