AMS11171A Adjustable/Fixed Low Dropout Linear Regulator
General Description The AMS1117-ADJ and AMS1117-1.2,-1.5,-1.8,-2.5,-2.85, -3.3 and-5 are low dropout three-terminal regulators with 1A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in Active Terminators for SCSI bus.
On-chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures.
Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent cur-rent of the AMS1117 flows into the load, increasing effi-ciency.
The AMS1117 series regulators are available in the indus- try-standard SOT-223 and TO-252 power packages.
Key Features
- Low dropout voltage
- Load regulation: 0.2% typical - Optimized for Low Voltage - On-chip thermal limiting
- Standard SOT-223 and TO-252 packages
- Three-terminal adjustable or fixed low dropout 1.2V,1.5V,1.8V, 2.5V, 2.85V, 3.3V, 5V. Regulators
Applications
- Active SCSI terminators
- High efficiency linear regulators
- Post regulators for switching supplies - Battery chargers
- 12V to 5V linear regulators - Motherboard clock supplies
Typical Application Figure 1. Typical Applications of AMS1117
Notice: The distance between Vout pin and Capacitor should not exceed 4cm for excellent performance
1Advanced Monolithic Systems http://www.ams-semitech.com
AMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Pin Assignments
Figure 2. Pin Assignments of AMS1117
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ΘJA can vary from 30°C/W to more than 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W.
Absolute Maximum Ratings
Parameter
VIN (VIN – VOUT) * IOUT
Min.
Max.
18 See Figure 3
Unit
V
°C °C °C
Operating Junction Temperature Range -20 125
Storage Temperature Range
-65
150
Lead Temperature (Soldering, 10 sec.) 300
2Advanced Monolithic Systems http://www.ams-semitech.com
AMS11171A Adjustable/Fixed Low Dropout Linear Regulator
=
Block Diagram
VIN
Thermal Limit
Current Limit
VOUT
Substrate
GND (fixed output) ADJ. (adjustable output)
Figure 3. Block Diagram of AMS1117 Electrical Characteristic
Typicals and limits appearing in normal type apply for TJ=25℃.Limits appearing in Boldface type apply over the entire junction temperature for operation, -20℃to 125℃.
Symbol Parameter
Reference Voltage
Conditions
AMS1117
1.5V<=(VIN-VOUT)<=7V,10mA<=IOUT<=1A
IOUT = 10mA, VIN = 3.2V AMS1117-1.2 ,2.7V<= VIN<=8.2V AMS1117-1.5 ,3.0V<= VIN<=8.5V
Min Typ Max
Units
(Note 2) (Note 1) (Note 2)
1.225 1.176 1.152 1.470
1.250 1.200 1.200 1.500
1.275 1.224 1.248 1.530
V
VREF
V V
AMS1117-1.8 ,3.3V<= VIN<8.8V 1.764 1.800 1.836 V 10mA<=
VOUT Output Voltage IOUT<=1A
AMS1117-2.5 ,4V<= VIN<= 9.5V AMS1117-2.85 , 4.35V <= V IN<= 9.85V AMS1117-3.3 , 4.8V<= VIN <=10.3V AMS1117-5.0,6.5V<=VIN <= 12V
2.450 2.793 3.234 4.900
2.500 2.850 3.300 5.000
2.550 2.907 3.366 5.100
V V V V
3Advanced Monolithic Systems http://www.ams-semitech.comAMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Electrical Characteristic
(Continued)
Typicals and limits appearing in normal type apply for TJ=25℃.Limits appearing in Boldface type apply over the entire junction temperature for operation, -20℃ to 125℃.
