MAX8723 Datasheet, PDF (1/1 Pages) Maxim Integrated Products – Low-Cost, Internal-Switch, Step-Down Regulator for LCD Displays

XX-XXXX; Rev 0; 3/06
Low-Cost, Internal-Switch, Step-Down
Regulator for LCD Displays
General Description
The MAX8723 is a high-efficiency, switch-mode, step-
down regulator with a 14V internal power switch. With only
a few external passive components, this low-cost regulator
can generate a fixed 3.3V or adjustable DC output voltage
of 2.0V to 3.6V (dual mode) from a 6V to 13.2V DC source.
The 13.2V input voltage range makes this part ideal for
LCD displays, point-of-load regulators, and other 8/12V-
powered industrial equipment applications.
The MAX8723 can deliver up to 2A. It features an inter-
nal power MOSFET, a built-in bootstrap diode for its
MOSFET driver, and an interface for an external syn-
chronous rectifier MOSFET drive to replace the
Schottky diode and improve efficiency. Its fixed-fre-
quency PWM/skip-mode operation and current-mode
control architecture provide fast load-transient
response without compensation. The switching fre-
quency is a pin-selectable 500kHz, 1MHz, or 1.5MHz,
minimizing the size of external components.
The MAX8723 has built-in soft-start, current-limit, ther-
mal-shutdown, and timer-delayed output-fault shutdown
functions. The soft-start function limits inrush current
during startup, avoiding transients that can trigger the
front-end protection circuits and lock up the system.
The current limit, thermal-shutdown, and timer-delayed
output-fault shutdown functions protect the power sup-
ply against fault conditions.
The MAX8723 also includes a linear regulator (VL) which
provides a fixed 5V output (25mA) to support small exter-
nal loads. The reference output is high-precision (2V
± 1%) and can also supply small external load currents.
The MAX8723 is available in the 16-pin 4mm x 4mm
TQFN package.
Applications
LCD TVs
LCD Monitors
Digital System Power Supplies
Point-of-Load Regulators
8/12V Industrial Equipment
Pin Configuration appears at end of data sheet.
Features
♦ 6V to 13.2V Input Supply Range
♦ Integrated 14V 2A N-Channel MOSFET Switch
♦ Preset 1.5% Accurate 3.3V fixed Output Voltage or
2.0V to 3.6V Adjustable Output (Dual Mode)
♦ Current-Mode PWM Operation
♦ Frequency-Selectable 500kHz/1MHz/1.5MHz
♦ Internal 5V Linear Regulator Supports Up to 25mA
External Load
♦ 2V Precision Reference (1%)
♦ Integrated Bootstrap Diode for High-Side
MOSFET Drive
♦ External Synchronous Rectifier Driver
♦ Built-In Soft-Start
♦ 200µA Standby Mode
♦ Timer-Delayed Output Fault Protection
♦ Thermal Shutdown Protection
♦ Small 16-Pin 4mm x 4mm Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8723ETE+ -40°C to +85°C
16-pin Thin QFN
4mm x 4mm
PKG
CODE
T1644-4
Simplified Operating Circuit
IN
CINL
INL
CREF
CVL
REF
BST
IN
V_CC
SHDN
SKIP
VL
LX
MAX8723
GND
PGND
FSEL
EXT
OUT
I.C.
EP
FB
CBST
CIN
L
D
OUT
COUT
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