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TS39300
3A Ultra Low Dropout Positive Voltage Regulator
TO-263 Pin Assignment: 1. Input 2. Ground 3. Output
Low Dropout Voltage 0.4V (typ.) Output Current 3A Low Ground Current
General Description
The TS39300 series are 3A ultra low dropout linear voltage regulators that provide low voltage, high current output with a minimum of external components. The TS39300 offers extremely low dropout (typically 400mV at 3A) and low ground current (typically 36mA at 3A). The TS39300 is ideal for PC add-in cards that need to convert from standard 3.3V to 2.5V or 2.5V to 1.8V. A guaranteed maximum dropout voltage of 500mV over all operating conditions allows the TS39300 to provide 2.5V from a supply as low as 3V, and 1.8V from a supply as low as 2.5V. The TS39300 also has fast transient response for heavy switching applications. The device requires only 47uF of output capacitor to maintain stability and achieve fast transient response.
Features
Dropout voltage typically 0.4V @Io=3A Output current up to 3A Low ground current Current limiting and Thermal shutdown Extremely fast transient response Reversed leakage protection Reverse battery protection
Ordering Information
Part No.
TS39300CZxx TS39300CMxx
Operating Temp.
-40 ~ +125 C
o
Package
TO-220 TO-263
Note: Where xx denotes voltage option, available are 50 = 5.0V 33 = 3.3V 25 = 2.5V 18 = 1.8V
Applications
Battery power equipment LDO linear regulator for PC add-in cards PowerPC
TM

High efficiency linear power supplies High efficiency post regulator for switching supply Low-voltage microcontrollers and digital logic SMPS post regulator
power supplies
Multimedia and PC processor supplies
Absolute Maximum Rating (Note 1)
Supply Voltage Enable Voltage Storage Temperature Range Lead Soldering Temperature (260 C) ESD
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Vin Ven TSTG
-20V ~ +20 +20 -65 ~ +150 5 (Note 3)
V V
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C
S
TS39300
1-6
2005/12 rev. A
Operating Rating (Note 2)
Operation Input Voltage Operation Enable Voltage Power Dissipation (Note 4) Operating Junction Temperature Range Vin (operate) Ven (operate) PD TJ +2.5 ~ +16 +16 Internally Limited -40 ~ +125 V V W
o
C
Electrical Characteristics
Vin = Vout + 1V, Venable= 2.4V, Tj = 25 C, unless otherwise specified.
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Parameter
Output Voltage Output Voltage Line Regulation Load Regulation Output Voltage Temp. Coefficient
Conditions
IL=10mA 10mA IL 3A, Vo+1V Vin 16V IL=10mA, Vo+1V Vin 16V Vin=Vout+1V, 10mAIL3A Note 5 IL=100mA
Min
0.990|Vo| 0.980|Vo| -------------
Typ
5.0/3.3 2.5/1.8 0.06 0.2 40 65 185 250 400 6 10 17 45 4.5
Max
1.010|Vo| 1.020|Vo| 0.5 1.0 100 200 --550 10 20 ----
Unit
V
% % ppm/ C
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Dropout Voltage (Note 6 & 8)
Vout= -1%
IL=750mA IL=1.5A IL=3A IL=100mA
mV
Quiescent Current (Note 7)
Vin=Vout+1V
IL=750mA IL=1.5A IL=3A
mA
Current Limited
Vout=0, Vin=Vout+1V
A
Thermal Performance
Condition
Thermal Resistance Junction to Case Note:
Package type
TO-220 TO-263
Typ
2 2
Unit
o
C/W
1. Exceeding the absolute maximum ratings may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. 4. Pd(max) = (Tj(max) - Ta) + ja, where ja depends upon the printed circuit layout. See "Applications Information". 5. Output voltage temperature coefficient is Vout (worst case) + (Tj(max) - Tj(min)) where Tj(max) is +125 C and Tj(min) o is -40 C. 6. Vdrop = Vin - Vout when Vout decreases to 99% of its nominal output voltage with Vin =Vout - Vin + 1. For output voltages below 2.5V, dropout voltage is the input-to-output voltage differential with the minimum input voltage being 2.5V. Minimum input operating voltage is 2.5V 7. Ignd is the quiescent current. Iin = Ignd + Iout 8. For 2.5V device, Vin = 2.25V (device is in dropout)
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TS39300
2-6
2005/12 rev. A
Typical Application Circuit
Block Diagram
TS39300
3-6
2005/12 rev. A
Application Information Application Information
The TS39300 is a high performance low dropout voltage regulator suitable for moderate to high-current voltage regulator applications. Its 500mV dropout voltage at full load makes it especially valuable in battery-powered systems and a high-efficiency noise filter in post-regulator applications. Unlike older NPN-pass transistor designs, where the minimum dropout voltage is limited by the base-to-emitter voltage drop and collector-to-emitter saturation voltage, dropout performance of PNP output of these devices is limited only by the low V CE saturation voltage. A trade-off for the low dropout voltage is a varying base drive requirement. The TS39300 regulator is fully protected from damage due to fault conditions. Current limiting is provided. This limiting is linear, output current during overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the mzximum safe operating temperature. Transient proection allows device (and load) survival even when the input voltage spikes above and below nominal. The output structure of these regulators allows voltages in excess of the desired output voltage to be applied without reverse current flow. and provides good transient response and stability over temperature. Aluminum electrolytics can also be used, as long as the ESR of the capacitor is 1. The value of the output capacitor can be increased without limit. Higher capacitance values help to improve transient response and ripple rejection and reduce output noise.
