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MC33375
Advance Information
Low Dropout 300 mA Voltage Regulator with ON/OFF Control
The MC33375 series are micropower low dropout voltage regulators available in a wide variety of output voltages as well as packages, 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 MC33375 has a control pin that allows a logic level signal to turn-off or turn-on the regulator output. 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.
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LOW DROPOUT MICROPOWER VOLTAGE REGULATOR
Gnd
4
AYW 375xx
1 2 3
A = Manufacturing Code YW = Date xx = Version
* Low Quiescent Current (0.3 mA in OFF mode; 125 mA in ON mode) * 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 Logic Level ON/OFF Control
Input
2
Features:
Vin ON/OFF Vout
4 1 3
PLASTIC ST SUFFIX CASE 318E
1
8
Output
7 3
Simplified Block Diagram
Vin Vout
Gnd Gnd ON/OFF
4
ALYW 375xx
Gnd
6
Gnd
5
N/C
Pins 4 and 5 Not Connected Thermal & Anti-sat Protection On/Off Rint
8 1
AL = Manufacturing Code YW = Date xx = Version
On/Off Block
1.23 V V. Ref. 54 K Gnd This device contains 41 active transistors
PLASTIC D SUFFIX CASE 751
ORDERING INFORMATION
This document contains information on a new product. Specifications and information herein are subject to change without notice. See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2000
1
March, 2000 - Rev. 4
Publication Order Number: MC33375/D
MC33375
ELECTRICAL CHARACTERISTICS (CL = 1.0F, TA = 25C, for min/max values TJ = -40C to +125C, Note 1)
Characteristic Output Voltage 1.8 V Suffix 2.5 V Suffix 3.0 V Suffix 3.3 V Suffix 5.0 V Suffix 1.8 V Suffix 2.5 V Suffix 3.0 V Suffix 3.3 V Suffix 5.0 V Suffix Line Regulation Load Regulation Dropout Voltage IO = 10 mA IO = 100 mA IO = 250 mA IO = 300 mA IO = 0 mA to 250 mA TA = 25C, Vin = [VO + 1] V Symbol VO 1.782 2.475 2.970 3.267 4.950 1.764 2.450 2.940 3.234 4.900 Regline Regload Vin - VO TJ = -40C to +125C -- -- -- -- -- Vn -- -- 160 46 -- -- 65 25 115 220 260 75 100 200 400 500 -- dB - - 1.80 2.50 3.00 3.30 5.00 -- -- -- -- -- 2.0 5.0 1.818 2.525 3.030 3.333 5.05 1.836 2.550 3.060 3.366 5.100 10 25 mV mV mV Min Typ Max Unit Vdc
Vin = [VO + 1] V, 0 < IO < 100 mA 2% Tolerance from TJ = -40 to +125C
Vin = [VO + 1] V to 12 V, IO = 250 mA, All Suffixes TA = 25C Vin = [VO + 1] V, IO = 0 mA to 250 mA, All Suffixes TA = 25C
Ripple Rejection (120 Hz)
Vin(peak-peak) = [VO + 1.5] V to [VO + 5.5] V
Output Noise Voltage CL = 1 mF IO = 50 mA (10 Hz to 100 kHz) CL = 200 mF
mVrms
CURRENT PARAMETERS
Quiescent Current On Mode Vin = [VO + 1] V, IO = 0 mA Off Mode On Mode SAT Vin = [VO - 0.5] V, IO = 0 mA, Note 2 Current Limit Vin = [VO + 1] V, VO shorted IQ -- -- -- ILIMIT -- 125 0.3 1100 450 200 4.0 1500 -- mA
mA
ON/OFF INPUTS
On/Off Input Voltage Logic "1" (Regulator On) Vout = VO 2% Logic "0" (Regulator Off) Vout < 0.03V Logic "0" (Regulator Off) Vout < 0.05V (1.8 V Option) VCTRL 2.4 -- -- -- -- -- -- 0.5 0.3 V
THERMAL SHUTDOWN
Thermal Shutdown -- -- 150 -- C
NOTE: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. NOTE: 2. Quiescent Current is measured where the PNP pass transistor is in saturation. Vin = [VO - 0.5] V guarantees this condition.
