LD1580XX 7 A very low drop positive voltage regulator adjustable Features ■ Output current limit ■ Low dropout voltage: typically 400 mV at 7 A output current ■ Output voltage remote sense pin ■ Fast transient response ■ Thermal shutdown protection with hysteresis ■ Wide operating temperature range -40 °C to 125 °C ■ No supply sequencing problems in dual supply mode ■ Output voltages available: adjustable Description The LD1580 is a very low dropout positive linear voltage regulator particularly suitable in applications requiring output currents up to 7 A. P²PAK power dissipation in case of insufficient heatsinking. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 2 % at the maximum output current and over the full temperature range. The LD1580 typical dropout voltage is 400 mV at 7 A while it decreases at lighter loads. This very low dropout is achieved thanks to a second input voltage pin, named VCONTROL, which is also responsible of the output power stage driving. The LD1580 is provided with an output voltage remote sense pin which reduces dramatically any output voltage variations that could occur due to load changes. The ADJ pin is still available. A small capacitor on this pin helps to improve transient response. The LD1580 also features a built-in output current limit function and a thermal shutdown protection with hysteresis which prevents from excessive Table 1. April 2008 Device summary Part number Order code Packaging LD1580XX LD1580P2T-R tape and reel Rev 5 1/15 www.st.com 15 Contents LD1580XX Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 LD1580XX Diagram 1 Diagram Figure 1. Schematic diagram 3/15 Pin configuration 2 Pin configuration Figure 2. Pin connections (top view) 4/15 LD1580XX LD1580XX Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol VPOWER VCONTROL IOUT PD Parameter Value Unit DC VPOWER voltage from -0.3 to 6 V DC VCONTROL voltage from -0.3 to 13 V Output current Internally limited Power dissipation Internally limited TSTG Storage temperature range -55 to +150 °C TOP Operating junction temperature range -40 to +125 °C Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Thermal data Symbol Parameter RthJC Thermal resistance junction-case RthJA Thermal resistance junction-ambient P²PAK Unit 3 °C/W 62.5 °C/W 5/15 Typical application 4 Typical application Figure 3. Typical application circuits LD1580XX R V O = V REF ⋅ ⎛ 1 + ------2-⎞ ⎝ R 1⎠ 6/15 LD1580XX Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics for LD1580 (TJ= - 40 °C to 125 °C, CP = 330 µF, CC = 10 µF, COUT = 100 µF, unless otherwise specified) Symbol VO Parameter Output voltage Test conditions VCONTROL=2.75 V, VPOWER=2 V TJ=25 °C, IOUT=10 mA Min. Typ. Max. 1.237 1.250 1.263 Unit V VCONTROL=2.7 V to 12 V 1.225 VPOWER=2.05 V to 5.5 V, IOUT=0.01 to 7A 1.250 1.275 ΔVO Line regulation VCONTROL=2.5 V to 12 V VPOWER=1.75 V to 5.5 V, IOUT=10 mA 0.08 0.24 % ΔVO Load regulation VCONTROL=2.75 V, VPOWER=2.1 V IOUT=0.01 to 7 A 0.08 0.4 % VCONTROL=2.75 V, VPOWER=2.05 V IOUT=100 mA 6 10 VCONTROL=2.75 V, VPOWER=2.05 V IOUT=4 A 30 60 VCONTROL=2.75 V, VPOWER=1.75 V IOUT=4 A 33 70 VCONTROL=2.75 V, VPOWER=2.05 V IOUT=7 A 60 120 50 120 IC VCONTROL pin current IADJ Adjust pin current VCONTROL=2.75 V, VPOWER=2.05 V IOUT=10 mA IOUT Output current limit VCONTROL=2.75 V, VPOWER=2.05 V (1) SVR Supply voltage rejection VCONTROL=VPOWER=3.75 V Avg VRIPPLE=1 VP-P, IOUT=4 A, TJ=25 °C VDC Minimum VCONTROL voltage, (VCONTROL-VO) VDP TSHDN Shutdown temperature threshold THYST Thermal shutdown hysteresis 9 A 61.5 81.5 dB 0.95 1.15 VPOWER=2.05 V, IOUT=1 A 0.95 1.15 VPOWER=2.05 V, IOUT=4 A 1 1.2 1.05 1.3 0.05 0.15 VCONTROL=2.75 V, IOUT=4 A 0.2 0.4 VCONTROL=2.75 V, IOUT=7 A 0.4 0.6 VCONTROL=2.75 V, IOUT=1 A µA 8 VPOWER=2.05 V, IOUT=100 mA (2) V VPOWER=2.05 V, IOUT=7 A Minimum VPOWER voltage (VPOWER-VO) mA (2) V 170 °C 5 °C 1. Measured when the VOUT voltage drops below 100 mV with respect to its nominal value. 2. Measured when the VOUT voltage drops below 2 % with respect to its nominal value. 7/15 Typical characteristics LD1580XX 6 Typical characteristics Figure 4. (unless otherwise specified TJ = 25 °C, CP = 330 µF, CC = 10 µF, COUT = 100 µF) Output voltage vs temperature Figure 5. Minimum VCONTROL voltage vs temperature Figure 6. Minimum VPOWER voltage vs output Figure 7. current Output voltage vs temperature Figure 8. VCONTROL pin current vs temp. Minimum VPOWER voltage vs temp. 8/15 Figure 9. LD1580XX Typical characteristics Figure 10. VCONTROL pin current vs output current Figure 11. Output current limit vs temperature Figure 12. Quiescent current vs temperature Figure 13. Supply voltage rejection vs output current Figure 14. Line transient response Figure 15. Line transient response VPOWER=3.3V, VCONTROL=5 to 7V, IOUT=1A VPOWER=VCONTROL=5 to 7V, IOUT=1A 9/15 Typical characteristics LD1580XX Figure 16. Load transient response Figure 17. Load transient response VPOWER=VCONTROL=5V VPOWER=VCONTROL=5V Figure 18. Load transient response VPOWER=VCONTROL=5V 10/15 LD1580XX 7 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 11/15 Package mechanical data LD1580XX P2PAK mechanical data mm. inch. Dim. Min. A Typ. 4.30 Max. Min. 4.80 0.169 Typ. Max. 0.188 A1 2.40 2.80 0.094 0.110 A2 0.03 0.23 0.001 0.009 b 0.80 1.05 0.031 0.041 c 0.45 0.60 0.017 0.023 c2 1.17 1.37 0.046 0.053 D 8.95 9.35 0.352 D2 E 8 10.00 E1 0.368 0.315 10.40 0.393 8.5 0.409 0.334 0.409 e 3.20 3.60 0.126 0.142 e1 6.60 7.00 0.260 0.275 L 13.70 14.50 0.539 0.571 L2 1.25 1.40 0.049 0.055 L3 0.90 1.70 0.035 0.067 L5 1.55 2.40 0.061 R V2 0.40 0° 0.094 0.016 8° 0° 8° 7226255/B 12/15 LD1580XX Package mechanical data Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 180 13.0 7.086 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 10.50 10.6 10.70 0.413 0.417 0.421 Bo 15.70 15.80 15.90 0.618 0.622 0.626 Ko 4.80 4.90 5.00 0.189 0.193 0.197 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 11.9 12.0 12.1 0.468 0.472 0.476 13/15 Revision history LD1580XX 8 Revision history Table 5. Document revision history Date Revision 08-Sep-2005 3 Order codes updated. 09-May-2007 4 Order codes updated. 16-Apr-2008 5 Modified: Table 1 on page 1. 14/15 Changes LD1580XX Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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