MIC2186 Micrel, Inc.
M9999-042205 4 April 2005
Parameter Condition Min Typ Max Units
Enable/UVLO
Enable Input Threshold 0.6 0.9 1.2 V
UVLO Threshold 1.4 1.5 1.6 V
UVLO Hysteresis 140 mV
Enable Input Current V
EN/UVLO
= 5V 0.2 5 µA
Soft Start
Soft Start Current 5 µA
Current Limit
Current Limit Threshold Voltage (Voltage on CSH to trip current limit) 80 100 120 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
HIDC Input
HIDC Threshold 0.6 1.4 2.2 V
Oscillator Section
Oscillator Frequency (f
O
) 360 400 440 kHz
Maximum Duty Cycle V
FB
= 1.0V, V
HIDC
= 3V 85 %
V
FB
= 1.0V, V
HIDC
= 0V 50
Minimum On Time V
FB
= 1.5V, V
HiDC
= 3V 180 ns
FREQ/2 Frequency (f
O
)V
HiDC
= 3V, V
FREQ/2
= 3V 170 200 230 kHz
Frequency Foldback Threshold Measured on FB 0.3 V
Frequency Foldback Frequency V
HiDC
= 3V, 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
Rise/Fall Time C
L
= 3300pF 50 ns
Output Driver Impedance source; V
IN
P = 12V 1.8 4 Ω
sink; V
IN
P = 12V 1.6 3.5 Ω
source; V
IN
P =5V 2.6 Ω
sink; V
IN
P = 5V 2.4 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
temperature, 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.
