®
SP6828/6829
+3V Low Power Voltage Inverters
s
99.9% Voltage Conversion Efficiency
s
+1.15V to +4.2V Input Voltage Range
s
+1.15 V
IN
Guaranteed Start-up
s
Inverts Input Supply Voltage
s
20µA Quiescent Current for the
SP6828
s
40µA Quiescent Current for the
SP6829
s
25mA Output Current
s
12kHz Operating Frequency for the
SP6828
s
35kHz Operating Frequency for the
SP6829
s
Ideal for +3.6V Lithium Ion Battery
Applications
s
Reverse +3.6V Lithium Ion Battery
Protection
s
5-pin SOT23 Package
DESCRIPTION
The
SP6828/6829
devices are CMOS Charge Pump Voltage Inverters that can be
implemented in designs requiring a negative voltage from a +3V battery source. The
SP6828/
6829
devices are ideal for both battery-powered and board level voltage conversion
applications with a typical operating current of 20µA for the
SP6828
and 40µA for the
SP6829.
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), which is ideal
for designs using +3.3V or +3.6V lithium ion batteries. Applications include cell phones, PDAs,
medical instruments and other portable equipment. The
SP6828/6829
devices are available in
a space-saving 5-pin SOT23 Package.
V
OUT
1
V
IN
2
C1- 3
SP6828
SP6829
5 C1+
4 GND
SP6828DS/11
SP6828/6829 +3V Low Power Voltage Inverter
© Copyright 2000 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
...................................................................................................+4.5V
V
OUT
.................................................................................................-4.5V
V
OUT
Short Circuit to GND.................................................Indefinite
I
OUT
...................................................................................................50mA
Storage Temperature.....................................................-65˚C to +150˚C
Power Dissipation (T
AMB
=+70°C).................................................571mW
Lead Temperature (Soldering)....................................................300
o
C
ESD Rating...............................................2kV Human Body Model
SPECIFICATIONS FOR THE SP6828/6829
V
IN
= +3.3V, C1=C2=10µF for the
SP6828,
C1=C2=3.3µF for the
SP6829,
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.
1.15
1.4
TYP.
0.86
MAX.
4.2
UNITS
V
CONDITIONS
R
L
=10k
Ω
, T
AMB
=+25° C, Note 1
R
L
=10k
Ω
, T
AMB
=-40° C to +85° C
SP6828
, T
AMB
=+25° C, R
L
=
∞
SP6828
, T
AMB
=-40° C to +85° C,
R
L
=
∞
SP6829
, T
AMB
=+25° C, R
L
=
∞
SP6829
, 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
SP6828
, T
AMB
=+25° C
SP6828
, T
AMB
=-40° C to +85° C
SP6829
, T
AMB
=+25° C
SP6829
, T
AMB
=-40° C to +85° C
R
L
=
∞
R
L
=10k
Ω
, NOTE 2
R
L
=10k
Ω
, NOTE 3
I
OUT
= 10mA, NOTE 3
20
40
60
80
120
50
65
15.6
18
45.5
53
µA
40
Output Resistance
Oscillator Frequency
8.4
7
24.5
20
95
29
12
35
99.9
97
95
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
SP6828DS/11
SP6828/6829 +3V Low Power Voltage Inverter
© Copyright 2000 Sipex Corporation
2
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
....................................................................................................+6.0V
V
OUT
.................................................................................................-6.0V
V
OUT
Short Circuit to GND.................................................Indefinite
I
OUT
...................................................................................................50mA
Storage Temperature.....................................................-65˚C to +150˚C
Power Dissipation (T
AMB
=+70°C).........................................571mW
Lead Temperature (Soldering)......................................................300
o
C
ESD Rating..................................................2kV Human Body Model
SPECIFICATIONS FOR THE SP6828-5
V
IN
= +5.0V, C1=C2=10µF 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
Output Resistance
Oscillator Frequency
Voltage Conversion Efficiency
Power Efficiency (Ideal)
Power Efficiency (Actual)
MIN.
1.25
1.5
TYP.
0.86
50
24
MAX.
5.5
115
50
65
20
UNITS
V
µA
Ω
kHz
%
%
%
CONDITIONS
R
L
=10k
Ω
, T
AMB
=+25° C, Note 1
R
L
=10k
Ω
, T
AMB
=-40° C to +85° C
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
T
AMB
=-40° C to +85° C
R
L
=
∞
R
L
=10k
Ω
, NOTE 2
R
L
=10k
Ω
, NOTE 3
I
OUT
= 10mA, NOTE 3
6
95
99.9
98
91
94
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
SP6828DS/11
SP6828/6829 +3V Low Power Voltage Inverter
© Copyright 2000 Sipex Corporation
3
PINOUT
PIN ASSIGNMENTS
Pin 1— V
OUT
— Inverting charge pump output.
V
OUT
1
V
IN
2
C1- 3
SP6828
SP6829
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
= +3.3V, C1 = C2 = C3 = 10µF for
SP6828,
C1 = C2 = C3 = 3.3µF for
SP6829,
and T
AMB
= 25
o
C unless
otherwise noted. The
SP6828/6829
devices use the circuit found in
Figure 19
when obtaining the following typical
performance characteristics (unless otherwise noted).
60
50
70
65
60
55
50
45
40
35
30
25
V
IN
= 3.3V
V
IN
= 4.2V
0 20 40 60 80 100
Temperature (
o
C)
V
IN
= 1.5V
R
OUT
(Ohm)
30
20
10
0
1.5 2.0
R
OUT
(Ohm)
40
2.5 3.0
V
IN
(V)
3.5
4.0
20
-60 -40 -20
Figure 1. Output Resistance vs. Supply Voltage
Figure 2. Output Resistance vs. Temperature
SP6828DS/11
SP6828/6829 +3V Low Power Voltage Inverter
© Copyright 2000 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= +3.3V, C1 = C2 = C3 = 10µF for
SP6828,
C1 = C2 = C3 = 3.3µF for
SP6829,
and T
AMB
= 25
o
C unless
otherwise noted. The
SP6828/6829
devices use the circuit found in
Figure 19
when obtaining the following typical
performance characteristics (unless otherwise noted).
16
15
14
Pump Frequency (kHz)
40
f
OUT
(kHz)
13
12
11
10
9
8
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
V
IN
(V)
35
30
25
0
1
3
2
Supply Voltage (V)
4
Figure 3. Charge Pump Frequency vs. Supply Voltage
for the SP6828
Figure 4. Charge Pump Frequency vs. Supply Voltage
for the SP6829
15
14
13
V
IN
= 4.2V
41
39
V
IN
= 4.2V
Pump Frequency (kHz)
37
35
33
31
29
27
25
-50
50
0
Temperature ( C)
O
f
PUMP
(kHz)
V
IN
= 3.3V
V
IN
= 3.3V
12
11
V
IN
= 1.5V
10
9
8
-60 -40 -20
0 20 40 60 80 100
Temperature (
o
C)
V
IN
= 1.5V
100
Figure 5. Charge Pump Frequency vs. Temperature
for the SP6828
SP6828DS/11
Figure 6. Charge Pump Frequency vs. Temperature
for the SP6829
© Copyright 2000 Sipex Corporation
SP6828/6829 +3V Low Power Voltage Inverter
5
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