MAX887

PRODUCTION

100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter

Internal Power MOSFET and Current-Sense Reduces Component Count and Saves Space

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.25

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Overview

95% Efficiency
600mA Output Current
Cycle-by-Cycle Current Limiting
Low-Dropout, 100% Duty-Cycle Operation, 300mV at 500mA
Internal 0.6Ω (typ) MOSFET
Internal Synchronous Rectifier
High-Frequency Current-Mode PWM
External SYNC or Internal 300kHz Oscillator
Guaranteed 260kHz to 340kHz Internal Oscillator Frequency Limits
2.5µA Shutdown Mode

The MAX887 high-efficiency, step-down DC-DC converter provides an adjustable output from 1.25V to 10.5V. It accepts inputs from 3.5V to 11V and delivers 600mA. Operation to 100% duty cycle minimizes dropout voltage (300mV typ at 500mA). Synchronous rectification reduces output rectifier losses, resulting in efficiency as high as 95%.

Fixed-frequency pulse-width modulation (PWM) reduces noise in sensitive communications applications. Using a high-frequency internal oscillator allows tiny surface-mount components to reduce PC board area, and eliminates audio-frequency interference. A SYNC input allows synchronization to an external clock to avoid interference with sensitive RF and data-acquisition circuits.

The MAX887 features current-mode operation for superior load/line-transient response. Cycle-by-cycle current limiting protects the internal MOSFET and rectifier. A low-current (2.5µA typ) shutdown mode conserves battery life.

Applications

Cell Phones
Computer Peripherals
Distributed Power Systems
Personal Communicators
Portable Instrumentation

Part Models: 2
1ku List Price: Starting From $3.25

Documentation

Data Sheet 1

MAX887-MAX887H: 100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter Data Sheet (Rev.0) 09/01/1996

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
MAX887HESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX887HESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 30, 2020 - 1702R2 ASSEMBLY
		pcn_1702r2
MAX887HESA+	PRODUCTION
MAX887HESA+T	PRODUCTION

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

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