RT4832A
Sub PMIC with Dual-Output Boost Converter with I2C
Interface for Flash LED and Backlight LED, Dual-Output LCD
Bias and DSV
Features
General Description
Input Voltage Range : 2.5V to 5.5V
Internal Soft-start, UVLO, OTP, OCP
Typical Shutdown Current : < 1A
40 to 85°C Temperature Range
2CH Back Light LED Driver
The RT4832A 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.
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% (>500A), 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)
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.
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
The RT4832A 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.
Txmask Protection by Independent Pin
DSV
I2C Programmable Output Voltages
Flexible Boost Voltage, POS, CPOUT Default
Setting
The RT4832A is available in WL-CSP-30B 2.24x2.64
(BSC) package.
Regulated Voltage Output : 4V to 6V per 50mV
Step
Applications
Smart Phones
Positive Voltage Output : 4 to 6V per 50mv Step
Negative Voltage Output : 4 to 6V per 50mV
Step
Probable Instruments
User Selectable Output Fast Discharge Mode or
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS4832A-00 January 2017
www.richtek.com
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