MIC4827
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
DD
) ....................................... –0.5V to 6V
Output Voltage (V
CS
) ................................... –0.5V to 100V
Frequency Control Voltage (V
RSW,
V
REL
) ... –0.5V to (V
DD
+0.3V)
Power Dissipation @ T
A
= 85°C ............................. 200mW
Storage Temperature (T
S
) ....................... –65°C to +150°C
ESD Rating ..............................................................
Note 3
Operating Ratings
(Note 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
Package Thermal Resistance
MSOP
(θ
JA
) ....................................................... 206°C/W
Electrical Characteristics
V
IN
= V
DD
= 3.0V, R
SW
= 560KΩ, R
EL
= 1.0MΩ. T
A
= 25°C unless otherwise specified.
Bold
values indicate
–40°C
≤
T
A
≤
+85°C
Symbol
R
DS(ON)
V
CS
V
A
– V
B
V
EN-L
V
EN-H
I
SD
I
VDD
I
CS
I
IN
f
EL
f
SW
D
Note 1.
Note 2.
Note 3.
Note 4.
Parameter
On-resistance of switching transistor
Output voltage regulation
Condition
I
SW
= 100 mA, V
CS
= 85V
V
DD
= 1.8V to 5.5V
V
DD
= 1.8V to 5.5V
V
DD
= 1.8V to 5.5V
V
DD
= 1.8V to 5.5V
R
SW
= LOW; R
EL
= LOW;
V
DD
= 5.5V
R
SW
= HIGH; R
EL
= HIGH;
V
CS
= 85V; V
A
, V
B
OPEN
R
SW
= HIGH; R
EL
= HIGH;
V
CS
= 85V; V
A
, V
B
OPEN
V
IN
= V
DD
= 1.8V
(See Test Circuit)
Min
Typ
3.8
Max
7.0
95
97
Units
Ω
V
V
V
V
V
V
85
83
90
Output peak-to-peak voltage
170
166
180
190
194
0.5
Input low voltage (turn-off)
Input high voltage (turn-on)
Shutdown current,
Note 4
Input supply current
Boosted supply current
Input current including inductor
current
V
A
–V
B
output drive frequency
Switching transistor frequency
Switching transistor duty cycle
V
DD
–0.5
0.01
21
200
28
285
53
360
66
90
435
79
0.1
0.5
75
400
µA
µA
µA
µA
mA
Hz
kHz
%
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
Shutdown current is defined as the sum of current going into pin 1, 5, and 6 when the device is disabled.
Test Circuit
V
IN
C
IN
10µF
1
L1
220µH
D1
1N4148
C
OUT
0.033µF/100V
5
6
8
7
MIC4827
VDD
RSW
REL
GND
SW
CS
VA
VB
562k
2
3.32M
3
4
100Ω
10nF
January 2005
3
MIC4827
MICREL [ MICREL SEMICONDUCTOR ]
