AAT3223 PowerLinearNanoPower Dropout Linear Regulator ideal portable a

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AAT3223 PowerLinearNanoPower Dropout Linear Regulator ideal portable a

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250mA NanoPowerLDO Linear Regulator with Power General Description
AAT3223 PowerLinearNanoPower Dropout Linear Regulator ideal portable applications where extended battery life critical. This device features extremely quiescent current which typically 1.1µA. Dropout voltage also very low, typically 190mV 100mA. AAT3223 Enable feature, which when pulled will regulator into shutdown mode removing power from load offering extended power conservation capabilities portable battery powered applications. AAT3223 also Power (POK) feature. function monitors output voltage will alert system output falls regulation. AAT3223 output short circuit over current protection. addition, device also over temperature protection circuit, which will shutdown regulator during extended over current event events. AAT3223 available space saving 6-pin SOT23 8-pin SC70JW package. device rated over -40°C 85°C temperature range. AAT3223 similar AAT3221 with exception that offers additional Power function through pin.
AAT3223
PowerLinear
Quiescent Current Output Current Dropout: (typical) High accuracy: Current limit protection Over-Temperature protection Extremely power shutdown mode Temperature Coefficient Factory programmed output voltages Stable operation with virtually output capacitor type Power signal output Active high Enable 6-pin SOT23 8-pin SC70JW package
Applications
Cellular Phones Notebook Computers Portable Communication Devices Handheld Electronics Remote Controls Digital Cameras PDAs
Typical Application
ON/OFF VOUT 100k
AAT3223
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power Descriptions
SOT23-6 SC70JW-8
AAT3223
Symbol
Function
Input pin. recommended bypass this with capacitor Ground connection Output pin. This should decoupled with larger capacitor. connected Enable input. Active high, logic level compatible. Power output pin. This pulled ground during power failure, normally high impedance should have 100k pull-up resistor connected OUT.
Configuration
AAT3223 SC70JW-8 (Top View) AAT3223 SOT23-6 (Top View)
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power Absolute Maximum Ratings
Symbol
VENIN(MAX) IOUT TLEAD
AAT3223
(TA=25°C unless otherwise noted) Value
-0.3 -0.3 PD/(VIN-VO)
Description
Input Voltage Voltage Maximum Input Voltage Maximum Output Current Operating Junction Temperature Range Maximum Soldering Temperature leads, sec)
Units
Note: Stresses above those listed Absolute Maximum Ratings cause permanent damage device. Functional operation conditions other than operating conditions specified implied. Only Absolute Maximum rating should applied time.
Thermal Information
Symbol
Description
Thermal Resistance (SOT23-6, SC70JW-8)1 Power Dissipation (SOT23-6, SC70JW-8) 25°C)1,
Rating
Units
°C/W
Note Mounted demo board. Note Derate 6.7mW/°C above 25°C.
Recommended Operating Conditions
Symbol
Description
Input Voltage Ambient Temperature Range
Rating
(VOUT+VDO)
Units
Note calculate minimum input voltage, following equation: VIN(MIN) VOUT(MAX) VDO(MAX) long 2.5V.
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power Electrical Characteristics (VIN=VOUT(NOM)+1V, IOUT=1mA, COUT=1µF, TA=25°C unless otherwise noted)
Symbol
VOUT IOUT IQ-OFF VOUT/VOUT
AAT3223
Description
Output Voltage Tolerance Output Current Short Circuit Current Ground Current Off-Supply Current Line Regulation
Conditions
VOUT VOUT load inactive 4.0-5.5 VOUT VOUT VOUT IL=1 100mA VOUT 2.85 VOUT VOUT VOUT VOUT IOUT 100mA VOUT 2.85 VOUT VOUT
-2.0
Units
VOUT/VOUT
Load Regulation
Dropout Voltage
PSRR THYS POKTH POKHYS IPOK VPOK TPOK IEN(SINK)
Power Supply Rejection Ratio Over Temp Shutdown Threshold Over Temp Shutdown Hysteresis Output Noise Output Voltage Temp. Coefficient Trip Threshold Hysteresis Off-Current Voltage Delay
0.15 87.5 90.5
1.65 1.25 1.20 1.20 1.15 1.00
µVRMS PPM/°C 93.5
Fall
25°C 85°C VPOK=5.5V, TA=25°C IPOK=1mA VOUT Rising VIN=2.5 5.5V VIN=2.5 5.5V
VOUT
0.01
input threshold input threshold Input leakage
Note defined VOUT when VOUT nominal. Note VOUT 2.3V, 2.5V VOUT.
