LTC3838-1_15 Datasheet, PDF (45/52 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing

LTC3838-1
TYPICAL APPLICATIONS
V_IN
6V TO 26V
+ _CIN1
220µF
C_IN2
10µF
×3
V_OUT1
1.2V
12A
R_S1
0.002Ω
L1
0.47µH
MT1
+ C_OUT1
C_OUT2
100µF
330µF
×2
×2
MB1
2.2Ω
1µF
100Ω
100Ω
1nF
0.1µF
LTC3838-1
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
BOOST2
2.2Ω
1µF
DB1
4.7µF
TG1
SW1
DRV_CC1
INTV_CC
BG1
TG2
SW2
DRV_CC2
EXTV_CC
BG2
100Ω
1nF _100Ω
0.1µF
DB2
MT2
L2
0.47µH
R_S2
0.002Ω
C_OUT3 +
330µF
C_OUT4
100µF
MB2
×2
×2
V_OUT2
1.5V
12A
100k
PGND
10k
V_OUTSENSE1+ VDFB2+
10k
10k
V_{OUTSENSE1–}
PGOOD1 _PGOOD1
0.01µF
V_DFB2–
PGOOD2 ^PGOOD2
0.01µF
100k
TRACK/SS1 TRACK/SS2
22pF
22pF
ITH1
220pF
39.2k
ITH2
220pF
30.1k
115k
DTR1
V_RNG
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
15k
10k //15k
SGND
38381 F17a
C_IN1: PANASONIC EEEFK1V221P
C_IN2: TAIYO YUDEN GMK325BJ106MN-T
C_OUT1, C_OUT4: MURATA GRM31CR60J107ME39L
C_OUT2, C_OUT3: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: WÜRTH 7443330047
MT1, MT2: RENESAS RJK0305DPB
MB1, MB2: RENESAS RJK0330DPB
60
50
40
30
20
10
0
–10
–20
–30
10
Channel 1 Loop Gain
90
Channel 2 Loop Gain
60
90
75
50
75
60
PHASE
45
30
40
60
30
45
PHASE
20
30
15
GAIN
0
10
15
GAIN
0
0
–15
–10
–15
–30
–20
–30
100
FREQUENCY (kHz)
–45
1000
–30
10
100
FREQUENCY (kHz)
–45
1000
38381 F17b
Bode plots taken with OMICRON Lab Bode 100 Vector Network Analyzer.
38381 F17c
Figure 17. 4.5V to 26V Input, 1.2V/15A and 1.5V/15A Dual Output, 350kHz, R_SENSE, Step-Down Converter
For more information www.linear.com3838-1
38381f
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