JW5110
Low dropout regulator with 1A output and 300mV dropout for post-regulation applications
Product Overview
Description
The JW5110 is a low-dropout regulator designed for post-regulation applications. It delivers up to 1A output current with a low 300mV dropout voltage at full load. The device is ideal for generating clean supply rails after switching converters.
The LDO operates from 2.5V to 6V input and provides fixed output voltages from 1.2V to 5V. The device features good PSRR (60dB at 1kHz) and fast transient response. The low quiescent current of 80μA makes it suitable for always-on applications.
The JW5110 includes current limit protection, thermal shutdown, and reverse polarity protection. The device is stable with ceramic output capacitors as small as 1μF. Available in SOT-223 and TO-252 packages for different thermal requirements.
Product Series
JW
Primary Application
Post-regulation
Key Features
- 1A maximum output current
- Low 300mV dropout voltage
- Good 60dB PSRR
- Low 80μA quiescent current
- Stable with 1μF ceramic capacitor
- Current limit protection
- Thermal shutdown
- Multiple package options
Specifications
| Input Voltage Range | 2.5V - 6V |
|---|---|
| Output Voltage | 1.2V - 5V (fixed) |
| Output Current | 1A max |
| Dropout Voltage | 300mV @ 1A |
| PSRR | 60dB @ 1kHz |
| Quiescent Current | 80μA |
| Load Regulation | ±1% |
| Operating Temperature | -40°C to +125°C |
| Package | SOT-223, TO-252 |
Applications
Post-regulation
Power conversion and supply
Switching supply cleanup
Electronic system design
Battery-powered systems
Battery and charging management
Industrial control
Industrial automation and control
Consumer electronics
Consumer electronics
FAE Expert Insights
"The JW5110 is a solid workhorse LDO for post-regulation applications. The 1A capability with 300mV dropout is a good balance for many applications. I frequently use it after buck converters to clean up the output and provide a quiet rail for sensitive circuits. The 60dB PSRR is adequate for most digital and mixed-signal applications, though for highly sensitive analog you might want the JW5220. One advantage of the JW5110 is stability with small output capacitors - it works fine with just 1μF, which saves cost and board space. The SOT-223 package handles 1A with reasonable copper area, while the TO-252 can do it with minimal copper. One design tip: if you're using it for post-regulation after a switching converter, place it close to the load rather than the converter to minimize noise pickup on the traces. The 80μA quiescent current is reasonable for always-on applications. Overall, a reliable and cost-effective LDO for general-purpose applications."
1A LDO with low dropout for post-regulation and general-purpose applications
— Thomas Lee, BeiLuo
Frequently Asked Questions
What is the dropout voltage of JW5110?
The JW5110 has a dropout voltage of 300mV at the maximum 1A output current. This low dropout allows efficient post-regulation even with small input-output voltage differentials. For lighter loads, the dropout voltage is proportionally lower (approximately 300mV × IOUT/1A).
300mV dropout at 1A; lower at lighter loads; suitable for post-regulation with small headroom.
What is the minimum output capacitor for JW5110?
The JW5110 is stable with ceramic output capacitors as small as 1μF. This is an advantage for cost-sensitive and space-constrained applications. However, for best transient response and PSRR, a 2.2μF or larger capacitor is recommended. Use X5R or X7R dielectric for stable capacitance across temperature.
Stable with 1μF minimum; 2.2μF or larger recommended for best performance.
What is the quiescent current of JW5110?
The JW5110 has a quiescent current of 80μA typical. This relatively low quiescent current makes it suitable for always-on applications and battery-powered systems where standby power consumption is a concern.
80μA quiescent current suitable for always-on and battery-powered applications.
What packages are available for JW5110?
The JW5110 is available in SOT-223 and TO-252 (DPAK) packages. The SOT-223 is compact and suitable for applications up to 500-600mA with adequate PCB copper. The TO-252 has better thermal performance and can handle the full 1A current with minimal additional heatsinking.
SOT-223 for compact designs <600mA; TO-252 for full 1A capability.
Is JW5110 suitable for post-regulation after a buck converter?
Yes, the JW5110 is ideal for post-regulation after switching converters. The 60dB PSRR provides good rejection of switching noise, and the low dropout allows efficient operation even with small voltage headroom. Use it to create clean supply rails for sensitive circuits while the switching converter handles the main power conversion efficiently.
Excellent for post-regulation; provides clean rails with good switching noise rejection.
What is the PSRR of JW5110?
The JW5110 provides 60dB PSRR at 1kHz, which is good for general-purpose applications. This level of power supply rejection is adequate for most digital and mixed-signal circuits. For highly noise-sensitive analog applications, consider the JW5220 which offers 70dB PSRR.
60dB PSRR good for general applications; use JW5220 for highly sensitive analog circuits.
What protection features does JW5110 have?
The JW5110 includes current limit protection to prevent damage during output short circuits, thermal shutdown to protect the device from overheating, and reverse polarity protection to prevent damage if the input voltage is connected backwards. These protections ensure reliable operation under various fault conditions.
Current limit, thermal shutdown, and reverse polarity protection included.