MIC4575 Datasheet, PDF (9/12 Pages) Micrel Semiconductor – 200kHz Simple 1A Buck Voltage Regulator

MIC4575
Micrel
D3
V_IN
8V to 24V
C1
150µF
35V
5 _SHDN
SW ²
MIC4575-BT
1 _VIN
FB ⁴
GND
3
R7
1k
1N4148
L1
68µH
R6
3k
C4
1000pF
1
D1
1N5819
R2
100Ω
1%
3
U2A
1/2LM358
2
U1 Micrel MIC4575BT
U2 National LM358
U3 Micrel LM4041CIZ-1.2
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
D2 Motorola 1N5819
D3 Motorola 1N4148
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
R1 KRL
SP-1-A1-0R100J
Q1 Siliconix VN2222LL
V_{IN min} V_BATT / 0.9 2.5V
C3
0.01µF
DZ1
1N5244
14V
R4
1.21k
1%
R1
0.1Ω
R3
10k
7
Q1
VN2222LL
D2
1N5819
I_OUT
0.1A to 1A
C2
330µF
16V
V_IN
2-8 Cells
V_BATT
V_IN U2B
1/2 LM358
8
5
R5
10k
VR1
10k
6
4
U3
LM4041CIZ-1.2
Figure 17. 0.1A–1A Variable-Current Battery Charger
V_IN
8V to 24V
C1
150µF
35V
5 _SHDN
SW ²
MIC4575-BT
1 _VIN
FB ⁴
GND
3
R6
1k
U1 Micrel MIC4575BT
U2 National LM358
C1 Nichicon UPL1V151MPH, ESR = 0.12Ω
C2 Nichicon UPL1C331MPH, ESR = 0.12Ω
D1 Motorola 1N5819
D2 Motorola 1N5819
D3 Motorola 1N4148
L1 Coiltronics PL52B-68-500, DCR = 0.095Ω
R1 KRL
SP-1-A1-0R100J
Q1 Siliconix VN2222LL
V_{IN min} V_BATT / 0.9 2.5V
1.23V R2
I_{OUT R4 R1}
D3
1N4148
R5
3k
C4
1000pF
1
L1
68µH
D1
1N5819
R1
0.1Ω
R2
100Ω
1%
3
U2A
1/2LM358
2
R3
10k
C3
0.01µF
DZ1
1N5244
14V
V_IN
8
5
U2B
1/2 LM358
7
6
4
Q1
VN2222LL
R4
1.21k
1%
Figure 18. 1A Battery Charger (2–8 Cells)
D2
1N5819
C2
330µF
16V
I_OUT
1A
2-8 Cells
V_BATT
4-114
April 1998•