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Micrel, Inc.
Absolute Maximum Ratings (1)
Supply Voltage (V IN ) .......................................................12V
Switch Voltage (V SW )....................................... –0.3V to 34V
Enable Pin Voltage (V EN )................................... –0.3V to V IN
FB Voltage (V FB )...............................................................6V
Switch Current (I SW ) .........................................................2A
Storage Temperature (T s ) ......................... –65°C to +150°C
ESD Rating (3) .................................................................. 2kV
MIC2291
Operating Ratings (2)
Supply Voltage (V IN ).......................................... 2.5V to 10V
Junction Temperature (T J ) ........................ –40°C to +125°C
Package Thermal Resistance
2x2 MLF-8 ( θ JA ) .................................................93°C/W
Thin SOT23-5 ( θ JA )..........................................256°C/W
Electrical Characteristics (4)
T A = 25°C, V IN = V EN = 3.6V; V OUT = 10V; I OUT = 40mA, bold values indicate –40°C< T J < +125°C, unless noted.
Symbol
V IN
Parameter
Supply Voltage Range
Condition
Min
2.5
Typ
Max
10
Units
V
V UVLO
I VIN
I SD
Under Voltage Lockout
Quiescent Current
Shutdown Current
V FB > 200mV, (not switching)
V EN = 0V(5)
1.8
2.1
2.8
0.1
2.4
5
1
V
mA
μA
V FB
I FB
Feedback Voltage
Feedback Input Current
Line Regulation(7)
(±5%)
V FB = 95mV
3V ≤ V IN ≤ 5V
90
95
–450
0.5
100
1
mV
nA
%
Load Regulation(7)
5mA ≤ I OUT ≤ 40mA
0.5
%
D MAX
I SW
V SW
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
I SW = 1.0A
85
90
1.2
550
%
A
mV
I SW
V EN
I EN
Switch Leakage Current
Enable Threshold
Enable Pin Current
V EN = 0V, V SW = 10V
TURN ON
TURN OFF
V EN = 10V(6)
1.5
0.01
20
5
0.4
40
μA
V
V
μA
f SW
Oscillator Frequency
1.05
1.2
1.35
MHz
V OVP
T J
Overvoltage Protection
Overtemperature
Threshold Shutdown
MIC2291BML- 15 only
MIC2291BML- 34 only
Hysteresis
13
30
14
32
150
10
16
34
V
V
°C
°C
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical speci ? cations 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, TA. The maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model.
4. Specification for packaged product only.
5. I SD = I VIN .
6. See “Typical Characteristics” section for other V EN .
7. Guaranteed by design.
May 2007
3
M9999-051507
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