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MIC4827YMM-TR

P1-P3P4-P6P7-P9P10-P12P13-P15
MIC4827
Low Input Voltage, 180V
PP
Output Voltage,
EL Driver
General Description
Micrel’s MIC4827 is a high output voltage, DC to AC con-
verter, designed for driving EL (Electroluminescent) lamps.
The device operates from an input voltage range of 1.8V to
5.5V, making it suitable for 1-cell Li-Ion and 2- or 3-
cellalkaline/NiCad/NiMH battery applications. The
MIC4827 converts a low voltage DC input to a 180V
PP
AC
output signal that drives the EL lamp.
The MIC4827 is comprised of two stages: a boost stage,
and an H-bridge, lamp driver, stage. The boost stage steps
the input voltage up to +90V. The H-bridge stage then
alternately switches the +90V output to each terminal of
the EL lamp, thus creating a 180V
PP
AC signal to drive the
EL lamp and generate light.
The MIC4827 features separate oscillators for the boost-
and H-bridge stages. External resistors independently set
the operating frequency of each stage. This flexibility
allows the EL lamp circuit to be optimized for maximum
efficiency and brightness.
The MIC4827 uses a single inductor and a minimum
number of external components, making it ideal for
portable, space-sensitive applications.
The MIC4827 is available in an 8-pin MSOP package with
an ambient temperature range of –40°C to +85°C.
Features
• 1.8V to 5.5V DC input voltage
• 180V
PP
regulated AC output waveform
• Independently adjustable EL lamp frequency
• Independently adjustable boost converter frequency
• 0.1µA shutdown current
Applications
• LCD panel backlight
• Cellular phones
• PDAs
• Pager
• Calculators
• Remote controls
• Portable phones
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2009
M9999-070709-A
(408) 955-1690
332k
3.32M
C
OUT
0.033µF/100V
D1
BAV20WS
L1
220µH
2in
2
EL LAMP
15
6
8
7
2
3
4
SW
CS
VA
VB
VDD
RSW
REL
GND
MIC4827
C
IN
10µF
V
IN
TIME (2ms/div)
V
B
(50V/div)
V
A
(50V/div)
V
A
—
V
B
(50V/div)
High Voltage EL Driver
Micrel, Inc. MIC4827
July 2009 2
M9999-070709-A
(408) 955-1690
Ordering Information
Part Number
Standard Pb-Free
Ambient Temp. Range Package
MIC4827BMM MIC4827YMM –40° to +85°C 8-Pin MSOP
Pin Configuration
8-Pin MSOP (MM)
Pin Description
Pin Number Pin Name Pin Function
1 VDD Supply (Input): 1.8V to 5.5V.
2 RSW
Switcher 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 Ground Return.
5 SW Switch Node (Input): Internal high-voltage power MOSFET drain.
6 CS
Regulated Boost Output (External Component): Connect 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 the other end of the EL lamp. Polarity is not important.
Micrel, Inc. MIC4827
July 2009 3
M9999-070709-A
(408) 955-1690
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
)............................................–0.5 to 6V
Output Voltage (V
CS
) ........................................–0.5 to 100V
Freq. Control Voltage (V
RSW
, V
REL
)....... –0.5 to (V
DD
+ 0.3V)
Power Dissipation @ T
A
= 85°C ..............................200mW
Storage Temperature (T
s
) .........................–65°C to +150°C
EDS Rating
(3)
Operating Ratings
(2)
Supply Voltage (V
DD
).................................... +1.8V to +5.5V
Lamp Drive Frequency (f
EL
) ....................... 60Hz to 1000Hz
Switching Transistor Frequency (f
SW
) ........8KHz to 200KHz
Ambient Temperature (T
A
) ..........................–40°C to +85°C
Junction Thermal Resistance
PDIP (
JA
) ........................................................206°C/W
Electrical Characteristics
(4)
V
IN
= V
DD
= 3.0V; R
SW
= 560K; R
EL
= 1.0M; T
A
= 25°C, bold values indicate –40°C< T
A
< +85°C, unless noted.
Symbol Parameter Condition Min Typ Max Units
R
DS(ON)
On-resistance of switching
transistor
I
SW
= 100mA, V
CS
= 85V 3.8
7.0
85 90 95 V V
CS
Output voltage regulation V
DD
= 1.8V to 5.5V
83
97
V
170 180 190 V V
A
– V
B
Output peak-to-peak voltage V
DD
= 1.8V to 5.5V
166 194
V
V
EN-L
Input low voltage (turn-off) V
DD
= 1.8V to 5.5V 0.5 V
V
EN-H
Input high voltage (turn-on) V
DD
= 1.8V to 5.5V
V
DD
–
0.5
V
I
SD
Shutdown current, Note 5 R
SW
= LOW; R
EL
= LOW;
V
DD
= 5.5V
0.01
0.1
0.5
µA
µA
I
VDD
Input supply current
R
SW
= HIGH; R
EL
= HIGH;
V
CS
= 85V; V
A
, V
B
OPEN
21
75
µA
I
CS
Boosted supply current
R
SW
= HIGH; R
EL
= HIGH;
V
CS
= 85V; V
A
, V
B
OPEN
200
400
µA
I
IN
Input current including inductor
current
V
IN
= V
DD
= 1.8V
(See Test Circuit)
28 mA
f
EL
V
A
– V
B
output drive frequency 285 360 435 Hz
f
SW
Switching transistor frequency 53 66 79 kHz
D Switching transistor duty cycle 90 %
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
5. Shutdown current is defined as the sum of current going into pin 1, 5, and 6 when the device is disabled.
P1-P3P4-P6P7-P9P10-P12P13-P15

MIC4827YMM-TR

Mfr. #:
Buy MIC4827YMM-TR
Manufacturer:
Microchip Technology / Micrel
Description:
LED Lighting Drivers 180V EL Driver
Lifecycle:
New from this manufacturer.
Delivery:
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