MIC2172_05 Datasheet, PDF (4/17 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators

MIC2172/3172
Parameter
Oscillator Section
Frequency (f_O)
Duty Cycle [δ(max)]
Conditions
Micrel, Inc.
Min Typ Max Units
88
100 112 kHz
85
115 kHz
80
89
95
%
Sync Coupling Capacitor
Required for Frequency Lock
Peak-to-Peak Voltage
Required for Frequency Lock
V_PP = 3.0V
V_PP = 40V
C_COUPLING = 12pF
22
51
120
pF
2.2
4.7
10
pF
2.2
12
30
V
Input Supply Voltage Section
Minimum Operating Voltage
2.7
3.0
V
Quiescent Current (I_Q)
Supply Current Increase (∆I_IN)
3V ≤ V_IN ≤ 40V, V_COMP = 0.6V, I_SW = 0
∆I_SW = 1A, V_COMP = 1.5V
7
9
mA
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 I_CL = 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
θ_JA 8-pin PDIP ................................................. 130°C/W
θ_JA 8-pin SOIC ................................................. 120°C/W
θ_JA 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
Reference Section
Pin 2 tied to pin 3
Feedback Voltage (V_FB)
1.224
1.214
Feedback Voltage
Line Regulation
3V ≤ V_IN ≤ 40V
Feedback Bias Current (I_FB)
Typ
1.240
0.07
310
Max
1.264
1.274
750
1100
Units
V
V
%/V
nA
nA
M9999-042205
4
April 2005