Dropout Positive Adjustable Fixed-Mode Regulator Features 1.4V ma

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Dropout Positive Adjustable Fixed-Mode Regulator Features 1.4V ma

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AP1084
Dropout Positive Adjustable Fixed-Mode Regulator Features
1.4V maximum dropout full load current Built-in thermal shutdown Output current limiting Adjustable output voltage fixed 1.5V,1.8V, 2.5V, 3.3V, 5.0V Fast transient response Good noise rejection Package TO252, TO263, TO220
General Description
AP1084 dropout positive adjustable fixedmode regulator with minimum 5.0A output current capability. product specifically designed provide well-regulated supply voltage applications such high-speed termination current 3.3V logic supply. AP1084 also well suited other applications such cards. AP1084 guaranteed have lower than 1.4V dropout full load current making ideal provide well-regulated outputs 1.25 3.3V with input supply.
Ordering Information
AP1084
Dropout Regulator Package TO252-3L TO263-3L TO220-3L
Vout Blank 1.5V 1.8V 2.5V 3.3V 5.0V Packing Blank Tube Taping
Typical Circuit
5.0V 3.3V Fixed Mode Regulator
100uF
Adjustable Regulator
100uF
Vout
3.3V/5A 100uF
Vout
2.5V/5A
Vout
100uF
Vout
This datasheet contains product information. Anachip Corp. reserves rights modify product specification without notice. liability assumed result this product. rights under patent accompany sale product. Rev.A4 Oct. 2003 1/10
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator Block Diagram
Vout
CURRENT LIMIT Thermal Shutdown 1.25V
Connection Diagram
TO263 FRONT VIEW TO252 FRONT VIEW Vout Vout (GND) Vout TO220 FRONT VIEW Vout (GND) Vout (GND)
Vout
Descriptions
NAME (GND) FUNCTION Adjustable (Ground only fixed mode) output regulator. minimum 10uF capacitor must connected from this ground insure stability. input regulator. Typically large storage capacitor connected from this ground insure that input voltage does below minimum dropout voltage during load transient response. This must always 1.4V higher than Vout order device regulate properly.
Vout
Anachip Corp. www.anachip.com.tw 2/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator Absolute Maximum Ratings
Symbol Supply Voltage Power Dissipation Storage Temperature Operating Junction Temperature Range Parameter Rating -0.3 Internally Limited +150 +150 Unit
Electrical Characteristics
SYM.
VREF
(Under Operating Conditions) CONDITIONS (Notes)
1.225
PARAMETER
Reference Voltage AP1084-XXX AP1084-1.5
1.250
1.275
UNIT
Io=10mA, Tj=25oC, (Vin-Vout)=1.5V IO=10mA, VOUT+1.5V<VIN<12V, =25oC IOUT 10mA, 25oC, 3VVIN12V IOUT 10mA, 25oC, 3.3VVIN12V IOUT 10mA, 25oC, 4VVIN12V IOUT 10mA, 25oC, 4.8VVIN12V IOUT 10mA, 25oC, 6.5VVIN12V VIN=3.3V, 0mA<Io<5A, =25oC (Note 1,2) VIN=3V, 0mA<Io<5A, =25oC (Note 1,2) VIN=3.3V, 0mA<Io<5A (Note 1,2) VIN=4V, 0mA<Io<5A =25oC (Note 1,2) 0mA<Io<5A TJ=25oC (Note 1,2) 0mA<Io<5A, TJ=25oC (Note 1,2) Io=5.0A (Vout Vout) Vin-Vout=5V
1.470 1.764 2.450 3.235 4.900
1.500 1.800 2.500 3.300 5.000
1.530 1.836 2.550 3.365 5.100
Line Regulation
AP1084-1.8 AP1084-2.5 AP1084-3.3 AP1084-5.0 AP1084-Adj AP1084-1.5
Load Regulation
AP1084-1.8 AP1084-2.5 AP1084-3.3 AP1084-5.0
Dropout Voltage Current Limit Minimum Load Current
Anachip Corp. www.anachip.com.tw 3/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator
Temperature Stability Io=10mA 0.65/2.7
Thermal Resistance TO-252 Junction-to-Ambient TO-263 heat sink flow) TO-220 Thermal Resistance Junction-to-Case TO-252: Control Circuitry/Power Transistor TO-263: Control Circuitry/Power Transistor TO-220: Control Circuitry/Power Transistor
Note thermal regulation specifications changes output voltage heating effects. Line load regulation measured constant junction temperature duty cycle pulse testing. Load regulation measured output lead 1/18" from package. Note 2:Line load regulation guaranteed maximum power dissipation 15W. Power dissipation determined difference between input output output current. Guaranteed maximum power dissipation will available over full input/output range.
Functional Description
Introduction AP1084 adjustable Dropout (LDO) regulator terminal device that easily programmed with addition external resistors voltages within range 1.25 AP1084 only needs 1.4V differential between Vout maintain output regulation. addition, output voltage tolerances also extremely tight they include transient response part specification. example, Intel specification calls total 100mV including initial tolerance, load regulation 5.0A load step. AP1084 specifically designed meet fast current transient needs well providing accurate initial voltage, reducing overall system cost with need fewer output capacitors. Output Voltage Setting AP1084 programmed voltages range 1.25V with addition external resistors according following formula:
Vout Vref R2/R1) +Iadj where Vref 1.25 typically, Iadj 55uA typically R1&R2 shown below
AP1084
Vref Iadj=55uA
Vout
