ST715XX ST715XX25, ST715XX33 High input voltage - 85 mA LDO linear regulator Features ■ 2.5 V to 24 V input voltage ■ Low dropout voltage (500 mV typ. at 85 mA) ■ Very low quiescent current (3.8 µA typ. at full load) ■ 85 mA guaranteed output current ■ Output voltage: fixed or adjustable ■ Compatible with ceramic output capacitors from 0.47 µF to 10 µF ■ Internal current limit ■ Package DFN8 (3 x 3 mm), SOT23-5L ■ Temperature range: -40 °C to 125 °C SOT23-5L Applications ■ Mobile phones ■ Personal digital assistant (PDAs) ■ Cordless phones and similar battery powered systems DFN8 (3 x 3 mm) The device operates over an input voltage range spanning from 2.5 V to 24 V, and is also stable with output ceramic capacitors. Fault condition protection includes short-circuit current limitation. The ultra low quiescent current of 3.8 µA at full load makes it highly suitable for low power applications and battery powered systems. The wide input voltage range makes the ST715xx an ideal solution for low power industrial applications also. The ST715xx is available in the DFN8 (3 x 3 mm) 8 leads or the SOT23-5. Description The ST715xx is a high voltage, ultra low quiescent low drop linear regulator capable of providing an output current in excess of 85 mA. Table 1. Device summary Order codes Output voltage SOT23-5L ST715MR ST715M15R (1) ST715M18R (1) ST715M25R ST715M28R (1) ST715M33R Marking DFN8 (3 x 3 mm) Marking 71AD ST715PUR 7115 7118 7125 7128 7133 715AD ADJ ST715PU15R (1) 71515 1.5 V ST715PU18R (1) 71518 1.8 V 71525 2.5 V 71528 2.8 V 71533 3.3 V ST715PU25R ST715PU28R (1) ST715PU33R 1. Available on request. June 2010 Doc ID 14414 Rev 7 1/19 www.st.com 19 Contents ST715XX, ST715XX25, ST715XX33 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Output voltage selection for adjustable version . . . . . . . . . . . . . . . . . . 8 5.1 External capacitor requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 Power dissipation and junction temperature . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 1 Diagram Figure 1. Block diagram Diagram Doc ID 14414 Rev 7 3/19 Pin configuration ST715XX, ST715XX25, ST715XX33 2 Pin configuration Figure 2. Pin connections (top view) DFN8 (3x3) SOT23-5L Table 2. Pin description (DFN8 3x3 mm) Symbol Pin for fixed Pin for adjustable IN 1 1 NC 2, 3, 5, 6, 7, Exp. pad GND 4 4 Common ground FB - 5 Feedback pin OUT 8 8 Output voltage Table 3. Name and function Input voltage of the LDO 2, 3, 6, 7, Exp. pad Not internally connected Pin description (SOT23-5L) Symbol Pin for fixed Pin for adjustable IN 4 4 Input voltage of the LDO NC 1, 3 3 Not internally connected GND 2 2 Common ground 1 Feedback pin 5 Output voltage FB OUT 4/19 5 Name and function Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 Maximum ratings 3 Maximum ratings Table 4. Absolute maximum ratings Symbol VIN Parameter Unit from -0.3 to 26 V From -0.3 to VIN+0.3 V 4 V According to package power dissipation A ±2 kV DC input voltage VOUT DC output voltage ADJ Adjust pin IOUT Continuous output current VESD ESD ratings PD Value Power dissipation DFN package 5 Power dissipation SOT23-5 package 1 W TSTG Storage temperature range -65 to 150 °C TOP Operating junction temperature range -40 to 125 °C Note: Absolute maximum ratings are the values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 5. Thermal data Symbol RthJA Parameter Thermal resistance junction-ambient Doc ID 14414 Rev 7 SOT23-5L DFN8 Unit 255 52 °C/W 5/19 Electrical characteristics 4 ST715XX, ST715XX25, ST715XX33 Electrical characteristics TJ = 25 °C, VIN = VOUT(NOM) + 1 V, CIN = 0.1 µF, COUT = 1 µF, IOUT = 1 mA, unless otherwise specified. (1) Table 6. Symbol VIN Electrical characteristics - adjustable version Parameter Test conditions Min. Operating input voltage IOUT = 85mA 2.5 VOUT Output voltage range 1.2 IOUT Output current VIN=VOUT+1 to 24V, IOUT =1mA to 85mA, TJ=-40°C to 125°C ΔVOUT Line regulation VIN=VOUT+1 to 24V, IOUT=1mA, TJ=-40°C to 125°C ΔVOUT Load regulation IOUT =1mA to 85mA, TJ=-40°C to 125°C Output noise voltage (2) 200Hz to 