MAX8723ETE+T Maxim Integrated Products, MAX8723ETE+T Datasheet - Page 10

• Manufacturer Part Number: MAX8723ETE+T
• Description: IC REG FOR LCD DISPLAY 16-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8723ETE+T

• Applications: Converter, LCD
• Voltage - Input: 6 ~ 13.2 V
• Number Of Outputs: 1
• Voltage - Output: 3.3V, 2 ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX8723 is a high-efficiency switching regulator
designed primarily for TFT LCD display applications. It
operates from 6V to 13.2V inputs and provides a fixed
3.3V or an adjustable output voltage. It can deliver up
to 2A of load current. Although the MAX8723 is
designed to supply power for logic control circuits used
in TFT LCD monitors and TVs, it can be used to supply
other logic control circuits as well.
The MAX8723 contains a step-down switching-regulator,
which generates a fixed 3.3V or an adjustable output
for the logic supply rail. The step-down switching-regu-
lator features a fixed-frequency current-mode control
architecture, digital soft-start, timer-delayed fault pro-
tection, and thermal-overload protection. An internal
Low-Cost, Internal-Switch, Step-Down
Regulator for LCD Displays
Figure
10
______________________________________________________________________________________
2. Functional Diagram
C
C
VL
REF
Detailed Description
VCC
SHDN
VCC2
GND
FSEL
REF
VL
OSC
EA
REF
REF
S
R
SHDN
CURRENT
MAX8723
SENSING
Q
Q
OUT
VL
LX
150mV
REGULATOR
VL
INL
LINEAR
oscillator offers three pin-selectable frequency options
(500kHz/1MHz/1.5MHz), allowing optimized designs
based on the specific application requirements. In
addition, the MAX8723 provides a 5V linear regulator
output and a 2V reference output. Figure 2 shows the
MAX8723 functional block diagram.
The step-down regulator consists of an internal n-chan-
nel MOSFET with gate driver, an internal inductor DC
resistance-based current-sense network, a cycle-by-
cycle current-limit comparator, and a PWM controller
block. The external power stage consists of an induc-
tor, input and output capacitors, and a freewheeling
device, such as a Schottky diode rectifier or a MOSFET
synchronous rectifier.
PGND
OUT
BST
EXT
I.C.
LX
FB
EP
IN
C
D
C
INL
BST
L
C
IN
IN
C
OUT
OUT