MIC2571
L1
150µH
8
Micrel
D1
C3 MBR0530
47µF
16V
V
OUT
/+I
OUT
5V/2mA
IN
1V to 1.5V
1 Cell
C1*
47µF
16V
MIC2571
SW
1
5V
SYNC
7
4
GND
2
C2
47µF
16V
D2
MBR0530
D3
MBR0530
R1
220k
C4
47µF
16V
–V
OUT
/–I
OUT
–5V/2mA
–I
OUT
≤
+I
OUT
* Needed if battery is more than 4" away from MIC2571
U1
C1
C2
C3
C4
D1
D2
D3
L1
Micrel
Sprague
Sprague
Sprague
Sprague
Motorola
Motorola
Motorola
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
Example 4.
±
5V/2mA Regulator
L1
1V to 1.5V
1 Cell
47µH
Q1
2N3906
D1
MBRA140
V
OUT
5V/15mA
C1
100µF
10V
8
R1
51k
IN
MIC2571
1
SW
5V
4
SYNC GND
7
2
C2
100µF
10V
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
L1
1V to 1.5V
1 Cell
8
D3
1N4148
1
150µH
IN
SW
FB
C1
15µF
25V
R2
1.1M
1.1%
C2
0.1µF
R1
20k
1%
C1
47µF
16V
MIC2571
6
SYNC GND
7
2
D1
MBR0530
–V
OUT
= – 0.22V
U1
C1
C2
C3
D1
D2
L1
Micrel
Sprague
Sprague
Sprague
Motorola
Motorola
Coilcraft
(1+R2/R1) + 0.6V
D2
MBR0530
R3
220k
MIC2571-2BM
594D476X0016C2T Tantalum ESR = 0.11Ω
594D156X0025C2T Tantalum ESR = 0.22Ω
594D156X0025C2T Tantalum ESR = 0.22Ω
MBR0530T1
MBR0530T1
DO1608C-154 DCR = 1.7Ω
C2
15µF
25V
–V
OUT
–12V/2mA
Example 6. –12V/2mA Regulator
MIC2571
10
1997
MIC [ MIC GROUP RECTIFIERS ]
