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LD1085C SERIES
3A LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED
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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 25C AND 3% IN FULL TEMPERATURE RANGE INTERNAL POWER AND THERMAL LIMIT WIDE OPERATING TEMPERATURE RANGE -40C TO 125C PACKAGE AVAILABLE : DPAK PINOUT COMPATIBILITY WITH STANDARD ADJUSTABLE VREG
DPAK
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 .
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 10F 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 25C.
SCHEMATIC DIAGRAM
July 2002
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LD1085C SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol VI IO PD Tstg Top DC Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 30 Internally Limited Internally Limited -55 to +150 -40 to +125 Unit V mA mW C 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 Rthj-case Rthj-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient DPAK 3 62.5 Unit C/W C/W
APPLICATION CIRCUITS
R2 VO = VREF (1 + ) R1
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LD1085C SERIES
CONNECTION DIAGRAM (top view)
DPAK
ORDERING CODES
DPAK (*) LD1085CDT15 LD1085CDT18 LD1085CDT25 LD1085CDT28 LD1085CDT33 LD1085CDT36 LD1085CDT50 LD1085CDT80 LD1085CDT90 LD1085CDT120 LD1085CDT
(*) Available in Tape & Reel with the suffix "R" for fixed version and "-R" for adjustable version.
OUTPUT VOLTAGE 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
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LD1085C SERIES
ELECTRICAL CHARACTERISTICS OF LD1085CDT15 (VI=4.5V, CI = C O =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 7.5 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 3.1 to 18V VI = 3.1 to 15V TJ = 25C IO = 0 to 3A VI = 3.1 to 30V (note 1) Min. 1.47 1.455 Typ. 1.5 1.5 0.2 0.4 2 4 1.3 5 4.5 0.5 0.003 75 0.003 0.5 0.5 0.015 Max. 1.53 1.545 4 4 10 20 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1085CDT18 (VI=4.8V, CI = C O =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 7.5 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 3.4 to 18V VI = 3.4 to 15V TJ = 25C IO = 0 to 3A VI = 3.4 to 30V (note 1) Min. 1.764 1.746 Typ. 1.8 1.8 0.2 0.4 2 4 1.3 5 4.5 0.5 0.003 75 0.003 0.5 0.5 0.015 Max. 1.836 1.854 4 4 10 20 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
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LD1085C SERIES
ELECTRICAL CHARACTERISTICS OF LD1085CDT25 (V I=5.5V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 7.5 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 4.1 to 18V VI = 4.1 to 18V TJ = 25C IO = 0 to 3A VI = 4.1 to 30V (note 1) Min. 2.45 2.425 Typ. 2.5 2.5 0.2 0.4 2 4 1.3 5 4.5 0.5 0.008 72 0.003 0.5 0.5 0.04 Max. 2.55 2.575 5 5 10 20 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1085CDT285 (VI=5.85V, C I = C O =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 7.85 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 4.5 to 18V VI = 4.5 to 18V TJ = 25C IO = 0 to 3A VI = 4.5 to 30V (note 1) Min. 2.793 2.765 Typ. 2.85 2.85 0.2 0.5 3 7 1.3 5 4.5 0.5 0.008 72 0.003 0.5 0.5 0.04 Max. 2.907 2.935 6 6 15 20 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
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LD1085C SERIES
ELECTRICAL CHARACTERISTICS OF LD1085CDT33 (VI=6.3V, CI = C O =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 5A VI = 8.3 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 4.9 to 18V VI = 4.9 to 18V TJ = 25C IO = 0 to 3A VI = 4.9 to 30V (note 1) Min. 3.234 3.201 Typ. 3.35 3.35 0.5 1 3 7 1.3 5 4.5 0.5 0.008 72 0.003 0.5 0.5 0.04 Max. 3.366 3.399 6 6 15 20 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1085CDT36 (VI=6.6V, CI = C O =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 8.6 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 5.2 to 18V VI = 5.2 to 18V TJ = 25C IO = 0 to 3A VI = 5.2 to 30V (note 1) Min. 3.528 3.492 Typ. 3.6 3.6 0.5 1 3 7 1.3 5 4.5 0.5 0.008 72 0.003 0.5 0.5 0.04 Max. 3.672 3.708 10 10 15 20 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
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LD1085C SERIES
