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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 736kB) Download   E-Mail

Description

The MAX1570 fractional charge pump drives up to five white LEDs with regulated constant current for uniform intensity. The MAX1570 maintains the highest possible efficiency over the full 1-cell lithium-ion (Li+) battery input voltage range by utilizing a 1x/1.5x fractional charge pump and very-low-dropout current regulators. The MAX1570 operates with 1MHz fixed-frequency switching, allowing for tiny external components. 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 between three levels of brightness. A pulse-width modulation (PWM) signal can also be used to modulate LED brightness. The MAX1570 is available in 16-pin 4mm x 4mm Thin QFN packaging (0.8mm max height).

An evaluation kit is available:  MAX1570EVKIT  

Key Features		Applications/Uses
Excellent 0.3% LED-to-LED Current Matching 30mA/LED Drive Capability Proprietary 1x/1.5x Modes for Ultra-High Efficiency Low Input Ripple and EMI Eliminates Ballast Resistors Digital or PWM LED Dimming Control 0.1µA Shutdown Current 2.7V to 5.5V Supply Voltage Range Soft-Start Limits Inrush Current Thermal-Shutdown Protection No External Inductor, Schottky, or Zener Diode Required Tiny 16-Pin 4mm x 4mm Thin QFN Package Protected by U.S. Patent #6,538,394 B2		Cell Phones/Smartphones Digital Cameras and Camcorders PDAs and Palmtop Computers Portable MP3 Players White LED Backlighting

Diagram

Typical Operating Circuit

Application Notes

Application Note 1037: Charge-Pump and Step-Up DC-DC Converter Solutions for Powering White LEDs in Series or Parallel Connections - MAX1570 Application Note 3256: Why Drive White LEDs with Constant Current? - MAX1570

Evaluation Kits

MAX1570EVKIT

Reliability Reports

Show FIT data for: MAX1570 Request Reliability Report for: MAX1570

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: 1-4 of 4

MAX1570	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1570ETE			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
MAX1570ETE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1570ETE+			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
MAX1570ETE+T			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

More Information

New Product Press Release 2002-09-03

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