Datasheet
TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
20
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Resistor (R
g
) is moved from the gate of the top FET and placed in series with LL. This allows for a smaller
Schottky diode (DX) to be used.
OUT_u
Q1
Q2
LL
DX
R
g
Figure 38. High-Current Schottky Diode Removed
application for general power
The design shown in this data sheet is a reference design for a general power supply application. An evaluation
module (EVM), TPS5103EVM-136 (SLVP136), is available for customer testing and evaluation. The intent is
to allow a customer to fully evaluate the given design using the plug-in EVM supply shown here. For subsequent
customer board revisions, the EVM design can be copied onto the users PCB to shorten design cycle time,
component count, and board cost.
To help the customers design the power supply using the TPS5103, some key design procedures are shown
in Figure 39.
R13
R7
R6B
R6A
TP10
TP9
TP8
TP7
TP6
TP5
TP4
C9
C8
TP11
TP12
TP13
TP14
R10
JP1 JP2
R9
TP2
TP1
R4
C5
TP3
R3
C7
C6
R5
TP15
TP16
TP17
TP18
C15
Q1
C10
D2
TP26
R11
+
C1
C14
L1
C2
R1
J4
J3
J2
J1
J5
J6
J7
J8
Input GND
Input GND
Input GND
SENSE
J13
C12
Q2
C13
C11
R12
D1
+
C3
J14
J12
J11
J10
J9
NOTE: V
I
= 4. V to 10 V
V
O
= 1.8 V @ 4 A
Figure 39. EVM Schematic
LH
SOFTSTART
INV
FB
C
T
R
T
GND
REF
COMP
PWM/SKIP
STBY
470 µF
OUT_u
LL
OUT_d
OUTGND
TRIP
VCC_SENSE
V
CC
VREF5
VREG5V_IN
V
I
V
I
V
O
V
O
V
O
V
O
GND
V
O
GND
V
O
GND
6.8 µH