®
SP6830/6831
Low Power Voltage Inverters With Shutdown
FEATURES
s
99.9% Voltage Conversion Efficiency
s
+1.15V to +5.3V Input Voltage Range
s
Inverts Input Supply Voltage
s
70µA Supply Current for the SP6830
s
200µA Supply Current for the SP6831
s
35kHz Operating Frequency for the
SP6830
s
120kHz Operating Frequency for the
SP6831
s
<1
µ
A Shutdown Current
s
6-pin SOT23-6 Package
s
Ideal for +3.6V Lithium Ion Battery
Applications
s
Reverse +3.6V Lithium Ion Battery
Protection
s
25mA Output Current
s
19Ω Output Resistance
APPLICATIONS
s
Small LCD Negative Bias Voltage
s
Power Amplifier Negative Bias Voltage
s
+5V to -5V Voltage Conversion
DESCRIPTION
The SP6830/6831 devices are CMOS Charge Pump Voltage Inverters that can be imple-
mented into designs which require a negative voltage from a battery voltage source as low as
+1.15V or a power supply rail voltage as high as +5.3V. The SP6830/6831 devices are ideal
for both battery-powered and board level voltage conversion applications with a typical
operating current of 70µA for the SP6830 and 200µA for the SP6831. These devices combine
an ultra-low shutdown current of <1
µ
A with high efficiency (>95% over most of its load-current
range) which are ideal for designs using batteries such as cell phones, PDAs, medical
instruments, and other portable equipment. The SP6830/6831 devices are available in a
space-saving 6-pin SOT23-6 Package.
V
OUT
1
V
IN
2
C1-
3
SP6830
SP6831
6 C1+
5 SHDN
4 GND
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
© 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
.........................................................-0.3V to +5.6V
V
OUT
......................................................-5.6V to +0.3V
I
OUT
......................................................................50mA
Storage Temperature.......................-65
O
C to +150
O
C
Lead Temperature (Soldering)..........................300
O
C
Power Dissipation Per Package
6-pin SOT (derate 4.35mW/
O
C above +70
O
C)............400mW
SPECIFICATIONS
V
IN
= +5V, C1=C2=C3=3.3µF for the
SP6830,
C1=C2=C3=1µF for the
SP6831,
and T
AMB
=-40°C to +85°C unless otherwise noted. Typical values are
taken specifically at T
AMB
=+25°C.
PARAMETER
Supply Voltage Range, V
DD
Supply Current, I
VIN
Guaranteed Start-up Voltage
Shutdown Input Voltage
HIGH
LOW
Shutdown Supply Current
Oscillator Frequency, f
OSC
Output Resistance
Voltage Conversion Efficiency
Power Efficiency (Ideal)
Power Efficiency (Actual)
MIN.
1.15
TYP.
MAX.
5.3
UNITS
V
µA
V
V
µA
kHz
Ω
%
%
%
R
L
= 1k
Ω
SP6830
SP6831
CONDITIONS
70
200
150
400
1.8
R
L
= 1k
Ω
, NOTE1
V
IN
= V
MIN
to V
MAX
V
IN
= V
MIN
to V
MAX
SHDN = GND, V
IN
= 5V, NOTE 2
SP6830
SP6831
I
OUT
= 5mA to 25mA, NOTE 3
R
L
= open
R
L
= 1k
Ω
, NOTE 4
R
L
= 1k
Ω
, NOTE 5
1.5
0.1
24.5
70
35
120
19
95
99.9
98
96
V
IN
0.5
1.0
56.3
200
45
Note 1: Minimum V
IN
required for V
O
= -V
IN
+0.2V.
Note 2: During the shutdown mode, V
IN
is disconnected from V
OUT.
Note 3: Capacitors are approximately 20% of the output impedance where ESR
=
1
f
OSC
x C
.
Note 4: Power Efficiency (Ideal) =
V
OUT
x I
OUT
-V
IN
x (-V
IN
/R
L
)
V
OUT
x I
OUT
V
IN
x I
IN
© Copyright 2000 Sipex Corporation
Note 5: Power Efficiency (Actual) =
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
2
PINOUT
PIN ASSIGNMENTS
Pin 1— V
OUT
— Inverting charge pump output.
V
OUT
1
V
IN
2
C1-
3
SP6830
SP6831
6 C1+
5 SHDN
4 GND
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 — SHDN — Active LOW Shutdown
input.
Pin 6 — C1+ — Positive terminal to the charge
pump capacitor.
V
IN
C3
2
V
IN
4-Phase
Clock
SD
ON
OFF
5 SHDN
Shutdown
SP6830
SP6831
C1+
6
C1
4 GND
Comparator
V
EE
*
Pump
Switches
V
OUT
SD
*V
EE
= the lower voltage of V
OUT
and GND
C1-
V
OUT
3
1
V
OUT
C2
R
L
DEVICE C1
SP6830
3.3µF
SP6831
1µF
C2
3.3µF
1µF
C3
3.3µF
1µF
f
OSC
35kHz
120kHz
Figure 1. Voltage Inverter Circuit for the SP6830/6831
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
© Copyright 2000 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, C1 = C2 = C3 = 3.3µF for
SP6830,
C1 = C2 = C3 = 1µF for
SP6831,
and T
AMB
= 25
O
C unless otherwise
noted. The
SP6830/6831
devices use the circuit found in
Figure 17
when obtaining the following typical
performance characteristics (unless otherwise noted).
40
35
30
25
20
15
10
5
0
-40
Output Resistance(Ohms)
30
25
20
15
10
5
0
2
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage(V)
Output Resistance(Ohms)
-15
10
35
60
85
Temperature(C)
Figure 2. Output Resistance vs. Supply Voltage
Figure 3. Output Resistance vs. Temperature
50
175
150
125
40
Frequency(kHz)
30
Frequency (kHz)
2
2.5
3
3.5
4
4.5
5
5.5
100
75
50
25
20
10
0
Supply Voltage(V)
0
2
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage(V)
Figure 4. Charge Pump Frequency vs. Supply Voltage
for the SP6830
Figure 5. Charge Pump Frequency vs. Supply Voltage
for the SP6831
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
© Copyright 2000 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
V
IN
= +5.0V, C1 = C2 = C3 = 3.3µF for
SP6830,
C1 = C2 = C3 = 1µF for
SP6831,
and T
AMB
= 25
O
C unless otherwise
noted. The
SP6830/6831
devices use the circuit found in
Figure 17
when obtaining the following typical
performance characteristics (unless otherwise noted).
50
175
150
40
Frequency (kHz)
Frequency (kHz)
125
100
75
50
25
30
20
10
0
-40
-15
10
35
60
85
Temperature(C)
0
-40
-15
10
35
60
85
Temperature(C)
Figure 6. Charge Pump Freqency vs. Temperature for
the SP6830
Figure 7. Charge Pump Freqency vs. Temperature for
the SP6831
125
300
100
250
Supply Current (mA)
Supply Current (µA)
2
2.5
3
3.5
4
4.5
5
5.5
75
200
150
100
50
50
25
0
Supply Voltage(V)
0
2
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage(V)
Figure 8. Supply Current vs. Supply Voltage for the
SP6830
Figure 9. Supply Current vs. Supply Voltage for the
SP6831
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
© Copyright 2000 Sipex Corporation
5