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TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function
SOP-8
Pin Definition: 1. Output 8. Input 2. Ground 7. Ground 3. Ground 6. Ground 4. Adj 5. Inhibit
General Description
The TS2938 series of fixed-voltage monolithic micro-power voltage regulators is designed for a wide range of applications. This device excellent choice of use in battery-power application. Furthermore, the quiescent current increases on slightly at dropout, which prolongs battery life. This series of fixed-voltage regulators features very low ground current (200uA Typ.), very low drop output voltage (Typ. 60mV at light load and 600mV at 500mA) and output inhibit control. This includes a tight initial tolerance of 2%, extremely good line regulation of 0.05% typ., and very low output temperature coefficient.
Features
Dropout voltage typically 0.5V @Io=500mA Output current up to 500mA Logic Control Electronic Shutdown Output voltage trimmed before assembly -18V Reverse peak voltage +30V Input over voltage protection +60V Transient peak voltage Low Quiescent Current 100uA (Typ.) (On Mode) Internal current limit Thermal shutdown protection
Block Diagram
Ordering Information
Part No. Package Packing
TS2938CSxx RL SOP-8 2.5Kpcs / 13" Reel Note: Where xx denotes voltage option, available are 12= 12V 10= 10V 80= 8.0V 50= 5.0V 33= 3.3V Leave blank for adjustable voltage Contact factory for additional voltage options.
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Version: A07
TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function
Absolute Maximum Rating (Note 1)
Parameter
Input Supply Voltage (Note 2) Operation Input Supply Voltage Power Dissipation (Note 3) Operating Junction Temperature Range Storage Temperature Range
Symbol
VIN VOPR PD TJ TSTG
Limit
-18 ~ +60 26 Internally Limited -40 ~ + 125 -65 ~ +150
Unit
V V W
o o
C C
Electrical Characteristics ( VIN=VOUT+1V, IL=5mA, CO=10uF, TA=25oC, unless otherwise noted)
Parameter
Output Voltage Reference Voltage (Adjustable) Output Voltage Temperature Coefficient Line Regulation Load Regulation Dropout Voltage (Note 4)
Conditions
TA=25 C TA=25~85oC TA=25oC Vo+1V VIN 26V 5mA IL 500mA IL=100mA IL=300mA IL=500mA IL=100uA IL=300mA IL=500mA VOUT =0 CL=2.2uF CL=3.3uF CL=33uF Ratio Low (Regulator ON) High (Regulator OFF) Vinhibit = 2.4V Vinhibit = 26V Vinhibit2V, Vin26V Vout=0V
o
Min
0.980|Vo| 0.960|Vo| 1.21 -------------60 -2.0 ----
Typ
VOUT 1.235 50 0.05 0.2 100 300 500 200 12 25 0.9 500 350 120 -1.3 -30 450 --
Max
1.020|Vo| 1.040|Vo| 1.26 150 0.5 1.0 200 400 600 300 20 50 1.3 ----0.7 -50 600 200
Unit
V V V o ppm/ C % % mV uA mA mA A uVrms dB
Quiescent Current (Note 5) Short Circuit Current (Note 6) Output Noise, 10Hz to 100KHz, IL=10mA Ripple Rejection Shutdown Input Input Logic Voltage Shutdown Pin Input Current Regulator Output Current in Shutdown
V
uA
Thermal Performance
Condition Thermal Resistance Junction to Case Typ 20 Unit
o
C/W
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Version: A07
TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function
Electrical Characteristics (Continue)
Note 1: Absolute Maximum Rating is limits beyond which damage to the device may occur. For guaranteed Specifications and test conditions see the Electrical Characteristics. Note 2: Maximum positive supply voltage of 60V must be limited duration (<100mS) and duty cycle (<1%). Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, Tj, the junction to ambient thermal resistance, ja, and the ambient temperature, Ta. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The effective value of ja can be reduced by using a heatsink. Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V differential. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the ground pin current and output load current. Note 6: Output current will decrease with increasing temperature, but it will be not dropped below 500mA at the maximum specified temperature.