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MC33375
DEFINITIONS Load Regulation - The change in output voltage for a change in load current at constant chip temperature. Dropout Voltage - The input/output differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100 mV below its nominal value (which is measured at 1.0 V differential), dropout voltage is affected by junction temperature, load current and minimum input supply requirements. Output Noise Voltage - The RMS AC voltage at the output with a constant load and no input ripple, measured over a specified frequency range. Maximum Power Dissipation - The maximum total dissipation for which the regulator will operate within specifications. Quiescent Current - Current which is used to operate the regulator chip and is not delivered to the load. Line Regulation - The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected. Maximum Package Power Dissipation - The maximum package power dissipation is the power dissipation level at which the junction temperature reaches its maximum value i.e. 150C. The junction temperature is rising while the difference between the input power (VCC X ICC) and the output power (Vout X Iout) is increasing. Depending on ambient temperature, it is possible to calculate the maximum power dissipation and so the maximum current as following:
qJA The maximum operating junction temperature TJ is specified at 150C, if TA = 25C, then PD can be found. By neglecting the quiescent current, the maximum power dissipation can be expressed as:
I out Pd J + TR - TA
+V
P D - Vout CC
The thermal resistance of the whole circuit can be evaluated by deliberately activating the thermal shutdown of the circuit (by increasing the output current or raising the input voltage for example). Then you can calculate the power dissipation by subtracting the output power from the input power. All variables are then well known: power dissipation, thermal shutdown temperature (150C for MC33375) and ambient temperature.
R
+ TJP- TA qJA
D
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MC33375
Figure 1. Line Transient Response
7 TA = 25 C 6 CL = 0.47 mF IL = 10 mA 5 Vout = 3.3 V 4 50 3 2 1 0 0 20 40 60 80 100 120 140 160 TIME (mS) 0 Vout -50 Vin 200 OUTPUT VOLTAGE CHANGE (mV) 150 100 7 TA = 25 C 6 CL = 33 mF IL = 10 mA 5 Vout = 3.3 V 4 3 2 1 0 0 50 100 TIME (mS) 150 Vout Vin
Figure 2. Line Transient Response
70 60 50 40 30 20 10 0 -10 -20 200 OUTPUT VOLTAGE CHANGE (mV)
Vin , INPUT VOLTAGE (V)
-100 180 200
Vin , INPUT VOLTAGE (V)
Figure 3. Load Transient Response
300 200 100 LOAD CURRENT (mA) 0 -100 -200 -300 -400 CL = 1.0 mF Vout = 3.3 V -500 TA = 25 C -600 Vin = 4.3 V -700 0 50 100 Vout CHANGE -0.2 -0.4 -0.6 -0.8 150 200 250 300 350 -1.0 400 LOAD CURRENT 1.0 0.8 OUTPUT VOLTAGE CHANGE (V) 0.6 0.4 0.2 0 LOAD CURRENT (mA)
350 250 150 50 -50 -150 -250 -350 -450 -550 -650 -750 0
Figure 4. Load Transient Response
0.14
OUTPUT VOLTAGE CHANGE (V)
LOAD CURRENT
0.09 0.04 -0.01
Vout CHANGE
CL = 33.0 mF Vout = 3.3 V TA = 25 C Vin = 4.3 V
-0.06 -0.11 -0.16
50
100
150
200
250
300
TIME (mS)
TIME (mS)
Figure 5. Output Voltage versus Input Voltage
3.5 3.0 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) DROPOUT VOLTAGE (mV) OUTPUT VOLTAGE (V) IL = 1 mA
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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MC33375
Figure 7. Dropout Voltage versus Temperature
300 250 200 Ignd (mA) 150 100 50 0 -40 IL = 250 mA IL = 100 mA 12 10 8 6 4 IL = 100 mA IL = 10 mA 0 25 TEMPERATURE (C) 85 2 IL = 50 mA 0 0 1 2 3 4 Vin (VOLTS) 5 6 7 8 IL = 300 mA
Figure 8. Ground Pin Current versus Input Voltage
