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AMS1117CD-ADJ
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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 1A TO252
- Series：-
- Mfr：UMW
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：12V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：Current Limit
- Protection Features：Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：TO-252 (DPAK)
- Grade：-
- Qualification：-
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Overview
The AMS1117CD-ADJ is a positive low dropout linear regulator manufactured by UMW, featuring an adjustable output voltage and 1A current capability. It utilizes TO-252-2L packaging with Pin 1 as ADJ/GND, Pin 2 as VOUT, and Pin 3 as VIN. The device operates within a junction temperature range of -40°C to 125°C and supports a maximum input voltage of 18V. Key electrical parameters include a reference voltage of 1.250V typical, line regulation of 9mV typical, load regulation of 10mV typical, and ripple rejection of 60dB at 120Hz. Dropout voltage is typically 1.2V at 1A.
Feature Summary
- Adjustable output voltage configuration via external resistors
- Integrated thermal shutdown protection against excessive junction temperatures
- On-chip current limiting to minimize stress during overload conditions
Applications
- Battery chargers
- Active SCSI terminators
- Post-regulators for switching power supplies
- Portable instrumentation systems
Procurement Notes
Verify the package marking matches the TO-252-2L designation and confirm the suffix indicates the adjustable version. Ensure the supplier provides documentation confirming RoHS compliance and the specific operating temperature range of -40°C to 125°C. Cross-reference the manufacturer part number with official datasheets to validate pinout assignments and absolute maximum ratings before integration.
Selection Notes
Select this component when an adjustable output voltage is required alongside high current delivery in a compact surface-mount form factor. The TO-252-2L package offers lower thermal resistance compared to SOT-223, facilitating better heat dissipation for high-power applications. Consider the 1.2V typical dropout voltage when designing for minimal input-to-output differential scenarios.
Part Context
This device belongs to the AMS1117 series of low dropout regulators designed for efficient power management in portable electronics. The series includes both fixed voltage options and adjustable variants, providing flexibility for various system requirements. Manufactured by UMW, it maintains compatibility with standard three-terminal regulator footprints while offering enhanced thermal performance through its specific package design.
Replacement Considerations
Compatible substitutes include AMS1117CD-ADJ from other manufacturers such as AMS or ARTSCHIP, provided they adhere to identical pin configurations and electrical specifications. Verify that alternative sources offer the same TO-252-2L package and meet the 1A current and 18V input voltage limits.
FAQ
What is the typical reference voltage for the AMS1117CD-ADJ?
The typical reference voltage (VREF) is 1.250V under standard test conditions.
How does the device handle overload conditions?
It incorporates on-chip thermal shutdown and current limiting features to protect against excessive junction temperatures and overcurrent situations.
