The LD2940 is a low dropout three-terminal regulator with a typical dropout of 280mV at 1A output current.

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1A Ultra Low Dropout Voltage Regulator 1A Ultra Low Dropout Voltage Regulator General Description The LD2940 is a low dropout three-terminal regulator with a typical dropout of 280mV at 1A output

On-chip thermal shutdown provides protection against any combination of high current and ambient temperature that would create excessive junction temperatures. TO-263-3 The LD2940 has 1.2V, 1.8V, 2.

1 1A Ultra Low Dropout Voltage Regulator 1A Ultra Low Dropout Voltage Regulator General Description The LD2940 is a low dropout three-terminal regulator with a typical dropout of 280mV at 1A output current. TO-220 The LD2940 provides current limit and thermal shutdown. On-chip thermal shutdown provides protection against any combination of high current and ambient temperature that would create excessive junction temperatures. TO The LD2940 has 1.2V, 1.8V, 2.5V, 3.3V and 5.0V versions. The LD2940 series is available in the industry standard TO-220, TO-263-3, DPAK(TO-252) and SOT-223 power packages. (Detailed information please refer to page 2 &3) SOT-223 Features Minimum Guaranteed Output Current: 1A Dropout Voltage at IOUT=1A: 280mV Typ. (Except 1.2V and 1.8V Versions) Output Accuracy: ± 1% Low Ground Current Internal Current Limit and Thermal Protection Reversed-battery and Reversed-lead Insertion Protection Fast Transient Response DPAK (TO-252) Applications LCD TV Set Top Box LCD Monitor SMPS Post Regulator Laptop, Palmtop and Notebook Portable Instrumentation USB Power Supply TAITRON COMPONENTS INCORPORATED Tel: (800)-TAITRON (800) (661) Fax: (800)-TAITFAX (800) (661) Page 1 of 21

2 Ordering Information LD Packing Code Circuit Type TR30: 13 Reel, RoHS Io=1A, Vimax=16V RG30: 13 Reel, RoHS & Halogen Free TU: Tube, RoHS Outline UG: Tube, RoHS & Halogen Free T: TO-220 M: TO Factory Location Code D: DPAK(TO-252) H: SOT : Fixed Output 1.2V 1.8: Fixed Output 1.8V 2.5: Fixed Output 2.5V 3.3: Fixed Output 3.3V 5.0: Fixed Output 5.0V Marking Information Outline PN Marking Code Temperature Range Halogen ROHS Halogen Free ROHS Free TO C to 125 C LD2940T TU LD2940T UG AZ2940T AZ2940T -3.3E1-3.3G1 LD2940T TU LD2940T UG AZ2940T AZ2940T -5.0E1-5.0G1 LD2940M TU LD2940M UG AZ2940S AZ2940S -3.3E1-3.3G1 TO C to 125 C LD2940M TR30 LD2940M RG30 AZ2940S AZ2940S -3.3E1-3.3G1 LD2940M TU LD2940M UG AZ2940S AZ2940S -5.0E1-5.0G1 LD2940M TR30 LD2940M RG30 AZ2940S AZ2940S -5.0E1-5.0G1 LD2940D UG AZ2940D -1.2G1 LD2940D RG30 AZ2940D -1.2G1 AZ2940D AZ2940D LD2940D TU LD2940D UG DPAK -1.8E1-1.8G1-40 C to 125 C (TO-252) AZ2940D AZ2940D LD2940D TR30 LD2940D RG30-1.8E1-1.8G1 LD2940D TU LD2940D UG AZ2940D AZ2940D -2.5E1-2.5G1 LD2940D TR30 LD2940D RG30 AZ2940D AZ2940D -2.5E1-2.5G1 Packing Type Tube Tube Tube Tape & Reel Tube Tape & Reel Tube Tape & Reel Tube Tape & Reel Tube Tape & Reel Page 2 of 21

