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

MIC4575
Micrel
D3
U1
5 _SHDN
SW ²
V_IN
MIC4575BT
12V to 24V _{1 VIN}
C1
150µF
35V
GND
3
FB ⁴
R7
1k
1N4148
L1
D1
68µH
R6
1N5819
3k
C4
1000pF
U2A
1/2LM358 ₃
1
R1
0.1Ω
R2
100Ω
1%
R5
1.0k
1%
D2
1N5819
C2
330µF
16V
I_OUT
1A
V_BATT
2 Li Cells
U1 Micrel MIC4575BT
U2 National LM358
U3 National LM3420
C3
2
V_IN
0.01µF
U4 National
C1 Nichicon
C1 Nichicon
D1 Motorola
D2 Motorola
DZ1 Motorala
L1 Bi
R1 KRL
Q1 Siliconix
LM339
UPL1V151MPH, ESR = 0.12Ω
UPL1C331MPH, ESR = 0.12Ω
1N5819
1N5819
1N5244
HM77-11003, DCR = 0.233Ω
SP-1/2-A1-0R100J
VN2222LL
5
U2B
1/2 LM358
6
C5
0.1µF
8
7
4
Q1
VN2222LL
U3
8
3
IN
COMP
1.24V R2
I_OUT = _R3
R1
V_IN
R8
10k
R9
10M
R3
1.21k
1%
R10
10k
Q2
2N2222
C8
0.01µF
LM3420
1 _OUT
GND
I_OUT = 1.02A
V_{IN min} >
=
V_BATT
0.9
+ 2.5V
4
V_IN
C7
R12
0.01µF
R4
100k
13.0k
C6
1%
4
0.1µF 3
7
I_OUTEND 60mA
I_OUTEND 1.23V
R2 _– R5
R3 R4
R1
END
1
6
12
LM339
Figure 24. Lithium-Ion Battery Charger with End-of-Charge Flag
V_IN
9V to 18V
C1
22µF
35V
U1
5 _SHDN
SW ²
MIC4575BU
1 V_IN
GND
3
FB 4
L1
6.0V
L2
68µH
1µH
R2
3.92k
1%
D1
MBRS130LT3
R1
1.00k
1%
C3
3300pF
C2
220µF
10V
U2
1 _VIN
V_OUT ³
MIC29150
C3
100µF
10V
GND
2
V_OUT
5V/1A
C4
22µF
10V
U1 Micrel
U2 Micrel
C1 AVX
C2 AVX
C3 AVX
C4 Sprague
D1 Motorola
D2 Motorola
L1 Bi
L2 Coilcraft
MIC4575BU
MIC29150-5.0BU
TPSE226M035R0300, ESR = 0.3Ω
TPSE227M010R0100, ESR = 0.1Ω
TPSE106M010R0200, ESR = 0.2Ω
293D226X0010C2W
MBRS130LT3
MBRS130LT3
HM77-11003, DCR = 0.233Ω
D016087C-102, DCR = 0.05Ω
V_OUT = 1.23
R2
1+
R1
Figure 25. Low Output-Noise Regulator (<1mV)
April 1998•
4-117