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MIC2172_05 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part No. MIC2172_05
Description  100kHz 1.25A Switching Regulators
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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 5 page
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April 2005
5
M9999-042205
MIC2172/3172
Micrel, Inc.
Parameter
Conditions
Min
Typ
Max
Units
Error Amplifier Section
Transconductance (∆ICOMP/∆VFB) ∆ICOMP = ±25µA
3.0
3.9
6.0
µA/mV
2.4
7.0
µA/mV
Voltage Gain (∆VCOMP/∆VFB)
0.9V ≤ VCOMP ≤ 1.4V
500
800
2000
V/V
Output Current
V
COMP = 1.5V
125
175
350
µA
100
400
µA
Output Swing
High Clamp, V
FB = 1V
1.8
2.1
2.3
V
Low Clamp, V
FB = 1.5V
0.25
0.35
0.52
V
Compensation Pin
Duty Cycle = 0
0.8
0.9
1.08
V
Threshold
0.6
1.25
V
Output Switch Section
ON Resistance
I
SW = 1A, VFB = 0.8V
0.76
1
1.1
Current Limit
Duty Cycle = 50%, T
J ≥ 25°C
1.25
3
A
Duty Cycle = 50%, T
J < 25°C
1.25
3.5
A
Duty Cycle = 80% Note 2
1
2.5
A
Breakdown Voltage (BV)
3V ≤ VIN ≤ 40V
65
75
V
I
SW = 5mA
Oscillator Section
Frequency (f
O)
88
100
112
kHz
85
115
kHz
Duty Cycle [δ(max)]
80
89
95
%
Input Supply Voltage Section and Enable Section
Minimum Operating Voltage
2.7
3.0
V
Quiescent Current (I
Q)
3V ≤ VIN ≤ 40V, VCOMP = 0.6V, ISW = 0
7
9
mA
Shutdown, V
EN = 0V
0.1
5
µA
Quiescent Current Increase (∆IIN) ∆ISW = 1A, VCOMP = 1.5V
9
20
mA
Enable Input Threshold
0.4
1.2
2.4
V
Enable Input Current
V
EN = 0V
–1
0
1
µA
V
EN = 2.4V
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 ICL = 0.833 (2-δ) for the MIC3172.
Note 3
Specification for packaged product only.




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