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Data Sheet

FULL DATA SHEET (PDF, 284kB) Download   E-Mail

Description

The MAX1848 drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices. The step-up converter topology allows series connection of the white LEDs so that the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration. Other benefits include greater simplicity, lower cost, higher efficiency, and greater reliability. This step-up PWM converter includes an internal, high-voltage, low RDSON N-channel MOSFET switch for high efficiency and maximum battery life. A single analog voltage Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1.2MHz current-mode PWM control allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup. The MAX1848 is available in space-saving 8-pin thin QFN (3mm x 3mm) and 8-pin SOT23 packages.

Key Features		Applications/Uses
Constant Current Regulation for Uniform Illumination High 87% Efficiency Analog or Logic Control of LED Intensity 0.8W Output Power with Internal High-Voltage MOSFET Switch Small, Low-Profile External Components 2.6V to 5.5V Input Range 13V Maximum Output with Overvoltage Protection Optimized for Low Input Ripple Programmable Soft-Start 0.3µA Shutdown Current Small 8-pin Thin QFN (3mm x 3mm) and 8-Pin SOT23 Packages		Cell Phones/Smartphones e-Books and Subnotebooks PDAs, Palmtops, and Wireless Handhelds White LED Display Backlighting

Diagram

Typical Application Circuit

Application Notes

Application Note 940: Feedback Circuit Enhances Efficiency of Boost-Converter Current Source - MAX1848 Application Note 1037: Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections - MAX1848 Application Note 1736: Powering Four White LEDs with High Efficiency Using the MAX1848 - MAX1848 Application Note 1750: Powering Six White LEDs with High Efficiency Using the MAX1848 - MAX1848 Application Note 1804: Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently - MAX1848 Application Note 3070: Standard and White LED Basics and Operation - MAX1848 Application Note 3256: Why Drive White LEDs with Constant Current? - MAX1848 Application Note 3444: Light Is On When Power Is Out - MAX1848 Application Note 3624: Driving White LEDs in Clamshell Phones - MAX1848

Evaluation Kits

MAX1848EVKIT

Reliability Reports

Show FIT data for: MAX1848 Reliability Report: MAX1848ExA.pdf

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: 1-6 of 6
MAX1848	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1848EKA			SOT-23;8 pin; Dwg: 21-0078H (PDF) Use pkgcode/variation: K8F-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1848EKA-T			SOT-23;8 pin; Dwg: 21-0078H (PDF) Use pkgcode/variation: K8F-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1848ETA+			TDFN;8 pin; Dwg: 21-0137I (PDF) Use pkgcode/variation: T833+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1848ETA			TDFN;8 pin; Dwg: 21-0137I (PDF) Use pkgcode/variation: T833-2*	-40°C to +85°C	See data sheet
MAX1848ETA-T			TDFN;8 pin; Dwg: 21-0137I (PDF) Use pkgcode/variation: T833-2*	-40°C to +85°C	See data sheet
MAX1848ETA+T			TDFN;8 pin; Dwg: 21-0137I (PDF) Use pkgcode/variation: T833+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

Topmark Coding: MAX1848 New Product Press Release 2001-05-15

Related Products

MAX1698, MAX1698A High-Efficiency Step-Up Current Regulator for LEDs

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

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