LD1085C SERIES 3A LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED ■ ■ ■ ■ ■ ■ ■ ■ TYPICAL DROPOUT 1.3V (AT 3A) THREE TERMINAL ADJUSTABLE OR FIXED OUTPUT VOLTAGE 1.8V, 2.5V, 2.85V, 3.3V, 3.6V, 5V, 8V, 9V, 12V. GUARANTEED OUTPUT CURRENT UP TO 3A OUPUT TOLERANCE ±2% AT 25°C AND ±3% IN FULL TEMPERATURE RANGE INTERNAL POWER AND THERMAL LIMIT WIDE OPERATING TEMPERATURE RANGE -40°C TO 125°C PACKAGE AVAILABLE : DPAK PINOUT COMPATIBILITY WITH STANDARD ADJUSTABLE VREG DESCRIPTION The LD1085 is a LOW DROP Voltage Regulator able to provide up to 3A of Output Current. Dropout is guaranteed at a maximum of 1.5V at the maximum output current, decreasing at lower loads. The LD1085 is pin to pin compatible with the older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance . DPAK A 2.85V output version is suitable for SCSI-2 active termination. Unlike PNP regulators, where a part of the output current is wasted as quiescent current, the LD1085 quiescent current flows into the load, so increase efficiency. Only a 10µF minimum capacitor is need for stability. The device is supplied in DPAK. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ±2% at 25°C. SCHEMATIC DIAGRAM September 2001 1/14 LD1085C SERIES ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VI DC Input Voltage 30 V IO Output Current Internally Limited mA PD Power Dissipation Internally Limited mW Tstg Storage Temperature Range -55 to +150 °C Top Operating Junction Temperature Range -40 to +125 °C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Parameter R thj-case Thermal Resistance Junction-case R thj-amb Thermal Resistance Junction-ambient DPAK APPLICATION CIRCUITS R2 VO = VREF (1 + ) R1 2/14 Unit 3 °C/W 62.5 °C/W LD1085C SERIES CONNECTION DIAGRAM (top view) DPAK ORDERING CODES DPAK (*) OUTPUT VOLTAGE LD1085CDT18 LD1085CDT25 LD1085CDT28 LD1085CDT33 LD1085CDT36 LD1085CDT50 LD1085CDT80 LD1085CDT90 LD1085CDT120 LD1085CDT 1.8 V 2.5 V 2.85 V 3.3 V 3.6 V 5.0 V 8.0 V 9.0 V 12.0 V ADJ (*) Available in Tape & Reel with the suffix ”R” for fixed version and ”-R” for adjustable version. 3/14 LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT18 (VI=4.8V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditions Output Voltage IO = 0 mA Line Regulation IO = 0 to 3A VI = 3.4 to 30V (note 1) IO = 0 mA VI = 3.4 to 18V TJ = 25°C TJ = 25°C IO = 0 mA Typ. Max. Unit 1.764 1.8 1.836 V 1.746 1.8 1.854 V VI = 3.4 to 15V ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A Vd Dropout Voltage IO =3 A Iq Quiescent Current V I ≤ 30V Isc Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 7.5 ± 3V eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability SVR Min. 3.2 0.2 0.2 4 mV 0.4 4 mV 2 10 mV 4 20 V 1.3 1.5 V 5 10 mA 4.5 0.5 0.003 60 f =10Hz to 10KHz T A = 125°C 1000Hrs A A 0.015 %/W 75 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS OF LD1085CDT25 (VI=5.5V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol Parameter Test Conditions VO Output Voltage ∆VO Line Regulation ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A Vd Dropout Voltage IO =3 A Iq Quiescent Current V I ≤ 30V Isc Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 7.5 ± 3V eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability IO = 0 mA TJ = 25°C IO = 0 to 3A VI = 4.1 to 30V (note 1) SVR IO = 0 mA VI = 4.1 to 18V IO = 0 mA VI = 4.1 to 18V Typ. Max. Unit 2.45 2.5 2.55 V 2.5 2.575 V 0.2 5 mV 0.4 5 mV 2 10 mV 2.425 TJ = 25°C 3.2 0.2 f =10Hz to 10KHz T A = 125°C 1000Hrs NOTE 1: See short-circuit current curve for available output current at fixed dropout. 