LD39080 Ultra low drop BICMOS voltage regulator Feature summary ■ 0.8A Guaranteed output current ■ Ultra low dropout voltage (150mV typ. @ 0.8A load, 20mV typ. @150mA load) ■ Very low quiescent current (1mA typ. @ 0.8A load, 1µA max @ 25°C in off mode) DPAK PPAK ■ Logic-controlled electronic shutdown ■ Current and thermal internal limit ■ ±1.5% Output voltage tolerance @ 25°C ■ Fixed and ADJ output voltages: 1.22V, 1.8V, 2.5V, 3.3V, ADJ. (*see order code) ■ Temperature range: -40 to 125°C ■ Fast dynamic response to line and load changes Description ■ Stable with ceramic capacitor (see paragraph 7.1, 7.2, 7.3) ■ Available in PPAK, DPAK and DFN8 (4x4mm) The LD39080 is a fast ultra low drop linear regulator which operates from 2.5V to 6V input supply. Typical application ■ Microprocessor power supply ■ DSPs power supply ■ Post regulators for switching suppliers ■ High efficiency linear regulator DFN8 (4x4 mm) A wide range of output options are available. The low drop voltage, low noise, and ultra low quiescent current make it suitable for low voltage microprocessor and memory applications. The device is developed on a BiCMOS process which allows low quiescent current operation independently of output load current. Order codes Part numbers DPAK (T&R) DFN (1) PPAK (T&R) LD39080DT12-R Output voltage LD39080PU12R 1.22V LD39080DT18-R LD39080PT18-R LD39080PU18R 1.8V LD39080DT25-R LD39080PT25-R LD39080PU25R 2.5V LD39080DT33-R LD39080PT33-R LD39080PU33R 3.3V LD39080PT-R LD39080PU-R ADJ From 1.22 to 5.0V 1. Available on request January 2007 Rev. 1 1/20 www.st.com 20 LD39080 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.4 Thermal note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 LD39080 Diagram 1 Diagram Figure 1. Block diagram (*) Not present on ADJ Versions 3/20 Pin configuration LD39080 2 Pin configuration Figure 2. Pin connections (top view for DPAK and PPAK, bottom view for DFN8) Table 1. DPAK PPAK DFN8 (4x4 mm) Pin description Pln N° DFN 8 Symbol Note VSENSE/N.C. For fixed versions: to be connected with LDO Output Voltage pins for DFN package and Not Connected on PPAK PPAK DPAK 5 ADJ For adjustable version: Error Amplifier Input pin for VO from 1.22 to 5.0V 3, 4 2 1 VI LDO Input Voltage; VI from 2.5V to 6V, CI=1µF must be located at a distance of not more than 0.5’’ from input pin. 6, 7 4 3 VO LDO Output Voltage pins, with minimum CO=2.2µF needed for stability (also refer to CO vs. ESR stability chart) 2 1 1 3 5 4/20 2 VINH Inhibit Input Voltage: ON MODE when VINH ≥ 2V, OFF MODE when VINH ≤ 0.3V (Do not leave floating, not internally pulled down/up) GND Common ground N.C. Not Connected LD39080 3 Typical application circuits Typical application circuits (CI and CO Capacitors must be placed as close as possible to the IC pins) Figure 3. 1 Figure 4. LD39080 fixed version with inhibit Inhibit Pin is not internally pulled down/up then it must not be left floating. Disable the device when connected to GND or to a positive voltage less than 0.3V LD39080 adjustable version VO = VREF (1 + R1/R2) 2 Set R2 as close as possible to 4.7KΩ. 5/20 Typical application circuits Figure 5. LD39080 DPAK Figure 6. Timing diagram 6/20 LD39080 LD39080 Maximum ratings 4 Maximum ratings Table 2. Absolute maximum ratings Symbol VI VINH VO VADJ Parameter Value Unit -0.3 to 6.5 V INHIBIT Input voltage -0.3 to VI +0.3 (6.5V Max) V DC Output voltage -0.3 to VI +0.3 (6.5V Max) V ADJ Pin voltage -0.3 to VI +0.3 (6.5V Max) V DC Input voltage IO Output current Internally Limited mA PD Power dissipation Internally Limited mW TSTG Storage temperature range -50 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 conditions is not implied. All values are referred to GND. Table 3. Thermal Data Symbol Parameter RthJA Thermal resistance junction-ambient RthJC Thermal resistance junction-case PPAK DPAK DFN (1) Unit 100 100 40 °C/W 8 8 10 °C/W 1. With PCB ground plane heatsink. 