LTC3809-1_15 Datasheet, PDF (21/24 Pages) Linear Technology – No RSENSE, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking

TYPICAL APPLICATIONS
C_ITH
220pF
R_ITH
15k
1
MODE
6
IPRG
9
V_IN
8
TG
4
I_TH
LTC3809EDD-1
10
SW
2
TRACK/SS
7
BG
187k
100pF
3
V_FB
59k
GND
11
5
RUN
LTC3809-1
V_IN
2.75V TO 8V
10μF
MP
Si7540DP
L
1.5μH
MN
Si7540DP
C_OUT ⁺
150μF
V_OUT
2.5V
(5A AT 5V_IN)
L: VISHAY IHLP-2525CZ-01
C_OUT: SANYO 4TPB150MC
38091 F08
Figure 8. 550kHz, Synchronous DC/DC Converter with Internal Soft-Start
1
MODE
6 _IPRG
9
V_IN
8
TG
470pF
15k
10nF
4
LTC3809EDD-1
10
I_TH
SW
2
TRACK/SS
7
BG
118k
100pF
3
V_FB
59k
GND
11
5
RUN
V_IN
2.75V TO 8V
10μF
MP
Si3447BDV
L
1.5μH
MN
Si3460DV
D
(OPT)
C_OUT
22μF
x2
V_OUT
1.8V
2A
L: VISHAY IHLP-2525CZ-01
D: ON SEMI MBRM120LT3 (OPTIONAL)
38091 F09
Figure 9. 550kHz, Synchronous DC/DC Converter with External Soft-Start, Ceramic Output Capacitor
38091fc
21