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PDF KFXXB Data sheet ( Hoja de datos )
| Número de pieza | KFXXB | |
| Descripción | Very low drop voltage regulators | |
| Fabricantes | STMicroelectronics | |
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KFxxB
Very low drop voltage regulators with inhibit
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 1.5; 2.5; 3.3; 4; 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 KFxx 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.
SO-8
DPAK
Table 1. Device summary
KF15B
KF25B
KF33B
Part numbers
KF40B
KF50B
KF80B
February 2008
Rev 11
1/20
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20
1 page  
KFxxB
3 Maximum ratings
Maximum ratings
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Table 2. Absolute maximum ratings
Symbol
Parameter
VI
IO
PTOT
TSTG
TOP
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
-0.5 to 20
Internally Limited
Internally Limited
-40 to 150
-40 to 125
Unit
V
°C
°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. Thermal data
Symbol
Parameter
RthJC Thermal resistance junction-case
DPAK
8
SO-8
20
Unit
°C/W
Figure 3. Test circuit
5/20
5 Page 
KFxxB
Electrical characteristics
Table 9.
Symbol
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Electrical characteristics for KF80 (refer to the test circuits, TJ = 25 °C, CI = 0.1 µF,
CO = 2.2 µF unless otherwise specified.)
Parameter
Test conditions
Min. Typ. Max. Unit
VO Output voltage
IO = 50 mA, VI = 10 V
7.84 8 8.16
V
IO = 50 mA, VI = 10 V, Ta = -25 to 85°C 7.68
8.32
VI Operating input voltage IO = 500 mA
20 V
IO Output current limit
1A
ΔVO Line regulation
VI = 9 to 20 V, IO = 5 mA
4 24 mV
ΔVO Load regulation
VI = 9.3 V, IO = 5 to 500 mA
2 50 mV
Id Quiescent current
VI = 9 to 20V, IO = 0mA
ON MODE
VI = 9.3 to 20V, IO=500mA
0.7 1.5
mA
12
VI = 9 V
OFF MODE
70 140 µA
f = 120 Hz
72
SVR Supply voltage rejection IO = 5 mA, VI = 10 ± 1 V f = 1 kHz
67 dB
f = 10 kHz
60
eN Output noise voltage
B = 10 Hz to 100 KHz
50 µV
Vd Dropout voltage
VIL Control input logic low
VIH Control input logic high
II Control input current
CO
Output bypass
capacitance
IO = 200 mA
IO = 500 mA
Ta = -40 to 125°C
Ta = -40 to 125°C
VI = 6 V, VC = 6 V
ESR = 0.1 to 10 Ω, IO = 0 to 500 mA
0.2 0.35
0.4 0.7
V
0.8 V
2V
10 µA
2 10
µF
11/20
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| PDF Descargar | [ Datasheet KFXXB.PDF ] | |
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