KFXX
Very low drop voltage regulators with inhibit
SO-8 DPAK
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
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.
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 (tape and reel)
KF25BD-TR
KF33BD-TR
KF50BD-TR
Table 1. Device summary
Order codes
DPAK (tape and reel)
KF25BDT-TR
KF33BDT-TR
KF50BDT-TR
KF80BDT-TR
Output voltages
2.5 V
3.3 V
5 V
8 V
February 2018
This is information on a product in full production.
DocID4337 Rev 14 1/21 www.st.com
7
8
5
6
3
4
1
2
Contents
Contents
KFXX
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 DocID4337 Rev 14
KFXX
1 Diagram
Figure 1. Schematic diagram
Diagram
DocID4337 Rev 14 3/21
21
Pin configuration
2 Pin configuration
Figure 2. Pin connections (top view)
SO-8
DPAK
KFXX
4/21 DocID4337 Rev 14
KFXX Maximum ratings
Symbol
V
I
I
O
P
TOT
T
STG
T
OP
Table 2. Absolute maximum ratings
Parameter
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.
Symbol
R thJC
R thJA
Parameter
Table 3. Thermal data
DPAK
Thermal resistance junction-case
Thermal resistance junction-ambient
8
100
SO-8
20
55
Unit
°C/W
°C/W
Figure 3. Test circuit
DocID4337 Rev 14 5/21
21
Electrical characteristics KFXX
Symbol
V
O
V
I
I
O
V
O
V
O
I d
SVR Supply voltage rejection eN
V d
V
IL
V
IH
I
I
C
O
Refer to the test circuits, T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 2.2 µF unless otherwise specified.
Parameter
Table 4. Electrical characteristics (V
O
= 2.5 V)
Test conditions Min.
Output voltage
Operating input voltage
Output current limit
Line regulation
Load regulation
Quiescent current
Output noise voltage
Dropout voltage
Control input logic low
Control input logic high
Control input current
Output bypass capacitance
I
O
= 50 mA, V
I
= 4.5 V
I
O
= 50 mA, V
I
= 4.5 V, T a
= -25 to 85°C
I
O
= 500 mA
V
I
= 3.5 to 20 V, I
O
= 5 mA
V
I
= 3.8 V, I
O
= 5 to 500 mA
V
I
= 3.5 to 20V, I
O
= 0mA
ON MODE
V
I
= 3.8 to 20V, I
O
=500mA
V
I
= 6 V OFF MODE f = 120 Hz
I
O
= 5 mA, V
I
= 4.5 ± 1 V f = 1 kHz f = 10 kHz
B = 10 Hz to 100 KHz
I
O
= 200 mA
I
O
= 500 mA
T a
= -40 to 125°C
T a
= -40 to 125°C
V
I
= 6 V, V
C
= 6 V
ESR = 0.1 to 10
, I
O
= 0 to 500 mA
2.45
2.4
2
2
1
2
2
0.5
50
82
77
60
50
0.2
0.4
Typ.
Max.
Unit
2.5
2.55
2.6
20
V
12
50
1
12
100
V
A mV mV mA
µA
0.35
0.7
0.8
dB
µV
V
10
V
V
µA
10 µF
6/21 DocID4337 Rev 14
KFXX Electrical characteristics
Refer to the test circuits, T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 2.2 µF unless otherwise specified.
Symbol
V
O
V
I
I
O
V
O
V
O
I d
Parameter
Table 5. Electrical characteristics (V
O
= 3.3 V)
Test conditions Min.
Output voltage
I
O
= 50 mA, V
I
= 5.3 V 3.234
I
O
= 50 mA, V
I
= 5.3 V, T a
= -25 to 85°C 3.168
I
O
= 500 mA Operating input voltage
Output current limit
Line regulation
Load regulation
Quiescent current
SVR Supply voltage rejection eN
V d
V
IL
V
IH
I
I
C
O
Output noise voltage
Dropout voltage
Control input logic low
Control input logic high
Control input current
Output bypass capacitance
V
I
= 4.3 to 20 V, I
O
= 5 mA
V
I
= 4.6 V, I
O
= 5 to 500 mA
V
I
= 4.3 to 20V, I
O
= 0mA
ON MODE
V
I
= 4.6 to 20V, I
O
=500mA
V
I
= 6 V OFF MODE f = 120 Hz
I
O
= 5 mA, V
I
= 5.3 ± 1 V f = 1 kHz f = 10 kHz
B = 10 Hz to 100 KHz
I
O
= 200 mA
I
O
= 500 mA
T a
= -40 to 125°C
T a
= -40 to 125°C
V
I
= 6 V, V
C
= 6 V
ESR = 0.1 to 10
, I
O
= 0 to 500 mA
2
2
1
2
2
0.5
60
50
0.2
0.4
50
80
75
Typ.
