TPS5140_15 Datasheet, PDF (40/61 Pages) Texas Instruments – FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER

TPS5140
FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER
SLVS305A – DECEMBER 2000 – REVISED JANUARY 2001
APPLICATION INFORMATION
layout guidelines (continued)
D The output voltage sensing trace should be isolated by either ground trace.
D The output voltage sensing trace should not be routed under the inductors on same layer of the PCB.
D The feedback components should be isolated from the output components such as MOSFETs, inductors,
and output capacitors. Otherwise noise from the output components may couple into the feedback signal
lines.
D The resistors for the output voltage set point should be connected to ANAGND.
D INV1/2/3 line should be as short as possible.
From VO
INV
FB
OUT_d
LH1
OUT_u LL1
OUT1_d
ANAGND
SOFTSTART
CT
GND
TPS5140
V_CC and
VCC_SENSE
OUT2_u
LH2
REF
LL2
SCP
OUT3_d
OUT2_d
OUT3_u
VREF5
LL3
LH3
VO1
VIN
VO2
DRVGND
VO3
Figure 52. Output Voltage Diagram
40
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265