MAX1771

PRODUCTION

12V or Adjustable, High-Efficiency, Low I_Q, Step-Up DC-DC Controller

High-Efficiency Even at Low Input Voltages and Noise Reduction

Data Sheet (Rev. 2) Product Selection Table

Part Models: 7
1ku List Price: Starting From $2.28

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Overview

90% Efficiency for 30mA to 2A Load Currents
Up to 24W Output Power
110µA (max) Supply Current
5µA (max) Shutdown Current
2V to 16.5V Input Range
Preset 12V or Adjustable Output Voltage
Current-Limited PFM Control Scheme
Up to 300kHz Switching Frequency
Evaluation Kit Available

The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).

This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors.

The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads.

The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.

Applications

Battery-Powered Applications
Flash Memory Programming
High-Power RF Power-Amplifier Supply
Palmtops/Handheld Terminals
Portable Communicators
Positive LCD-Bias Generators

Part Models: 7
1ku List Price: Starting From $2.28

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1771CPA+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1771CSA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1771CSA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1771EPA+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1771ESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1771ESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1771MJA	Ceramic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

May 1, 2020 - 1702R ASSEMBLY
		pcn_1702r
MAX1771CSA+	PRODUCTION
MAX1771CSA+T	PRODUCTION
Aug 28, 2018 - 1702A ASSEMBLY
		pcn_1702a
MAX1771ESA+	PRODUCTION
MAX1771ESA+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 3
MAX756	PRODUCTION	3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters
MAX761		12V/15V or Adjustable, High-Efficiency, Low-I_Q, Step-Up DC-DC Converters
MAX608	PRODUCTION	5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller

Evaluation Kits

Evaluation Kit for the MAX1771

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Features and Benefits

12V or Adjustable Output Voltage
3V to VOUT + 0.5V Input Range
Up to 0.5A Output Current
5µA Max Shutdown Current
110µA Max Supply Current
300kHz Switching Frequency
8-Pin SO, Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1771 evaluation kit (EV kit) provides a regulated 12V, or adjustable output voltage from an input source as low as 3V. It drives loads up to 0.5A with greater than 80% conversion efficiency.

This EV kit is a fully assembled and tested surface-mount circuit board. Additional pads on the bottom of the board accommodate the external feedback resistors for setting different output voltages.

Applications

Battery-Powered Applications
Flash Memory Programming
High-Power RF Power-Amplifier Supply
Palmtops/Handheld Terminals
Portable Communicators
Positive LCD-Bias Generators

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Overview

Documentation

Data Sheet 1

Reliability Data 1

Design Note 7

Technical Articles 6