MIC2570 Datasheet, PDF (10/14 Pages) Micrel Semiconductor – Two-Cell Switching Regulator Preliminary Information

MIC2570
C1
2.0V to 3.1V 100µF
2 Cells
10V
L1
47µH
U1
8
IN
SW ¹
MIC2570
6
FB
SYNC GND
7
2
U2
D1
4.3V
3
IN
OUT ⁴
MBRA140
2
MIC5203
EN
R2
374k
1%
C2
220µF
GND
1
10V
R1
20k
1%
V_OUT = 0.22V (1+R2/R1)
V_OUT
3.3V/80mA
C3
1µF
16V
U1 Micrel
U2 Micrel
C1 AVX
C2 AVX
C3 Sprague
D1 Motorola
L1 Coilcraft
MIC2570-2BM
MIC5203-3.3BM4
TPSD107M010R0100 Tantalum ESR = 0.1Ω
TPSE227M010R0100 Tantalum ESR = 0.1Ω
293D105X0016A2W Tantalum
MBRA140T3
DO3316P-473 DCR = 0.12Ω
Example 6. Low-Noise 3.3V/80mA Regulator
C1
2.0V to 3.1V 100µF
2 Cells
16V
L1
47µH
U1
8
IN
1
SW
MIC2570
4
5V
SYNC GND
7
2
D2
MBRA140
MBRA140
D1
C3
220µF
10V
+V_OUT
5V/50mA
–I_OUT ≤ +I_OUT
C2
220µF
10V
U1 Micrel
C1 AVX
C2 AVX
C3 AVX
C4 AVX
D1 Motorola
D2 Motorola
D3 Motorola
L1 Coilcraft
MIC2570-1BM
TPSD107M010R0100 Tantalum, ESR = 0.1Ω
TPSE227M010R0100 Tantalum, ESR = 0.1Ω
TPSE227M010R0100 Tantalum, ESR = 0.1Ω
TPSE227M010R0100 Tantalum, ESR = 0.1Ω
MBRA140T3
MBRA140T3
MBRA140T3
DO3316P-473, DCR = 1.2Ω
D3
MBRA140
C4
220µF
10V
–V_OUT
–4.5V to –5V/50mA
Example 7. ±5V/50mA Regulator
2.0V to 3.1V
2 Cells
C1
100µF
10V
L1
47µH
U1
8
IN
1
SW
MIC2570
6
FB
SYNC GND
7
2
D1
MBRA140
D3
1N4148
C1
22µF
35V
R2
549k
1%
R1
4.99k
1%
C3
0.1µF
–V_OUT = –0.22V (1+R2/R1) + 0.6V
D2
MBRA140
R3
220k
C2
22µF
35V _–VOUT
U1 Micrel
C1 AVX
MIC2570-2BM
–24V/20mA
TPSD107M010R0100, Tantalum ESR = 0.1Ω
C2 AVX
TPSE226M035R0300, Tantalum ESR = 0.3Ω
C3 AVX
TPSE226M035R0300, Tantalum ESR = 0.3Ω
D1 Motorola MBRA140T3
D2 Motorola MBRA140T3
L1 Coilcraft DO3316P-473, DCR = 0.12Ω
Example 8. –24V/20mA Regulator
Micrel
4
1997
4-71