V
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(
Typical Operating Circuits
(inverter configuration), FSEL = LV = GND, V
IN
= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681), 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..............................................................................-0.3V to +6V
LV....................................................(V
OUT
- 0.3V) to (V
IN
+ 0.3V)
CAP+ ...........................................................-0.3V to (V
IN
+ 0.3V)
SHDN, FSEL ......................................(V
LV
- 0.3V) to (V
IN
+ 0.3V)
OUT, CAP-..................................................................-6V to 0.3V
Continuous Output Current ..............................................135mA
Output Short-Circuit Duration to GND (Note 1) ...................1sec
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.88mW/°C above +70°C)..........................471mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
I
LOAD
= 125mA
Inverter configuration,
R
L
= 1kΩ, LV = GND
LV = GND (Note 3)
FSEL = IN or LV
SHDN = IN
OUT = GND, SHDN = IN
CONDITIONS
375 500 625
750 1000 1250
94 125 156
187 250 313
4V
IH
V-3.75 -4.56V
LOAD
Output Voltage Under Load
(Note 2)
V
3.0 5.5
2.0 5.5
V
1V
IL
Shutdown, FSEL Thresholds
µA-1 1I
FSEL
Input Bias Current (FSEL)
Ω3.5 10R
OUT
Output Resistance (Note 2)
Ω1 5R
OUT(SHUT)
Output Resistance to Ground
in Shutdown
µA1I+
SHDN
Shutdown Current
µA-1 1I
SHDN
Input Bias Current (SHDN)
UNITSMIN TYP MAXSYMBOLPARAMETER
Doubler configuration,
R
L
= 1kΩ, LV = OUT
4.0 5.5
V
IN
2.5 5.5
Input Voltage Range
MAX1680
5.4
mA
10.8
FSEL = IN
(125kHz)
FSEL = LV
(250kHz)
MAX1681
21.6
43.2
I+
FSEL = IN
(500kHz)
Supply Current
FSEL = LV
(1MHz)
Note 1: Shorting OUT to IN may damage the device and should be avoided.
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
MAX1681
MAX1680
MAX1681
MAX1680
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
2.5 4.5
5 9
10 18
20 36
FSEL = LV
157 348
FSEL = IN
MAX1680
79 174
FSEL = LV
570 1490
kHz
FSEL = IN
MAX1681
f
OSC
Switching Frequency
285 745
