RT4832A Datasheet, PDF (1/26 Pages) Richtek Technology Corporation – Sub PMIC with Dual-Output Boost Converter

RT4832A
Sub PMIC with Dual-Output Boost Converter with I²C
Interface for Flash LED and Backlight LED, Dual-Output LCD
Bias and DSV
General Description
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.
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 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.
The RT4832A is available in WL-CSP-30B 2.24x2.64
(BSC) package.
Applications
 Smart Phones
 Probable Instruments
Features
 Input Voltage Range : 2.5V to 5.5V
 Internal Soft-start, UVLO, OTP, OCP
 Typical Shutdown Current : < 1A
 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% (>500A), 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
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
DS4832A-00 January 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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