April 2010 3 M9999-042910
Micrel, Inc MIC3287
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ........................................................ 7V
Switch Voltage (VSW) ......................................–0.3V to 40V
Enable Pin Voltage (VEN) ................................... –0.3 to VIN
FB Voltage (VFB) ............................................................. 6V
Switch Current (ISW) ..................................................... 1.2A
Ambient Storage Temperature (TS) .......... –65°C to +150°C
ESD Rating(3) ................................................................ 2kV
Operating Ratings(2)
Supply Voltage (VIN) .........................................2.8V to 6.5V
Output Voltage (VOUT) .........................................VIN to 36V
Output Voltage (VOUT)(4) ...................................VIN to VOVP
Junction Temperature Range (TJ) ............ –40°C to +125°C
Package Thermal Impedance
Thin SOT-23-5 (θJA)(5) ....................................... 207°C/W
Thin SOT-23-6 (θJA)(5) ....................................... 134°C/W
8-Pin MLF (θJA) ................................................... 90°C/W
Electrical Characteristics(6)
TA = 25°C, VIN = VEN = 3.6V, VOUT = 10V, IOUT = 10mA, unless otherwise noted. Bold values indicate –40°C ≤ TJ ≤125°C.
Symbol Parameter Condition Min Typ Max Units
VIN Supply Voltage Range 2.8 6.5 V
VUVLO Under Voltage Lockout 1.8 2.1 2.4 V
IVIN Quiescent Current VFB > 500mV, (not switching) 2.1 5 mA
ISD Shutdown Current VEN = 0V(7) 0.04 1 µA
VFB Feedback Voltage (±7.5%) 231 250 269 mV
IFB Feedback Input Current VFB = 250mV –450 nA
Line Regulation 3V ≤ VIN ≤ 5V(8) 0.4 1 %
Load Regulation 5mA ≤ IOUT ≤ 20mA(8) 0.5 %
DMAX Maximum Duty Cycle 85 90 %
ISW Switch Current Limit VIN = 3.6V 350 mA
VSW Switch Saturation Voltage VIN = 3.6V, ISW = 300mA 250 mV
ISW Switch Leakage Current VEN = 0V, VSW = 10V 0.01 1 µA
VEN Enable Threshold TURN ON 1.5 V
TURN OFF 0.4 V
IEN Enable Pin Current VEN = 10V 21 40 µA
fSW Oscillator Frequency 1 1.2 1.4 MHz
VOVP Overvoltage Protection MIC3287-24YD6 17 19 24 V
MIC3287-24YML
TJ Overtemperature 150 °C
Threshold Shutdown Hysteresis 10 °C
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specications 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, TJ(max),
the junction-to-ambient thermal resistance, θJA, 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. This device is not guaranteed to operate beyond its specied 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. Specication for packaged product only.
7. I
SD = IVIN.
8. Guaranteed by design.