Datasheet

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