MIC2171 Datasheet, PDF (3/10 Pages) Micrel Semiconductor – 100kHz 2.5A Switching Regulator Preliminary Information

MIC2171
Absolute Maximum Ratings
Input Voltage (V_IN) ........................................................ 40V
Switch Voltage (V_SW) .................................................... 65V
Feedback Voltage (transient, 1ms) (V_FB) ................... ±15V
Operating Temperature Range ...................... –40 to +85°C
Electrical Characteristics
Micrel
Junction Temperature ................................ –55°C to 150°C
Thermal Resistance
θ_JA 5-lead TO-220, Note 1 ................................. 45°C/W
θ_JA 5-lead TO-263, Note 2 ................................. 45°C/W
Storage Temperature ............................... –65°C to +150°C
Soldering (10 sec.) .................................................. +300°C
V_IN = 5V; T_A = 25°C, bold values indicate –40°C ≤ T_A ≤ +85°C; unless noted.
Parameter
Conditions
Reference Section
Feedback Voltage (V_FB)
V_COMP = 1.24V
Feedback Voltage
Line Regulation
Feedback Bias Current (I_FB)
3V ≤ V_IN ≤ 40V
V_COMP = 1.24V
V_FB = 1.24V
Error Amplifier Section
Transconductance (g_m)
∆I_COMP = ±25µA
Voltage Gain (A_V)
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 = 2A, V_FB = 0.8V
Current Limit
Breakdown Voltage (BV)
Oscillator Section
Frequency (f_O)
Duty Cycle = 50%, T_J ≥ 25°C
Duty Cycle = 50%, T_J < 25°C
Duty Cycle = 80%, Note 3
3V ≤ V_IN ≤ 40V
I_SW = 5mA
Duty Cycle [δ(max)]
Min Typ Max Units
1.220 1.240 1.264 V
1.214
1.274 V
.06
%/V
310 750 nA
1100 nA
3.0
3.9
6.0 µA/mV
2.4
7.0 µA/mV
400 800 2000 V/V
4
125 175 350
µA
100
400
µA
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
0.37 0.50
Ω
0.55
Ω
2.5
3.6
5
A
2.5
4.0
5.5
A
2.0
3.0
5
A
65
75
V
88
100 112 kHz
85
115 kHz
80
90
95
%
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 = 2A, V_COMP = 1.5V, during swich on-time
7
9
mA
9
20
mA
General Note Devices are ESD sensitive. Handling precautions required.
Note 1 Mounted vertically, no external heat sink, 1/4 inch leads soldered to PC board containing approximently 4 inch squared copper area
surrounding leads.
Note 2 All ground leads soldered to approximently 2 inches squared of horizontal PC board copper area.
Note 3 For duty cycles (δ) between 50% and 95%, minimum guaranteed switch current is I_CL = 1.66 (2-δ) Amp (Pk).
1997
4-5