Min (Note 2)
Typ (Note 1) 0.035 0.2 0.2 1.100 1.5
Max (Note 2) 0.2 0.7 1 1.250
Symbol Parameter Line Regultion (Note 3)
Conditions
IOUT=10mA ,(VOUT+1.5V)<=VIN<=12V VIN-VOUT=2V,10mA<= IOUT<=1A,
AMS1117-1.2
VIN-VOUT=2V,10mA<= IOUT<=1A,
IOUT=1A,△VREF=1% VIN-VOUT= 2V, TJ=25℃
AMS1117-ADJ
Units % % % V A mA mA %/W dB µA
1.1 10 60
△VOUT
Load Regultion (Note 3) Dropout Volage Current Limit Minimum Load Current (Note 4) Quiescent Curent
Thermal Regulation Ripple
VIN-VOUT
1.5V<=(VIN-VOUT)<=10V
VIN=VOUT+1.25V TA = 25°C, 30ms pulse f=120Hz,VIN-VOUT=3V, VRipple=1VPP
1.5V<=VIN-VOUT<=7V, 10mA<=IOUT<=1A
5 0.01 72 50
13 0.1 120
ILimit
Rejection Adjust Pin Current Adjust Pin Current
Change Temperature Stability Long Term Stability
0.2 5 µA
TA = 125°C, 1000hrs.
0.5 0.3
% %
4Advanced Monolithic Systems http://www.ams-semitech.comAMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Electrical Characteristic
(Continued)
Typicals and limits appearing in normal type apply for TJ=25℃.Limits appearing in Boldface type apply over the entire junction temperature for operation, -20℃to 125℃.
Symbol Parameter
RMS Output Noise(% of VOUT)
Conditions
TA = 25°C, 10Hz<= f <=10kHz
SOT-223 TO-252 Junction Temperature
Min Typ Max (Note 2) (Note 1) (Note 2)
0.003 15 3 155 25
Units
% ℃/W ℃/W ℃ ℃
ILimit
Thermal Resistance, Junction
to Case
Thermal Shutdown Thermal Shutdown Hysteresis
Note 1: Typical Values represent the most likely parametric norm. Note 2: All limits are guaranteed by testing or statistical analysis.
Note 3: Load and line regulation are measured at constant junction room temperature. Note 4: The minimum output current required to maintain regulation.
Typical Performance Characteristics 1.5 1.4 Dropout Voltage ( V )
1.3 1.2 1.0 0.9 0.8 0.7 0.6 0.5 0
0 0.2 0.4 0.6 0.8 1.0
Output Current ( A )
Figure 4. Dropout Voltage VS. Output Current
5Advanced Monolithic Systems http://www.ams-semitech.com
AMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Typical Performance Characteristics
0.260 1.255 ReferenceVoltage( V )Output Voltage( V )
1.250 1.245 1.240 1.235 1.225 1.220 1.215 1.210
-75 –50 –25 0 25 50 75 100 125 150 175
Junction Temperature ( ℃ )
Figure 5. Reference Voltage VS. Temperature
(Continued)
3.70 3.65 3.60
3.55
3.50 3.45 3.40 3.35 3.30 3.25
3.20
-75 –50 –25 0 25 50 75 100 125 150 175
Junction Temperature ( ℃ )
Figure 6. Output Voltage VS. Temperature
5 Minimum Load Current( mA )
4 3 2 1
0
-75 –50 –25 0 25 50 75 100 125 150 175
Junction Temperature ( ℃ ) Figure 7. Minimum Load Current VS. Temperature
100 90 ADJ Pin Current( µA ) 80
70
60 50 40 30 20 10 0
-75 –50 –25 0 25 50 75 100 125 150 175
Junction Temperature ( ℃ ) Figure 8. ADJ Pin Current VS. Temperature
Note:
AMS1117 Only
6Advanced Monolithic Systems http://www.ams-semitech.comAMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Mechanical Dimensions
4-Lead SOT-223 Package
Symbol
A A1 B c D E e F H I J K L
Inches Min.
Ñ Ñ .025 Ñ .248 .130 .115 .033 .264 .0121 Ñ 10° .0008 10° .010
Max.
.071 .181 .033 0.90 .264 .148 .124 .041 .287 Ñ 10° 16° .0040 16° .014
Millimeters Min. Max.
Ñ Ñ .064 Ñ 6.30 3.30 2.95 .840 6.71 .310 Ñ 10° .0203 10° .250
1.80 4.80 .840 2.29 6.71 3.71 3.15 1.04 7.29 Ñ 10° 16° .1018 16° .360
Notes
M N
Figure 9. 4-Lead SOT-223 Package
7Advanced Monolithic Systems http://www.ams-semitech.com
AMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Mechanical Dimensions
3-Lead TO-252 Package
(Continued)
Inches
Symbol
Min. Max.
