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
2/20
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
6/20
KFxxB Electrical characteristics
Table 5. Electrical characteristics for KF25 (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 = 4.5 V 2.45 2.5 2.55
V
Output voltage
O
V
Operating input voltage IO = 500 mA 20 V
I
Output current limit 1 A
I
O
ΔV
ΔV
Line regulation VI = 3.5 to 20 V, IO = 5 mA 2 12 mV
O
Load regulation VI = 3.8 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
V
Dropout voltage
d
Control input logic low Ta = -40 to 125°C 0.8 V
V
IL
Control input logic high Ta = -40 to 125°C 2 V
V
IH
I
Control input current VI = 6 V, VC = 6 V 10 µA
I
Output bypass
C
O
capacitance
O
= 50 mA, VI = 4.5 V, Ta = -25 to 85°C 2.4 2.6
I
O
V
= 3.5 to 20V, IO = 0mA
I
= 3.8 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 = 4.5 ± 1 V
O
f = 10 kHz 60
I
= 200 mA 0.2 0.35
O
= 500 mA 0.4 0.7
I
O
ESR = 0.1 to 10 Ω, I
= 0 to 500 mA 2 10 µF
O
V
mA
dBf = 1 kHz 77
V
7/20
Electrical characteristics KFxxB
Table 6. Electrical characteristics for KF33 (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 = 5.3 V 3.234 3.3 3.366
V
Output voltage
O
V
Operating input voltage IO = 500 mA 20 V
I
Output current limit 1 A
I
O
ΔV
ΔV
Line regulation VI = 4.3 to 20 V, IO = 5 mA 2 12 mV
O
Load regulation VI = 4.6 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
V
Dropout voltage
d
Control input logic low Ta = -40 to 125°C 0.8 V
V
IL
Control input logic high Ta = -40 to 125°C 2 V
V
IH
I
Control input current VI = 6 V, VC = 6 V 10 µA
I
Output bypass
C
O
capacitance
O
= 50 mA, VI = 5.3 V, Ta = -25 to 85°C 3.168 3.432
I
O
V
= 4.3 to 20V, IO = 0mA
I
= 4.6 to 20V, IO=500mA 12
V
I
V
= 6 V OFF MODE 50 100 µA
I
ON MODE
0.5 1
f = 120 Hz 80
= 5 mA, VI = 5.3 ± 1 V
O
f = 10 kHz 60
I
= 200 mA 0.2 0.35
O
= 500 mA 0.4 0.7
I
O
ESR = 0.1 to 10 Ω, I
= 0 to 500 mA 2 10 µF
O
V
mA
dBf = 1 kHz 75
V
8/20
KFxxB Electrical characteristics
Table 7. Electrical characteristics for KF40 (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 = 6 V 3.9244.08
V
Output voltage
O
V
Operating input voltage IO = 500 mA 20 V
I
Output current limit 1 A
I
O
ΔV
ΔV
Line regulation VI = 5 to 20 V, IO = 5 mA 3 18 mV
O
Load regulation VI = 5.3 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
V
Dropout voltage
d
Control input logic low Ta = -40 to 125°C 0.8 V
V
IL
Control input logic high Ta = -40 to 125°C 2 V
V
IH
I
Control input current VI = 6 V, VC = 6 V 10 µA
I
Output bypass
C
O
capacitance
O
= 50 mA, VI = 6 V, Ta = -25 to 85°C 3.84 4.16
I
O
V
= 5 to 20V, IO = 0mA
I
= 5.3 to 20V, IO=500mA 12
V
I
V
= 6 V OFF MODE 50 100 µA
I
ON MODE
0.5 1
f = 120 Hz 78
= 5 mA, VI = 6 ± 1 V
O
f = 10 kHz 60
I
= 200 mA 0.2 0.35
O
= 500 mA 0.4 0.7
I
O
ESR = 0.1 to 10 Ω, I
= 0 to 500 mA 2 10 µF
O
V
mA
dBf = 1 kHz 73
V
9/20
Electrical characteristics KFxxB
Table 8. Electrical characteristics for KF50 (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 = 7 V 4.9 5 5.1
V
Output voltage
O
V
Operating input voltage IO = 500 mA 20 V
I
Output current limit 1 A
I
O
ΔV
ΔV
Line regulation VI = 6 to 20 V, IO = 5 mA 3 18 mV
O
Load regulation VI = 6.3 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
V
Dropout voltage
d
Control input logic low Ta = -40 to 125°C 0.8 V
V
IL
Control input logic high Ta = -40 to 125°C 2 V
V
IH
I
Control input current VI = 6 V, VC = 6 V 10 µA
I
Output bypass
C
O