100kHz, IOUT = 50mA, COUT= 10µF, TJ=-40°C to 125°C, VOUT=1.2V SVR Unit 24 V 85 1.2 VFB accuracy (1) eN Max. V VIN=2.5 to 6V, TJ=-40°C to 125°C Feedback voltage VFB Typ. -4.0 VIN=VOUTNOM+1V+/-VRIPPLE, f=1kHz VRIPPLE=0.2V, IOUT = 1mA, Supply voltage rejection C = 10µF OUT TJ=-40°C to 125°C V 4.0 % 0.001 0.004 %/V 0.002 0.004 %/mA 95 µVRMS 45 dB f=100kHz 62 IOUT=0mA to 85mA, TJ=-40°C to 125°C 5.5 IOUT=0mA to 85mA, VIN=24V TJ=-40°C to 125°C 6.5 IQ Quiescent current ISC Short circuit current VOUT=0, TJ=-40°C to 125°C VIN=3.8V TON Turn on time (3) VIN =4.2V, COUT= 10µF, IOUT=60mA, TJ=-40°C to 125°C COUT Output capacitor Capacitance f = 100kHz mA µA 120 mA 0.7 0.47 ms µF 1. For VOUT(NOM) < 2 V, VIN = 2.5 V. 2. Guaranteed by design. 3. Turn-on time is time measured between the input just exceeding 90% of its final value and the output voltage just reaching 95 % of its nominal value. 6/19 Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 Electrical characteristics TJ = 25 °C, VIN = VOUT(NOM) + 1 V, CIN = 0.1 µF, COUT = 1 µF, IOUT = 1 mA, VOUT = 3.3 V unless otherwise specified. (1) Table 7. Symbol VIN Electrical characteristics - fixed version Parameter Test conditions Min. Operating input voltage IOUT = 85mA, TJ=-40°C to 125°C Typ. VOUT +VDRO Max. Unit 24 V PTYP IOUT Output current VIN=4.3 to 24V, TJ=-40°C to 125°C 0 85 mA VOUT VOUT total accuracy (1) VIN=VOUT+1 to 24V, IOUT=0 to 85mA, TJ=-40°C to 125°C -5 +5 % ΔVOUT Line regulation VIN=4.3 to 24V, IOUT=1mA, TJ=-40°C to 125°C 0.001 0.004 %/V ΔVOUT Load regulation IOUT =100µA to 85mA, TJ=-40°C to 125°C 0.002 0.003 %/mA VDROP Drop output voltage (2) IOUT=85mA, TJ=-40°C to 125°C 500 1000 mV eN Output noise voltage (3) 200Hz to 100kHz, IOUT = 50mA, COUT= 10µF, TJ=-40°C to 125°C 210 µVRMS SVR VIN=VOUTNOM+1V+/-VRIPPLE, f=1kHz VRIPPLE=0.2V, IOUT=1mA, Supply voltage rejection C = 10µF OUT TJ=-40°C to 125°C IOUT=0mA to 85mA, TJ=-40°C to 125°C 38 dB f=100kHz IQ Quiescent current ISC Short circuit current VOUT=0, TJ=-40°C to 125°C VIN=3.8V TON Turn on time (4) VIN =4.2V, COUT= 10µF, IOUT=60mA, TJ=-40°C to 125°C COUT Output capacitor Capacitance f = 100kHz 57 3.75 5.5 4.15 6.5 µA VIN=24V 120 mA 0.7 0.47 ms µF 1. For VOUT(NOM) < 2 V, VIN = 2.5 V. 2. 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 output voltages below 2 V. 3. Guaranteed by design. 4. Turn-on time is time measured between the input just exceeding 90 % of its final value and the output voltage just reaching 95% of its nominal value. Doc ID 14414 Rev 7 7/19 Output voltage selection for adjustable version 5 ST715XX, ST715XX25, ST715XX33 Output voltage selection for adjustable version The ST715xx features an adjustable output voltage using two external resistors connected as a voltage divider to the FB pin as shown in the typical application circuit Figure 4. The output voltage is set using the following equation: Equation 1 VOUT = VFB (1 + R1/R2) where typically VFB = 1.2 V. Choose R2 ≥ 5 kΩ in order to optimize quiescent current, accuracy, and high-frequency power-supply rejection. To simplify resistor selection use the following equation: Equation 2 R1 = R2 x (VOUT/VFB - 1) 5.1 External capacitor requirements A 0.1 µF or larger input bypass capacitor, connected between IN and GND and located close to the device, is recommended to improve transient response and noise rejection of the power supply as a whole. A higher-value input capacitor may be necessary if large, fastrise-time load transients will be present in the application and if the device is located several inches away from the power source. The ST715xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. Any capacitor (including ceramic and tantalum) with a value higher than 0.47 µF will properly stabilize this loop. 5.2 Power dissipation and junction temperature To ensure reliable operation, worst-case junction temperature should not exceed 125 °C. This restriction limits the power dissipation the regulator can handle in any given application. To ensure that the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to PD(max). The maximum power dissipation limit is determined using the following equation: Equation 3 PD(max) = (TJMAX - TA) / RthJA where: TJMAX is the maximum allowable junction temperature. RthJA is the thermal resistance junction-to-ambient for the package. TA is the ambient temperature. 