LT3462 Ver la hoja de datos (PDF) - Linear Technology
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Fabricante
LT3462 Datasheet PDF : 8 Pages
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LT3462/LT3462A
TYPICAL APPLICATIO S
3.3V to –12V with Soft-Start Circuit
VIN
L1
47µH
C2
1µF
L2
47µH
3.3V
C1
4.7µF
SW D
VIN
FB
LT3462
SDREF
GND
R1
267k
R2
27.4k
C4
15pF
CS1
100nF
VOUT
–12V
30mA
C3
2.2µF
OFF
M1
22nF
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R EMK212BJ105MG
C3: TAIYO YUDEN EMK316BJ225
L1, L2: MURATA LQH32CN470
3462 TA02a
VOUT Reaches –12V in 750µs; Input
Current Peaks at 300mA without CS1
OFF
VOUT
10V/DIV
IIN
100mA/DIV
2ms/DIV
3462 TA02c
VIN
2.7V
TO 4.2V
Li+ to –8V Supply
L1A
22µH
C2
1µF
L1B
22µH
C1
4.7µF
SW
D
VIN
FB
LT3462
SDREF
GND
R1
267k
R2
42.2k
C4
15pF
VOUT
–8V
C3
4.7µF
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R EMK212BJ105MG
C3: TAIYO YUDEN LMK316BJ475
L1: SUMIDA CLS62-220 OR 2X MURATA LQH32CN330
3462 TA03a
–12V Efficiency
80
TA = 25°C
75
VIN = 3.3V
70
65
60
55
50
0
5 10 15 20 25 30 35
LOAD CURRENT (mA)
3462 TA02b
VOUT Reaches –12V in 7.5ms; Input
Current Peaks at 125mA with CS1 = 100nF
OFF
VOUT
10V/DIV
IIN
50mA/DIV
2ms/DIV
3462 TA02d
–8V Efficiency
80
TA = 25°C
75
VIN = 3.3V
70
65
60
55
50
0
10
20
30
40
50
LOAD CURRENT (mA)
3462 TA03b
3462af
6
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