Application Circuit
Fixed Output Voltage Type
Adjustable Output Voltage Type
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Version: A07
TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function
Application Information
Application
The TS2938 series is a high performance with low dropout voltage regulator suitable for moderate to high current and voltage regulator application. Its 500Mv (typ) dropout voltage at full load and over temperature makes it especially valuable in battery power systems and as high efficiency noise filters in post regulator applications. Unlike normal NPN transistor design, where the base to emitter voltage drop and collector to emitter saturation voltage limit the minimum dropout voltage, dropout performance of the PNP output of these devices is limited only by low Vce saturation voltage. The TS2938 series is fully protected from damage due to fault conditions. Linear current limiting is provided. Output current during overload conditions is constant. Thermal shutdown the device when the die temperature exceeds the maximum safe operating temperature. Transient protection allows device 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.
Output Capacitor
The TS2938 series requires an output capacitor to maintain stability and improve transient response. Proper capacitor selection is important to ensure proper operation. The output capacitor selection is dependent upon the ESR of the output capacitor the maintain stability. When the output capacitor is 6.8uF or greater, the output capacitor should have an ESR less than 2 ohm. This will improve transient response as well as promoted stability. Ultra low ESR capacitors (<100mohm), such as ceramic chip capacitors may promote instability. These very low ESR levels may cause an oscillation and/or under damped transient response. A low ESR solid tantalum capacitor works extremely well and provide good transient response and stability over temperature. Aluminum electrolytic can also be used, as long as the ESR of the capacitor is <2ohm. The value of the output capacitor can be increased without limit. Higher capacitance values help to improved transient response and ripple rejection and reduce output noise.
Minimum Load Current
The TS2938 series is specified between finite loads. If the output current is too small leakage currents dominate and the output voltage rises. A 5mA minimum load current is necessary for proper regulation.
Input Capacitor
An input capacitor of 1uF or greater is recommended when the device is more that 4 inches away from the bulk AC supply capacitance or when the supply is a battery. Small and surface mount ceramic chip capacitors can be used for bypassing. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage.
Adjustable Regulator Design
The adjustable regulator versions is allow to programming the output voltage anywhere between 1.25 and the 26V maximum operating rating of the family. Two resistors are used. Resistors can be quite large up to 1M, because of the very high input impedance and low bias current of the sense comparator, the resistor values are calculated by:
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Version: A07
TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function
Application Information (Continue)
Thermal Characteristics
A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible operating conditions, the junction temperature must be within the range specified under absolute maximum ratings. To determine if the heatsink is required, the power dissipated by the regulator, PD must be calculated. The below formula shows the voltages and currents for calculating the PD in the regulator: IIN = IL / IG PD = (VIN-VOUT) * IL + (VIN) * IG Ex. PD = (3.3V-2.5V) * 0.5A + 3.3V * 11mA = 400mW + 36mW = 436mW The next parameter which must be calculated the maximum allowable temperature rise. TR(max) is calculated by the using to formula: TR(max) = TJ(max) - TA(max) o Where: TJ(max) is the maximum allowable junction temperature, which is 125 C for commercial grade parts. TA(max) is the maximum ambient temperature which will be encountered in the application. Using the calculated values for TA(max) and PD, the maximum allowable value for the junction to ambient thermal resistance, JA, can now be found: JA = TR(max) / PD
Inhibit Input
TS2938 feature an active-low (Inhibit) input that allows ON/OFF control of the regulator. The Inhibit input has TTL/CMOS compatible thresholds for simple interfacing with logic interfacing. Inhibit should be directly tied to Ground or keep open (not connected).
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Version: A07
TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function SOP-8 Mechanical Drawing
DIM A B C D F G K M P R
SOP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0 7 0 7 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019
Marking Diagram
Y M = Year Code = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) = Lot Code = Voltage Code (1.8=1.8V, 2.5=2.5V, 3.3=3.3V, 5.0=5V, 12=12V) = Leave the Blank for Adjustable type
L XX
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Version: A07
TS2938
500mA Ultra Low Dropout Voltage Regulator with Inhibit Function
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC's terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale.
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Version: A07

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