MIC4832
Low-Noise 220VPP EL Driver
Features
General Description
•
•
•
•
•
•
•
•
•
•
The
MIC4832
is
a
low-noise
220VPP
electroluminescent lamp (EL) driver. Using advanced
Bipolar, CMOS, and DMOS (BCD) technology, the
MIC4832 integrates a high voltage boost converter and
an H-bridge driver for driving a large EL lamp.
1.8V to 5.5V DC Input Voltage
220VPP Output Voltage Capable
Low Audible Noise EL Drive Waveform
Supports EL Panel Sizes up to 3 in2 (19 cm2)
Low 45 µA Operating Supply Current
Small Inductor Size with Low Profile (220 µH)
Tiny 8-Lead 3 mm x 3 mm DFN Package
Adjustable Boost Converter Frequency
Adjustable EL Lamp Frequency
10 nA Shutdown Current
Applications
•
•
•
•
•
•
•
•
LCD Panel Backlight
Mobile Phones
PDAs
Pagers
Calculators
Multimedia Players
Remote Controls
GPS Receivers
The MIC4832 can drive large-panel displays for mobile
phones, multimedia players, or automotive electronics
where EL panels are used for backlighting.
The MIC4832 also offers design flexibility with
adjustable lamp and boost converter frequencies,
simply by applying external resistors. A new H-bridge
design reduces audible noise by creating smoother AC
voltage across the EL panel.
The MIC4832 is offered in a 3 mm x 3 mm DFN and
MSOP-8 lead-free and RoHS-compliant packaging
with a –40°C to 85°C junction temperature range.
Package Types
MIC4832
8-Lead DFN (ML)
(Top View)
MIC4832
8-Lead MSOP (MM)
(Top View)
VDD
1
8
VA
VDD
1
8 VA
RSW
2
7
VB
RSW
2
7 VB
REL
3
6
CS
REL
3
6 CS
GND
4
5
SW
GND
4
5 SW
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 1
MIC4832
Typical Application Circuit
Low Noise EL Driver
220μH
BAS20W
VDD
Nȍ
2.2μF
3V - 4.2V
0ȍ
RSW
2.7nF
250V
SW
MIC4832
CS
REL
VA
GND
VB
EL LAMP
Functional Block Diagram
VIN
L1
1
CIN
D1
VDD
COUT
5
RSW
SW
2
RSW
Switch
Oscillator
6
CS
Q1
8
REL
VA
Q2
EL
Oscillator
VREF
EL LAMP
/Q3
7
VB
3
/Q4
REL
4
DS20006163B-page 2
GND
2019 - 2022 Microchip Technology Inc.
MIC4832
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VDD) ................................................................................................................................... –0.5V to +6V
Output Voltage (VCS) ............................................................................................................................... –0.5V to +120V
EL Lamp Terminals (VA, VB) .............................................................................................................................. VCS + 3V
Switch Voltage (VSW) ............................................................................................................................... –0.5V to +120V
Frequency Control Voltage (VRSW, VREL) ...................................................................................... –0.5V to (VDD + 0.3V)
ESD Rating (Note 1) .................................................................................................................................................. 2 kV
Operating Ratings ††
Supply Voltage (VDD) ................................................................................................................................ +1.8V to +5.5V
Lamp Drive Frequency (fEL).................................................................................................................. 60 Hz to 1000 Hz
Switching Frequency (fSW)...................................................................................................................65 kHz to 250 kHz
† Notice: Exceeding the absolute maximum ratings may damage the device.
†† Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 kΩ in series with
100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: VIN = VDD = 3.0V, RSW = 338 kΩ, REL = 1.78 MΩ. TA = +25°C unless otherwise
specified. Bold values valid for –40°C ≤ TA ≤ +85°C. Note 1
Parameter
Sym.
Min.
Typ.
Max.