A b b2 b3 c c2 D E e H L L1 L3 L4
.086 .025 .030 .205 .018 .018 .210 .250 .370 .055 .035 .025
.094 .035 .045 .215 .024 .023 .245 .265 .410 .070 .080 .040
Millimeters Min. Max.
2.19 0.64 0.76 5.12 0.46 0.46 5.33 6.35 9.40 1.40 0.89 0.64
2.39 0.89 1.14 5.46 0.61 0.58 6.22 6.73 10.41 1.78 2.03 1.02
Notes:
Notes
4 1
1
1. Dimensions are exclusive of mold flash, metal burrs
or interlead protrusion.
2. Stand off-height is measured from lead tip with ref. to
Datum –B-.
3. Foot length is measured with ref. to Datum –A– with
lead surface. 4. Thermal pad contour optional within dimension b3 and L3.
5. Formed leads to be planar with respect to one another
at seating place –C-. 6. Dimensions and tolerances.
.090 BSC 2.29 BSC
3 4
.108 REF 2.74 REF
Figure 10. 3-Lead TO-252 Package
8Advanced Monolithic Systems http://www.ams-semitech.com111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
AMS11171A Adjustable/Fixed Low Dropout Linear Regulator
Ordering Information Package Temperature Range Part Number Output Voltage Packing Marking Transport Media
－２０℃ - +125℃ AMS1117-1.2 1.2V AMS1117 1.2 2.5K Tape and Reel －２０℃ - +125℃ AMS1117-1.5 1.5V AMS1117 1.5 2.5K Tape and Reel -20℃ - +125℃ AMS1117-1.8 1.8V AMS1117 1.8 2.5K Tape and Reel
SOT－223
-20℃ - +125℃ AMS1117-2.5 2.5V AMS1117 2.5 2.5K Tape and Reel -20℃ - +125℃ AMS1117-2.85 2.85V AMS1117 2.8 2.5K Tape and Reel -20℃ - +125℃ AMS1117-3.3 3.3V AMS1117 3.3 2.5K Tape and Reel -20℃ - +125℃ AMS1117-5 5V AMS1117 5 2.5K Tape and Reel -20℃ - +125℃ AMS1117 Adjust AMS1117 2.5K Tape and Reel -20℃ - +125℃ AMS1117-1.2 1.2V AMS1117 1.2 2.5K Tape and Reel -20℃ - +125℃ AMS1117-1.5 1.5V AMS1117 1.5 2.5K Tape and Reel -20℃ - +125℃ AMS1117-1.8 1.8V AMS1117 1.8 2.5K Tape and Reel
TO－252
-20℃ - +125℃ AMS1117-2.5 2.5V AMS1117 2.5 2.5K Tape and Reel -20℃ - +125℃ AMS1117-2.85 2.85V AMS1117 2.8 2.5K Tape and Reel -20℃ - +125℃ AMS1117-3.3 3.3V AMS1117 3.3 2.5K Tape and Reel -20℃ - +125℃ AMS1117-5 5.0V AMS1117 5 2.5K Tape and Reel -20℃ - +125℃ AMS1117CD Adjust AMS1117CD 2.5K Tape and Reel
Advanced Monolithic Systems http://www.ams-semitech.com
Disclaimer:
• AMS reserves the right to make changes to the information herein for the improvement of the design and performance
without further notice! Customers should obtain the latest relevant information before placing orders and should verify that such information is complete and current.
in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such AMS products could cause loss of body injury or damage to property.
• AMS will supply the best possible product for customers!
• All semiconductor products malfunction or fail with some probability under special conditions. When using AMS products
The \" \" logo is a registered trademark of Advanced Monolithic Systems.
All other company and product names are trademarks of their respective owners 9Advanced Monolithic Systems http://www.ams-semitech.com
因篇幅问题不能全部显示，请点此查看更多更全内容