SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

SP782/784

Programmable Charge Pump

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.

DESCRIPTION...

+5V Only Low Power Voltage Conversion

Programmable Between

5V or

10V

Low Power Shutdown Mode

Applications

RS-232/RS-423 transceiver power supplies

LCD BIAS Generator

OP-Amp Power Supplies

+5V

GND

SP782

C1+

C2+

LATCH

+5V

GND

LATCH

SP784

C1+

C2+ (a)

C2+ (b)

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

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.

...........................................................................+7V

.........................................................................+11V

.........................................................................11V

Storage Temperature..........................-65°C to +150°C
Power Dissipation

16-pin Plastic DIP...........................1000mW
16-pin Plastic SOIC.........................1000mW

Package Derating:
16-pin Plastic DIP

....................................................62

C/W

16-pin Plastic SOIC

....................................................62

C/W

SP782 SPECIFICATIONS

Typical @ 25

C and V

= V

5% unless otherwise noted.

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SUPPLY CURRENT

CHARGE PUMP CAPACITORS: 1

= +5V, R

, V

= 2

= +5V, R

, V

= V

Shutdown I

= +5V, SD = V

POSITIVE CHARGE PUMP OUTPUT

CHARGE PUMP CAPACITORS: 1

Output)

+9.5

+9.8

+10.0

Volts

= +5V, D

= 0V, D

= 0V

+8.0

+8.5

Volts

= +5V, D

= 0V, D

= 0V

= 1k

Output)

+4.2

+4.5

+5.0

Volts

= +5V, D

= V

, D

= V

+4.2

+4.5

Volts

= +5V, D

= V

, D

= V

= 1k

NEGATIVE CHARGE PUMP OUTPUT

CHARGE PUMP CAPACITORS: 1

Output)

9.5

9.8

10.0

Volts

= +5V, D

= 0V, D

= 0V

8.0

8.5

Volts

= +5V, D

= 0V, D

= 0V

= 1k

Output)

4.2

4.5

5.0

Volts

= +5V, D

= V

, D

= V

4.0

4.2

Volts

= +5V, D

= V

, D

= V

= 1k

OSCILLATOR FREQUENCY

OSC

300

kHz

SD = 0V

VOLTAGE CONVERSION EFFICIENCY

(2X V

Output)

(2X V

Output)

= 1k

(2X V

Output)

(2X V

Output)

= 1k

POWER REQUIREMENTS
V

+4.75

+5.25

Volts

ENVIRONMENTAL AND MECHANICAL

Operating Temperature Range

+70

Storage Temperature Range

+150

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

ABSOLUTE MAXIMUM RATINGS

...........................................................................+7V

.........................................................................+11V

.........................................................................11V

Storage Temperature..........................-65°C to +150°C
Power Dissipation

16-pin Plastic DIP...........................1000mW
16-pin Plastic SOIC.........................1000mW

Package Derating:
16-pin Plastic DIP

....................................................62

C/W

16-pin Plastic SOIC

....................................................62

C/W

SP784 SPECIFICATIONS

Typical @ 25

C and V

= V

5% unless otherwise noted.

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SUPPLY CURRENT

CHARGE PUMP CAPACITORS: 10

= +5V, R

, V

= 2

= +5V, R

, V

= V

Shutdown I

= +5V, SD = V

POSITIVE CHARGE PUMP OUTPUT

CHARGE PUMP CAPACITORS: 10

Output)

+9.0

+9.8

+10.0

Volts

= +5V, D

= 0V, D

= 0V

+8.0

+9.5

Volts

= +5V, D

= 0V, D

= 0V

= 1k

Output)

+4.5

+4.8

+5.0

Volts

= +5V, D

= V

, D

= V

+4.2

+4.5

Volts

= +5V, D

= V

, D

= V

= 1k

NEGATIVE CHARGE PUMP OUTPUT

CHARGE PUMP CAPACITORS: 10

Output)

9.0

9.8

10.0

Volts

= +5V, D

= 0V, D

= 0V

8.0

9.5

Volts

= +5V, D

= 0V, D

= 0V

= 1k

Output)

