SM8102EABC

SM8102E High Efficiency, Fast Response, 2.0A, 18V Input Synchronous Step Down Regulator Advanced Design Specification General Description Features  The SM8102E is a high efficiency, synchronous stepdown DC/DC converter capable of delivering 2A load current. The SM8102E operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.      The SM8102E adopts the instant PWM architecture to achieve fast transient responses for high step down applications. In addition, it operates at pseudoconstant frequency of 500kHz to minimize the size of inductor and capacitor.       Ordering Information SM8102 □(□□)□ Temperature Code Package Code Optional Spec Code Ordering Number SM8102EABC Package type SOT23-6 Low RDS(ON) for Internal Switches (Top/Bottom): 130mΩ/120mΩ 4.5-18V Input Voltage Range 2A Output Current Capability 500kHz Switching Frequency Minimize the External Components Stable with 10µF COUT and 1.5µH Inductor Instant PWM Architecture to Achieve Fast Transient Responses Internal Soft-start Limits the Inrush Current Forced PWM Operation Cycle-by-cycle Peak/Valley Current Limitation Hic-cup Mode Output Short Circuit Protection Thermal Shutdown with Auto Recovery Compact Package SOT23-6 Applications       Note ---- Set Top Box Portable TV DSL Modem LCD TV IP CAM Networking Typical Application CBS 100nF Efficiency vs. Load Current L 4.7uH BS VIN :4.5~18V IN 100 VOUT: 3.3V LX 90 SM8102E EN RH 100k FB GND RL 22.1k Figure1. Schematic Diagram 80 COUT 10uF Efficiency (%) CIN 10uF CFF 47pF 70 60 50 40 30 VIN=5V,VOUT=3.3V Inductor and COUT Selection Table VOUT [V] L [µH] 1.5 3.3 2.2 4.7 3.3 6.8 4.7 COUT [µF] 10 22 √ 1.2 √ ☆ √ √ 3.3 √ ☆ √ √ 5 √ ☆ Note: ‘☆’ means recommended for most applications. SM8102E Rev0.0A © 2019 Silergy Corp. √ 20 VIN=12V,VOUT=3.3V 10 VIN=18V,VOUT=3.3V 0 0.01 0.1 1 10 Load Current (A) Figure2. Efficiency vs. Load Current Silergy Corp. Confidential- Prepared for Customer Use Only 1 All Rights Reserved. SM8102E Pin-out (top view) BS 1 6 LX GND 2 5 IN 4 EN FB 3 (SOT23-6) Top mark: J6xyz (Device code:J6, x=year code, y=week code, z= lot number code) Pin Name Pin Number BS 1 GND 2 FB 3 EN 4 Pin Description Boot-strap pin. Supply high side gate driver. Connect a 0.1µF ceramic capacitor between BS and LX pin. Power ground pin. 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). Enable control. Pull high to turn on. Do not leave this pin floating. IN 5 Input pin. Decouple this pin to GND pin with at least a 10µF ceramic capacitor. LX 6 Inductor pin. Connect this pin to the switching node of inductor. Block Diagram IN Current Sense Internal Power BS Input UVLO 4.35V PWM Control & Protect Logic EN 1.2V FB LX Current Sense 0.6V Internal SST Thermal Protection SM8102E Rev0.0A © 2019 Silergy Corp. GND Silergy Corp. Confidential- Prepared for Customer Use Only 2 All Rights Reserved. SM8102E Absolute Maximum Ratings (Note 1) Supply Input Voltage ------------------------------------------------------------------------------------------------- -0.3V to 19V LX, EN Voltage--------------------------------------------------------------------------------------------- -0.3V to VIN + 0.3V FB, BS-LX Voltage----------------------------------------------------------------------------------------------------- -0.3V to 4V Power Dissipation, PD @ TA = 25°C SOT23-6, ------------------------------------------------------------------------------ 1W Package Thermal Resistance (Note 2) θ JA ---------------------------------------------------------------------------------- ----------------------- 100°C/W θ JC ------------------------------------------------------------------------------------- ---------------------- 25°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 Dynamic LX voltage in 10ns duration (Note3) ---------------------------------------------------- IN+3V to GND-5V Recommended Operating Conditions (Note 3) Supply Input Voltage ---------------------------------------------------------------- --------------------------- 4.5V to 18V Junction Temperature Range ------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------- -40°C to 85°C SM8102E Rev0.0A © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 3 All Rights Reserved. SM8102E Electrical Characteristics (VIN = 12V, VOUT = 3.3V, L = 4.7µH, COUT = 10µF, TA = 25°C, IOUT = 1A unless otherwise specified) Parameter Input Voltage Range Input UVLO Threshold Input UVLO Hysteresis Shutdown Current Feedback Reference Voltage FB Input Current Top FET RON Bottom FET RON EN Rising Threshold EN Falling Threshold Min ON Time Min OFF Time Turn On Delay Soft-start Time Switching Frequency Symbol VIN VUVLO VHYS ISHDN Test Conditions Top FET Current Limit Bottom FET Current Limit Bottom FET Reverse Current Limit Output Under Voltage Protection Threshold Output UVP Delay UVP Hiccup On Time UVP Hiccup Off Time Thermal Shutdown Temperature Thermal Shutdown Hysteresis ILMT,TOP 3 A ILMT,BOT 2 A ILMT,RVS 1 A EN=0 VREF IFB RDS(ON)1 RDS(ON)2 VEN, R VEN, F tON,MIN tOFF,MIN tON,DLY tSS fSW Min 4.5 588 VFB=3.3V Typ 0.3 5 10 Unit V V V µA 600 612 mV 50 nA mΩ mΩ V V ns ns µs ms kHz -50 1.08 0.9 from EN high to LX start switching VOUT from 0 to 100% IOUT=1A 130 120 1.2 1.0 50 100 300 1 500 Max 18 4.35 1.32 1.1 VUVP 0.33 VREF tUVP,DLY tUVP,ON tUVP,OFF 200 1.4 5.2 µs ms ms TSD 150 ˚C THYS 15 ˚C 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 2OZ two-layer Silergy evaluation board. Paddle of SOT23-6 package is the case position for SM8102E θ JC measurement. Note 3: The device is not guaranteed to function outside its operating conditions. SM8102E Rev0.0A © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 4 All Rights Reserved. SM8102E SOT23-6 Package Outline & PCB Layout Design Top View Side View Notes: Side View Recommended Pad Layout All dimension in millimeter and exclude mold flash & metal burr. SM8102E Rev0.0A © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 5 All Rights Reserved. SM8102E Taping & Reel Specification 1. Taping orientation for package Feeding direction 2. Carrier Tape & Reel specification for packages Reel Size Package type Tape width (mm) Pocket pitch(mm) Reel size (Inch) Trailer length(mm) Leader length (mm) Qty per reel SOT23-6 8 4 7" 280 160 3000 3. Others: NA SM8102E Rev0.0A © 2019 Silergy Corp. Silergy Corp. Confidential- Prepared for Customer Use Only 6 All Rights Reserved.