SP828/829
SIGNAL PROCESSING EXCELLENCE
High Efficiency Voltage Inverters
s
99.9% Voltage Conversion Efficiency
s
+1.5V to +5.5V Input Voltage Range
s
+1.25 V
IN
Guaranteed Start-up
s
Inverts Input Supply Voltage
s
Low EMI Voltage Inverter
s
50µA Quiescent Current for the
SP828
s
130µA Quiescent Current for the
SP829
s
25mA Output Current
s
Indefinite Output Short Circuit to GND
s
Low 20Ω Output Resistance
s
12kHz Operating Frequency for the
SP828
s
35kHz Operating Frequency for the
SP829
s
Pin Compatible Enhancement to
MAX 828/829, TC828/829
s
5-pin SOT23 Package
DESCRIPTION
The
SP828/829
devices are CMOS Charge Pump Voltage Inverters that can be
implemented in designs requiring a negative voltage from a +5V supply. The
SP828/829
devices are ideal for both battery-powered and board level voltage conversion
applications with a typical operating current of 50µA for the
SP828
and 130µA for the
SP829.
Both devices can output 25mA with a voltage drop of 500mV. These devices combine a low
quiescent current with high efficiency (>95% over most of its load-current range). The
SP828/829
provide a stable operating frequency, low output resistance and low EMI to enhance performance
of critical analog circuitry. The
SP828/829
devices are available in a space-saving 5-pin
SOT23 Package.
V
OUT
1
V
IN
2
C1- 3
SP828
SP829
5 C1+
4 GND
SP828DS/03
SP828/829 High Efficiency Voltage Inverters
© Copyright 1999 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
V
IN
......................................................................+7.0V
V
OUT
.....................................................................-7.0V
V
OUT
Short Circuit to GND.............................Indefinite
I
OUT
......................................................................50mA
Storage Temperature........................-65˚C to +150˚C
Power Dissipation per Package
5-pin SOT23 (derate 2.98 mW/
o
C above +70
o
C)..240mW
Lead Temperature (Soldering)..........................300
o
C
ESD Rating......................2kV Human Body Model
SPECIFICATIONS
V
IN
= +5.0V, C1=C2=10µF for the
SP828,
C1=C2=3.3µF for the
SP829,
and T
AMB
= -40°C to +85°C unless otherwise noted. Typical values are taken
specifically at T
AMB
=+25°C. Test Circuit
Figure 19
unless otherwise noted.
PARAMETER
Supply Voltage
Supply Current
MIN.
1.25
1.5
TYP.
1.0
1.0
50
MAX.
5.5
80
115
200
300
50
65
15.6
20
45.5
54.3
UNITS
V
CONDITIONS
R
L
=10k
Ω
, T
AMB
=+25° C, Note 1
R
L
=10k
Ω
, T
AMB
=-40° C to +85° C
SP828
, T
AMB
=+25° C, R
L
=
∞
SP828
, T
AMB
=-40° C to +85° C,
R
L
=
∞
SP829
, T
AMB
=+25° C, R
L
=
∞
SP829
, T
AMB
=-40° C to +85° C,
R
L
=
∞
I
OUT
=5mA, T
AMB
=+25° C
I
OUT
=5mA, T
AMB
=-40° C to +85° C
SP828
, T
AMB
=+25° C
SP828
, T
AMB
=-40° C to +85° C
SP829
, T
AMB
=+25° C
SP829
, T
AMB
=-40° C to +85° C
R
L
=
∞
R
L
=10k
Ω
, NOTE 2
R
L
=10k
Ω
, NOTE 3
IOUT = 10mA, NOTE 3
130
µA
Output Resistance
Oscillator Frequency
8.4
6
24.5
19
95
21
12
35
99.9
98
97
91
Ω
kHz
Voltage Conversion Efficiency
Power Efficiency (Ideal)
Power Efficiency (Actual)
%
%
%
NOTE 1:
V
OUT
= -V
IN
+200mV
NOTE 2:
Power Efficiency (Ideal) =
NOTE 3:
Power Efficiency (Actual) =
V
OUT
x I
OUT
-V
IN
x (-V
IN
/R
L
)
V
OUT
x I
OUT
V
IN
x I
IN
SP828DS/03
SP828/829 High Efficiency Voltage Inverters
© Copyright 1999 Sipex Corporation
2
PINOUT
PIN ASSIGNMENTS
Pin 1— V
OUT
— Inverting charge pump output.
V
OUT
1
V
IN
2
C1- 3
SP828
SP829
5 C1+
Pin 2 — V
IN
— Input to the positive power
supply.
Pin 3 — C1- — Negative terminal to the charge
pump capacitor.
Pin 4 — GND — Ground reference.
Pin 5 — C1+ — Positive terminal to the charge
pump capacitor.
4 GND
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, C1 = C2 = C3 = 10µF for
SP828,
C1 = C2 = C3 = 3.3µF for
SP829,
and T
AMB
= 25
o
C unless
otherwise noted. The
SP828/829
devices use the circuit found in
Figure 19
when obtaining the following typical
performance characteristics (unless otherwise noted).
80
70
60
R
OUT
(Ohm)
R
OUT
(Ohm)
90
80
70
60
50
40
30
20
10
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 1.5V
50
40
30
20
10
0
1.5
2.5
3.5
4.5
V
IN
(V)
5.5
0
-60
90
40
-10
o
Temperature ( C)
140
Figure 1. Output Resistance vs. Supply Voltage
Figure 2. Output Resistance vs. Temperature
SP828DS/03
SP828/829 High Efficiency Voltage Inverters
© Copyright 1999 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, C1 = C2 = C3 = 10µF for
SP828,
C1 = C2 = C3 = 3.3µF for
SP829,
and T
AMB
= 25
o
C unless
otherwise noted. The
SP828/829
devices use the circuit found in
Figure 19
when obtaining the following typical
performance characteristics (unless otherwise noted).
14
13
12
Pump Frequency (kHz)
40
f
OUT
(kHz)
11
10
9
8
7
6
0.5
1.5
2.5 3.5
V
IN
(V)
4.5
5.5
35
30
25
0.5
1.5
2.5 3.5 4.5 5.5
Supply Voltage (V)
Figure 3. Charge Pump Frequency vs. Supply Voltage
for the SP828
Figure 4. Charge Pump Frequency vs. Supply Voltage
for the SP829
15
V
IN
= 5.0V
14
41
39
V
IN
= 5.0V
Pump Frequency (kHz)
37
35
33
31
29
27
25
-50
50
0
Temperature (C)
100
V
IN
= 1.5V
V
IN
= 3.3V
f
OUT
(kHz)
13
V
IN
= 3.3V
V
IN
= 1.5V
12
11
-60
-10
90
40
o
Temperature ( C)
140
Figure 5. Charge Pump Frequency vs. Temperature
for the SP828
SP828DS/03
Figure 6. Charge Pump Frequency vs. Temperature
for the SP829
© Copyright 1999 Sipex Corporation
SP828/829 High Efficiency Voltage Inverters
4
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, C1 = C2 = C3 = 10µF for
SP828,
C1 = C2 = C3 = 3.3µF for
SP829,
and T
AMB
= 25
o
C unless
otherwise noted. The
SP828/829
devices use the circuit found in
Figure 19
when obtaining the following typical
performance characteristics (unless otherwise noted).
70
60
Output Current (mA)
V
IN
= 5.0V;
V
OUT
= -3.8V
Output Current (mA)
40
35
30
25
20
15
10
5
0
V
IN
= 2V;
V
OUT
= -1.5V
V
IN
= 3.3V;
V
OUT
= -2.5V
V
IN
= 5.0V;
V
OUT
= -3.8V
50
40
30
20
10
0
0
30
20
10
Capacitance (µF)
40
V
IN
= 2V;
V
OUT
= -1.5V
V
IN
= 3.3V;
V
OUT
= -2.5V
0
30
20
10
Capacitance (µF)
40
Figure 7. Output Current vs. Capacitance for the SP828
Figure 8. Output Current vs. Capacitance for the SP829
700
600
300
Output Ripple (mVp-p)
V
IN
= 5.0V;
V
OUT
= -3.8V
Output Ripple (mVp-p)
250
200
150
100
50
V
IN
= 5.0V;
V
OUT
= -3.8V
500
400
300
200
100
0
V
IN
= 3.3V;
V
OUT
= -2.5V
V
IN
= 2V;
V
OUT
= -1.5V
V
IN
= 3.3V;
V
OUT
= -2.5V
V
IN
= 2V;
V
OUT
= -1.5V
0
30
20
10
Capacitance (µF)
40
0
0
20
30
10
Capacitance (µF)
40
Figure 9. Output Voltage Ripple vs. Capacitance
for the SP828
SP828DS/03
Figure 10. Output Voltage Ripple vs. Capacitance
for the SP829
© Copyright 1999 Sipex Corporation
SP828/829 High Efficiency Voltage Inverters
5
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