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power Typical Characteristics
(Unless otherwise noted, VOUT 25°C, COUT ceramic) Output Voltage Output Current
3.03 3.02 3.01
AAT3223
Output Voltage Input Voltage
40mA
Output
2.99 2.98 2.97
Output
10mA
Output (mA)
Input
Output Voltage Input Voltage
3.03
Drop-out Voltage Output Current
Drop-out
3.02
10mA 40mA
Output
3.01
2.99
Input
Output (mA)
Supply Current Input Voltage
Input (µA) with Load
1.E+01
PSRR with 10mA Load
80°C PSRR (dB) 25°C
-30°C
1.E+02
1.E+03
1.E+04
1.E+05
Input
Frequency (Hz)
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
(Unless otherwise noted, VOUT 25°C, COUT ceramic) Noise Spectrum
AAT3223
Line Response with Load
Noise µV/rt
Output Voltage
1.E+01
-200
Output
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Freque (Hz)
Time (µs)
Line Response with 10mA Load
Line Response with 100mA Load
Output Voltage
Input Voltage
-200
Output
-200
Output
Time
Time (µs)
Load Transient
Load Transient
Output
Output
Output
Time (ms)
Time (ms)
3223.2003.07.1.2
Output (mA)
Output
Output
Input Voltage
Input
Output Voltage
Input
Input Voltage
Input
250mA NanoPowerLDO Linear Regulator with Power
(Unless otherwise noted, VOUT 25°C, COUT ceramic) Power with Load Turn with Load
AAT3223
(1V/div)
(1V/div) (1V/div)
(1V/div) (1V/div)
(1V/div)
Time (ms)
Time (ms)
Power with 10mA Load
Turn with 10mA Load
(1V/div)
(1V/div) (1V/div)
(1V/div) (1V/div)
(1V/div)
Time (ms)
Power with 100mA Load
Turn with 100mA Load
(1V/div)
(1V/div) (1V/div)
(1V/div) (1V/div)
(1V/div)
Time (ms)
Time (ms)
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
(Unless otherwise noted, VOUT 25°C, COUT ceramic) Power from 100mA Load Current Limit Response
AAT3223
(1V/div) (1V/div)
(1V/div) (1V/div) IOUT (200mA/div)
-200 1000
(1V/div)
Time (µs)
Time (ms)
Threshold
1.50
Threshold
1.25
1.00
-30°C
0.75
25°C
80°C
0.50
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power Functional Block Diagram
AAT3223
Over-Current Protection
Over-Temperature Protection
Error Amplifier
VREF Delay
Voltage Reference
Functional Description
AAT3223 intended regulator applications where output current load requirements range from Load 250mA. advanced circuit design AAT3223 been optimized very quiescent ground current consumption making ideal power management systems small battery operated devices. typical quiescent current level just 1.1µA. AAT3223 also contains enable circuit, which been provided shutdown regulator additional power conservation portable products. shutdown state draws less than from input supply. Power (POK) function been incorporated allow notification application circuits when output voltage falls regulation. output voltage falls below regulation threshold limit, which compared level internal voltage reference, pulled ground through N-Channel mosfet.
3223.2003.07.1.2
also demonstrates excellent power supply ripple rejection (PSRR), load line transient response characteristics. AAT3223 truly high performance regulator especially well suited circuit applications which sensitive load circuit power consumption extended battery life. regulator output been specifically optimized function with cost, ceramic capacitors. However, design will allow operation over wide range capacitor types. AAT3223 complete short circuit thermal protection. integral combination these internal protection circuits give AAT3223 comprehensive safety system guard against extreme adverse operating conditions. Device power dissipation limited package type thermal dissipation properties. Refer thermal considerations discussion section details device operation maximum output current loads.
250mA NanoPowerLDO Linear Regulator with Power Applications Information
assure maximum possible performance obtained from AAT3223, please refer following application recommendations. total output capacitance required calculated using following formula: COUT Where: maximum step output current maximum excursion voltage that load tolerate Note that this equation results capacitor values approximately four times typical value needed AAT3223 room temperature. increased capacitor value recommended tight output tolerances must maintained over extreme operating conditions maximum operational temperature excursions. tantalum aluminum electrolytic capacitors used, capacitor value should increased compensate substantial inherent these capacitor types. 15µF
AAT3223
Input Capacitor
Typically larger capacitor recommended most applications. capacitor required basic regulator operation. However, AAT3223 physically located distance more than centimeter from input power source, capacitor will needed stable operation. should located close device practically possible. values greater than will offer superior input line transient response will assist maximizing power supply ripple rejection. Ceramic, tantalum aluminum electrolytic capacitors selected there specific capacitor requirement. 250mA regulator output operation, ceramic capacitors recommended their inherent capability over tantalum capacitors withstand input current surges from impedance sources such batteries portable devices.