8/19 Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 Output voltage selection for adjustable version The regulator dissipation is calculated using the following equation: Equation 4 PD = (VIN - VOUT) x IOUT Power dissipation resulting from quiescent current is negligible. The ST715xx features internal current limiting. During normal operation, it limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. Take care not to exceed the power dissipation ratings of the package. Doc ID 14414 Rev 7 9/19 Typical application ST715XX, ST715XX25, ST715XX33 6 Typical application Figure 3. Application circuit for fixed version Figure 4. Application circuit for adjustable version 10/19 Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 Typical performance characteristics 7 Typical performance characteristics Figure 5. Output voltage vs. temperature Figure 6. 3.5 3.5 IOUT=1mA 3.45 3 IOUT=85mA 2.5 VOUT [V] 3.4 VOUT [V] Output voltage vs. input voltage 3.35 3.3 2 1.5 1 3.25 0.5 3.2 VIN=VOUT(NOM)+1V 3.15 -50 0 50 100 VIN=VOUT(NOM)+1V 0 0 150 1 Dropout voltage vs. output current Figure 8. 2.4 ESR @ 100 kHz [Ohm] 1000 VDROPOUT [V] 800 600 400 200 0 0 20 40 60 80 2.1 1.8 5 6 Supply voltage rejection vs. frequency COUT stability region CIN=0.1µF, VIN=VEN=2.5 to 24V IOUT=1mA to 0.085A 1.2 0.9 STABILITY REGION 0.6 0.3 0 0.47 100 1 4.7 COUT [µF] (nominal value) 10 Figure 10. Output noise voltage vs. frequency 60 700 55 600 50 500 nV/ Hz] SVR [dB] 4 1.5 IOUT [A] Figure 9. 3 VIN [V] Temp [°C] Figure 7. 2 45 40 400 300 200 35 IOUT=1mA, VRIPPLE=0.2VPP, VOUT=1.2V 30 100 1000 10000 100 IOUT=50mA, VIN=2.5V, VOUT=1.2V 100000 0 1000 10000 100000 Freq [Hz] Freq [Hz] Doc ID 14414 Rev 7 11/19 Typical performance characteristics ST715XX, ST715XX25, ST715XX33 Figure 11. Quiescent current vs. input voltage Figure 12. Load transient 5 Iq [µA] 4 3 2 1 VIN=VINH, IOUT=1mA, VOUT=3.3V 0 0 5 10 15 20 25 VIN [V] CIN=COUT=1µF, VEN =VIN=24V IOUT=from 1mA to 85mA tR=tF=5µS Figure 13. Line transient Figure 14. Enable transient COUT=1µF; VIN=VEN=from 4.3 to 22V; IOUT=1mA; tR=tF=5µs CIN= COUT=1µF, VEN=VIN=0 to 4.3V, IOUT=1mA 12/19 Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 8 Package mechanical data 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. Doc ID 14414 Rev 7 13/19 Package mechanical data ST715XX, ST715XX25, ST715XX33 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 14/19 Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 Package mechanical data DFN8 (3x3 mm) mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. 0.80 0.90 1.00 31.5 35.4 39.4 A1 0.02 0.05 0.8 2.0 A3 0.20 A 7.9 b 0.25 0.30 0.35 9.8 11.8 13.8 D 2.85 3.00 3.15 112.2 118.1 124 D2 1.603 1.753 1.853 63.1 69 73 E 2.85 3.00 3.15 112.2 118.1 124 E2 1.345 1.495 1.595 53 58.9 62.8 e L 0.65 0.30 0.40 25.6 0.50 Doc ID 14414 Rev 7 11.8 15.7 19.7 15/19 Package mechanical data ST715XX, ST715XX25, ST715XX33 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 16/19 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 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 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 14414 Rev 7 Max. 17/19 Revision history ST715XX, ST715XX25, ST715XX33 9 Revision history Table 8. Document revision history Date Revision 08-Feb-2008 1 Initial release. 19-Feb-2008 2 Modified: Features on page 1. 22-Sep-2008 3 Modified: DFN8 (3x3 mm) mechanical data on page 15. 26-Nov-2008 4 Modified: Section 5 on page 8. 24-Mar-2010 5 Modified: Table 4 on page 5. 20-May-2010 6 Modified: IQ max values Table 6 on page 6 and Table 7 on page 7. 24-Jun-2010 7 Modified: Table 2 and Table 3 on page 4. 18/19 Changes Doc ID 14414 Rev 7 ST715XX, ST715XX25, ST715XX33 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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