SG3524NG4

Frequency - Switching:	450kHz
Base Part Number:	SG3524
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Current Limit, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	45%
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 40 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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SG3524 is a family of Linear Technology Corporation is a pulse-width modulation (PWM) integrated circuit that functions as a DC to DC buck converter. It can be used to reduce a voltage from one level to another, allowing for current-sensing, clock synchronization, gate drivers, voltage feeds, thermal shutdowns, and other protections. The SG3524NG4 is a medium power voltage regulator that provides high current, wide input voltage range, and high efficiency power conversion. Because of its small size and low price, SG3524NG4 is a popular choice for applications such as computer power supplies, automotive applications, motor controls, lighting systems, and switch mode power supplies.The SG3524NG4 is a current mode PWM controller designed to provide the necessary features and performance for medium power applications with various types of power conversion topologies. It uses a self-oscillating architecture with a programmable frequency range down to 200kHz. The chip also provides under-voltage detection and serially programmable clock divider. The SG3524NG4 also enhances conversion efficiency while providing short-circuit protection. The SG3524NG4 provides an external reference voltage reference that has a wide adjustment range and can be precisely adjusted using an external resistor divider. The pin-programmable 48V absolute maximum voltage rating and varistor for transient voltage protection help further enhance the robustness of the design. The device includes an integrated power MOSFET driver, making it ideal for use with fast switching MOSFETs and IGBTs. A low-ripple voltage feed feature is included to reduce the noise seen at the output. The voltage feed technology provides a power supply rejection ratio (PSRR) of >100dB when operated at low switching frequencies but at higher switching frequencies thePSRR increases to address low voltage ripple requirements.The SG3524NG4 offers several options for programmability. A single resistor can be used to set the oscillator frequency, and a tiny capacitor is sufficient for setting the deadtime. External voltage and current sensing can be used to adjust the peak current determining the duty cycle. The device can support both single-ended and differential sensing configurations, with adjustable gains for accurate current measurements. The current limiting feature of the SG3524NG4 can be used to program the peak current of the MOSFET switches and protect the circuit from excessive current that results in destructive turn-on and turn-off losses. The device can also be programmed to limit the maximum voltage step-up ratio, preventing overvoltage damage to downstream components.The SG3524NG4 provides fast dynamic response, allowing it to quickly compensate for load changes and dynamic operating conditions. This capability is given through its pulse frequency modulated (PFM) mode which enables fast load dynamic responses while keeping high efficiency with wide-range operation.In conclusion, the SG3524NG4 is an excellent PWM integrated circuit for providing efficient, low noise and cost-efficient power conversion. Its compact size and high integration make it suitable for a wide range of applications including computer power supplies, automotive applications, motor controls, lighting systems and switch mode power supplies. It is easy to program and provides robust protection features, enhancing system stability and safety.

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