MAX17502GATB+T

Series:	Himalaya
Packaging:	Tape & Reel (TR)
Part Status:	Active
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Adjustable
Number of Outputs:	1
Voltage - Input (Min):	4.5V
Voltage - Input (Max):	60V
Voltage - Output (Min/Fixed):	0.9V
Voltage - Output (Max):	55.2V
Current - Output:	1A
Frequency - Switching:	600kHz
Synchronous Rectifier:	Yes
Operating Temperature:	-40°C ~ 125°C (TJ)

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Introduction

The MAX17502GATB+T is a high performance, low quiescent current charge pump DC/DC converter IC, designed to provide a regulated output voltage from an input voltage of +1.5V to +5.5V. Its wide input range capabilities and integrated FETs make it suitable for applications such as Li-ion battery-powered devices, USB devices, cellular phones and PDAs. Additionally, its ability to adjust the output voltage to the required voltage for mobile device can extend the battery life significantly. This article will discuss the application field and working principles of the MAX17502GATB+T.

Application Field

The MAX17502GATB+T is designed with two integrated N-Channel FETs and a P-Channel FET, with an on-chip synchronous rectifier, to support up to 95% efficiency. This makes it the ideal choice for applications which require a regulated output voltage, such as mobile phones, PDAs, and battery-powered systems. Additionally, its low quiescent current capabilities make it suitable for applications that are sensitive to power consumption such as wrist watches, Bluetooth headsets and smart cards.The MAX17502GATB+T can also be used in automotive and industrial applications. The wide operating temperature range of -40 to +85 Celsius makes it suitable for automotive applications and its high switching frequency, wide duty cycle range and a low minimum on-time make it ideal for use in industrial applications.

Working Principle

The MAX17502GATB+T works on the principle of charge-pump DC/DC conversion. This involves using an internal voltage doubler circuit to double input voltage to the maximum of 1.645V and then use two low-side and one high-side FETs to generate a regulated output voltage. The device consists of three primary components, a voltage doubler, two low-side FETs and one high-side FET.The voltage doubler consists of an internal clock circuit, two charging capacitors and a voltage level detector circuit. The clock oscillator generates a square wave pulse, which is then used to charge the two capacitors which are then discharged. This charge and discharge creates a ramp voltage, which is then monitored by the voltage detection circuit, and the output voltage is adjusted accordingly.The two low-side FETs and the one high-side FET are connected in series with the output load, and the high-side FET is used to control the output voltage. The high-side FET is turned on and off by an internal clock in order to adjust the output voltage. Additionally, the low-side FETs are used to discharge the output capacitance, resulting in a regulated output voltage.

Conclusion

The MAX17502GATB+T is a high performance, low quiescent current charge pump DC/DC converter IC, designed to provide a regulated output voltage from an input voltage of +1.5V to +5.5V. It is suitable for applications such as Li-ion battery-powered devices, USB devices, cellular phones and PDAs, and is also suitable for automotive and industrial applications. Additionally, its ability to adjust the output voltage to the required voltage for mobile device can extend the battery life significantly. The MAX17502GATB+T works on the principle of charge-pump DC/DC conversion, which involves using an internal voltage doubler circuit to double input voltage to the maximum of 1.645V and then use two low-side and one high-side FETs to generate a regulated output voltage.

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