MIC2172 Datasheet, PDF (3/16 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators Preliminary Information

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
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. 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
Line Regulation
3V ≤ V_IN ≤ 40V
0.03 %/V
Feedback Bias Current (I_FB)
310 750 nA
4
1100 nA
Error Amplifier Section
Transconductance (∆I_COMP/∆V_FB) ∆I_COMP = ±25µA
3.0
3.9
6.0 µA/mV
2.4
7.0 µA/mV
Voltage Gain (∆V_COMP/∆V_FB)
Output Current
0.9V ≤ V_COMP ≤ 1.4V
V_COMP = 1.5V
500 800 2000 V/V
125 175 350
µA
100
400
µA
Output Swing
Compensation Pin
Threshold
High Clamp, V_FB = 1V
Low Clamp, V_FB = 1.5V
Duty Cycle = 0
1.8
2.1
2.3
V
0.25 0.35 0.52
V
0.8
0.9 1.08
V
0.6
1.25
V
Output Switch Section
ON Resistance
I_SW = 1A, V_FB = 0.8V
0.76
1
Ω
1.1
Ω
Current Limit
Duty Cycle = 50%, T_J ≥ 25°C
Duty Cycle = 50%, T_J < 25°C
Duty Cycle = 80% Note 2
1.25
3
A
1.25
3.5
A
1
2.5
A
Breakdown Voltage (BV)
3V ≤ V_IN ≤ 40V
I_SW = 5mA
65
75
V
1997
4-15