LT3489 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT3489 Datasheet PDF : 12 Pages
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LT3489
TYPICAL APPLICATIO
D2
D3
C5
0.1µF
VIN
3.3V
+
L1
2.2µH
6
5
3 VIN
SW
OFF ON SHDN
C1
4.7µF
8 SS LT3489
7
COMP
2
FB
VC
GND*
CSS
100nF
1
4
37.4k
220pF
C1 TO C8: X5R OR X7R
C1: AVX 08056D475KAT
C2: 2 × 10µF, TAIYO YUDEN LMK316BJ106ML
C3: 2 × 10µF, 10V
C4: 2 × 1µF, AVX08053D105KAT
C5, C6, C7: 0.1µF, 10V
C8: 0.1µF, 16V
D1: DIODES INC. DFLS220L
D2 TO D7: ZETEX BAT54S OR EQUIVALENT
L1: COOPER BUSSMANN SD25-2R2
* EXPOSED PAD MUST ALSO BE GROUNDED
D1
C8
0.1µF
D4
D5
C6
0.1µF
C7
0.1µF
VON
23V
10mA
10mA
R2
28.7k
R3
5.23k
C2
20µF
AVDD
8V
610mA
C4
2µF
D7
C3
2µF
D6
VOFF
–8V
3489 TA04 20mA
Effciency
90
85
80
75
70
65
60
55 VON LOAD = 10mA
50 VOFF LOAD = 20mA
0 100 200 300 400 500 600 700
AVDD LOAD CURRENT (mA)
3489 TA01b
AVDD
100mV/DIV
AC COUPLED
IL1
1A/DIV
400mA
ILOAD
200mA
Transient Response
AVDD
5V/DIV
VON
20V/DIV
VOFF
5V/DIV
5µs/DIV
3489 TA07
IIN
0.5A/DIV
Start-Up Waveforms
5ms/DIV
3489 TA08
3489f
10
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