MIC2570_11 Datasheet, PDF (9/15 Pages) MIC GROUP RECTIFIERS – Two-Cell Switching Regulator

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