LM3633 Texas instruments

LM3633

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LM3633

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Описание

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. For all available packages, see the orderable addendum at the end of the datasheet.

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

Number of channels	3
Vin (min) (V)	2.7
Vin (max) (V)	5.5
Vout (min) (V)	0
Vout (max) (V)	41
Type	Inductive
Switching frequency (max) (kHz)	1100
Duty cycle (max) (%)	94
LED current per channel (mA)	30
Peak efficiency (%)	90
Topology	Boost
Features	Adjustable Switch Frequency, Analog Dimming, CABC, Enable/Shutdown, I2C control, Integrated Switch, OVP, Synchronous Rectification, Thermal shutdown
Operating temperature range (°C)	-40 to 85
Rating	Catalog