SY8047QDC

SY8047 Ultra Low Quiescent Current 1.25MHz, 4A Synchronous Step Down Regulator General Description Features SY8047 is a high efficiency ultra low quiescent current, 1.25MHz synchronous step-down DC-DC regulator IC capable of delivering up to 4A output current. SY8047 operates over a wide input voltage range from 2.5V to 5.5V and integrates main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss.           Ordering Information Input voltage range: 2.5V to 5.5V 1.25MHz switching frequency Max output current: 4.0A Peak current mode control for the fast transient speed 100% drop out function Typical 18uA quiescent current Low RDS(ON) for internal switches (PFET/NFET): 75mΩ/55mΩ Hic-cup mode protection for hard short condition RoHS Compliant and Halogen Free Compact package: QFN3x3-16 SY8047 □(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number Package Type SY8047QDC QFN3x3-16 Applications     Note 4A Set Top Box Net PC Mini-Notebook PC Access Point Router Typical Applications Efficiency vs. Load Current 96 94 L1: 1.0uH VIN:2.5V to 5.5V RH 100k SVIN 1uF SY8047 FB 100k ON/ OFF SS RL 49.9k CSS:1nF EN PGND AGND Cff 22pF COUT: 22uF/6.3Vx2 Efficiency (%) 10Ω PG 92 LX PVIN CIN: 22uF/6.3V VOUT:1.8V 90 88 86 VIN=3.3V,VOUT=1..8V VIN=4.2V,VOUT=1.8V VIN=5.0V,VOUT=1.8V 84 82 80 1 10 100 1000 10000 Load Current (mA) Figure 1. Schematic Diagram SY8047 Rev.0.9 © 2018 Silergy Corp. Figure 2. Efficiency Figure Silergy Corp. Confidential-Prepared for Customer Use Only 1 All Rights Reserved. SY8047 NC 3 PG 4 EN PGND PGND 13 Exposed Thermal Pad 12 PVIN 11 PVIN 10 SVIN 9 5 6 7 SS 8 NC 2 14 NC LX 15 AGND 1 16 FB LX NC Pinout (top view) ① Part Number Package type Top Mark SY8047QDC QFN3x3-16 VJxyz Note① ： x=year code, y=week code, z= lot number code. Pin Name LX NC Pin Number 1, 2 3, 7, 8, 16 PG 4 FB 5 AGND 6 SS 9 SVIN 10 PVIN 11, 12 EN PGND 13 14, 15 Pin Description Inductor pin. Connect this pin to the switching node of inductor No connection Power good indicator(Open drain output). Low if the output < 90% of regulation voltage; High otherwise. Connect a pull-up resistor to the input. 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=0.6V*(1+RH/RL). Analog ground pin. Soft-start programming pin. Do not float this pin. Connect a capacitor from this pin to ground to program the soft-start time. tSS=Max(60µs, CSS×0.6V/1.6µA). Supply voltage for control circuit. Decouple this pin to ground with at least 1uF ceramic cap. Supply voltage for power circuit. Decouple this pin to ground with at least 22uF ceramic cap. Enable input pin. Integrated 4MΩ pull down resistor. Power ground pin. Absolute Maximum Ratings (Note 1) All pins --------------------------------------------------------------------------------------------------------------------------- 6V Power Dissipation, PD @ TA = 25°C, QFN3x3---------------------------------------------------------------------------- 2.6W Package Thermal Resistance (Note 2) θ JA --------------------------------------------------------------------------------------------------------------- 38°C/W θ JC ---------------------------------------------------------------------------------------------------------------- 8°C/W 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 ----------------------------------------------------------------------------------------------- 2.5V to 5.5V Junction Temperature Range ----------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------------ -40°C to 85°C SY8047 Rev.0.9 © 2018 Silergy Corp. Silergy Corp. Confidential-Prepared for Customer Use Only 2 All Rights Reserved. SY8047 Electrical Characteristics (VIN = 5V, VOUT = 2.5V, L = 1.0uH, COUT = 22uFx2, TA = 25°C, unless otherwise specified) Parameter Input Voltage Range Quiescent Current Shutdown Current Feedback Reference Voltage PFET RON NFET RON Peak Current Limit EN rising threshold EN falling threshold Input UVLO threshold UVLO hysteresis Oscillator Frequency PGOOD Under-voltage Threshold Short Circuit Protection Threshold Min ON Time Symbol VIN IQ ISHDN VREF RDS(ON),P RDS(ON),N ILIM VENH VENL VUVLO VHYS FOSC VFB,LV VSCP Test Conditions 0.15 1.25 0.55 0.26 80 Unit V µA µA V mΩ mΩ A V V V V MHz V V ns Soft Start Current ISS TSS  1.6 µA Soft Start time Output Discharge Switch On Resistance Thermal Shutdown Temperature Thermal Shutdown Hysteresis TSS CSS=1nF 400 µs RDSC 50 Ω TSD THYS 150 15 °C °C IOUT=0, VFB=VREF  105% EN=0 Min 2.5 0.591 Typ 18 0.1 0.6 75 55 Max 5.5 1 0.609 5 1.5 0.4 2.5 IOUT=500mA 0.6V  CSS I SS 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. 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. Note 3: The device is not guaranteed to function outside its operating conditions. SY8047 Rev.0.9 © 2018 Silergy Corp. Silergy Corp. Confidential-Prepared for Customer Use Only 3 All Rights Reserved. SY8047 Block Diagram SVIN Internal Power PVIN Input UVLO 2.5V Current limiting Sensor EN 1.5V LX Control Logic + FB SS PG SY8047 Rev.0.9 © 2018 Silergy Corp. - 0.6V Internal SST GND Thermal Sensor Silergy Corp. Confidential-Prepared for Customer Use Only 4 All Rights Reserved. SY8047 QFN3x3-16 Package outline & PCB Layout Top View PC B layout (Recommended) Side View Detail A Pin1 identifier: two options Bottom View Notes: All dimension in millimeter and exclude mold flash & metal burr. SY8047 Rev.0.9 © 2018 Silergy Corp. Silergy Corp. Confidential-Prepared for Customer Use Only 5 All Rights Reserved. SY8047 Taping & Reel Specification 1. QFN3x3-16 taping orientation 3.9/4.1 11.7/12.3 1.45/1.55 Feeding direction 2. Carrier Tape & Reel specification for packages Reel Size Package types QFN3x3 Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel 12 8 13" 400 400 5000 3. Others: NA SY8047 Rev.0.9 © 2018 Silergy Corp. Powered by TCPDF (www.tcpdf.org) Silergy Corp. Confidential-Prepared for Customer Use Only 6 All Rights Reserved.