Datasheet

Maxim Integrated │ 18
MAX17503 4.5V-60V, 2.5A, High-Efciency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
www.maximintegrated.com
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
thata“+”,“#”,or“-”inthepackagecodeindicatesRoHSstatus
only. Package drawings may show a different suffix character, but
thedrawingpertainstothepackageregardlessofRoHSstatus.
Chip Information
PROCESS:BiCMOS
Note: All devices operate over the -40ºC to +125ºC tempera-
ture range, unless otherwise noted.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information
PART PIN-PACKAGE
MAX17503ATP+ 20 TQFN-EP*
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND PATTERN
NO.
20 TQFN-EP T2044+4 21-0139 90-0409
Typical Application Circuits (continued)
Fsw = 100kHz
MAX17503
RESETB
VOUT
3.3V, 2.5A
EN/UVLOVIN
VIN
BST
RT
VIN
SYNC
MODE
VCC
SGND
CF
SS
FB
PGND PGND PGND
LX
LX
LX
VIN
C12 = 0.8/ (R5 X Fsw)
R7 = R5/100
C6 = 14/Fsw
R8
90.9k
C2
2.2μF
R5
210k
C13
220pF
C3
33000pF
C6
15pF
C4
100μF
C9
100μF
C1
2.2μF
C8
2.2μF
C5
0.1μF
C12
47pF
L1
33μH
R3
97.6k
R4
36.5k
R7
1k
Figure 5 - 3.3V Output, 100kHz Switching Frequency