Units
RDS(ON)
—
3.8
7
Ω
ISW = 100 mA
VCS
91
105
119
V
—
Enable Input Low Voltage
(Turn-Off)
VEN-L
—
—
0.5
V
VDD = 1.8V to 5.5V
Enable Input High Voltage
(Turn-On)
VEN-H
VDD –
0.5
—
—
V
VDD = 1.8V to 5.5V
Shutdown Current
ISD
—
0.01
0.5
µA
RSW Resistor = Low;
REL Resistor = Low; VDD = 5.5V
Input Supply Current
IVDD
—
45
75
µA
RSW Resistor = High;
REL Resistor = High;
VCS = 110V; VA, VB = OPEN
Input Current Including
Inductor
ICS
—
24
—
mA
VIN = VDD = 3.2V; RSW = 338 kΩ,
REL = 1.78 MΩ;
L = 220 µH; ROUT = 10 kΩ; Lamp = 2 in2
VA – VB Output Drive
Frequency
fEL
158
200
242
Hz
REL = 1.78 MΩ
Switching Transistor
Frequency
fSW
90
112
134
kHz
RSW = 338 kΩ
D
—
90
—
%
On-Resistance
CS Voltage Variation
Switching Transistor Duty
Cycle
Note 1:
Conditions
—
Specification for packaged product only.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 3
MIC4832
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
Storage Temperature Range
TS
–65
—
+150
°C
—
Ambient Temperature Range
TA
–40
—
+85
°C
—
Thermal Resistance 8-Lead DFN
JA
—
63
—
°C/W
—
Thermal Resistance MSOP-8
JA
—
206
—
°C/W
—
Temperature Ranges
Package Thermal Resistance
Note 1:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
DS20006163B-page 4
2019 - 2022 Microchip Technology Inc.
MIC4832
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
FIGURE 2-1:
SW Resistor.
Switching Frequency vs.
FIGURE 2-4:
Lamp Size.
Switching Frequency vs.
FIGURE 2-2:
Resistor.
EL Frequency vs. EL
FIGURE 2-5:
Voltage.
Total Input Current vs. Input
FIGURE 2-3:
Frequency.
Input Current vs. EL
FIGURE 2-6:
Voltage.
Peak CS Voltage vs. Input
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 5
MIC4832
FIGURE 2-7:
Input Voltage.
DS20006163B-page 6
Peak Output Voltage vs.
2019 - 2022 Microchip Technology Inc.
MIC4832
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
Description
1
VDD
Supply (Input): 1.8V to 5.5V for internal circuitry.
2
RSW
Switch Resistor (External Component): Set switch frequency of the internal power
MOSFET by connecting an external resistor to VDD. Connecting the external resistor to GND disables the switch oscillator and shuts down the device.
3
REL
EL Resistor (External Component): Set EL frequency of the internal H-Bridge driver
by connecting an external resistor to VDD. Connecting the external resistor to GND
disables the EL oscillator.
4
GND
5
SW
Switch Node (Input): Internal high-voltage power MOSFET drain.
6
CS
Regulated Boost Output (External Component): Connect to the output capacitor of
the boost regulator and connect to the cathode of the diode.
7
VB
EL Output: Connect to one end of the EL lamp. Polarity is not important.
8
VA
EL Output: Connect to one end of the EL lamp. Polarity is not important.
Ground.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 7
MIC4832
4.0
FUNCTIONAL DESCRIPTION
4.1
Overview
The MIC4832 is a high-voltage EL driver with an AC
output voltage of 220V peak-to-peak that’s capable of
driving EL lamps up to 3 in2. Input supply current for the
MIC4832 is typically 45 µA, reducing to 10 nA in
shutdown. The high voltage EL driver has two internal
oscillators to control the switching MOSFET and the
H-Bridge driver. Both of the internal oscillators’
frequencies can be individually programmed through
the external resistors to maximize the efficiency and
the brightness of the EL lamp.
4.2
4.3
Switching Frequency
The switching frequency of the converter is controlled
via an external resistor between the RSW pin and VDD
pin of the device. The switching frequency increases as
the resistor value decreases. For resistor value
selections, see Figure 2-1 or use Equation 4-1. The
switching frequency range is 65 kHz to 250 kHz, with
an accuracy of ±20%. In general, the lower the
switching frequency, the greater the input current is
drawn to deliver more power to the output. However,
the switching frequency should not be so low as to
allow the voltage at the switch node or the CS pin to go
beyond the absolute maximum voltage of those pins.
