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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 176kB) Download   E-Mail

Description

The MAX848/MAX849 boost converters set a new standard of high efficiency and high integration for noise-sensitive power-supply applications, such as portable phones and small systems with RF data links. The heart of the these devices is a synchronous boost-topology regulator that generates a fixed 3.3V output (or 2.7V to 5.5V adjustable output) from one to three NiCd/NiMH cells or one Li-Ion cell. Synchronous rectification provides a 5% efficiency improvement over similar nonsynchronous boost regulators. In standby mode, pulse-skipping PFM operation keeps the output voltage alive with only 150µW quiescent power consumption. Fixed-frequency PWM operation ensures that the switching noise spectrum is limited to the 300kHz fundamental and its harmonics, allowing easy post-filtering noise reduction. For even tighter noise spectrum control, synchronize to a 200kHz to 400kHz external clock. Battery monitoring is provided by a two-channel, voltage-to-frequency analog-to-digital converter (ADC). One channel is intended for a single-cell battery input (0.625V to 1.875V range), while the other channel is for monitoring higher voltages (0V to 2.5V range). Two control inputs are provided for push-on, push-off control via a momentary pushbutton switch. Upon power-up, an internal comparator monitors the output voltage to generate a power-good output (POK). The devices differ only in the current limit of the N-channel MOSFET power switch: 0.8A for the MAX848, and 1.4A for the MAX849.

An evaluation kit is available:  MAX849EVKIT  

Key Features		Applications/Uses
Up to 95% Efficiency 3.3V Dual Mode™ or 2.7V to 5.5V Adj. Output 0.7V to 5.5V Input Range 0.15mW Standby Mode 300kHz PWM Mode or Synchronizable Two-Channel ADC with Serial Output Power-Good Function		Cell Phones Digital Cordless Phones Handheld Instruments (PDAs, Palmtops) Local 3.3V to 5V Supplies Palmtop Computers PCS Phones Personal Communicators

Diagram

Typical Operating Circuit

Application Notes

Application Note 751: Linear Regulators in Portable Applications - MAX849

Evaluation Kits

MAX849EVKIT

Reliability Reports

Show FIT data for: MAX848 MAX849 Request Reliability Report for: MAX848 MAX849

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX848	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX848ESE			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX848ESE-T			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX848ESE+			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX848ESE+T			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX849	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX849ESE			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16-5*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX849ESE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX849ESE+			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX849ESE+T			Active	SOIC(N);16 pin;61.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0097 (PDF) Use pkgcode/variation: S16+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes and Comments

1-cell operation, high-efficiency, low-noise design and high functionality make it ideally suitable for portable phones and other systems with RF data links

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