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| LTC3838-2_15 Datasheet, PDF (52/56 Pages) Linear Technology – Dual, Fast, Accurate Step-Down DC/DC Controller with xternal Reference Voltage and Dual Differential Output Sensing | |||
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LTC3838-2
TYPICAL APPLICATIONS
VIN
4.5V TO 14V
+ CIN1
180µF
CIN2
22µF
Ã4
16.2k
4.02k
L1
MT1
0.4µH
+ COUT1
COUT2
100µF
330µF
Ã2
Ã2
MB1
2.2Ω
1µF
0.1µF
0.1µF
VIN LTC3838-2
SENSE1â
SENSE2â
SENSE1+
SENSE2+
0.1µF
0.1µF
BOOST1
BOOST2
2.2Ω
1µF
DB1
4.7µF
TG1
SW1
DRVCC1
INTVCC
BG1
TG2
SW2
DRVCC2
EXTVCC
BG2
PGND
EXTVREF2
VOUTSENSE1+ VDFB2+
MT2
DB2
MB2
VREF2+
0.4V TO 2.5V 10k
10k
VREF2â
VOUTSENSE1â
PGOOD1
VDFB2â
PGOOD
PGOOD2
0.01µF
100k
TRACK/SS1 TRACK/SS2
100pF
ITH1
ITH2
1000pF
7.5k
16.2k
4.02k
L2
0.4µH
COUT3 +
330µF
Ã2
COUT4
100µF
Ã2
VOUT
0.4V TO 2.5V
50A
CIN1: SANYO 16SVP180MX
CIN2: MURATA GRM32ER61C226KE20L
COUT1, COUT4: MURATA GRM31CR60J107ME39L
COUT2, COUT3: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: VISHAY IHLP5050FDERR40M01
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC010NE2LS
DTR1
137k
RT
SGND
RUN1
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
38382 F20a
100
10
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
8
100
10
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
90
8
2.5
DO
NOT
2.0 USE
80
6
EFFICIENCY
POWER
LOSS
70
4
80
EFFICIENCY
70
6
1.5
POWER
LOSS
4
1.0
EXTVREF2 = VOUT
60
2
60
2
0.5
50
0.1
1
10
VIN = 12V LOAD CURRENT (A)
VOUT = 1.2V
0
38382 F20b
50
0.1
1
10
VIN = 5V LOAD CURRENT (A)
VOUT = 1.2V
0
38382 F20c
0
4 5 6 7 8 9 10 11 12 13 14
VIN (V)
38382 F20d
LIMITED BY VOLTAGE DROP FROM VIN TO INTVCC AND
TRACK/SS2 (INTVCC ⥠4V REQUIRED AT EXTVREF = 1.5V,
AND INTVCC ⥠5V REQUIRED AT EXTVREF2 = 2.5V, AND
TRACK/SS2 > EXTVREF2 AFTER SOFT-START)
Figure 20. 4.5V to 14V Input, 0.4V to 2.5V/50A (VOUT: EXTVREF2 = 1:1)
2-Phase Single Output, 300kHz, DCR Sense, Step-Down Converter
52
For more information www.linear.com/3838-2
38382f
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