S-8521F18MC-BPDT2G

Voltage - Supply (Vcc/Vdd):	2.5 V ~ 16 V
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Frequency - Switching:	300kHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

The S-8521F18MC-BPDT2G is a PMIC (Power Management Integrated Circuit) designed and produced by Seiko Epson Corporation. It is part of the Voltage Regulators - DC DC Switching Controllers family, and provides precision power supply control and monitoring. This paper will cover the applications of the S-8521F18MC-BPDT2G, its working principle and recommended condition for operation.

Applications

The S-8521F18MC-BPDT2G is used in the automotive electrical and electronic systems, especially in the vehicle-mounted intelligent system. These systems require efficient and reliable power supply control—the S-8521F18MC-BPDT2G is designed to provide just that.The S-8521F18MC-BPDT2G is well suited for applications such as power distribution in telematics, active and passive device control, integrated circuit protection, power supply monitoring and switching, noise mitigation, fanless thermal management and dynamic limiting.

Working Principle

The S-8521F18MC-BPDT2G is an integrated DC-DC controller which is based on the double pulse mode, where the two pulse train operate at different rates. In this mode, the S-8521F18MC-BPDT2G implements pulse modulation control, which is an efficient and reliable way to control the output voltage.The S-8521F18MC-BPDT2G utilizes a Synchronous-Rectified MOSFET for power switches, so the switching losses are minimized, providing higher efficiency and improved system reliability. On the other side, the temperature-compensated voltage-mode control and current-mode control circuitries provide reliable power supply control.At the same time, the S-8521F18MC-BPDT2G is equipped with a number of monitoring and protection functions. These include over-current protection to guarantee a constant maximum current, temperature monitoring to alert the user if it reaches critical temperature, and power supply droop (feedback to keep the output constant).

Advantages

The S-8521F18MC-BPDT2G provides some advantages compared to other PMICs. Some of these advantages include:- High efficiency, thanks to the synchronous MOSFET that minimizes losses during power switching. - Temperature monitoring and protection to prevent overheating. - The double-pulse mode allows higher accuracy and better power regulation. - Power supply droop prevents output drift due to hot spots.

Recommended Environment Conditions

The S-8521F18MC-BPDT2G is able to operate in a wide range of temperatures and voltages. The recommended operating temperature range is -40 ℃ to 125 ℃, with an absolute maximum rating of 150 ℃. Input voltage is limited to 0 to Vcc. The recommended operating area for the S-8521F18MC-BPDT2G must have good airflow, or a heatsink or fan assembly should be used to dissipate the heat. Good contact between the heatsink and the IC is also recommended to ensure an efficient thermal transfer.

Conclusion

The S-8521F18MC-BPDT2G is a PMIC (Power Management Integrated Circuit) designed and produced by Seiko Epson Corporation. It provides precision power supply control and monitoring, and it is part of the Voltage Regulators - DC DC Switching Controllers family.This PMIC has many applications such as power distribution in telematics, active and passive device control, integrated circuit protection, power supply monitoring and switching, noise mitigation, fanless thermal management and dynamic limiting.This paper has discussed the working principle of the S-8521F18MC-BPDT2G, its advantages, and the recommended environment conditions for operation. With its wide range of applications and reliable performance, this PMIC can help many automotive electrical and electronic systems achieve efficient and reliable power supply control.

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