MAX1937EEI+

Frequency - Switching:	500kHz
Base Part Number:	MAX1937
Supplier Device Package:	28-QSOP
Package / Case:	28-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	6 V ~ 24 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

MAX1937EEI+ is a DC-DC switching controller used in a variety of applications such as applications requiring step up or step down voltage, constant current and power conversion. This IC is available in a range of packages and integrates numerous features to enable a compact, efficient, and cost-effective solution for power regulation. Its main features are related to its design features, which are described in detail in this article.

Design Features

The MAX1937EEI+ is a step-up and step-down DC-DC switching converter IC with an adjustable output voltage from 0.8 V to 5.5 V. It has an adjustable switching frequency of 1 MHz to 1.5 MHz and operates from an input voltage range from 1.5 V to 5.5 V. It integrates all the necessary components for proper operation, i.e. an overvoltage, undervoltage, and overcurrent protection circuit, along with an internal oscillator for producing a square wave. It also has a power good output signal and a thermal shut down protection. Additionally, it features two external resistors for programming the output voltage.The MAX1937EEI+ is designed to be used in a wide range of applications, such as mobile phone chargers, laptop adapters, automotive electronics, etc. It is highly efficient, and its quiescent current is optimized for low power, thus reducing the system power dissipation. In addition, it is short-circuit protected, and its adjustable frequency allows the user to match the switching frequency with the EMI filter performance for the best noise reduction.

Control and Working Principle

The MAX1937EEI+ features a synchronous Rectified Pulse Width Modulation (SRPWM) architecture that provides excellent conversion efficiency over a wide input voltage and output voltage range. In this architecture, the inductor current and output voltage are continuously monitored to ensure proper operation. When the input voltage is applied to the IC, it is first rectified, filtered and compared with the internal reference to produce a feedback signal. This signal is then compared with the internal oscillator signal to produce the control signal for the power stage. The control signal is then used to switch the internal transistors on and off accordingly. When the voltage across the inductor reaches the switching current, the switching circuit is disabled and the current is forced to flow through an external diode. This causes the inductor current to ramp down slowly to the output voltage. When the output voltage drops below the regulation level, the PWM circuit restarts and the process repeats.

Conclusion

The MAX1937EEI+ is an excellent DC-DC switching controller with a wide input voltage and output voltage range, power good output signal and adjustable switching frequency. Its synchronous Rectified Pulse Width Modulation architecture improves efficiency and reduces the system power dissipation, while its built-in protection features protect the user\'s circuitry against overvoltage, over current, undervoltage, and thermal shut down. Its features make it a reliable and efficient choice for a variety of power regulation applications.

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