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LM36922 Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte LM36922
Spiegazioni elettronici  Highly Efficient Dual-String White LED Driver
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

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VOUT (Up to 38V)
IN
SW
OVP
LED1
LED2
GND
VBATT
HWEN
LM36922H
PWM
SDA
SCL
VIO
ASEL
Product
Folder
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Technical
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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.
LM36922H
SNVSAF2A – FEBRUARY 2016 – REVISED FEBRUARY 2016
LM36922H Highly Efficient Dual-String White LED Driver
1
1 Features
1
1% Matched Current Sinks Across Process,
Voltage, Temperature
3% Current-Sink Accuracy Across Process,
Voltage, Temperature
11-Bit Dimming Resolution
Up to 90% Solution Efficiency
Drives from One to Two Parallel LED Strings at up
to 38 V at 25 mA per String
PWM Dimming Input
I2C Programmable
Selectable 500-kHz and 1-MHz Switching
Frequency With Optional –12% shift
Auto Switch Frequency Mode (250 kHz, 500 kHz,
1 MHz)
Four Configurable Overvoltage Protection
Thresholds (17 V, 24 V, 31 V, 38 V)
Four Configurable Overcurrent Protection
Thresholds (750 mA, 1000 mA, 1250 mA,
1500 mA)
Thermal Shutdown Protection
Externally Selectable I2C Address Options via
ASEL Input
2 Applications
Power Source for Smart Phone and Tablet
Backlighting
LCD Panels With up to 24 LEDs
3 Description
The LM36922H is an ultra-compact, highly efficient,
two-string white-LED driver designed for LCD display
backlighting. The device can power up to 12 series
LEDs at up to 25 mA per string. An adaptive current
regulation method allows for different LED voltages in
each string while maintaining current regulation.
The LED current is adjusted via an I2C interface or
through a logic level PWM input. The PWM duty cycle
is internally sensed and mapped to an 11-bit current
thus allowing for a wide range of PWM frequencies
with noise-free operation from 50 µA to 25 mA.
Other features include an auto-frequency mode,
which can automatically change the frequency based
on load current in order to optimize efficiency.
The device operates over the 2.5-V to 5.5-V input
voltage range and a –40°C to +85°C temperature
range.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM36922H
DSBGA (12)
1.756 mm × 1.355 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Simplified Schematic
Typical String-to-String Matching vs LED Current


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