mic3172 Micrel Semiconductor, mic3172 Datasheet - Page 5

• Manufacturer Part Number: mic3172
• Description: 100khz 1.25a Switching Regulators
• Manufacturer: Micrel Semiconductor

MIC2172/3172
Parameter
Error Amplifier Section
Transconductance (∆I
Voltage Gain (∆V
Output Current
Output Swing
Compensation Pin
Threshold
Output Switch Section
ON Resistance
Current Limit
Breakdown Voltage (BV)
Oscillator Section
Frequency (f
Duty Cycle [δ(max)]
Input Supply Voltage Section and Enable Section
Minimum Operating Voltage
Quiescent Current (I
Quiescent Current Increase (∆I
Enable Input Threshold
Enable Input Current
Bold type denotes specifications applicable to the full operating temperature range.
Note 1
Note 2
Note 3
April 2005
Devices are ESD sensitive. Handling precautions required.
For duty cycles (δ) between 50% and 95%, minimum guaranteed switch current is given by I
Specification for packaged product only.
O
)
COMP
Q
)
COMP
/∆V
FB
/∆V
)
FB
IN
)
) ∆I
Conditions
0.9V ≤ V
V
High Clamp, V
Low Clamp, V
Duty Cycle = 0
I
Duty Cycle = 50%, T
Duty Cycle = 50%, T
Duty Cycle = 80% Note 2
3V ≤ V
I
3V ≤ V
Shutdown, V
∆I
V
V
SW
SW
COMP
EN
EN
COMP
SW
= 1A, V
= 5mA
= 0V
= 2.4V
= 1A, V
IN
IN
= 1.5V
= ±25µA
COMP
≤ 40V
≤ 40V, V
FB
EN
COMP
FB
FB
= 0.8V
≤ 1.4V
= 0V
= 1.5V
= 1V
COMP
= 1.5V
J
J
≥ 25°C
< 25°C
= 0.6V, I
5
SW
= 0
CL
= 0.833 (2-δ) for the MIC3172.
0.25
1.25
1.25
Min
500
125
100
3.0
2.4
1.8
0.8
0.6
0.4
65
88
85
80
–1
1
0.35
0.76
Typ
800
175
100
0.9
3.9
2.1
2.7
0.1
1.2
75
89
7
9
0
2
2000
Max
0.52
1.08
1.25
350
400
112
115
6.0
7.0
2.3
1.1
3.5
2.5
3.0
2.4
95
20
10
M9999-042205
1
3
9
5
1
Micrel, Inc.
µA/mV
µA/mV
Units
V/V
kHz
kHz
mA
mA
µA
µA
µA
µA
µA
Ω
Ω
%
V
V
V
V
A
A
A
V
V
V