© 2000 IMP, Inc. 408-432-9100/www.impweb.com 1
IMP803
IMP803
POWER MANAGEMENT
High-
High-VV
olt
olt
ag
ag
e EL Lam
e EL Lam
p Dr
p Driviverer
◆ GPS units/Pagers/Cellular phones
◆ PDAs/Handheld computers
◆ Safety illumination
◆ Portable instrumentation
◆ Battery-operated displays
◆ LCD modules
◆ Toys
◆ Low Power: 420µA typical VDDcurrent
◆ Wide operating voltage range - from 2.0V to 6.5V
◆ 180V peak-to-peak typical AC output voltage
◆ Large output load capability - drive lamps
with more than 30nF capacitance
◆ Adjustable output lamp frequency for control of
lamp color, lamp life, and power consumption
◆ Adjustable converter frequency to minimize
power consumption
◆ Device can be Enabled/Disabled
◆ Low quiescent current – 20nA (disabled)
◆ High-Voltage CMOS Process
◆ MicroSO package option
Key Features
Applications
–
+
803_01.eps
V
DD
1
L
X
4
C
S
3
V
A
7
V
B
6
R
SW-OSC
2
Switch
Oscillator
Regulation
Control
IMP803
Bridge
Output
Driver
Q
Q
Q
V
REF
Lamp Drive
Oscillator
C
GND
5
R
EL-OSC
8
Q
The IMP803 is an Electroluminescent (EL) lamp driver with the four EL
lamp driving functions on-chip. These are the switch-mode power supply, its high-frequency oscillator, the high-voltage H-bridge lamp driver
and its low-frequency oscillator. The IMP803 drives EL lamps of up to
30nF capacitance to high brightness; EL lamps with capacitances greater
than 30nF can be driven, but will be lower in light output. The typical
regulated output voltage that is applied to the EL lamp is 180V peak-topeak. The circuit requires few external components, a single inductor,
single diode, two capacitors and three resistors. Two of these resistors
set the frequency for two internal oscillators.
The IMP803 operates over a 2.0V to 6.5V supply voltage range. A
regulated, low-power source can supply the low quiescent current of the
IMP803. The inductor may be driven from an independent, unregulated
supply voltage in dual supply applications.
An internal circuit shuts down the switching regulator when the lamp
drive voltage reaches 180V peak-to-peak. This conserves power and
extends battery life.
The IMP803 is available in MicroSO and SO-8 packages and in die or
wafer form.
Block Diagram
IMP803
IMP803
2 408-432-9100/www.impweb.com © 2000 IMP, Inc.
Parameter Symbol Conditions Min Typ Max Units
ON-resistance of MOS Switch R
DS(ON)
I = 100mA 3.5 8 Ω
Output Voltage Regulation V
CS
VDD= 2.0 to 6.5V 80 90 100 V
Output Voltage Peak-to-peak (in regulation) VA-V
B
VDD= 2.0 to 6.5V 160 180 200 V
Quiescent VDDSupply Current, Disabled I
DDQ
V
RSW-OSC
< 100mV 20 200 nA
Input Current at VDDPin I
DD
VDD= 3.0V, See Figure 1 420 700 µA
Input Current at VDDPin I
DD
VDD= 5.0V, See Figure 2 500 750 µA
Input Current: IDDPlus Inductor Current I
IN
VDD= 3.0V, See Figure 1 20 31 mA
Output Voltage at V
CS
V
CS
VDD= 3.0V, See Figure 1 60 74 100 V
V
A-B
Output Drive Frequency f
EL
VDD= 3.0V, See Figure 1 300 370 430 Hz
Switching Frequency f
SW
VDD= 3.0V, See Figure 1 50 70 90 kHz
Switching Duty Cycle D
SW
VDD= 3.0V, See Figure 1 88 %
4L
X
3C
S
2R
SW-OSC
1V
DD
5 GND
6V
B
7V
A
8R
EL-OSC
803_02.eps
IMP803
SO/ MicroSO
Part Number Input Voltage Regulated Output Voltage Temperature Range Pins-Package
IMP803LG 2.0V to 6.5V Yes – 40°C to +85°C 8-SO
IMP803IMA 2.0V to 6.5V Yes – 40°C to +85°C 8-MicroSO
IMP803SX* 2.0V to 6.5V Yes 25°C Dice
IMP803/D1** 2.0V to 6.5V Yes 25°C Dice
VDD, V
RSW-OSC
and V
REL-OSC
. . . . . . . . . . . . . . . –0.5V to +7.0V
V
CS
, LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to +120V
Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . –65°C to +150°C
Power Dissipation (SO) . . . . . . . . . . . . . . . . . . 400mW
Power Dissipation (MicroSO) . . . . . . . . . . . . . 300mW
V
A
, VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to VCS(pin 3)
Unless otherwise noted, VDD= 3.0V, RSW= 750kΩ, REL= 2.0MΩ, and TA= 25°C.
Note: All voltages are referenced to GND.
These are stress ratings only and functional operation is not
implied. Exposure to absolute maximum ratings for prolonged
time periods may affect device reliability.
