MIC2172_05 Datasheet, PDF (3/17 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators

MIC2172/3172
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
Micrel, Inc.
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
Storage Temperature ............................... –65°C to +150°C
Soldering (10 sec.) .................................................. +300°C
Electrical Characteristics MIC2172 Note 1, 3. Unless otherwise specified, V_IN = 5V.
Parameter
Conditions
Min
Reference Section
Pin 2 tied to pin 3
Feedback Voltage (V_FB)
1.220
1.214
Feedback Voltage
Line Regulation
3V ≤ V_IN ≤ 40V
Feedback Bias Current (I_FB)
Error Amplifier Section
Transconductance (∆I_COMP/∆V_FB) ∆I_COMP = ±25µA
Voltage Gain (∆V_COMP/∆V_FB)
Output Current
0.9V ≤ V_COMP ≤ 1.4V
V_COMP = 1.5V
Output Swing
Compensation Pin
Threshold
Output Switch Section
ON Resistance
High Clamp, V_FB = 1V
Low Clamp, V_FB = 1.5V
Duty Cycle = 0
I_SW = 1A, V_FB = 0.8V
3.0
2.4
500
125
100
1.8
0.25
0.8
0.6
Current Limit
Duty Cycle = 50%, T_J ≥ 25°C
1.25
Duty Cycle = 50%, T_J < 25°C
1.25
Duty Cycle = 80% Note 2
1
Breakdown Voltage (BV)
3V ≤ V_IN ≤ 40V
65
I_SW = 5mA
Typ
1.240
310
3.9
800
175
2.1
0.35
0.9
0.76
75
Max Units
1.264 V
1.274 V
0.03 %/V
750 nA
1100 nA
6.0
7.0
2000
350
400
2.3
0.52
1.08
1.25
µA/mV
µA/mV
V/V
µA
µA
V
V
V
V
1
Ω
1.1
Ω
3
A
3.5
A
2.5
A
V
April 2005
3
M9999-042205