MIC3287
Micrel, Inc.
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................................ 6V
Switch Voltage (V
SW
) ......................................–0.3V to 34V
Enable Pin Voltage (V
EN
) ................................... –0.3 to V
IN
FB Voltage (V
FB
) ............................................................. 6V
Switch Current (I
SW
) ..................................................... 1.2A
Ambient Storage Temperature (T
S
) .......... –65°C to +150°C
ESD Rating
(3)
................................................................ 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
) .........................................2.8V to 5.5V
Output Voltage (V
OUT
)
(4)
...................................V
IN
to V
OUT
Junction Temperature Range (T
J
) ............ –40°C to +125°C
Package Thermal Impedance
Thin SOT-23-5 (θ
JA
)
(5)
....................................... 207°C/W
Thin SOT-23-6 (θ
JA
)
(5)
....................................... 134°C/W
8-Pin MLF (θ
JA
) ................................................... 90°C/W
Electrical Characteristics
(6)
T
A
= 25°C, V
IN
= V
EN
= 3.6V, V
OUT
= 10V, I
OUT
= 10mA, unless otherwise noted.
Bold
values indicate –40°C ≤ T
J
≤125°C.
Symbol
Parameter
Condition
Min
2.8
1.8
V
EN
=
V
FB
> 500mV, (not switching)
0V
(7)
(±7.5%)
231
2.1
2.1
0.04
250
–450
0.4
0.5
85
350
250
0.01
1.5
21
1
17
1.2
19
150
10
1
0.4
40
1.4
24
90
1
Typ
V
IN
Supply Voltage Range
Under Voltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Input Current
Line Regulation
Load Regulation
D
MAX
I
SW
I
SW
V
SW
V
EN
I
EN
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Enable Pin Current
Oscillator Frequency
Overvoltage Protection
Overtemperature
Threshold Shutdown
Max
5.5
2.4
5
1
269
Units
V
V
mA
µA
mV
nA
%
%
%
mA
mV
µA
V
V
µA
MHz
V
°C
°C
V
UVLO
I
VIN
I
SD
I
FB
V
FB
V
FB
= 250mV
5mA ≤ I
OUT
≤ 20mA
(8)
V
IN
= 3.6V
3V ≤ V
IN
≤ 5V
(8)
V
IN
= 3.6V, I
SW
= 300mA
TURN ON
TURN OFF
V
EN
= 10V
MIC3287 - 24YD6
MIC3287-24YML
Hysteresis
V
EN
= 0V, V
SW
= 10V
f
SW
V
OVP
T
J
Notes:
1.
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating
the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
(max),
the junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
. The maximum allowable power dissipation will result in excessive
die temperature, and the regulator will go into thermal shutdown.
2.
This device is not guaranteed to operate beyond its specified operating ratings.
3.
Devices are inherently ESD sensitive. Handling precautions required. Human body model.
4.
For options with OVP.
5.
Using 4 layer PCB.
6.
Specification for packaged product only.
7.
I
SD
= I
VIN
.
8.
Guaranteed by design.
January 2006
3
M9999-010306
MICREL [ MICREL SEMICONDUCTOR ]
