MIC2291_11 Datasheet, PDF (3/10 Pages) Micrel Semiconductor – 1.2A PWM Boost Regulator Photo Flash LED Driver

Micrel, Inc.
MIC2291
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
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 Parameter
Condition
Min Typ Max
V_IN
Supply Voltage Range
2.5
10
V_UVLO
Under Voltage Lockout
1.8
2.1
2.4
I_VIN
Quiescent Current
V_FB > 200mV, (not switching)
2.8
5
I_SD
Shutdown Current
V_EN = 0V(5)
0.1
1
V_FB
Feedback Voltage
(±5%)
90
95
100
I_FB
Feedback Input Current
V_FB = 95mV
–450
Line Regulation(7)
3V ≤ V_IN ≤ 5V
0.5
1
Load Regulation(7)
5mA ≤ I_OUT ≤ 40mA
0.5
D_MAX
Maximum Duty Cycle
85
90
I_SW
Switch Current Limit
1.2
V_SW
Switch Saturation Voltage
I_SW = 1.0A
550
I_SW
Switch Leakage Current
V_EN = 0V, V_SW = 10V
0.01
5
V_EN
Enable Threshold
TURN ON
TURN OFF
1.5
0.4
I_EN
Enable Pin Current
V_EN = 10V(6)
20
40
f_SW
Oscillator Frequency
1.05 1.2
1.35
V_OVP
Overvoltage Protection
MIC2291BML- 15 only
MIC2291BML- 34 only
13
14
16
30
32
34
T_J
Overtemperature
150
Threshold Shutdown
Hysteresis
10
Units
V
V
mA
µA
mV
nA
%
%
%
A
mV
µA
V
V
µA
MHz
V
V
°C
°C
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, 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