MIC2172/3172
Parameter
Error Amplifier Section
Transconductance (∆I
COMP
/∆V
FB
)
∆I
COMP
=
±25µA
Voltage Gain (∆V
COMP
/∆V
FB
)
Output Current
Output Swing
Compensation Pin
Threshold
Output Switch Section
ON Resistance
Current Limit
I
SW
= 1A, V
FB
= 0.8V
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
1.25
1.25
1
65
75
0.76
0.9V
≤
V
COMP
≤
1.4V
V
COMP
= 1.5V
High Clamp, V
FB
= 1V
Low Clamp, V
FB
= 1.5V
Duty Cycle = 0
3.0
2.4
500
125
100
1.8
0.25
0.8
0.6
3.9
800
175
2.1
0.35
0.9
Conditions
Min
Typ
Micrel, Inc.
Max
Units
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
1.1
3
3.5
2.5
Ω
Ω
A
A
A
V
Breakdown Voltage (BV)
Oscillator Section
Frequency (f
O
)
Duty Cycle [δ(max)]
88
85
80
100
89
112
115
95
kHz
kHz
%
Input Supply Voltage Section and Enable Section
Minimum Operating Voltage
Quiescent Current (I
Q
)
Quiescent Current Increase (∆I
IN
)
Enable Input Threshold
Enable Input Current
V
EN
= 0V
V
EN
= 2.4V
3V
≤
V
IN
≤
40V, V
COMP
= 0.6V, I
SW
= 0
Shutdown, V
EN
= 0V
∆I
SW
= 1A, V
COMP
= 1.5V
0.4
–1
2.7
7
0.1
9
1.2
0
2
3.0
9
5
20
2.4
1
10
V
mA
µA
mA
V
µA
µA
Bold
type denotes specifications applicable to the full operating temperature range.
Note 1
Note 2
Note 3
Devices are ESD sensitive. Handling precautions required.
For duty cycles (δ) between 50% and 95%, minimum guaranteed switch current is given by I
CL
= 0.833 (2-δ) for the MIC3172.
Specification for packaged product only.
April 2005
5
M9999-042205
MICREL [ MICREL SEMICONDUCTOR ]
