MIC2570 Datasheet, PDF (11/14 Pages) Micrel Semiconductor – Two-Cell Switching Regulator Preliminary Information

MIC2570
C2
68µF, 35V
C1
2.0V to 3.1V 330µF
2 Cell
16V
L1
47µH
U1
8
IN
1
SW
MIC2570
FB ⁶
SYNC GND
7
2
D1
D2
1N5819
1N5819
C3
68µF
35V
D3
1N5819
R2
2.2M
1%
R1
10k
1%
V_OUT
50V/10mA
C4
82µF
63V
U1 Micrel
C1 Sanyo
C2 Sanyo
C3 Sanyo
C4 Sanyo
D1 Motorola
D2 Motorola
D3 Motorola
L1 Sumida
MIC2570-2BM
V_OUT = 0.22
16MV330GX Electrolytic ESR = 0.1Ω
35MV68GX Electrolytic ESR = 0.22Ω
35MV68GX Electrolytic ESR = 0.22Ω
63MV826X Electrolytic ESR = 0.34Ω
1N5819
1N5819
1N5819
RCH106-470k DCR = 0.16Ω
1+R2/R1)
Example 9. Voltage Doubler
C1
2.0V to 3.1V 100µF
2 Cell
10V
D1
L1 ^MBRA140
47µH
U1
8
IN
1
SW
MIC2570
6
FB
SYNC GND
7
2
D2
LED
X5 _ILED
R1
11k
1%
C2
220µF
10V
U1 Micrel
C1 AVX
C2 AVX
D1 Motorola
L1 Coilcraft
I = 0.22V/R1
MIC2570-2BM
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
MBRA140T3
DO3316P-473 DCR = 0.12Ω
Example 10. Constant-Current LED Supply
C1
2.0V to 3.1V _100µF
2 Cell
10V
L1
D1
47µH
MBRA140
U1
8
IN
1
SW
MIC2570
6
FB
SYNC GND
7
2
D2
1N4148
R2
434k
1%
R1
20k
1%
V_OUT
5V/100mA
C2
220µF
10V
V_OUT = 0.22V (1+R2/R1)
Enable
Shutdown
R3
100k
74C04
U1 Micrel
C1 AVX
C2 AVX
D1 Motorola
L1 Coilcraft
MIC2570-2BM
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
MBRA140T3
DO3316P-473 DCR = 0.12Ω
Example 11. 5V/100mA Regulator with Shutdown
Micrel
4-72
1997