ELECTRICAL CHARACTERISTICS OF LD1085CDT50 (VI=8V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 10 3V TA = 25C f =10Hz to 10KHz 60 3.2 0.2 Test Conditions TJ = 25C VI = 6.6 to 20V VI = 6.6 to 20V TJ = 25C IO = 0 to 3A VI = 6.6 to 30V (note 1) Min. 4.9 4.85 Typ. 5 5 0.5 1 5 10 1.3 5 4.5 0.5 0.008 72 0.003 0.5 0.5 0.04 Max. 5.1 5.15 10 10 20 35 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1085CDT80 (VI=11V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 13 3V TA = 25C f =10Hz to 10KHz 54 3.2 0.2 Test Conditions TJ = 25C VI = 9.8 to 20V VI = 9.8 to 20V TJ = 25C IO = 0 to 3A VI = 9.8 to 30V (note 1) Min. 7.84 7.76 Typ. 8 8 1 2 8 12 1.3 5 4.5 0.5 0.008 71 0.003 0.5 0.5 0.04 Max. 8.16 8.24 18 18 30 60 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
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LD1085C SERIES
ELECTRICAL CHARACTERISTICS OF LD1085CDT90 (VI=12V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 14 3V TA = 25C f =10Hz to 10KHz 54 5.5 0.5 Test Conditions TJ = 25C VI = 11 to 20V VI = 11 to 20V TJ = 25C IO = 0 to 3A VI = 11 to 30V (note 1) Min. 8.82 8.73 Typ. 9 9 1 2 8 12 1.3 5 6.5 0.7 0.008 70 0.003 0.5 0.5 0.04 Max. 9.18 9.27 20 20 30 60 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1085CDT120 (VI=15V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd Iq Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Termal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 0 mA IO = 0 mA IO = 0 mA IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25 F, IO = 3A VI = 17 3V TA = 25C f =10Hz to 10KHz 54 3.2 0.2 Test Conditions TJ = 25C VI = 13.8 to 25V VI = 13.8 to 25V TJ = 25C IO = 0 to 3A VI = 13.8 to 30V (note 1) Min. 11.76 11.64 Typ. 12 12 1 2 12 24 1.3 5 4.5 0.5 0.008 66 0.003 0.5 0.5 0.04 Max. 12.24 12.36 25 25 36 72 1.5 10 Unit V V mV mV mV V V mA A A %/W dB % % %
IO = 0 to 3A TJ = 25C
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
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LD1085C SERIES
ELECTRICAL CHARACTERISTICS OF LD1085CDT (VI=4.25V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified.)
Symbol VO VO VO Vd IO(min) Isc Parameter Output Voltage Line Regulation Load Regulation Dropout Voltage Minimum Load Current Short Circuit Current Termal Regulation SVR IADJ IADJ eN S S Supply Voltage Rejection Adjust Pin Current Adjust Pin Current Change RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability IO = 10mA IO = 10mA IO = 10mA IO = 0 to 5A IO = 5A VI = 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, IO = 5A VI = 4.25V CO = 25 F, CADJ = 25 F, VI = 6.25 3V IO = 10 mA 60 3.2 0.2 Test Conditions TJ = 25C VI = 2.85 to 16.5V TJ = 25C VI = 2.85 to 16.5V IO = 10mA to 5AVI = 2.85 to 30V (note 1) Min. 1.225 1.213 Typ. 1.25 1.25 0.015 0.035 0.1 0.2 1.3 3 4.5 0.5 0.003 75 55 0.2 0.003 0.5 0.5 120 5 0.015 Max. 1.275 1.288 0.2 0.2 0.3 0.4 1.5 10 Unit V V % % % % V mA A A %/W dB A A % % %
IO = 10mA to 5ATJ = 25C
IO = 10mA to 5A VI = 2.75 to 16.5V (note 1) TA = 25C f =10Hz to 10KHz
TA = 125C
1000Hrs
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
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LD1085C SERIES
TYPICAL CHARACTERISTICS (unless otherwise specified Tj = 25C, CI=CO=10F) 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
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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
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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 = 1F(tant), CO=10F(tant), CADJ = 1F
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LD1085C SERIES
Figure 19 : Line Transient Figure 21 : Load Transient
VI=12 to 13V, IO=200mA, CI = 1F(tant), CO=10F(tant), CADJ =1F
VI=12 V, IO=0.12 to 3 A, CI = 1F(tant), CO=10F(tant) CADJ =1F
Figure 20 : Load Transient
VI=12 V, IO=0.12 to 3 A, CI = 1F(tant), CO=10F(tant) CADJ =1F
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LD1085C SERIES
DPAK MECHANICAL DATA
mm. DIM. MIN. A A1 A2 B B2 C C2 D E G H L2 L4 0.6 2.2 0.9 0.03 0.64 5.2 0.45 0.48 6 6.4 4.4 9.35 0.8 1 0.023 TYP MAX. 2.4 1.1 0.23 0.9 5.4 0.6 0.6 6.2 6.6 4.6 10.1 MIN. 0.086 0.035 0.001 0.025 0.204 0.017 0.019 0.236 0.252 0.173 0.368 0.031 0.039 TYP. MAX. 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 0.260 0.181 0.397 inch
0068772-B
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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. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com
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