4/14 Min. 4 20 V 1.3 1.5 V 5 10 mA 4.5 0.5 0.008 60 A A 0.04 %/W 72 dB 0.003 % 0.5 0.5 % % LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT285 (VI=5.85V, C I = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditio ns Output Voltage IO = 0 mA Line Regulation IO = 0 to 3A VI = 4.5 to 30V (note 1) IO = 0 mA VI = 4.5 to 18V TJ = 25°C TJ = 25°C IO = 0 mA Typ. Max. Unit 2.793 2.85 2.907 V 2.765 2.85 2.935 V VI = 4.5 to 18V ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A Vd Dropout Voltage IO =3 A Iq Quiescent Current VI ≤ 30V Isc Short Circuit Current VI - VO = 5V VI - VO = 25V Termal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 7.85 ± 3V eN RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz S S Temperature Stability Long Term Stability TA = 125°C 1000Hrs SVR Min. 3.2 0.2 0.2 6 mV 0.5 6 mV 3 15 mV 7 20 V 1.3 1.5 V 5 10 mA 4.5 0.5 0.008 60 A A 0.04 %/W 72 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS OF LD1085CDT33 (VI=6.3V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol Parameter Test Conditio ns VO Output Voltage ∆VO Line Regulation ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A Vd Dropout Voltage IO =3 A Iq Quiescent Current VI ≤ 30V Isc Short Circuit Current VI - VO = 5V VI - VO = 25V Termal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 5A VI = 8.3 ± 3V eN RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz S S Temperature Stability Long Term Stability TA = 125°C 1000Hrs IO = 0 mA TJ = 25°C IO = 0 to 3A VI = 4.9 to 30V (note 1) SVR IO = 0 mA VI = 4.9 to 18V IO = 0 mA VI = 4.9 to 18V Min. Typ. Max. Unit 3.234 3.35 3.366 V 3.201 3.35 3.399 V 0.5 6 mV TJ = 25°C 3.2 0.2 1 6 mV 3 15 mV 7 20 V 1.3 1.5 V 5 10 mA 4.5 0.5 0.008 60 A A 0.04 %/W 72 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. 5/14 LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT36 (VI=6.6V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditions Output Voltage IO = 0 mA Line Regulation IO = 0 to 3A VI = 5.2 to 30V (note 1) IO = 0 mA VI = 5.2 to 18V TJ = 25°C TJ = 25°C IO = 0 mA Typ. Max. Unit 3.528 3.6 3.672 V 3.492 3.6 3.708 V 0.5 10 mV 1 10 mV 3 15 mV VI = 5.2 to 18V ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A Vd Dropout Voltage IO =3 A Iq Quiescent Current V I ≤ 30V Isc Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 8.6 ± 3V eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability SVR Min. 3.2 0.2 7 20 V 1.3 1.5 V 5 10 mA 4.5 0.5 0.008 60 f =10Hz to 10KHz T A = 125°C 1000Hrs A A 0.04 %/W 72 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS OF LD1085CDT50 (VI=8V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol Parameter Test Conditions IO = 0 mA TJ = 25°C Min. Typ. Max. Unit 4.9 5 5.1 V 5 5.15 V 0.5 10 mV VO Output Voltage ∆VO Line Regulation ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A 10 35 V Vd Dropout Voltage IO =3 A 1.3 1.5 V Iq Quiescent Current V I ≤ 30V 5 10 mA Isc Short Circuit Current V I - VO = 5V 3.2 4.5 A 0.2 0.5 A Termal Regulation V I - VO = 25V T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 10 ± 3V 60 eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability IO = 0 to 3A VI = 6.6 to 30V (note 1) SVR IO = 0 mA VI = 6.6 to 20V IO = 0 mA VI = 6.6 to 20V f =10Hz to 10KHz T A = 125°C 1000Hrs NOTE 1: See short-circuit current curve for available output current at fixed dropout. 6/14 4.85 TJ = 25°C 1 10 mV 5 20 mV 0.008 0.04 %/W 72 dB 0.003 % 0.5 0.5 % % LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT80 (VI=11V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditions Output Voltage IO = 0 mA Line Regulation IO = 0 to 3A VI = 9.8 to 30V (note 1) IO = 0 mA VI = 9.8 to 20V TJ = 25°C TJ = 25°C IO = 0 mA Min. Typ. Max. Unit 7.84 8 8.16 V 7.76 8 8.24 V 1 18 mV 2 18 mV 8 30 mV VI = 9.8 to 20V ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A 12 60 V Vd Dropout Voltage IO =3 A 1.3 1.5 V Iq Quiescent Current V I ≤ 30V 5 10 mA Isc Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 13 ± 3V eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability SVR 3.2 0.2 4.5 0.5 0.008 54 f =10Hz to 10KHz T A = 125°C 1000Hrs A A 0.04 %/W 71 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS OF LD1085CDT90 (VI=12V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditions Output Voltage IO = 0 mA Line Regulation IO = 0 to 3A VI = 11 to 30V (note 1) IO = 0 mA VI = 11 to 20V TJ = 25°C IO = 0 mA TJ = 25°C Min. Typ. Max. Unit 8.82 9 9.18 V 8.73 9 9.27 V VI = 11 to 20V 1 20 mV 2 20 mV 8 30 mV ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A 12 60 V Vd Dropout Voltage IO =3 A 1.3 1.5 V Iq Quiescent Current V I ≤ 30V 5 10 mA Isc Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 14 ± 3V eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability SVR 5.5 0.5 f =10Hz to 10KHz T A = 125°C 1000Hrs 6.5 0.7 0.008 54 A A 0.04 %/W 70 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. 