MIC4575 Datasheet, PDF (7/12 Pages) Micrel Semiconductor – 200kHz Simple 1A Buck Voltage Regulator

MIC4575
Micrel
4.75V to 5.25V
C1
150µF
35V
1 _VIN
SW ²
MIC4575BT
5 _SHDN
4
FB
GND
3
C4
1000pF
R4
5.1K
L1
15µH
R1
3.01k
1%
R2 R3
1.00K _10K
1%
D1
C3
0.01µF ^1N5819
C2
680µF
16V
-5V/0.3A
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C681MPH, ESR = 0.065Ω
D1 Motorola 1N5819
L1 Coiltronics PL52A-15-500, DCR = 0.054Ω
Figure 11. 5V to –5V/0.3A Buck-Boost Converter
Through Hole
V_IN
8V to 18V
C1
22µF
35V
5 _SHDN
SW ²
MIC4575BU
1 _VIN
FB ⁴
GND
3
T1
68µH
4
3
1
2
D1
MBRS130LT3
L1
1µH
C4
220µF
10V
C1 AVX
TPSE226M035R0300, ESR = 0.3Ω
C2 AVX
TPSE227M010R0100, ESR = 0.1Ω
C4 AVX
TPSE227M010R0100, ESR = 0.1Ω
D1 Motorola MBRS130LT3
T1 Coiltronics CTX68-4P, DCR = 0.238Ω
L1 Coilcraft DO1608C-102
R2
3.01k
1%
R1
1.00K
1%
C3
3300pF
V_OUT
5V/1A
5mV_P-P
C2
220µF
10V
Figure 12. Low Output-Noise Regulator (5mV Output Ripple )
V_IN
8V to 18V
C1
22µF
35V
5 _SHDN
SW ²
MIC4575BU
1 _VIN
FB ⁴
GND
D1
3 _MBRS130LT3
T1
2 ^68µH 1
R2
3.01k
1%
R1
1.00K
1%
4
C3
3300pF
+V_OUT/+I_OUT
5V/0.5A
C2
220µF
10V
C5
220µF
10V
L1
D2
MBRS130LT3
3
C4
220µF
10V
C1 AVX
TPSE226M035R0300, ESR = 0.3Ω
C2 AVX
TPSE227M010R0100, ESR = 0.1Ω
C4 AVX
TPSE227M010R0100, ESR = 0.1Ω
C5 AVX
TPSE227M010R0100, ESR = 0.1Ω
D1 Motorola MBRS130LT3
D2 Motorola MBRS130LT3
T1 Coiltronics CTX68-4P, DCR = 0.238Ω
+I_OUT + I_OUT 1A
DC ^{+VOUT 0.5V}
V_IN 0.5V
DC 40% then I_OUT
DC 40% then I_OUT
+I_OUT
I_OUT
-V_OUT/-I_OUT
-5V/0.5A
at V_IN ≥15V
Load Regulation≈±5%
(1 DC)
Figure 13. Split ±5V Supply
4-112
April 1998•