MAX1748 Maxim, MAX1748 Datasheet
MAX1748
Manufacturer Part Number
MAX1748
Description
Triple-Output TFT LCD DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX1748.pdf
(16 pages)
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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
lated within ±1%. The low-power BiCMOS control cir-
cuitry and the low on-resistance (0.35Ω) 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
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).
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.
19-1740; Rev 0; 6/00
Typical Operating Circuit appears at end of data sheet.
________________________Applications
TFT Active Matrix LCD Displays
Passive Matrix LCD Displays
PDAs
Digital Still Cameras
Camcorders
POS
________________________________________________________________ Maxim Integrated Products
Triple-Output TFT LCD DC-DC Converter
) and one negative output (V
General Description
MAIN
) up to 13V that is regu-
NEG
).
o Three Integrated DC-DC Converters
o 1MHz Current-Mode PWM Boost Regulator
o Dual Charge-Pump Outputs
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)
MAX1748EUE
TOP VIEW
PART
Up to +13V Main High-Power Output
±1% Accuracy
High Efficiency (93%)
Up to +40V Positive Charge-Pump Output
Down to -40V Negative Charge-Pump Output
INTG
GND
RDY
FBN
REF
FBP
FB
IN
TEMP. RANGE
1
2
3
4
5
6
7
8
-40°C to +85°C
Ordering Information
MAX1748
TSSOP
Pin Configuration
16
15
14
13
12
11
10
9
PIN-PACKAGE
16 TSSOP
TGND
LX
PGND
SUPP
DRVP
SUPN
DRVN
SHDN
Features
1
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