4.2

4.5

5.0

Volts

= +5V, D

= V

, D

= V

4.0

4.2

Volts

= +5V, D

= V

, D

= V

= 1k

OSCILLATOR FREQUENCY

OSC

300

kHz

SD = 0V

VOLTAGE CONVERSION EFFICIENCY

(2X V

Output)

(2X V

Output)

= 1k

(2X V

Output)

(2X V

Output)

= 1k

POWER REQUIREMENTS

+4.75

+5.25

Volts

ENVIRONMENTAL AND MECHANICAL

Operating Temperature Range

+70

Storage Temperature Range

+150

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

AC CHARACTERISTICS*

(Typical @ 25

C and nominal supply voltages unless otherwise noted)

PARAMETER

MIN.

TYP.

MAX.

UNITS

CONDITIONS

SP782 POWER-UP DELAY TIME

10V OUTPUT

DVDD

; V

Power On Delay

1000

= 1k

DVSS

; V

Power-On Delay

1000

= 1k

5V OUTPUT

DVDD

; V

Power On Delay

= 1k

DVSS

; V

Power-On Delay

150

= 1k

SP782 OUTPUT DELAY TIME

SD1

; Switching Delay

1000

= 1k

from

10V to

SD2

; Switching Delay

500

= 1k

from

5V to

10V

SP784 POWER-UP DELAY TIME

10V OUTPUT

DVDD

; V

Power On Delay

= 1k

DVSS

; V

Power-On Delay

= 1k

5V OUTPUT

DVDD

; V

Power On Delay

= 1k

DVSS

; V

Power-On Delay

1000

= 1k

SP784 OUTPUT DELAY TIME

SD1

; Switching Delay

= 1k

from

10V to

SD2

; Switching Delay

= 1k

from

5V to

10V

* - Using the charge pump capacitor values specified in the previous pages for each device.

Figure 1. Charge Pump Waveforms

10V

+10V

(a)

(b)

+5V

GND

5V

GND

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

SP782 VDD vs IDD D0 = D1 = 0V VCC = 5.00V T = +25

40.00
35.00
30.00
25.00
20.00
15.00
10.00

5.00
0.00

IDD(milliamps)

5.00

5.50

6.00

6.50

7.00

7.50

8.00

8.50

9.00

9.50 10.00

VDD(volts)

10uF Curve

1uF Curve

0.1uF Curve

SP782 VSS vs ISS D0 = D1 = 0V VCC = 5.00V T = +25

0.00

-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00

ISS(milliamps)

VSS(volts)

10uF Curve

1uF Curve

0.1uF Curve

-5.00

-5.50

-6.00

-6.50

-7.00

-7.50

-8.00

-8.50

-9.00

-9.50

-10.00

SP782 LOAD vs VDD D0 = D1 = 0V VCC = 5.00V T = +25

10.00

9.00
8.00
7.00
6.00
5.00
4.00

VDD (volts)

VDD - 10uF
VDD - 1uF
VDD - 0.1uF

-4.00
-5.00
-6.00
-7.00
-8.00
-9.00

-10.00

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD(ohms)

VSS - 10uF
VSS - 1uF
VSS - 0.1uF

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD (ohms)

SP782 LOAD vs VSS D0 = D1 = 0V VCC = 5.00V T = +25

VSS (volts)

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

SP782 VDD vs IDD D0 = D1 = 5V VCC = 5.00V T = +25

40.00
35.00
30.00
25.00
20.00
15.00
10.00

5.00
0.00

IDD(milliamps)

4.20

4.25

4.30

4.35

4.40

4.45

4.50

4.55

4.60

4.65

VDD(volts)

10uF Curve

1uF Curve

0.1uF Curve

SP782 VSS vs ISS D0 = D1 = 5V VCC = 5.00V T = +25

0.00

-5.00

-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-45.00

ISS(milliamps)

VSS(volts)

