MIC4575 Datasheet, PDF (8/12 Pages) Micrel Semiconductor – 200kHz Simple 1A Buck Voltage Regulator

MIC4575
V_IN
4V to 24V
C1
150µF
35V
5 _SHDN
SW ²
MIC4575BT
1 _VIN
FB ⁴
GND
3
Q1
2N4339
R3
3.3K
L1
68µH
D1
1N5819
R1
200K
R2
15k
U2
LM4041CIZ-1.2 V_OUT
(0-12V)/0.5A
C2
330µF
16V
V_OUT Min = 60mV
R4
330Ω
0.5W
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
U2 Micrel LM4041CIZ-1.2
V_{IN min}
V_{IN min}
V_OUT
0.9
and
V_OUT
1.5V
2.5V
Figure 14. Adjustable (0V–12V) Output-Voltage Regulator
U1
V_IN
4V to 15V
C1
150µF
35V
5 _SHDN
SW ²
MIC4575BT
1 _VIN
FB ⁴
GND
3
L1
68µH
D1
1N5819
1
R1
249Ω
1%
3
U2
2 ^LM358
R2
C2
330µF
16V
1.00k
1%
V_OUT
1V/1A
R3
1k
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
U2 National LM358
Figure 15. Low Output-Voltage Regulator (1V)
V_IN
9V to 24V
C1
150µF
35V
5 _SHDN
SW ²
MIC4575BT
1 _VIN
FB ⁴
GND
3
L1
68µH R2
200Ω
1%
D1
1N5819
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
U2 National LM358
Q1 Siliconix VN2222LL
R1 KRL
SP-1/2-A1-0R250J
V_{IN min}
V_{BATT 2.5V}
0.9
1.23V R2
I_{OUT R5 R1}
Q1
VN2222LL
C4
1000pF
R4
3k
R5
1.00k
1%
R1
0.25Ω
R3
10K
U2
LM358
3
1
2
C3
0.01µF
D2
1N5819
I_OUT
1A
C2
330µF
16V
6-8 Cells
V_BATT
DZ1
1N5244
14V
Figure 16. 1A Battery Charger (6–8 cells)
Micrel
4
April 1998•
4-113