tle6389 Infineon Technologies Corporation, tle6389 Datasheet - Page 16

• Manufacturer Part Number: tle6389
• Description: Step - Down Dc/dc Controller
• Manufacturer: Infineon Technologies Corporation

Target Datasheet Rev. 1.7
4
The TLE6389 family is a family of step-down DC-DC controllers designed primarily for
use in high voltage applications such as automotive. Using an external MOSFET and
current-sense resistor allows design flexibility and the improved efficiencies associated
with high-performance P-channel MOSFETs. A unique, current-limited, pulse-width
(PWM)/pulse-frequency-modulated (PFM) control scheme gives these devices excellent
efficiency over load ranges up to three decades, while drawing less than 100µA under
no load. This wide dynamic range optimizes the TLE6389 for automotive applications,
where load currents can vary considerably as individual circuit blocks are turned on and
off to conserve energy. Operation to a 100% duty cycle allows the lowest possible
dropout voltage, allowing operation during cold cranking. High switching frequencies and
a simple circuit topology minimize PC board area and component costs.
The output voltage is sensed either by an internal voltage divider connected to the FB
pin (TLE6389-50 and TLE6389-33) or an external divider returned to the FB pin
(TLE6389).
400k
100k
Detailed Description
R
R
SI1
SI2
V
IN
=
=




100 F
C
IN1
C
220nF
=
IN2
=
TLE6389G50 Application Circuit
13
7
BDS
VS
SI_GND
SI
R
11
220 nF
0.05
C
SENSE
6
BDS


=
ENABLE
=
ON
TLE6389G50
CS
1
OFF
14
SYNC
M1
16
GDRV
5
12
GND
4
FB
VOUT
RD
2
SO
RO
D1
C
L
RD
1
8
= 47 H
3
9
10
=100nF
M1: Infineon SPD09P06PL
D1: Motorola MBRD360
L1: Coilcraft DO3340P-473
Cin1: TBD
Cout: Low ESR Tantalum
I
C
100 F
OUT
OUT
V
V
=
OUT
OUT
TLE 6389
2001-09-17