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MC33275 데이터시트 PDF




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부품번호 MC33275 기능
기능 LOW DROPOUT MICROPOWER VOLTAGE REGULATOR
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MC33275 데이터시트, 핀배열, 회로
MC33275
Low Dropout 300 mA
Voltage Regulator
The MC33275 series are micropower low dropout voltage
regulators available in a wide variety of output voltages as well as
packages, DPAK, SOT–223, and SOP–8 surface mount packages.
These devices feature a very low quiescent current and are capable of
supplying output currents up to 300 mA. Internal current and thermal
limiting protection are provided by the presence of a short circuit at the
output and an internal thermal shutdown circuit.
The MC33275 is available as a MC33375 which includes an On/Off
control.
Due to the low input–to–output voltage differential and bias current
specifications, these devices are ideally suited for battery powered
computer, consumer, and industrial equipment where an extension of
useful battery life is desirable.
Features:
Low Quiescent Current (125 mA)
Low Input–to–Output Voltage Differential of 25 mV at IO = 10 mA,
and 260 mV at IO = 300 mA
Extremely Tight Line and Load Regulation
Stable with Output Capacitance of only 0.33 mF for 2.5 V Output
Voltage
Internal Current and Thermal Limiting
Simplified Block Diagram
Vin
Vout
Thermal &
Anti–sat
Protection
Rint
1.23 V
V. Ref.
54 K
Gnd
This device contains 41 active transistors
http://onsemi.com
LOW DROPOUT
MICROPOWER VOLTAGE
REGULATOR
1
3
Gnd
4
4
MC33275
12
3
Vin Gnd Vout
PLASTIC
DT SUFFIX
CASE 369A
Gnd
4
4
1
3
MC33375
123
Vin Gnd Vout
PLASTIC
ST SUFFIX
CASE 318E
8
1
1
Input
2
Gnd
3
Gnd
4
Gnd
8
Output
7
Gnd
MC33375 6
Gnd
5
N/C
Pins 4 and 5 Not Connected
PLASTIC
D SUFFIX
CASE 751
ORDERING INFORMATION
See detailed ordering and shipping information in the
package dimensions section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2000
March, 2000 – Rev. 4
1
Publication Order Number:
MC33275/D




MC33275 pdf, 반도체, 판매, 대치품
MC33275
Figure 1. Line Transient Response
7
TA = 25° C
6 CL = 0.47 mF
IL = 10 mA
5 Vout = 3.3 V
4
3
2
1
Vin
Vout
200
150
100
50
0
–50
0 –100
0 20 40 60 80 100 120 140 160 180 200
TIME (mS)
Figure 2. Line Transient Response
7
TA = 25° C
6 CL = 33 mF
IL = 10 mA
5 Vout = 3.3 V
4
3
2
1
0
0 50
Vin
Vout
100
TIME (mS)
150
70
60
50
40
30
20
10
0
–10
–20
200
Figure 3. Load Transient Response
300 1.0
200 0.8
100
LOAD CURRENT
0.6
0 0.4
–100 0.2
0
–200
–300
–400
CL = 1.0 mF
Vout = 3.3 V
–500 TA = 25° C
–600 Vin = 4.3 V
Vout CHANGE
–0.2
–0.4
–0.6
–0.8
–700
0
–1.0
50 100 150 200 250 300 350 400
TIME (mS)
350
250
150
50
–50
–150
–250
–350
–450
–550
–650
–750
0
Figure 4. Load Transient Response
LOAD CURRENT
0.14
0.09
0.04
Vout CHANGE
CL = 33.0 mF
Vout = 3.3 V
TA = 25° C
Vin = 4.3 V
–0.01
–0.06
–0.11
–0.16
50 100 150 200 250 300
TIME (mS)
Figure 5. Output Voltage versus Input Voltage
3.5
3.0
IL = 1 mA
2.5
IL = 250 mA
2.0
1.5
1.0
0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 6. Dropout Voltage versus Output Current
300
250
200
150
100
50
0
1 10 100 1000
IO, OUTPUT CURRENT (mA)
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MC33275 전자부품, 판매, 대치품
Vin
Cin
MC33275
APPLICATIONS INFORMATION
Figure 14. Typical Application Circuit
Vout
MC33275–XX
Cout
LOAD
GND
The MC33275 regulators are designed with internal
current limiting and thermal shutdown making them
user–friendly. Figure 14 is a typical application circuit. The
output capability of the regulator is in excess of 300 mA,
with a typical dropout voltage of less than 260 mV. Internal
protective features include current and thermal limiting.
EXTERNAL CAPACITORS
These regulators require only a 0.33 mF (or greater)
capacitance between the output and ground for stability for
2.5 V, 3.0 V, and 3.3 V output voltage options. Output
voltage options of 5.0 V require only 0.22 mF for stability.
The output capacitor must be mounted as close as possible
to the MC33275. If the output capacitor must be mounted
further than two centimeters away from the MC33275, then
a larger value of output capacitor may be required for
stability. A value of 0.68 mF or larger is recommended. Most
type of aluminum, tantalum, or multilayer ceramic will
perform adequately. Solid tantalums or appropriate
multilayer ceramic capacitors are recommended for
operation below 25°C. An input bypass capacitor is
recommended to improve transient response or if the
regulator is connected to the supply input filter with long
wire lengths, more than 4 inches. This will reduce the
circuit’s sensitivity to the input line impedance at high
frequencies. A 0.33 mF or larger tantalum, mylar, ceramic,
or other capacitor having low internal impedance at high
frequencies should be chosen. The bypass capacitor should
be mounted with shortest possible lead or track length
directly across the regulator’s input terminals. Figure 15
shows the ESR that allows the LDO to remain stable for
various load currents.
Figure 15. ESR for Vout = 3.0V
100
Vout = 3.0 V
Cout = 1.0 mF
Cin = 1.0 mF
10
Stable Region
1.0
0.1
0 50 100 150 200 250 300
LOAD CURRENT (mA)
Applications should be tested over all operating
conditions to insure stability.
THERMAL PROTECTION
Internal thermal limiting circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated, typically at
150°C, the output is disabled. There is no hysteresis built
into the thermal protection. As a result the output will appear
to be oscillating during thermal limit. The output will turn
off until the temperature drops below the 150°C then the
output turns on again. The process will repeat if the junction
increases above the threshold. This will continue until the
existing conditions allow the junction to operate below the
temperature threshold.
Thermal limit is not a substitute for proper
heatsinking.
The internal current limit will typically limit current to
450 mA. If during current limit the junction exceeds 150°C,
the thermal protection will protect the device also. Current
limit is not a substitute for proper heatsinking.
OUTPUT NOISE
In many applications it is desirable to reduce the noise
present at the output. Reducing the regulator bandwidth by
increasing the size of the output capacitor will reduce the
noise on the MC33275.
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