Datasheet

Maxim Integrated │ 11
MAX17503 4.5V-60V, 2.5A, High-Efciency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
www.maximintegrated.com
Pin Description (continued)
Block Diagram
PIN NAME FUNCTION
12 V
CC
5V LDO Output. Bypass V
CC
with2.2µFceramiccapacitancetoSGND.
13 SGND AnalogGround
14–16 PGND
PowerGround.ConnectthePGNDpinsexternallytothepowergroundplane.ConnecttheSGNDand
PGNDpinstogetheratthegroundreturnpathoftheV
CC
bypasscapacitor.RefertotheMAX17503EV
kit data sheet for a layout example.
17–19 LX
SwitchingNode.ConnectLXpinstotheswitchingsideoftheinductor.RefertotheMAX17503EVkit
data sheet for a layout example.
20 BST Boost Flying Capacitor. Connect a 0.1µF ceramic capacitor between BST and LX.
— EP
Exposedpad.ConnecttotheSGNDpin.ConnecttoalargecopperplanebelowtheICtoimproveheat
dissipationcapability.Addthermalviasbelowtheexposedpad.RefertotheMAX17503EVkitdatasheet
for a layout example.
V
CC
SGND
1.215V
5V
LX
PGND
MODE
V
IN
BST
LDO
EN/UVLO
RT
MAX17503
SYNC
CF
FB
SS
FB
OSCILLATOR
SWITCHOVER
LOGIC
ERROR AMPLIFIER/
LOOP COMPENSATION
MODE
SELECTION
LOGIC
SLOPE
COMPENSATION
RESET
LOGIC
CURRENT-SENSE
LOGIC
HICCUP
HICCUP
5µA
V
CC
PWM/
PFM/
HICCUP
LOGIC
AND
DRIVERS
V
BG
= 0.9V
RESET
EN/UVLO