High-Current VCOM Drive Buffer MAX1886 high-current operational t

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High-Current VCOM Drive Buffer MAX1886 high-current operational t

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19-2095; 8/01
High-Current VCOM Drive Buffer
MAX1886 high-current operational transconductance amplifier. MAX1886 ideal driving backplane active matrix, inversion thin film transistor (TFT) liquid crystal display (LCD). MAX1886's high >500mA peak-current drive capability provides fast response pulsed load conditions. MAX1886 stable from 0.47µF unlimited amount output capacitance. MAX1886 available low-profile (1.1mm max) 5-pin Thin SOT23 package fully specified over -40°C +85°C extended temperature range.
Features
Stable with 0.47µF Unlimited Amount Output Capacitance Over 500mA Peak Drive Current Excellent Settling Characteristics with Capacitive Load +4.5V +13V Input Supply 0.45mA Quiescent Current Thermal Fault Protection Thin SOT23-5 Package (1.1mm max)
MAX1886
Applications
Notebook Panels Monitor Panels
PART MAX1886EZK
Ordering Information
TEMP. RANGE -40°C +85°C PIN-PACKAGE Thin SOT23-5* MARK ADQL
*Requires special solder temperature profile described Absolute Maximum Ratings section.
Typical Operating Circuit
Configuration
VIEW
VREF
MAX1886
MAX1886
THIN SOT23-5
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
High-Current VCOM Drive Buffer MAX1886
ABSOLUTE MAXIMUM RATINGS
.-0.3V +14V FB-, FB+, GND.-0.3V (VCC 0.3V) Continuous Power Dissipation +70°C) 5-Pin Thin SOT23 (derate 7.1mW°C above +70°C) .727mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +150°C
This device constructed using unique packaging techniques that impose limit thermal profile device exposed during board level solder attach rework. Maxim recommends solder profiles recommended industry-standard specification, JEDEC 020A, paragraph 7.6, Table IR/VPR convection reflow processes. Preheating, this standard, required. Hand wave soldering recommended. Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC 10V, OUT, VFB+ COUT 0.47µF, -40°C +85°C, unless otherwise noted. Typical values +25°C.) (Note
PARAMETER Input Supply Range Supply Current Input Offset Voltage Input Bias Current Input Offset Current Common-Mode Input Range Power-Supply Rejection Ratio Common-Mode Rejection Ratio Gain-Bandwidth Product Transconductance Output Current Drive Thermal Shutdown Thermal Shutdown Hysteresis SYMBOL IBIAS PSRR CMRR IOUT VFB+ +5V, load +1.2V +8.8V -100 -100 1/6CL ±175 ±250 ±550 CONDITIONS 1.2V UNITS
|VOS| 10mV over
+4.5V +13V, VFB+ +2.25V +1.2V +8.8V Small signal Small signal (±1mV overdrive) Large signal (±30mV overdrive) ±100mV overdrive, VOUT -40°C +85°C +85°C
Note MAX1886 100% production tested +25°C. Specifications over temperature guaranteed design.
SUPPLY VOLTAGE
REFERENCE VOLTAGE
0.47 0.47
MAX1886
Figure Load Transient Test Circuit
High-Current VCOM Drive Buffer
Typical Operating Characteristics
(VCC 10V, COUT 1µF, +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE DEVIATION SUPPLY VOLTAGE
MAX1886 toc01
MAX1886
INPUT OFFSET VOLTAGE DEVIATION TEMPERATURE
MAX1886 toc02
TRANSCONDUCTANCE OUTPUT CURRENT
MAX1886 toc03
0.10 0.08 0.06 0.04 (mV) 0.02 VCC/2
(mV) -0.1 -0.2 -0.3 -0.4 VCC/2
TRANSCONDUCTANCE -40°C +25°C +85°C
-0.02 -0.04 -0.06 -0.08 -0.10
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
SUPPLY CURRENT SUPPLY VOLTAGE