EQUATION 4-1:
Regulation
Referring to the Functional Block Diagram, initially
power is applied to VDD. The internal feedback voltage
is less than the reference voltage, causing the internal
comparator to go high, which then enables the
switching MOSFET’s oscillator.
When the switching MOSFET turns off, current flowing
into the inductor forces the voltage across the inductor
to reverse polarity. The voltage across the inductor
rises until the external diode conducts and clamps the
voltage at VOUT + VD1. The energy in the inductor is
then discharged into the COUT capacitor.
The internal comparator continues to turn the switching
MOSFET on and off until the internal feedback voltage
is above the reference voltage. Once the internal
feedback voltage is above the reference voltage, the
internal comparator turns off the switching MOSFET’s
oscillator.
When the EL oscillator is enabled, VA and VB switch in
opposite states to achieve a 220V peak-to-peak AC
output signal. The external resistor that connects to the
REL pin determines the EL frequency.
4.4
EL Frequency
The EL lamp frequency is controlled via an external
resistor connected between the REL pin and VDD pin
of the device. The lamp frequency increases as the
resistor value decreases. For resistor value selections,
see Figure 2-2 or use Equation 4-2. The EL lamp
frequency range is 60 Hz to 1000 Hz, with an accuracy
of ±20%.
EQUATION 4-2:
360
f EL Hz = -----------------------R EL M
VIN = 3.6V
VA
(50V/div)
When the switching MOSFET turns on, current flows
through the inductor and flows into the switch. The
switching MOSFET will typically turn on for 90% of the
switching period. During the on-time, energy is stored
in the inductor.
36
f SW kHz = -----------------------R SW M
IIN = 27mA
L = 220μH
COUT = 2.7nF
LAMP = 2 in2
RSW Nȍ
IIN = 17mA
L = 220μH
COUT = 2.7nF
VB
(50V/div)
VA
(50V/div)
VIN = 3.6V
REL 0ȍ
REL 0ȍ
VA - VB
(100V/div)
VB
(50V/div)
LAMP = 2 in2
RSW Nȍ
VA - VB
(100V/div)
Time (2ms/div)
FIGURE 4-2:
200 Hz Output Waveform.
Time (2ms/div)
FIGURE 4-1:
DS20006163B-page 8
100 Hz Output Waveform
2019 - 2022 Microchip Technology Inc.
MIC4832
In general, as the EL lamp frequency increases, the
amount of current drawn from the battery will increase.
The color of the EL lamp and the intensity are
dependent upon its frequency.
VA
(50V/div)
VIN = 3.6V
IIN = 21mA
L = 220μH
COUT = 2.7nF
VB
(50V/div)
LAMP = 1 in2
RSW Nȍ
VA - VB
(100V/div)
REL 0ȍ
Time (2ms/div)
FIGURE 4-3:
4.5
300 Hz Output Waveform.
Enable Function
The MIC4832 is disabled by connecting the external
resistor (RSW) to GND. This turns off the switch
oscillator of the boost converter. Connecting the
external resistor (RSW) to VDD enables the oscillator
and turns on the device. The enable voltage should rise
or fall monotonically without interruption.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 9
MIC4832
5.0
APPLICATION INFORMATION
5.1
Inductor
A 220 µH Murata (LQH4C221K04) inductor is
recommended for most applications. Generally,
inductors with smaller values can handle more current.
Lowering the inductance allows the boost regulator to
draw more input current to deliver more energy every
cycle. As a result, a lower value inductor may be used
to drive larger panels or make the current panel
brighter.
However, caution is required as using a low-value
inductor with a low switching frequency may result in
voltages exceeding the absolute maximum rating of
the switch node and/or the CS pin.
If the application uses a low-input voltage (1.8V to 3V),
a lower value inductor, such as 100 µH, may be used in
order to drive the EL lamp at max brightness without
issue.
5.2
Diode
The diode must have a high-reverse voltage (150V),
because the output voltage at the CS pin can reach up
to 130V. A fast-switching diode with lower forward
voltage and higher reverse voltage (150V), such as
BAV20WS/BAS20W, can be used to enhance
efficiency.
