MIC2571_02 Datasheet, PDF (10/12 Pages) Micrel Semiconductor – Single-Cell Switching Regulator

MIC2571
MIC2571
L1
D1
1V to 1.5V
1 Cell
C1*
47µF
16V
150µH
8
IN
SW ¹
MIC2571
5V ⁴
SYNC
7
GND
2
D2
MBR0530
C3 ^MBR0530
47µF
16V
* Needed if battery is more than 4" away from MIC2571 _D3
MBR0530
U1 Micrel
C1 Sprague
C2 Sprague
C3 Sprague
C4 Sprague
D1 Motorola
D2 Motorola
D3 Motorola
L1 Coilcraft
MIC2571-1BMM
594D476X0016C2T Tantalum ESR = 0.11Ω
594D476X0016C2T Tantalum ESR = 0.11Ω
594D476X0016C2T Tantalum ESR = 0.11Ω
594D476X0016C2T Tantalum ESR = 0.11Ω
MBR0530T1
MBR0530T1
MBR0530T1
DO1608C-154 DCR = 1.7Ω
R1
220k
C4
47µF
16V
Example 4. ±5V/2mA Regulator
V_OUT/+I_OUT
5V/2mA
C2
47µF
16V
–V_OUT/–I_OUT
–5V/2mA
–I_OUT ≤ +I_OUT
1V to 1.5V
1 Cell
L1
47µH
Q1
2N3906
D1
MBRA140
V_OUT
5V/15mA
C1
100µF
10V
R1
51k
8
IN
1
SW
MIC2571
4
5V
SYNC _GND
7
2
Minimum Start-Up Supply Voltage
V_IN = 1V, I_LOAD = 0A
V_IN = 1.2V, I_LOAD = 15mA
U1 Micrel MIC2571-1BMM
C1 AVX
TPSD107M010R0100 Tantalum ESR = 0.1Ω
C2 AVX
TPSD107M010R0100 Tantalum ESR = 0.1Ω
D1 Motorola MBRA140T3
L1 Coilcraft DO3308P-473 DCR = 0.32Ω
Example 5. 5V/15mA Regulator
C2
100µF
10V
1V to 1.5V
1 Cell
C1
47µF
16V
L1
150µH
8
IN
1
SW
MIC2571
FB ⁶
SYNC _GND
7
2
D1
MBR0530
D3
1N4148
C1
15µF
25V
R2
1.1M
1.1%
R1
20k
1%
C2
0.1µF
–V_OUT = – 0.22V (1+R2/R1) + 0.6V
D2
MBR0530
U1 Micrel MIC2571-2BM
C1 Sprague 594D476X0016C2T Tantalum ESR = 0.11Ω
C2 Sprague 594D156X0025C2T Tantalum ESR = 0.22Ω
C3 Sprague 594D156X0025C2T Tantalum ESR = 0.22Ω
D1 Motorola MBR0530T1
D2 Motorola MBR0530T1
L1 Coilcraft DO1608C-154 DCR = 1.7Ω
R3 ^C2
220k ^15µF
25V
Example 6. –12V/2mA Regulator
–V_OUT
–12V/2mA
10
Micrel
1997