Rainbow Electronics MAX679 User Manual
Page 2
MAX679
Regulated 3.3V Charge Pump
2
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
S HDN
= V
FSET
= 2V, C
IN
= 4.7µF, C1 = 0.33µF, C
OUT
= 10µF,
T
A
= -40°C to +85°C
, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)
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.
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
IN, OUT, SHDN, FSET to GND....................................-0.3V to 6V
PGND to GND.....................................................................±0.3V
C1- to GND ..................................................-0.3V to (V
IN
+ 0.3V)
C1+ to GND..............................................-0.3V to (V
OUT
+ 0.3V)
OUT Short to GND ..............................................................10sec
Continuous Power Dissipation (T
A
= +70°C)
µMAX (derate 4.1mW/°C above +70°C) .......................330mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
FSET = GND
FSET
,
SHDN = GND or V
IN
V
IN
= 2V, I
OUT
= 10mA
V
IN
= 3.6V
V
IN
= 1.8V
V
IN
= 1.8V, V
OUT
> 3.17V
V
IN
= 2.5V, FSET = IN or GND
V
OUT
= 3.6V, SHDN = GND
OUT = GND, V
IN
= 3.3V
V
IN
= 3.3V
FSET = IN
CONDITIONS
%
80
Efficiency
mA
100
200
Output Short-Circuit Current
kHz
700
1000
1300
V
0.8
1.6
V
1.8
3.6
Input Voltage
Input Undervoltage Lockout Voltage
260
330
450
Switching Frequency
µA
0.1
1
FSET, SHDN Input Leakage Current
V
0.7 x
0.5 x
V
IN
V
IN
FSET, SHDN Input Voltage High
V
0.5 x
0.3 x
V
IN
V
IN
FSET, SHDN Input Voltage Low
mA
20
Output Current
µA
50
80
No-Load Supply Current
µA
15
25
Leakage Current into OUT in Shutdown
µA
1
5
Supply Current in Shutdown
UNITS
MIN
TYP
MAX
PARAMETER
2V < V
IN
< 3.3V,
0mA < I
OUT
< 20mA
3.15
3.45
Output Voltage
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
V
3.17
3.3
3.43