7/20 Electrical characteristics LD39080 5 Electrical characteristics Table 4. Electrical characteristics (TJ = 25°C, VI = VO+1V, CI = 1µF, CO = 2.2µF, ILOAD = 10mA, VINH = 2V, unless otherwise specified) Symbol VI Parameter Parameter Operating input voltage VI = VO+1V, ILOAD = 10mA to 0.8A VO Output voltage tolerance VREF Reference voltage ∆VO Output voltage LINE regulation Output voltage LOAD ∆VO/∆ILOAD regulation VDROP IQ Dropout voltage (VI - VO) VI = VO+1V to 6V, ILOAD = 10mA to 0.8A TJ = -40 to 125°C Min. Typ. Max. Unit 2.5 6 V -1.5 1.5 -3 3 % of VO(NOM) 1.22 V VI = VO+1V to 6V 0.04 % VI = VO+1V to 6V, TJ = -40 to 125°C 0.1 ILOAD = 10mA to 0.8A 0.06 ILOAD = 10mA to 0.8A, TJ = -40 to 125°C 0.2 0.4 ILOAD = 150mA, TJ=-40 to 125°C 20 40 ILOAD = 0.8A, TJ = -40 to 125°C 150 300 1 2.5 0.2 % %/A mV Quiescent current: ON MODE ILOAD = 10mA to 0.8A, VINH = 2V TJ = -40 to 125°C Quiescent current: OFF MODE VINH = 0.3V 1 VINH = 0.3V, TJ = -40 to 125°C 5 mA µA Short Circuit Protection Short circuit protection RL = 0 Inhibit threshold LOW Inhibit threshold HIGH VI = 2.5 to 6V OFF TJ = -40 to 125°C TD-OFF Current limit ILOAD = 0.8A, VO = 3.3V 15 TD-ON Current limit ILOAD = 0.8A, VO = 3.3V 15 Inhibit input current (1) VI = 6V, VINH = 0 to 6V ±0.1 ISC 1.6 A Inhibit Input VINH IINH 0.3 V 2 µs ±1 µA AC Parameters SVR eN TSHDN Supply voltage rejection Output noise voltage f = 120Hz 65 f = 1kHz 55 dB BW = 10Hz to 100kHz, CO = 2.2µF, VO = 2.5V 100 Thermal shutdown OFF 170 Hysteresis 10 µVRMS °C 1. Guaranteed by design 8/20 VI = 4.5 ± 1V, VO = 3.3V, ILOAD = 10mA, LD39080 Typical performance characteristics 6 Typical performance characteristics Figure 7. (TJ = 25°C, VI = VO+1V, CI = 1µF, CO = 2.2µF, ILOAD = 10mA, VINH = VI, unless otherwise specified) Output voltage vs temperature Figure 8. Dropout voltage vs temperature Figure 9. Dropout voltage vs output current Figure 11. Quiescent current vs supply voltage Figure 10. Quiescent current vs output current Figure 12. Quiescent current vs temperature 9/20 Typical performance characteristics LD39080 Figure 13. Quiescent current vs temperature Figure 14. Short circuit current vs temperature Figure 15. Output voltage vs input voltage Figure 16. Supply voltage rejection vs temperature Figure 17. Stability region vs CO & ESR (at 100kHz) Figure 18. Stability region vs CO & Low ESR (at 100kHz) 10/20 LD39080 Typical performance characteristics Figure 19. Load transient Figure 20. Line transient VI = 3.5V, IO = 10mA to 0.8A, CI = 1µF, CO = 2.2µF VI = 3.5V to 5.5V, ILOAD = 10mA, CO = 2.2µF 11/20 Application notes 7 Application notes 7.1 External capacitors LD39080 The LD39080 requires external capacitors for regulator stability. These capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see Figure 17. Figure 18.). The input/output capacitors must be located less than 1cm from the relative pins and connected directly to the input/output ground pins using traces which have no other currents flowing through them. Any good quality of Ceramic or Electrolytic capacitors can be used. 7.2 Input capacitor An input capacitor whose minimum value is 1µF is required with the LD39080 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 1cm from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. 