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MIC2285 Datasheet, PDF (3/14 Pages) Micrel Semiconductor – 8MHz PWM Synchronous Buck Regulator with LDO Standby Mode
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Micrel, Inc.
MIC2285
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ............................................ +6V
Output Switch Voltage (VSW) ............................... +6V
Output Switch Current (ISW) ................................... 2A
Logic Input Voltage (VEN,VLOWQ) .............. -0.3V to VIN
Storage Temperature (Ts)................ -60°C to +150°C
ESD Rating(3) ....................................................... 3kV
Operating Ratings(2)
Supply Voltage (VIN)............................+2.7V to +5.5V
Logic Input Voltage (VEN,VLOWQ) .............. -0.3V to VIN
Junction Temperature (TJ) .............. –40°C to +125°C
Junction Thermal Resistance
3x3 MLF-10L (θJA)................................... 60°C/W
Electrical Characteristics(4)
VIN = VEN = VLOWQ =3.6V; L = 0.47µH; COUT = 10µF; TA = 25°C, unless noted. Bold values indicate –40°C< TJ < +125°C
Parameter
Condition
Min
Typ
Max Units
Supply Voltage Range
2.7
5.5
V
Under-Voltage Lockout
Threshold
(turn-on)
2.45 2.55 2.65
V
UVLO Hysteresis
100
mV
Quiescent Current, PWM
mode
VFB = 0.9 * VNOM (not switching)
790
900
µA
Quiescent Current, LDO
mode
VLOWQ = 0V;IOUT = 0mA
20
29
µA
Shutdown Current
[Adjustable] Feedback
Voltage
VEN = 0V
± 2% (over temperature)
0.01
5
µA
0.98
1
1.02
V
FB pin input current
1
nA
Current Limit in PWM Mode VFB = 0.9 * VNOM
0.675
1
1.85
A
Output Voltage Line
VOUT > 2V; VIN = VOUT+300mV to 5.5V; ILOAD= 100mA
0.13
%
Regulation
VOUT < 2V; VIN = 2.7V to 5.5V; ILOAD= 100mA
Output Voltage Load
Regulation, PWM Mode
20mA < ILOAD < 300mA
0.2
0.8
%
Output Voltage Load
Regulation, LDO Mode
100µA < ILOAD < 50mA
VLOWQ = 0V
0.5
1
%
Maximum Duty Cycle
VFB ≤ 0.4V
100
%
PWM Switch ON-
Resistance
ISW = 50mA VFB = 0.7VFB_NOM (High Side Switch)
ISW = -50mA VFB = 1.1VFB_NOM (Low Side Switch)
0.4
Ω
0.4
Oscillator Frequency
7.2
8
8.8
MHz
LOWQ threshold voltage
0.5
0.85
1.3
V
LOWQ Input Current
Enable Threshold
Enable Input Current
LDO Dropout Voltage
IOUT = 50mA Note 5
0.1
2
µA
0.5
0.85
1.3
V
0.1
2
µA
110
mV
January 2006
3
M9999-012406
www.micrel.com
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