19-1356; Rev 0; 4/98
Ac t ive -Ma t rix Liq u id Crys t a l Dis p la y
(AMLCD) S u p p ly
MAX164
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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.
♦ 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
High switching frequency (1MHz nominal) and phase-
loc ke d op e ra tion a llow the us e of s ma ll, minimum-
he ig ht e xte rna l c omp one nts while ma inta ining 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
a d jus te d to -20V with a d d itiona l c omp one nts . Als o
included are a logic-level shutdown and a “Ready” out-
put (RDY) that signals when all three outputs are in reg-
ulation.
♦ Low Operating Voltage (down to +2.8V)
♦ Adjustable Output Voltage from V to +5.5V
IN
♦ Load Currents Up to 500mA
♦ Adjustable TFT Gate Driver Output:
Positive, V to +28V
IN
Negative, 0 to -10V (-20V with added
components)
♦ Includes 0.35Ω Backplane Driver
♦ 1µA Shutdown Current
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 s up p lie d in a 1.1mm-hig h
TSSOP package.
♦ Power-Ready Output Signal
_______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
PIN-PACKAGE
MAX1664CUP
0°C to +70°C
20 TSSOP
________________________Ap p lic a t io n s
LCD Modules
Typ ic a l Op e ra t in g Circ u it
LCD Panels
V
SUPPLY
2.8V TO 5.5V
REF
IN
INP
LX1
___________________P in Co n fig u ra t io n
FB2-
5.5V
TOP VIEW
-10V
28V
LX2P
FB1
SHDN
RDY
FB1
1
2
3
4
5
6
7
8
9
20 FPLL
19 LX1
MAX1664
PGND1
LX2N
18 PGND1
17 PGND2
16 LX2N
15 LX2P
14 INP
REF
FB2+
BPV
DD
MAX1664
GND
IN
BACKPLANE
DRIVER
BPDRV
PGND2
PLLC
FB2-
FB2+
PLLC
BPV
SS
13 BPCLK
GND
FPLL
12 BPV
DD
ON
SHDN
REF
OFF
BPV 10
11 BPDRV
SS
RDY
BPCLK
TSSOP
________________________________________________________________ Maxim Integrated Products
1
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