MIC2570
R1
Micrel, Inc.
L1
47µH
U1
510Ω
D1
Q1
ZTX7888
8
MBRA140
1
6
V
OU T
5V/100mA
C1
2.0V to 3.1V
100µF
2 Cell
10V
IN
FB
S Y N C GND
D2
7
2
1N4148
V
OU T
= 0.22V × (1+R2/R1)
Enable
Shutdown
MIC2570
SW
R2
434k
1%
R1
20k
1%
R3
100k
C2
220µF
10V
C3
220µF
10V
74C04
U1
C1
C2
C3
D1
L1
Q1
Micrel
AVX
AVX
AVX
Motorola
Coilcraft
Zetex
MIC2570-2BM
TPSD107M010R0100
TPSE227M010R0100
TPSE227M010R0100
MBRA140T3
DO3316P-473 DCR =
ZTX7888
Tantalum ESR = 0.1Ω
Tantalum ESR = 0.1Ω
Tantalum ESR = 0.1Ω
0.12Ω
Example 12. 5V/100mA Regulator with Shutdown and Output Disconnect
MBRA140
D1
1
4
MBRS130L
D2
2.0V to 3.1V
2 Cell
C1
100µF
10V
L1
47µH
V
OU T
5V/70mA
U1
8
IN
MIC2570
SW
5V
SYNC
7
GND
2
C2
220µF
10V
U1
C1
C2
D1
D2
L1
Micrel
AVX
AVX
Motorola
Motorola
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
body diode
L1
C3
0.1µF
U1
8
MBRA140
D1
1
2.0V to 3.1V
2 Cell
Q1
Si9434
47µH
V
OU T
5V/100mA
D3
1N4148
IN
C4
R1
0.1µF 100k
D2
1N4148
C1
100µF
10V
7
MIC2570
SYNC
SW
5V
GND
2
4
C2
220µF
10V
U1
C1
C2
D1
D2
D3
L1
Q1
Micrel
AVX
AVX
Motorola
Motorola
Motorola
Coilcraft
Siliconix
MIC2570-1BM
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
MBRA140T3
MBRS130LT3
MBRS130LT3
DO3316P-473 DCR = 0.12
Si9434 PMOS
Example 14. Improved Reversed-Battery Protected Regulator
MIC2570
12
August 2007
MICREL [ MICREL SEMICONDUCTOR ]
