Regulated, Adjustable -2x
Inverting Charge Pump
MAX868
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
OUT to GND ...........................................................+0.3V to -12V
IN to OUT.................................................................-0.3V to -17V
C1+ to GND ........................................(V
IN
- 12V) to (V
IN
+ 0.3V)
C1- to GND.............................................................+0.3V to -12V
C2+ to GND ....................................................(V
IN
+ 0.3V) to -6V
C2- to GND...............................................................+0.3V to -6V
SHDN,
FB to GND .......................................-0.3V to (V
IN
+ 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
Output Current ....................................................................35mA
Short-Circuit Duration.................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range
MAX868EUB ....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.3V,
SHDN
= IN, C1 = C2 = 0.22µF, C
IN
= 1µF, C
OUT
= 10µF,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values
are at T
A
= +25°C.)
PARAMETER
Supply-Voltage Range
Supply Current
Shutdown Current
Oscillator Frequency
Closed-Loop Output
Resistance
Open-Loop Output
Resistance
FB Trip Point
Output Current
FB Input Bias Current
SHDN
Input Threshold
SHDN
Input Bias Current
V
IL
V
IH
I
OUT
SYMBOL
V
IN
I
IN
I
IN
,
SHDN
f
OSC
R
OUT,CL
R
L
= 3kΩ to GND
No load, V
FB
= -50mV
FB = IN
No load,
SHDN
= GND
V
FB
= 50mV
V
OUT
= -5V
I
OUT
= 5mA, FB = IN
T
A
= +25°C
T
A
= 0°C to +85°C
15
-30
-40
12
30
-50
0.3V
IN
0.7V
IN
-100
1
100
1
50
T
A
= +25°C
T
A
= 0°C to +85°C
V
IN
= 3.3V, V
OUT
= -5V
V
IN
= 5V, V
OUT
= -3.3V
T
A
= +25°C
T
A
= 0°C to +85°C
293
270
0.2
70
100
125
50
30
40
mV
mV
mA
nA
V
nA
Ω
CONDITIONS
MIN
1.8
30
5
0.1
450
1
607
630
TYP
MAX
5.5
50
UNITS
V
µA
mA
µA
kHz
Ω
R
OUT
SHDN
= GND (OUT pulls to GND)
V
IN
= 1.8V to 5.5V
Closed loop
V
IN
= 1.8V to 5.5V, T
A
= +25°C
V
IN
= 1.8V to 5.5V
V
IN
= 5.5V,
SHDN
= IN or GND
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
