MAX1771CSA+T

Frequency - Switching:	300kHz
Base Part Number:	MAX1771
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):	92%
Series:	--
Voltage - Supply (Vcc/Vdd):	3 V ~ 16.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Buck-Boost
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

MAX1771CSA+T is a high-performance switching DC–DC controller that can be used for both buck and boost voltage conversion. This DC-DC switching controller provides improved efficiency for both step-down (buck) and step-up (boost) conversion applications. It contains a logic-level PWM driver, an internal oscillator, a fast under-voltage lockout circuit, and other integrated features. This device is popular for use in consumer electronics, telecom, automotive and industrial applications.

Application Field

The MAX1771CSA+T DC–DC controller has a wide range of applications in consumer electronics, telecom, automotive and industrial applications. This device is suitable for low output voltages ranging from 1.2 V to 36 V with output currents up to 2.5 A. It is suitable for both buck (step-down) and boost (step-up) conversion applications. This device can be used in many different application fields, such as:

• Power supplies and voltage converters,
• Battery chargers and dischargers,
• Load sharing and current limiting,
• AC/DC converters,
• LED driver,
• Automotive applications.

Working Principle

The MAX1771CSA+T DC–DC controller employs a pulse-width modulation (PWM) control method to regulate the output voltage. This device contains an internal fixed frequency oscillator which provides a output frequency up to 500 kHz. The MAX1771CSA+T sets the output voltage by adjusting the duty cycle of the PWM signal. When the output voltage falls below the set value, the duty cycle of the PWM signal increases, which increases the current in the circuit. When the output voltage rises above the set value, the duty cycle decreases and thus reduces the current in the circuit. This cycle repeats until the set output voltage is obtained and the current in the circuit remains constant. The MAX1771CSA+T includes a fast under-voltage lockout circuit to prevent over-stressing the input power source when the input voltage drops below a certain threshold. This device also contains a logic level driver, which can drive an N-channel MOSFET with a threshold voltage as low as 1.5 V. The logic level driver is enabled by a logic input signal and the MOSFET can be powered on or off when the logic signal is high or low, respectively.

Conclusion

The MAX1771CSA+T DC–DC controller is versatile, efficient, and cost effective. It can be used for both buck (step-down) and boost (step-up) conversion applications, and it is widely used in consumer electronics, telecom, automotive and industrial applications. It contains a logic-level PWM driver, an internal oscillator, a fast under-voltage lockout circuit, and other integrated features. This device is a popular choice for power supplies in many application fields.

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