MAX858ESA+T

Voltage - Output (Min/Fixed):	3.3V, 5V
Base Part Number:	MAX858
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:	No
Frequency - Switching:	500kHz
Current - Output:	125mA (Switch)
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	0.8V
Number of Outputs:	1
Output Type:	Programmable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

MAX858ESA+T is a step-up DC-DC switching regulator that operates from 0.9 V to 14 V input voltage and offers up to 1.5 A of current output for a wide range of applications. This device integrates an advanced switching regulator controller, an integrated high-side MOSFET, and an adjustable soft-start circuit that together provide a highly efficient, compact, and reliable power supply solution. This regulators utilizes a synchronous boost topology and is suited for applications that require high power density and rail-to-rail output.

Applications

MAX858ESA+T offers a wide range of applications. It can be used for:

• Portable Medical and Industrial Systems
• Wearables and Connected Devices
• Li-Ion/ Li-Polymer Battery Chargers
• Battery Backup System
• Charging Headphones
• Lighting Control System

Working Principle

The MAX858ESA+T operates from input voltages ranging from 0.9 V to 14 V. The adjustable soft-start circuit allows for a simple system turn-on with improved performance in startup current, output voltage accuracy, and system noise. To provide high efficiency the device operates in a current-mode control PWM architecture. The integrated synchronous switching regulator controller contains two N-FETs, one high-side and one low-side, that achieve zero-current switching at light load, enabling high efficiency (up to 96%) at no-load and light-load conditions. The adjustable current-limit circuit with Overtemp Shutoff prevents over-current and over-temperature conditions by monitoring the drain current of the low-side N-FET and the die temperature. The device also offers a wide adjustable output voltage range of 0.9 V to >1.6 V, depending on the input voltage. Output voltage and switching frequency are programmed by two external resistors.

Conclusion

MAX858ESA+T provides a highly efficient, small-footprint, and reliable power solution for a wide range of applications. This device operates from 0.9 V to 14 V input voltage and offers up to 1.5 A of current output. It integrates an advanced switching regulator controller, a high-side MOSFET, and an adjustable soft-start circuit that together deliver superior performance at start-up and in running conditions. The adjustable current limit and overtemp shutoff protect the system from over-current and over-temperature conditions. Overall, MAX858ESA+T is a highly reliable and efficient solution for a broad range of applications. It has the high power density and excellent output voltage accuracy that make it a great choice for applications such as Li-Ion/Li-Polymer battery chargers and lighting control systems. Thus, MAX858ESA+T is a versatile switching regulator meeting the needs of the ever-evolving market.

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