3 Outline DPAK (TO-252) PN Marking Code Temperature Range Halogen ROHS Halogen Free ROHS Free AZ2940D AZ2940D LD2940D TU LD2940D UG -3.3E1-3.3G1 AZ2940D AZ2940D LD2940D TR30 LD2940D RG30-3.3E1-3.3G1-40 C to 125 C AZ2940D AZ2940D LD2940D TU LD2940D UG -5.0E1-5.0G1 AZ2940D AZ2940D LD2940D TR30 LD2940D RG30-5.0E1-5.0G1 SOT C to 125 C LD2940H RG30 GH12B LD2940H RG30 GH12F LD2940H RG30 GH12G LD2940H RG30 GH12H LD2940H RG30 GH12J Packing Type Tube Tape & Reel Tube Tape & Reel Tape & Reel Pin Configuration (Top View) TO-220 TO DPAK(TO-252) SOT Page 3 of 21

4 Pin Description Pin Number Pin Name Function 1 VIN Unregulated Input 2 GND Ground pin. This pin and TAB are internally connected 3 VOUT Regulated output Functional Block Diagram Page 4 of 21

5 Absolute Maximum Ratings (Note 1) 1A Ultra Low Dropout Voltage Regulator Symbol Description Ratings Unit VIN Input Voltage 16 V TJ Operating Junction Temperature 150 C TSTG Storage Temperature Range -65 to 150 C TLEAD (10 sec) Lead Soldering Temperature 260 C TO θja Thermal Resistance TO DPAK (TO-252) 100 C/W SOT ESD ESD (Machine model) 300 V ESD ESD (Human Body model) 5000 V Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Symbol Description Min. Max. Unit VIN Input Voltage V TJ Operating Junction Temperature C Page 5 of 21

6 Electrical Characteristics For LD (VIN=2.5V, IOUT=10mA, CIN=10μF, COUT=10μF, TJ=25 C, Bold typeface applies over - 40 o C TJ 125 o C, unless otherwise specified.) Symbol Description Min. Typ. Max. Unit Conditions VOUT Output Voltage IOUT=10mA V mA IOUT 1A, 2.5V VIN 13.2V VRLINE Line Regulation mv IOUT=10mA, 2.5V VIN 13.2V VRLOAD Load Regulation mv VIN=2.5V, 10mA IOUT 1A VOUT/ T IGND Out Voltage Temperature Coefficient Ground Current 180 µv/ C IOUT=10mA IOUT=750mA ma VIN=2.5V 18 IOUT=1A ISC Short Circuit Current A VOUT=0V (Note 2) ILOAD(MIN) Minimum Load Current 1 5 ma θjc Output Noise Voltage (rms) 400 µv Thermal Resistance Note 2: VIN=VOUT(NOMINAL)+1V 10Hz to 100KHz, IOUT=100mA, COUT=10µF 7.8 DPAK(TO-252) C/W 29.7 SOT Page 6 of 21

7 For LD (VIN=2.8V, IOUT=10mA, CIN=10μF, COUT=10μF, TJ=25 C, Bold typeface applies over - 40 o C TJ 125 o C, unless otherwise specified.) Symbol Description Min. Typ. Max. Unit Conditions VOUT Output Voltage IOUT=10mA V mA IOUT 1A, 2.8V VIN 13.2V VRLINE Line Regulation mv IOUT=10mA, 2.8V VIN 13.2V VRLOAD Load Regulation mv VIN=2.8V, 10mA IOUT 1A VOUT/ T Out Voltage Temperature Coefficient VDROP Dropout Voltage (Note 3) IGND Ground Current µv/ C IOUT=10mA IOUT=100mA mv VOUT=1% IOUT=1A IOUT=750mA ma VIN=2.8V 18 IOUT=1A ISC Short Circuit Current A VOUT=0V (Note 2) ILOAD(MIN) Minimum Load Current 1 5 ma θjc Output Noise Voltage (rms) 400 µv Thermal Resistance 10Hz to 100KHz, IOUT=100mA, COUT=10µF 7.8 DPAK(TO-252) C/W 29.7 SOT-223 Note 2: VIN=VOUT(NOMINAL)+1V Note 3: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value which is measured at VOUT+1V applied to VIN. In application, VIN should be no less than 2.5V. Page 7 of 21