7/14 LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT120 (VI=15V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditions Output Voltage IO = 0 mA Line Regulation IO = 0 to 3A VI = 13.8 to 30V (note 1) IO = 0 mA VI = 13.8 to 25V TJ = 25°C TJ = 25°C IO = 0 mA Min. Typ. Max. Unit 11.76 12 12.24 V 11.64 12 12.36 V VI = 13.8 to 25V 1 25 mV 2 25 mV 12 36 mV ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A 24 72 V Vd Dropout Voltage IO =3 A 1.3 1.5 V Iq Quiescent Current V I ≤ 30V 5 10 mA Isc Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, C O = 25 µF, IO = 3A V I = 17 ± 3V eN RMS Output Noise Voltage (% of VO) T A = 25°C S S Temperature Stability Long Term Stability SVR 3.2 0.2 4.5 0.5 0.008 54 f =10Hz to 10KHz T A = 125°C 1000Hrs A A 0.04 %/W 66 dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. ELECTRICAL CHARACTERISTICS OF LD1085CDT (VI=4.25V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO Parameter Output Voltage Test Conditions IO = 10mA TJ = 25°C IO = 10mA to 5AVI = 2.85 to 30V (note 1) ∆VO ∆VO Vd Line Regulation Load Regulation Dropout Voltage Min. Typ. Max. Unit 1.225 1.25 1.275 V 1.213 1.25 1.288 V IO = 10mA VI = 2.85 to 16.5V TJ = 25°C 0.015 0.2 % IO = 10mA VI = 2.85 to 16.5V 0.035 0.2 % IO = 10mA to 5ATJ = 25°C 0.1 0.3 % IO = 0 to 5A 0.2 0.4 % IO = 5A 1.3 1.5 V 3 10 mA Minimum Load Current V I = 30V Short Circuit Current V I - VO = 5V V I - VO = 25V Termal Regulation T A = 25°C, 30ms pulse SVR Supply Voltage Rejection f = 120 Hz, IO = 5A C O = 25 µF, C ADJ = 25 µF, VI = 6.25 ± 3V IADJ Adjust Pin Current V I = 4.25V IO = 10 mA 55 120 µA ∆IADJ Adjust Pin Current Change 0.2 5 µA eN RMS Output Noise Voltage (% of VO) IO = 10mA to 5A VI = 2.75 to 16.5V (note 1) f =10Hz to 10KHz T A = 25°C S S Temperature Stability Long Term Stability IO(min) Isc 3.2 0.2 T A = 125°C 1000Hrs NOTE 1: See short-circuit current curve for available output current at fixed dropout. 8/14 4.5 0.5 0.003 60 A A 0.015 75 %/W dB 0.003 % 0.5 0.5 % % LD1085C SERIES TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25°C, CI=CO=10µF) Figure 1 : Output Voltage vs Temperature Figure 4 : Short Circuit Current vs Dropout Voltage Figure 2 : Output Voltage vs Temperature Figure 5 : Line Regulation vs Temperature Figure 3 : Output Voltage vs Temperature Figure 6 : Load Regulation vs Temperature 9/14 LD1085C SERIES Figure 7 : Dropout Voltage vs Temperature Figure 10 : Quiescent Current vs Temperature Figure 8 : Dropout Voltage vs Output Current Figure 11 : Dropout Voltage vs Output Current Figure 9 : Adjust Pin Current vs Temperature Figure 12 : Supply Voltage Rejection vs Output Current 10/14 LD1085C SERIES Figure 13 : Supply Voltage Rejection vs Frequency Figure 16 : Stability Figure 14 : Supply Voltage Rejection vs Temperature Figure 17 : Stability Figure 15 : Minimum Load Current vs Temperature Figure 18 : Line Transient VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO =10µF(tant), CADJ = 1µF 11/14 LD1085C SERIES Figure 19 : Line Transient Figure 21 : Load Transient VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant), C ADJ =1µF VI=12 V, IO =0.12 to 3 A, CI = 1µF(tant), CO=10µF(tant) CADJ =1µF Figure 20 : Load Transient VI=12 V, IO=0.12 to 3 A, CI = 1µF(tant), CO=10µF(tant) C ADJ =1µF 12/14 LD1085C SERIES DPAK MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 2.2 2.4 0.086 0.094 A1 0.9 1.1 0.035 0.043 A2 0.03 0.23 0.001 0.009 B 0.64 0.9 0.025 0.035 B2 5.2 5.4 0.204 0.212 C 0.45 0.6 0.017 0.023 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 E 6.4 6.6 0.252 0.260 G 4.4 4.6 0.173 0.181 H 9.35 10.1 0.368 0.397 L2 L4 0.8 0.6 0.031 1 0.023 0.039 0068772-B 13/14 LD1085C SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringe ment of patents or other righ ts of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this pub lication are subject to change without notice. Thi s pub lication supersedes and replaces all information previously supplied. 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