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LT1946A Datasheet(PDF) 10 Page - Linear Technology

Part # LT1946A
Description  2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1946A Datasheet(HTML) 10 Page - Linear Technology

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LT1946A
10
sn1946a 1946afs
Low Profile (< 1.1mm Tall) Triple Output TFT Supply (10V, –10V, 20V)
VIN
VIN
5V
SW
FB
3
8
7
1
4
2
65
LT1946A
L1
1.5
µH
D1
R2
10.5k
R1
75k
RC
59k
1946A TA02
C2
20
µF
C5
0.1
µF
C3
1
µF
C4
2.2
µF
C1
4.7
µF
CC
150pF
CSS
100nF
D4
VOFF
–10V
10mA
AVDD
10V
475mA
VON
20V
5mA
D5
C6
0.1
µF
VC
GND*
SHDN
SS
COMP
C1–C6: X5R or X7R
C1: 4.7
µF, 6.3V
C2: 2
× 10µF, 10V
C3: 1
µF, 25V
C4: 2.2
µF, 10V
C5–C6: 0.1
µF, 10V
D1: MICROSEMI UPS120 OR EQUIVALENT
D2–D5: ZETEX BAT54S OR EQUIVALENT
L1: COILCRAFT LP01704-152MC
* EXPOSED PAD MUST ALSO BE GROUNDED
+
D2
D3
OFF ON
AVDD LOAD CURRENT (mA)
1946A TA04
90
85
80
75
70
65
60
55
50
0
100
200
300
400
500
VON LOAD = 5mA
VOFF LOAD = 10mA
Transient Response
100
µs/DIV
1946A TA03
AVDD
50mV/DIV
AC COUPLED
ILI
0.5A/DIV
350mA
200mA
AVDD LOAD
Efficiency
TYPICAL APPLICATIO S


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