SY8842QWC

SY8842 High Efficiency 2.0MHz, 1.5A Synchronous Step Down Regulator General Description Features SY8842 is a high efficiency 2.0MHz synchronous step down DC/DC regulator capable of delivering up to 1.5A output currents. It can operate over a wide input voltage range from 2.6V to 5.5V and integrate main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss.      Low output voltage ripple, small external inductor and capacitor sizes are achieved with 2.0MHz switching frequency.     Ordering Information  SY8842 □(□□)□ Applications Temperature Code Package Code Optional Spec Code Ordering Number SY8842QWC Package Type QFN1.5×1.5-7 2.6~5.5V Input Voltage Range 55µA Low Quiescent Current Ultra Fast Load Transient Speed Low RDS(ON) for Internal Switches (Top/Bottom) 180mΩ /100mΩ High Switching Frequency 2.0MHz Minimizes the External Components Internal Soft-start Limits the Inrush Current Power Good Indicator Output Auto Discharge Function RoHS Compliant and Halogen Free Compact Package: QFN1.5×1.5-7   Note ----   Smart Phone Net PC Mini-notebook PC Access Point Router Typical Application Efficiency vs. Output Current 96 94 VIN : 2.6V~5.5V 5 RPG: 100k CIN 10µF/6.3V 3 L：1.0µH IN LX PG OUT 4 FB EN GND 7 2 92 VOUT:1.8V 6 RH: 100k 1 RL : 49.9k COUT 22µF/6.3V Efficiency (%) SY8842 90 88 86 84 82 VIN=3.3V,VOUT=1.8V VIN=4.2V,VOUT=1.8V VIN=5.0V,VOUT=1.8V 80 78 0.001 0.01 0.1 1 1.5 Output Current (A) Figure1. Schematic Diagram SY8842 Rev. 0.9B © 2018 Silergy Corp. Figure2. Efficiency vs. Output Current Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY8842 Pin out (Top View) FB 1 7 GND OUT 2 6 LX 3 4 5 PG EN IN (QFN1.5×1.5-7) Top Mark: aQxyz (device code: aQ, x=year code, y=week code, z= lot number code) Pin Name Pin Number Pin Description FB 1 Feedback pin. Connect this pin to the center point of the output resistor divider (as shown in Figure 1) to program the output voltage: VOUT=0.6V× (1+RH/RL) OUT 2 Output feedback pin, connect to the output capacitor side. PG 3 Power good indicator (open drain output). Low if the output < 90% or the output >120% of regulation voltage; High otherwise. Connect a pull-up resistor to the input. EN 4 Enable control. Pull high to turn on. Do not leave it floating IN 5 Input pin. Decouple this pin to GND pin with at least a 10µF ceramic cap. LX 6 Inductor pin. Connect this pin to the switching node of inductor. GND 7 Ground pin. SY8842 Rev. 0.9B © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY8842 Block Diagram IN Internal Power Input UVLO Current Sensor EN LX - FB + 0.6V Control Logic OUT Current Sensor GND Soft Start PG Thermal Sensor Figure3. Block Diagram Absolute Maximum Ratings (Note 1) Supply Input Voltage ------------------------------------------------------------------------------------------------------- 6.0V EN, PG, OUT, FB Voltage--------------------------------------------------------------------------------------------- VIN + 0.6V （ ） （ ） LX Voltage -------------------------------------------------------------------------------------------------- -0.3V *1 to 6V *2 Power Dissipation, PD @ TA = 25°C, QFN1.5×1.5-7 ----------------------------------------------------------------------------------------------------- 1.4W Package Thermal Resistance (Note 2) θ JA --------------------------------------------------------------------------------------------------------------- 70°C/W θ JC ---------------------------------------------------------------------------------------------------------------- 8°C/W Junction Temperature Range ---------------------------------------------------------------------------------- -40°C to 150°C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------- -65°C to 150°C (*1) LX Voltage Tested Down to -3V