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| LTC3419 Datasheet, PDF (14/16 Pages) Linear Technology – Dual Monolithic 600mA Synchronous Step-Down Regulator | |||
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LTC3419
APPLICATIONS INFORMATION
Using the same analysis for channel 2 (VOUT2 = 1.8V),
the results are:
L2 = 1.9μH
R3 = 59k
R4 = 118k
CF2 = 22pF
Figure 4 shows the complete schematic for this example,
along with the efï¬ciency curve and transient response.
VIN
2.5V TO 5.5V
VOUT2
1.8V AT
600mA
C1
10μF
L2
2.2μH
CF2, 22pF
RUN2 VIN RUN1
MODE
LTC3419
SW2
SW1
L1
2.2μH
CF1, 22pF
VOUT1
2.5V AT
600mA
COUT2
10μF
R4
118k
VFB2
VFB1
R3
GND
59k
R1 R2
59k 187k
COUT1
10μF
3419 F04a
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
L1, L2: TDK VLF3010AT2R2M1RD
Figure 4a. Design Example Circuit
100
90
80
70
60
50
40
30
20
10
0 VOUT = 1.8V
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0 VOUT = 2.5V
0.1
1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
10
100
1000
OUTPUT CURRENT (mA)
3419 F04b
Figure 4b. Efï¬ciency vs Output Current
Load Step
VOUT
100mV/DIV
AC-COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
20μs/DIV
VIN = 3.6V
VOUT = 1.8V
ILOAD = 40mA TO 600mA
Transient Response
VOUT
100mV/DIV
AC-COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
3419 F04c1
20μs/DIV
VIN = 3.6V
VOUT = 2.5V
ILOAD = 40mA TO 600mA
Figure 4c. Transient Response
3419 F04c2
3419f
14
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