LTC3561 Просмотр технического описания (PDF) - Linear Technology
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LTC3561 Datasheet PDF : 16 Pages
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TYPICAL APPLICATIO S
LTC3561
VIN
2.63V TO
5.5V
C1
10µF
R3
13k
PVIN
SVIN
SW
LTC3561 VFB
ITH
SHDN/RT
SGND PGND
C3
1000pF
L1
2.2µH
R2 887K
3.3V 2.5V 1.8V
C4 22pF
R4
R1A R1B R1C
324k 280k 412k 698k
VOUT
1.8V/2.5V/3.3V
AT 1A
C2
22µF
NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE
C1, C2: TAIYO YUDEN JMK325BJ226MM
L1: TOKO A914BYW-2R2M (D52LC SERIES)
3561 F07a
Figure 6. General Purpose Buck Regulator Using Ceramic Capacitors
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
10
0
1
VIN = 3.3V
VOUT = 2.5V
fO = 1MHz
10
100
LOAD CURRENT (mA)
1000
3561 F07b
VIN
2.63V
TO 5.5V
Small Footprint Buck
C1
10µF
PVIN
PGND
SVIN LTC3561 SW
VFB
SGND
L1
2.2µH
D1
C4
R2
22pF
100k
ITH
SHDN/RT
R3
R4
R1
10k
324k
200k
C3
470pF
1.2V
C2 AT 1.0A
22µF
C1: AVX 06034D106M
C2: AVX 08054D226M
L1: SUMIDA CDRH2D18/HP-2R2
3561 TA02
Efficiency and VOUT Ripple
100
60
VIN = 3.3V
VOUT = 1.2V
90
50
80
40
70
EFFICIENCY
30
60
20
50
40
1
VOUT RIPPLE
10
10
100
ILOAD (mA)
0
1000
3561 TA03
3561f
13
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