Datasheet

ManualsBrandsST ManualsIntegrated Circuits (ICs)LDO Voltage Regulator 3.3V 1A DPAK

This is information on a product in full production.

February 2018 DocID4337 Rev 14 1/21

KFXX

Very low drop voltage regulators with inhibit

Datasheet - production data

Features

 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

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.

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

saving.

DPAK

SO-8

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

www.st.com

Summary of content (21 pages)

PAGE 1
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).
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Contents KFXX Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance characteristics . . .
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KFXX 1 Diagram Diagram Figure 1.
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Pin configuration 2 KFXX Pin configuration Figure 2.
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KFXX Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit - 0.5 to 20 V VI DC input voltage IO Output current Internally Limited PTOT Power dissipation Internally Limited TSTG Storage temperature range - 40 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.
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Electrical characteristics 4 KFXX Electrical characteristics Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 4. Electrical characteristics (VO= 2.5 V) Symbol Parameter VO Output voltage VI Operating input voltage IO Output current limit Test conditions Min. Typ. Max. IO = 50 mA, VI = 4.5 V 2.45 2.5 2.55 IO= 50 mA, VI= 4.5 V, Ta = -25 to 85°C 2.4 Unit V 2.6 IO = 500 mA 20 1 V A VO Line regulation VI= 3.
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KFXX Electrical characteristics Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 5. Electrical characteristics (VO= 3.3 V) Symbol Parameter VO Output voltage VI Operating input voltage IO Output current limit Test conditions Min. Typ. Max. IO = 50 mA, VI = 5.3 V 3.234 3.3 3.366 IO= 50 mA, VI= 5.3 V, Ta = -25 to 85°C 3.168 Unit V 3.432 IO = 500 mA 20 1 V A VO Line regulation VI= 4.
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Electrical characteristics KFXX Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 6. Electrical characteristics (VO= 5 V) Symbol Parameter VO Output voltage VI Operating input voltage IO Output current limit Test conditions Min. Typ. Max. IO = 50 mA, VI = 7 V 4.9 5 5.1 IO= 50 mA, VI= 7 V, Ta = -25 to 85°C 4.8 Unit V 5.2 IO = 500 mA 20 1 V A VO Line regulation VI= 6 to 20 V, IO = 5 mA 3 18 mV VO Load regulation VI= 6.
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KFXX Electrical characteristics Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 7. Electrical characteristics (VO= 8 V) Symbol Parameter VO Output voltage VI Operating input voltage IO Output current limit Test conditions Min. Typ. Max. IO = 50 mA, VI = 10 V 7.84 8 8.16 IO= 50 mA, VI= 10 V, Ta = -25 to 85°C 7.68 Unit V 8.
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Typical performance characteristics 5 KFXX Typical performance characteristics Unless otherwise specified VO(NOM) = 3.3 V. Figure 4. Dropout voltage vs. output current Figure 5. Dropout voltage vs. temperature Figure 6. Supply current vs. input voltage (IOUT = 500 mA) Figure 7. Supply current vs. input voltage (IOUT = 0 mA) Figure 8. Short circuit current vs. input voltage Figure 9. SVR vs.
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KFXX 6 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.
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Package mechanical data KFXX Figure 10.
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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 E 5.10 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 V2 0.
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Package mechanical data KFXX Figure 11. DPAK (TO-252) type A footprint (a) Footprint_REV_M_type_A a.
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KFXX Package mechanical data Figure 12. SO-8 drawing 0016023_G_FU Table 9. SO-8 mechanical data mm Dim. Min. Typ. A Max. 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.
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Package mechanical data KFXX Table 9. SO-8 mechanical data (continued) mm Dim. Min. k Typ. 0° Max. 8° ccc 0.10 Figure 13. SO-8 recommended footprint(b) Footprint_0016023_G_FU b. All dimensions are in millimeters.
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KFXX 7 Packaging mechanical data Packaging mechanical data Figure 14. Tape for DPAK (TO-252) 10 pitches cumulative tolerance on tape +/- 0.2 mm T P0 Top cover tape P2 D E F B1 K0 For machine ref.
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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 G measured at hub Tape slot 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. A0 6.8 7 A B0 10.4 10.6 B 1.5 12.1 C 12.8 1.6 D 20.2 G 16.4 50 B1 18/21 Min. Max. 330 13.2 D 1.5 D1 1.5 E 1.65 1.85 N F 7.4 7.6 T K0 2.55 2.
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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. A Max. 330 C 12.8 D 20.2 N 60 13.2 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.
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Revision history 8 KFXX Revision history Table 12. Document revision history Date Revision 06-Jun-2007 9 Order codes updated. 14-Dec-2007 10 Modified: Table 1. 21-Feb-2008 11 Modified: Table 1. 12 Change title description in cover page. Updated: Table 1 on page 1. Added: RthJA value for DPAK and SO-8 Table 3 on page 5. Modified: titles Figure 6 and Figure 7 on page 10. 19-Mar-2014 13 The part numbers KF25B, KF33B, KF50B, KF80B changed to KF.
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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.