Input Capacitor Requirement
An input capacitor of 1uF or greater is recommended when the device is more than 4 inches away from the bulk as supply capacitance, or when the supply is a battery. Small, surface-mount, ceramic chip capacitors can be is used for the bypassing. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage..
Minimum Load Current
The TS39300 regulator is specified between finite loads. If the output current is too small, leakage dominate and the output voltage rises. A 10mA minimum regulator. load current is necessary for proper
Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion
The TS39300 has excellent transient response to variationis in input voltage and load current. The device has been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 47uF output capacitor, preferably tantalum, is all that is required. Larger values help to improve performance even further. By virtue of its low-dropout voltage, this device does not saturate into dropout as readily as similar NPN-based designs. When converting from 3.3V to 2.5V or 2.5V to 1.8V, the NPN-base regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater. To convert down to 2.5V without operating in dropout, NPN-based regulators require an input voltage of 3.7V at the very least. The TS39300 regulator will provide excellent performance with an input as low as 3.0V or 2.5V. This gives the PNP-based regulators a distinct advantage over older, NPN-base linear regulators.
Output Capacitor Requirement
The TS39300 requires an output capacitor to maintain stability and improve transient reponse. Proper capacitor selection is important to ensure proper operation. The TS39300 output capacitor selection is dependent upon the ESR (equivalent series resistance) of the output capacitor to maintain stability. When the output capacitor is 47uF or greater, the output capacitor should have less than 1 of ESR. This will improve transient response as well as promote instability. The very low ESR levels may cause an oscillation and/or underdamped transient response. A low-ESR solid tantalum capacitor works extremely well
TS39300
4-6
2005/12 rev. A
Application Information (continues) Thermal Design
Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires four application-specific parameters: Maximum ambient temperature (Ta) Output Current (Iout) Output Voltage (Vout) Input Voltage (Vin) Ground Current (Ignd) Calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet, where the ground current is taken from data sheet. Pd = (Vin - Vout) x Iout + Vin x Ignd The heat sink thermal resistance is determined by: sa = (Tj(max) - Ta) / Pd - (jc + cs) Where Tj(max) 125 C and cs is between 0 C and o 2 C/W. The heat sink may by significantly reduced in applications where the minimum input voltage is know and is large compared with the dropout voltage and distribute the heat between this resistor and the regulator. The low dropout properties of vertical PNP regulators allow significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a capacitor of at least 1.0uF is needed directly between the input and regulator ground.
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TS39300
5-6
2005/12 rev. A
TO-220 Mechanical Drawing
A
B A
C
B
C
K L
K L
DIM A B C D MIN
TO-220 DIMENSION MILLIMETERS MAX 10.500 4.440 2.940 6.350 1.106 2.715 5.430 14.732 9.017 16.510 4.826 1.397 29.620 2.921 0.610 6.858 10.000 3.240 2.440 0.381 2.345 4.690 12.700 8.382 14.224 3.556 0.508 27.700 2.032 0.255 5.842 INCHES MIN 0.394 0.128 0.096 0.015 0.092 0.092 0.500 0.330 0.560 0.140 0.020 1.060 0.080 0.010 0.230 MAX 0.413 0.175 0.116 0.250 0.040 0.058 0.107 0.581 0.355 0.650 0.190 0.055 1.230 0.115 0.024 0.270
P J I
P
J I
M D
E F GM H I J K L M N
D
F G
TS39300
H
A D
H
E F G
E
O N
O N
O P
TO-263 Mechanical Drawing
E A I H B
B I H
F
E F
DIM A B C D E F G H I J MIN
TO-263 DIMENSION MILLIMETERS MAX 10.500 15.875 0.991 2.660 4.830 1.400 0.730 8.800 1.400 1.520 10.000 14.605 0.508 2.420 4.064 1.118 0.450 8.280 1.140 1.480 INCHES MIN 0.394 0.575 0.020 0.095 0.160 0.045 0.018 0.325 0.044 0.058 MAX 0.413 0.625 0.039 0.105 0.190 0.055 0.029 0.346 0.055 0.060
G C D
G C
6-6
2005/12 rev. A

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