MAX1761EEE

Frequency - Switching:	250kHz, 350kHz
Base Part Number:	MAX1761
Supplier Device Package:	16-QSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 20 V
Output Phases:	1
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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MAX1761EEE application field and working principle

Introduction

MAX1761EEE is a low-cost, low-noise, single-output synchronous step-down switching controller from Maxim Integrated. Its features include an integrated 555-kHz oscillator and true ±99% duty cycle capability, allowing designers to reduce component count, power loss, and overall system cost. The MAX1761EEE limits external component count to only two 0.22μH to 3.3μH inductors, two 2.2μF to 10μF capacitors, one RC network, and one 0.3Ω to 2Ω power switch; no transformer or bias circuitry is needed.

Application Field

The MAX1761EEE is ideally suited for battery-powered portable and embedded systems, as well as space-limited or cost sensitive applications. It operates on voltage rails such as 3 V, 3.3 V, 5 V, USB ports, and 12 V. The device has an adjustable switching frequency of 300 kHz to 700 kHz.The MAX1761EEE is suitable for operating in temperatures from -40°C to +125°C, and can provide outputs up to 30 V across a wide range of load currents from 10 mA to 3 A. The device features a soft-start time of 50 μs, and its current mode control ensures fast transient response and excellent load regulation.

Working Principle

The MAX1761EEE is a synchronous buck-converter controller, which integrates a pulse-width-modulation (PWM) generator, an over-current protective device, an under-voltage lock-out (UVLO) circuit and a driver in one package. The MAX1761EEE works by modulating the output voltage of an inductor-capacitor (LC) filter, which is connected to the input/output pins.The output voltage of the LC filter is controlled by the pulse-width modulation (PWM) generator in the MAX1761EEE. The PWM generator determines the duty cycle of the PWM output, and thus the output voltage. The duty cycle of the PWM generator is determined by the output voltage-setting pin (VSET) and the current limit pin (ILIM). The duty cycle of the PWM generator is also affected by the current sensing pin (ISNS), the output Voltage sense pin(VSNS), and the oscillator frequency. The MAX1761EEE also integrates an over-current protection circuit that detects the over-current condition and prevents the damage of the power switch or output devices. The over-current protection circuit shuts off the power switch when the current reaches a predetermined level. The under-voltage lock-out (UVLO) circuit in the MAX1761EEE will turn off the power switch when the input voltage drops below a certain threshold.

Conclusion

The MAX1761EEE is a low-cost, low-noise, single-output synchronous buck-converter controller from Maxim Integrated. It is designed for a wide range of portable and embedded applications operating on voltage rails such as 3 V, 3.3 V, 5 V, USB ports, and 12 V. The device has an adjustable switching frequency of 300 kHz to 700 kHz and features an integrated 555-kHz oscillator and true ±99% duty cycle capability as well as a soft-start time of 50 μs. It also includes an over-current protective device, an under-voltage lock-out (UVLO) circuit, and a driver in one package.

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