1A Adjustable/Fixed Low Dropout Linear Regulator
- Low dropout voltage
- Load regulation: 0.2% typical - Optimized for Low V oltage - 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
- Active SCSI terminators
- High efficiency linear regulators
- Post regulators for switching supplies - Battery chargers
- 12V to 5V linear regulators - M otherboard clock supplies
The AMS 1117-ADJ and AMS 1117-1.2,-1.5,-1.8,-2.5,-2.85, -3.3 and-5 are low dropout three-terminal regulators with 1A output current capability. The devices have been optimized for low voltage where transient respon and minimum input voltage are critical. The 2.85V version is designed specifically to be ud 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 AMS 1117 flows into the load, increasing effi-ciency.
The AMS 1117 ries regulators are available in the indus-try-standard SOT-223 and TO-252 power packages.
急救方法Key Features
Applications
李白的长相思General Description
Typical Application
Notice: The distance between V out pin and Capacitor should not exceed 4cm for excellent performance
Figure 1. Typical Applications of AMS 1117
1A Adjustable/Fixed Low Dropout Linear Regulator
Pin Assignments
*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
Figure 2. Pin Assignments of AMS 1117
Parameter
Min.
Max.
Unit
V IN 18 V
(V IN – V OUT ) * I OUT
See Figure 3
Operating Junction Temperature Range -20 125
°C Storage Temperature Range
-65
150
°C Lead Temperature (Soldering, 10 c.) 300
°C
1A Adjustable/Fixed Low Dropout Linear Regulator
Typicals and limits appearing in normal type apply for T J =25℃.Limits appearing in Boldface type apply over the entire junction temperature for operation, -20℃to 125℃.
Electrical Characteristic
Block Diagram
Thermal Limit
Current Limit
V OUT
V IN
Substrate
GND (fixed output) ADJ. (adjustable output)
Figure 3. Block Diagram of AMS 1117
Symbol Parameter
Conditions
Min (Note 2) Typ (Note 1) Max
(Note 2)
Units
V REF
Reference Voltage
AMS 1117
1.5V<=(V IN -V OUT )<=7V,10mA<=I OUT <=1A
1.225 1.250 1.275 V
V OUT Output
Voltage 10mA<=
I OUT <=1A
I OUT = 10mA, V IN = 3.2V AMS 1117-1.2 ,2.7V<= V IN <=8.2V 1.176 1.152 1.200 1.200 1.224 1.248 V AMS 1117-1.5 ,3.0V<= V IN <=8.5V
1.470
1.500
1.530
V
AMS 1117-1.8 ,3.3V<= V IN <=8.8V 1.764 1.800 1.836 V
AMS 1117-2.5 ,4V<= V IN <= 9.5V 2.450 2.500 2.550 V AMS 1117-2.85 , 4.35V <= V IN <= 9.85V 2.793 2.850 2.907 V AMS 1117-3.3 , 4.8V<= V IN <=10.3V 3.234 3.300 3.366 V AMS 1117-5.0,6.5V<=V IN <= 12V
4.900
5.000
5.100
V
1A Adjustable/Fixed Low Dropout Linear Regulator
Typicals and limits appearing in normal type apply for T J =25℃.Limits appearing in Boldface type apply over the entire junction temperature for operation, -20℃ to 125℃.
Electrical Characteristic
(Continued)
Symbol
Parameter Conditions
Min (Note 2)
Typ (Note 1) Max (Note 2) Units △V OUT
Line Regultion (Note 3)
I OUT =10mA ,(V OUT +1.5V)<=V IN <=12V 0.035 0.2 % Load Regultion (Note 3) V IN -V OUT =2V,10mA<= I OUT <=1A,
0.2 0.7 % AMS 1117-1.2
V IN -V OUT =2V,10mA<= I OUT <=1A,
0.2 1 % V IN -V OUT
Dropout Volage I OUT =1A,△V REF =1% 1.100 1.250 V I Limit
Current Limit V IN -V OUT = 2V, T J =25℃
1.1 1.5
A Minimum Load Current (Note 4) AMS 1117-ADJ
婴儿吃奶
1.5V<=(V IN -V OUT )<=10V
10
mA Quiescent Curent
V IN =V OUT +1.25V 5 13 mA Thermal Regulation T A = 25°C, 30ms pul 0.01 0.1 %/W Ripple
Rejection f=120Hz,V IN -V OUT =3V, V Ripple =1V PP
60 72 dB Adjust Pin Current
50
120
µA
Adjust Pin Current
Change 1.5V<=V IN -V OUT <=7V, 10mA<=I OUT <=1A
0.2 5 µA
Temperature Stability
0.5 % Long Term Stability
T A = 125°C, 1000hrs.
0.3
%
1A Adjustable/Fixed Low Dropout Linear Regulator
Note 1: Typical Values reprent 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
Typicals and limits appearing in normal type apply for T J =25℃.Limits appearing in Boldface type apply over the entire junction temperature for operation, -20℃to 125℃.
Electrical Characteristic
(Continued)
Symbol Parameter
Conditions
钢琴排名Min (Note 2) Typ (Note 1) Max (Note 2)
Units
锋怎么读
I Limit
助纣为虐RMS Output Noi(% of
V OUT )
T A = 25°C, 10Hz<= f <=10kHz
0.003 % Thermal Resistance, Junction
to Ca
SOT-223 15 ℃/W TO-252 3 ℃/W Thermal Shutdown Junction Temperature
155 ℃ Thermal Shutdown Hysteresis
25
℃
Output Current ( A )
0 0.2 0.4 0.6 0.8 1.0
1.5 1.4 1.3 1.2 1.0 0.9 0.8 0.7 0.6 0.5 0
D r o p o u t V o l t a g e ( V )
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Figure 4. Dropout Voltage VS. Output Current我的新发现作文
