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19-3047; Rev 0; 10/03
EVAALVUAAILTAIOBNLEKIT
TFT-LCD Power-Supply Controllers
General Description
Features
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.
♦ 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 VGON, VGOFF
♦ Linear-Regulator Controller for Logic Supply
♦ High-Performance Buffer Amplifier (MAX1513 Only)
The step-up regulator controller drives an external N- ♦ Additional Linear-Regulator Controller
channel MOSFET to generate the regulated supply volt-
(MAX1513 Only)
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
♦ Power-Up Sequence and VGON Delay Control
♦ VMAIN, VGON, VGOFF, VGAMMA Shutdown Control
♦ Timer-Delay Fault Latch for All Outputs
ceramic capacitors while achieving efficiencies over 85%
using lossless current sensing. The internal soft-start lim-
♦ Thermal-Overload Protection
its the input surge current during startup.
The gate-on and gate-off linear-regulator controllers of
Ordering Information
the MAX1513/MAX1514 provide regulated TFT gate-on
PART
and
after
gate-off supplies. The gate-on supply is
an adjustable delay following the step-up
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The logic linear-regulator controller can be used to cre-
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
ate a low-voltage logic supply. The gamma linear-regula-
tor controller of the MAX1513 can be used to generate a
Minimal Operating Circuit
gamma-correction reference supply or another general-
purpose supply rail. The MAX1513’s high-performance
buffer amplifier can drive the LCD backplane (VCOM)
VIN IN CS+
or the gamma-correction divider string.
The MAX1513/MAX1514 are available in 4mm ✕ 4mm
20-pin thin QFN packages with a maximum thickness of
SDFR
CS-
GATE
VMAIN
0.8mm, suitable for ultra-thin LCD panel design.
DEL GND
Applications
Notebook Computer Displays
FB
MAX1513
MAX1514
DRVL
LCD Monitors and TVs
Automotive Displays
VLOGIC
VMAIN
FBL
DRVP
FBP
VGON
DRVG
VGAMMA
FBG
DataShee
Pin Configuration appears at end of data sheet.
SUPB
FBPB
DRVN
FBN
TO VCOM OUTB
REF
VGOFF
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________________________________________________________________ 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.
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TFT-LCD Power-Supply Controllers
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ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN = 3V, VSUPB = 10V, SDFR = IN, CREF = 0.22µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
IN Supply Range
IN Undervoltage-Lockout
Threshold
VIN
VUVLO
350mV typical
hysteresis
VIN rising
VIN falling
IN Quiescent Current
IIN
VFB = VFBP = VFBL = VFBG = 1.5V,
VFBN = 0
REF Output Voltage
MAIN STEP-UP CONTROLLER
Operating Frequency
-2µA < IREF < 100µA, 2.7V < VIN < 5.5V
fOSC
SDFR = IN
SDFR = REF
FB Regulation Voltage
FB Line Regulation
FB Input Bias Current
CS+ Input Current
CS- Input Current
Current-Limit Threshold
Gate-Drive Output
VFB VCS+ - VCS- = 0
VIN = 2.7V to 5.5V
VFB = 1.5V
2.2V < VCS+ < 6V
2.2V < VCS- < 6V
VCS+ - VCS-, 2.2V < VCS+ < 6V
High or low
GATE-ON LINEAR-REGULATOR CONTROLLER (REGDPa)taSheet4U.com
FBP Regulation Voltage
VFBP IDRVP = 0.1mA
FBP Input Bias Current
VFBP = 1.5V
FBP Effective Load-Regulation
Error (Transconductance)
VDRVP = 10V, IDRVP = 0.05mA to 1mA
DRVP Sink Current
IDRVP VFBP = 1.1V, VDRVP = 10V
DEL Turn-On Threshold
VTH(DEL)
GAMMA LINEAR-REGULATOR CONTROLLER (REG G, MAX1513 ONLY)
FBG Regulation Voltage
VFBG IDRVG = 0.5mA
FBG to FB Regulation Voltage
Matching
IDRVG = 0.5mA, VCS+ - VCS- = 0
MIN
2.7
2.5
2.2
1.225
1.275
0.60
1.230
-100
-1
100
1.225
-250
2
1.19
1.235
-1.2
TYP
MAX
5.5
2.9
2.5
1.25
1.275
UNITS
V
V
mA
V
1.725
0.90
1.270
0.2
+100
90
+1
150
5
MHz
V
%/V
nA
µA
µA
mV
Ω
1.275
+250
-2
1.31
V
nA
%
mA
V
1.265
+1.2
V
%
FBG Input Bias Current
FBG Effective Load-Regulation
Error (Transconductance)
DRVG Sink Current
VFBG = 1.5V
VDRVG = 10V, IDRVG = 0.25mA to 5mA
IDRVG VFBG = 1.1V, VDRVG = 10V
-250
10
+250
-2
nA
%
mA
DataShee
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