LT1946 LINER [Linear Technology], LT1946 Datasheet - Page 9

• Manufacturer Part Number: LT1946
• Description: 1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
• Manufacturer: LINER [Linear Technology]

TYPICAL APPLICATIO S
85
80
70
65
60
50
90
75
55
0
V
V
ON
OFF
LOAD = 5mA
3.3V TO 5V
LOAD = 10mA
100
AV
DD
V
IN
V
LOAD CURRENT (mA)
IN
= 3.3V
Efficiency
200
+
C1 TO C6: X5R OR X7R
C1: 4.7 F, 6.3V
C2: 2 10 F, 10V
C3: 1 F, 25V
C4: 2.2 F, 10V
C5, C6: 0.1 F, 10V
D1: MICROSEMI UPS120 OR EQUIVALENT
D2 TO D5: ZETEX BAT54S OR EQUIVALENT
L1: SUMIDA CDRH5D18-5R4
100nF
C1
4.7 F
300
C
SS
OFF ON
U
V
Low Profile, Triple Output TFT Supply (10V, –10V, 20V)
IN
400
= 5V
1946 TA01a
3
8
7
500
SHDN
SS
COMP
V
V
IN
C
1
6
R
33.3k
C
LT1946
C
470pF
5.4 H
C
L1
GND
SW
FB
5
4
2
0.1 F
C6
LOAD
D1
AV
AC COUPLED
DD
50mV/DIV
0.5A/DIV
150mA
100mA
AV
R1
75k
R2
10.5k
D4
D5
DD
I
LI
V
D2
IN
= 5V
D3
C5
0.1 F
C2
20 F
C4
2.2 F
Transient Response
1946 TA01
C3
1 F
100 s/DIV
V
–10V
10mA
V
20V
5mA
AV
10V
450mA, V
275mA, V
OFF
ON
DD
IN
IN
= 5V
= 3.3V
1946 TA01b
LT1946
sn1946 1946fs
9