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PDF SP6831TR Data sheet ( Hoja de datos )
| Número de pieza | SP6831TR | |
| Descripción | Low Power Voltage Inverters With Shutdown | |
| Fabricantes | Sipex | |
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® 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 <1µA 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 <1µA 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.
VOUT 1
VIN 2
C1- 3
SP6830
SP6831
6 C1+
5 SHDN
4 GND
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
1
© Copyright 2000 Sipex Corporation
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = +5.0V, C1 = C2 = C3 = 3.3µF for SP6830, C1 = C2 = C3 = 1µF for SP6831, and TAMB = 25OC 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
40
30
20
10
0
-40
-15 10 35 60
Temperature(C)
85
175
150
125
100
75
50
25
0
-40 -15 10 35 60
Temperature(C)
85
Figure 6. Charge Pump Freqency vs. Temperature for
the SP6830
Figure 7. Charge Pump Freqency vs. Temperature for
the SP6831
125
100
75
50
25
0
2 2.5 3 3.5 4 4.5 5 5.5
Supply Voltage(V)
300
250
200
150
100
50
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
5
© Copyright 2000 Sipex Corporation
5 Page 
and POUT is the the power output. Both efficiencies
are provided to designers for comparison.
APPLICATION INFORMATION
For the following applications, C1 = C2 = C3 =
3.3µF for the SP6830 and C1 = C2 = C3 = 1.0µF
for the SP6831.
Capacitor Selection
Low ESR capacitors are needed to obtain low
output resistance. Refer to Table 1 for some
suggested low ESR capacitors. The output
resistance of the SP6830/6831 devices is a
function of the ESR of C1 and C2. This output
resistance can be determined by the equation
previously provided in the Efficiency section:
ROUT ≈ 4 x (2 x RSWITCHES + ESRC1) +
ESRC2 +
1
fOSC x C1
,
where ROUT is the circuit's output resistance,
RSWITCHES is the internal resistance of the MOSFET
switches, ESRC1 and ESRC2 are the ESR of their
respective capacitors, and fOSC is the oscillator
frequency. This term with fOSC is derived from an
ideal switched-capacitor circuit as seen in Figure
19.
Minimizing the ESR of C1 and C2 will minimize
the total output resistance and will improve the
efficiency.
Flying Capacitor
Decreasing flying capacitor, C1, values will
increase the output resistance of the SP6830/
6831 devices while increasing C1 will reduce the
output resistance. There is a point where
increasing C1 will have a negligible effect on the
output resistance due to the the domination of the
output resistance by the internal MOSFET switch
resistance and the total capacitor ESR.
Output Capacitor
Increasing output capacitor, C2, values will
decrease the output ripple voltage. Reducing the
ESR of C2 will reduce both output ripple voltage
and output resistance. If higher output ripple can
be tolerated in designs, smaller capacitance values
for C2 should be used with light loads. The
following equation can be used to calculate the
peak-to-peak ripple voltage:
VRIPPLE = 2 x IOUT x ESRC2 +
IOUT
fOSC x C2 .
Input Bypass Capacitor
The bypass capacitor at the input voltage will
reduce AC impedance and the impact of any of
the SP6830/6831 device's switching noise. It is
recommended that for heavy loads a bypass
capacitor approximately equal to the flying
capacitor, C1, be used. For light loads, the value
of the bypass capacitor can be reduced.
SIPEX PART MANUFACTURER/
NUMBER
TELEPHONE #
PART NUMBER
CAPACITANCE / MAX ESR CAPACITOR
VOLTAGE
@ 100kHz SIZE/TYPE
SP6830
KEMET /
864-963-6300
T494B335*020
3.3µF / 20V
1.5Ω
Case B /
Tantalum
SP6830
SPRAGUE /
207-324-4140
595D335X0035
3.3µF / 35V
2.0Ω
Case C /
Tantalum
SP6830
TDK /
847-803-6100
C3216X5R1A335K
3.3µF / 10V
0.04Ω
1206 / X5R
SP6831
AVX /
843-448-9411
0805ZC105K
1µF / 10V
0.04Ω
0805 / X7R
SP6831
KEMET/
864-963-6300
C0805C105KRAC
1µF / 10V
0.05Ω
0805 / X7R
SP6831
TDK /
847-803-6100
C2012X5R1A105K
Table 1. Suggested Low ESR Surface Mount Capacitors
1µF / 10V
0.05Ω
0805 / X5R
Rev. 9-22-00
SP6830/6831 Low Power Voltage Inverters With Shutdown
11
© Copyright 2000 Sipex Corporation
11 Page | ||
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