10uF Curve

1uF Curve

0.1uF Curve

-3.50

-3.60

-3.70

-3.80

-3.90

-4.00

-4.10

-4.20

-4.30

-4.40

SP782 LOAD vs VDD D0 = D1 = 5V VCC = 5.00V T = +25

4.50
4.40
4.30
4.20
4.10
4.00

VDD (volts)

VDD - 10uF
VDD - 1uF
VDD - 0.1uF

-4.00
-4.10
-4.20
-4.30
-4.40
-4.50

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD(ohms)

VSS - 10uF
VSS - 1uF
VSS - 0.1uF

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD(ohms)

VSS (volts)

SP782 LOAD vs VSS D0 = D1 = 5V VCC = 5.00V T = +25

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

SP784 VDD vs IDD D0 = D1 = 0V VCC = 5.00V T = +25

40.00
35.00
30.00
25.00
20.00
15.00
10.00

5.00
0.00

IDD(milliamps)

5.00

5.50

6.00

6.50

7.00

7.50

8.00

8.50

9.00

9.50 10.00

VDD(volts)

10uF Curve

1uF Curve

0.1uF Curve

SP784 VSS vs ISS D0 = D1 = 0V VCC = 5.00V T = +25

0.00

-5.00

-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00

ISS(milliamps)

VSS(volts)

10uF Curve

1uF Curve

0.1uF Curve

-5.00

-5.50

-6.00

-6.50

-7.00

-7.50

-8.00

-8.50

-9.00

-9.50

-10.00

SP784 LOAD vs VDD D0 = D1 = 0V VCC = 5.00V T = +25

10.00

9.00
8.00
7.00
6.00
5.00
4.00

VDD (volts)

VDD - 10uF
VDD - 1uF
VDD - 0.1uF

-4.00
-5.00
-6.00
-7.00
-8.00
-9.00

-10.00

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

VSS - 10uF
VSS - 1uF
VSS - 0.1uF

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD(ohms)

VSS (volts)

LOAD(ohms)

SP784 LOAD vs VSS D0 = D1 = 0V VCC = 5.00V T = +25

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

SP784 VDD vs IDD D0 = D1 = 5V VCC = 5.00V T = +25

40.00
35.00
30.00
25.00
20.00
15.00
10.00

5.00
0.00

IDD(milliamps)

4.20

4.25

4.30

4.35

4.40

4.45

4.50

4.55

4.60

4.65

VDD(volts)

10uF Curve

1uF Curve

0.1uF Curve

SP784 VSS vs ISS D0 = D1 = 5V VCC = 5.00V T = +25

0.00

-5.00

-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00

ISS(milliamps)

VSS(volts)

10uF Curve

1uF Curve

0.1uF Curve

-3.50

-3.60

-3.70

-3.80

-3.90

-4.00

-4.10

-4.20

-4.30

-4.40

SP784 LOAD vs VDD D0 = D1 = 5V VCC = 5.00V T = +25

4.50
4.40
4.30
4.20
4.10
4.00

VDD (volts)

VDD - 10uF
VDD - 1uF
VDD - 0.1uF

-4.00
-4.10
-4.20
-4.30
-4.40
-4.50

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD(ohms)

VSS - 10uF
VSS - 1uF
VSS - 0.1uF

500

1000

1500

2000

2500

3000

3500 4000

4500

5000

LOAD(ohms)

VSS (volts)

SP784 LOAD vs VSS D0 = D1 = 5V VCC = 5.00V T = +25

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

receives a continuous charge from either C

or C

. With the C1 capacitor charged to 5V, the

cycle begins again.

Phase 3

-- V

charge storage -- The third phase of the

clock is identical to the first phase -- the charge
transferred in C

produces 5V in the negative

terminal of C

, which is applied to the negative

side of capacitor C

. Since C

is at +5V, the

voltage potential across C

is l0V. For the 5V

output, C

is connected to ground so that the

potential on C

is only +5V.