5.3
Output Capacitor
Low-ESR capacitors should be used at the regulated
boost output (CS pin) of the MIC4832 to minimize the
switching output ripple voltage. The larger the output
capacitance, the lower the output ripple at the CS pin.
The reduced output ripple at the CS pin, along with a
low-ESR capacitor, improves the efficiency of the
MIC4832 circuit.
Selection of the capacitor value will depend upon the
peak inductor current, inductor size, and the load. The
MIC4832 is designed for use with an output
capacitance as low as 2.2 nF. For minimum audible
noise, the use of a C0G/NPO dielectric output capacitor
is recommended.
TDK and AVX offer C0G/NPO dielectric capacitors in
capacitances up to 2.7 nF at 200V to 250V rating in
0805 size. If output ripple is a concern, a 0.01 µF/200V
X7R output capacitor is recommended.
5.4
EL Lamp Terminals (VA, VB)
An EL lamp is connected from VA to VB as the load.
The high voltage alternated across VA and VB by the
H-bridge cycles generate luminance.
The voltage at VA and VB should not exceed the
voltage at VCS by more than 3V. This situation may
become present when noisy enable signals such as
those often generated by mechanical switches are
applied to the driver’s inputs.
To prevent overvoltage at VA and VB, 10 kΩ resistors
may be placed in series from VA to the EL panel and
from VB to the EL panel. An alternative to the use of
10 kΩ resistors is to apply a diode from the CS pin to
VA and VB, where the cathode of the diode is on the CS
side and the anode is on the VA and VB side,
respectively.
DS20006163B-page 10
2019 - 2022 Microchip Technology Inc.
MIC4832
6.0
APPLICATION CIRCUIT
L1
220μH
3V - 4.2V
VDD
RSW
C1
2.2μF
RSW
REL
D1
BAS20W
C2
2.7nF
250V
SW
MIC4832
CS
REL
VA
GND
VB
EL LAMP
FIGURE 6-1:
TABLE 6-1:
RECOMMENDED RSW & REL VALUES FOR VARIOUS PANEL SIZES
Size
Cap.
—
—
0.4 in2
2 nF
1 in2
5 nF
2 in2
3 in2
Typical Li-Ion Powered MIC4832 Circuit.
10 nF
15 nF
Lamp
Freq.
REL
100 Hz
200 Hz
300 Hz
400 Hz
2.82 MΩ 1.69 MΩ
1.1 MΩ
0.837 MΩ 0.665 MΩ 0.562 MΩ 0.471 MΩ 0.409 MΩ 0.369 MΩ
252 kΩ
281 kΩ
257 kΩ
600 Hz
700 Hz
800 Hz
900 Hz
RSW
240 kΩ
269 kΩ
281 kΩ
—
—
fSW
150 kHz 143 kHz 132 kHz 128 kHz 116 kHz 105 kHz
98 kHz
—
—
—
295 kΩ
273 kΩ
500 Hz
RSW
257 kΩ
353 kΩ
—
—
—
—
—
fSW
140 kHz 122 kHz 102 kHz
—
—
—
—
—
—
RSW
300 kΩ
—
—
—
—
—
—
333 kΩ
—
fSW
120 kHz 108 kHz
—
—
—
—
—
—
—
RSW
313 kΩ
—
—
—
—
—
—
—
—
fSW
115 kHz
—
—
—
—
—
—
—
—
Table 6-1 applies to the circuit shown in Figure 6-1.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 11
MIC4832
7.0
PACKAGING INFORMATION
7.1
Package Marking Information
8-Lead MSOP*
Example
XXXX
XXX
4832
YMM
8-Lead DFN*
Example
Y
XXXX
NNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Y
4832
287
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
Note:
If the full seven-character YYWWNNN code cannot fit on the package, the following truncated codes are
used based on the available marking space:
6 Characters = YWWNNN; 5 Characters = WWNNN; 4 Characters = WNNN; 3 Characters = NNN; 2 Characters = NN; 1 Character = N
DS20006163B-page 12
2019 - 2022 Microchip Technology Inc.
