MAX1664EUP Maxim Integrated Products, MAX1664EUP Datasheet

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MAX1664EUP

Manufacturer Part Number
MAX1664EUP
Description
Active-Matrix Liquid Crystal Display (AMLCD) Supply
Manufacturer
Maxim Integrated Products
Datasheet

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

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MAX1664EUP Summary of contents

Page 1

... PLLC 9 BPV 10 SS TSSOP ________________________________________________________________ Maxim Integrated Products 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. ____________________________Features Integrates All Active Circuitry for Three DC-DC Converters Ultra-Small External Components (ceramic capacitors, 2µH to 5µH inductors) ...

Page 2

Active-Matrix Liquid Crystal Display (AMLCD) Supply ABSOLUTE MAXIMUM RATINGS RDY, IN, BPV to GND...........................................-0.3V to +6V DD FB2-, PGND1, PGND2 to GND ..........................................±0.3V LX1 to PGND1 ..........................................................-0.3V to +6V BPV to GND .......................................................-3.3V to +0.3V SS BPVDD to BPV ......................................................-0.3V ...

Page 3

Active-Matrix Liquid Crystal Display ELECTRICAL CHARACTERISTICS (continued) = 3.3V, SHDN = IN INP BPVDD unless otherwise noted. Typical values are at T PARAMETER SYMBOL FB2+ Regulation Voltage V FB2+ FB2- Regulation Voltage V FB2- I ...

Page 4

Active-Matrix Liquid Crystal Display (AMLCD) Supply __________________________________________Typical Operating Characteristics (f = 22.5kHz, FPLL = GND 3.3µ 4.7µH, T BPCLK DC-DC 1 EFFICIENCY vs. LOAD CURRENT (V = +5V) OUT1 100 ...

Page 5

Active-Matrix Liquid Crystal Display (f = 22.5kHz, FPLL = GND 3.3µ 4.7µH, T BPCLK V LINE-TRANSIENT RESPONSE OUT1 A B 2ms/div 250mA OUT1 LOAD OUT1 A: V ...

Page 6

Active-Matrix Liquid Crystal Display (AMLCD) Supply (f = 22.5kHz, FPLL = GND 3.3µ 4.7µH, T BPCLK BPCLK TO BPDRV FALLING DELAY BPDRV BPCLK 100ns/div C = 10,000pF LOAD NO-LOAD SUPPLY CURRENT vs. INPUT VOLTAGE 1.8 1.6 ...

Page 7

Active-Matrix Liquid Crystal Display ______________________________________________________________Pin Description PIN NAME Shutdown Input. Drive low to enter shutdown mode. Drive high or connect to IN for normal operation. All IC SHDN 1 sections are off when SHDN is low. Ready Indicator Output, DC-DC ...

Page 8

Active-Matrix Liquid Crystal Display (AMLCD) Supply REF INP FB2- LX2P V OUT2- -10V V OUT2+ 28V LX2N FB2+ PGND2 PLLC BPCLK PHASE DET FPLL N IN REF GND Figure 1. Functional Diagram _______________Detailed Description The MAX1664 combines power supply and ...

Page 9

Active-Matrix Liquid Crystal Display Table 1. Switching Frequency Options f BPCLK FPLL (kHz REF GND See Figure 2 Fixed-frequency, current-mode operation ensures that the switching noise exists only at ...

Page 10

Active-Matrix Liquid Crystal Display (AMLCD) Supply PLLC PHASE VCO DETECTOR C R SHUNT PLLC C PLLC N* BPCLK *SEE TABLE 1 FOR SELECTED VALUES OF N. REF IN GND Figure 2. Internal PLL Operation within the MAX1664 The heart of ...

Page 11

Active-Matrix Liquid Crystal Display REF R5 49.9k R6 200k V OUT2- -5V 0. OUT2+ 15V R7 549k R8 49.9k 2.2nF 100k 22nF Figure 4. Detailed Typical Operating Circuit Inductor Selection The optimum inductor value for L1 ...

Page 12

Active Matrix Liquid Crystal Display (AMLCD) Supply Table 2. Typical DC-DC 2 Operation OUT2+ OUT2- IN BPCLK (V) (V) (V) (kHz) +15 -5 3.0 22.5 +15 -5 3.0 22.5 +15 -5 3.3 22.5 +15 -5 3.3 ...

Page 13

Active-Matrix Liquid Crystal Display Ceramic capacitors are recommended because they have low ESR and the lowest profile. Typical ceramic capacitors are the C3225X5R series from TDK and JMK325 series from Taiyo Yuden. See Table 3 for more information on the ...

Page 14

Active-Matrix Liquid Crystal Display (AMLCD) Supply Supply Connections and Layout The MAX1664 performs both precision analog and high-power switching functions. Carefully plan supply connections, bypassing, and layout. Bypass IN and INP with a 33Ω isolation resistor (R9, Figure 4) between ...

Page 15

Active-Matrix Liquid Crystal Display 1.0" Figure 7c. MAX1664 PC Board Layout—Solder Side ______________________________________________________________________________________ (AMLCD) Supply ___________________Chip Information TRANSISTOR COUNT: 838 15 ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA ...

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