TLE 6389-2GV Infineon Technologies, TLE 6389-2GV Datasheet - Page 30

• Manufacturer Part Number: TLE 6389-2GV
• Manufacturer: Infineon Technologies

Specifications of TLE 6389-2GV

• Packages: PG-DSO-14
• Comment: Vin up to 60V; VQ adjustable from 1.25V up to 15V; external MOS
• Vq (max): adjustable
• Iq (max): 2,300.0 mA
• Iq (typ): 130.0 µA
• Output: Buck Converter

Datasheet Rev. 2.1
Figure 4
7.7
The TLE 6389 operates with a duty cycle up to 100%. This feature allows to operate with
the lowest possible drop voltage at low battery voltage as it occurs at cold cranking. The
MOSFET is turned on continuously when the supply voltage approaches the output
voltage level, conventional switching regulators with less than 100% duty cycle would fail
in that case.
The drop- or dropout voltage is defined as the difference between the input and output
voltage levels when the input is low enough to drop the output out of regulation. Dropout
depends on the MOSFET drain-to-source on-resistance, the current-sense resistor and
the inductor series resistance. It is proportional to the load current:
V
V
V
V
IN
VOUT
FB
RO
Reset timing
100% duty-cycle operation and dropout
V
t
rd
drop
=
shutdown
thermal
t
rr
I
LOAD
R
t
rd
DS ON PMOS
voltage
under
30
+
R
t
< t
rd
SENSE
rr
+
R
INDUCTANCE
over
load
t
rd
TLE 6389
V
V
2007-08-13
VOUT, RT
FB,RT
t
t
t