S-8338AAEC-P8T1G

Voltage - Supply (Vcc/Vdd):	1.8 V ~ 6 V
Supplier Device Package:	8-SON (A) (2.9x2.8)
Package / Case:	8-SMD, Flat Lead
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	88.5%
Frequency - Switching:	257.4kHz ~ 1.134MHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

The S-8338AAEC-P8T1G is a step-down (buck) DC/DC switching controller with an integrated high-side power transistor. It is used in notebook-power supply, DC/DC converter and multi-output power supplies for multiple voltage rails. It features a high-side power MOSFET and operates using a fixed-frequency pulse-width modulation (PWM) architecture with a constant off-time (COT) control technique, providing excellent regulation accuracy, low output ripple and fast line/load transient response. The S-8338AAEC-P8T1G is a complete controller IC with a built-in high-side power MOSFET, which simplifies the power supply design and reduces component count.

Application Field and Working Principle

The S-8338AAEC-P8T1G typically works in a power supply circuit with a pair of input capacitors, two resistors, two diodes, an inductor and an output capacitor. This power supply operates by the principle that when the MOSFET is turned off, the input voltage applied to the inductor will build up a current in the inductor which is stored as magnetic field energy. While the MOSFET is on, the voltage across the inductor will drop and the magnetic field energy stored in the inductor is converted into electrical energy, which is then transferred to the output capacitor. This process is regulated by the S-8338AAEC-P8T1G switching controller, which will turn the MOSFET on and off at a constant frequency and duty cycle.The S-8338AAEC-P8T1G is designed to be used in DC/DC applications such as notebook-power supply, DC/DC converter and multi-output power supplies for multiple voltage rails. The S-8338AAEC-P8T1G features a high-side power MOSFET, a constant off-time PWM control architecture and soft start function, which provides excellent regulation accuracy, low output ripple, fast transient response and power-on protection.The S-8338AAEC-P8T1G is equipped with an error amplifier, a timing control circuit, a power MOSFET driver and a soft-start circuit. The error amplifier compares the voltage at the FB pin with a reference voltage at the COMP pin and outputs an analog error signal to the timing control circuit, which then adjusts the switching frequency and duty cycle to maintain the output voltage.The S-8338AAEC-P8T1G also has an adjustable soft-start circuit which reduces the inrush current by slowly increasing the output voltage after the power is applied. This soft-start function also prevents large transients from occurring during power turn-on.

Summary

The S-8338AAEC-P8T1G is notable for switching controllers. Its features are high-side power MOSFET, a constant off-time PWM control architecture and soft start function, providing excellent regulation accuracy, low output ripple, fast transient response and power-on protection. The S-8338AAEC-P8T1G is suitable for DC/DC applications such as notebook-power supply, DC/DC converter and multi-output power supplies for multiple voltage rails. In operation, it uses a fixed-frequency pulse-width modulation technique to maintain a constant output voltage. It reduces the inrush current by slowly increasing the output voltage with its adjustable soft-start circuit. The S-8338AAEC-P8T1G is a highly efficient and cost effective solution in switching controller applications.

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