MIC2570
Micrel, Inc.
Application Examples
L1
47µH
C1
2.0V to 3.1V 100µF
2 Cells
10V
MBRA140
D1
1
V
OU T
5V/100mA
L1
47µH
C1
2.0V to 3.1V 100µF
2 Cells
10V
MBRA140
D1
1
V
OU T
3.3V/150mA
U1
8
U1
8
IN
MIC2570
IN
MIC2570
SW
5V
SW
4
SYNC
7
GND
2
C2
220µF
10V
3.3V
S Y N C GND
7
5
2
C2
330µF
6.3V
U1
C1
C2
D1
L1
Micrel
AVX
AVX
Motorola
Coilcraft
MIC2570-1BM
TPSD107M010R0100 Tantalum, ESR = 0.1Ω
TPSE227M010R0100 Tantalum, ESR = 0.1Ω
MBRA140T3
DO3316P-473, DCR = 0.12Ω
U1
C1
C2
D1
L1
Micrel
AVX
AVX
Motorola
Coilcraft
MIC2570-1BM
TPSD107M010R0100 Tantalum, ESR = 0.1Ω
TPSE337M006R0100 Tantalum, ESR = 0.1Ω
MBRA140T3
DO3316P-473, DCR = 0.12Ω
Example 1. 5V/100mA Regulator
Example 2. 3.3V/150mA Regulator
L1
50µH
L1
47µH
C1
2.0V to 3.1V 100µF
2 Cells
10V
MBRA140
D1
1
6
V
OU T
12V/40mA
C1
2.5V to 4.2V 100µF
1 Li Cell
10V
1
2
C2
100µF
10V
MBRA140
3
U1
8
IN
MIC2570
SW
R2
1M
1%
U1
8
D1
V
OU T
3.3V/80mA
IN
MIC2570
L1
SW
1
5
SYNC
7
FB
GND
2
C2
33µF
25V
4
R1
18.7k
1%
U1
C1
C2
C3
D1
L1
Micrel
AVX
AVX
AVX
Motorola
Coiltronics
3.3V
S Y N C GND
7
2
C3
330µF
6.3V
U1
C1
C2
D1
L1
Micrel
AVX
AVX
Motorola
Coilcraft
V
OU T
= 0.22V × (1+R2/R1)
MIC2570-2BM
TPSD107M010R0100 Tantalum, ESR = 0.11Ω
TPSE336M025R0300 Tantalum, ESR = 0.3Ω
MBRA140T3
DO3316P-473, DCR = 0.12Ω
MIC2570-1BM
TPSD107M010R0100 Tantalum, ESR = 0.1Ω
TPSD107M010R0100 Tantalum, ESR = 0.1Ω
TPSE337M006R0100 Tantalum, ESR = 0.1Ω
MBRA140T3
CTX50-4P DCR = 0.097Ω
Example 3. 12V/40mA Regulator
Example 4. Single Cell Lithium
to 3.3V/80mA Regulator
U2
6V
3
2
L1
47µH
U1
8
MBRA140
IN
EN
D1
1
6
OUT
MIC5203
4
C1
2.0V to 3.1V
100µF
2 Cells
10V
IN
MIC2570
SW
FB
R2
523k
1%
GND
1
C2
220µF
10V
V
OU T
5V/80mA
C3
1µF
16V
S Y N C GND
7
2
R1
20k
1%
V
OU T
= 0.22V × (1+R2/R1)
U1
U2
C1
C2
C3
D1
L1
Micrel
Micrel
AVX
AVX
Sprague
Motorola
Coilcraft
MIC2570-2BM
MIC5203-5.0BM4
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0300 Tantalum ESR = 0.1
Ω
293D105X0016A2W Tantalum
MBRA140T3
DO3316P-473 DCR = 0.12Ω
Example 5. Low-Noise 5V/80mA Regulator
August 2007
9
MIC2570
MICREL [ MICREL SEMICONDUCTOR ]
