MAX1651CSA

Frequency - Switching:	Up to 300kHz
Base Part Number:	MAX1651
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	96.5%
Series:	--
Voltage - Supply (Vcc/Vdd):	3 V ~ 16 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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MAX1651CSA Voltage Regulator Overview

The MAX1651CSA is a highly efficient, low-voltage, integrated DC-DC synchronous switching regulator IC with a high switching frequency and fast response time. It is designed to provide a regulated output voltage with an operating voltage range of 1.5V to 15V. TheMAX1651CSA is particularly well-suited for applications requiring high efficiency, low output noise, low jitter, and small package size.

MAX1651CSA Features

The MAX1651CSA is capable of delivering up to 1.5A of output current while consuming a quiescent current of just 40 uA. Its excellent transient response enables the device to precisely regulate output voltages even after large input voltage transitions. It also provides a shutdown function, power-good indication, and current-limit detection output for improved protection.

Application Field :

The MAX1651CSA is ideal for a variety of battery-powered applications such as cellular phones, PDAs, and portable computers. It is also well suited for applications requiring low output ripple and exact regulation of output voltage.

Working Principle:

The MAX1651CSA converts a DC voltage input into a regulated DC voltage output using a synchronous, full-bridge topology with an N-channel MOSFET switch and an integrated MOSFET high-side driver.The device operates at a fixed frequency of approximately 300kHz and generates the output voltage via pulse width modulation (PWM). This yields high efficiency over a wide input voltage and load current range.The device has an internal undervoltage lockout (UVLO) circuit that powers down the device if the input voltage falls below a predetermined threshold. This protects the device from unintentional operation at low input voltages.The MAX1651CSA also has an on-chip Dual-Mode Detect circuit for monitoring the output voltage. The Dual-Mode Detect circuit provides both an internal power-good indication, as well as an external fan-board signaling pin. The pin can be connected to a fan driver IC to disable the fan if the output voltage is too low.The device also provides a current-limit detect output pin, which can be connected to an external power switch to disconnect the load in case of an over-current situation.

Conclusion

The MAX1651CSA is a highly efficient and reliable DC-DC synchronous switching regulator IC that is ideal for battery-powered applications. It is capable of delivering up to 1.5A of output current while consuming as low as 40uA of quiescent current. Its high switching frequency and fast response time enable it to precisely regulate output voltage even after large input voltage transitions. It also provides an integrated power-good indication, current-limit detect output, and internal undervoltage lockout.

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