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 t
ransient 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.
述职报告模板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.
Key Features
Applications
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湖商
(Note 2)
Units
V REF
Reference Voltage
AMS 1117
1.5V<=(V IN -V OUT )<=7V,10mA<=I OUT <=1A
肝五行属什么
1.225 1.250 1.275 V
V OUT Output画饼充饥是什么意思
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<=12V0.0350.2%
Load Regultion山根低
77年属什么的
(Note 3)
V IN-V OUT=2V,10mA<= I OUT<=1A,0.20.7%
AMS1117-1.2
V IN-V OUT=2V,10mA<= I OUT<=1A,
0.21%夜抑郁
V IN-V OUT Dropout Volage I OUT=1A,△V REF=1% 1.100 1.250V
I Limit
Current Limit V IN-V OUT= 2V, T
J=25
℃ 1.1 1.5A Minimum Load
Current (Note 4)
AMS1117-ADJ
1.5V<=(V IN-V OUT)<=10V
10 mA Quiescent Curent V IN=V OUT+1.25V513mA Thermal
Regulation
T A = 25°C, 30ms pul0.010.1%/W Ripple
Rejection
f=120Hz,V IN-V OUT=3V, V Ripple=1V PP6072dB Adjust Pin Current50120µA Adjust Pin Current
Change
1.5V<=V IN-V OUT<=7V, 10mA<=I OUT<=1A0.25µA
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
Min (Note 2) Typ (Note 1) Max (Note 2)
超短诗Units
I Limit
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 )
Figure 4. Dropout Voltage VS. Output Current