8 For LD (VIN=3.5V, IOUT=10mA, CIN=10μF, COUT=10μF, TJ=25 C, Bold typeface applies over - 40 o C TJ 125 o C, unless otherwise specified.) Symbol Description Min. Typ. Max. Unit Conditions VOUT Output Voltage IOUT=10mA V mA IOUT 1A, 3.5V VIN 13.2V VRLINE Line Regulation mv IOUT=10mA, 3.5V VIN 13.2V VRLOAD Load Regulation mv VIN=3.5V, 10mA IOUT 1A VOUT/ T Out Voltage Temperature Coefficient VDROP Dropout Voltage (Note 4) IGND Ground Current µv/ C IOUT=10mA IOUT=100mA mv VOUT=1% IOUT=1A IOUT=750mA ma VIN=3.5V 18 IOUT=1A ISC Short Circuit Current A VOUT=0V (Note 2) ILOAD(MIN) Minimum Load Current 1 5 ma θjc Output Noise Voltage (rms) 400 µv Thermal Resistance 10Hz to 100KHz, IOUT=100mA, COUT=10µF 7.8 DPAK(TO-252) C/W 29.7 SOT-223 Note 2: VIN=VOUT(NOMINAL)+1V Note 4: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value which is measured at VOUT+1V applied to VIN. Page 8 of 21

9 For LD (VIN=4.3V, IOUT=10mA, CIN=10μF, COUT=10μF, TJ=25 C, Bold typeface applies over - 40 o C TJ 125 o C, unless otherwise specified.) Symbol Description Min. Typ. Max. Unit Conditions VOUT Output Voltage IOUT=10mA V mA IOUT 1A, 3.5V VIN 13.2V VRLINE Line Regulation mv IOUT=10mA, 3.5V VIN 13.2V VRLOAD Load Regulation mv VIN=3.5V, 10mA IOUT 1A VOUT/ T Out Voltage Temperature Coefficient VDROP Dropout Voltage (Note 4) IGND Ground Current µv/ C IOUT=10mA IOUT=100mA mv VOUT=1% IOUT=1A IOUT=750mA ma VIN=3.5V 18 IOUT=1A ISC Short Circuit Current A VOUT=0V (Note 2) ILOAD(MIN) Minimum Load Current 1 5 ma θjc Output Noise Voltage (rms) 400 µv Thermal Resistance 10Hz to 100KHz, IOUT=100mA, COUT=10µF 4.4 TO TO C/W 7.8 DPAK(TO-252) 29.7 SOT-223 Note 2: VIN=VOUT(NOMINAL)+1V Note 4: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value which is measured at VOUT+1V applied to VIN. Page 9 of 21

10 For LD (VIN=6V, IOUT=10mA, CIN=10μF, COUT=10μF, TJ=25 C, Bold typeface applies over - 40 o C TJ 125 o C, unless otherwise specified.) Symbol Description Min. Typ. Max. Unit Conditions VOUT Output Voltage IOUT=10mA V mA IOUT 1A, 6V VIN 13.2V VRLINE Line Regulation mv IOUT=10mA, 6V VIN 13.2V VRLOAD Load Regulation mv VIN=6V, 10mA IOUT 1A VOUT/ T Out Voltage Temperature Coefficient VDROP Dropout Voltage (Note 4) IGND Ground Current µv/ C IOUT=10mA IOUT=100mA mv VOUT=1% IOUT=1A IOUT=750mA ma VIN=6V 18 IOUT=1A ISC Short Circuit Current A VOUT=0V (Note 2) ILOAD(MIN) Minimum Load Current 1 5 ma θjc Output Noise Voltage (rms) 400 µv Thermal Resistance 10Hz to 100KHz, IOUT=100mA, COUT=10µF 4.4 TO TO C/W 7.8 DPAK(TO-252) 29.7 SOT-223 Note 2: VIN=VOUT(NOMINAL)+1V Note 4: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value which is measured at VOUT+1V applied to VIN. Page 10 of 21

