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LTC3419 Datasheet(PDF) 14 Page - Linear Technology

Part # LTC3419
Description  Dual Monolithic 600mA Synchronous Step-Down Regulator
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3419 Datasheet(HTML) 14 Page - Linear Technology

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LTC3419
14
3419f
VIN = 3.6V
VOUT = 1.8V
ILOAD = 40mA TO 600mA
ILOAD
500mA/DIV
IL
500mA/DIV
VOUT
100mV/DIV
AC-COUPLED
20
μs/DIV
3419 F04c1
VIN = 3.6V
VOUT = 2.5V
ILOAD = 40mA TO 600mA
ILOAD
500mA/DIV
IL
500mA/DIV
VOUT
100mV/DIV
AC-COUPLED
20
μs/DIV
3419 F04c2
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 efficiency curve and transient response.
Figure 4a. Design Example Circuit
Figure 4b. Efficiency vs Output Current
Figure 4c. Transient Response
APPLICATIONS INFORMATION
VIN
RUN2
RUN1
LTC3419
VFB2
SW2
SW1
MODE
VFB1
CF2, 22pF
CF1, 22pF
GND
VIN
2.5V TO 5.5V
VOUT2
1.8V AT
600mA
VOUT1
2.5V AT
600mA
3419 F04a
R4
118k
R2
187k
R3
59k
R1
59k
L2
2.2
μH
L1
2.2
μH
COUT2
10
μF
COUT1
10
μF
C1
10
μF
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
L1, L2: TDK VLF3010AT2R2M1RD
Load Step
Transient Response
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
0.1
10
100
1000
1
VOUT = 1.8V
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
3419 F04b
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
0.1
10
100
1000
1
VOUT = 2.5V
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V



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