LM1117-xx series low dropout linear regulator with limit output current up to 1A
The LM1117-xx series of low dropout linear voltage regulators introduced by Xinyu Semiconductor have adjustable versions and multiple fixed versions, which are designed to provide a stable 1A output current, and the working voltage difference can be as low as 1.4V. In the fixed output version, the fixed output voltage is 1.2V, 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V, 5.0V, and the accuracy is 1%. The LM1117 of Siyu Semiconductor is internally integrated with overheating protection and current limiting circuit, which is the best choice for battery powered and portable computers.
LM1117-XX typical application circuit
C1 and C2 are filter capacitors. In order to ensure the stability of LM1117, for the adjustable voltage version, the output needs to be connected to at least 22 μ F capacitance. For the fixed voltage version, smaller capacitors can be used, which can be determined according to the actual application. In general, the stability of a linear regulator decreases as the output current increases.
Main features of LM1117-XX
l The output voltage is adjustable or fixed 1.2 V, 1.5 V, 1.8 V, 2.5 V, 2.85 V, 3.0 V, 3.3 V, 3.5 V, 5 V
l Linear adjustment rate 0.1%
l Load adjustment rate 0.2%
l Current limiting circuit and over temperature protection
LM1117-XX limit parameter
parameter | Symbol | Range | Company |
Input working voltage | VIN | 20 | V |
Working junction temperature | TJ | -45 to 150 | °C |
Storage temperature | TSTG | -65 to 150 | °C |
ESD capacity (minimum) | VESD | 2 | KV |
LM1117-XX electrical parameters
Symbol | Parameter | Condition | Minimum value | Typical value | Maximum | Company |
UDS | differential pressure | Io=1A, (Tj = -45°C to +125°C.) | . | 1.25 | 1.40 | V |
IOMAX | Maximum current | Vin - Vo =1.5V | 1.0 | 1.5 | 2.0 | A |
IOMIN | Minimum load current (adjustable) | Vin = 5V, VADJ = 0V | . | 2 | 7 | mA |
ICC | Quiescent current | Vin - Vo = 1 . 5V |
| 5 | 10 | mA |
KRR | Ripple suppression ratio | f=120Hz,
Co = 10mF T ant al um,
Io=200m A,Vin-Vo= 3V | 60 | 66 | . | dB |
IADJ | ADJ pin current | Io = 10mA to 1A,
Vin = 2.75V to 10V | . | 60 | 120 | uA |
ΔIADJ | Current change of ADJ pin | Io = 10mA to 1A,
Vin = 2.75V to 10V | 2 | 5 | uA |
aVO | Temperature coefficient | Vin - V o = 1 . 5V , Io = 10mA | . | . | 0.015 | % / °C |
LM1117-XXPin diagram
Application direction：
Consumer electronics: watches, mobile phones, computers, tablets, etc;
Industrial field: industrial instruments, instruments and other equipment;
Smart home: smart door lock, smart camera, smart switch, smart curtain, smart sweeper, etc;
Intelligent transportation (ITS): electronic information card for vehicle traffic, infrared radar detector, etc.