MIC2172/3172
Micrel
Absolute Maximum Ratings MIC2172
Input Voltage ................................................................. 40V
Switch Voltage .............................................................. 65V
Sync Current .............................................................. 50mA
Feedback Voltage (Transient, 1ms) ...........................
±15V
Operating Temperature Range
8-pin PDIP ................................................. –40 to +85°C
8-pin SOIC ................................................ –40 to +85°C
Junction Temperature .............................. –55°C to +150°C
Thermal Resistance
θ
JA
8-pin PDIP .................................................130°C/W
θ
JA
8-pin SOIC .................................................120°C/W
Storage Temperature ............................... –65°C to +150°C
Soldering (10 sec.) .................................................. +300°C
Electrical Characteristics MIC2172
Parameter
Reference Section
Feedback Voltage (V
FB
)
Feedback Voltage
Line Regulation
Feedback Bias Current (I
FB
)
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
3V
≤
V
IN
≤
40V
Conditions
Pin 2 tied to pin 3
Note 1. Unless otherwise specified, V
IN
= 5V.
Min
Typ
Max
Units
1.220
1.214
1.240
1.264
1.274
0.03
V
V
%/V
nA
nA
310
750
1100
4
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
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
0.9V
≤
V
COMP
≤
1.4V
V
COMP
= 1.5V
High Clamp, V
FB
= 1V
Low Clamp, V
FB
= 1.5V
Duty Cycle = 0
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
0.76
1
1.1
3
3.5
2.5
Ω
Ω
A
A
A
V
Breakdown Voltage (BV)
75
1997
4-15
MICREL [ MICREL SEMICONDUCTOR ]
