MAX1882EUG Maxim Integrated, MAX1882EUG Datasheet
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MAX1882EUG
Manufacturer Part Number
MAX1882EUG
Description
LCD Drivers Quad-Output TFT LCD DC-DC Converter with Buffer
Manufacturer
Maxim Integrated
Datasheet
1.MAX1882EUG.pdf
(39 pages)
Specifications of MAX1882EUG
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Package / Case
TSSOP-24
Mounting Style
SMD/SMT
The MAX1778/MAX1880–MAX1885 multiple-output
DC-DC converters provide the regulated voltages
required by active matrix thin-film transistor (TFT) liquid
crystal displays (LCD) in a low-profile TSSOP package.
One high-power step-up converter and two low-power
charge pumps convert the 2.7V to 5.5V input voltage
into three independent output voltages. A built-in linear
regulator and VCOM buffer complete the power-supply
requirements.
The main step-up converter accurately generates an
externally set output voltage up to 13V that can supply
the display’s row/column drivers. The converter’s high
switching frequency and current-mode PWM architec-
ture provide fast transient response and allow the use
of small low-profile inductors and ceramic capacitors.
The low-power BiCMOS control circuitry and internal
14V switch (0.35Ω N-channel MOSFET) enable efficien-
cies up to 91%.
The dual low-power charge pumps (MAX1778/
MAX1880/MAX1881/MAX1882 only) independently reg-
ulate one positive output (V
put (V
diode and capacitor stages (as many stages as
required) to regulate output voltages up to +40V and
-40V. A unique control scheme minimizes output ripple
as well as capacitor sizes for both charge pumps.
A resistor-programmable, 40mA, low-dropout linear
regulator (MAX1778/MAX1881/MAX1883/MAX1884
only) provides preregulation or postregulation for any of
the supplies. For higher current applications, an exter-
nal transistor can be added. Additionally, the VCOM
buffer provides a high current output that is ideal for
driving the capacitive backplane of TFT LCD panels.
The VCOM buffer’s output voltage is preset with an
internal 50% resistive-divider or can be externally
adjusted for other voltages.
The MAX1778/MAX1880–MAX1885 are protected
against output undervoltage and thermal overload con-
ditions by a latched fault detection circuit that shuts
down the device. All devices are available in the ultra-
thin TSSOP package (1.1mm max height).
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
NEG
TFT LCD Notebook Displays
TFT LCD Desktop Monitor Panels
). These low-power outputs use external
General Description
POS
) and one negative out-
Applications
Quad-Output TFT LCD DC-DC
o 500kHz/1MHz Current-Mode PWM Step-Up
o Dual Regulated Charge-Pump Outputs
o Low-Dropout 40mA Linear Regulator
o Optional Higher Current with External Transistor
o 2.7V to 5.5V Input Supply
o Internal Supply Sequencing and Soft-Start
o Power-Ready Output
o Adjustable Fault-Detection Latch
o Thermal Protection (+160°C)
o 0.1µA Shutdown Current
o 0.7mA IN Quiescent Current
o Ultra-Small External Components
o Thin TSSOP Package (1.1mm max height)
Typical Operating Circuit appears at end of data sheet.
Pin Configurations and Selector Guide appear at end of
data sheet.
Converters with Buffer
+ Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
MAX1778EUG
MAX1778EUG+
MAX1880EUG
MAX1880EUG/V+
MAX1881EUG
MAX1882EUG
MAX1883EUP
MAX1884EUP
MAX1885EUP
Regulator
(MAX1778/MAX1880–MAX1882 only)
(MAX1778/MAX1881/MAX1883/MAX1884 only)
Up to +13V Main High-Power Output
±1% Accurate
High Efficiency (91%)
Up to +40V Positive Charge-Pump Output
Up to -40V Negative Charge-Pump Output
Up to +15V LDO Input
PART
MAX1880–MAX1885
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX1778/
19-1979; Rev 2; 10/12
PIN-PACKAGE
24 TSSOP
24 TSSOP
24 TSSOP
24 TSSOP
24 TSSOP
24 TSSOP
20 TSSOP
20 TSSOP
20 TSSOP
Features