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| LTC3542_15 Datasheet, PDF (13/16 Pages) Linear Technology – 500mA, 2.25MHz Synchronous Step-Down DC/DC Converter | |||
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APPLICATIONS INFORMATION
VIN
2.7V TO 5.5V
CIN**
10μF
L*
2.2μH
VIN
SW
CF 22pF
VOUT
1.8V
500mA
LTC3542
RUN VFB
MODE/SYNC
GND
R2
150k
R1
75k
COUT**
10μF
3542 F03a
*SUMIDA CDRH2D18HD-2R2NC
**TDK C2012X5R0J106M
Figure 3a. Typical Application
R1
CF
GND
R2
LTC3542
VIN
VFB 1
6 RUN VIA TO VOUT
VIN 2
GND
5 MODE/
SYNC
CIN
GND 3
4 SW
L
GND
COUT
VOUT
3542 F03b
Figure 3b. Layout Diagram
100
90
80
70
60
50
40
30
20 VOUT = 1.8V
10 Burst Mode OPERATION
FIGURE 3a CIRCUIT
0
0.1
1
10
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
100
1000
OUTPUT CURRENT (mA)
3542 G17
Figure 3c. Efï¬ciency Curve
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
20μs/DIV
VOUT = 1.8V
ILOAD = 0mA TO 500mA
FIGURE 3a CIRCUIT
3542 G06
Figure 3d. Load Step
3542fa
13
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