MAX17498CATE+T

Duty Cycle:	94.5%
Base Part Number:	MAX17498
Mounting Type:	Surface Mount
Supplier Device Package:	16-TQFN (3x3)
Package / Case:	16-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	EN, Power Good, Soft Start
Fault Protection:	Current Limiting, Over Voltage
Frequency - Switching:	250kHz
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 36 V
Topology:	Boost, Flyback
Voltage - Breakdown:	--
Internal Switch(s):	Yes
Output Isolation:	Either
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MAX17498CATE+T is a high-efficiency, constant-frequency, current-mode step-down converter switching regulator for low voltage applications. It features a low quiescent current of just 8μA and has a wide input voltage range of 4V to 36V. The device comes in a miniature 5-pin SOT-23 package and is ideal for use in extended battery +5V intermediate bus and secondary power supply applications. This application note will look at the applications of the MAX17498CATE+T, its operating principle and its various features.

Applications

The MAX17498CATE+T is designed to supply an intermediate bus and secondary power supply in a variety of consumer products, including mobile phones and PDAs, digital cameras and camcorders, portable navigation systems, digital audio players, and other portable electronic products. The device is also ideal for other low voltage applications, such as battery charging and input voltage regulation. The device has a very low dropout voltage, which significantly reduces current consumption in power supply applications.

Operating Principle

The MAX17498CATE+T operates in a current-mode, constant-frequency, step-down switching regulator. It features a high-efficiency switching P-channel MOSFET and a high-precision current-mode control circuit, which provides a fast transient response and excellent load and line regulation. The device operates at a fixed switching frequency of 250kHz, providing a low-noise voltage supply for noise-sensitive applications. The device comes with an enable input and provides low quiescent current of just 8μA when disabled. The device also has a power-good output signal that indicates when the output voltage is within regulation.

Features

The MAX17498CATE+T has a wide operating input voltage range of 4V to 36V and a high-efficiency power conversion of up to 97%. It also features integrated soft start, current-limit, and over-temperature protection, to ensure reliable operation in various conditions. The device also has a programmable under-volt lockout function that disables the device if the input voltage drops below the programmed level. The device also has an integrated power-good output signal, which helps to monitor the load regulation of the device. The device comes in a miniature 5-pin SOT-23 package, making it ideal for use in space-constrained applications.

Conclusion

The MAX17498CATE+T is a high-efficiency, constant-frequency, current-mode step-down converter switching regulator for low voltage applications. It features a low quiescent current of just 8μA, a wide input voltage range of 4V to 36V, and integrated soft start, current limit, and over-temperature protection. The device also features an enable input, a power-good output signal, and a programmable UVLO function. The device is ideal for use in battery charging, input voltage regulation and other low voltage applications.

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