MAX1513 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – TFT-LCD Power-Supply Controllers

19-3047; Rev 0; 10/03
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TFT-LCD Power-Supply Controllers
General Description
The MAX1513/MAX1514 provide complete power-sup-
ply solutions for active-matrix thin-film transistor (TFT)
liquid-crystal displays (LCDs). Both devices include a
high-performance step-up regulator controller, three lin-
ear-regulator controllers, and an adjustable delay block
for startup sequencing. The MAX1513 includes an
additional linear-regulator controller and a high-perfor-
mance buffer amplifier. The MAX1513/MAX1514 can
operate from 2.7V to 5.5V input supplies and provide
overload protection with timer delay latch on all the reg-
ulated outputs.
The step-up regulator controller drives an external N-
channel MOSFET to generate the regulated supply volt-
age for the panel source-driver ICs. Its current-mode
control architecture provides fast transient response to
pulsed loads. The high switching frequency (up to
1.5MHz) allows the use of ultra-small inductors and
ceramic capacitors while achieving efficiencies over 85%
using lossless current sensing. The internal soft-start lim-
its the input surge current during startup.
The gate-on and gate-off linear-regulator controllers of
the MAX1513/MAX1514 provide regulated TFT gate-on
and gate-off supplies. The gate-on supply is activated
after an adjustable delay following the step-up regulator.
The logic linear-regulator controller can be used to cre-
ate a low-voltage logic supply. The gamma linear-regula-
tor controller of the MAX1513 can be used to generate a
gamma-correction reference supply or another general-
purpose supply rail. The MAX1513’s high-performance
buffer amplifier can drive the LCD backplane (VCOM)
or the gamma-correction divider string.
The MAX1513/MAX1514 are available in 4mm ✕ 4mm
20-pin thin QFN packages with a maximum thickness of
0.8mm, suitable for ultra-thin LCD panel design.
Applications
Notebook Computer Displays
LCD Monitors and TVs
Automotive Displays
Features
♦ 2.7V to 5.5V Input Supply Range
♦ Input-Supply Undervoltage Lockout
♦ Current-Mode Step-Up Controller
Fast Transient Response to Pulsed Load
High Efficiency
Lossless Current Sensing
430kHz/750kHz/1.5MHz Switching Frequency
♦ Linear-Regulator Controllers for V_GON, V_GOFF
♦ Linear-Regulator Controller for Logic Supply
♦ High-Performance Buffer Amplifier (MAX1513 Only)
♦ Additional Linear-Regulator Controller
(MAX1513 Only)
♦ Power-Up Sequence and V_GON Delay Control
♦ V_MAIN, V_GON, V_GOFF, V_GAMMA Shutdown Control
♦ Timer-Delay Fault Latch for All Outputs
♦ Thermal-Overload Protection
Ordering Information
PART
MAX1513ETP
MAX1514ETP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 Thin QFN 4mm x 4mm
20 Thin QFN 4mm x 4mm
Minimal Operating Circuit
VIN
VLOGIC
VMAIN
VGAMMA
IN
CS+
CS-
SDFR
GATE
DEL
GND
FB
MAX1513
MAX1514
DRVL
FBL
DRVP
FBP
DRVG
FBG
VMAIN
VGON
Pin Configuration appears at end of data sheet.
SUPB
FBPB
DRVN
FBN
TO VCOM OUTB
REF
VGOFF
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