Capacitor Characteristics
Ceramic composition capacitors highly recommended over other types capacitors with AAT3223. Ceramic capacitors offer many advantages over their tantalum aluminum electrolytic counterparts. ceramic capacitor typically very ESR, lower cost, smaller footprint non-polarized. Line load transient response regulator improved using ceramic capacitors. Since ceramic capacitors non-polarized, they less prone damage connected incorrectly. Equivalent Series Resistance (ESR): very important characteristic consider when selecting capacitor. internal series resistance associated with capacitor, which includes lead resistance, internal connections, capacitor size area, material composition ambient temperature. Typically capacitor measured milliohms ceramic capacitors range more than several ohms tantalum aluminum electrolytic capacitors. Ceramic Capacitor Materials: Ceramic capacitors less than 0.1µF typically made from materials. materials typically tight tolerance very stable over temperature. Larger capacitor values typically
Output Capacitor
proper load voltage regulation operational stability, capacitor required between pins VOUT GND. COUT capacitor connection regulator ground should made direct practically possible maximum device performance. AAT3223 been specifically designed function with very ceramic capacitors. Although device intended operate with these capacitors, stable over very wide range capacitor ESR, thus will also work with some higher tantalum aluminum electrolytic capacitors. However, best performance, ceramic capacitors recommended. value COUT typically ranges from 0.47µF 10µF, however sufficient most operating conditions. large output current steps required application, then increased value COUT should considered. amount capacitance needed calculated from step size change output load current expected voltage excursion that load tolerate.
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
composed X7R, X5R, dielectric materials. Large ceramic capacitors, typically greater than 2.2µF often available cost dielectrics. These material types recommended with regulators since capacitor tolerance vary more than ±50% over operating temperature range device. 2.2µF capacitor could reduced over full operating temperature range. This cause problems circuit operation stability. dielectrics much more desirable. temperature tolerance dielectric better than ±15%. Capacitor area another contributor ESR. Capacitors, which physically large size will have lower when compared smaller sized capacitor equivalent material capacitance value. These larger devices also improve circuit transient response when compared equal value capacitor smaller package size. Consult capacitor vendor data sheets carefully when selecting capacitors with regulators. output ground. There fixed delay circuit between comparator output N-Channel Mosfet gate. purpose delay prevent false triggering output during device turn during very short duration load transient events. necessary, additional flag delay added placing capacitor parallel with pull resistor. additional delay time will time constant pull resistor parallel capacitor values. When AAT3223 shutdown state with low, becomes impedance. output will discharged through high value pull-up resistor. When entering shutdown state, there delay associated with output; open-drain device turns immediately. This offers added advantage having hard application turn when regulator turned off. This additional function adverse effect regulator turn time.
AAT3223
Enable Function
AAT3223 features regulator enable disable function. This (EN) compatible with CMOS logic. logic high signal, control level must greater then volts. logic signal asserted when voltage falls below volts. example, active high version AAT3223 will turn when logic high applied pin. enable function needed specific application, tied respective voltage level keep regulator continuously state; e.g. active high version AAT3223 will remain
Short Circuit Protection Thermal Protection
AAT3223 protected both current limit over temperature protection circuitry. internal short circuit current limit designed activate when output load demand exceeds maximum rated output. short circuit condition were continually draw more than current limit threshold, regulator's output voltage will drop level necessary supply current demanded load. Under short circuit other over current operating conditions, output voltage will drop AAT3223's temperature will increase rapidly. Once regulator's power dissipation capacity been exceeded internal temperature reaches approximately 140°C system thermal protection circuit will become active. internal thermal protection circuit will actively turn regulator output pass device prevent possibility over temperature damage. regulator output will remain shutdown state until internal temperature falls back below 140°C trip point. interaction between short circuit thermal protection systems allow regulator withstand indefinite short circuit conditions without sustaining permanent damage.