capacitance
O
= 50 mA, VI = 7 V, Ta = -25 to 85°C 4.8 5.2
I
O
V
= 6 to 20V, IO = 0mA
I
= 6.3 to 20V, IO=500mA 12
V
I
V
= 6 V OFF MODE 50 100 µA
I
ON MODE
0.5 1
f = 120 Hz 76
= 5 mA, VI = 7 ± 1 V
O
f = 10 kHz 60
I
= 200 mA 0.2 0.35
O
= 500 mA 0.4 0.7
I
O
ESR = 0.1 to 10 Ω, I
= 0 to 500 mA 2 10 µF
O
V
mA
dBf = 1 kHz 71
V
10/20
KFxxB Electrical characteristics
Table 9. Electrical characteristics for KF80 (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 = 10 V 7.84 8 8.16
V
Output voltage
O
V
Operating input voltage IO = 500 mA 20 V
I
Output current limit 1 A
I
O
ΔV
ΔV
Line regulation VI = 9 to 20 V, IO = 5 mA 4 24 mV
O
Load regulation VI = 9.3 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
V
Dropout voltage
d
Control input logic low Ta = -40 to 125°C 0.8 V
V
IL
Control input logic high Ta = -40 to 125°C 2 V
V
IH
I
Control input current VI = 6 V, VC = 6 V 10 µA
I
Output bypass
C
O
capacitance
O
= 50 mA, VI = 10 V, Ta = -25 to 85°C 7.68 8.32
I
O
V
= 9 to 20V, IO = 0mA
I
= 9.3 to 20V, IO=500mA 12
V
I
V
= 9 V OFF MODE 70 140 µA
I
ON MODE
0.7 1.5
f = 120 Hz 72
= 5 mA, VI = 10 ± 1 V
O
f = 10 kHz 60
I
= 200 mA 0.2 0.35
O
= 500 mA 0.4 0.7
I
O
ESR = 0.1 to 10 Ω, I
= 0 to 500 mA 2 10 µF
O
V
mA
dBf = 1 kHz 67
V
11/20
Typical performance characteristics KFxxB
5 Typical performance characteristics
(unless otherwise specified V
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
O(NOM)
= 3.3 V)
Figure 8. Short circuit current vs input
12/20
voltage
Figure 9. Supply current vs temperature
KFxxB Package mechanical data
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
13/20
Package mechanical data KFxxB
SO-8 mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
mm. inch.
A1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B0.33 0.51 0.013 0.020
C0.19 0.25 0.007 0.010
D4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H5.80 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 8° (max.)
ddd 0.1 0.04
14/20
0016023/C
KFxxB Package mechanical data
DPAK mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A 2.2 2.4 0.086 0.094
A1 0.9 1.1 0.035 0.043
A2 0.03 0.23 0.001 0.009
B 0.64 0.9 0.025 0.035
b4 5.2 5.4 0.204 0.212
C 0.45 0.6 0.017 0.023
C2 0.48 0.6 0.019 0.023
D 6 6.2 0.236 0.244
D1 5.1 0.200
E 6.4 6.6 0.252 0.260
E1 4.7 0.185
e2.28 0.090
e1 4.4 4.6 0.173 0.181
H 9.35 10.1 0.368 0.397
L 1 0.039
(L1)
L2 0.8 0.031
L4 0.6 1 0.023 0.039
R 0.2 0.008
V2 0° 8°0° 8°
mm. inch.
2.8 0.110
0068772-F
15/20
Package mechanical data KFxxB
Tape & reel SO-8 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 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
P7.98.1 0.311 0.319
16/20
KFxxB Package mechanical data
Tape & reel DPAK-PPAK mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T22.40.882
Ao 6.806.90 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
P7.98.0 8.1 0.311 0.315 0.319
mm. inch.
17/20
Order codes KFxxB
7 Order codes
Table 10. Order codes
Packages
Output voltage
SO-8 (tape and reel) DPAK (tape and reel)
KF15BDT-TR 1.5 V
KF25BD-TR KF25BDT-TR 2.5 V
KF33BD-TR KF33BDT-TR 3.3 V
KF40BDT-TR 4 V
KF50BD-TR KF50BDT-TR 5 V
KF80BDT-TR 8 V
18/20
KFxxB Revision history
8 Revision history
Table 11. Document revision history
Date Revision Changes
06-Jun-2007 9 Order codes updated.
14-Dec-2007 10 Modified: Ta bl e 1 0.
21-Feb-2008 11 Modified: Table 10 on page 18.
19/20
KFxxB
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