The GS-R405S by STMicroelectronics is a powerful voltage regulator designed for devices that need stable power. It changes a wide range of input voltages into a steady 5.1V output, useful for many tech applications. This regulator is packed with features that help it run smoothly and protect it from damage, making it a reliable choice for tough environments.
Catalog
The GS-R405S is a high-efficiency step-down (buck) switching voltage regulator module from STMicroelectronics, designed to convert DC input voltages ranging from 9V to 46V into a stable 5.1V DC output with ±2% accuracy. It delivers up to 4A of output current, making it suitable for high-current applications. The module features a soft start function to minimize inrush current during power-up, remote logic inhibit/enable for external control, and remote output voltage sensing to compensate for voltage drops across connections. Protection mechanisms include non-latching overload and short circuit protection, as well as crowbar output overvoltage protection. The integral heatsink enhances power handling capabilities and provides effective shielding to minimize electromagnetic interference (EMI). With a mean time between failures (MTBF) exceeding 200,000 hours, the GS-R405S ensures reliable performance in demanding environments.
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• Input Voltage Range: 9V to 46V
• Output Voltage: 5.1V
• Maximum Output Current: 4A
• Efficiency: Approximately 70%
• Soft Start Function: Ensures controlled ramp-up of output voltage during startup
• Non-Latching Short Circuit Protection: Protects the regulator and connected devices in case of a short circuit
• Crowbar Output Overvoltage Protection: Safeguards against excessive output voltage
• Remote Logic Inhibit/Enable: Allows external control to enable or disable the regulator
• Integral Heatsink: Enhances power handling capability and provides effective EMI shielding
• Mean Time Between Failures (MTBF): Exceeds 200,000 hours, indicating high reliability
Absolute Maximum Ratings
Symbol
|
Parameter
|
Value
|
Unit
|
Vi
|
DC Input Voltage
|
48
|
V
|
Ir*
|
Reset Output Sink Current
|
20
|
mA
|
Tstg
|
Storage Temperature Range
|
-40 to +105
|
°C
|
Tcop
|
Operating Case Temperature Range
|
-20 to +85
|
°C
|
ELECTRICAL CHARACTERISTICS
Symbol
|
Parameter
|
Test Conditions
|
Min
|
Typ
|
Max
|
Unit
|
ΔVo/ΔT
|
Temperature Stability
|
Vi = Vo+8V Io = 1A
|
-
|
0.2/1.6
|
-
|
mV/°C
|
Io
|
Output Current
|
Vi = Vo+8V
|
0.2
|
-
|
4
|
A
|
IoL
|
Current Limit
|
Vi = Vo+8V
|
-
|
5
|
8
|
A
|
Iisc
|
Average Input Current
|
Vi = 46V Output Shorted
|
-
|
0.1
|
0.2
|
A
|
fs
|
Switching Frequency
|
Io = 1A
|
-
|
100
|
-
|
KHz
|
SVR
|
Supply Voltage Rejection
|
fo = 100Hz Io = 1A
|
-
|
4/12
|
-
|
mV/V
|
Vr
|
Ripple Voltage
|
Io = 2A
|
-
|
25/150
|
-
|
mVpp
|
tss
|
Soft Start Time
|
Vi = Vo+8V
|
-
|
10/35
|
-
|
ms
|
VinhL
|
Low Inhibit Voltage
|
-
|
-
|
-
|
0.8
|
V
|
Vinhh
|
High Inhibit Voltage
|
-
|
2
|
-
|
5.5
|
V
|
Iinhh
|
High Inhibit Input Current
|
Vinh = 5V
|
-
|
-
|
500
|
µA
|
tcb
|
Crow-bar Delay Time
|
-
|
-
|
5
|
-
|
µs
|
Vrh*
|
Reset High Level
|
-
|
-
|
5
|
-
|
V
|
Vrl*
|
Reset Low Level
|
Irl = 5mA Irl = 10mA
|
-
|
-
|
0.2
0.04
|
V
|
trd*
|
Reset Delay Time
|
-
|
-
|
100
|
-
|
ms
|
Vcth
|
Crowbar Intervention Threshold
|
-
|
-
|
Vo*1.25
|
-
|
V
|
ΔVo
|
Total Remote Sense Compensation
|
-
|
-
|
-
|
500
|
mV
|
Rth
|
Thermal Resistance
|
Case to ambient
|
-
|
5
|
-
|
°C/W
|
- LM2596
- MP2307
Information Technology Equipment (ITE)
Suitable for commercial applications requiring efficient voltage regulation.
On-Card Regulation
Provides localized voltage regulation directly on circuit boards, ensuring stable power supply to specific components.
Central Power Supply Systems
Can be utilized in centralized power architectures to step down voltage levels for different subsystems.
Advantages
High Efficiency: The GS-R405S offers efficient voltage conversion, minimizing energy loss during operation.
Wide Input Voltage Range: It accommodates a broad input voltage range from 9V to 46V, providing flexibility for various applications.
High Output Current: Capable of delivering up to 4A of output current, it supports power-demanding devices.
Integrated Protection Features: The regulator includes built-in protections such as soft start, remote logic inhibit/enable, remote output voltage sense, non-latching overload and short circuit protection, and crow-bar output overvoltage protection, enhancing system reliability.
Disadvantages
Discontinuation: As the GS-R405S is no longer in production, sourcing this component may be challenging, necessitating the search for suitable replacements.
Fixed Output Voltage: The fixed 5.1V output may limit its applicability in systems requiring adjustable output voltages.
Thermal Management Requirements: Depending on the operating conditions, additional heatsinking or forced ventilation may be required to manage heat dissipation effectively.
Availability: The GS-R405S is no longer produced, making it hard to find. You might find some through resellers or stock leftovers, but they're not easy to come by.
Specifications: This regulator can handle an input voltage from 9V to 46V, providing a stable output of 5.1V with up to 4A. It’s about 70% efficient in converting power.
Features: It includes safety features like soft start, which prevents sudden surges during start-up, and protection against overload and short circuits. It also has a feature to immediately stop power if the voltage goes too high.
Size: Its dimensions are 85.5mm by 67.0mm by 21.3mm, which is fairly compact for the power it offers.
Heat Management: Depending on how much it’s used, you might need extra cooling like a heatsink or a fan to keep it from overheating.
Documentation: Make sure you can get the datasheet and other technical documents to understand how to use it correctly.
Support and Warranty: Support from the manufacturer might be limited because the product is discontinued. Think about this for future maintenance or replacements.
Alternatives: Because this model is hard to find, consider other similar regulators that are still being made to ensure support and availability in the future.
STMicroelectronics, based in Geneva, Switzerland, is a prominent global semiconductor company specializing in developing advanced microelectronics for diverse applications, including industrial automation, smart devices, and automotive electronics. Renowned for its innovative and energy-efficient solutions, STMicroelectronics offers a broad range of products such as microcontrollers, sensors, and digital integrated circuits. The company emphasizes sustainability and cutting-edge technology in its operations, actively contributing to advancements in IoT, AI, 5G, and electric vehicle technologies, ensuring high performance and reliability across its offerings.
Although the GS-R405S is no longer being made, it remains a solid choice for its efficiency and robust protection features. Those needing a similar regulator should consider current alternatives to ensure they have ongoing support and availability. This regulator sets a high standard for future products in power management.
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