RT9287A

Features:

Boost Converter
  VIN Operating Range : 2.7V to 5.5V
  Up to 85% Efficiency
  22V Internal Power N-MOSFET
  1MHz Switching Frequency
  Built-in Diode
  Digital Dimming with Zero-Inrush
  Input UVLO Protection
  Output Over Voltage Protection
  Internal Soft Start and Compensation
Dual LDO
  Wide Operating Voltage Ranges : 2.7V to 5.5V
  Low-Noise for RF Application
  No Noise Bypass Capacitor Required
  Fast Response in Line/Load Transient
  TTL-Logic-Controlled Shutdown Input
  Low Temperature Coefficient
  Dual LDO Outputs (300mA/300mA)
  Ultra-Low Quiescent Current 27A/LDO
  High Output Accuracy 2%
  Short Circuit Protection
  Thermal Shutdown Protection
  Current Limit Protection
  Short Circuit Thermal Folded Back Protection
RoHS Compliant and 100% Lead (Pb)-Free


Application

Cellular Phones
WLED Driver
PDAs and Smart Phones
Probable Instruments


Pinout




Specifications

Supply Input Voltage, V_IN, V_DD ----------------------------------------------------------------------------------------- −0.3V to 6V
LX Input Voltage ----------------------------------------------------------------------------------------------------------- −0.3V to 22V
Output Voltage, V_OUT ----------------------------------------------------------------------------------------------------- −0.3V to 21V
The Other Pins ------------------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, P_D @ T_A = 25°C
    WDFN-12L 3x3 ------------------------------------------------------------------------------------------------------------- 0.606W
Package Thermal Resistance (Note 4)
    WDFN-12L 3x3, _JA ------------------------------------------------------------------------------------------------------- 165°C/W
    WDFN-12L 3x3, _JC ------------------------------------------------------------------------------------------------------- 8.2°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 2)
    HBM (Human Body Mode) ------------------------------------------------------------------------------------------------ 2kV
    MM (Machine Mode) ------------------------------------------------------------------------------------------------------- 200V


Description

The RT9287A is an integrated solution for WLED and camera power. It contains a boost converter with internal schottky diode to provide WLED power and Dual LDO for the power of camera image sensor.

In the section of boost converter, RT9287A's optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Internal soft start function can reduce the inrush current. The initial current of WLED is set by the external resistor R_SET. The feedback voltage is 250mV.

In the section of DLDO, RT9287A is a dual channel, low noise, and low dropout regulator sourcing up to 300mA at each channel. The part offers 2% accuracy, low dropout voltage (240mV@300mA), and low ground current, only 27A per LDO. The shutdown current is near zero current, which is suitable for battery-power devices. Other features include current limiting, over temperature, output short circuit protection. The part is short circuit thermal folded back protected. RT9287A lowers its OTP trip point from 165°C to 110°C when output short circuit occurs (V_OUT < 0.4V) providing maximum safety to end users.

RT9287A is available in a WDFN-12L 3x3 package.