AMS1117-ADJ

Part: AMS1117

Type: 1A LDO Voltage Regulator

Description: The AMS1117 is a positive low voltage dropout regulator with a typical dropout of 1.2V at 1A, offering fixed output voltages (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V) and an adjustable version, with 1.5% output accuracy for most fixed versions.

Operating Conditions:

• Supply voltage: 3.0–12 V
• Operating temperature: -40 to +125 °C (Junction)
• Max output current: 1 A

Absolute Maximum Ratings:

• Max supply voltage: 18 V
• Max continuous current: 1 A
• Max junction/storage temperature: 150 °C (Junction), -65 to +150 °C (Storage)

Key Specs:

• Reference Voltage (AMS1117-ADJ): Typ 1.250 V (I OUT =10mA, V IN -V OUT =2V, T J =25 °C)
• Dropout Voltage: Typ 1.20 V (I OUT =1A)
• Quiescent Current: Typ 5 mA, Max 10 mA (4.25V≤V IN ≤ 6.5V)
• Line Regulation: Typ 9 mV, Max 18 mV (V INMIN ≤V IN ≤ 12V, I OUT =10mA)
• Load Regulation: Typ 10 mV, Max 18 mV (10mA≤ IOUT ≤1A)
• Ripple Rejection: Typ 75 dB (f RIPPLE =120Hz, (V IN -V OUT )=3V, V RIPPLE =1V PP)
• Current Limiting: Min 2.1 A, Max 2.5 A
• Output Voltage Accuracy: 1.5% (for fixed versions 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V and adjustable version)

Features:

• 1.5% output accuracy for fixed versions 1.2V, 1.5V, 1.8V 2.5V, 3.3V, 5.0V and adjustable version
• Adjustable output voltage
• Low Dropout Voltage: Typical 1.2V@1A
• Current Limiting
• Thermal Shutdown
• Temperature Range: -40 °C to 125 °C

Applications:

• Laptop, Palmtop, and Notebook Computers
• Battery Charger
• SCSI-II Active Terminator
• Cellular Phone
• Cordless Telephones
• Battery Powered Systems
• Portable Instrumentation
• SMPS Post-Regulator

Package:

• TO-252-2L
• SOT-89-3L
• SOT-223-3L

• 1.5% output accuracy for fixed versions 1.2V,1.5V, 1.8V 2.5V, 3.3V, 5.0V and adjustable version
• Adjustable output voltage
• Low Dropout Voltage: Typical 1.2V@1A
• Current Limiting
• Thermal Shutdown
• Temperature Range: -40 C to 125 C

• Laptop, Palmtop, and Notebook Computers
• Battery Charger
• SCSI-II Active Terminator
• Cellular Phone
• Cordless Telephones
• Battery Powered Systems
• Portable Instrumentation
• SMPS Post-Regulator

AMS1117-5.0 Pinout

Package: SOT-223

Notes

• AMS1117-5.0 is a fixed 5.0V output linear regulator in SOT-223 package.
• Pin 1 serves as Ground in fixed-output mode; in adjustable configurations, it connects to the adjustment resistor network.
• Pin 2 (VOUT) is the regulated 5.0V output.
• Pin 3 (VIN) is the unregulated input supply (typically 6.5V–15V for 5.0V output).
• SOT-223 packages typically have a large exposed pad on the back; consult the mechanical drawing for thermal pad connection (often tied to GND or VOUT depending on application).

Note1: The maximum allowable power dissipation is a function of maximum operating junction temperature, TJ (max), the junction to ambient thermal resistance, Rja, and the ambient temperature Tamb. The maximum allowable power dissipation at any ambient temperature is given: PD (max) = (TJ (max) - Tamb)/ Rja, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal shutdown. The junction to ambient thermal resistance, θJA of some packages may be different, The value of θJA depends on mounting technique.

Figure 1. Typical Fixed Output Voltage

Figure 2. Typical Adjustable Output Voltage

Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test.