MIC2267 Datasheet, PDF (4/19 Pages) Micrel Semiconductor – Input Current Limiting Synchronous Buck Regulator

Micrel Inc.
MIC2267
Electrical Characteristics ⁽⁴⁾
V_IN = V_EN = 5.0V, V_OUT = 3.3V, I_LOAD = 10mA, C_IN = 10µF, L = 4.7µH, C_OUT = 47µF, R_FREQ = 100kΩ; R_SLOPEC = 100kΩ, R_LIM = 100kΩ,
R_COMP = 11.5kΩ, C_COMP = 15nF, T_A = 25°C; bold values indicate –40°C ≤ T_J ≤ 125°C; unless noted.
Parameter
Conditions
Min.
Typ.
Max. Units
Soft Start
Soft Start
Internal FETs
Adaptive
Top MOSFET RDS(ON)
Bottom MOSFET RDS(ON)
Oscillator/PWM
I_SW = 500mA, V_FB = 0.9V
I_SW = 500mA, V_FB = 1.1V
136
225
mΩ
100
225
mΩ
Oscillator Frequency
Maximum Duty Cycle
Thermal Protection
R_FREQ = 250kΩ
R_FREQ = 100kΩ
R_FREQ = 60kΩ
V_FB < 0.5V
0.32
0.4
0.48
0.8
1
1.2
MHz
1.2
1.5
1.8
100
%
Over Temperature Shutdown
Over Temperature Shutdown
Hysteresis
Power Good
160
°C
20
°C
Power Good Threshold
Power Good Output Low
Voltage
V_OUT Rising (V_OUT % below nominal)
V_FB = 0.9V, I_PGOOD = 5mA
6.5
10
12.5
%
130
200
mV
Power Good Leakage Current
V_FB = 1.0V, V_PGOOD = 5.5V
1
µA
2
Note:
4. Specification for packaged product only.
January 2011
4
M9999-011711-A