AP1084 keeps constant 1.25V between output adjust pin. placing resistor across these pins constant current flows through adding Iadj current into resistor producing voltage equal (1.25/R1)*R2+Iadj*R2 which will added 1.25V output voltage. This summarized above equation. Since minimum load current requirement AP1084 10mA, typically selected resistor that automatically satisfies minimum current requirement. Notice that since Iadj typically range 55uA only adds small error output voltage should only considered when very precise output voltage setting required. example, typical 3.3V application where R1=121 R2=200 error Iadj only 0.3% nominal point.
Anachip Corp. www.anachip.com.tw 4/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator
Load Regulation Since AP1084 only terminal device, possible provide true remote sensing output voltage load. best load regulation achieved when bottom side connected load top-side resistor connected directly case Vout regulator load. important note that high current applications, this re-present significant percentage overall load regulation must keep path from regulator load short possible minimize this effect. Stability AP1084 requires output capacitor part frequency compensation order make regulator stable. most applications minimum 10uF aluminum electrolytic capacitor insures both stability good transient response. Thermal Design AP1084 incorporates internal thermal shutdown that protects device when junction temperature exceeds maximum allowable junction temperature. Although this device operate with junction temperatures range 150oC, recommended that selected heat sink chosen such that during maximum continuous load operation junction temperature kept below temperature. Layout Consideration output capacitors must located close Vout terminal device possible. recommended section layer board plane connect Vout output capacitors prevent high frequency oscillation that result excessive trace inductance.
Anachip Corp. www.anachip.com.tw 5/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator Performance Characteristics
0.20
Output Voltage Deviation
load=1.5A
Dropout Voltage
-0.20
-0.40
-0.80
Dropout Voltage Output Current
Output Current
Load Regulation Temperature
Temperature (oC)
Output Voltage Change
-0.5 -1.5
Output Voltage Deviation
Percent Change Output Voltage Temperature
Output Voltage Deviation (mV) Input Voltage Load Current Output Voltage Deviation (mV) Cin=1uF Cout=10uF Tantalum
Temperature (oC)
Line Regulation
Cin=1uF Cout=10uF Tantalum Preload=100mA
Input Voltage
TIME (us)
Line Transient Response
Anachip Corp. www.anachip.com.tw 6/10
Load Transient Response
TIME (us)
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator Marking Information
View) Logo
Part Number 1084 84-VV 1.5V 1.8V 2.5V 3.3V
84-VV YYWWX
Year week Internal code Optional)
(TO252-3L)
View) Logo
Part Number 1.5V 1.8V 2.5V 3.3V Blank
1084-VV YYWWX
Year week Internal code Optional)
(TO220-3L TO263-3L)
Anachip Corp. www.anachip.com.tw 7/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator Package Dimension
TO263-3L
Symbol
Dimensions Millimeters Min. Nom. Max. 4.06 4.45 4.83 0.51 0.75 0.99 1.14 1.27 1.40 3.81 TYP. 1.14 1.27 1.40 8.65 9.15 9.65 9.65 9.97 10.29 2.54 BSC. 14.61 15.24 15.88 2.28 2.54 2.80 2.92 1.27 1.52 1.78
Dimensions Inches Min. Nom. Max. 0.160 0.175 0.190 0.020 0.030 0.039 0.045 0.050 0.055 0.015 TYP. 0.045 0.050 0.055 0.341 0.380 0.575 0.090 0.050 0.360 0.393 0.100 BSC. 0.600 0.100 0.060 0.380 0.405 0.625 0.110 0.115 0.070
Anachip Corp. www.anachip.com.tw 8/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator
TO252-3L
SEATING PLANE
NOTE2
Notes:
JEDEC Outline: TO-252 Mils suggested positive contact mounting.
Symbol
Dimensions Millimeters Min. Nom. Max. 2.18 2.29 2.39 1.02 1.15 1.27 0.61 TYP. 5.20 5.35 5.50 0.46 0.52 0.58 0.46 0.52 0.58 5.33 5.57 5.80 6.35 6.58 6.80 2.25 BSC. 4.50 BSC. 9.00 9.70 10.40 0.51 0.64 0.83 1.02 1.52 1.78 2.03
Dimensions Inches Min. Nom. Max. 0.086 0.090 0.094 0.040 0.045 0.050 0.024 TYP. 0.205 0.211 0.217 0.018 0.020 0.023 0.018 0.020 0.023 0.210 0.219 0.228 0.250 0.259 0.268 0.089 BSC. 0.177 BSC. 0.354 0.382 0.409 0.020 0.025 0.033 0.040 0.060 0.070 0.080
Anachip Corp. www.anachip.com.tw 9/10
Rev. Oct. 2003
AP1084
Dropout Positive Adjustable Fixed-Mode Regulator
TO220-3L
Symbol
Anachip Corp. www.anachip.com.tw
Dimensions Millimeters Min. Nom. Max. 3.55 4.20 4.85 1.14 1.46 1.78 0.51 0.83 1.14 0.31 0.72 1.14 14.20 15.35 16.50 9.70 10.20 10.70 2.29 2.54 2.79 4.83 5.08 5.33 0.51 0.95 1.40 5.84 6.35 6.86 2.03 2.48 2.92 12.72 13.72 14.72 3.66 5.00 6.35 3.53 3.81 4.09 2.54 2.98 3.43
Dimensions Inches Min. Nom. Max. 0.140 0.165 0.191 0.045 0.057 0.070 0.020 0.033 0.045 0.012 0.028 0.045 0.559 0.604 0.650 0.382 0.402 0.421 0.090 0.100 0.110 0.190 0.200 0.210 0.020 0.037 0.055 0.230 0.250 0.270 0.080 0.098 0.115 0.501 0.540 0.580 0.144 0.197 0.250 0.139 0.150 0.161 0.100 0.117 0.135
SEATING PLANE
Rev. Oct. 2003 10/10

Dropout Positive Adjustable Fixed-Mode Regulator Features 1.4V ma

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