MIC2172_05 Datasheet, PDF (5/17 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators

MIC2172/3172
Parameter
Conditions
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
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 2
3V ≤ V_IN ≤ 40V
I_SW = 5mA
Duty Cycle [δ(max)]
Micrel, Inc.
Min Typ Max Units
3.0
3.9
6.0 µA/mV
2.4
7.0 µA/mV
500 800 2000 V/V
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
0.76
1
Ω
1.1
Ω
1.25
3
A
1.25
3.5
A
1
2.5
A
65
75
V
88
100 112 kHz
85
115 kHz
80
89
95
%
Input Supply Voltage Section and Enable Section
Minimum Operating Voltage
Quiescent Current (I_Q)
Quiescent Current Increase (∆I_IN)
3V ≤ V_IN ≤ 40V, V_COMP = 0.6V, I_SW = 0
Shutdown, V_EN = 0V
∆I_SW = 1A, V_COMP = 1.5V
2.7
3.0
V
7
9
mA
0.1
5
µA
9
20
mA
Enable Input Threshold
0.4
1.2
2.4
V
Enable Input Current
V_EN = 0V
V_EN = 2.4V
–1
0
1
µA
2
10
µA
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.
April 2005
5
M9999-042205