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MIC2172_05 Datasheet(PDF) 4 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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MIC2172/3172
Micrel, Inc.
M9999-042205
4
April 2005
Parameter
Conditions
Min
Typ
Max
Units
Oscillator Section
Frequency (f
O)
88
100
112
kHz
85
115
kHz
Duty Cycle [δ(max)]
80
89
95
%
Sync Coupling Capacitor
V
PP = 3.0V
22
51
120
pF
Required for Frequency Lock
V
PP = 40V
2.2
4.7
10
pF
Peak-to-Peak Voltage
C
COUPLING = 12pF
2.2
12
30
V
Required for Frequency Lock
Input Supply Voltage Section
Minimum Operating Voltage
2.7
3.0
V
Quiescent Current (I
Q)
3V ≤ VIN ≤ 40V, VCOMP = 0.6V, ISW = 0
7
9
mA
Supply Current Increase (∆IIN)
∆ISW = 1A, VCOMP = 1.5V
9
20
mA
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.
Absolute Maximum Ratings MIC3172
Input Voltage ................................................................. 40V
Switch Voltage .............................................................. 65V
Enable Voltage .............................................................. 40V
Feedback Voltage (Transient, 1ms) ........................... ±15V
Operating Temperature Range
8-pin PDIP ................................................. –40 to +85°C
8-pin SOIC ................................................ –40 to +85°C
8-pin CerDIP ........................................... –55 to +125°C
Junction Temperature ................................ –55°C to 150°C
Thermal Resistance
θJA 8-pin PDIP .................................................130°C/W
θJA 8-pin SOIC .................................................120°C/W
θJA 8-pin CerDIP ..............................................100°C/W
Storage Temperature ................................. –65°C to 150°C
Soldering (10 sec.) .................................................... 300°C
Electrical Characteristics MIC3172 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)
1.224
1.240
1.264
V
1.214
1.274
V
Feedback Voltage
3V ≤ VIN ≤ 40V
0.07
%/V
Line Regulation
Feedback Bias Current (I
FB)
310
750
nA
1100
nA




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