mic3172 Micrel Semiconductor, mic3172 Datasheet - Page 3

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

MIC2172/3172
Absolute Maximum Ratings MIC2172
Input Voltage ................................................................. 40V
Switch Voltage .............................................................. 65V
Sync Current .............................................................. 50mA
Feedback Voltage (Transient, 1ms) ........................... ±15V
Operating Temperature Range
Electrical Characteristics MIC2172
Parameter
Reference Section
Feedback Voltage (V
Feedback Voltage
Line Regulation
Feedback Bias Current (I
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)
April 2005
8-pin PDIP ................................................. –40 to +85°C
8-pin SOIC ................................................ –40 to +85°C
COMP
FB
COMP
/∆V
)
FB
FB
)
/∆V
)
FB
) ∆I
Conditions
Pin 2 tied to pin 3
3V ≤ V
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
SW
SW
COMP
COMP
= 1A, V
= 5mA
IN
IN
= 1.5V
= ±25µA
COMP
≤ 40V
≤ 40V
FB
FB
FB
= 0.8V
≤ 1.4V
= 1.5V
= 1V
Note 1, 3. Unless otherwise specified, V
J
J
≥ 25°C
< 25°C
3
Junction Temperature .............................. –55°C to +150°C
Thermal Resistance
Storage Temperature ............................... –65°C to +150°C
Soldering (10 sec.) .................................................. +300°C
θ
θ
JA
JA
8-pin PDIP ................................................. 130°C/W
8-pin SOIC ................................................. 120°C/W
IN
= 5V.
1.220
1.214
0.25
1.25
1.25
Min
500
125
100
3.0
2.4
1.8
0.8
0.6
65
1
1.240
0.35
0.76
Typ
800
175
310
0.9
3.9
2.1
75
1.264
1.274
1100
2000
Max
0.03
0.52
1.08
1.25
750
350
400
6.0
7.0
2.3
1.1
3.5
2.5
M9999-042205
1
3
Micrel, Inc.
µA/mV
µA/mV
Units
%/V
V/V
nA
nA
µA
µA
Ω
Ω
V
V
V
V
V
V
A
A
A
V