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Data Sheet

FULL DATA SHEET (PDF, 260kB) Download   E-Mail

Description

The MAX1575 charge pump drives up to four white LEDs in the main display and up to two white LEDs in the sub-display with regulated constant current for uniform intensity. By utilizing adaptive 1x/1.5x charge-pump modes and very-low-dropout current regulators, it achieves high efficiency over the full 1-cell lithium-battery input voltage range. A 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple. The MAX1575 uses an external resistor to set the full-scale 100% LED current. Two enable inputs, ENM and ENS, are used for simple on/off controls for the main and sub-displays, respectively. By repeatedly pulsing either enable input, the LEDs can be dimmed in multiple steps down to 5%. Once the desired brightness is set, the MAX1575 maintains that brightness setting as long as the enable input is kept high. If an enable input is kept low for more than 2ms, the LED current for the respective display is set to zero. If both enable inputs are kept low for more than 2ms, the MAX1575 enters shutdown. The MAX1575 is available in a 16-pin 4mm x 4mm thin QFN package (0.8mm max height).

Key Features		Applications/Uses
Powers Main and Sub-Display LEDs 85% Average Efficiency (PLED / PBATT) Over Li+ Battery Discharge 2% LED Current Matching Up to 30mA/LED Drive Capability Adaptive 1x/1.5x Mode Switchover Low Input Ripple and EMI Individual 5% to 100% Dimming Through Single-Wire Serial Pulse Interface Low 0.1µA Shutdown Current 2.7V to 5.5V Supply Voltage Range Soft-Start Limits Inrush Current Output-Overvoltage Protection Thermal-Shutdown Protection 16-Pin Thin QFN 4mm x 4mm Package		Cell Phones with Main and Sub-Displays PDAs/Smartphones with Up to Six White LEDs

Application Notes

Application Note 1804: Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently - MAX1575

Evaluation Kits

MAX1575EVKIT

Design Guides

Displays (PDF)

Reliability Reports

Show FIT data for: MAX1575 Request Reliability Report for: MAX1575

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
MAX1575	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1575ETE/V+T			TQFN;16 pin;17 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
MAX1575ETE/V+			TQFN;16 pin;17 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
MAX1575ETE+T			TQFN;16 pin;17 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
MAX1575ETE+			TQFN;16 pin;17 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
MAX1575ETE			TQFN;16 pin;17 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
MAX1575ETE-T			TQFN;16 pin;17 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

More Information

New Product Press Release 2004-02-02

Related Products

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