DROPOUT VOLTAGE (mV)
IL = 300 mA
Figure 9. Ground Pin Current versus Ambient Temperature
8 7 6 Ignd (mA) 5 4 3 2 1 0 -40 -20 0 20 40 60 80 IL = 50 mA 100 120 140 2.475 2.47 -40 IL = 100 mA Vout (VOLTS) 2.49 2.485 2.48 IL = 250 mA 2.5 2.495
Figure 10. Output Voltage versus Ambient Temperature (Vin = Vout + 1V)
IO = 0
IO = 250 mA
0
25 TEMPERATURE (C)
85
TA (C)
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MC33375
Figure 11. Output Voltage versus Ambient Temperature (Vin = 12 V)
2.5 2.495 2.49 Vout (VOLTS) 2.485 2.48 2.475 2.47 2.465 -40 0 25 85 IO = 250 mA IO = 0
TEMPERATURE (C)
Figure 12. Ripple Rejection
70 60 IL = 10 mA 50 IL = 1 mA dB dB 40 30 20 10 0 0.1 1 FREQUENCY (kHz) 10 100 40 30 20 10 0 0.1 50 70 60
Figure 13. Ripple Rejection
IL = 100 mA IL = 250 mA
1 FREQUENCY (kHz)
10
100
Figure 14. Enable Transient
5 4.5 4 VOLTAGE (V) 3.5 3 2.5 2 1.5 1 0.5 0 0 100 200 TIME (mS) 300 400 500 CL = 33 mF CL = 1.0 mF ENABLE
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MC33375
1.8 V Option
Figure 15. Output Voltage versus Temperature
1.85 1.84 VOUT , OUTPUT VOLTAGE (V) 1.83 1.82 1.81 1.80 1.79 1.78 1.77 1.76 1.75 -40 ILOAD = 100 mA VOUT, OUTPUT VOLTAGE (V) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 -20 0 20 40 60 80 100 120 0 1 2 3 VCC, (V) 4 TA, AMBIENT TEMPERATURE (C) TA = 25 C ILOAD = 0 mA 5 6
Figure 16. Output Voltage versus Input Voltage
12 10 8 Ignd , (mA) 6 4 2 0 0
Figure 17. Ground Current versus Load Current
Figure 18. Quiescent Current versus Input Voltage
140 120
TA = 25 C VCC = 3 V IQ (m A)
100 80 60 40 20 0 TA = 25 C ILOAD = 0 mA 0 1 2 3 VCC, (V) 4 5 6
50
100
150
200
250
300
350
ILOAD, (mA)
Figure 19. PSRR versus Frequency
80 70 60 PSRR (dB) 50 40 30 20 10 0 0.1 1 10 f, FREQUENCY (kHz) 100 1000 0 5
Figure 20. Enable Response
VCC = 3 V ILOAD = 1 mA TA = 25C COUT = 1 mF 2V
ENABLE VOUT
0V
10
15
20
25
30
35
40
45
50
t, TIME (ms)
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MC33375
Figure 21. Load Transient Response
VCC = 3 V ILOAD = 1 mA to 100 mA TA = 25C 1.82 V 1.80 V 1.78 V 100 mA 1 mA
0
0.5
1
1.5
2
2.5 t, TIME (ms)
3
3.5
4
4.5
5
APPLICATIONS INFORMATION
Figure 22. Typical Application Circuit
ON/OFF Vout MC33375-xx Cin Cout LOAD
Vin
GND
The MC33375 regulators are designed with internal current limiting and thermal shutdown making them user-friendly. Figure 15 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
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 16 shows the ESR that allows the LDO to remain stable for various load currents.
Figure 23. ESR for Vout = 3.0V
100 Vout = 3.0 V Cout = 1.0 mF Cin = 1.0 mF ESR (ohm) 10 Stable Region 1.0
These regulators require only a 0.33 mF (or greater) capacitance between the output and ground for stability for 1.8 V, 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 MC33375. If the output capacitor must be mounted further than two centimeters away from the MC33375, 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 25C. 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
0.1 0 50 100 150 200 250 300 LOAD CURRENT (mA)
Applications should be tested over all operating conditions to insure stability.
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MC33375
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 150C, 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 150C 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 150C, 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 MC33375.
ON/OFF PIN
When this pin is pulled low, the MC33375 is off. This pin should not be left floating. The pin should be pulled high for the MC33375 to operate.
