Rainbow Electronics MAX17075 - Manual

General Description
The MAX17075 includes a high-voltage boost regulator,
one high-current operational amplifier, two regulated
charge pumps, and one MLG block for gate-driver
supply modulation.
The step-up DC-DC converter is a 1.2MHz current-
mode boost regulator with a built-in power MOSFET. It
provides fast load-transient response to pulsed loads
while producing efficiencies over 85%. The built-in
160m
Ω (typ) power MOSFET allows output voltages as
high as 18V boosted from inputs ranging from 2.5V to
5.5V. A built-in 7-bit digital soft-start function controls
startup inrush currents.
The gate-on and gate-off charge pumps provide regu-
lated TFT gate-on and gate-off supplies. Both output
voltages can be adjusted with external resistive
voltage-dividers.
The operational amplifier, typically used to drive the
LCD backplane (VCOM), features high-output short-cir-
cuit current (±500mA), fast slew-rate (45V/µs), wide
bandwidth (20MHz), and rail-to-rail outputs.
The MAX17075 is available in a 24-pin thin QFN pack-
age with 0.5mm lead spacing. The package is a square
(4mm x 4mm) with a maximum thickness of 0.8mm for
ultra-thin LCD design. It operates over the -40°C to
+85°C temperature range.
Applications
Notebook Computer Displays
LCD Monitor Panels
LCD TVs
Features
♦ 2.5V to 5.5V Input Operating Range
♦ Current Mode Step-Up Regulator
Fast-Transient Response
Built-In 20V, 3A, 0.16
Ω n-Channel Power MOSFET
Cycle-by-Cycle Current Limit
87% Efficiency (5V Input to 13V Output)
1.2MHz Switching Frequency
±1% Output Voltage Regulation Accuracy
♦ High-Current 18V VCOM Buffer
±500mA Output Short-Circuit Current
45V/µs Slew Rate
20MHz -3dB Bandwidth
Rail-to-Rail Output
♦ Regulated Charge Pump for TFT Gate-On Supply
♦ Regulated Charge Pump for TFT Gate-Off Supply
♦ Logic-Controlled High-Voltage Switches with
Adjustable Delay
♦ Soft-Start and Timed Delay Fault Latch for All
Outputs
♦ Overload and Thermal Protection
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX17075
AGND
VCC
BGND
DRVN
REF
FBN
POS
NEG
OUT
LX
PGND
RSTIN
FB
COMP
DRN
RST
COM
SRC
DRVP
FBP
SUP CTL EP DEL
R1
10 Ω
C5
1 μF
V AVDD
TO V COM
BGND
V IN
2.5V TO 5.5V
V GON
V GOFF
FROM
SYSTEM
3.3V
V IN
V MAIN
FROM
TCON
Simplified Operating Circuit
19-4353; Rev 0; 11/08
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX17075ETG+ -40 °C to +85°C 24 TQFN-EP*
* EP = Exposed paddle.
+ Denotes a lead-free/RoHS-compliant package.
Pin Configuration appears at end of data sheet.