Micrel MIC2044, Manual

Page: 5 / 15

January 2005 5 MIC2044/2045
MIC2044/2045 Micrel
Symbol Parameter Condition Min Typ Max Units
t
FLAG
Flag Response Delay V
IN
= V
BIAS
= 3V, 5V 25 32 40 ms
t
ON
Output Turn-on Delay R
LOAD
= 10 Ω , C
LOAD
= 1 µ F 0.75 1 1.25 ms
t
R
Output Turn-on Rise Time R
LOAD
= 10
Ω
, C
LOAD
= 1
µ
F 1.5 2.5 3.5 ms
t
OFF
Output Turn-off Delay R
LOAD
= 10 Ω , C
LOAD
= 1 µ F 1 5 µ s
t
F
Output Turn-off Fall Time R
LOAD
= 10
Ω
, C
LOAD
= 1
µ
F 24
µ
s
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.5k Ω in series with 100pF.
Note 4. Specification for packaged product only.
Note 5. OFF is V
EN
< 1.0V for MIC2044/MIC2045–1 and V
EN
> 4.0V for MIC2044/MIC2045 –2. ON is V
EN
> 4.0V for MIC2044/MIC2045–1 and
V
EN
< 1.0V for MIC2044/MIC2045 –2.
Note 6. The current limit is determined as follows: I
LIM
= CLF/R
SET
.
Timing Diagrams
50%
(a) MIC2044/45-1
(b) MIC2044/45-2
10%
90%
0
V
EN
t
ON
t
OFF
0
V
OUT
50%
10%
90%
0
V
EN
t
ON
t
OFF
0
V
OUT
Figure 1. Turn-On/Turn-Off Delay
0
V
EN
I
LIMIT
0
V
OUT
0
I
OUT
0
/FAULT
t
FLAG
V
IN
0.2V
Increase the load
Figure 2. Overcurrent Fault Response — MIC2044-2