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