參數(shù)資料
型號(hào)： MAX1748-MAX8726
廠商： Maxim Integrated Products, Inc.
元件分類(lèi)： DC/DC變換器
英文描述： Triple-Output TFT-LCD DC-DC Converters
中文描述： 三輸出的TFT - LCD的DC - DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 1/16頁(yè)
文件大?。?/td> 277K
代理商： MAX1748-MAX8726
General Description
The MAX1748 triple-output DC-DC converter in a low-
profile TSSOP package provides the regulated voltages
required by active matrix, thin-film transistor (TFT) liquid
crystal displays (LCDs). One high-power DC-DC con-
verter and two low-power charge pumps convert the
+3.3V to +5V input supply voltage into three independent
output voltages.
The primary high-power DC-DC converter generates a
boosted output voltage (V
MAIN
) up to 13V that is regu-
lated within ±1%. The low-power BiCMOS control cir-
cuitry and the low on-resistance (0.35
) of the
integrated power MOSFET allows efficiency up to 93%.
The 1MHz current-mode PWM architecture provides
fast transient response and allows the use of ultra-small
inductors and ceramic capacitors.
The dual charge pumps independently regulate one
positive output (V
POS
) and one negative output (V
NEG
).
These low-power outputs use external diode and
capacitor stages (as many stages as required) to regu-
late output voltages up to +40V and down to -40V. A
proprietary regulation algorithm minimizes output rip-
ple, as well as capacitor sizes for both charge pumps.
The MAX1748 is available in the ultra-thin TSSOP pack-
age (1.1mm max height).
________________________Applications
TFT Active Matrix LCD Displays
Passive Matrix LCD Displays
PDAs
Digital Still Cameras
Camcorders
Features
o
Three Integrated DC-DC Converters
o
1MHz Current-Mode PWM Boost Regulator
Up to +13V Main High-Power Output
±1% Accuracy
High Efficiency (93%)
o
Dual Charge-Pump Outputs
Up to +40V Positive Charge-Pump Output
Down to -40V Negative Charge-Pump Output
o
Internal Supply Sequencing
o
Internal Power MOSFETs
o
+2.7V to +5.5V Input Supply
o
0.1μA Shutdown Current
o
0.6mA Quiescent Current
o
Internal Soft-Start
o
Power-Ready Output
o
Ultra-Small External Components
o
Thin TSSOP Package (1.1mm max)
M
Triple-Output TFT LCD DC-DC Converter
________________________________________________________________
Maxim Integrated Products
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
RDY
TGND
LX
PGND
SUPP
DRVP
SUPN
DRVN
SHDN
TOP VIEW
MAX1748
TSSOP
FB
INTG
REF
IN
GND
FBP
FBN
Pin Configuration
19-1740; Rev 0; 6/00
Ordering Information
Typical Operating Circuit appears at end of data sheet.
16 TSSOP
PIN-PACKAGE
TEMP. RANGE
-40°C to +85°C
MAX1748EUE
PART
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