Regulated, Adjustable -2x
Inverting Charge Pump
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.3V, C1 = C2 = 0.22µF, C
IN
= 1µF, C
OUT
= 10µF,
T
A
= -40°C to +85°C,
unless otherwise noted. (Note 1)
PARAMETER
Supply-Voltage Range
Supply Current
Shutdown Current
Oscillator Frequency
Open-Loop Output
Resistance
FB Trip Point
FB Input Bias Current
SHDN
Input Threshold
SHDN
Input Bias Current
V
IL
V
IH
SYMBOL
V
IN
I
IN
I
IN,SHDN
f
OSC
R
OUT
R
L
= 3kΩ to GND
No load, V
FB
= -50mV
No load,
SHDN
= GND
V
FB
= 50mV
I
OUT
= 5mA, FB = IN
SHDN
= GND (OUT pulls to GND)
V
IN
= 1.8V to 5.5V
V
IN
= 1.8V to 5.5V
V
IN
= 1.8V to 5.5V
V
IN
= 5.5V,
SHDN
= IN or GND
-40
-100
0.3V
IN
0.7V
IN
-100
100
270
CONDITIONS
MIN
1.8
TYP
MAX
5.5
55
1
630
125
50
40
100
UNITS
V
µA
µA
kHz
Ω
mV
nA
V
nA
MAX868
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
__________________________________________Typical Operating Characteristics
(Circuit of Figure 5, T
A
= +25°C, unless otherwise noted.)
LOAD-REGULATION ERROR
vs. LOAD CURRENT
(V
IN
= 5V)
MAX868-01
LOAD-REGULATION ERROR
vs. LOAD CURRENT
(V
IN
= 3.3V)
MAX868-02
MAXIMUM SWITCHING FREQUENCY
vs. TEMPERATURE
MAXIMUM SWITCHING FREQUENCY (kHz)
490
480
470
460
450
440
430
420
410
400
-40
-20
V
IN
= 2V
0
20
40
60
80
100
V
IN
= 3.3V
V
IN
= 5V
FB = IN
MAX868-03
5
LOAD-REGULATION ERROR (mV)
0
-5
-10
V
OUT
= -7.5V
-15
-20
V
OUT
= -3.3V
-25
-30
-35
0
5
V
OUT
= -5V
3
LOAD-REGULATION ERROR (mV)
0
-3
-6
-9
-12
-15
V
OUT
= -5V
500
V
OUT
= -3.3V
10 15 20 25 30 35 40 45 50
LOAD CURRENT (mA)
0
5
10
15
20
25
LOAD CURRENT (mA)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
