ST KF15B, KF40B, KF25B, KF50B, KF33B User Manual
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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
KFxxB
SO-8
DPAK
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.
Table 1. Device summary
Part numbers
KF15B KF40B
KF25B KF50B
KF33B KF80B
February 2008 Rev 11 1/20
www.st.com
20
Contents KFxxB
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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KFxxB Diagram
1 Diagram
Figure 1. Schematic diagram
3/20
Pin configuration KFxxB
2 Pin configuration
Figure 2. Pin connections (top view)
SO-8
DPAK
4/20
KFxxB Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
P
T
T
V
I
I
O
TOT
STG
OP
DC input voltage -0.5 to 20 V
Output current Internally Limited
Power dissipation Internally Limited
Storage temperature range -40 to 150 °C
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. Thermal data
Symbol Parameter DPAK SO-8 Unit
R
thJC
Figure 3. Test circuit
Thermal resistance junction-case 8 20 °C/W
5/20
Electrical characteristics KFxxB
4 Electrical characteristics
Table 4. Electrical characteristics for KF15 (refer to the test circuits, TJ = 25 °C, CI = 0.1 µF,
C
= 2.2 µF unless otherwise specified.)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
= 50 mA, VI = 3.5 V 1.47 1.5 1.53
V
Output voltage
O
V
Operating input voltage IO = 500 mA 2.5 20 V
I
Output current limit 1 A
I
O
ΔV
ΔV
Line regulation VI = 2.5 to 20 V, IO = 5 mA 2 12 mV
O
Load regulation VI = 2.8 V, IO = 5 to 500 mA 2 50 mV
O
I
Quiescent current
d
SVR Supply voltage rejection I
eN Output noise voltage B = 10 Hz to 100 kHz 50 µV
Dropout voltage IO = 200 mA 1 V
V
d
V
Control input logic low Ta = -40 to 125°C 0.8 V
IL
Control input logic high Ta = -40 to 125°C 2 V
V
IH
Control input current VI = 6 V, VC = 6 V 10 µA
I
I
Output bypass
C
O
capacitance
O
= 50 mA, VI = 3.5 V, Ta = -25 to 85°C 1.44 1.56
I
O
V
= 2.5 to 20V, IO = 0mA
I
= 2.8 to 20V, IO=500mA 12
V
I
V
= 6 V OFF MODE 50 100 µA
I
ON MODE
0.5 1
f = 120 Hz 82
= 5 mA, VI = 3.5 ± 1 V
O
f = 10 kHz 60
ESR = 0.1 to 10 Ω, I
= 0 to 500 mA 2 10 µF
O
V
mA
dBf = 1 kHz 77
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