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TLV1117LV33DCYR

1A LDO, 3.3V, 300mV dropout, SOT-223

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Manufacturer Part：

TLV1117LV33DCYR

Package：

SOT-223 (6.50 x 3.50 x 1.60 mm)

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Description

Product Overview

The TLV1117LV33DCYR from Texas Instruments is a 1A LDO regulator with 3.3V fixed output, 300mV dropout, and 500uA IQ in SOT-223.

Key Specifications

Output Voltage 3.3V fixed
Output Current 1A
Dropout Voltage 300 mV max @ 1A
Input Voltage 2.0V to 5.5V
IQ 500 uA typical
PSRR 68 dB @ 120Hz
Output Cap 10uF ceramic min
Package SOT-223 (DCY)
Operating Temperature -40 to +125 C (TJ)

Features

  • 1A output with 300mV dropout
  • 500uA low quiescent current
  • Stable with 10uF ceramic output cap
  • Internal current and thermal limiting
  • Drop-in compatible with AMS1117

Applications

  • Post-regulation after switching supply
  • 3.3V rail from 5V USB
  • Battery-powered systems
  • FPGA/MCU I/O power

The TLV1117LV33DCYR from Texas Instruments is a 1A low-dropout linear regulator with 3.3V fixed output in SOT-223 package. The 300mV maximum dropout at full load enables efficient 5V-to-3.3V conversion. The 500uA quiescent current is significantly lower than legacy 1117 devices (5-10mA), reducing power waste in always-on applications. The device is stable with just 10uF ceramic output capacitance. Pin-compatible with AMS1117 and other standard 1117 LDOs, enabling easy upgrades.

The TLV1117LV33DCYR operates as a low-dropout linear regulator. (1) The PNP pass transistor provides the low 300mV dropout characteristic at 1A. The error amplifier compares the output voltage with an internal bandgap reference and adjusts the pass transistor drive to maintain regulation. The +/-1.5% output accuracy ensures reliable 3.3V logic levels. (2) The 500uA quiescent current is a major improvement over legacy 1117 devices that draw 5-10mA. This reduces power dissipation in battery-powered and always-on applications. The quiescent current is relatively constant across load, simplifying thermal design. (3) The device is stable with just 10uF ceramic output capacitance, eliminating the need for expensive tantalum capacitors. Internal current limiting protects against overload (1.5A typical), and thermal shutdown activates at 165C. The SOT-223 package provides a good thermal path with 15C/W junction-to-case thermal resistance.

Pin Name Function
1 GND/ADJ Ground (fixed version)
2 VOUT 3.3V regulated output
3 VIN Input supply (2.0-5.5V)
4 VOUT Output (tab, thermal)
  • 5V USB to 3.3V LDO with 300mV dropout at 1A
  • Post-regulation after switching supply with 68dB PSRR
  • Battery-powered 3.3V systems with 500uA IQ
  • FPGA/MCU I/O power with 10uF ceramic cap stability
Model Manufacturer Key Difference
TLV1117LV50DCYR TI 5.0V output version
AMS1117-3.3 Advanced 5mA IQ, higher dropout
MC33275DT-3.3RKG onsemi 300mA, 260mV dropout
NCP1117DT33RKG onsemi 1A, 1.3V dropout, DPAK
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Service & Packaging

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Contact Information

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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