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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 268kB) Download   E-Mail

Description

The MAX1573 fractional charge pump drives up to four white LEDs with regulated constant current for uniform intensity. By utilizing proprietary adaptive 1x/1.5x modes and ultra-low-dropout current regulators, it maintains the highest possible efficiency over the full 1-cell Li+ battery input voltage range. The 1MHz fixed-frequency switching allows for tiny external components and the regulation scheme is optimized to ensure low EMI and low input ripple. An external resistor sets the full-scale LED current, while two digital inputs control on/off and select amongst three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness, requiring no additional components. The MAX1573 is available in the tiny chip-scale UCSP™ (4 x 4 grid) and 16-pin thin QFN packages.

An evaluation kit is available:  MAX1573EVKIT  

Key Features		Applications/Uses
Proprietary Adaptive 1x/1.5x Modes High Efficiency (PLEDs/PBATT), Up to 92% 0.2% LED Current Matching 28mA/LED Drive Capability Low Input Ripple and EMI Eliminates Ballast Resistors Logic or PWM Dimming Control Low 0.1µA Shutdown Current 2.7V to 5.5V Input Voltage Range Soft-Start Limits Inrush Current Output Overvoltage Protection Thermal Shutdown Protection No External Schottky Diode Required Tiny UCSP (2.1mm x 2.1mm x 0.6mm) and Thin QFN (4mm x 4mm) Packages		Cell Phones/Smartphones MP3 Players Other Handhelds with Color Displays PDAs, Digital Cameras, and Camcorders

Diagram

Typical Operating Circuit

Application Notes

Application Note 3243: White-LED Boost Converter vs. Charge Pump - MAX1573 Application Note 3287: White-LED Driver Provides 64-Step Logarithmic Dimming - MAX1573

Evaluation Kits

MAX1573EVKIT

Design Guides

Displays (PDF)

Reliability Reports

Show FIT data for: MAX1573 Request Reliability Report for: MAX1573

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

MAX1573	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1573TQFNEVKIT			Active	Land Pattern: Not Available		See data sheet
MAX1573ETE+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1573ETE+			Active	TQFN;16 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0070 (PDF) Use pkgcode/variation: T1644+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1573ETE			Active	TQFN;16 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0070 (PDF) Use pkgcode/variation: T1644-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1573ETE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1573EBE-T			Active	UCSP;14 pin;4.3 mm² Outline Drawing: 21-0101 (PDF) Land Pattern: Not Available Use pkgcode/variation: B16-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

More Information

New Product Press Release 2003-05-05

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