Dropout Voltage Regulator Product Specification Revision Septembe

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Dropout Voltage Regulator Product Specification Revision Septembe

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AQ1117
Dropout Voltage Regulator
Product Specification Revision September 2005
AQ1117 dropout three terminal voltage regulator, offered popular fixed options adjustable version that precise voltage from 1.22V with external resistors. AQ1117 offered SOT-89 which lower thermal resistance fits smaller foot print than standard SOT-223. With dropout voltage less than volt, AQ1117 used applications where drop voltage size issue. assure accuracy within 1.5% over temperature heart AQ1117 selfcorrecting AcuRefbandgap reference. On-chip current limit thermal shutdown with hysteresis protects against combination overload ambient temperature that might cause junction temperature exceed safe limits.
Applications Graphic cards motherboards Switching power supply post-regulation Telecom equipment video player Features Featured small SOT- package Vout tolerance 1.5% over temperature Stable with cost capacitor dropout voltage Amp) Thermal protection with hysteresis Short circuit protection Offered with 1.8V, 2.5V, 3.3V fixed
adjustable output RoHS complaint available
Typical Application
www.acutechnology.com
AQ1117
Acutechnology Semiconductor Inc.
AQ1117
Configuration SOT-89
Descriptions
Name VOUT Ground/Adjust Function Accepts Regulated Output fixed option Adjust adjustable option
Functional Block Diagram
www.acutechnology.com
Rev. September 2005
Acutechnology Semiconductor Inc.
AQ1117
Ordering Information
Device AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 AQ1117
Note:
Operating 125C° 125C° 125C° 125C° 125C° 125C° 125C° 125C°
%Tol
Type SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3
VOUT 1.8V 1.8V 2.5V 2.5V 3.3V 3.3V
Wrap
Ordering Number AQ1117CY-M1-18-TR AQ1117CY-M1-18-TRL AQ1117CY-M1-25-TR AQ1117CY-M1-25-TRL AQ1117CY-M1-33-TR AQ1117CY-M1-33-TRL AQ1117CY-M1-AJ-TR AQ1117CY-M1-AJ-TRL
parts Lead Free RoHS compliant.
Absolute Maximum Ratings
Stress greater than those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these conditions beyond those indicated under recommended Operating Conditions implied. Exposure "Absolute Maximum Rating" extended periods affect device reliability. standard handling precautions required. Parameter Maximum Power Dissipation (Internally limited) Maximum Junction Temperature Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 4sec.) packages Value Units Volts
Thermal Management
Thermal Resistance (Junction Tab) SOT-89
Typical Value
Units °C/W
Thermal Resistance (Junction Ambient) SOT-89 (tab soldered copper PCB)
Typical Value
Units °C/W
www.acutechnology.com
Rev. September 2005
Acutechnology Semiconductor Inc.
AQ1117
Electrical Specifications
Electrical characteristics guaranteed over full temperature range <Tj< Ambient temperature must de-rated based upon power dissipation package thermal characteristics. Unless otherwise specified: (VOUT 1.5V), IOUT 25C. values bold over full temperature range. Symbol VOUT LNREG LDREG Parameter Output Voltage Line Regulation Load Regulation Conditions 125°C VOUT (1.5V 10V) IOUT (10mA Amp) IOUT Drop Voltage IOUT IOUT IQON Current Limit Quiescent Current VIN-VOUT 125°C Adjustable version only 125°C Adjustable version only 10mA IOUT 1Amp Maintain regulation 1.208 1.202 0.005 0.003 Junction Temperature 1.220 -1.5 VOUT VOUT 0.035 0.91 0.93 0.95 1.232 1.238 +1.5 0.95 0.95 Units %/°C %/°C VOUT
VADJ IADJ IADJ IQMIN PSRR TSDHYST
Reference Voltage Adjust Current Adjust Current Change Minimum Load Current Temperature Coefficient Temperature Stability Output Noise Ripple Rejection Ratio Thermal Shutdown Hysteresis
Notes: duty cycle pulse testing with Kelvin connections required. Measure (VIN VOUT) when VOUT, VREF Bandwidth 10Hz 10kHz 120Hz input ripple Adjustable version only
www.acutechnology.com
Rev. September 2005
Acutechnology Semiconductor Inc.
AQ1117
Application Notes
Typical Application
Notes: Output voltage 1.22V +R1)/R1 Input output capacitors should located close device. AQ1117 will remain stable with 1.0µF. Overall transient performance improved with increased capacitance.
Stability
input capacitor recommended. 1.0µF capacitor input suitable input bypassing almost applications. larger capacitor also suitable. adjustable version "adjust" terminal bypassed ground with bypass capacitor (CADJ) improve ripple rejection. This bypass capacitor prevents ripple from being amplified output voltage increased. ripple frequency, impedance CADJ should less than (being resistor between output adjust pin) prevent ripple from being amplified: 1/(2*fRIPPLE* CADJ) normally range output capacitor critical maintaining regular stability. AQ1117 stable with output capacitor greater than. course increase output capacitor will merely improve loop stability load transient response. case adjustable regulator, when CADJ used, larger output capacitance required. Tantalum Capacitors exhibit best stability over wide range loads recommended.
