LTC3808 Datasheet, PDF (25/28 Pages) Linear Technology – No RSENSE TM, Low EMI, Synchronous DC/DC Controller with Output Tracking

TYPICAL APPLICATIO S
LTC3808
Synchronizable, Synchronous DC/DC Converter with Output Tracking
10nF
220pF
2
SYNC/MODE
10k ₁
PLLLPF
12
V_IN
SENSE^{+ 11}
8
IPRG
1M ₄
PGOOD
10
TG
13
SENSE^–
15k
6
I_TH
LTC3808EDE
14
SW
1.18k
Vx
3
TRACK/SS
9
BG
118k
100pF
590Ω
5
V_FB
59k
GND
15
7
RUN
10Ω
1µF
V_IN
2.75V TO 8V
10µF
MP
Si7540DP
L
1.5µH
MN
Si7540DP
C_OUT ⁺
150µF
V_OUT
1.8V
(5A AT 5V_IN)
3808 TA02
L: VISHAY IHLP-2525CZ-01
C_OUT: SANYO 4TPB150MC
V_OUT < Vx
Resistor Sensing, Synchronous DC/DC Converter with Spread Spectrum Modulation
2200pF
301k
1000pF
1M
220pF
15k
10nF
2
SYNC/MODE
12
V_IN
1
PLLLPF
SENSE^{+ 11}
8
IPRG
4
PGOOD
SENSE^{– 13}
10
TG
6
I_TH
LTC3808EDE
14
SW
10Ω
1µF
3
TRACK/SS
9
BG
88.7k
100pF
5
V_FB
59k
GND
15
7
RUN
V_IN
2.75V TO 8V
10µF
0.03Ω
R_SENSE
MP
Si4431BDY
L
1.5µH
MN
Si4860DY
C_OUT ⁺
150µF
V_OUT
1.5V
2A
3808 TA03
L: VISHAY IHLP-2525CZ-01
C_OUT: SANYO 4TPB150MC
R_SENSE: DALE 0.25W
3808f
25