Power Function
Power (POK) function very useful basic active error flag. When AAT3223 output voltage level within regulation limits, output high impedance should tied high output through high value resistor, 100k good resistor value this purpose. internal comparator reference threshold trigger nominal AAT3223 output voltage. output voltage level drops below this preset threshold, function will become active turn open drain N-channel Mosfet pull
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
No-Load Stability
AAT3223 designed maintain output voltage regulation stability under operational noload conditions. This important characteristic applications where output current drop zero. output capacitor required stability under load operating conditions. Refer output capacitor considerations section recommended typical output capacitor values. output load current were exceed 267mA ambient temperature were increase, internal temperature will increase. condition remained constant short circuit protection activate, there would potential damage hazard regulator since thermal protection circuit will only activate after short circuit event occurs regulator output. figure what maximum input voltage would given load current refer following equation. This calculation accounts total power dissipation Regulator, including that caused ground current. PD(MAX) (VIN VOUT)IOUT (VIN IGND) This formula solved determine maximum input voltage. VIN(MAX) (PD(MAX) (VOUT IOUT)) (IOUT IGND) following example AAT3223 volt output: From discussion above, PD(MAX) determined equal 667mW 25°C. VOUT volts IOUT 250mA IGND 1.1µA +1.1µA) VIN(MAX) 9.11V Thus, AAT3223 sustain constant 2.8V output 150mA load current long 9.11V ambient temperature 25°C. 5.5V maximum input operating voltage AAT3223, thus 25°C, device would have thermal concerns operational VIN(MAX) limits. This situation different 85°C. following example AAT3223 volt output 85°C: From discussion above, PD(MAX) determined equal 267mW 85°C. VOUT volts IOUT 150mA IGND 1.1µA +1.1µA) VIN(MAX) 4.58V
AAT3223
Thermal Considerations High Output Current Applications
AAT3223 designed deliver continuous output load current 250mA under normal operating conditions. limiting characteristic maximum output load safe operating area essentially package power dissipation internal preset thermal limit device. order obtain high operating currents, careful device layout circuit operating conditions need taken into account. following discussions will assume regulator mounted printed circuit board utilizing minimum recommended footprint printed circuit board 0.062inch thick material with ounce copper. given ambient temperature (TA) maximum package power dissipation determined following equation: PD(MAX) [TJ(MAX) Constants AAT3223 TJ(MAX), maximum junction temperature device which 125°C 150°C/W, package thermal resistance. Typically, maximum conditions calculated maximum operating temperature where 85°C, under normal ambient conditions 25°C. Given 85°, maximum package power dissipation 267mW. 25°C°, maximum package power dissipation 667mW. maximum continuous output current AAT3223 function package power dissipation input output voltage drop across regulator. Refer following simple equation: IOUT(MAX) PD(MAX) (VIN VOUT) example, VOUT 2.8V 25°, IOUT(MAX) 267mA. output short circuit protection threshold between 300mA 450mA.
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
Higher input output voltage differentials obtained with AAT3223, while maintaining device functions thermal safe operating area. accomplish this, device thermal resistance must reduced increasing heat sink area operating regulator duty cycled mode. example, application requires 5.0V while VOUT 2.8V 150mA load 85°C. greater than 4.58V, which maximum safe continuous input level VOUT 2.8V 150mA 85°C. maintain this high input voltage output current level, regulator must operated duty cycled mode. Refer following calculation duty cycle operation: PD(MAX) assumed 267mW IGND 1.1µA IOUT 150mA volts VOUT volts
Voltage Drop
AAT3223
Device Duty Cycle DROP VOUT 2.8V 25°C
250mA
Voltage Drop
300mA
Duty Cycle
Device Duty Cycle VDROP VOUT 2.8V 50°C
100(PD(MAX) ((VIN VOUT)IOUT (VIN IGND)) 80.9% 150mA output current volt drop across AAT3223 ambient temperature 85°C, maximum time duty cycle device would 80.9%. following family curves shows safe operating area duty cycled operation from ambient room temperature maximum operating level.
