mic3172 Micrel Semiconductor, mic3172 Datasheet - Page 4

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

MIC2172/3172
Parameter
Oscillator Section
Frequency (f
Duty Cycle [δ(max)]
Sync Coupling Capacitor
Required for Frequency Lock
Peak-to-Peak Voltage
Required for Frequency Lock
Input Supply Voltage Section
Minimum Operating Voltage
Quiescent Current (I
Supply Current Increase (∆I
Bold type denotes specifications applicable to the full operating temperature range.
Note 1
Note 2
Note 3
Absolute Maximum Ratings MIC3172
Input Voltage ................................................................. 40V
Switch Voltage .............................................................. 65V
Enable Voltage .............................................................. 40V
Feedback Voltage (Transient, 1ms) ........................... ±15V
Operating Temperature Range
Electrical Characteristics MIC3172
Parameter
Reference Section
Feedback Voltage (V
Feedback Voltage
Line Regulation
Feedback Bias Current (I
M9999-042205
8-pin PDIP ................................................. –40 to +85°C
8-pin SOIC ................................................ –40 to +85°C
8-pin CerDIP ........................................... –55 to +125°C
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
)
Q
FB
)
)
FB
)
IN
)
Conditions
V
V
C
3V ≤ V
∆I
Conditions
Pin 2 tied to pin 3
3V ≤ V
PP
PP
COUPLING
SW
= 3.0V
= 40V
= 1A, V
IN
IN
≤ 40V, V
≤ 40V
= 12pF
COMP
COMP
Note 1, 3. Unless otherwise specified, V
= 1.5V
= 0.6V, I
4
SW
Junction Temperature ................................ –55°C to 150°C
Thermal Resistance
Storage Temperature ................................. –65°C to 150°C
Soldering (10 sec.) .................................................... 300°C
= 0
θ
θ
θ
JA
JA
JA
8-pin PDIP ................................................. 130°C/W
8-pin SOIC ................................................. 120°C/W
8-pin CerDIP .............................................. 100°C/W
CL
= 0.833 (2-δ) for the MIC3172.
IN
= 5V.
1.224
1.214
Min
Min
2.2
2.2
88
85
80
22
1.240
0.07
Typ
Typ
100
310
4.7
2.7
89
51
12
7
9
1.264
1.274
1100
Max
Max
112
115
120
750
3.0
95
10
30
20
9
Micrel, Inc.
April 2005
Units
Units
%/V
kHz
kHz
mA
mA
nA
nA
pF
pF
%
V
V
V
V