7.3 Output capacitor It is possible to use Ceramic or Tantalum capacitors but the output capacitor must meet the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. A minimum capacitance of 2.2µF is a good choice to guarantee the stability of the regulator. Anyway, other CO values can be used according to the (Figure 17. Figure 18.) showing the allowable ESR range as a function of the output capacitance. This curve represents the stability region over the full temperature and IO range. 7.4 Thermal note The output capacitor must maintain its ESR in the stable region over the full operating temperature range to assure stability. Also, capacitors tolerance and variation with temperature must be kept in consideration in order to assure the minimum amount of capacitance at all times. 7.5 Inhibit input operation The inhibit pin can be used to turn OFF the regulator when pulled down, so drastically reducing the current consumption down to less than 1µA. When the inhibit feature is not used, this pin must be tied to VI to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section (VIH VIL). The inhibit pin must not be left floating because it is not internally pulled down/up. 12/20 LD39080 8 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. 13/20 Package mechanical data LD39080 PPAK 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 0.4 0.6 0.015 0.023 B2 5.2 5.4 0.204 0.212 0.023 C 0.45 0.6 0.017 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 6.6 0.252 D1 E 5.1 6.4 0.201 0.260 E1 4.7 0.185 e 1.27 0.050 G 4.9 G1 2.38 2.7 0.093 0.106 H 9.35 10.1 0.368 0.397 L2 0.8 L4 0.6 L5 1 L6 5.25 1 1 2.8 0.193 0.206 0.031 0.023 0.039 0.039 0.039 0.110 0078180-E 14/20 LD39080 Package mechanical data 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 b4 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 6.6 0.252 D1 E 5.1 6.4 E1 0.200 4.7 e 0.260 0.185 2.28 0.090 e1 4.4 4.6 0.173 0.181 H 9.35 10.1 0.368 0.397 L 1 0.039 (L1) 2.8 0.110 L2 0.8 0.031 L4 0.6 1 0.023 0.039 0068772-F 15/20 Package mechanical data LD39080 DFN8 (4x4) MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 0.80 0.90 1.00 0.031 0.035 0.039 A1 0 0.02 0.05 0 0.001 0.002 A3 0.20 0.008 b 0.23 0.30 0.38 0.009 0.012 0.015 D 3.90 4.00 4.10 0.154 0.157 0.161 D2 2.82 3.00 3.23 0.111 0.118 0.127 E 3.90 4.00 4.10 0.154 0.157 0.161 E2 2.05 2.20 2.30 0.081 0.087 0.091 e L 0.80 0.40 0.50 0.031 0.60 0.016 0.020 0.024 7869653B 16/20 LD39080 Package mechanical data 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 22.4 0.519 0.882 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 17/20 Package mechanical data LD39080 Tape & Reel QFNxx/DFNxx (4x4) MECHANICAL DATA mm. inch DIM. MIN. TYP A MIN. TYP. 330 C 12.8 D 20.2 N 99 13.2 MAX. 12.992 0.504 0.519 0.795 101 T 18/20 MAX. 3.898 3.976 14.4 0.567 Ao 4.35 0.171 Bo 4.35 0.171 Ko 1.1 0.043 Po 4 0.157 P 8 0.315 LD39080 Revision history 9 Revision history Table 5. Revision history Date Revision 26-Jan-2007 1 Changes Initial release. 19/20 LD39080 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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