Datasheet

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This is information on a product in full production.

October 2012 Doc ID 4337 Rev 12 1/17

KF25B, KF33B

KF50B, KF80B

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 KFxxB series are very low drop regulators

available in SO-8 package and in a wide range of

output voltages.

The very low drop voltage (0.4 V) and the very low

quiescent current make them particularly suitable

for low noise, low power applications and

specially 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

Part numbers

Order codes

Output voltages

SO-8 (tape and reel) DPAK (tape and reel)

KF25B KF25BD-TR KF25BDT-TR 2.5 V

KF33B KF33BD-TR KF33BDT-TR 3.3 V

KF50B KF50BD-TR KF50BDT-TR 5 V

KF80B KF80BDT-TR 8 V

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Summary of content (17 pages)

PAGE 1
KF25B, KF33B KF50B, KF80B 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.
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Contents KF25B, KF33B, KF50B, KF80B Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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KF25B, KF33B, KF50B, KF80B 1 Diagram Figure 1.
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Pin configuration KF25B, KF33B, KF50B, KF80B 2 Pin configuration Figure 2.
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KF25B, KF33B, KF50B, KF80B 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.
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Electrical characteristics 4 KF25B, KF33B, KF50B, KF80B Electrical characteristics Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 4. Symbol Electrical characteristics for KF25B 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 ΔVO Line regulation VI = 3.
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KF25B, KF33B, KF50B, KF80B Electrical characteristics Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 5. Symbol Electrical characteristics for KF33B 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 ΔVO Line regulation VI = 4.
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Electrical characteristics KF25B, KF33B, KF50B, KF80B Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 6. Symbol Electrical characteristics for KF50B 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.
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KF25B, KF33B, KF50B, KF80B Electrical characteristics Refer to the test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified. Table 7. Symbol Electrical characteristics for KF80B 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 KF25B, KF33B, KF50B, KF80B 5 Typical performance characteristics Figure 4. Unless otherwise specified VO(NOM) = 3.3 V. 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. Supply current vs.
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KF25B, KF33B, KF50B, KF80B 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 KF25B, KF33B, KF50B, KF80B SO-8 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8° (max.) 0.1 0.
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KF25B, KF33B, KF50B, KF80B Package mechanical data DPAK mechanical data mm. inch. Dim. Min. A A1 A2 B b4 C C2 D D1 E E1 e e1 H L (L1) L2 L4 R V2 Typ. 2.2 0.9 0.03 0.64 5.2 0.45 0.48 6 Max. Min. 2.4 1.1 0.23 0.9 5.4 0.6 0.6 6.2 0.086 0.035 0.001 0.025 0.204 0.017 0.019 0.236 5.1 6.4 6.6 0.252 0.260 0.173 0.368 0.039 2.8 0.8 0.181 0.397 0.110 0.031 1 0.023 0.2 0° 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 0.185 0.090 4.6 10.1 0.6 Max. 0.200 4.7 2.28 4.4 9.35 1 Typ. 0.039 0.
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Package mechanical data KF25B, KF33B, KF50B, KF80B Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 14/17 Typ. 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.
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KF25B, KF33B, KF50B, KF80B 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.
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Revision history 7 KF25B, KF33B, KF50B, KF80B Revision history Table 8. 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.
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KF25B, KF33B, KF50B, KF80B 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.