Max.
Unit
3.3
3.366
3.432
20
V
12
50
1
12
100
V
A mV mV mA
µA
0.35
0.7
0.8
dB
µV
V
10
V
V
µA
10 µF
DocID4337 Rev 14 7/21
21
Electrical characteristics KFXX
Symbol
V
O
V
I
I
O
V
O
V
O
I d
SVR Supply voltage rejection eN
V d
V
IL
V
IH
I
I
C
O
Refer to the test circuits, T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 2.2 µF unless otherwise specified.
Parameter
Table 6. Electrical characteristics (V
O
= 5 V)
Test conditions Min.
Output voltage
Operating input voltage
Output current limit
Line regulation
Load regulation
Quiescent current
Output noise voltage
Dropout voltage
Control input logic low
Control input logic high
Control input current
Output bypass capacitance
I
O
= 50 mA, V
I
= 7 V
I
O
= 50 mA, V
I
= 7 V, T a
= -25 to 85°C
I
O
= 500 mA
V
I
= 6 to 20 V, I
O
= 5 mA
V
I
= 6.3 V, I
O
= 5 to 500 mA
V
I
= 6 to 20V, I
O
= 0mA
ON MODE
V
I
= 6.3 to 20V, I
O
=500mA
V
I
= 6 V OFF MODE f = 120 Hz
I
O
= 5 mA, V
I
= 7 ± 1 V f = 1 kHz f = 10 kHz
B = 10 Hz to 100 KHz
I
O
= 200 mA
I
O
= 500 mA
T a
= -40 to 125°C
T a
= -40 to 125°C
V
I
= 6 V, V
C
= 6 V
ESR = 0.1 to 10
, I
O
= 0 to 500 mA
4.9
4.8
2
2
1
3
2
0.5
60
50
0.2
0.4
50
76
71
Typ.
Max.
Unit
5 5.1
5.2
20
V
18
50
1
12
100
V
A mV mV mA
µA
0.35
0.7
0.8
dB
µV
V
10
V
V
µA
10 µF
8/21 DocID4337 Rev 14
KFXX Electrical characteristics
Symbol
V
O
V
I
I
O
V
O
V
O
I d
SVR Supply voltage rejection eN
V d
V
IL
V
IH
I
I
C
O
Refer to the test circuits, T
J
= 25 °C, C
I
= 0.1 µF, C
O
= 2.2 µF unless otherwise specified.
Parameter
Table 7. Electrical characteristics (V
O
= 8 V)
Test conditions Min.
Output voltage
Operating input voltage
Output current limit
Line regulation
Load regulation
Quiescent current
Output noise voltage
Dropout voltage
Control input logic low
Control input logic high
Control input current
Output bypass capacitance
I
O
= 50 mA, V
I
= 10 V
I
O
= 50 mA, V
I
= 10 V, T a
= -25 to 85°C
I
O
= 500 mA
V
I
= 9 to 20 V, I
O
= 5 mA
V
I
= 9.3 V, I
O
= 5 to 500 mA
V
I
= 9 to 20V, I
O
= 0mA
ON MODE
V
I
= 9.3 to 20V, I
O
=500mA
V
I
= 9 V OFF MODE f = 120 Hz
I
O
= 5 mA, V
I
= 10 ± 1 V f = 1 kHz f = 10 kHz
B = 10 Hz to 100 KHz
I
O
= 200 mA
I
O
= 500 mA
T a
= -40 to 125°C
T a
= -40 to 125°C
V
I
= 6 V, V
C
= 6 V
ESR = 0.1 to 10
, I
O
= 0 to 500 mA
7.84
7.68
2
2
1
4
2
0.7
60
50
0.2
0.4
70
72
67
Typ.
Max.
Unit
8 8.16
8.32
20
V
24
50
1.5
12
140
V
A mV mV mA
µA
0.35
0.7
0.8
dB
µV
V
10
V
V
µA
10 µF
DocID4337 Rev 14 9/21
21
Typical performance characteristics
5 Typical performance characteristics
KFXX
Unless otherwise specified V
O(NOM)
= 3.3 V.
Figure 4. Dropout voltage vs. output current Figure 5. Dropout voltage vs. temperature
Figure 6. Supply current vs. input voltage
(I
OUT
= 500 mA)
Figure 7. Supply current vs. input voltage
(I
OUT
= 0 mA)
Figure 8. Short circuit current vs. input voltage Figure 9. SVR vs. output current (f= 120 Hz)
10/21 DocID4337 Rev 14
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.
