KFXX Very low drop voltage regulators with inhibit Datasheet - production data Description The KF series are very low drop regulators available in SO-8 and DPAK packages and in a wide range of output voltages. The very low dropout voltage (0.4 V) and the very low quiescent current make them particularly suitable for low noise, low power applications and especially in battery powered systems. SO-8 DPAK A shutdown logic control function is available (pin 5, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. It requires only a 2.2 µF capacitor for stability allowing space and cost Features saving.  Very low dropout voltage (0.4 V)  Very low quiescent current (typ. 50 µA in OFF mode, 500 µA in ON mode)  Output current up to 500 mA  Logic-controlled electronic shutdown  Output voltages of 2.5; 3.3; 5; 8 V  Internal current and thermal limit  Only 2.2 µF for stability  Available in ± 2 % accuracy at 25 °C  Supply voltage rejection: 70 db (typ.)  Temperature range: - 40 to 125 °C Table 1. Device summary Order codes Output voltages SO-8 (tape and reel) DPAK (tape and reel) KF25BD-TR KF25BDT-TR 2.5 V KF33BD-TR KF33BDT-TR 3.3 V KF50BD-TR KF50BDT-TR 5 V KF80BDT-TR 8 V February 2018 DocID4337 Rev 14 1/21 This is information on a product in full production. www.st.com

Contents KFXX Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 DocID4337 Rev 14

KFXX Diagram 1 Diagram Figure 1. Schematic diagram DocID4337 Rev 14 3/21 21

Pin configuration KFXX 2 Pin configuration Figure 2. Pin connections (top view) SO-8 DPAK 4/21 DocID4337 Rev 14

KFXX Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit V DC input voltage - 0.5 to 20 V I I Output current Internally Limited O P Power dissipation Internally Limited TOT T Storage temperature range - 40 to 150 °C STG T Operating junction temperature range - 40 to 125 °C OP 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 DPAK SO-8 Unit R Thermal resistance junction-case 8 20 °C/W thJC R Thermal resistance junction-ambient 100 55 °C/W thJA Figure 3. Test circuit DocID4337 Rev 14 5/21 21

Electrical characteristics KFXX 4 Electrical characteristics Refer to the test circuits, T = 25 °C, C = 0.1 µF, C = 2.2 µF unless otherwise specified. J I O Table 4. Electrical characteristics (V = 2.5 V) O Symbol Parameter Test conditions Min. Typ. Max. Unit I = 50 mA, V = 4.5 V 2.45 2.5 2.55 O I V Output voltage V O I = 50 mA, V= 4.5 V, T = -25 to 85°C 2.4 2.6 O I a V Operating input voltage I = 500 mA 20 V I O I Output current limit 1 A O V Line regulation V= 3.5 to 20 V, I = 5 mA 2 12 mV O I O V Load regulation V= 3.8 V, I = 5 to 500 mA 2 50 mV O I O V= 3.5 to 20V, I = 0mA 0.5 1 I O ON MODE mA I Quiescent current V= 3.8 to 20V, I =500mA 12 d I O V= 6 V OFF MODE 50 100 µA I f = 120 Hz 82 SVR Supply voltage rejection I = 5 mA, V= 4.5 ± 1 V f = 1 kHz 77 dB O I f = 10 kHz 60 eN Output noise voltage B = 10 Hz to 100 KHz 50 µV I = 200 mA 0.2 0.35 O V Dropout voltage V d I = 500 mA 0.4 0.7 O V Control input logic low T = -40 to 125°C 0.8 V IL a V Control input logic high T = -40 to 125°C 2 V IH a I Control input current V= 6 V, V = 6 V 10 µA I I C Output bypass C ESR = 0.1 to 10 , I = 0 to 500 mA 2 10 µF O capacitance O 6/21 DocID4337 Rev 14

KFXX Electrical characteristics Refer to the test circuits, T = 25 °C, C = 0.1 µF, C = 2.2 µF unless otherwise specified. J I O Table 5. Electrical characteristics (V = 3.3 V) O Symbol Parameter Test conditions Min. Typ. Max. Unit I = 50 mA, V = 5.3 V 3.234 3.3 3.366 O I V Output voltage V O I = 50 mA, V= 5.3 V, T = -25 to 85°C 3.168 3.432 O I a V Operating input voltage I = 500 mA 20 V I O I Output current limit 1 A O V Line regulation V= 4.3 to 20 V, I = 5 mA 2 12 mV O I O V Load regulation V= 4.6 V, I = 5 to 500 mA 2 50 mV O I O V= 4.3 to 20V, I = 0mA 0.5 1 I O ON MODE mA I Quiescent current V= 4.6 to 20V, I =500mA 12 d I O V= 6 V OFF MODE 50 100 µA I f = 120 Hz 80 SVR Supply voltage rejection I = 5 mA, V= 5.3 ± 1 V f = 1 kHz 75 dB O I f = 10 kHz 60 eN Output noise voltage B = 10 Hz to 100 KHz 50 µV I = 200 mA 0.2 0.35 O V Dropout voltage V d I = 500 mA 0.4 0.7 O V Control input logic low T = -40 to 125°C 0.8 V IL a V Control input logic high T = -40 to 125°C 2 V IH a I Control input current V= 6 V, V = 6 V 10 µA I I C Output bypass C ESR = 0.1 to 10 , I = 0 to 500 mA 2 10 µF O capacitance O DocID4337 Rev 14 7/21 21

