LTC3808 Datasheet, PDF (24/28 Pages) Linear Technology – No RSENSE TM, Low EMI, Synchronous DC/DC Controller with Output Tracking

LTC3808
TYPICAL APPLICATIO S
10nF
10k
220pF
C_ITH
15k
R_ITH
2
SYNC/MODE
12
V_IN
1
PLLLPF
SENSE^{+ 11}
8
IPRG
1M ₄
PGOOD
10
TG
13
SENSE^–
6
I_TH
LTC3808EDE
14
SW
10Ω
1µF
V_IN
2.75V TO 8V
10µF
MP
Si7540DP
L
1.5µH
V_OUT
2.5V
(5A AT 5V_IN)
187k
100pF
3
TRACK/SS
5
V_FB
GND
15
59k
9
BG
7
RUN
MN
Si7540DP
C_OUT ⁺
150µF
L: VISHAY IHLD-2525CZ-01
C_OUT: SANYO 4TPB150MC
3808 F11
Figure 11. 550kHz, Synchronous DC/DC Converter with Internal Soft-Start
2
SYNC/MODE
12
V_IN
10Ω
1µF
V_IN
2.75V TO 8V
10µF
100pF
1
PLLLPF
SENSE^{+ 11}
8
IPRG
1M ₄
PGOOD
10
TG
13
SENSE^–
22k
6
I_TH
LTC3808EDE
14
SW
10nF
3
TRACK/SS
9
BG
118k
100pF
5
V_FB
59k
GND
15
7
RUN
MP
Si3447BDV
L
1.5µH
MN
Si3460DV
D
OPT
C_OUT
22µF
x2
V_OUT
1.8V
2A
L: VISHAY IHLD-2525CZ-01
D: ON SEMI MBRM120L (OPTIONAL)
3808 F12
Figure 12. 750kHz, Synchronous DC/DC Converter with External Soft-Start, Ceramic Output Capacitor
3808f
24