MAX1852EXT+T

Voltage - Output (Min/Fixed):	-Vin, 2Vin
Base Part Number:	MAX1852
Supplier Device Package:	SC-70-6
Package / Case:	6-TSSOP, SC-88, SOT-363
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	50kHz
Current - Output:	30mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Charge Pump
Output Configuration:	Positive or Negative
Function:	Ratiometric
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

Max1852EXT+T is a DC-DC switching regulator specifically designed for low power, low voltage, Step-Up applications. This low voltage DC-DC switching regulator combines precise power conversion with excellent efficiency, with 0.9V to 3.2V input voltage range, 0.95V to 4.6V output voltage range and up to 750mA output current. This device integrates an on-chip clock, low power shutdown mode and filter capacitor and thus simplifies design by introducing few external components.

Application Field

The Max1852EXT+T is suitable for space constrained medical, consumer, automotive and industrial applications. It is ideal for powering a wide range of low power sensors, microcontrollers, RF transceivers and optical modules. This device is also suitable for low voltage boost applications. Due to its higher efficiency, the Max1852EXT+T can reduce size, weight, complexity and cost of system power supplies.

Working Principle

The Max1852EXT+T DC-DC step-up converter is based on peak current-mode control architecture. Max1852EXT+T employs an on-chip switch current-mode oscillator that uses an internal comparator to sample the output voltage and then adjust the output voltage by Pulse Width Modulation (PWM). It also uses Pulse Frequency Modulation (PFM) to minimize power consumption in the light load condition while the output voltage remains in regulation.Max1852EXT+T accepts an input voltage down to 0.9V and produces an output voltage up to 4.6V with an accuracy of ±2%. This regulator includes an integrated high-side switch, internal compensation network and an on-chip voltage reference providing excellent line and load regulation performance.Besides excellent current-mode control stability, Max1852EXT+T also provides device level protection such as integrated over temperature and over current protection.

Main Features

The main features of Max1852EXT+T include:

• High efficiency up to 95%
• 0.9V to 3.2V input voltage range
• 0.95V to 4.6V output voltage range
• Integrated clock with 0.9MHz switching frequency
• Up to 750mA output current
• Low shutdown current
• Integrated over current and over temperature protection
• Integrated loop compensation network

Conclusion

The Max1852EXT+T is an ideal solution for a wide range of low power and low voltage applications. It provides high efficiency, low shutdown current and excellent current-mode control stability. This regulator features an on-chip clock for precise timing and an on-chip filter capacitor to keep the output voltage in regulation with minimal external components. With its integrated protection and excellent line and load regulation performance, Max1852EXT+T allows designers to simplify and shorten the design process while achieving the desired output voltage.

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