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MAX1664

产品描述Active-Matrix Liquid Crystal Display AMLCD Supply
文件大小248KB,共16页
制造商Maxim(美信半导体)
官网地址https://www.maximintegrated.com/en.html
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MAX1664概述

Active-Matrix Liquid Crystal Display AMLCD Supply

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19-1356; Rev 0; 4/98
Active-Matrix Liquid Crystal Display
(AMLCD) Supply
________________General Description
The MAX1664 integrates power-supply and backplane
drive circuitry for active-matrix thin-film-transistor (TFT) liq-
uid crystal displays. Included are a single-output, pulse-
width-modulation boost converter (0.25Ω switch), a
dual-output (positive and negative) gate-driver supply
using one inductor, an LCD backplane driver, and a sim-
ple phase-locked loop to synchronize all three outputs.
High switching frequency (1MHz nominal) and phase-
locked operation allow the use of small, minimum-
height external components while maintaining low
output noise. A +2.8V to +5.5V input voltage range
allows operation with any logic supply. Output voltages
are adjustable to +5.5V (DC-DC 1) and to +28V and
-10V (DC-DC 2). The negative output voltage can be
adjusted to -20V with additional components. Also
included are a logic-level shutdown and a “Ready” out-
put (RDY) that signals when all three outputs are in reg-
ulation.
The boost-converter operating frequency can be set at
16, 24, or 32 times the backplane clock. This flexibility
allows a high DC-DC converter frequency to be used
with LCD backplane clock rates ranging from 20kHz to
72kHz. The MAX1664 is supplied in a 1.1mm-high
TSSOP package.
____________________________Features
o
Integrates All Active Circuitry for Three DC-DC
Converters
o
Ultra-Small External Components
(ceramic capacitors, 2µH to 5µH inductors)
o
DC-DC Converters Phase-Locked to Backplane
Frequency for Lowest Noise
o
Low Operating Voltage (down to +2.8V)
o
Adjustable Output Voltage from V
IN
to +5.5V
o
Load Currents Up to 500mA
o
Adjustable TFT Gate Driver Output:
Positive, V
IN
to +28V
Negative, 0 to -10V (-20V with added
components)
o
Includes 0.35Ω Backplane Driver
o
1µA Shutdown Current
o
Power-Ready Output Signal
MAX1664
_______________Ordering Information
PART
MAX1664CUP
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
20 TSSOP
________________________Applications
LCD Modules
LCD Panels
Typical Operating Circuit
V
SUPPLY
2.8V TO 5.5V
REF
___________________Pin Configuration
TOP VIEW
SHDN 1
RDY 2
FB1 3
REF 4
GND 5
IN 6
FB2- 7
FB2+ 8
PLLC 9
BPV
SS
10
20 FPLL
19 LX1
18 PGND1
17 PGND2
28V
-10V
IN
FB2-
LX2P
INP
LX1
FB1
PGND1
5.5V
MAX1664
LX2N
FB2+
MAX1664
16 LX2N
15 LX2P
14 INP
13 BPCLK
12 BPV
DD
11 BPDRV
PLLC
GND
FPLL
RDY
BPCLK
PGND2
BPV
DD
BPDRV
BPV
SS
SHDN
REF
ON
BACKPLANE
DRIVER
OFF
TSSOP
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.

 
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