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| LTC3543 Datasheet, PDF (14/16 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum | |||
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LTC3543
APPLICATIO S I FOR ATIO
GND
VIN
VOUT
VIA TO R2
VIA TO R1
COUT
CIN
L
C1
SW
VIN
CAP
MODE
GND
RUN
VFB
R1
R2
CFWD
VIA TO GND
Figure 6. LTC3543 Suggested Layout
VIA TO VOUT 3543 F08
TYPICAL APPLICATIO S
Li-Ion
BATTERY
2.7V TO 4.2V
L
3.3µH*
VIN
SW
10µFâ
R2
LTC3543
604k
PWR_EN RUN
VFB
MODE CAP
R1
GND
402k
1.5V
CFWD
10pF
VOUT
COUT 1.5V
4.7µF**
â muRata GRM40X5R106K1H520
* TDK VLCF5020-3R3N1R6
** TDK TDKC2012X5R0J475MT
EXPOSED
PAD
VOUT
AC COUPLED
100mV/DIV
IL
200mA/DIV
ILOAD
200mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 1.5V
ILOAD = 3mA TO 200mA
VMODE = 0V
3543 G22
3543 TA02
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
VOUT = 1.5V
1
10
100
LOAD CURRENT (mA)
1000
3543 TA04
14
3543f
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