Datasheet

HG
BOOT
I
SEN
LG
PGND
FB
V
CC
SD
PWGD
FREQ/SYNC
SS/TRACK
SGND
EAO
PGND
V
CC
= 5V
V
IN
= 5V
V
OUT
= 2.5V@2A
R
FB2
C
C2
R
C1
R
CS
C
SS
R
CC
C
CC
D
1
C
BOOT
Q1
C
IN
1,2
L1
+
C
C1
R
FB1
C
O
1,2
LM2745
R
C2
C
C3
R
PULL-UP
R
FADJ
C
Clk
Clk
+
LM2745, LM2748
www.ti.com SNOSAL2E –APRIL 2005–REVISED APRIL 2013
PART PART NUMBER TYPE PACKAGE DESCRIPTION VENDOR
U1 LM2745 Synchronous TSSOP-14 TI
Controller
Q1 FDS6898A Dual N-MOSFET SO-8 20V, 10 mΩ @ 4.5V, Fairchild
16nC
D1 MBR0520LTI Schottky Diode SOD-123
L1 DO3316P-472 Inductor 4.7 µH, 4.8Arms 18 Coilcraft
mΩ
C
IN
1 16SP100M Aluminum Electrolytic 10mm x 6mm 100 µF, 16V, 2.89Arms Sanyo
C
O
1 6SP220M Aluminum Electrolytic 10mm x 6mm 220 µF, 6.3V 3.1Arms Sanyo
C
CC
, C
BOOT,
VJ1206Y104KXXA Capacitor 1206 0.1 µF, 10% Vishay
C
IN
2, C
O
2
C
C3
VJ0805Y332KXXA Capacitor 805 3300 pF, 10% Vishay
C
SS
VJ0805A123KXAA Capacitor 805 12 nF, 10% Vishay
C
C2
VJ0805A821KXAA Capacitor 805 820 pF 10% Vishay
C
C1
VJ0805A220KXAA Capacitor 805 22 pF, 10% Vishay
R
FB2
CRCW08051002F Resistor 805 10.0 kΩ 1% Vishay
R
FB1
CRCW08054991F Resistor 805 4.99 kΩ1% Vishay
R
FADJ
CRCW08051003F Resistor 805 100 kΩ 1% Vishay
R
C2
CRCW08052101F Resistor 805 2.1 kΩ 1% Vishay
R
CS
CRCW08052101F Resistor 805 2.1 kΩ 1% Vishay
R
CC
CRCW080510R0F Resistor 805 10.0Ω 1% Vishay
R
C1
CRCW08055492F Resistor 805 54.9 kΩ 1% Vishay
R
PULL-UP
CRCW08051003J Resistor 805 100 kΩ 5% Vishay
C
CLK
VJ0805A560KXAA Capacitor 805 56 pF, 10% Vishay
Figure 34. 5V to 2.5V @ 2A, f
SW
= 300 kHz
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