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MAX17122 fiches techniques PDF

Maxim Integrated Products - Boost-Buck Regulator

Numéro de référence MAX17122
Description Boost-Buck Regulator
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX17122 fiche technique
19-4951; Rev 1; 11/09
EVAALVUAAILTAIOBNLEKIT
Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
General Description
The MAX17122 multiple-output power-supply IC gener-
ates all the supply rails for thin-film transistor (TFT) liquid-
crystal display (LCD) TV panels. It can operate from 8V
to 16.5V input voltages and is optimized for LCD TV
panel applications running directly from 12V regulated
supplies. It includes a 22V internal-switch step-down
regulator for digital logic, a 22V internal switch step-
up regulator to power the TFT source drivers, and a
temperature-compensated 36V internal-switch boost-
buck regulator that produces a negative output that can
vary according to the temperature sensed by an exter-
nal NTC thermistor. All three of these regulators feature
high-efficiency and fixed-frequency operation. High-
frequency operation allows the use of small inductors
and capacitors, resulting in a compact solution.
The MAX17122 includes a positive charge-pump linear
regulator controller that uses an external pnp bipolar
junction transistor (BJT) to typically form a regulated
charge-pump doubler to supply the LCD positive gate-
driver supply voltage. A negative gate-driver supply is
derived linearly between the boost-buck regulator’s out-
put and ground, using an external npn BJT connected to
ground and a small bypass capacitor.
Other features include an external-capacitor-timed,
open-drain, power-good output that monitors the step-
down regulator’s feedback and a simple untimed output
that monitors the positive charge-pump linear regulator’s
feedback. A high-voltage stress function is available for
the step-up regulator output. The GATE output directly
drives an external p-channel MOSFET to provide True
ShutdownK of the step-up output.
The MAX17122 is available in a 6mm x 6mm, 40-pin thin
QFN lead-free package and operates over the -40NC to
+85NC temperature range.
LCD TV Panels
Applications
Features
S 8V to 16.5V Operating Range
S 750kHz Switching Frequency
S 22V Internal-Switch High-Performance Step-Up
Regulator
Fast Load-Transient Response
Current-Mode PWM Operation
100mI, 3.9A nMOS Switch
Capacitor-Adjustable Soft-Start
High-Voltage Stress Function
Drives External pMOS Shutdown Switch
S 22V Internal-Switch Step-Down Regulator
Preset 1% Accurate 3.3V Output Voltage or
Adjustable Output (Dual Mode™)
Current-Mode PWM Operation
200mI, 2.5A nMOS Switch
Capacitor-Adjustable Power-Good Output
S 36V Internal-Switch Boost-Buck Regulator
Temperature-Compensated Output
Programmable Fixed Levels with Temperature-
Controlled Transition
Current-Mode PWM Operation
200mI, 1.8A pMOS Switch
S Positive Charge-Pump Linear Regulator Controller
Adjustable 1% Accurate Output Voltage
Uses External pnp Transistor
Regulates Switching-Node-Driven Charge-
Pump Doubler
Power-Good Output
S Negative Linear Regulator Controller
Adjustable 1.5% Accurate Output Voltage
Uses External npn Transistor
S Soft-Start for All Outputs
S Adjustable Power-Up Sequence
S Timed-Output Fault Protection with Restart for All
Outputs
S Latched Thermal-Shutdown Protection
S 40-Pin, 6mm x 6mm Thin QFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17122ETL+ -40NC to +85NC
40 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
True Shutdown and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
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.
http://www.Datasheet4U.com

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