Rainbow Electronics MAX868 User Manual
Page 2
MAX868
Regulated, Adjustable -2x
Inverting Charge Pump
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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.
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
FB = IN
No load, V
FB
= -50mV
R
L
= 3k
Ω
to GND
V
IN
= 5.5V, SHDN = IN or GND
V
IN
= 1.8V to 5.5V
SHDN = GND (OUT pulls to GND)
V
IN
= 1.8V to 5.5V, T
A
= +25°C
I
OUT
= 5mA, FB = IN
No load, SHDN = GND
V
FB
= 50mV
Closed loop
V
OUT
= -5V
CONDITIONS
nA
-100
1
100
SHDN Input Bias Current
V
0.7V
IN
V
IH
SHDN Input Threshold
0.3V
IN
V
IL
nA
-50
1
50
FB Input Bias Current
mA
30
I
OUT
Output Current
12
mA
5
I
IN
Supply Current
µA
30
50
V
1.8
5.5
V
IN
Supply-Voltage Range
mV
-30
30
15
50
R
OUT
Open-Loop Output
Resistance
Ω
125
70
100
µA
0.1
1
I
IN
,
SHDN
Shutdown Current
kHz
293
450
607
Oscillator Frequency
270
630
f
OSC
Ω
0.2
R
OUT,CL
Closed-Loop Output
Resistance
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
T
A
= +25°C
T
A
= 0°C to +85°C
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
V
IN
= 1.8V to 5.5V
mV
-40
40
FB Trip Point
T
A
= 0°C to +85°C
T
A
= +25°C