MAX1886 toc04
NO-LOAD SUPPLY CURRENT TEMPERATURE
MAX1886 toc05
LOAD TRANSIENT ±10V
IOUT 500mA/div
MAX1886 toc06
SUPPLY CURRENT (mA) 10.5 12.5 SUPPLY VOLTAGE -40°C +85°C +25°C
SUPPLY CURRENT (mA)
VOUT 200mV/div AC-COUPLED
10V/div 2.5, 100nF, FIGURE 4µs/div TEMPERATURE (°C)
SHORT-CIRCUIT WAVEFORMS
500mA/div
MAX1886 toc07
IOUT 500mA/div
VOUT 5V/div 5V/div 20ms/div
High-Current VCOM Drive Buffer MAX1886
Typical Operating Characteristics (continued)
(VCC 10V, COUT 1µF, +25°C, unless otherwise noted.)
STARTUP WAVEFORMS WITH SOFT-START
MAX1886 toc08 MAX1886 toc09
STARTUP WAVEFORM WITHOUT SOFT-START
500mA/div SUPPLY CAPACITOR CHARGING CURRENT
500mA/div 10V/div VFB+ 5V/div VOUT 5V/div 500µs/div
10V/div VFB+ 5V/div VOUT 5V/div 5µs/div
COUT 0.47µF
COUT 0.47µF
Description
NAME FBDESCRIPTION Output Buffer Amplifier. Requires minimum 0.47µF ceramic filter capacitor GND. Place capacitor close OUT. Ground Voltage-Supply Input. Bypass with 0.47µF capacitor close pin. output capacitor preceding voltage regulator additional filter capacitor. Noninverting Input Buffer Amplifier Inverting Input Buffer Amplifier. Feedback must taken from output filter capacitor terminal.
Detailed Description
MAX1886 operational transconductance amplifier (OTA) provides high-current output that ideal driving capacitive loads such backplane panel. positive feedback input, FB+, allows common-mode biasing mid-supply, other VCOM voltage. MAX1886 unity-gain bandwidth gm/COUT where amplifier's transconductance. Transconductance ratio output current input voltage. gain amplifier dependent upon load. MAX1886 requires only small 0.47µF ceramic output capacitor stability. bandwidth inversely proportional output capacitor, large capacitive loads improve stability; however, lower bandwidth decreases buffer's transient response time. improve transient response
times, MAX1886's transconductance increases output current increases (see Typical Operating Characteristics).
Applications Information
Output Filter Capacitor
MAX1886 requires minimum 0.47µF output capacitance placed close OUT. ensure buffer stability, output capacitor must lower. Ceramic capacitors excellent choice.
Input Bypass Capacitor
MAX1886 requires 0.47µF input bypass capacitor (C2) close supply input (see Figure Place MAX1886 close preceding voltage regulator output capacitor that MAX1886 shares same capacitor (C1). Minimize trace length wide
High-Current VCOM Drive Buffer MAX1886
SWITCHING REGULATOR
SOURCE DRIVER VOLTAGE BOARD PARASITICS
LINEAR REGULATOR
0.47µF
OPTIONAL REFERENCE VOLTAGE CIRCUIT GAMMA CORRECTION REFERENCE VOLTAGE
0.47µF BACKPLANE
MAX1886
Figure Typical Backplane Drive Circuit
traces between voltage regulator output MAX1886 input reduce board parasitics (inductance, resistance, capacitance), which cause undesired ringing.
Voltage Reference
reference voltage MAX1886 input produced using output linear regulator. linear regulator will reject ripple voltage produced source drivers (see Figure output this linear regulator also used gamma correction reference voltage.
Chip Information
TRANSISTOR COUNT: PROCESS: BiCMOS
High-Current VCOM Drive Buffer MAX1886
Package Information
High-Current VCOM Drive Buffer
Package Information (continued)
MAX1886
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

High-Current VCOM Drive Buffer MAX1886 high-current operational t

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