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LM3559 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3559 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 50 page  2.5 3.0 3.5 4.0 4.5 5.0 Vin (V) 95.0 90.0 85.0 80.0 75.0 70.0 65.0 60.0 55.0 50.0 45.0 40.0 ILED = 450 mA ILED=281.25 mA ILED = 337.5 mA ILED = 393.75 mA Copyright © 2016, Texas Instruments Incorporated HWEN SCL SDA STROBE TX1/TORCH/GPIO1 IN OUT GND LED1 LED2 LEDI/NTC SW TX2/INT/GPIO2 D2 LM3559 Optional Indicator LED or LED Thermal Sensing Circuit Flash LEDs D1 2.5 V to 5.5 V Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM3559 SNVS624B – JUNE 2011 – REVISED JUNE 2016 LM3559 Synchronous Boost Flash Driver With Dual 900-mA High-Side Current Sources (1.8-A Total Flash Current) 1 1 Features 1 • Dual High-Side Current Sources Allow for Grounded Cathode LED Operation • Accurate and Programmable LED Current from 28.125 mA to 1.8 A • Optimized Flash Current During Low Battery Conditions • Independent LED Current Source Programmability • Four Operating Modes: Torch, Flash, Privacy Indicate, and Message Indicator • 4-Bit Analog-to-Digital (ADC) for VLED Monitoring • Battery Voltage Sensing and Current Scale-Back • LED Sensing and Current Scale-Back • Hardware Flash and Torch Enable • Active-Low Hardware Reset • Dual Synchronization Inputs for RF Power Amplifier Pulse Events • LED and Output Disconnect During Shutdown • Open and Short LED Detection • 400-kHz I2C-Compatible Interface 2 Applications • Camera Phone LED Flash • White LED Biasing Simplified Schematic 3 Description The LM3559 is a 2-MHz fixed-frequency synchronous boost converter with two 900-mA constant current drivers for high-current white LEDs. The dual high- side current sources allow for grounded cathode LED operation and can be tied together for providing flash currents of up to 1.8 A. An adaptive regulation method ensures the current for each LED remains in regulation and maximizes efficiency. The LM3559 is controlled via an I2C-compatible interface. Features include: an internal 4-bit ADC to monitor the LED voltage, independent LED current control, a hardware flash enable allowing a logic input to trigger the flash pulse, dual TX inputs which force the flash pulse into a low-current torch mode allowing for synchronization to RF power amplifier events or other high-current conditions, an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current, an input voltage monitor to monitor low battery conditions, and a flash current scale-back feature that actively monitors the battery voltage and optimizes the flash current during low battery-voltage conditions. Additionally, an active high HWEN input provides a hardware shutdown during system software failures. The 2-MHz switching frequency, overvoltage protection, and adjustable current limit allow for the use of tiny, low-profile (1-µH or 2.2-µH) inductors and (10-µF) ceramic capacitors. The device is available in a ultra-small 16-pin DSBGA package (total solution size < 26 mm2) and operates over the –40°C to +85°C temperature range. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM3559 DSBGA (16) 1.96 mm × 1.96 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. LED Efficiency vs VIN Dual LEDs (Flash Brightness Codes 0x88 - 0xAA) |
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