Figure 24. SOT-223 Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
Free Air Mounted Vertically PD(max) for TA = 50C 2.0 oz. Copper L 1.25 0.83 0.63 0.50 0.42 0.35 0 5.0 10 15 20 25 30 L, LENGTH OF COPPER (mm) PD, MAXIMUM POWER DISSIPATION (W) 280 R JA, THERMAL RESISTANCE JUNCTION-TO-AIR (C/W) 240 200 160 120 80 40 Minimum Size Pad 2.50
RJA
R JA, THERMAL RESISTANCE, JUNCTION-TO-AIR (C/W)
Figure 25. SOP-8 Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
3.2 PD(max) for TA = 50C 2.8 2.4 Graph Represents Symmetrical Layout 2.0 L RJA 50 30 0 10 20
170 150 130 110 90 70
L, LENGTH OF COPPER (mm)
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IIIIIII IIIIIII IIIIIII
2.0 oz. Copper L
30
IIII IIII IIII
L 3.0 mm 40
1.6 1.2 0.8 0.4
50
MC33375
ORDERING INFORMATION
MC33375ST-1.8T3 MC33375ST-2.5T3 MC33375D-2.5R2 MC33375ST-3.0T3 MC33375D-3.0R2 MC33375ST-3.3T3 MC33375D-3.3R2 MC33375ST-5.0T3 MC33375D-5.0R2 1.8 V (Fixed V) 2.5 V (Fixed Voltage) 3.0 V (Fixed Voltage) 3.3 V (Fixed Voltage) 5.0 V (Fixed Voltage) 1% Tolerance at TA = 25C 2% Tolerance at TJ from -40 to +125C 318E 318E 751-5 318E 751-5 318E 751-5 318E 751-5 SOT-223 SOT-223 SOP-8 SOT-223 SOP-8 SOT-223 SOP-8 SOT-223 SOP-8
DEVICE MARKING
Device MC33375 MC33375 MC33375 MC33375 MC33375 Version 1.8V 2.5V 3.0V 3.3V 5.0V Marking (1st line) 37518 37525 37530 37533 37550
TAPE AND REEL SPECIFICATIONS
Device MC33375D MC33375ST Reel Size 13" 13" Tape Width 12mm embossed tape 8mm embossed tape Quantity 2500 units 4000 units
MAXIMUM RATINGS (TA = 25C, for min/max values TJ = -40C to +125C)
Rating Input Voltage Power Dissipation and Thermal Characteristics TA = 25C Maximum Power Dissipation Case 751 (SOP-8) D Suffix Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 318E (SOT-223) ST Suffix Thermal Resistance, Junction-to-Air Thermal Resistance, Junction-to-Case Output Current Maximum Junction Temperature Operating Junction Temperature Range Storage Temperature Range Symbol VCC Value 13 Unit Vdc
PD RJA RJC RJA RJC IO TJ TJ Tstg
Internally Limited 160 25 245 15 300 150 - 40 to +125 - 65 to +150
W C/W C/W C/W C/W mA C C C
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MC33375
PACKAGE DIMENSIONS
A F
ST SUFFIX PLASTIC PACKAGE CASE 318E-04 (SOT-223) ISSUE J
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH.
4
S
1 2 3
B
D L G J C 0.08 (0003) H M K
INCHES DIM MIN MAX A 0.249 0.263 B 0.130 0.145 C 0.060 0.068 D 0.024 0.035 F 0.115 0.126 G 0.087 0.094 H 0.0008 0.0040 J 0.009 0.014 K 0.060 0.078 L 0.033 0.041 M 0_ 10 _ S 0.264 0.287
MILLIMETERS MIN MAX 6.30 6.70 3.30 3.70 1.50 1.75 0.60 0.89 2.90 3.20 2.20 2.40 0.020 0.100 0.24 0.35 1.50 2.00 0.85 1.05 0_ 10 _ 6.70 7.30
D SUFFIX PLASTIC PACKAGE CASE 751-06 (SOP-8) ISSUE T
A
8
D
5
C
E
1 4
H
0.25
M
B
M
h B C e A
SEATING PLANE
X 45 _
NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_
q
L 0.10 A1 B 0.25
M
CB
S
A
S
q
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MC33375
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PUBLICATION ORDERING INFORMATION
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MC33375/D

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