19-4681; Rev 1; 3/10
Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
General Description
Features
S 8.0V to 16.5V IN Supply-Voltage Range
The MAX17126/MAX17126A generate all the supply rails
for thin-film transistor liquid-crystal display (TFT LCD)
TV panels operating from a regulated 12V input. They
include a step-down and a step-up regulator, a positive
and a negative charge pump, an operational amplifier,
a high-accuracy high-voltage gamma reference, and
a high-voltage switch control block. The MAX17126/
MAX17126A can operate from input voltages from 8V
to 16.5V and is optimized for an LCD TV panel running
directly from 12V supplies.
S Selectable Frequency (500kHz/750kHz)
S Current-Mode Step-Up Regulator
Fast Load-Transient Response
High-Accuracy Output Voltage (1.0%)
Built-In 20V, 4.2A, 100mI MOSFET
High Efficiency
Adjustable Soft-Start
Adjustable Current Limit
Low Duty-Cycle Operation (13.2V - 13.5V AVDD)
IN
The step-up and step-down switching regulators feature
internal power MOSFETs and high-frequency opera-
tion allowing the use of small inductors and capacitors,
resulting in a compact solution. The step-up regulator
provides TFT source driver supply voltage, while the
step-down regulator provides the system with logic sup-
ply voltage. Both regulators use fixed-frequency current-
mode control architectures, providing fast load-transient
response and easy compensation. A current-limit func-
tion for internal switches and output-fault shutdown pro-
tects the step-up and step-down power supplies against
fault conditions. The MAX17126/MAX17126A provide
soft-start functions to limit inrush current during startup.
In addition, the MAX17126/MAX17126A integrate a con-
trol block that can drive an external p-channel MOSFET
to sequence power to source drivers.
S Current-Mode Step-Down Regulator
Fast Load-Transient Response
Built-In 20V, 3.2A, 100mI MOSFET
High Efficiency
3ms Internal Soft-Start
S Adjustable Positive Charge-Pump Regulator
S Adjustable Negative Charge-Pump Regulator
S Integrated High-Voltage Switch with Adjustable
Turn-On Delay
S High-Speed Operational Amplifier
Q200mA Short-Circuit Current
45V/µs Slew Rate
S High-Accuracy Reference for Gamma Buffer
Q1% Feedback Voltage
Up to 30mA Load Current
Low-Dropout Voltage 0.5V at 60mA
The positive and negative charge-pump regulators pro-
vide TFT gate-driver supply voltages. Both output volt-
ages can be adjusted with external resistive voltage-
dividers. A logic-controlled, high-voltage switch block
allows the manipulation of the positive gate-driver supply.
S External p-Channel Gate Control for AVDD
Sequencing
S PGOOD Comparator
The MAX17126/MAX17126A include one high-current
operational amplifier designed to drive the LCD back-
plane (VCOM). The amplifier features high output cur-
rent (Q200mA), fast slew rate (45V/Fs), wide bandwidth
(20MHz), and rail-to-rail outputs.
S Input Undervoltage Lockout and Thermal-
Overload Protection
S 48-Pin, 7mm x 7mm, Thin QFN Package
Ordering Information
Also featured in the MAX17126/MAX17126A is a high-
accuracy, high-voltage adjustable reference for gamma
correction.
PART
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
48 Thin QFN-EP*
48 Thin QFN-EP*
MAX17126ETM+
MAX17126AETM+
The MAX17126/MAX17126A are available in a small (7mm
x 7mm), ultra-thin (0.8mm), 48-pin thin QFN package and
operate over the -40NC to +85NC temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Applications
LCD TV Panels
Pin Configuration appears at end of data sheet.
_______________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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