LD1085C SERIES 3A LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED ■ ■ ■ ■ ■ ■ ■ ■ TYPICAL DROPOUT 1.3V (AT 3A) THREE TERMINAL ADJUSTABLE OR FIXED OUTPUT VOLTAGE 1.5V, 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 October 2003 1/16 LD1085C SERIES ABSOLUTE MAXIMUM RATINGS Symbol Parameter² 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 Rthj-case Thermal Resistance Junction-case Rthj-amb Thermal Resistance Junction-ambient APPLICATION CIRCUITS R2 VO = VREF (1 + ) R1 2/16 DPAK Unit 3 °C/W 62.5 °C/W LD1085C SERIES CONNECTION DIAGRAM (top view) DPAK ORDERING CODES DPAK (*) OUTPUT VOLTAGE LD1085CDT15 LD1085CDT18 LD1085CDT25 LD1085CDT28 LD1085CDT33 LD1085CDT36 LD1085CDT50 LD1085CDT80 LD1085CDT90 LD1085CDT120 LD1085CDT 1.5 V 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. 3/16 LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT15 (VI=4.5V, C I = 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 = 3.1 to 30V (note 1) IO = 0 mA VI = 3.1 to 18V TJ = 25°C TJ = 25°C Load Regulation Typ. 1.47 1.455 V 1.545 V mV mV IO = 0 to 3A TJ = 25°C 2 10 mV IO = 0 to 3A 4 20 V 1.3 1.5 V 5 10 mA Iq Quiescent Current VI ≤ 30V Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 7.5 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs Temperature Stability Long Term Stability 1.53 1.5 4 Isc S S 1.5 4 Dropout Voltage eN Unit 0.2 VI = 3.1 to 15V Vd SVR Max. 0.4 IO = 0 mA ∆VO Min. IO =3 A 4.5 0.5 0.003 60 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 LD1085CDT18 (VI=4.8V, C I = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol Parameter Test Conditions IO = 0 mA TJ = 25°C Min. Typ. Max. Unit 1.764 1.8 1.836 V 1.8 1.854 V 0.2 4 mV 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 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 7.5 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs IO = 0 to 3A VI = 3.4 to 30V (note 1) SVR eN S S Temperature Stability Long Term Stability IO = 0 mA VI = 3.4 to 18V IO = 0 mA VI = 3.4 to 15V NOTE 1: See short-circuit current curve for available output current at fixed dropout. 4/16 1.746 TJ = 25°C 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 A A 0.015 %/W 75 dB 0.003 % 0.5 0.5 % % LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT25 (VI=5.5V, CI = C O =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO ∆VO Parameter Output Voltage Line Regulation Load Regulation Test Conditions IO = 0 mA Min. 2.45 2.5 2.55 V 2.425 2.5 2.575 V IO = 0 mA VI = 4.1 to 18V IO = 0 mA VI = 4.1 to 18V TJ = 25°C 5 mV 5 mV IO = 0 to 3A TJ = 25°C 2 10 mV 4 20 V 1.3 1.5 V 5 10 mA Iq Quiescent Current VI ≤ 30V Short Circuit Current VI - VO = 5V 3.2 IO =3 A VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 7.5 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs Temperature Stability Long Term Stability 0.2 0.4 IO = 0 to 3A Isc S S Unit TJ = 25°C Dropout Voltage eN Max. IO = 0 to 3A VI = 4.1 to 30V (note 1) Vd SVR Typ. 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 LD1085CDT285 (VI=5.85V, C I = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol Parameter Test Conditions IO = 0 mA TJ = 25°C Min. Typ. Max. Unit 2.793 2.85 2.907 V 2.765 2.85 2.935 V 0.2 6 mV 0.5 6 mV 3 15 mV 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 3.2 VI - VO = 25V 0.2 IO = 0 to 3A VI = 4.5 to 30V (note 1) SVR eN S S IO = 0 mA VI = 4.5 to 18V IO = 0 mA VI = 4.5 to 18V TJ = 25°C Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 7.85 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs Temperature Stability Long Term Stability 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. 5/16 LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT33 (VI=6.3V, C I = 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 = 4.9 to 30V (note 1) IO = 0 mA VI = 4.9 to 18V TJ = 25°C TJ = 25°C Load Regulation 3.35 3.366 V 3.35 3.399 V 6 mV 1 6 mV IO = 0 to 3A TJ = 25°C 3 15 mV IO = 0 to 3A 7 20 V 1.3 1.5 V 5 10 mA VI = 4.9 to 18V Iq Quiescent Current VI ≤ 30V Isc Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 5A VI = 8.3 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs S S Temperature Stability Long Term Stability Unit 3.234 Dropout Voltage eN Max. 3.201 Vd SVR Typ. 0.5 IO = 0 mA ∆VO Min. IO =3 A 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 LD1085CDT36 (VI=6.6V, C I = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol Parameter Test Conditions IO = 0 mA TJ = 25°C Min. Typ. Max. Unit 3.528 3.6 3.672 V 3.6 3.708 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 Vd Dropout Voltage IO =3 A Iq Quiescent Current VI ≤ 30V Isc Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 8.6 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs IO = 0 to 3A VI = 5.2 to 30V (note 1) SVR eN S S Temperature Stability Long Term Stability IO = 0 mA VI = 5.2 to 18V IO = 0 mA VI = 5.2 to 18V NOTE 1: See short-circuit current curve for available output current at fixed dropout. 