LTC3838-2_15 Datasheet, PDF (49/56 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
6V TO 26V
+ _CIN1
220µF
V_OUT1
1.2V
12A
R_S1
0.002Ω
C_OUT1 +
100µF
×2
C_OUT2
330µF
×2
C_IN2
10µF
×3
L1
0.47µH
2.2Ω
1µF
100Ω
100Ω
1nF
0.1µF
LTC3838-2
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
100Ω
1nF _100Ω
0.1µF
BOOST1
BOOST2
MT1
TG1
TG2
DB1
2.2Ω
1µF
SW1
DRV_CC1
INTV_CC
4.7µF
SW2
DRV_CC2
EXTV_CC
MB1
BG1
BG2
DB2
MT2
L2
0.47µH
R_S2
0.002Ω
V_OUT2
0.8V TO 2.5V
12A
C_OUT3 +
330µF
C_OUT4
100µF
MB2
×2
×2
10k
PGND
EXTV_REF2
V_REF2+
0.8V TO 2.5V
10k
V_OUTSENSE1+ VDFB2+
10k
10k
V_REF2–
100k
V_{OUTSENSE1–}
PGOOD1 _PGOOD1
0.01µF
V_DFB2–
PGOOD2 ^{PGOOD2 100k}
0.01µF
TRACK/SS1 TRACK/SS2
22pF
47pF
ITH1
220pF
39.2k
ITH2
470pF
13k
DTR1
115k
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
38382 F17
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
75
60
PHASE
45
30
15
GAIN
0
–15
–30
100
FREQUENCY (kHz)
–45
1000
38382 F17b
60
50
40
30
20
10
0
–10
–20
–30
10
Channel 2 Loop Gain
90
75
60
PHASE
45
30
15
GAIN
0
–15
–30
100
FREQUENCY (kHz)
–45
1000
38382 F17c
Channel 2 Closed-Loop
(V_OUT2 / EXTV_REF2)
5
60
0
0
PHASE
GAIN
–5
–60
–10
–120
–15
1
10
100
FREQUENCY (kHz)
–180
1000
38382 F17d
Bode plots taken with OMICRON Lab Bode 100 Vector Network Analyzer.
Figure 17. 6V to 26V Input, 1.2V/15A and 0.8V to 2.5V/15A (V_OUT2: EXTV_REF2 = 1:1)
Dual Output, 350kHz, R_SENSE, Step-Down Converter
For more information www.linear.com/3838-2
38382f
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