200mA
300mA 250mA
Duty Cycle
Device Duty Cycle DROP VOUT 2.8V 85°C
200mA
Voltage Drop
150mA
100mA
250mA 300mA
Duty Cycle
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
High Peak Output Current Applications
Some applications require regulator operate continuous nominal levels with short duration high current peaks. duty cycles both output current levels must taken into account. would first need calculate power dissipation nominal continuous level, then factor addition power dissipation short duration high current peaks. example, 2.8V system using AAT3223IGU2.8-T1 operates continuous 100mA load current level short 250mA current peaks. current peak occurs 378µs 4.61ms period. will assumed input voltage 5.0V. First, current duty cycle percentage must calculated: Peak Duty Cycle: X/100 378ms/4.61ms Peak Duty Cycle 8.2% Regulator will under 100mA load 91.8% 4.61ms period have 150mA peaks occurring 8.2% time. Next, continuous nominal power dissipation 100mA load should determined then multiplied duty cycle conclude actual power dissipation over time. PD(MAX) (VIN VOUT)IOUT (VIN IGND) PD(100mA) (5.0V 2.8V)100mA (5.0V 1.1µA) PD(100mA) 225.5mW PD(91.8%D/C) PD(100mA) PD(91.8%D/C) 0.918 225.5mW PD(91.8%D/C) 207mW power dissipation 100mA load occurring 91.8% duty cycle will 207mW. power dissipation remaining 8.2% duty cycle 150mA load calculated: PD(MAX) (VIN VOUT)IOUT (VIN IGND) PD(250mA) (5.0V 2.8V)250mA (5.0V 1.1µA) PD(250mA) 550mW PD(8.2%D/C) PD(250mA) PD(8.2%D/C) 0.082 550mW PD(8.2%D/C) 45.1mW power dissipation 150mA load occurring 8.2% duty cycle will 20.9mW. Finally, power dissipation levels summed determine total true power dissipation under varied load. PD(total) PD(100mA) PD(250mA) PD(total) 207mW 45.1mW PD(total) 252.1mW maximum power dissipation AAT3223 operating ambient temperature 85°C 267mW. device this example will have total power dissipation 252.1mW. This within thermal limits safe operation device.
AAT3223
Printed Circuit Board Layout Recommendations
order obtain maximum performance from AAT3223 regulator, very careful attention must considered regard printed circuit board layout. grounding connections properly made, power supply ripple rejection regulator transient response compromised. Regulator external capacitors COUT should connected directly possible ground Regulator. maximum performance with AAT3223, ground connection should then made directly back ground common source power supply. direct ground return path possible printed circuit board layout limitations, ground should then connected common ground plane application layout.
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power Ordering Information
Output Voltage 1.8V 2.7V 2.8V 2.8V 2.85V 3.0V 3.3V Enable Active high Active high Active high Active high Active high Active high Active high Package SOT23-6 SOT23-6 SOT23-6 SC70JW-8 SOT23-6 SOT23-6 SOT23-6 Marking1 EGXYY GGXYY EHXYY EHXYY GFXYY GEXYY GQXYY Part Number (Tape Reel) AAT3223IGU-1.8-T1 AAT3223IGU-2.7-T1 AAT3223IGU-2.8-T1 AAT3223IJS-2.8-T1 AAT3223IGU-2.85-T1 AAT3223IGU-3.0-T1 AAT3223IGU-3.3-T1
AAT3223
Note: Sample stock generally held part numbers listed BOLD. Note assembly date code.
Package Information
SOT23-6
2.85 0.15 1.90 0.95
1.575 0.125
1.10 0.20
2.80 0.20 1.20 0.25
0.075 0.075
0.15 0.07
GAUGE PLANE
0.40 0.10
0.60
0.45 0.15
0.10
3223.2003.07.1.2
250mA NanoPowerLDO Linear Regulator with Power
SC70JW-8
0.50 0.50 0.50
AAT3223
1.75 0.10 0.225 0.075 2.00 0.20
2.20 0.20
0.048REF 0.15 0.05
0.85 0.15
1.10
0.100
0.45 0.10 2.10 0.30
AnalogicTech cannot assume responsibility circuitry other than circuitry entirely embodied AnalogicTech product. circuit patent licenses, copyrights, mask work rights, other intellectual property rights implied. AnalogicTech reserves right make changes their products specifications discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability. AnalogicTech warrants performance semiconductor products specifications applicable time sale accordance with AnalogicTech's standard warranty. Testing other quality control techniques utilized extent AnalogicTech deems necessary support this warranty. Specific testing parameters each device necessarily performed.
Advanced Analogic Technologies, Inc.
Arques Avenue, Sunnyvale, 94085 Phone (408) 737-4600 (408) 737-4611
3223.2003.07.1.2
0.05 0.05

AAT3223 PowerLinearNanoPower Dropout Linear Regulator ideal portable a

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