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PDF SP782CP Data sheet ( Hoja de datos )
| Número de pieza | SP782CP | |
| Descripción | Programmable Charge Pump | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP782CP (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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® SP782/784
Programmable Charge Pump
s +5V Only Low Power Voltage Conversion
s Programmable Between ±5V or ±10V
s Low Power Shutdown Mode
Applications
s RS-232/RS-423 transceiver power supplies
s LCD BIAS Generator
s OP-Amp Power Supplies
DESCRIPTION...
The SP782 and SP784 are monolithic programmable voltage converters that produce a
positive and negative voltage from a single supply. The SP782 and SP784 are programmable
such that the charge pump outputs either a ±10V voltage or a ±5V voltage by control of two
pins. Both products require four (4) charge pump capacitors to support the resulting output
voltages. The charge pump architecture (U.S. 5,760,637) is fabricated using a low power
BiCMOS process technology.
The SP782 and SP784 charge pumps can be powered from a single +5V supply. The low
power consumption makes these charge pumps ideal for battery operated equipment. Both
offer a shutdown feature that saves battery life. A system can essentially have four (4) different
supply voltages from a single battery. Typical applications are handheld instruments,
notebook and laptop computers, and data acquisition systems.
+5V
10µF
+
6 13 15
14 LATCH
C1+
VCC
SD
1µF
1 C1–
VDD 11
12 SP782
C2+
5 C2+
VSS 2
1µF
3 C2– GND
D0
D1
16 4
9
8
1µF
1µF
+5V
10µF
+
10µF
10µF
14
C1+
13
VCC
1 C1–
12
C2+ (b)
5 C2+ (a)
3 SP784
C2–
VDD 11
9 D0
8 D1
6 LATCH
SD
15
GND
16
VSS 2
4
10µF
10µF
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
1
© Copyright 2000 Sipex Corporation
1 page  
SP782
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
5.00 5.50
VDD vs IDD D0 = D1 = 0V
6.00 6.50 7.00 7.50
VDD(volts)
VCC = 5.00V T = +25OC
10uF Curve
1uF Curve
0.1uF Curve
8.00 8.50 9.00 9.50 10.00
0.00
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-10.00
SP782 VSS vs ISS D0 = D1 = 0V VCC = 5.00V T = +25OC
10uF Curve
1uF Curve
0.1uF Curve
-9.50 -9.00 -8.50 -8.00 -7.50 -7.00 -6.50 -6.00 -5.50
VSS(volts)
-5.00
10.00
9.00
8.00
7.00
6.00
5.00
4.00
0
SP782 LOAD vs VDD D0 = D1 = 0V VCC = 5.00V T = +25OC
VDD - 10uF
VDD - 1uF
VDD - 0.1uF
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
LOAD (ohms)
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
-10.00
0
SP782 LOAD vs VSS D0 = D1 = 0V VCC = 5.00V T = +25OC
VSS - 10uF
VSS - 1uF
VSS - 0.1uF
500 1000 1500 2000 2500 3000 3500 4000 4500 5000
LOAD(ohms)
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
5
© Copyright 2000 Sipex Corporation
5 Page 
SHUTDOWN MODE
The internal oscillator of the SP782 and SP784
can be shutdown through the SD pin. In this
state, the VDD and VSS outputs are inactive and
the power supply current reduces to 10µA.
LATCH ENABLE PIN
The SP782 and SP784 includes a control pin
(LAT) that latches the D0 and D1 control lines.
Connecting this pin to a logic HIGH state will
allow transparent operation of the D0 and D1
control lines. This input can be left floating
since there is an internal pull-up resistor which
will allow the latch to be transparent.
APPLICATIONS INFORMATION
The SP782 and SP784 can be used in various
applications where ±10V is needed from a +5V
source. Analog switches, op-amp power sup-
plies, and LCD biasing are some applications
where the charge pumps can be used.
The charge pump can also be used for supplying
voltage rails for RS-232 drivers needing ±12V.
The ±10V output from the charge pump is more
than adequate to provide the proper VOH and
VOL levels at the driver output.
Figure 8 shows how the SP784 can be used
in conjunction with the SP524 multiprotocol
transceiver IC. The programmability is ideal for
RS-232 and RS-423 levels. The RS-232 driver
output voltage swing ranges from ±5V to ±15V.
In order to meet this requirement, the charge
pump must generate ±10V to the transceiver IC.
The RS-423 driver output voltage range is
±4.0V to ±6.0V. When the SP524 transceiver is
programmed to RS-423 mode (V.10), the charge
pump now provides ±5V, through D0 and D1,
thus allowing the driver outputs to comply with
VOC ≤ 6.0V as well as the VT requirement of
±4.0V minimum with a 450Ω load to ground.
In older configurations, separate DC sources
needed to be configured or regulated down from
±10V to ±5V in a given application. A typical
charge pump providing VDD and VSS would
require external clamping such as 5V Zener
diodes. RS-423 (V.10) is usually found in
RS-449, EIA-530, EIA-530A, and V.36 modes.
When the control lines D0 and D1 are both at a
logic HIGH, VDD = +5V and VSS = -5V. All
other inputs to the control lines result in VDD =
+10V and VSS = -10V. Control of the SP784 in
an application with Sipex's SP524 can be found
in Figure 8.
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
11
© Copyright 2000 Sipex Corporation
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SP782CP.PDF ] | |
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