MIC2185 Micrel, Inc.
MIC2185 4 October 2005
Parameter Condition Min Typ Max Unit
Soft Start
Soft Start Current 5 µA
Current Limit
Current Limit Threshold Voltage Voltage on CSH to trip current limit 100 mV
Error Amplifier
Error Amplifier Gain 20 V/V
Current Amplifier
Current Amplifier Gain 3.7 V/V
SKIP Input
SKIP Threshold 0.6 1.4 2.2 V
SKIP Input Current V
SKIP
= 3V 0.1 5 µA
Oscillator Section
Oscillator Frequency (f
S
) 360 400 440 kHz
Maximum Duty Cycle V
FB
= 1.0V 85 %
Minimum On Time V
FB
= 1.5V 180 ns
FREQ/2 frequency (f
S
) V
FREQ/2
=3V 170 200 230
Frequency Foldback Threshold Measured at FB pin 0.3 V
Frequency Foldback Frequency V
FREQ/2
=0V 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 Note 4 f
O
+15 % 600 kHz
Gate Drivers (OUTN and OUTP)
Rise/Fall Time C
L
= 3300pF 50 ns
Driver Non-overlap Time V
IN
P = 12V 70 ns
V
IN
P = 5V 90 ns
Output Driver Impedance Source; V
IN
P = 12V 4 8 Ω
Sink; V
IN
P = 12V 3 7 Ω
Source; V
IN
P = 5V 5 11 Ω
Sink; V
IN
P = 5V 5 11 Ω
Note 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 tempera-
ture, T
J(max)
, the junction-to-ambient thermal resistance, θ
JA
, and the ambient temperature, T
A
.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4. See application information for limitations on maximum operating frequency.