Output Voltage
AQ1117 adjustable version develops 1.22V reference voltage between output adjust terminal. This voltage applied across resistor generate constant current (I1). current from adjust terminal could introduce error output, since very small 20µA) compared with current very constant with line load changes, error ignored. constant current then flows through resistor sets output voltage desired level. www.acutechnology.com Rev. September 2005
Acutechnology Semiconductor Inc. fixed voltages resistor integrated inside devices.
AQ1117
AQ1117 regulates voltage that appears between output ground pins between output adjust pins. some cases, line resistances introduce errors voltage across load. obtain best load regulation precautions needed. example important minimize line resistances load, load itself should tied directly output terminal positive side directly ground terminal negative side. When adjustable regulator used, best performance obtained with positive side resistor tied directly output terminal regulator rather than near load. This will eliminate line drops from appearing effectively series with reference degrading regulation. addition ground side resistor returned near ground load provide remote ground sensing improve load regulation. capacitor (470pF) between system ground will enhance stability.
Protection Diodes
Unlike older regulators, AQ1117 family does need protection diodes between adjustment output from output input prevent over-stressing die. Internal resistors limiting internal current paths adjustment pin. Therefore, even with capacitors adjustment pin, protection diode needed ensure device safety under short circuit conditions. External diodes between input output usually needed. Only high value output capacitors used 1000uF) input instantaneously shorted ground, damage occur.
Thermal Considerations
When integrated circuit operates with appreciable current, junction temperature elevated. important quantify thermal limits order achieve acceptable performance reliability. This limit determined summing individual parts consisting series temperature rises from semiconductor junction operating environment. heat generated device junction flows through attach pad, through lead frame surrounding case material, printed circuit board, eventually ambient environment. AQ1117 regulators have internal thermal shutdown protect device from overheating. Under possible operating conditions, junction temperature AQ1117 must lower than 125°C. heatsink required depending maximum power dissipation maximum ambient temperature application. determine heatsink needed, power dissipated regulator, must calculated: (VIN-VOUT) where load current. next parameter which must calculated maximum allowable temperature rise, T(max): T(max)=TJ(max)-TA(max) where TJ(max) maximum allowable junction temperature (125°C), TA(max) maximum ambient temperature which will encountered application. Using calculated values T(max) maximum allowable value junction ambient thermal resistance (JA) calculated: JA=T(max)/ maximum allowable value found greater than junction ambient thermal resistance package used, heatsink needed since package alone will dissipate enough heat satisfy these requirements.
www.acutechnology.com
Rev. September 2005
Acutechnology Semiconductor Inc.
AQ1117
Package Dimensions SOT-89
Contact Information
Acutechnology Semiconductor Inc. 3487 McKee Suite Jose 95127
Disclaimer
information furnished Acutechnology this data sheet believed accurate reliable. However, Acutechnology assumes responsibility use. Acutechnology reserves right change circuitry specifications time without notification customer.
TEL: FAX: website:
(408) 259-2300 (408) 259-9160 www.acutechnology.com
Life Support Policy
Acutechnology Products designed authorized components life support devices systems where malfunction product reasonably expected result personal injury. Life support devices systems devices systems that intended surgical implant into body support sustain life, whose failure perform reasonably expected result significant injury user.
AcuRef trademark Acutechnology Semiconductor www.acutechnology.com Rev. September 2005

Dropout Voltage Regulator Product Specification Revision Septembe

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