LM3633 Datasheet, PDF (1/59 Pages) Texas Instruments – Complete Lighting Power Solution for Smartphone Handsets

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LM3633
SNVS867 – JUNE 2014
LM3633 Complete Lighting Power Solution for Smartphone Handsets
Check for Samples: LM3633
1 Features
•1 Drives Three Parallel High-Voltage LED Strings
for Display and Keypad Lighting
• High-Voltage Strings Capable of up to 40-V
Output Voltage and up to 90% Efficiency
• Up to 30-mA per Current Sink (Both Backlight and
Indicator)
• 11-Bit High-Voltage LED Dimming
• PWM Input for Content Adjustable Brightness
Control (CABC)
• Integrated 1-A/40-V MOSFET
• Adaptive Boost Output to LED Voltages
• Six Low-Voltage Current Sinks for Indicator LEDs
• Integrated Charge Pump for Improved Efficiency
and V_IN Operating Range
• Internal Pattern Generation Engine for Each
Indicator LED
• Fully Configurable LED Grouping and Control
• Four Programmable Overvoltage Protection
Thresholds (16 V, 24 V, 32 V, and 40 V)
• Programmable 500-kHz and 1-MHz Switching
Frequency
• Overcurrent Protection
• Thermal Shutdown Protection
• 27 mm² Total Solution Size
2 Applications
• Power Source for Smart Phone Illumination
• Display, Keypad and Indicator Illumination
• RGB Indicator Driver
space
Simplified Schematic
L
D1
2.7V to 5.5V
VIN
CIN
VOUT up to 40V
COUT
SDA
SCL
HWEN
PWM
IN
SW
OVP
LM3633 ^C+
C-
SDA
SCL
HWEN
HVLED1
HVLED2
HVLED3
CPOUT
PWM
PGND
LVLED1
LVLED2
LVLED3
LVLED4
LVLED5
LVLED6
CP
CPOUT
3 Description
The LM3633 11-bit LED driver provides high-
performance backlight dimming for 1, 2, or 3 parallel
high-voltage LED strings while delivering up to 90%
efficiency. The boost converter with integrated 1-A,
40-V MOSFET automatically adjusts to LED forward
voltage to minimize headroom voltage and effectively
improve LED efficiency.
The LM3633 is a complete power source for
backlight, keypad, and indicator LEDs in smartphone
handsets. The high-voltage inductive boost converter
provides the power for three parallel LED strings
(HVLED1, HVLED2 and HVLED3). The integrated
charge pump provides the bias for the six low-voltage
indicator LEDs (LVLED1-LVLED6). All low-voltage
current sinks can have a programmable pattern
modulated onto their output current for a wide variety
of blinking patterns.
An additional feature is a Pulse Width Modulation
(PWM) control input for content adjustable backlight
control, which can be used to control any high-
voltage current sink.
The LM3633 is fully programmable via an I²C-
compatible interface. The device operates over a 2.7-
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)
LM3633
DSBGA (20)
2.04 mm x 1.78 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Dual String Efficiency vs V_IN
92%
L=22µH, f_SW=1MHz
90%
88%
86%
84%
82%
80%
78%
76%
74%
72%
70%
2.5 3 3.5 4 4.5
VIN (V)
3s3p
4s3p
5s3p
6s3p
5 5.5
C002
1
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.