LTC3839 Datasheet, PDF (46/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

LTC3839
TYPICAL APPLICATIONS
V_IN
6.5V TO 34V
+ CIN1
56μF
w3
V_OUT
5V
25A
R_S1
0.002Ω
C_OUT1 ⁺
100μF
C_OUT2
150μF
w2
C_IN2
10μF
w3
L1
2.2μH
2.2Ω
1μF
20Ω
20Ω
1nF
0.1μF
LTC3839
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
BOOST2
MT1
TG1
TG2
DB1
2.2Ω
SW1
DRV_CC1
SW2
DRV_CC2
INTV_CC
EXTV_CC
1μF
4.7μF
MB1
BG1
BG2
100k
73.2k
PGND
10k
PGOOD
0.01μF
V_OUTSENSE+
V_{OUTSENSE–}
PGOOD
PHASMD
22pF
TRACK/SS
ITH
470pF
27.4k
MODE/PLLIN
137k
DTR
V_RNG
RT
SGND
CLKOUT
RUN
20Ω
1nF _20Ω
0.1μF
DB2
MT2 _L2
R_S2
2.2μH _0.002Ω
V_OUT
C_OUT3 ⁺
150μF
C_OUT4
100μF
MB2
w2
C_IN1: SUNCON 50HVH56M
C_IN2: MURATA GRM32ER71H106KA12L
C_OUT1, C_OUT4: MURATA GRM31CR60J107ME39L
C_OUT2, C_OUT3: SANYO 6TPE150MIC2
DB1, DB2: ZETEX ZLLS1000
L1, L2: WÜRTH 7443320220
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
3839 F19a
100 _{VIN = 12V}
8
DISCONTINUOUS
MODE
90
6
FORCED
80
CONTINUOUS
4
MODE
70
60
0.1
LOSS
FORCED CM
LOSS
DCM
1
10
LOAD CURRENT (A)
2
0
100
3839 F19b
100 _{VIN = 28V}
8
DISCONTINUOUS
90 MODE
6
80
LOSS
70 _DCM
60
0.1
FORCED
CONTINUOUS
MODE
LOSS
FORCED CM
1
10
LOAD CURRENT (A)
4
2
0
100
3839 F19c
Figure 19. 6.5V to 34V Input, 5V/25A Output, 300kHz, R_SENSE, 5V Output Tied to EXTV_CC, Step-Down Converter
3839fa
46