MIC4832
8-Lead MSOP Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 13
MIC4832
8-Lead DFN Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
DS20006163B-page 14
2019 - 2022 Microchip Technology Inc.
MIC4832
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 15
MIC4832
NOTES:
DS20006163B-page 16
2019 - 2022 Microchip Technology Inc.
MIC4832
APPENDIX A:
REVISION HISTORY
Revision A (March 2019)
• Converted Micrel document MIC4832 to Microchip data sheet template DS20006163A.
• Minor grammatical text changes throughout.
Revision B (February 2022)
• Corrected package marking drawing in
Section 7.1, Package Marking Information and
added note to legend.
2019 - 2022 Microchip Technology Inc.
DS20006163B-page 17
MIC4832
NOTES:
DS20006163B-page 18
2019 - 2022 Microchip Technology Inc.
MIC4832
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Device
X
XX
-XX
Part No.
Junction Temp.
Range
Package
Media Type
Device:
MIC4832:
Junction
Temperature
Range:
Y
=
–40°C to +85°C, Industrial
Package:
MM =
ML =
8-Lead MSOP
8-Lead 3 mm x 3 mm DFN
Media Type:
= 100/Tube (MM Package)
TR =
2,500/Reel (MM Package)
TR =
5,000/Reel (ML Package)
Low Noise 220VPP EL Driver
2019 - 2022 Microchip Technology Inc.
Examples:
a) MIC4832YMM:
MIC4832, –40°C to +85°C
Temperature Range, 8-Lead
MSOP, 100/Tube
b) MIC4832YMM-TR:
MIC4832, –40°C to +85°C
Temperature Range, 8-Lead
MSOP, 2,500/Reel
c) MIC4832YML-TR:
MIC4832, –40°C to +85°C
Temperature Range, 8-Lead
3 mm x 3 mm DFN,
5,000/Reel
Note 1:
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006163B-page 19
MIC4832
NOTES:
DS20006163B-page 20
2019 - 2022 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip products:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not
mean that we are guaranteeing the product is “unbreakable”. Code protection is constantly evolving. Microchip is committed to
continuously improving the code protection features of our products.
This publication and the information herein may be used only
with Microchip products, including to design, test, and integrate
Microchip products with your application. Use of this information in any other manner violates these terms. Information
regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your
specifications. Contact your local Microchip sales office for
additional support or, obtain additional support at https://
www.microchip.com/en-us/support/design-help/client-supportservices.
THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS".
MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
WRITTEN OR ORAL, STATUTORY OR OTHERWISE,
RELATED TO THE INFORMATION INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
PARTICULAR PURPOSE, OR WARRANTIES RELATED TO
ITS CONDITION, QUALITY, OR PERFORMANCE.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL, OR CONSEQUENTIAL LOSS, DAMAGE, COST, OR EXPENSE OF ANY
KIND WHATSOEVER RELATED TO THE INFORMATION OR
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BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES
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OR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IF
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Endurance, TSHARC, USBCheck, VariSense, VectorBlox, VeriPHY,
ViewSpan, WiperLock, XpressConnect, and ZENA are trademarks
of Microchip Technology Incorporated in the U.S.A. and other
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SQTP is a service mark of Microchip Technology Incorporated in
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The Adaptec logo, Frequency on Demand, Silicon Storage
Technology, Symmcom, and Trusted Time are registered
trademarks of Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany
II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in
other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2019 - 2022, Microchip Technology Incorporated and its subsidiaries.
All Rights Reserved.
For information regarding Microchip’s Quality Management Systems,
please visit www.microchip.com/quality.
2019 - 2022 Microchip Technology Inc. and its subsidiaries.
ISBN: 978-1-5224-9746-2
DS20006163B-page 21
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://www.microchip.com/
support
Web Address:
www.microchip.com
Australia - Sydney
Tel: 61-2-9868-6733
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Tel: 91-80-3090-4444
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Fax: 43-7242-2244-393
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DS20006163B-page 22
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2019 - 2022 Microchip Technology Inc. and its subsidiaries.
09/14/21
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