The RT4832 is an integrated total power solution for Flash LED Driver, Backlight WLED Driver, and DSV Driver. Flash LED Driver provides up to 2-CH 1.5A applications. Back Light WLED Driver supports up to 36V output for 10 WLEDs applications. And it provides 1024 steps LED current with logarithmic/linear curve. DSV is implemented by one single inductor boost and inverting charge pump, which provide customers minimum EVB area compared to dual inductors. The negative output power (CPOUT) comes from boost output (LCMOUT). It also provides DSV positive voltage (POS), which power noise is reduce by passing though LDO. Their ranges can be programmed from ±4V to ±6V per 50mV step respectively. Flash Boost Converter operates at 2MHz/4MHz frequency. The 4MHZ frequency solution allows tinny and low-profile components. Torch Mode Current can be set from 25mA to 375mA per 25mA step. And Strobe Mode Current range is from 100mA to 1.5A per 100mA step.

DSV drives TFT-LCD panels up to 10” (from SFF to MFF like tablets). These two output rails are usually connected to Source Driver IC. Wide input voltage range from 2.5V to 5.5V optimizes the single-cell battery applications (Li-Ion, Ni-Li, Li-Polymer) and which symmetrical output current is up to 80mA.

The RT4832 provides complete protection such as VIN under voltage lockout, Vin monitor protection, over current protection, over voltage protection, LED short protection, VOUT short protection and over temperature protection.

The RT4832 is available in WL-CSP-30B 2.24x2.64 (BSC) package.

应用

Smart Phones

Probable Instruments

关键特性

Input Voltage Range : 2.5V to 5.5V

Internal Soft-start, UVLO, OTP, OCP

Typical Shutdown Current : < 1μA

-40 to 85°C Temperature Range

2CH Back Light LED Driver

Drives Up to 10 WLEDs in Two Strings

External PWM Pin Control and I2C Programmable 11 bit Linear and Exponential Brightness

LED Current Accuracy ±5% (> 500μA), ±3% (> 5mA)

I2C Programmable OVP 18/22/25/29/33/36V

2CH Flash LED Driver

Torch Mode Current from 25mA to 375mA per 25mA Step with 2 Channels

Strobe Mode Current from 100mA to 1.5A per 100mA Step with 2 Channels

I2C Programmable Flash Safety Timer from 32ms to 1024ms per 32ms Step

High Accurate Safety Timer ±10%, Current Accuracy ±4% (>375mA), Current Matching ±7% (>375mA)

VIN Monitor Protection from 2.5V to 3.2V per 0.1V Step

Selectable Input Current Limit 1.9/2.8A

2MHz/4MHz Switching Frequency for Flash LED

Flash LED1/2 Short Protection, and Output Short Protection

Txmask Protection by Independent Pin

DSV

I2C Programmable Output Voltages

Flexible Boost Voltage, POS, CPOUT Default Setting

Regulated Voltage Output : 4V to 6V per 50mV Step

Positive Voltage Output : 4 to 6V per 50mv Step

Negative Voltage Output : -4 to -6V per 50mV Step

User Selectable Output Fast Discharge Mode or Float Mode when Turned Off

Independent Positive and Negative Enable Control by Two External Pins

True Load Disconnect, OCP, and Positive/Negative SCP Function