Micrel
MIC2172/3172
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
Note 1, 3. Unless otherwise specified, V
IN
= 5V.
Parameter
Reference Section
Feedback Voltage (V
FB
)
Feedback Voltage Line
Regulation
Feedback Bias Current
(I
FB
)
Error Amplifier Section
Transconductance
(∆I
COMP
/∆V
FB
)
Voltage Gain
(∆V
COMP
/∆V
FB
)
Output Current
Output Swing
Compensation Pin
Threshold
ON Resistance
Current Limit
∆I
COMP
= ±25µA
0.9V
≤
V
COMP
≤
1.4V
V
COMP
= 1.5V
High Clamp, V
FB
= 1V
Low Clamp, V
FB
= 1.5V
Duty Cycle = 0
Output Switch Section
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
1
1.1
3
3.5
2.5
Ω
Ω
A
A
A
V
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
3V
≤
V
IN
≤
40V
310
Condition
Pin 2 tied to pin 3
1.220
1.214
1.240
1.264
1.274
0.03
750
1100
V
V
%/V
nA
nA
Min
Typ
Max
Units
Breakdown Voltage (BV)
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
April 2006
4
M9999-041806
(408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