Phase 4

-- V

transfer -- The fourth phase of the

clock connects the negative terminal of C

ground and transfers the generated l0V or the
generated 5V across C

to C

, the V

storage

capacitor. Again, simultaneously with this, the
positive side of capacitor C

is switched to +5V

and the negative side is connected to ground,
and the cycle begins again.

Since both V

and V

are separately gener-

ated from V

in a noload condition, V

and

will be symmetrical. Older charge pump

approaches that generate V

from V

will show

a decrease in the magnitude of V

compared to

due to the inherent inefficiencies in the

design.

= +5V

+5V

Storage Capacitor

Figure 3. Charge Pump Phase 1 for

5V.

= +5V

+5V

Storage Capacitor

Figure 2. Charge Pump Phase 1 for

10V.

THEORY OF OPERATION

The SP782/784's charge pump design is based
on Sipex's original patented charge pump de-
sign (5,306,954) which uses a fourphase volt-
age shifting technique to attain symmetrical
10V power supplies. In addition, the SP782/
784 charge pump incorporates a "program-
mable" feature that produces an output of

10V

5V for V

and V

by two control pins, D0

and D1. The charge pump requires external
capacitors to store the charge. Figure 1 shows
the waveform found on the positive and nega-
tive side of capcitor C2. There is a freerunning
oscillator that controls the four phases of the
voltage shifting. A description of each phase
follows.

Phase 1 (

10V)

-- V

charge storage -- During this phase of

the clock cycle, the positive side of capacitors
C

and C

are initially charged to +5V. C

then switched to ground and the charge on C

is transferred to C

. Since C

is connected to

+5V, the voltage potential across capacitor C

is now 10V.

Phase 1 (

5V)

-- V

& V

charge storage and transfer --

With the C

and C

capacitors initially charged

to +5V, C

is then switched to ground and the

charge on C

is transferred to the V

storage

capacitor. Simultaneously the C

is switched

to ground and 5V charge on C

is transferred

to the V

storage capacitor.

Phase 2 (

10V)

-- V

transfer -- Phase two of the clock

connects the negative terminal of C

to the V

storage capacitor and the positive terminal of
C

to ground, and transfers the generated l0V

or the generated 5V to C

. Simultaneously,

the positive side of capacitor C

is switched to

+5V and the negative side is connected to
ground.

Phase 2 (

5V)

-- V

& V

charge storage -- C

reconnected to V

to recharge the C

capacitor. C

is switched to ground and C

connected to C

The 5V charge from Phase 1 is

now transferred to the V

storage capacitor.

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

Figure 4. Charge Pump Phase 2 for

10V.

The oscillator frequency or clock rate for
the charge pump is designed for low power
operation. The oscillator changes from a high
frequency mode (400kHz) to a low frequency
mode (20kHz) when the SD pin goes to a logic
"1". The lower frequency allows the

SP782/

SP784

to conserve power when the outputs are

not being used.

EFFICIENCY INFORMATION

A charge pump theoretically produces a doubled
voltage at 100% efficiency. However in the real
world, there is a small voltage drop on the output
which reduces the output efficiency. The SP782
and SP784 can usually run 99.9% efficient with-
out driving a load. While driving a 1k

load, the

SP782 and SP784 remain at least 90% efficient.

Total Output Voltage Efficiency =

[(V

OUT

+) / (2*V

)] + [(V

OUT

) / (2*V

)] ;

OUT

+ = 2*V

+ V

DROP

OUT

= 2*V

+ V

DROP

= (I)*(R

OUT

)

DROP

+ = (I+)*(R

OUT

Power Loss = I

OUT

*(V

DROP

)

The efficiency changes as the external charge
pump capacitors are varied. Larger capacitor
values will strengthen the output and reduce
output ripple usually found in all charge pumps.
Although smaller capacitors will cost less and

Figure 6. Charge Pump Phase 3.

= +5V

10V

Storage Capacitor

= +5V

+5V

Storage Capacitor

Figure 7. Charge Pump Phase 4.

Figure 5. Charge Pump Phase 2 for

5V.

