MAX8740 Maxim Integrated Products, MAX8740 Datasheet
MAX8740
Manufacturer Part Number
MAX8740
Description
TFT-LCD Step-Up DC-DC Converter
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8740.pdf
(12 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX8740ETB+T
Manufacturer:
MAXIM/美信
Quantity:
20 000
The MAX8740 is a high-performance, step-up DC-DC
converter that provides a regulated supply voltage for
active-matrix, thin-film transistor (TFT), liquid-crystal
displays (LCDs). The MAX8740 incorporates current-
mode, fixed-frequency, pulse-width modulation (PWM)
circuitry with a built-in n-channel power MOSFET to
achieve high efficiency and fast transient response.
Users can select 640kHz or 1.2MHz operation using a
logic input pin (FREQ). The high switching frequencies
allow the use of ultra-small inductors and low-ESR
ceramic capacitors. The current-mode architecture pro-
vides fast transient response to pulsed loads. A com-
pensation pin (COMP) gives users flexibility in adjusting
loop dynamics. The 30V internal MOSFET can generate
output voltages up to 28V from a 2.6V and 5.5V input
voltage range. Soft-start slowly ramps the input current
and is programmed with an external capacitor.
The MAX8740 is available in a 10-pin thin DFN package.
19-3698; Rev 0; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
www.DataSheet4U.com
Notebook Computer Displays
LCD Monitor Panels
TOP VIEW
10
________________________________________________________________ Maxim Integrated Products
1
9
2
General Description
MAX8740
3mm x 3mm
THIN DFN
8
3
Pin Configuration
7
4
TFT-LCD Step-Up DC-DC Converter
Applications
6
5
♦ 90% Efficiency
♦ Adjustable Output from V
♦ 2.6V to 5.5V Input Supply Range
♦ Input Supply Undervoltage Lockout
♦ Pin-Programmable 640kHz/1.2MHz Switching
♦ Programmable Soft-Start
♦ 0.1µA Shutdown Current
♦ Small, 10-Pin Thin DFN Package
MAX8740ETB
2.6V TO 5.5V
Frequency
PART
V
IN
Minimal Operating Circuit
-40°C to +85°C
TEMP RANGE
10
8
9
3
IN
FREQ
SHDN
SS
Ordering Information
LX
6
MAX8740
IN
to 28V
PIN-PACKAGE
10 TDFN 3mm x 3mm
LX
COMP
7
GND
GND
FB
2
5
4
1
Features
V
OUT
1
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