MAX1858EEG+T

Frequency - Switching:	100kHz ~ 600kHz
Base Part Number:	MAX1858
Supplier Device Package:	24-QSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Reset
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.75 V ~ 23 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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MAX1858EEG+T Application Field and Working Principle

The MAX1858EEG+T is a complete DC-DC switch-mode controllers for step-up and step-down conversion, with integrated power MOSFETs of 55mOhm, available in low-profile, space-saving WLP package and making them ideal for portable applications. The MAX1858EEG+T is designed to regulate output voltages in both step-up and step-down conversion, making it ideal for an automatic inversion/conversion circuit.

Application Field of MAX1858EEG+T

The MAX1858EEG+T is suitable for Lithium-ion (Li+) battery applications and other portable applications. It can be used in a wide range of applications, including:- Cellular phones - PDAs - Undervoltage lockout - Adjustable chargers - Portable product - Batteries and power supplies- Smartphone and tablet chargers - Power conservation modes- Handheld instruments

Working Principle of MAX1858EEG+T

The MAX1858EEG+T presents a synchronous switch-mode function with a wide input voltage range of 2V to 42V and output voltage range of 0.5V to 8V. It includes an internal 1.35A, 55mΩ synchronous MOSFET and a hysteretic controller, which allows synchronous operation from the input voltage to the output voltage.The basic converter has a maximum output current capability of 2.7A and a 5 mA current-limit threshold. In addition, the device has an undervoltage lockout (UVLO) that limits the input voltage, protecting the load from a collapsed input power supply. The MAX1858EEG+T also features a shutdown function to provide a sealed shutoff and reduce input current to a mere 5nA.The MAX1858EEG+T also features the MAX1858’s constant-frequency architecture, which has tight ± 5% tolerance on the switching frequency. It has a switching frequency range from 500kHz to 1.2MHz and a temperature-compensated soft-start of 10mV/usec, which helps provide fast, uniform output voltage ramp times.

Conclusion

The MAX1858EEG+T is a complete DC-DC switching controller with integrated power MOSFETs, suitable for a wide range of applications from cellular phones, PDAs, adjustable chargers, portable products, batteries, and power supplies. It provides a synchronous switch-mode function with a wide input voltage range of 2V to 42V, output voltage range of 0.5V to 8V, and maximum output current capability of 2.7A. It also has a variety of features, such as an undervoltage lockout (UVLO) that limits the input voltage, a shutdown function to provide a sealed shutoff, and a switching frequency range from 500kHz to 1.2MHz.

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