Low-Noise, Dual-Output, Regulated Charge Pump
for GaAsFET, LCD, and VCO Supplies
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3V, SYNC = IN, SETN = SETP = GND,
NSHDN
=
PSHDN
= IN, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C. See Figure 2.) (Note 1)
PARAMETER
SYNC
SYNC Frequency Range (external)
SYNC Duty Cycle (external)
Oscillator Frequency (internal)
SYNC Input Leakage Current
SET INPUT
Positive Set-Reference Voltage
Negative Set-Reference Voltage
I
POUT
= 0.1mA
I
NOUT
= 0.1mA
V
SETP
= V
SETN
= 1.3V
Percent of V
NOUT
, I
NOUT
= 5mA
I
SINK
= 2mA
V
RDY
= 10V
0.01
10
85
T
A
= +25°C
T
A
= -40°C to + 85°C
T
A
= +25°C
T
A
= -40°C to + 85°C
1.217
1.215
-1.270
-1.275
1.25
1.25
-1.25
-1.25
0.01
94
1.283
1.285
-1.230
-1.225
0.1
98
0.25
2
V
V
µA
%
V
µA
mA
SYNC = GND (divide by 4)
V
SYNC
= 3V
20
40
21.5
85
25
100
0.1
240
60
28.5
115
2
kHz
%
kHz
µA
CONDITIONS
MIN
TYP
MAX
UNITS
MAX768
RDY
OUTPUT
SETP, SETN Input Leakage Current
RDY
Output Threshold
Output Low Voltage
Output Off Current
Maximum Sink Current
Note 1:
Parameters to -40°C are guaranteed by design, not production tested.
Note 2:
Maximum output voltage range is from the positive reference voltage to 2 x V
IN
- dropout voltage.
Note 3:
Maximum output voltage range is from the negative reference voltage to -2 x V
IN
+ dropout voltage.
__________________________________________Typical Operating Characteristics
(SYNC = IN, T
A
= +25°C, unless otherwise noted.)
mV
RMS
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX768-TOC01
POUT OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX768-TOC02
NOUT OUTPUT VOLTAGE vs.
OUTPUT CURRENT
-4.3
OUTPUT VOLTAGE (V)
-4.4
-4.5
IN = 3.0V
-4.6
-4.7
-4.8
ONLY NOUT LOADED
MAX768-TOC03
0.30
IN = 3.0V
OUTPUT VOLTAGE (mV
RMS
)
5.2
ONLY POUT LOADED
5.0
OUTPUT VOLTAGE (V)
4.8
IN = 3.0V
4.6
4.4
4.2
IN = 4.0V
-4.2
0.20
NOUT = -5V
POUT = +5V
0.10
-4.9
-5.0
0
5
10
15
20
25
30
0
5
10
15
20
IN = 4.0V
25
30
0
0
5
10
15
20
25
OUTPUT CURRENT (mA)
4.0
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
