| Number of channels (#) | 3 |
| Vin (Min) (V) | 2.7 |
| Vin (Max) (V) | 5.5 |
| Vout (Min) (V) | 0 |
| Vout (Max) (V) | 40 |
| Type | Inductive |
| Switching frequency (Max) (kHz) | 500 |
| LED current per channel (mA) | 30 |
| Peak efficiency (%) | 89 |
| Topology | Boost |
| Features | OVP |
| Operating temperature range (C) | -40 to 125 |
- Drives up to 3 Parallel High-Voltage LED Strings
at 40 V Each With up to 90% Efficiency - 0.4% Typical Current Matching Between Strings
- 256 Level Logarithmic and Linear Brightness
Control With 14-Bit Equivalent Dimming - I2C-Compatible Interface
- Direct Read Back of Ambient Light Sensor Via
8-bit ADC - Programmable Dual Ambient Light Sensor Inputs
With Internal Sensor Gain Selection - Dual External PWM Inputs for LED Brightness
Adjustment - Independent Current String Brightness Control
- Programmable LED Current Ramp Rates
- 40-V Overvoltage Protection
- 1-A Typical Current Limit
The LM3532 is a 500-kHz fixed frequency asynchronous boost converter which provides the power for 3 high-voltage, low-side current sinks. The device is programmable over an I2C-compatible interface and has independent current control for all three channels. The adaptive current regulation method allows for different LED currents in each current sink thus allowing for a wide variety of backlight and keypad applications.
The main features of the LM3532 include dual ambient light sensor inputs each with 32 internal voltage setting resistors, 8-bit logarithmic and linear brightness control, dual external PWM brightness control inputs, and up to 1000:1 dimming ratio with programmable fade in and fade out settings.
The LM3532 is available in a 16-pin, 0.4-mm pitch thin DSBGA package. The device operates over a 2.7-V to 5.5-V input voltage range and the ?40°C to +85°C temperature range.
