MIC4826YMM TR Micrel Inc, MIC4826YMM TR Datasheet - Page 8

• Manufacturer Part Number: MIC4826YMM TR
• Description: IC DRIVER EL DC-AC 160VPP 8MSOP
• Manufacturer: Micrel Inc
• Type: EL Lamp Driverr

Specifications of MIC4826YMM TR

• Frequency: 60 ~ 1000 Hz
• Current - Supply: 21µA
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Driver Type: EL Lamp
• Operating Supply Voltage (typ): 1.8/2.5/3.3/5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: MSOP
• Pin Count: 8
• Mounting: Surface Mount
• Operating Supply Voltage (min): 1.8V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-1226-2

tors will function and the EL driver is enabled.
Application Information
Inductor
In general, smaller value inductors, which can handle more
current, are more suitable to drive larger size lamps. As the
inductor value decreases, the switching frequency (controlled
by R
voltage should be increased. Typically, inductor values ranging
from 220µH to 560µH can be used. Murata offers the LQH3C
series up to 560µH and LQH4C series up to 470µH, with low
DC resistance. A 220µH Murata (LQH4C221K04) inductor is
recommended for driving a lamp size of 3 square inches. It
Pre-designed Application Circuits
MIC4826
SW
) should be increased to avoid saturation or the input
GRM42-6X5R106K6.3
Li-Ion Battery
3.0V to 4.2V
V
IN
10µF/6.3V
Murata
GRM39X7R 224K10
C2
0.22µF/10V
Figure 5. Typical 100Hz EL Driver for 3in
3.3V
V
Murata
IN
C1
20mA
3.32M
I
IN
R2
322k
R1
160V
V
1
2
3
4
A
TIME (2ms/div)
8
–V
VDD
RSW
REL
GND
LQH4C221K04
PP
has a maximum DC resistance of 4.0Ω.
Diode
The diode must have a high reverse voltage (100V) since
the output voltage at the CS pin can reach up to 100V. A
fast switching diode with lower forward voltage and higher
reverse voltage (100V), such as BAV19WS, can be used to
enhance efficiency.
Output Capacitor
Low ESR capacitors should be used at the regulated boost
output (CS pin) of the MIC4826 to minimize the switching output
ripple voltage. Selection of the capacitor value will depend
upon the peak inductor current, inductor size, and the load.
MuRata offers the GRM40 series with up to 0.015µF at 100V,
with a X7R temperature coefficient in 0805 surface-mount
package. Typically, values ranging from 0.01µF to 0.1µF at
100V can be used for the regulated boost output capacitor.
B
MIC4826
Murata
220µH
L1
SW
CS
VB
100Hz
VA
F
EL
Vishay Telefunken
5
6
7
8
3in
BAV19WS
2
LAMP
2
D1
Lamp
Lamp Size
3in
V
L = 220µH
C
Lamp = 2in
R
R
2
IN
OUT
SW
EL
= 3.0V
= 3.32M
= 332k
= 0.01µF
C
0.01µF/100V
GRM40X7R103K
2
OUT
March 2009