MAX1687ESA

Voltage - Output (Min/Fixed):	1.25V
Base Part Number:	MAX1687
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	730mA (Switch)
Voltage - Output (Max):	6V
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tube

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MAX1687ESA DC DC Switching Regulators Application Field and Working Principle

The MAX1687ESA DC-DC switching regulator is widely used in various electronic systems, ranging from portable devices to computer peripherals and home appliances. This device is a resonant step-down switching regulator with a synchronous rectifier and integrated high-side MOSFETs. It is designed to operate over a wide input voltage range, up to 60 V, and provides up to 3A of output current.By integrating these components into a single device, this switching regulator provides a cost-effective solution, compared to a discrete solution, while also reducing board space requirements. Additionally, the MAX1687ESA has a wide adjustable switching frequency range and a variety of features, such as over-voltage, over-current, reverse polarity protection, internal compensation, and soft-start.

Operating Principle

The MAX1687ESA employs a constant-frequency, current-mode, pulse width modulation (PWM) control architecture. This type of control is ideal for a high efficiency, low component count, synchronous rectification system.As shown in the block diagram below, an external sense resistor R L senses the output current, and an external capacitor C T determines the current threshold level. The current-mode PWM comparator compares the output voltage to the reference voltage and turns on the external MOSFETs when the differential voltage is outside a specific range.The external PWM clock sets the switching frequency of the MOSFETs and the output voltage ripple. When the external clock frequency is low, the two MOSFETs switch on and off in a staggered manner, allowing the inductor current to flow through both MOSFETs. This allows the MAX1687ESA to achieve high efficiency levels, consistently above 81%.

Features

The MAX1687ESA provides a variety of features to improve system performance and help optimize system design. These features include:

• Output voltage adjustable from 0.6V to 1.2V
• Wide adjustable switching frequency range (700kHz to 2.5MHz)
• High efficiency (up to 81%)
• Three selectable output current and power levels
• Over-voltage, over-current and reverse polarity protection
• Soft-start
• Low EMI switching
• Thermal shutdown protection

The MAX1687ESA can be used in a variety of applications, such as portable computing, telecom, and industrial control. Its wide range of features makes it ideal for these applications.

Package and Pinout

The MAX1687ESA comes in an 8-pin, SOIC package (3mm x 5mm x 0.5mm) and is pin-compatible with the MAX1687. This device has a 40-pin QFN package (4mm x 5mm x 0.5mm) that is also pin-compatible with the MAX1687.

Conclusion

The MAX1687ESA is a highly efficient, low component count synchronous rectifier DC-DC switching regulator which provides a cost-effective solution for a variety of applications. It features adjustable output voltage, wide adjustable switching frequency, over-voltage, over-current, reverse polarity protection, soft-start, thermal shutdown protection, and low EMI switching. With its small size, wide input voltage range, and integrated features, the MAX1687ESA is an excellent solution for portable devices, computers, and other electronics.

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