MAX1765EEE+

Voltage/Current - Output 3:	--
Base Part Number:	MAX1765
Supplier Device Package:	16-QSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	0.7 V ~ 5.5 V
w/Sequencer:	No
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	2.85V/Adj, 500mA
Voltage/Current - Output 1:	2.5 V ~ 5.5 V, 800mA
Frequency - Switching:	1MHz
Number of Outputs:	2
Function:	Any Function
Topology:	Step-Up (Boost) Synchronous (1), Linear (LDO) (1)
Part Status:	Active
Packaging:	Tube

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MAX1765EEE+ Application Field and Working Principle

PMIC - Voltage Regulators - Linear + Switching

The MAX1765EEE+ is an ultra-small voltage regulator designed for use in smartphones and other portable devices. The device is ideal for applications where energy efficiency is essential, such as in battery-operated applications. The MAX1765EEE+ consists of a linear regulator, a switch regulator, and various protection and management circuits. The device is well suited for power management units in which multiple power sources share the same chip.

Features

The MAX1765EEE+ offers a low quiescent current of only 40μA, achieving higher energy efficiency and smaller board space. Additionally, the device goes into a 0.5μA power-down mode when the output is disabled. It is available in a tiny 2mm x 2mm TDFN package, providing design engineers with an optimal solution for even the most space-constrained applications. The MAX1765EEE+ also includes a variety of safety features, protecting against over-temperature, over-current, and reverse-current conditions.

Working Principle

The MAX1765EEE+ features a linear-mode output for low-noise, high-accuracy voltage regulation, and a switch-mode output for high-efficiency power conversion. The device automatically selects the appropriate mode, depending on output voltage and load current. When the load current is within the maximum linear-mode specification, the device operates in linear mode. When the load current exceeds the linear-mode specification, the device automatically switches to switch mode.The linear-mode output is achieved via an ON/OFF switch, the output voltage being set and regulated by the amplifier’s reference voltage. A fixed-frequency, pulse-width-modulated (PWM) control loop is used in switch-mode operation to ensure fast and accurate response to load changes.The MAX1765EEE+ also has an integrated selectable output voltage function, allowing for a wide range of output voltages from 0.8V to 5.5V. Additionally, a slew-rate-limited control loop reduces input ripple voltage, ensuring that the desired output voltage is maintained over the full operating range.

Conclusion

The MAX1765EEE+ is an ultra-small voltage regulator designed for use in portable applications with stringent power requirements. The device offers low quiescent current and a selection of protection and control features, coupled with a wide output voltage range, ensuring an optimal solution for even the most space-constrained applications. The device features both a linear-mode output for low-noise and high-accuracy, and a switch-mode output for higher efficiency.

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