KFXX
Very low drop voltage regulators with inhibit
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.
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
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
Order codes
Output voltages
SO-8 (tape and reel)
KF25BD-TR
KF33BD-TR
KF50BD-TR
DPAK (tape and reel)
KF25BDT-TR
KF33BDT-TR
KF50BDT-TR
KF80BDT-TR
2.5 V
3.3 V
5V
8V
February 2018
This is information on a product in full production.
DocID4337 Rev 14
1/21
www.st.com
Contents
KFXX
Contents
1
2
3
4
5
6
7
8
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
Maximum ratings
3
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
V
I
I
O
P
TOT
T
STG
T
OP
DC input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Parameter
Value
- 0.5 to 20
Internally Limited
Internally Limited
- 40 to 150
- 40 to 125
°C
°C
Unit
V
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
R
thJC
R
thJA
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
DPAK
8
100
SO-8
20
55
Unit
°C/W
°C/W
Figure 3. Test circuit
DocID4337 Rev 14
5/21
21