Electrical characteristics KFXX Refer to the test circuits, T = 25 °C, C = 0.1 µF, C = 2.2 µF unless otherwise specified. J I O Table 6. Electrical characteristics (V = 5 V) O Symbol Parameter Test conditions Min. Typ. Max. Unit I = 50 mA, V = 7 V 4.9 5 5.1 O I V Output voltage V O I = 50 mA, V= 7 V, T = -25 to 85°C 4.8 5.2 O I a V Operating input voltage I = 500 mA 20 V I O I Output current limit 1 A O V Line regulation V= 6 to 20 V, I = 5 mA 3 18 mV O I O V Load regulation V= 6.3 V, I = 5 to 500 mA 2 50 mV O I O V= 6 to 20V, I = 0mA 0.5 1 I O ON MODE mA I Quiescent current V= 6.3 to 20V, I =500mA 12 d I O V= 6 V OFF MODE 50 100 µA I f = 120 Hz 76 SVR Supply voltage rejection I = 5 mA, V= 7 ± 1 V f = 1 kHz 71 dB O I f = 10 kHz 60 eN Output noise voltage B = 10 Hz to 100 KHz 50 µV I = 200 mA 0.2 0.35 O V Dropout voltage V d I = 500 mA 0.4 0.7 O V Control input logic low T = -40 to 125°C 0.8 V IL a V Control input logic high T = -40 to 125°C 2 V IH a I Control input current V= 6 V, V = 6 V 10 µA I I C Output bypass C ESR = 0.1 to 10 , I = 0 to 500 mA 2 10 µF O capacitance O 8/21 DocID4337 Rev 14

KFXX Electrical characteristics Refer to the test circuits, T = 25 °C, C = 0.1 µF, C = 2.2 µF unless otherwise specified. J I O Table 7. Electrical characteristics (V = 8 V) O Symbol Parameter Test conditions Min. Typ. Max. Unit I = 50 mA, V = 10 V 7.84 8 8.16 O I V Output voltage V O I = 50 mA, V= 10 V, T = -25 to 85°C 7.68 8.32 O I a V Operating input voltage I = 500 mA 20 V I O I Output current limit 1 A O V Line regulation V= 9 to 20 V, I = 5 mA 4 24 mV O I O V Load regulation V= 9.3 V, I = 5 to 500 mA 2 50 mV O I O V= 9 to 20V, I = 0mA 0.7 1.5 I O ON MODE mA I Quiescent current V= 9.3 to 20V, I =500mA 12 d I O V= 9 V OFF MODE 70 140 µA I f = 120 Hz 72 SVR Supply voltage rejection I = 5 mA, V= 10 ± 1 V f = 1 kHz 67 dB O I f = 10 kHz 60 eN Output noise voltage B = 10 Hz to 100 KHz 50 µV I = 200 mA 0.2 0.35 O V Dropout voltage V d I = 500 mA 0.4 0.7 O V Control input logic low T = -40 to 125°C 0.8 V IL a V Control input logic high T = -40 to 125°C 2 V IH a I Control input current V= 6 V, V = 6 V 10 µA I I C Output bypass C ESR = 0.1 to 10 , I = 0 to 500 mA 2 10 µF O capacitance O DocID4337 Rev 14 9/21 21

Typical performance characteristics KFXX 5 Typical performance characteristics Unless otherwise specified V = 3.3 V. O(NOM) Figure 4. Dropout voltage vs. output current Figure 5. Dropout voltage vs. temperature Figure 6. Supply current vs. input voltage Figure 7. Supply current vs. input voltage (I = 500 mA) (I = 0 mA) OUT OUT Figure 8. Short circuit current vs. input voltage Figure 9. SVR vs. output current (f= 120 Hz) 10/21 DocID4337 Rev 14

KFXX Package mechanical data 6 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. DocID4337 Rev 14 11/21 21

