MAX1733

PRODUCTION

Low-Voltage, Step-Down DC-DC Converters in SOT23

High-Efficiency DC-DC Solution for Low-Voltage Logic Supplies

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.26

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Overview

250mA Guaranteed Output Current
Synchronous Rectifier for Over 90% Efficiency
Tiny 5-Pin SOT23 Package
40µA Quiescent Supply Current
0.01µA Logic-Controlled Shutdown
Up to 1.2MHz Switching Frequency
Fixed 1.8V or 1.5V Outputs (MAX1734)
Adjustable Output Voltage (MAX1733)
±1.5% Initial Accuracy
2.7V to 5.5V Input Range
Soft-Start Limits Startup Current

The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 excellent high-efficiency alternatives to linear regulators in space-constrained applications.

Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.

The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.

Applications

Cell Phones
Computers: Desktop, Workstation, Server
Consumer Audio
Digital Still Cameras
Global Positioning Systems (GPS)
Palmtop Computers
POS Terminals
Wireless Data
Wireless Local Area Networks (WLANs)

Part Models: 2
1ku List Price: Starting From $2.26

Documentation

Data Sheet 1

MAX1733-MAX1734: Low-Voltage, Step-Down DC-DC Converters in SOT23 Data Sheet (Rev.0) 09/15/2000

Design Note 2

Buck Regulator Generates Ultra-Low Output Voltage 06/23/2004

Parallel-Port Interface Powers Low Voltage Systems 09/26/2002

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
MAX1733EUK+	5-SOT_23-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1733EUK+T	5-SOT_23-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 11, 2021 - 1703RN ASSEMBLY
		pcn_1703rn
MAX1733EUK+	PRODUCTION	pcn_1703rn
Feb 4, 2015 - 1341_CANCELLATION ASSEMBLY
		pcn_1341_cancellation
MAX1733EUK+	PRODUCTION
MAX1733EUK+T	PRODUCTION
Jun 29, 2018 - 1703N ASSEMBLY
		pcn_1703n
MAX1733EUK+T	PRODUCTION	pcn_1703n

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 1
MAX1692	PRODUCTION	Low-Noise, 5.5V Input, PWM Step-Down Regulator

Evaluation Kits

Evaluation Kit for the MAX1733, MAX1734

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Features and Benefits

+2.7V to +5.5V Battery Input Voltage

+1.8V Output Voltage

250mA Output Current

Efficiency >85% from 2mA to 250mA

Internal P-Channel Switch and Synchronous Rectifier

0.01µA (typ) IC Shutdown Current

50µA Quiescent Supply Current

Up to 1.2MHz (max) Switching Frequency

Surface-Mount Components

Fully Assembled and Tested

Product Details

The MAX1734 evaluation kit (EV kit) is a fully assembled and tested surface-mount PC board that contains a switching-regulator circuit configured for a +1.8V output. At up to 250mA, it accepts inputs from a +2.7VDC to +5.5VDC source or a 1-cell lithium-ion (Li+) or 2- to 3-cell battery.

The MAX1734 features an internal P-channel MOSFET switch, a synchronous rectifier, logic-controlled shutdown, and digital soft-start to limit startup current. The MAX1734 EV kit provides low quiescent current and efficiency up to 93%, providing maximum battery life. High-frequency operation up to 1.2MHz with a maximum duty cycle of 100% allows the use of tiny surface-mount components. The EV kit can also evaluate the MAX1733 after modifications.