DocID4337 Rev 14 11/21
21
Package mechanical data
Figure 10. DPAK (TO-252) type A drawing
KFXX
12/21 DocID4337 Rev 14
0068772_M_type_A
KFXX
Dim.
E
E1 e e1
H
L b b4 c
A
A1
A2 c2
D
D1
(L1)
L2
L4
R
V2
Package mechanical data
Table 8. DPAK (TO-252) type A mechanical data mm
Typ.
Min.
2.20
0.90
0.03
0.64
5.20
0.45
0.48
6.00
5.10
6.40
4.70
2.28
4.40
9.35
1.00
2.80
0.80
0.60
0.20
0°
6.60
4.60
10.10
1.50
1.00
8°
Max.
2.40
1.10
0.23
0.90
5.40
0.60
0.60
6.20
DocID4337 Rev 14 13/21
21
Package mechanical data
Figure 11. DPAK (TO-252) type A footprint
(a)
KFXX
Footprint_REV_M_type_A
14/21 a.
All dimensions are in millimeters
DocID4337 Rev 14
KFXX
Figure 12. SO-8 drawing
Package mechanical data
Dim.
D
E
E1 e b1 c c1
L1
L2 h
L
A
A1
A2 b
Table 9. SO-8 mechanical data mm
Min.
Typ.
0.10
1.25
0.31
0.28
0.10
0.10
4.80
5.80
3.80
0.25
0.40
4.90
6.00
3.90
1.27
1.04
0.25
DocID4337 Rev 14
Max.
1.75
0.25
0.51
0.48
0.25
0.23
5.00
6.20
4.00
0.50
1.27
0016023_G_FU
15/21
21
Package mechanical data
Dim.
k ccc
Table 9. SO-8 mechanical data (continued) mm
Typ.
Min.
0°
Figure 13. SO-8 recommended footprint
(b)
Max.
8°
0.10
KFXX
Footprint_0016023_G_FU
16/21 b.
All dimensions are in millimeters.
DocID4337 Rev 14
KFXX
7
Packaging mechanical data
Packaging mechanical data
T
Top cover tape
Figure 14. Tape for DPAK (TO-252)
10 pitches cumulative tolerance on tape +/- 0.2 mm
P0
D P2
F
E
W
B1
K0
B0
For machine ref. only including draft and radii concentric around B0
A0
P1
User direction of feed
D1
User direction of feed
R
Bending radius
AM08852v1
DocID4337 Rev 14 17/21
21
Packaging mechanical data
REEL DIMENSIONS
Figure 15. Reel for DPAK (TO-252)
40mm min.
Access hole
At slot location
B
D
C
A
T
N
KFXX
Dim.
P0
P1
P2
R
T
W
D1
E
F
K0
A0
B0
B1
D
Full radius Tape slot in core for tape start 25 mm min.
width
G measured at hub
AM08851v2
1.5
1.5
1.65
7.4
2.55
3.9
7.9
1.9
40
0.25
15.7
Table 10. DPAK (TO-252) tape and reel mechanical data
Tape Reel mm mm
Dim.
Min.
6.8
10.4
Max.
7
10.6
12.1
1.6
G
N
T
C
D
A
B
Min.
1.5
12.8
20.2
16.4
50 1.85
7.6
2.75
4.1
8.1
2.1
0.35
16.3
Base qty.
Bulk qty.
Max.
330
13.2
18.4
22.4
2500
2500
18/21 DocID4337 Rev 14
KFXX Packaging mechanical data
Figure 16. SO-8 tape and reel dimensions
Dim.
T
Ao
Bo
Ko
D
N
A
C
Po
P
12.8
20.2
60
8.1
5.5
2.1
3.9
7.9
Table 11. SO-8 tape and reel mechanical data mm
Min.
Typ.
Max.
330
13.2
22.4
8.5
5.9
2.3
4.1
8.1
DocID4337 Rev 14 19/21
21
Revision history KFXX
Date
06-Jun-2007
14-Dec-2007
21-Feb-2008
23-Oct-2012
19-Mar-2014
16-Feb-2018
Revision
Table 12. Document revision history
Changes
9
10
11
12
13
14
Order codes updated.
Modified: Table 1.
Modified: Table 1.
Change title description in cover page.
Updated: Table 1 on page 1.
Added: R thJA
value for DPAK and SO-8 Table 3 on page 5.
Modified: titles Figure 6 and Figure 7 on page 10.
The part numbers KF25B, KF33B, KF50B, KF80B changed to KF.
Updated Section 6: Package mechanical data and Section 7:
Packaging mechanical data.
Minor text changes.
Minor text changes.
20/21 DocID4337 Rev 14
KFXX
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DocID4337 Rev 14 21/21
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