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MAX8758ETG-MAX8758ETG+
Step-Up Regulator with Switch Control and Operational Amplifier for TFT LCD
General DescriptionThe MAX8758 includes a high-performance step-up regu-
lator, a high-speed operational amplifier, and a logic-
controlled, high-voltage switch-control block with pro-
grammable delay. The device is optimized for thin-film
transistor (TFT) liquid-crystal display (LCD) applications.
The step-up DC-DC regulator provides the regulated sup-
ply voltage for the panel source driver ICs. The converter
is a high-frequency (640kHz/1.2MHz), current-mode regu-
lator with an integrated 14V n-channel power MOSFET.
The high-switching frequency allows the use of ultra-small
inductors and ceramic capacitors. The current-mode con-
trol architecture provides fast transient response to pulsed
loads. The regulator achieves efficiencies over 85% by
bootstrapping the supply rail of the internal gate driver
from the step-up regulator output. The step-up regulator
features undervoltage lockout (UVLO), soft-start, and
internal current limit. The high-current operational amplifier
is designed to drive the LCD backplane (VCOM). The
amplifier features high output current (±150mA), fast slew
rate (7.5V/µs), wide bandwidth (12MHz), and rail-to-rail
inputs and outputs.
The MAX8758 is available in a 24-pin, 4mm x 4mm, thin
QFN package with a maximum thickness of 0.8mm for
ultra-thin LCD panels. The device operates over the
-40°C to +85°C temperature range.
ApplicationsNotebook Displays
LCD Monitors
Features1.8V to 5.5V Input Voltage RangeInput Undervoltage Lockout0.5mA Quiescent Current640kHz/1.2MHz Current-Mode Step-Up Regulator
Fast Transient Response
High-Accuracy Output Voltage (1.5%)
Built-In 14V, 2.5A, 115mΩMOSFET
High Efficiency
Programmable Soft-Start
Current Limit with Lossless Sensing
Timer-Delay Fault LatchHigh-Speed Operational Amplifier
±150mA Output Current
7.5V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Inputs/OutputsDual-Mode™, Logic-Controlled, High-Voltage
Switch with Programmable DelayThermal-Overload Protection24-Pin, 4mm x 4mm, Thin QFN Package
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
Ordering Information
Simplified Operating Circuit19-3699; Rev 1; 9/05
*EP = Exposed pad.
+Denotes lead-free package.
Pin Configuration appears at end of data sheet.DualMode is a trademark of Maxim Integrated Products, Inc.
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VSHDN= +3V, OUT = +10V, FREQ = GND, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, SHDN, CTL, LDO to GND...................................-0.3V to +6V
SUPB, LX, OUT to GND..........................................-0.3V to +14V
OUTB, NEGB, POSB to GND..................-0.3V to (SUPB + 0.3V)
THR, DLP, MODE, FREQ, COMP, FB,
SS to GND..............................................-0.3V to VLDO + 0.3V
PGND to GND......................................................-0.3V to + 0.3V
SRC to GND..........................................................-0.3V to + 30V
GON, DRN to GND....................................-0.3V to VSRC + 0.3V
GON RMS Current Rating................................................±50mA
OUTB RMS Current Rating..............................................±60mA
LX RMS Current Rating.........................................................1.6A
Continuous Power Dissipation (TA= +70°C)
24-Pin, 4mm x 4mm Thin QFN
(derate 16.9mW/°C above +70°C)..........................1349.1mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
ELECTRICAL CHARACTERISTICS (continued)(VIN= VSHDN= +3V, OUT = +10V, FREQ = GND, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
ELECTRICAL CHARACTERISTICS (continued)(VIN
ELECTRICAL CHARACTERISTICS(VIN= VSHDN= +3V, OUT = +10V, FREQ = GND, TA
= -40°C to +85°C, unless otherwise noted.) (Note 2)
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VSHDN= +3V, OUT = +10V, FREQ = GND, TA= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 2:-40°C specs are guaranteed by design, not production tested.
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
Typical Operating Characteristics
(Circuit of Figure1, VIN= 3.3V, VMAIN= 8.5V, FREQ = SHDN= IN, TA= +25°C, unless otherwise noted.)
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
Typical Operating Characteristics (continued)
(Circuit of Figure1, VIN= 3.3V, VMAIN= 8.5V, FREQ = SHDN= IN, TA= +25°C, unless otherwise noted.)
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
Typical Operating Characteristics (continued)
(Circuit of Figure1, VIN= 3.3V, VMAIN= 8.5V, FREQ = SHDN= IN, TA= +25°C, unless otherwise noted.)
MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
Pin Description
MAX8758ypical Operating Circuit
The typical operating circuit (Figure1) of the MAX8758
is a power-supply solution for TFT LCD panels in note-
book computers. The circuit generates a +8.5V source
driver supply, and approximately +22V and -7V gate
driver supplies. The input voltage range for the IC is
from +1.8V to +5.5V, but the Figure1 circuit is
designed to run from 2.7V to 3.6V. Table1 lists some
selected components and Table2 lists the contact
information of component suppliers.
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
