0.5A Step-Down Switching Regulator
TC2574
ABSOLUTE MAXIMUM RATINGS*
Maximum Supply Voltage ................................ V
IN
= 45V
ON/OFF Pin Input Voltage ..................... –0.3V
≤
V
≤
+V
IN
Output Voltage to Ground (Steady State) ............... –1.0 V
Max Power Dissipation (SOIC) ........... (Internally Limited)
Thermal Resistance, Junction-to-Ambient ..... 145°C/W
Max Power Dissipation (PDIP) ............ (Internally Limited)
Thermal Resistance, Junction-to-Ambient ... 100°C/W
Thermal Resistance, Junction-to-Case ........ 5.0°C/W
Storage Temperature Range ................. –65°C to +150°C
Minimum ESD Rating .............................................. 2.0kV
(Human Body Model: C = 100 pF, R = 1.5 kΩ)
Lead Temperature (Soldering, 10 seconds) .......... 260
°C
Maximum Junction Temperature............................. 150°C
Operating Junction Temperature Range .... –40 to +125*C
Supply Voltage ............................................................40V
*This is a stress rating only, and functional operation of the device at these
or any other conditions beyond those indicated in the operation section of
the specifications is not implied. Exposure to absolute maximum ratings
conditions for extended periods of time may affect device reliability.
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, V
IN
= 12V for the 3.3V, 5.0V, and Adjustable
version,V
IN
= 25V for the 12V version. I
LOAD
= 100mA. For typical values T
J
= 25°C, for min/max values T
J
is the operating
junction temperature range that applies (Note 2), unless otherwise noted.
Symbol
V
OUT
Parameter
Output Voltage
Test Conditions
V
IN
= 12V, I
LOAD
= 100mA, T
J
= 25°C
4.75V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
0.5AV
T
J
= 25°C
T
J
= –40°C to +125°
V
IN
= 12V, I
LOAD
= 0.5 A
V
IN
= 12V, I
LOAD
= 100mA, T
J
= 25°C
7.0V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
0.5A
T
J
= 25°C
T
J
= –40°C to +125°C
V
IN
= 12V, I
LOAD
= 0.5 A
V
IN
= 25V, I
LOAD
= 100mA, T
J
= 25°C
15V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
0.5A
T
J
= 25°C
T
J
= –40°C to +125°C
V
IN
= 15V, I
LOAD
= 0.5 A
V
IN
= 12V, I
LOAD
= 100mA, V
OUT
= 5.0V,
T
J
= 25*C
7.0V
≤
V
IN
≤
40V, 0.1A
≤
I
LOAD
≤
0.5A
V
OUT
= 5.0V
T
J
= 25°C
T
J
= –40°C to +125°C
V
IN
= 12V, I
LOAD
= 0.5A, V
OUT
= 5.0V
Min
3.234
3.168
3.135
—
4.9
4.8
4.75
—
11.76
11.52
11.4
—
1.217
Typ
3.3
3.3
—
72
5.0
5.0
—
77
10
12
—
88
1.23
Max
3.366
3.432
3.465
—
5.1
5.2
5.25
—
12.24
12.48
12.6
—
1.243
Units
V
TC2574-3.3 [( Note 1) Test Circuit Figure 2]
η
V
OUT
Efficiency
Output Voltage
%
V
TC2574-5 [( Note 1) Test Circuit Figure 2]
η
V
OUT
Efficiency
Output Voltage
%
V
TC2574-12 [( Note 1) Test Circuit Figure 2]
η
V
FB
V
FBT
Efficiency
Feedback Voltage
Feedback Voltage
%
V
TC2574-Adjustable Version [( Note 1) Test Circuit Figure 2]
η
Efficiency
1.193
1.18
—
1.23
—
77
1.267
1.28
—
%
NOTES:
1. External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system
performance. When the TC2574 is used as shown in the Figure 2 test circuit, the system performance will be as
shown in the system parameters section of the Electrical Characteristics.
2. Tested junction temperature range for the TC2574: T
LOW
= –40°C T
HIGH
= +125°C
TC2574-1 1/6/00
2
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