Package mechanical data KFXX Figure 10. DPAK (TO-252) type A drawing 0068772_M_type_A 12/21 DocID4337 Rev 14

KFXX Package mechanical data Table 8. DPAK (TO-252) type A mechanical data mm Dim. Min. Typ. Max. A 2.20 2.40 A1 0.90 1.10 A2 0.03 0.23 b 0.64 0.90 b4 5.20 5.40 c 0.45 0.60 c2 0.48 0.60 D 6.00 6.20 D1 5.10 E 6.40 6.60 E1 4.70 e 2.28 e1 4.40 4.60 H 9.35 10.10 L 1.00 1.50 (L1) 2.80 L2 0.80 L4 0.60 1.00 R 0.20 V2 0° 8° DocID4337 Rev 14 13/21 21

Package mechanical data KFXX Figure 11. DPAK (TO-252) type A footprint (a) Footprint_REV_M_type_A a. All dimensions are in millimeters 14/21 DocID4337 Rev 14

KFXX Package mechanical data Figure 12. SO-8 drawing 0016023_G_FU Table 9. SO-8 mechanical data mm Dim. Min. Typ. Max. A 1.75 A1 0.10 0.25 A2 1.25 b 0.31 0.51 b1 0.28 0.48 c 0.10 0.25 c1 0.10 0.23 D 4.80 4.90 5.00 E 5.80 6.00 6.20 E1 3.80 3.90 4.00 e 1.27 h 0.25 0.50 L 0.40 1.27 L1 1.04 L2 0.25 DocID4337 Rev 14 15/21 21

Package mechanical data KFXX Table 9. SO-8 mechanical data (continued) mm Dim. Min. Typ. Max. k 0° 8° ccc 0.10 Figure 13. SO-8 recommended footprint(b) Footprint_0016023_G_FU b. All dimensions are in millimeters. 16/21 DocID4337 Rev 14

KFXX Packaging mechanical data 7 Packaging mechanical data Figure 14. Tape for DPAK (TO-252) 10 pitches cumulative tolerance on tape +/- 0.2 mm Top cover P0 D P2 T tape E F K0 W B1 B0 For machine ref. only A0 P1 D1 including draft and radii concentric around B0 User direction of feed R Bending radius User direction of feed AM08852v1 DocID4337 Rev 14 17/21 21

Packaging mechanical data KFXX Figure 15. Reel for DPAK (TO-252) T REEL DIMENSIONS 40mm min. Access hole At slot location B D C N A Full radius Tape slot G measured at hub in core for tape start 25 mm min. width AM08851v2 Table 10. DPAK (TO-252) tape and reel mechanical data Tape Reel mm mm Dim. Dim. Min. Max. Min. Max. A0 6.8 7 A 330 B0 10.4 10.6 B 1.5 B1 12.1 C 12.8 13.2 D 1.5 1.6 D 20.2 D1 1.5 G 16.4 18.4 E 1.65 1.85 N 50 F 7.4 7.6 T 22.4 K0 2.55 2.75 P0 3.9 4.1 Base qty. 2500 P1 7.9 8.1 Bulk qty. 2500 P2 1.9 2.1 R 40 T 0.25 0.35 W 15.7 16.3 18/21 DocID4337 Rev 14

KFXX Packaging mechanical data Figure 16. SO-8 tape and reel dimensions Table 11. SO-8 tape and reel mechanical data mm Dim. Min. Typ. Max. A 330 C 12.8 13.2 D 20.2 N 60 T 22.4 Ao 8.1 8.5 Bo 5.5 5.9 Ko 2.1 2.3 Po 3.9 4.1 P 7.9 8.1 DocID4337 Rev 14 19/21 21

Revision history KFXX 8 Revision history Table 12. Document revision history Date Revision Changes 06-Jun-2007 9 Order codes updated. 14-Dec-2007 10 Modified: Table 1. 21-Feb-2008 11 Modified: Table 1. Change title description in cover page. Updated: Table 1 on page 1. 23-Oct-2012 12 Added: R value for DPAK and SO-8 Table 3 on page 5. thJA Modified: titles Figure 6 and Figure 7 on page 10. The part numbers KF25B, KF33B, KF50B, KF80B changed to KF. Updated Section 6: Package mechanical data and Section 7: 19-Mar-2014 13 Packaging mechanical data. Minor text changes. 16-Feb-2018 14 Minor text changes. 20/21 DocID4337 Rev 14

KFXX IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2018 STMicroelectronics – All rights reserved DocID4337 Rev 14 21/21 21

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: S TMicroelectronics: KF25BD-TR KF50BD-TR KF33BD-TR KF25BDT-TR KF80BDT-TR KF33BDT-TR KF50BDT-TR