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MIC2172_05 Datasheet(PDF) 3 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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 3 page
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April 2005
3
M9999-042205
MIC2172/3172
Micrel, Inc.
Electrical Characteristics MIC2172 Note 1, 3. Unless otherwise specified, V
IN = 5V.
Parameter
Conditions
Min
Typ
Max
Units
Reference Section
Pin 2 tied to pin 3
Feedback Voltage (V
FB)
1.220
1.240
1.264
V
1.214
1.274
V
Feedback Voltage
3V ≤ VIN ≤ 40V
0.03
%/V
Line Regulation
Feedback Bias Current (I
FB)
310
750
nA
1100
nA
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
Absolute Maximum Ratings MIC2172
Input Voltage ................................................................. 40V
Switch Voltage .............................................................. 65V
Sync Current .............................................................. 50mA
Feedback Voltage (Transient, 1ms) ........................... ±15V
Operating Temperature Range
8-pin PDIP ................................................. –40 to +85°C
8-pin SOIC ................................................ –40 to +85°C
Junction Temperature .............................. –55°C to +150°C
Thermal Resistance
θJA 8-pin PDIP .................................................130°C/W
θJA 8-pin SOIC .................................................120°C/W
Storage Temperature ............................... –65°C to +150°C
Soldering (10 sec.) .................................................. +300°C




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