LP55271 - 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 Knowledge Base

Features
•High current boost DC-DC converter (up to 1A output current)
•Programmable boost output voltage
•370 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 LP55271 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 430 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 430 mA
Efficiency (peak) 90 %
PowerWise Technology Audio Adaptive RGB LED Driver
Boost Voltage Regulated
Supply Current 1400 mA
Input Min Voltage 3 Volt
Input Max Voltage 5.5 Volt
OutputMax Voltage 5.4 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

  Block Diagram
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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LP55271 Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization 828 Kbytes 6-Sep-06 View Online
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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
LP55271TLMICRO SMD30NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.90reel
of
250		XYTT
I D55B
6 weeksN/A
LP55271TLXMICRO SMD30NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.90reel
of
3000		XYTT
I D55B
6 weeksN/A

General Description

The LP55271 is a lighting management unit for handheld devices with I2C compatible control interface. The LP55271 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 LP55271 has an integrated 370 mA flash driver with a safety stop feature and 46 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.

[Information as of 7-Jan-2009]