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.
| 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 |
| Duty cycle (max) (%) | 94 |
| LED current per channel (mA) | 30 |
| Peak efficiency (%) | 89 |
| Topology | Boost |
| Features | OVP |
| Operating temperature range (°C) | -40 to 125 |
| Rating | Catalog |
| DSBGA (YFQ) | 16 | 3.24 mm² 1.8 x 1.8 |
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