LP5527 - Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization from the PowerWise® Family

Datasheet Packaging Samples & Pricing Application Notes Knowledge Base

Features
•High current boost DC-DC converter (up to 1A output current)
•Programmable boost output voltage
•400 mA flash LED constant current driver with low tolerance and a safety circuit
•Synchronization pin for the flash timing
•Two single-ended audio inputs with gain control
•Four constant current 15 mA LED drivers with 8-bit programmable brightness control
•Audio synchronization feature
•I2C compatible control interface
•Built-in LED connectivity test to maximize manufacturing yield
•Small microSMD-30 package (2.5 mm x 3.0 mm x 0.6 mm)

General Description

The LP5527 is a lighting management unit for handheld devices with I2C compatible control interface. More...


Applications

•Camera FLASH, funlight and backlight driving in battery powered devices
  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Regulated LEDs 5
LED Configuration Parallel
Current Matching 1%
Boost Type Inductive
Switching Frequency 2000 kHz
Switching Type PWM
Total LED Current 460 mA
Efficiency (peak) 90 %
PowerWise Technology Audio Adaptive RGB LED Driver
Regulated LEDs 5
LED Configuration Parallel
Current Matching 1%
Boost Type Inductive
Switching Frequency 2000 kHz
Switching Type PWM
Total LED Current 460 mA
Efficiency (peak) 90 %
PowerWise Technology Audio Adaptive RGB LED Driver
Boost Voltage Regulated
Supply Current 1300 mA
Input Min Voltage 3 Volt
Input Max Voltage 5.5 Volt
OutputMax Voltage 5 Volt
PWM BrightCtrl No
Analog-V BrightCtrl No
Ambient Light Compensation No
RGB-LED No
Temperature Min -30 deg C
Temperature Max 85 deg C
RegType Lighting Management Unit
PowerWise Yes
View Using Catalog

  Additional Resources
Application Notes (see below)


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LP5527 Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization 831 Kbytes 19-May-06 View Online
Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LP5527TLMICRO SMD30NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.90reel
of
250		XYTT
I 5527
6 weeksN/A
LP5527TLXMICRO SMD30NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.90reel
of
3000		XYTT
I 5527
6 weeksN/A

General Description

The LP5527 is a lighting management unit for handheld devices with I2C compatible control interface. The LP5527 has a step-up DC/DC converter with high current output and it drives display and keypad backlights and powers the camera flash LED. In addition the DC/DC converter has the output current to power for example an audio amplifier simultaneously. The chip has four 8-bit programmable high efficiency constant current LED drivers and a FLASH LED driver. Built-in audio synchronization feature allows the user to synchronize one of the LEDs to audio input.

The LP5527 has an integrated 400 mA flash driver with a safety stop feature and 50 mA torch mode. An external enable pin is provided for the synchronizing the flash with the camera action. An external software independent test interface provides a fast way to find a broken path or short on LED circuits. Very small microSMD package together with minimum number of external components is a best fit for handheld devices.

More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1502: AN-1502 LP5526 Evaluation Kit 2362 Kbytes 12-Mar-07 Download
AN-1632: AN-1632 LP5521 Evaluation Kit 2039 Kbytes 27-Aug-08 Download
AN-1636: AN-1636 LP5522 Evaluation Kit 1568 Kbytes 13-Jun-07 Download
AN-1636 (Chinese): AN-1636 LP5522 Evaluation Kit
 435 Kbytes  
AN-1702: AN-1702 LP5524 Evaluation Kit 491 Kbytes 17-Mar-08 Download
AN-1523: AN-1523 LP5521 Power Efficiency Considerations 5526 Kbytes 17-Apr-08 Download
AN-1562: AN-1562 LP5521 Programming Considerations 761 Kbytes 17-Apr-08 Download
AN-1442: Application Note 1442 Design and Programming Examples for Lighting Management Unit LP5526 749 Kbytes 26-Jan-07 Download
AN-1442 (Chinese): Application Note 1442 Design and Programming Examples for Lighting Management Unit LP5526
 638 Kbytes  

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[Information as of 7-Jan-2009]