Rainbow Electronics MAX1664 - Manual

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________________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 (0.25
Ω
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.
________________________Applications
LCD Modules
LCD Panels
____________________________Features
♦ Integrates All Active Circuitry for Three DC-DC
Converters
♦ Ultra-Small External Components
(ceramic capacitors, 2µH to 5µH inductors)
♦ DC-DC Converters Phase-Locked to Backplane
Frequency for Lowest Noise
♦ Low Operating Voltage (down to +2.8V)
♦ Adjustable Output Voltage from V IN to +5.5V
♦ Load Currents Up to 500mA
♦ Adjustable TFT Gate Driver Output:
Positive, V
IN
to +28V
Negative, 0 to -10V (-20V with added
components)
♦ Includes 0.35
Ω
Backplane Driver
♦ 1µA Shutdown Current
♦ Power-Ready Output Signal
MAX1664
________________________________________________________________ Maxim Integrated Products 1
REF
FB2-
IN INP
LX2P
LX2N
FB2+
PGND2
PLLC
GND
FPLL
RDY
REF
SHDN
ON
OFF
5.5V
-10V
28V
BPV SS
BACKPLANE
DRIVER
V SUPPLY
2.8V TO 5.5V
BPDRV
BPV DD
PGND1
FB1
LX1
BPCLK
MAX1664
Typical Operating Circuit
___________________Pin Configuration
19-1356; Rev 0; 4/98
PART
MAX1664CUP 0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 TSSOP
_______________Ordering Information
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
FPLL
LX1
PGND1
PGND2 REF
FB1
RDY
SHDN
TOP VIEW
LX2N
LX2P
INP
BPCLK FB2+
FB2-
IN
GND
12
11
9
10
BPV DD
BPDRV BPV SS
PLLC
MAX1664
TSSOP
Active-Matrix Liquid Crystal Display
(AMLCD) Supply