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PDF SP6828EK Data sheet ( Hoja de datos )
| Número de pieza | SP6828EK | |
| Descripción | +3V Low Power Voltage Inverters | |
| Fabricantes | Sipex | |
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® 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 VIN 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.
VOUT 1
VIN 2
C1- 3
SP6828
SP6829
5 C1+
4 GND
SP6828DS/11
SP6828/6829 +3V Low Power Voltage Inverter
1
© Copyright 2000 Sipex Corporation
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = +3.3V, C1 = C2 = C3 = 10µF for SP6828, C1 = C2 = C3 = 3.3µF for SP6829, and TAMB = 25oC 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
13
12
11
10
9
8
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
VIN (V)
Figure 3. Charge Pump Frequency vs. Supply Voltage
for the SP6828
40
35
30
25
012 3 4
Supply Voltage (V)
Figure 4. Charge Pump Frequency vs. Supply Voltage
for the SP6829
15
14 VIN = 4.2V
13
VIN = 3.3V
12
11
VIN = 1.5V
10
9
8
-60 -40 -20 0 20 40 60 80 100
Temperature (oC)
41
VIN = 4.2V
39
37
VIN = 3.3V
35
33
VIN = 1.5V
31
29
27
25
-50
0 50
Temperature (OC)
100
Figure 5. Charge Pump Frequency vs. Temperature
for the SP6828
Figure 6. Charge Pump Frequency vs. Temperature
for the SP6829
SP6828DS/11
SP6828/6829 +3V Low Power Voltage Inverter
5
© Copyright 2000 Sipex Corporation
5 Page 
the charge pump capacitors, and PCONV is the total
conversion loss during charge transfer between
the flying and output capacitors. These are the
three theoretical factors that may effect the power
efficiency of the SP6828/6829 devices in designs.
Internal losses come from the power dissipated
in the IC's internal circuitry.
Losses in the charge pump capacitors will be
induced by the capacitors' ESR. The effects of
the ESR losses and the output resistance can be
found in the following equation:
I2
OUT
x
ROUT
=
PCAP
+
PCONV
and
R
OUT
≈
4
x
(2
x
R
SWITCHES
+
ESR )
C1
+
ESRC2 +
1
fOSC x C1
,
where IOUT is the output current, ROUT is the
circuit's output resistance, RSWITCHES is the internal
resistance of the MOSFET switches, ESR and
C1
ESR are the ESR of their respective capacitors,
C2
and f is the oscillator frequency. This term
OSC
with fOSC is derived from an ideal switched-
capacitor circuit as seen in Figure 22.
Conversion losses will happen during the charge
transfer between the flying capacitor, C1, and
the output capacitor, C2, when there is a voltage
difference between them. PCONV can be determined
by the following equation:
PCONV = fOSC x [ 1/2 x C1 x (VIN2 - VOUT2) +
1/ x C2 x (V 2 - 2 x V x V ) ].
2
RIPPLE
OUT
RIPPLE
Actual Efficiency
To determine the actual efficiency of the SP6828/
6829 device operation, a designer can use the
following equation:
Efficiency (ACTUAL) =
POUT
PIN
x 100% ,
where
POUT = VOUT x IOUT
and
PIN = VIN x IIN
where P is the power output, V is the
OUT
OUT
output voltage, IOUT is the output current, PIN is
the power from the supply driving the SP6828/
6829 devices, VIN is the supply input voltage, and
IIN is the supply input current.
Ideal Efficiency
The ideal efficiency is not the true power
efficiency because it is not calculated relative to
the input power which includes the input current
losses in the charge pump. The ideal efficiency
can be determined with the following equation:
Efficiency (IDEAL) =
POUT
POUT (IDEAL)
x 100% ,
where
POUT (IDEAL)
=
-VIN x
-VIN
RL
,
and POUT is the measured power output. Both
efficiencies are provided to designers for
comparison.
f
V+
VOUT
C1 C2 RL
Requivalent
V+
Requivalent
=
f
1
x C1
VOUT
C2 RL
SP6828DS/11
Figure 22. Equivalent Circuit for an Ideal Switched
Capacitor
SP6828/6829 +3V Low Power Voltage Inverter
11
© Copyright 2000 Sipex Corporation
11 Page | ||
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| PDF Descargar | [ Datasheet SP6828EK.PDF ] | |
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