MAX8753 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – TFT LCD DC-DC Converter with Integrated Charge Pumps

19-3919; Rev 0; 1/06
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TFT LCD DC-DC Converter with
Integrated Charge Pumps
General Description
The MAX8753 quadruple-output DC-DC converter pro-
vides the regulated voltages required by active-matrix,
thin-film transistor (TFT), liquid-crystal displays (LCDs).
It includes a high-power step-up regulator (V_MAIN), two
low-power charge pumps (V_POS and V_NEG), and a low-
voltage 300mA linear regulator (V_LOGIC).
The step-up DC-DC converter is a high-frequency
(1MHz) current-mode regulator with a built-in power
MOSFET that allows the use of ultra-small inductors and
ceramic capacitors. It provides fast transient response
to pulsed loads and includes an automatic pulse-skip-
ping mode that increases efficiency over a wide-load
current range. The 1.5A current limit allows a +10V out-
put at more than 300mA from a +3.3V input.
The two charge pumps independently regulate one
positive and one negative output voltage. The positive
charge pump is a voltage tripler that accepts an input
voltage up to +13V and delivers a 20mA output up to
+28V without external switches or diodes. The negative
charge pump inverts an input voltage up to +24V and
delivers a 20mA negative output using external diodes.
The logic linear regulator converts the IC’s +2.6V-to-
+5.5V input to a regulated +2.5V or adjustable output.
The MAX8753 is available in a 28-pin thin QFN pack-
age with a maximum thickness of 0.8mm for ultra-thin
LCD panel design.
Applications
Notebook Computers, PDAs
Car Navigation Displays
LCD Monitors
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
PGND 22
N.C. 23
DLP 24
SHDN 25
LCDON 26
C1N 27
C1P 28
MAX8753
14 REF
13 GND
12 N.C.
11 IN
10 OUTL
9 FBL
8 FBP
1 234567
Features
o 3 Integrated DC-DC Converters, 1 LDO
o 1MHz Current-Mode PWM Boost Regulator
Up to +13V Main High-Power Output
±1% Accuracy
High Efficiency (90%)
o Dual Charge-Pump Outputs
No External Diodes for Positive Charge Pump
Up to +28V Positive Charge-Pump Output
Negative Charge-Pump Output
o 300mA Logic Linear Regulator
o +2.6V to +5.5V Input Operating Range
o 0.8mA Quiescent Current
o Internal Supply Sequencing and Soft-Start
o Thermal Protection
o Ultra-Thin, 28-Pin TQFN Package (0.8mm max)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8753ETI+
-40°C to 85°C
28 Thin QFN
(5mm x 5mm)
+Denotes lead-free package.
Minimal Operating Circuit
VIN +2.6V TO +5.5V
V_MAIN
IN
VMAIN
SUPN
VLOGIC
SHDN
LCDON
OUTL
FBL
DLP
MAX8753
PGND
GND
FB
C3P
FBN
REF
OUTP
FBP
VNEG
VPOS
TQFN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.