11 Typical Characteristics Curves Fig.1- Line Regulation Fig.2- Load Regulation Input Voltage (V) Output Current (ma) Fig.3- Ground Current vs. Output Current Fig.4- Ground Current vs. Input Voltage Ground Current (ma) Ground Current (ma) Output Voltage (V) Output Voltage (V) Output Current (ma) Input Voltage (V) Page 11 of 21

12 Fig.5- Dropout Voltage vs. Output Current Fig.6- Ground Current vs. Junction Temperature Output Current (ma) Junction Temperature ( C) Fig.7- Ground Current vs. Junction Temperature Fig.8- Ground Current vs. Junction Temperature Ground Current (ma) Ground Current (ma) Dropout Voltage (mv) Ground Current (ma) Junction Temperature ( C) Junction Temperature ( C) Page 12 of 21

13 Fig.9- Dropout Voltage vs. Junction Temperature Fig.10- Dropout Voltage vs. Junction Temperature Junction Temperature ( C) Junction Temperature ( C) Fig.11- Output Voltage vs. Junction Temperature Fig.12- Output Capacitor ESR vs. Output Current (ma) Output Voltage (V) Output Capacitor ESR (Ω) Dropout Voltage (mv) Dropout Voltage (mv) Junction Temperature ( C) Output Current (ma) Page 13 of 21

14 Fig.13- Output Capacitor ESR vs. Output Current (ma) Fig.14- Load Transient Output Capacitor ESR (Ω) Output Current (ma) Fig.15- Load Transient Fig.16- Line Transient Page 14 of 21

15 Fig.17- Power Dissipation vs. Case Temperature Fig.18- Power Dissipation vs. Case Temperature Case Temperature ( C) Case Temperature ( C) Fig.19- Power Dissipation vs. Case Temperature Power Dissipation (W) Power Dissipation (W) Power Dissipation (W) Case Temperature ( C) Page 15 of 21

16 Typical Applications Note 5: CIN is required if regulator is located far from power supply filter and is recommended to be 0.47μF or greater. To maintain stability, COUT is recommended to be 2.2μF or greater. The ESR of this capacitor is critical, please see curve. Page 16 of 21

17 Dimensions in mm (inch) TO Page 17 of 21

18 TO Page 18 of 21

19 SOT Page 19 of 21

20 DPAK(TO-252) Page 20 of 21

21 How to contact us: US HEADQUARTERS WEST HARRISON PARKAWAY, VALENCIA, CA Tel: (800) TAITRON (800) (661) Fax: (800) TAITFAX (800) (661) TAITRON COMPONENTS MEXICO, S.A.DE C.V. BOULEVARD CENTRAL 5000 INTERIOR 5 PARQUE INDUSTRIAL ATITALAQUIA, HIDALGO C.P MEXICO Tel: Fax: TAITRON COMPONETS INCORPORATED E REPRESENTAÇÕES DO BRASIL LTDA RUA DOMINGOS DE MORAIS, 2777, 2.ANDAR, SALA 24 SAÚDE - SÃO PAULO-SP BRAZIL Tel: Fax: TAITRON COMPONETS INCORPORATED, SHANGHAI REPRESENTATIVE OFFICE METROBANK PLAZA, 1160 WEST YAN AN ROAD, SUITE 1503, SHANGHAI, , CHINA Tel: Fax: Page 21 of 21

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