SY8078BDTC

SY8078B High Efficiency 3.0MHz, 0.6A Synchronous Step Down Regulator General Description Features The SY8078B is a high efficiency 3MHz synchronous step down DC/DC regulator IC capable of delivering up to 0.6A output current. It can operate in PFM or CCM mode during light load programed by MODE pin. It can operate over a wide input voltage range from 1.85V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.  1.85~5.5V input voltage range  3MHz switching frequency  40uA low quiescent current  Low RDS(ON) for internal switches (PFET/NFET): 350mΩ/250mΩ  Fixed 100us soft-start time  PFM/CCM operation mode during light load programed by MODE pin  Hic-cup mode protection for hard short condition  RoHS Compliant and Halogen Free  Compact package: DFN1.45x1-6 Ordering Information □(□□)□ Package Type DFN1.45x1-6  Portable Audio, Portable Media  Cell phones  Digital Cameras Note -- l-F or 半 Ordering Number SY8078BDTC Applications 导 小 Temperature Code Package Code Optional Spec Code 芯 SY8078 Typical Applications tia Efficiency vs. Load Current en IN on EN 90 VOUT: 1.2V 85 RH 100k ON/OFF yC Sil erg L:1µH LX FB MODE GND RL 50k Cff 10pF COUT 4.7µF Efficiency (%) fid VIN : 1.85V~5.5V CIN 2.2µF 95 80 75 70 65 VIN=2.0V,VOUT=1.2V VIN=3.3V,VOUT=1.2V VIN=5.0V,VOUT=1.2V 60 55 50 1 10 100 1000 Load Current (mA) Figure 1.Schematic diagram SY8078B Rev. 0.9A © 2018 Silergy Corp. Figure 2. Efficiency vs. Load Current Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SY8078B Pinout (Top View) MODE 1 6 FB LX 2 5 EN VIN 3 4 GND (DFN1.45x1-6) Top Mark: Cxyz for SY8078B (device code: C, x=year code, y=week code, z= lot number code) 2 3 4 5 LX VIN GND EN 6 FB 芯 MODE 导 小 1 Pin Description Mode control pin. MODE=high, selected Force CCM mode operation during light load. MODE=low, selected PFM mode operation during light load. Inductor pin. Connect this pin to the switching node of inductor. Input pin. Decouple this pin to GND pin with at least 2.2uF ceramic cap. Ground pin. Enable control. Pull high to turn on. Do not leave it float. 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=0.4V*(1+RH/RL). 半 Pin Number l-F or Pin Name Absolute Maximum Ratings (Note 1) fid en tia VIN, LX--------------------------------------------------------------------------------------------------------------------- 6.0V Enable, MODE, FB Voltage-------------------------------------------------------------------------------------- VIN + 0.6V Power Dissipation, PD @ TA = 25°C, DFN1.45x1-6 ----------------------------------------------------------------------------------------------- 450mW Package Thermal Resistance (Note 2) yC on θ JA ---------------------------------------------------------------------------------------------------------- 200°C/W θ JC ---------------------------------------------------------------------------------------------------------- 130°C/W Sil erg Junction Temperature Range ------------------------------------------------------------------------------------------- 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C Storage Temperature Range -------------------------------------------------------------------------------- -65°C to 150°C Recommended Operating Conditions (Note 3) Supply Input Voltage ----------------------------------------------------------------------------------------- 1.85V to 5.5V Junction Temperature Range ------------------------------------------------------------------------------ -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------- -40°C to 85°C SY8078B Rev. 0.9A © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SY8078B Electrical Characteristics (VIN = 5V, VOUT = 1.2V, L = 1uH, COUT = 4.7uF, TA = 25°C, unless otherwise specified) Symbol VIN IQ ISHDN VREF VUVLO VHYS RDS(ON),P RDS(ON),N ILIM VENH VENL FOSC Min 1.85 IOUT=0,VFB=VREF × 105% EN=0 0.392 Typ 40 0.1 0.4 Max 5.5 1 0.408 1.85 0.1 350 250 1 1.2 0.4 3 50 100 0.17 150 20 Unit V µA µA V V V mΩ mΩ A V V MHz ns us V °C °C 导 小 TSS VSCP TSD THYS Test Conditions 芯 Parameter Input Voltage Range Quiescent Current Shutdown Current Feedback Reference Voltage Input UVLO threshold UVLO hysteresis PFET RON NFET RON PFET Current Limit EN rising threshold EN falling threshold Oscillator Frequency Min ON Time Soft Start Time Short Circuit Protection Threshold Thermal Shutdown Temperature Thermal Shutdown Hysteresis l-F or 半 Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. en tia Note 2: θ JA is measured in the natural convection at T A = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Sil erg yC on fid Note 3: The device is not guaranteed to function outside its operating conditions. SY8078B Rev. 0.9A © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SY8078B DFN1.45×1-6 Package Outline Drawing Bottom View en tia l-F or 半 导 小 芯 Top View Sil erg yC on fid Side View Notes: All dimension in millimeter and exclude mold flash & metal burr. SY8078B Rev. 0.9A © 2018 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SY8078B Taping & Reel Specification 1. Taping orientation 芯 Feeding direction l-F or 半 导 小 2. Carrier Tape & Reel specification for packages Sil erg yC on fid en tia Reel Size Package types Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel DFN1.45x1 8 4 7" 400 160 3000 3. Others: NA SY8078B Rev. 0.9A © 2018 Silergy Corp. Powered by TCPDF (www.tcpdf.org) Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved.