MIC2570 Datasheet, PDF (12/14 Pages) Micrel Semiconductor – Two-Cell Switching Regulator Preliminary Information

MIC2570
C1
2.0V to 3.1V _100µF
2 Cell
10V
R1
510Ω
L1
D1
47µH
U1
8
IN
1
SW
MIC2570
6
FB
SYNC _GND
7
2
D2
1N4148
MBRA140
R2
434k
1%
R1
20k
1%
Q1
ZTX7888
C2
220µF
10V
V_OUT
5V/100mA
C3
220µF
10V
V_OUT = 0.22V (1+R2/R1)
Enable
Shutdown
R3
100k
74C04
U1 Micrel
C1 AVX
C2 AVX
C3 AVX
D1 Motorola
L1 Coilcraft
Q1 Zetex
MIC2570-2BM
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
MBRA140T3
DO3316P-473 DCR = 0.12Ω
ZTX7888
Example 12. 5V/100mA Regulator with Shutdown and Output Disconnect
D2
MBRS130L
2.0V to 3.1V
2 Cell
C1
100µF
10V
L1
47µH
U1
8
IN
1
SW
MIC2570
4
5V
SYNC GND
7
2
D1
MBRA140
V_OUT
5V/70mA
C2
220µF
10V
U1 Micrel
C1 AVX
C2 AVX
D1 Motorola
D2 Motorola
L1 Coilcraft
MIC2570-1BM
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
MBRA140T3
MBRS130L
DO3316P-473 DCR = 0.12Ω
Example 13. Reversed-Battery Protected Regulator
2.0V to 3.1V
2 Cell
body diode
Q1
Si9434
D3
1N4148
C4 R1
0.1µF 100k
L1
D1
C3
0.1µF
D2
1N4148
47µH
U1
8
C1
100µF
10V
IN
1
SW
MIC2570
5V ⁴
SYNC GND
7
2
MBRA140
V_OUT
5V/100mA
C2
220µF
10V
U1 Micrel
C1 AVX
C2 AVX
D1 Motorola
D2 Motorola
D3 Motorola
L1 Coilcraft
Q1 Siliconix
MIC2570-1BM
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
MBRA140T3
MBRS130LT3
MBRS130LT3
DO3316P-473 DCR = 0.12Ω
Si9434 PMOS
Example 14. Improved Reversed-Battery Protected Regulator
Micrel
4
1997
4-73