6/16 3.492 TJ = 25°C 1 10 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 % % LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT50 (VI=8V, CI = C O =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 = 6.6 to 30V (note 1) IO = 0 mA VI = 6.6 to 20V TJ = 25°C TJ = 25°C IO = 0 mA ∆VO Load Regulation Min. 5 5.1 V 5 5.15 V VI = 6.6 to 20V 10 mV 1 10 mV IO = 0 to 3A TJ = 25°C 5 20 mV 10 35 V IO =3 A 1.3 1.5 V 5 10 mA Iq Quiescent Current VI ≤ 30V Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 10 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs Temperature Stability Long Term Stability 0.5 IO = 0 to 3A Isc S S Unit 4.9 Dropout Voltage eN Max. 4.85 Vd SVR Typ. 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 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 IO = 0 mA ∆VO Load Regulation TJ = 25°C Min. 8 8.16 V 8 8.24 V VI = 9.8 to 20V 18 mV 18 mV IO = 0 to 3A TJ = 25°C 8 30 mV 12 60 V IO =3 A 1.3 1.5 V 5 10 mA Iq Quiescent Current VI ≤ 30V Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 13 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs Temperature Stability Long Term Stability 1 2 IO = 0 to 3A Isc S S Unit 7.84 Dropout Voltage eN Max. 7.76 Vd SVR Typ. 4.5 0.5 0.008 54 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. 7/16 LD1085C SERIES 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 TJ = 25°C IO = 0 mA ∆VO Min. Load Regulation 9 9.18 V 9 9.27 V VI = 11 to 20V 20 mV 20 mV IO = 0 to 3A TJ = 25°C 8 30 mV 12 60 V IO =3 A 1.3 1.5 V 5 10 mA Iq Quiescent Current VI ≤ 30V Short Circuit Current VI - VO = 5V 5.5 VI - VO = 25V 0.5 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 14 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs Temperature Stability Long Term Stability 1 2 IO = 0 to 3A Isc S S Unit 8.82 Dropout Voltage eN Max. 8.73 Vd SVR Typ. 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. ELECTRICAL CHARACTERISTICS OF LD1085CDT120 (VI=15V, 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 11.76 12 12.24 V 11.64 12 12.36 V 1 25 mV VO Output Voltage ∆VO Line Regulation 2 25 mV ∆VO Load Regulation IO = 0 to 3A TJ = 25°C IO = 0 to 3A 12 36 mV 24 72 V Vd Dropout Voltage IO =3 A 1.3 1.5 V Iq Quiescent Current VI ≤ 30V 5 10 mA Isc Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse Supply Voltage Rejection f = 120 Hz, CO = 25 µF, IO = 3A VI = 17 ± 3V RMS Output Noise Voltage (% of VO) TA = 25°C f =10Hz to 10KHz TA = 125°C 1000Hrs IO = 0 to 3A VI = 13.8 to 30V (note 1) SVR eN S S Temperature Stability Long Term Stability IO = 0 mA VI = 13.8 to 25V IO = 0 mA VI = 13.8 to 25V NOTE 1: See short-circuit current curve for available output current at fixed dropout. 8/16 TJ = 25°C 4.5 0.5 0.008 54 A A 0.04 %/W 66 dB 0.003 % 0.5 0.5 % % LD1085C SERIES ELECTRICAL CHARACTERISTICS OF LD1085CDT (VI=4.25V, CI = CO =10µF, TA = -40 to 125°C, unless otherwise specified.) Symbol VO ∆VO Parameter Test Conditions Output Voltage IO = 10mA Line Regulation IO = 10mA to 5AVI = 2.85 to 30V (note 1) IO = 10mA VI = 2.85 to 16.5V TJ = 25°C IO = 10mA ∆VO Vd Load Regulation Dropout Voltage TJ = 25°C Min. Typ. Max. Unit 1.225 1.25 1.275 V 1.213 1.25 1.288 V 0.015 0.2 % 0.035 0.2 % VI = 2.85 to 16.5V 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 VI = 30V Short Circuit Current VI - VO = 5V 3.2 VI - VO = 25V 0.2 Thermal Regulation TA = 25°C, 30ms pulse SVR Supply Voltage Rejection f = 120 Hz, IO = 5A CO = 25 µF, CADJ = 25 µF, VI = 6.25 ± 3V IADJ Adjust Pin Current VI = 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) TA = 25°C f =10Hz to 10KHz IO(min) Isc S S Temperature Stability Long Term Stability TA = 125°C 1000Hrs 4.5 0.5 0.003 60 A A 0.015 75 %/W dB 0.003 % 0.5 0.5 % % NOTE 1: See short-circuit current curve for available output current at fixed dropout. 9/16 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 10/16 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 11/16 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 12/16 LD1085C SERIES Figure 19 : Line Transient Figure 21 : Load Transient VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant), CADJ =1µF VI=12 V, I O=0.12 to 3 A, CI = 1µF(tant), CO=10µF(tant) CADJ =1µF Figure 20 : Load Transient VI=12 V, I O=0.12 to 3 A, CI = 1µF(tant), CO=10µF(tant) CADJ =1µF 13/16 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 14/16 LD1085C SERIES Tape & Reel DPAK-PPAK MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 330 13.0 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 MAX. 0.504 0.512 14.4 0.519 0.567 Ao 6.80 6.90 7.00 0.268 0.272 0.2.76 Bo 10.40 10.50 10.60 0.409 0.413 0.417 Ko 2.55 2.65 2.75 0.100 0.104 0.105 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 7.9 8.0 8.1 0.311 0.315 0.319 15/16 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 infringement of patents or other rights 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 publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners © 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com 16/16