The MAX17014 multiple-output power-supply controller
generates all the supply rails for thin-film transistor
(TFT) liquid-crystal display (LCD) panels in TVs and
monitors operating from a regulated 12V input. It
includes a step-down and a step-up regulator, a positive
and a negative charge pump, two operational
amplifiers, and a Dual Mode™ logic-controlled high-voltage
switch control block. The MAX17014 can operate
from 8V to 16.5V input voltages and is optimized for
LCD TV panel and LCD monitor applications running
directly from 12V supplies.
The step-up and step-down regulators feature internal
power MOSFETs and high-frequency operation allowing
the use of small inductors and capacitors, resulting
in a compact solution. Both switching regulators use
fixed-frequency current-mode control architectures,
providing fast load-transient response and easy compensation.
A current-limit function for internal switches
and output-fault shutdown protect the step-up and
step-down power supplies against fault conditions. The
MAX17014 provides soft-start functions to limit inrush
current during startup. The MAX17014 provides
adjustable power-up timing.
The positive and negative charge-pump regulators provide
TFT gate driver supply voltages. Both output voltages
can be adjusted with external resistive
voltage-dividers. The switch control block allows the
manipulation of the positive TFT gate driver voltage.
The MAX17014 includes two high-current operational
amplifiers designed to drive the LCD backplane
(VCOM). The amplifier features high output current
(±150mA), fast slew rate (100V/µs), wide bandwidth
(20MHz), and rail-to-rail inputs and outputs. A series
p-channel MOSFET is integrated to sequence power to
AVDD after the MAX17014 has proceeded through
normal startup, and provides True Shutdown™.
The MAX17014 is available in a small (7mm x 7mm),
low-profile (0.8mm), 48-pin thin QFN package and
operates over a -40°C to +85°C temperature range.
Key Features
Applications/Uses
Optimized for 10.8V to 13.2V Input Supply
8V to 16.5V Input Supply Range
Selectable Frequency (600kHz/1.2MHz)
Current-Mode Step-Up Regulator
Built-In 20V, 3.3A, 110mΩ n-Channel MOSFET
High-Accuracy Output Voltage (1%)
True Shutdown
Fast Load-Transient Response
High Efficiency
3ms Internal Soft-Start
Current-Mode Step-Down Regulator
Built-In 20V, 2.5A, 120mΩ n-Channel MOSFET
Fast Load-Transient Response
Adjustable Output Voltage Down to 1.25V
Skip Mode at Light Load
High Efficiency
3ms Internal Soft-Start
Adjustable Positive and Negative Charge-Pump Regulators
Soft-Start and Timer-Delay Fault Latch for All Outputs
Logic-Controlled High-Voltage Integrated Switches with Adjustable Delay
Two High-Speed Operational Amplifiers
±150mA Short-Circuit Current
100V/µs Slew Rate
20MHz, -3dB Bandwidth
120mΩ p-Channel FET for AVDD Sequencing
Input Undervoltage Lockout and Thermal-Overload Protection
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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