LDS3985xx Ultra low drop-low noise BiCMOS 300 mA voltage regulator for use with very low ESR output capacitor Features ■ Input voltage from 2.5 V to 6 V ■ Stable with low ESR ceramic capacitors ■ Ultra low dropout voltage (150 mV typ. at 300 mA load, 0.4 mV typ. at 1 mA load) ■ Very low quiescent current (85 µA typ. at no load, 200 µA typ. at 300 mA load; max 1.5 µA in off mode) ■ Guaranteed output current up to 300 mA ■ Wide range of output voltage: – from 1.25 V to 5.0 V ■ Fast turn-on time: typ. 240 µs – [CO = 2.2 µF, CBYP = 33 nF and IO = 1 mA] ■ Logic-controlled electronic shutdown ■ Internal current and thermal limit ■ Output low noise voltage 30 µVRMS over 10 Hz to 100 kHz ■ SVR of 55 dB at 1 kHz, 50 dB at 10 kHz ■ Temperature range: - 40 °C to 125 °C Description DFN6 SOT23-5L makes it suitable for low power applications and in battery powered systems. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Shutdown logic control function is available, this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. Typical applications are in mobile phone and similar battery powered wireless systems, portable information appliances. The LDS3985xx provides up to 300 mA, from 2.5 V to 6 V input voltage. It is stable with ceramic and high quality tantalum capacitor. The ultra low drop voltage, low quiescent current and low noise Table 1. July 2010 Device summary Part numbers Output voltages LDS3985XX15 1.5 V LDS3985XX18 1.8 V LDS3985XX25 2.5 V LDS3985XX28 2.8 V LDS3985XX30 3.0 V LDS3985XX33 3.3 V LDS3985XX50 5.0 V Doc ID 11039 Rev 7 1/20 www.st.com 20 Contents LDS3985xx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Order codes 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Doc ID 11039 Rev 7 LDS3985xx Diagram 1 Diagram Figure 1. Schematic diagram Doc ID 11039 Rev 7 3/20 Pin configuration LDS3985xx 2 Pin configuration Figure 2. Pin connections (top view for SOT23-5L, top through view for DFN6) SOT23-5L Table 2. DFN6 Pin description Pin n° for SOT23-5L Pin n° for DFN6 Symbol 1 1 VI 2 5 GND Common ground 3 6 VINH Inhibit input voltage: on mode when VINH ≥ 1.2 V, off mode when VINH ≤ 0.4 V (Do not leave floating, not internally pulled down/up) 4 4 BYPASS 5 3 VO - 2 N.C. 4/20 Name and function Input voltage of the LDO Bypass pin: connect an external capacitor (usually 10 nF) to minimize noise voltage Output voltage of the LDO Not connect Doc ID 11039 Rev 7 LDS3985xx Typical application 3 Typical application Figure 3. Typical application circuit Doc ID 11039 Rev 7 5/20 Maximum ratings LDS3985xx 4 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit (1) VI DC input voltage VO DC output voltage -0.3 to VI+0.3 V INHIBIT input voltage -0.3 to VI+0.3 V VINH -0.3 to 6 IO Output current Internally limited PD Power dissipation Internally limited V TSTG Storage temperature range -65 to 150 °C TOP Operating junction temperature range -40 to 125 °C 1. The input pin is able to withstand non repetitive spike of 6.5 V for 200 ms. Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 4. Thermal data Symbol Parameter SOT23-5L DFN6 Unit RthJC Thermal resistance junction-case 81 10 °C/W RthJA Thermal resistance junction-ambient 255 55 °C/W 6/20 Doc ID 11039 Rev 7 LDS3985xx 5 Electrical characteristics Electrical characteristics TJ = 25 °C, VI = VO(NOM) + 0.5 V, CI = 1 µF, CO = 2.2 µF, CBYP = 33 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Table 5. Electrical characteristics for LDS3985xx Symbol Parameter VI Operating input voltage VO Output voltage < 2.5 V VO Output voltage ≥ 2.5 V ΔVO Line regulation (1) Test conditions Min. Typ. Max. Unit 2.5 6 V IO = 1 mA -50 50 TJ = - 40 to 125 °C -75 75 IO = 1 mA -2 2 TJ= - 40 to 125 °C -3 3 VI = VO(NOM) + 0.5 to 6 V, TJ = - 40 to 125 °C -0.1 0.1 VO = 4.7 to 5 V -0.19 mV % of VO(NOM) %/V 0.19 ΔVO Load regulation IO = 1 mA to 300 mA, VO ≤ 2.5 V TJ = - 40 to 125 °C 0.005 0.01 %/mA ΔVO Load regulation IO = 1 mA to 300 mA, VO ≥ 2.5 V TJ = - 40 to 125 °C 0.0008 0.004 %/mA ΔVO Output AC line regulation VI = VO(NOM) + 1 V, IO = 300 mA, tR = tF = 30 µs 5 IO = 0 85 IQ (2) IO = 0, TJ = - 40 to 125 °C Quiescent current ON MODE: VINH = 1.24 V I = 0 to 300 mA O mVPP 150 200 µA IO = 0 to 300 mA, TJ = - 40 to 125 °C 300 0.003 OFF MODE: VINH = 0.4 V TJ = - 40 to 125 °C 1.5 IO = 1 mA 0.4 IO = 1 mA, TJ = -40 to 125 °C VDROP Dropout voltage (3) 2 IO = 150 mA 60 mV IO = 150 mA, TJ = - 40 to 125 °C 100 IO = 300 mA 150 IO = 300 mA, TJ = - 40 to 125 °C ISC SVR IO(PK) Short circuit current RL = 0 Supply voltage rejection VI = VO(NOM)+0.25 V ± VRIPPLE = 0.1 V, IO = 50 mA For VO(NOM) < 2.5 V, VI = 2.55 V Peak output current 250 600 VO ≥ VO(NOM) - 5 % Doc ID 11039 Rev 7 f = 1 kHz 55 f = 10 kHz 50 mA dB 300 550 mA 7/20 Electrical characteristics Table 5. Symbol LDS3985xx Electrical characteristics for LDS3985xx (continued) Parameter Test conditions Min. Typ. Inhibit input logic High Unit 0.4 Inhibit input logic Low VINH Max. VI = 2.5 V to 6 V, TJ= - 40 to 125 °C V 1.4 IINH Inhibit input current VINH = 0.4 V, VI = 6 V ±1 nA eN Output noise voltage BW = 10 Hz to 100 kHz, CO = 2.2 µF 30 µVRMS CBYP = 33 nF 240 µs (5) 160 °C tON TSHDN Turn On time (4) Thermal shutdown Capacitance CO 2.2 22 µF 5 5000 mΩ Output capacitor ESR 1. For VO(NOM) < 2 V, VI = 2.5 V 2. For VO(NOM) = 1.25 V, VI = 2.5 V 3. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply for input voltages below 2.5 V 4. Turn-on time is time measured between the enable input just exceeding VINH high value and the output voltage just reaching 95 % of its nominal value 5. Typical thermal protection hysteresis is 20 °C 8/20 Doc ID 11039 Rev 7 LDS3985xx Typical performance characteristics 6 Typical performance characteristics Figure 4. TJ = 25 °C, VI = VO(NOM) + 0.5 V, CI = 1 µF, CO = 2.2 µF, CBYP = 33 nF, IO = 1 mA, VINH = 1.4 V, unless otherwise specified. Output voltage vs. temp. (VI = 2.5 V) Figure 5. Output voltage vs. temp. (VI = 3.2 V) Figure 6. Output voltage vs. temp. (VI = 3.8 V) Figure 7. Shutdown voltage vs. temperature (VO = 1.35 V) Figure 8. Shutdown voltage vs. temperature (VO = 3.3 V) Line regulation vs. temperature (VI = 2.5 V to 6 V) Figure 9. Doc ID 11039 Rev 7 9/20 Typical performance characteristics LDS3985xx Figure 10. Line regulation vs. temperature (VI = 3.2 V to 6 V) Figure 11. Line regulation vs. temperature (VI = 3.8 V to 6 V) Figure 12. Quiescent current vs. temperature (VI = 2.5 V) Figure 13. Quiescent current vs. temperature (VI = 6 V) Figure 14. Quiescent current vs. temperature (VI = 3.4 V) Figure 15. Supply voltage rejection vs. frequency 10/20 Doc ID 11039 Rev 7 LDS3985xx Typical performance characteristics Figure 16. Dropout voltage vs. temperature Figure 17. Dropout voltage vs. output current Figure 18. Inhibit transient VI = 5 V, IO = 1 mA, VINH = 0 to 