MIC2171_07 Datasheet, PDF (3/12 Pages) Micrel Semiconductor – 100kHz 2.5A Switching Regulator

Micrel, Inc.
MIC2171
Absolute Maximum Ratings
Supply Voltage (V_IN) .......................................................40V
Switch Voltage (V_SW)......................................................65V
Feedback Voltage (transient, 1ms) (V_FB) .....................±15V
Lead Temperature (soldering, 10 sec.)...................... 300°C
Storage Temperature (T_s) .........................–65°C to +150°C
ESD Rating⁽¹⁾
Operating Ratings
Operating Temperature Range ................... –40°C to +85°C
Junction Temperature (T_J) ........................ –55°C to +150°C
Thermal Resistance
TO-220-5 (θ_JA) ⁽²⁾ ...............................................45°C/W
TO-263-5 (θ_JA) ⁽³⁾................................................45°C/W
Electrical Characteristics
V_IN = 5V; T_A = 25°C, bold values indicate –40°C< T_A < +85°C, unless noted.
Parameter
Condition
Min Typ Max Units
Reference Section
Feedback Voltage (V_FB)
V_COMP = 1.24V
1.220 1.240 1.264
V
1.214
1.274
V
Feedback Voltage
Line Regulation
Feedback Bias Current (I_FB)
3V ≤ V_IN ≤ 40V
V_COMP = 1.24V
V_FB = 1.24V
0.6
%/V
310
750
nA
1100
nA
Error Amplifier Section
Transconductance (g_m)
∆I_COMP = ±25µA
3.0
3.9
2.4
6.0 µA/mV
7.0 µA/mV
Voltage Gain (A_V)
Output Current
0.9V ≤ V_COMP ≤ 1.4V
V_COMP = 1.5V
400 800 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 = 2A, V_FB = 0.8V
0.37 0.50
Ω
0.55
Ω
Current Limit
Duty Cycle = 50%, T_J ≥ 25°C
Duty Cycle = 50%, T_J < 25°C
Duty Cycle = 80%, Note 4
2.5
3.6
5.0
A
2.5
4.0
5.5
A
2.5
3.0
5.0
A
Breakdown Voltage (BV)
Oscillator Section
3V ≤ V_IN ≤ 40V
I_SW = 5mA
65
75
V
Frequency (f_O)
88
100
112
kHz
85
115
kHz
Duty Cycle [δ(max)]
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 switch on-time
7
9
mA
9
20
mA
Notes:
1. Devices are ESD sensitive. Handling precautions recommended.
2. Mounted vertically, no external heat sink, 1/4 inch leads soldered to PC board containing approximately 4 inch squared copper area surrounding
leads.
3. All ground leads soldered to approximately 2 inches squared of horizontal PC board copper area.
4. For duty cycles (δ) between 50% and 95%, minimum guaranteed switch current is I_CL = 1.66 (2-δ) Amp (Pk).
May 2007
3
M9999-051107