SY8891EARC

Application Note: SY8891E High Efficiency, 1.5MHz, 5.5V/1A Synchronous Step Down Regulator Features         SY8891E is in a space saving, low profile SOT563 package. Ordering Information SY8891 □(□□)□ Temperature Code Package Code Optional Spec Code  dF Note --  USB Dongle  Media Player  Smart Phone Set Top Box rep are Package type SOT563 Applications de nti a lP Ordering Number SY8891EARC RO N  2.5V to 5.5V Input Voltage Range. Low RDS(ON) for Internal Switches (top/bottom) 170mΩ /100mΩ High Switching Frequency 1.5MHz Minimizes the External Components Internal Soft-start Limits the Inrush Current 100% Dropout Operation Forced PWM Operation Power Good Indicator Hic-cup for Short Circuit Protection Output Auto Discharge Function RoHS Compliant and Halogen Free Compact Package: SOT563 IR IT   SY8891E is a high efficiency 1.5MHz synchronous step down DC/DC regulator, capable of delivering up to 1A output current. It can operate over a wide input voltage range from 2.5V to 5.5V and integrate main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss. or K General Description Typical Application RH 100k .C RPG 100k PG FB yC erg Inductor and COUT Selection Table Sil L [µH] 1.5 2.2 1.5 2.2 2.2 1.2 1.8 3.3 4.7 COUT [µF] 10 √ ☆ √ ☆ ☆ Figure1. Schematic Diagram AN_SY8891E Rev. 0.9B © 2020 Silergy Corp. Efficiency vs. Output Current (IOUT=0~1A, L=2.2μH/0420CDMCCDS-2R2MC) 100 COUT Cff 22pF 10μF/6.3V 90 80 RL 49.9k GND VOUT [V] VOUT:1.8V Efficiency (%) EN ON/ OFF orp CIN 10μF/6.3V LX VIN on fi L1:2.2µH VIN: 2.5-5.5V 22 √ √ √ √ √ 70 60 50 40 VIN=3.3V,VOUT=1.8V 30 VIN=4.2V,VOUT=1.8V VIN=5.0V,VOUT=1.8V 20 10 0.001 0.01 0.1 Output Current (A) Figure2. Efficiency vs. Output Current Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. 1 SY8891E PG EN LX 6 5 4 1 2 3 FB GND VIN RO N Pin out (Top View) IR IT Top Mark: E2 xyz (device code: E2, x=year code, y=week code, z= lot number code) Pin Description Pin Number FB 1 GND 2 VIN 3 LX EN 4 5 PG 6 Pin Description Output 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=0.6×(1+RH/RL). Ground pin. Input pin. Decouple this pin to GND pin with at least a 10µF ceramic capacitor. Inductor pin. Connect this pin to the switching node of inductor. Enable control. Pull high to turn on. Do not leave it floating. Power good indicator. 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. de nti a lP rep are dF or K Pin Name Input UVLO IN Current Sense orp .C Internal Power on fi Function Block EN LX yC 1.2V 0.6V Sil erg FB OVP 120%VREF Control Logic Soft Start GND Thermal Detect PG Figure3. Block Diagram AN_SY8891E Rev. 0.9B © 2020 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY8891E Absolute Maximum Ratings (Note 1) RO N Supply Input Voltage----------------------------------------------------------------------------------------------- -0.3V to 6.0V FB, EN, PG Voltage----------------------------------------------------------------------------------------- -0.3V to VIN + 0.6V LX Voltage----------------------------------------------------------------------------------------- -0.3V (*1) to 6.0V (*2) (*3) Power Dissipation, PD @ TA = 25°C --------------------------------------------------------------------------------------- 0.95W Package Thermal Resistance (Note 2) θ JA --------------------------------------------------------------------------------------------------------------- 105°C/W θ JC ---------------------------------------------------------------------------------------------------------------- 30°C/W dF Recommended Operating Conditions (Note 4) or K IR IT 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