MIC2172_06 Datasheet, PDF (6/20 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators

Micrel
Typical Characteristics MIC3172 (cont)
Parameter
Oscillator Section
Frequency (fO)
Condition
Duty Cycle [δ(max)]
MIC2172/3172
Min Typ Max Units
88
100
112
kHz
85
115
kHz
80
89
95
%
Sync Coupling Capacitor
Required for Frequency
Lock
VPP = 3.0V
VPP = 40V
22
51
120
pF
2.2
4.7
10
pF
Input Supply Voltage Section and Enable Section
Minimum Operating
Voltage
2.7
3.0
V
Quiescent Current (IQ)
3V ≤ VIN ≤ 40V, VCOMP = 0.6V, ISW = 0
7
9
mA
Supply Current Increase
(∆IIN)
Enable Input Threshold
∆ISW = 1A, VCOMP = 1.5V
9
20
mA
0.4
1.2
2.4
V
Enable Input Current
VEN = 0V
VEN = 2.4V
–1
0
1
µA
2
10
µA
Bold type denotes specifications applicable to the full operating temperature range.
Note 1. Devices are ESD sensitive. Handling precautions required.
Note 2. For duty cycles (δ) between 50% and 95%, minimum guaranteed switch current is given by I_CL = 0.833 (2- δ) for the MIC3172.
Note 3. Specification for packaged product only.
April 2006
6
M9999-041806
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