Pin Compatible With HV803 and IMP560
Ordering Information
Pin Configuration
Absolute Maximum Ratings
Electrical Characteristics
* Disable pad not active
** Disable pad active
Add /T to ordering part number for Tape and Reel.
IMP803
IMP803
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
3
Typical Characteristics
100
(mA)
IN
(V), I
CS
V
100
(mA)
IN
(V), I
CS
V
VCS, IIN vs. Inductor Value
80
60
40
20
0
0
V
CS
I
IN
200 600 800400 1000
Inductor (µH) 803_03.eps
V
L = 470µH
80
60
40
20
0
2.0
3.0 4.0 5.0 6.0
CS
V
= 3.0V
IN
IDD vs. V
800
L = 560µH
700
600
DD
(µA)
DD
500
I
400
300
2.0
, I
vs. V
IN
IN
V
CS
I
IN
V
(V)
IN
803_04.eps
100
(mA)
IN
(V), I
CS
V
80
60
40
20
0
L = 330µH
2.0
3.0 4.0 5.0 6.0
VDD (V)
V
, I
vs. V
CS
IN
IN
V
CS
I
IN
3.0 4.0 5.0 6.0
V
(V)
IN
803_6.eps
803_07.eps
100
80
60
(mA)
IN
40
(V), I
CS
V
20
0
2.0
V
, I
vs. V
CS
IN
L = 1mH
3.0 4.0 5.0 6.0
V
IN
IN
(V)
V
, I
vs. V
CS
IN
IN
100
L = 560µH
V
CS
I
IN
803_05.eps
80
60
(mA)
IN
40
(V), I
CS
V
20
0
2.0
3.0 4.0 5.0 6.0
VIN (V)
V
CS
In Regulation
I
IN
803_08.eps
IMP803
IMP803
4 408-432-9100/www.impweb.com © 2000 IMP, Inc.
Pin Descriptions
External Components
Pin Number Name Function
1V
DD
Positive voltage supply for the IMP803. Inductor L may be connected here or to a
separate unregulated supply.
2R
SW-OSC
Switch-mode resistor pin. Switching frequency is determined by an external resistor, RSW.
3C
S
Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the
voltage at CS.
4L
X
Connection to flyback inductance, L.
5 GND Ground pin.
6V
B
EL lamp drive. The lamp is connected in a high-voltage bridge circuit with VBproviding
the complementary connection to V
A
. The peak-to-peak AC voltage across the EL lamp is
thus two times VCS.
7V
A
EL lamp drive. (See above)
8R
EL-OSC
The EL lamp oscillator frequency setting pin. The oscillator frequency is controlled
by external resistor REL.
External Component Description and Selection Guide
Diode Catch diode. A fast reverse recovery diode, with BV > 100, such as a 1N4148.
Capacitor C
S
This is the high voltage capacitor that stores the inductive energy transferred through the
catch diode. A 100 volt capacitor between 10nF and 100nF is recommended.
Resistor R
EL
The EL lamp oscillator frequency setting resistor. This resistor, connected between the
R
EL-OSC
pin and VDD, provides an oscillator frequency inversely proportional to REL;
as RELincreases, the EL lamp frequency decreases along with the current drawn by the lamp.
Lamp color is also determined by this frequency. A 2MΩ resistor between the R
EL-OSC
pin and the
VDDsupply results in a lamp frequency around 350Hz: a 1MΩ resistor will give ≈700Hz.
Resistor R
SW
Switching Oscillator frequency setting resistor. The switching oscillator resistor is connected
between the R
SW-OSC
pin and the VDDsupply. The switching frequency is inversely proportional
to the resistor value, dropping as the resistance increases.
Inductor L The inductor provides the voltage boost needed by means of inductive “flyback”. The internal
MOSFET switch alternately opens and closes the ground connection for the inductor at the
LXpin. When this internal switch opens, the inductor potential will forward-bias the catch
diode and the current will pass through the storage capacitor CS, charging it to a high voltage.
Smaller inductors are preferred to prevent saturation. As the value of the inductor
increases (and the series DC resistance of the inductor decreases), the switching frequency
set by R
SW
should be increased to prevent saturation. In general, smaller value inductors that
can handle more current are more desirable when larger area EL lamps must be driven.
Lamp, R
CL
An external resistor (RCL) in series with the lamp will protect the output drivers from high transient
currents during lamp commutation.
The IMP803 generates high voltages and caution should
be exercised.
High Voltages Present
IMP803
IMP803
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
5
+
–
V
DD
R
SW-OSC
C
S
L
X
R
EL-OSC
V
A
V
B
GND
8
7
6
5
1
2
3
4
IMP803
2kΩ
2MΩ
R
EL
750kΩ
560µH
1
VIN = 3.0V
0.1µF
2
1N4148
L
10nF
Equivalent to
3 in
2
lamp
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω)
2. Larger values may be required depending upon supply impedance.
R
CL
803_09.eps
ON = V
DD
OFF = 0V
0.1µF
100V
R
SW
C
S
Figure 1. 3.0V Application
Test and Application Circuit, 3.0V
Figure 1 shows the IMP803 configured to drive a 3-square-inch
EL lamp, represented as a 10nF capacitor. With a 3.0V input, the
EL lamp will be driven to moderate brightness.
