CMOS Micropower Step-Up
Switching Regulator
INPUT, 9V BATTERY
R3
R4
100kΩ
100kΩ
IN914
500μH
1N914
POS OUT
NEG OUT
-12V, 15mA
+12V, 45mA
330μF
N.C.
150μF
R1
250μH
82kΩ
5
S
3
L
X
5
X
8
7
6
L
V
V
+V
+V
FB REF
S
7
6
4
I
C
V
FB
GND
R5
100kΩ
R2
10kΩ
MAX634
MAX630
4
GND
C
LBD
C
LBD LBR
X
X
3
2
2
8
1
150pF
100pF
47pF
R6
18kΩ
68pF
Figure 8. 12V Dual-Tracking Regulator
Table 2. Maxim DC-DC Converters
DEVICE
ICL7660
DESCRIPTION
Charge-Pump Voltage Inverter
DC-DC Boost Converter
DC-DC Boost Converter
DC-DC Boost Converter
DC-DC Boost Converter
DC-DC Boost Converter
DC-DC Voltage Inverter
DC-DC Voltage Inverter
DC-DC Voltage Inverter
DC-DC Voltage Inverter
DC-DC Voltage Inverter
DC-DC Voltage Step-Down
High-Power Boost Converter
High-Power Boost Converter
High-Power Boost Converter
INPUT VOLTAGE
1.5V to 10V
OUTPUT VOLTAGE
COMMENTS
-V
OUT
OUT
Not regulated
RC4193 2nd source
IN
MAX4193
MAX630
MAX631
MAX632
MAX633
MAX4391
MAX634
MAX635
MAX636
MAX637
MAX638
MAX641
MAX642
MAX643
2.4V to 16.5V
2.0V to 16.5V
1.5V to 5.6V
1.5V to 12.6V
1.5V to 15.6V
4V to 16.5V
V
V
> V
IN
> V
Improved RC4191 2nd source
Only 2 external components
Only 2 external components
Only 2 external components
RC4391 2nd source
Improved RC4391 2nd source
Only 3 external components
Only 3 external components
Only 3 external components
Only 3 external components
Drives external MOSFET
Drives external MOSFET
Drives external MOSFET
IN
+5V
+12V
+15V
Up to -20V
Up to -20V
-5V
2.3V to 16.5V
2.3V to 16.5V
2.3V to 16.5V
2.3V to 16.5V
3V to 16.5V
-12V
-15V
V
< V
IN
OUT
1.5V to 5.6V
1.5V to 12.6V
1.5V to 15.6V
+5V
+12V
+15V
12 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
