MIC2184 Datasheet, PDF (5/12 Pages) Micrel Semiconductor – Low Voltage Buck PWM Control IC Final Information

MIC2184
Micrel
Parameter
Condiion
Min Typ Max Units
Soft Start
Soft Start Current
5
µA
Current Limit
Current Limit Threshold Voltage Voltage on CSH-CSL to trip current limit
100
mV
Error Amplifier
Error Amplifier Gain
20
V/V
Current Amplifier
Current Amplifier Gain
3.0
V/V
Oscillator Section
Oscillator Frequency (f_O)
Maximum Duty Cycle
Minimum On Time
Freq/2 Frequency (f_O)
Frequency Foldback Threshold
V_FB = 1.0V
V_FB = 1.5V
V_FREQ/2 = 5V
Measured on FB
360 400 440 kHz
100
%
185
ns
170 200 230 kHz
0.3
V
Frequency Foldback Frequency
90
kHz
SYNC Threshold Level
0.6
1.4
2.2
V
SYNC Input Current
0.1
5
µA
SYNC Minimum Pulse Width
200
ns
SYNC Capture Range
FreqOut Output
Note 5
f_O +15 %
600 kHz
FreqOut Frequency
FreqOut Current Drive
Note 6
Sink
f_O / 2
kHz
8
mA
Source
–6
mA
Gate Drivers
Rise/Fall Time
Output Driver Impedance
C_L = 3300pF
Source; V_INP = 12V
Sink; V_INP = 12V
Source; V_INP = 5V
Sink; V_INP = 5V
50
ns
1.8
4
Ω
1.6
3.5
Ω
2.6
Ω
2.4
Ω
Note 1:
Note 2.
Note 3.
Note 4:
Note 5:
Note 6:
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, T_A.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
See application information for I(V_INP) vs. V_INP.
See application information for limitations on maximum operating frequency.
The frequency on FreqOut is half the frequency of the oscillator, or half the frequency of the external Sync signal.
December 10, 2001
5
MIC2184