1.2 V, CI = CO = 1 µF (cer), CBYP = 10 nF, TR = TF = 1 µs Doc ID 11039 Rev 7 11/20 Package mechanical data 7 LDS3985xx Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 12/20 Doc ID 11039 Rev 7 LDS3985xx Package mechanical data SOT23-5L mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. A 0.90 1.45 35.4 57.1 A1 0.00 0.10 0.0 3.9 A2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 C 0.09 0.20 3.5 7.8 D 2.80 3.00 110.2 118.1 E 1.50 1.75 59.0 68.8 e 0.95 37.4 H 2.60 3.00 102.3 118.1 L 0.10 0.60 3.9 23.6 7049676D Doc ID 11039 Rev 7 13/20 Package mechanical data LDS3985xx DFN6 (3x3 mm) 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 2.90 3.00 3.10 0.114 0.118 0.122 D2 2.23 2.38 2.48 0.088 0.094 0.098 E 2.90 3.00 3.10 0.114 0.118 0.122 E2 1.50 1.65 1.75 0.059 0.065 0.069 e L 0.95 0.30 0.40 0.037 0.50 0.012 0.016 0.020 7946637A 14/20 Doc ID 11039 Rev 7 LDS3985xx Package mechanical data DFN6D (3x3 mm) mechanical data mm. inch. Dim. Min. A 0.80 A1 0 A3 0.02 Max. Min. 1.00 0.031 0.05 0 0.20 b 0.23 D 2.90 D2 2.23 E 2.90 E2 1.50 e L Typ. 3.00 3.00 0.40 Max. 0.039 0.001 0.002 0.008 0.45 0.009 3.10 0.114 2.50 0.088 3.10 0.114 1.75 0.059 0.95 0.30 Typ. 0.018 0.118 0.122 0.098 0.118 0.122 0.069 0.037 0.50 0.012 0.016 0.020 7946637B Doc ID 11039 Rev 7 15/20 Package mechanical data LDS3985xx Tape & reel SOT23-xL mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 16/20 Max. 0.504 0.512 14.4 0.519 0.567 Ao 3.13 3.23 3.33 0.123 0.127 0.131 Bo 3.07 3.17 3.27 0.120 0.124 0.128 Ko 1.27 1.37 1.47 0.050 0.054 0.0.58 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 3.9 4.0 4.1 0.153 0.157 0.161 Doc ID 11039 Rev 7 LDS3985xx Package mechanical data Tape & reel QFNxx/DFNxx (3x3) mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 180 13.2 7.087 C 12.8 D 20.2 0.795 N 60 2.362 T 0.504 0.519 14.4 0.567 Ao 3.3 0.130 Bo 3.3 0.130 Ko 1.1 0.043 Po 4 0.157 P 8 0.315 Doc ID 11039 Rev 7 Max. 17/20 Order codes LDS3985xx 8 Order codes Table 6. Order codes Packages Output voltage SOT23-5L DFN6 LDS3985M125R (1) LDS3985PM12R (1) 1.25 V (1) LDS3985PM13R (1) 1.35 V LDS3985PM15R (1) LDS3985PM18R (1) 1.8 V LDS3985M20R (1) LDS3985PM20R (1) 2.0 V LDS3985M21R (1) LDS3985PM21R (1) 2.1 V LDS3985M22R (1) LDS3985PM22R (1) 2.2 V LDS3985PM25R (1) 2.5 V LDS3985M26R (1) LDS3985PM26R (1) 2.6 V (1) (1) 2.7 V LDS3985M135R LDS3985M15R LDS3985M18R LDS3985M25R LDS3985M27R DFN6D LDS3985PM27R LDS3985M28R LDS3985M285R (1) LDS3985M29R (1) LDS3985PU15R LDS3985PU28R LDS3985PM285R (1) 1.5 V 2.8 V 2.85 V LDS3985PM29R (1) 2.9 V LDS3985PM30R (1) 3.0 V LDS3985PM47R (1) 4.7 V LDS3985M48R (1) LDS3985PM48R (1) 4.8 V (1) LDS3985PM49R (1) 4.9 V LDS3985PM50R (1) 5.0 V LDS3985M30R LDS3985M33R LDS3985M47R LDS3985M49R (1) LDS3985M50R LDS3985PU33R 1. Available on request. 18/20 Doc ID 11039 Rev 7 3.3 V LDS3985xx Revision history 9 Revision history Table 7. Document revision history Date Revision Changes 02-Dec-2004 1 First release. 10-Apr-2007 2 Added: new package TSOT23-5L. 16-May-2007 3 Added: new mechanical data DFN6D and order codes updated. 06-Sep-2007 4 Added: Table 1 in cover page. 11-Jun-2008 5 Modified: Table 6 on page 18. 11-Jul-2009 6 Modified: Table 6 on page 18. 29-Jul-2010 7 Modified: Table 1 on page 1 and Table 6 on page 18. Doc ID 11039 Rev 7 19/20 LDS3985xx 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. 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