+
–
V
DD
R
SW-OSC
C
S
L
X
R
EL-OSC
V
A
V
B
GND
8
7
6
5
1
2
3
4
IMP803
2kΩ
2MΩ
R
EL
750kΩ
560µH
1
VIN = 5.0V
0.1µF
2
C
S
1N4148
6 in
2
lamp
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5
Ω
)
2. Larger values may be required depending upon supply impedance.
R
CL
803_10.eps
0.1µF
100V
ON = V
DD
OFF = 0V
R
SW
L
Figure 2. 5.0V Application
Test and Application Circuit, 5.0V
Figure 2 shows a 5.0V input application driving a 6-square-inch
EL lamp.
Application Information
IMP803
IMP803
6 408-432-9100/www.impweb.com © 2000 IMP, Inc.
+
–
V
DD
R
SW-OSC
C
S
L
X
R
EL-OSC
V
A
V
B
GND
8
7
6
5
1
2
3
4
IMP803
2kΩ
2MΩ
R
EL
330kΩ
560µH
1
VIN = 6.0V
0.1µF
2
1N4148
10 in
2
lamp
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω)
2. Larger values may be required depending upon supply impedance.
R
CL
803_11.eps
0.1µF
100V
L
R
SW
C
S
Enable/Disable Operation
Figure 4 shows that the IMP803 can be enabled via a logic gate that
connects R
SW
to VDD, and disabled by connecting it to ground.
RSWConnection IMP803 State
V
DD
Enabled
GND Disabled
Figure 3. 6.0V Application
Figure 4. Enable/Disable Operation
Test and Application Circut, 6.0V
At higher input voltage levels, the IMP803 will drive large EL
lamps. Figure 3 shows a 6.0V circuit configuration that will drive
a 10 square-inch lamp.
Enable/Disable Table
ON = V
DD
OFF = 0V
+
V
IN
–
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω)
2. Larger values may be required depending upon supply impedance.
0.1µF
CMOS
Gate
R
1
L
1N4148
SW
2
C
S
0.1µF
100V
R
EL
1
2
3
4
V
R
C
L
DD
SW-OSC
S
X
IMP803
R
EL-OSC
GND
8
R
V
7
A
V
6
B
CL
EL lamp
5
803_12.eps
IMP803
IMP803
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
7
Dual Supply Operation with 1.5V Battery
The IMP803 can also be operate from a single battery cell when a
regulated voltage higher than 2.0V is also available. This dual
supply configuration, shown in Figure 5, uses the regulated
voltage to operate the IMP803 while the energy for the highvoltage boost circuit comes from the battery.
The circuit of Figure 5 thus allows operation with batteries that are
below the 2V minimum specification or above the 6.0V maximum
operating voltage.
+
–
V
DD
R
SW-OSC
C
S
L
X
R
EL-OSC
V
A
V
B
GND
8
7
6
5
1
2
3
4
IMP803
R
CL
R
EL
Regulated Voltage
(2.0V to 6.5V)
R
SW
V
IN
L
Battery
Voltage
0.1µF
*
1N4148
EL lamp
803_13.eps
* Larger values may be required
depending upon supply impedance
ON = V
DD
OFF = 0V
0.1µF
100V
C
S
Figure 5. Dual Supply Operation
Switch Resistance
The IMP803 inductor switch resistance is typically below 3.5Ω, as
shown in Figure 6.
On Resistance (Ω)
VDD (V)
525_14.eps
1234567
0
5
10
15
20
25
30
Figure 6. Boost Switch On Resistance
IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: 408-432-9100
Fax: 408-434-0335
e-mail: info@impinc.com
http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc.
All other company and product names are trademarks of their respective owners.
©
2000 IMP, Inc.
Printed in USA
Publication #: 2006
Revision: B
Issue Date: 07/11/00
Type: Product
IMP803
IMP803
SO (8-Pin)
Package Dimensions
MicroSO (8-Pin)
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A350.0960.053.157.1
1A400.0010.001.052.0
B310.0020.033.015.0
C700.0010.091.052.0
e050.072.1
E051.0751.008.300.4
H822.0442.008.502.6
L610.0050.004.072.1
D981.0791.008.400.2
**)niP-8(OSorciM
A ––––– 3340.0 –––– 01.1
1A0200.09500.0050.051.0
2A5920.04730.057.059.0
b8900.07510.052.004.0
C1500.01900.031.032.0
D2411.00221.009.201.3
eCSB6520.0CSB56.0
ECSB391.0CSB09.4
1E2411.00221.009.201.3
L7510.06720.004.007.0
a °0 °6 °0 °6
AA210-SMgniwarDCEDEJ*
AA781-OMgniwarDCEDEJ**
3ta.10t_308
0°– 8°
L
H
E
D
A
e
B
A1
C
SO (8-Pin).eps
a
E1 E
D
A2
A
0.10mm
D
e
b
0.004in
A1
+
C
MicroSO (8-Pin).eps
L
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