lt3742 Linear Technology Corporation, lt3742 Datasheet - Page 21

• Manufacturer Part Number: lt3742
• Description: Dual, 2-phase Step-down Switching Controller
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
V
OUT1
3.3V
220μF
4A
V
IN
619Ω
200Ω
10μF
14V
680pF
V
IN
1nF
10mΩ
D1, D2: DIODES INC. PDS1040
L1: VISHAY IHLP2525CZER3R3
L2: VISHAY IHLP2525CZER4R7
L3: COILCRAFT: ME3220-223KL
M1, M2: VISHAY Si7848DP-T1-E3
3.3μH
51k
L1
1μF
5V and 3.3V Dual Step-Down Converter
90
70
60
50
80
0
348k
130k
PG1
68pF
Effi ciency vs Load Current
1
UVLO
G1
SW1
SENSE1
SENSE1
FB1
PG1
RUN/SS1
V
V
C1
IN
LOAD CURRENT (A)
22μH
L3
+
–
LT3742
GND
2
SWB
RUN/SS2
SENSE2
SENSE2
3.3V
5V
OUT
BIAS
SW2
OUT
PG2
FB2
V
G2
C2
+
–
3
2.2μF
3742 TA01b
PG2
51k
4
D2
4.7μH
L2
680pF
10mΩ
3742 TA01
1nF
1.05k
200Ω
10μF
V
IN
150μF
V
5V
4A
OUT2
LT3742
21
3742f