LM3632A Texas instruments

LM3632A

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LM3632A

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Описание

The LM3632A integrates the WLED drivers for both the backlight of the LCD panel and the camera flash along with the bias power for the LCD panel into one device. The device has all the safety features required in LED drivers with up to 90% efficiency and bias positive/negative power rails achieving 1.5% accuracy. Capable of driving up to 16 backlight LEDs, the device is ideal for small- to medium-size displays. A 1.5-A constant-current LED driver powered by a synchronous boost converter can be used for flash applications. The high-side flash current source allows for grounded cathode LED operation. A high level of integration and programmability allows the LM3632A to address a variety of applications without the need for hardware changes.

Drives up to Two Strings of Typically Eight LEDs
in Series
- Integrated Backlight Boost with 29-V Maximum
  Output Voltage
- Two Low-Side Constant-Current LED Drivers
  with 25-mA Maximum Output Current
Backlight Efficiency Up to 90%
11-Bit Exponential or Linear Dimming
External PWM Input for CABC Backlight
Operation
LCD Bias Efficiency > 85%
Programmable Positive LCD bias, 4-V to 6-V, 50-
mA Maximum Output Current
Programmable Negative LCD bias, –4-V to –6-V,
50-mA Maximum Output Current
1.5-A Flash LED Boost
Flash Efficiency > 85%
2.7-V to 5-V Input Voltage Range

Number of channels	2
Vin (min) (V)	2.7
Vin (max) (V)	5.5
Vout (min) (V)	0
Vout (max) (V)	29.5
Type	Inductive
Switching frequency (max) (kHz)	1100
Duty cycle (max) (%)	94
LED current per channel (mA)	25
Peak efficiency (%)	92
Topology	Boost, Current Sink, Multi-Channel
Features	Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, Integrated Switch, OVP, PWM control, Soft Start
Operating temperature range (°C)	-40 to 85
Rating	Catalog