= +5V

Storage Capacitor

= +5V

+10V

Storage Capacitor

save board space, lower values will reduce the
output drive capability.

The output voltage ripple is also affected by the
capacitors, specifically C3 and C4. Larger val-
ues will reduce the output ripple for a given load
of current. The current drawn from either output
is supplied by just the storage capacitor, C3 or
C4, during one half cycle of the internal oscilla-
tor. Note that the output current from the postive
charge pump is the load current plus the current
taken by the negative charge pump. Thus the
formula representation for the output ripple
voltage is:

RIPPLE

+ = {1 / (f

OSC

) * 1 / C3} * 0.5 * I

OUT

RIPPLE

= {1 / (f

OSC

) * 1 / C3} * 0.5 * I

OUT

To minimize the output ripple, the C3 and C4
storage capacitors can be increased to over 10

whereas the pump capacitors can range from
1

F to 5

Multiple SP782/784 charge pumps can be
connected in parallel. However, the output
resistance on both pump outputs will be
reduced. The effective output resistance is the
output resistance of one pump divided by the
number of charge pumps connected. It is
important to keep the C1 and C2 capacitors
separate for each charge pump. The storage
capacitors, C3 and C4, can be shared.

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

SHUTDOWN MODE

The internal oscillator of the SP782 and SP784
can be shutdown through the SD pin. In this
state, the V

and V

outputs are inactive and

the power supply current reduces to 10

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 V

and

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
V

6.0V as well as the V

requirement of

4.0V minimum with a 450

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 V

and V

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, V

= +5V and V

= -5V. All

other inputs to the control lines result in V

+10V and V

= -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

Figure 8. SP784 Application w/ SP524 Multi-Protocol Transceiver IC.

T1IN

T1OUTA

T2IN

R1INA

R1OUT

R2OUT

T1OUTB

T2OUTA

T2OUTB

R1INB

R2INA

R2INB

LOOPBA

CK P

THS

+5V

ENT1

ENT2

ENR1

ENR2

SP524

DP0

DP1

LATCH_EN

LOOPBCK

DECODER LOGIC

T3IN

T3OUTA
16

T4IN

R3INA

R3OUT

R4OUT

T3OUTB

T4OUTA

T4OUTB

R3INB

R4INA

R4INB

LOOPBA

CK P

THS

ENT3

ENT4

ENR3

ENR4

GND

+5V

GND

SP784

C1+

C2+ (a)

C2+ (b)

+10V

-10V

+10V

-10V

+10V

-10V

+5V

-5V

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

ALTERNATE

END PINS

(BOTH ENDS)

D1 = 0.005" min.

(0.127 min.)

PACKAGE:

16-PIN PLASTIC
DUALINLINE
(NARROW)

A1 = 0.015" min.

(0.381min.)

e = 0.100 BSC

(2.540 BSC)

= 0.300 BSC

(7.620 BSC)

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

/0.210

(/5.334)

0.115/0.195

(2.921/4.953)

0.014/0.022

(0.356/0.559)

0.045/0.070

(1.143/1.778)

0.008/0.014

(0.203/0.356)

0.780/0.800

(19.812/20.320)

0.300/0.325

(7.620/8.255)

0.240/0.280

(6.096/7.112)

0.115/0.150

(2.921/3.810)

/ 15

/15

)

16PIN

SP782/SP784 DS/08

SP782/784 Programmable Charge Pump

ORDERING INFORMATION

Model

Temperature Range

Package Types

SP782CP .......................................................................... 0

C to +70

C ..................................................................................... 16-pin Plastic DIP

SP784CP .......................................................................... 0

C to +70

C ..................................................................................... 16-pin Plastic DIP

SP782CT ........................................................................... 0

C to +70

C .............................................................................................. 16-pin SOIC

SP784CT ........................................................................... 0

C to +70

C .............................................................................................. 16-pin SOIC

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.

Corporation

SIGNAL PROCESSING EXCELLENCE

Please consult the factory for pricing and availability on a Tape-On-Reel option.

Sipex Corporation

Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com

Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SP782CT

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SP782CT