LM3533 Texas instruments

LM3533

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LM3533

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Описание

The LM3533 is a complete power source for backlight, keypad, and indicator LEDs in smartphone handsets. The high-voltage inductive boost converter provides the power for two series LED strings for display backlight and keypad functions (HVLED1 and HVLED2). The integrated charge pump provides the bias for the five low-voltage indicator LED current sinks (LVLED1 to LVLED5). All low-voltage current sinks can have a programmable pattern modulated onto their output current for a wide variety of blinking patterns. Additional features include a pulse width modulation (PWM) control input for content adjustable backlight control (CABC), and an ambient light sensor interface (ALS) with an internal 8-bit ADC to provide automatic current adjustment based upon ambient light conditions. Both the PWM and ALS inputs can be used to control any high- or low-voltage current sink. The LM3533 is fully programmable via an I2C-compatible interface. The device is available in a 20-pin DSBGA and operates over a 2.7-V to 5.5-V input voltage range and a −40°C to +85°C temperature range.

Drives Two 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)
14-Bit Equivalent Exponential Dimming With 8-Bit
Programmable Backlight Code
Selectable Analog ALS Input with 128
Programmable Gain-Setting Resistors or PWM
ALS Input With Internal Low-Pass Filter
PWM Input for Content Adjustable Brightness
Control
Five Low-Voltage Current Sinks for Indicator LEDs
Integrated Charge Pump for Improved Efficiency
and V_IN Operating Range
Internal Pattern Generation Engine
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
27-mm² Total Solution Size

Number of channels	7
Vin (min) (V)	2.7
Vin (max) (V)	5.5
Vout (min) (V)	2.7
Vout (max) (V)	40
Type	Inductive
Switching frequency (max) (kHz)	1000
Duty cycle (max) (%)	94
LED current per channel (mA)	30
Peak efficiency (%)	88
Topology	Boost
Features	OVP
Operating temperature range (°C)	-40 to 125
Rating	Catalog