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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1664 Datasheet

Active-Matrix Liquid Crystal Display AMLCD Supply

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MAX1664 pdf
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 (0.25switch), 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
___________________Pin Configuration
TOP VIEW
SHDN 1
RDY 2
FB1 3
REF 4
GND 5
IN 6
FB2- 7
FB2+ 8
PLLC 9
BPVSS 10
MAX1664
TSSOP
20 FPLL
19 LX1
18 PGND1
17 PGND2
16 LX2N
15 LX2P
14 INP
13 BPCLK
12 BPVDD
11 BPDRV
____________________________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 VIN to +5.5V
o Load Currents Up to 500mA
o Adjustable TFT Gate Driver Output:
Positive, VIN to +28V
Negative, 0 to -10V (-20V with added
components)
o Includes 0.35Backplane Driver
o 1µA Shutdown Current
o Power-Ready Output Signal
_______________Ordering Information
PART
MAX1664CUP
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
20 TSSOP
Typical Operating Circuit
REF
IN INP
FB2- LX1
-10V LX2P FB1
MAX1664
PGND1
28V LX2N
VSUPPLY
2.8V TO 5.5V
5.5V
FB2+ BPVDD
PGND2 BPDRV
BACKPLANE
DRIVER
PLLC
GND
FPLL
RDY
BPCLK
BPVSS
SHDN
REF
ON
OFF
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1664 Datasheet

Active-Matrix Liquid Crystal Display AMLCD Supply

No Preview Available !

MAX1664 pdf
Active-Matrix Liquid Crystal Display
(AMLCD) Supply
ABSOLUTE MAXIMUM RATINGS
RDY, IN, BPVDD to GND...........................................-0.3V to +6V
FB2-, PGND1, PGND2 to GND ..........................................±0.3V
LX1 to PGND1 ..........................................................-0.3V to +6V
BPVSS to GND .......................................................-3.3V to +0.3V
BPVDD to BPVSS ......................................................-0.3V to +6V
BPDRV to BPVSS ..................................-0.3V to (VBPVDD + 0.3V)
LX2P to INP ............................................................-15V to +0.3V
LX2N to PGND2......................................................-0.3V to +30V
SHDN, INP, FB1, FB2+, REF, PLLC,
BPCLK, FPLL to GND ................................-0.3V to (VIN +0.3V)
RDY Sink Current ................................................................20mA
LX2P, LX2N Peak Switch Currents .................................±750mA
Continuous Power Dissipation (TA = +70°C)
20-Pin TSSOP (derate 7mW/°C above+70°C) ..............559mW
Operating Temperature Range...............................0°C to +70°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VINP = 3.3V, SHDN = IN, VBPVDD = 4V, VBPVSS = -1V, PGND1 = PGND2 = FPLL = GND, fBPCLK = 30kHz, TA = 0°C to +70°C,
unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Supply Range
VIN
2.8 5.5 V
Undervoltage Lockout
Threshold
VUVLO
2.5 2.8 V
Quiescent Current
IQ
VFB1+ = VFB2+ = 1.3V, VFB2- = -0.1V;
IIN + IINP
Shutdown Current
ISD SHDN = GND, VIN = 5.5V; IIN + IINP
DC-DC 1 (PWM MAIN OUTPUT)
Output Voltage Range
VOUT1
FPLL = GND
Operating Frequency
fOP1 FPLL = REF
FPLL = IN
FB1 Regulation Voltage
VFB1 0 < ILX1 < 1.2A
FB1 Input Bias Current
IFB1 VFB1 = 1.3V
LX1 On Resistance
RON(LX1)
LX1 Leakage Current
ILKG(LX1) VLX1 = 6V
LX1 Peak Current Limit
ILIM(LX1)
Power-Ready Trip Level
VTH_RDY Rising edge, 2% hysteresis
DC-DC 2 (PFM)
Positive Output Voltage Range VOUT2+
Negative Output Voltage Range VOUT2-
FPLL = GND
Maximum Operating Frequency fOP2(MAX) FPLL = REF
FPLL = IN
0.5 2
0.01 10
mA
µA
VIN 5.5
32 x fBPCLK
24 x fBPCLK
16 x fBPCLK
1.2125 1.2500 1.275
100
0.25 0.5
0.1 10
1.2 1.5 1.8
1.091 1.125 1.159
V
Hz
V
nA
µA
A
V
VIN
-10
16 x fBPCLK
12 x fBPCLK
8 x fBPCLK
28
0
V
V
Hz
2 _______________________________________________________________________________________


Part Number MAX1664
Description Active-Matrix Liquid Crystal Display AMLCD Supply
Maker Maxim
Total Page 16 Pages
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