SY6875ADBC

Application Notes: AN_SY6875A Programmable Current Limit Switch 矽力杰一级代理商，服务热线：13612957917 蓝先生 技术支持热线，QQ：455854573 Features SY6875A is a programmable current limit switch with input voltage range selection and output voltage clamping. Extremely low RDS(ON) of the integrated protection N-channel FET helps to reduce power loss during the normal operation. Programmable soft-start time controls the slew rate of the output voltage during the start-up time. Independent enable control allows the complicated system sequencing control. It integrates the over-temperature protection shutdown and autorecovery with hystersis. This IC along with small DFN3X3-10 footprint provides small PCB area application. • Wide Input Voltage Range from 2.5V to 15V with surge up to 30V • Extremely Low RDS(ON) for the Integrated Protection Switch: 40 mΩ • Programmable Soft-Start Time • Programmable Current Limit • Short-circuit Protection • Selectable Input Range and Clamping Output Voltage Threshold. • Enable Interface Pin • Thermal Shutdown Protection & Auto Recovery • RoHS Compliant and Halogen Free • Compact package: DFN3X3-10 ar ed fo rH SX General Description Ordering Information Applications Temperature Code Package Code Optional Spec Code Package type DFN3x3-10 Note ---- • • • • Notebook PC I-pad Mini Server Service PC .C on fid en Ordering Number SY6875ADBC tia l-P re p SY6875 □(□□)□ Sil er gy Co rp Typical Applications Figure 1. Schematic Diagram AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 1 AN_SY6875A Pinout (top view) rH SX (DFN3x3-10) Top mark: FNxyz for SY6875A (Device code: FN, x=year code, y=week code, z= lot number code) Pin Name Pin Number Pin Description GND 11(exposed paddle) OUT ILIM 8,9,10 5 SST 6 EN VCP 7 4 Power input pin. Decouple high frequency noise by connecting at least 0.1uF MLCC to ground. Ground pin. fo 1,2,3 Power output pin. Current limit program pin. Program the current limit by connecting a resister to ground. Soft-start time program pin. Connect a capacitor to ground to program the soft start time. Enable interface pin. Pull it High to enable the IC. Output clamp voltage selection based on the input voltage. Pull VCP pin to High by connecting a resistor to IN, or pull VCP pin to Low by connecting a resistor to ground, or float VCP Pin to select different output clamping thresholds. Recommend to decoupling this pin with 0.1uF capacitor. Clamping Threshold VCP IN Min Typ Max Low 3.3V Over 4V 3.6V 3.8V 4.0V High 5V Over 6V 5.4V 5.7V 6.0V Open 12V Over 14V 12.6V 13.3V 14V Co rp .C on fid en tia l-P re p ar ed IN Sil er gy Block Diagram AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 2 AN_SY6875A Absolute Maximum Ratings (Note 1) Supply Input Voltage ----------------------------------------------------------------------------------------- 30V EN pin, VCP pin, ---------------------------------------------------------------------------------------------- 30V Power Dissipation, PD @ TA = 25°C DFN3X3-10, ------------------------------------------------------- 2.6W Package Thermal Resistance (Note 2) θ JA ------------------------------------------------------------------------------------------------------------- 38°C/W θ JC ------------------------------------------------------------------------------------------------------------- 8°C/W SX Junction Temperature Range -------------------------------------------------------------------------------- 125°C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------- 260°C Storage Temperature Range ---------------------------------------------------------------------------------- -65°C to 150°C Recommended Operating Conditions (Note 3) Electrical Characteristics ar ed fo rH Supply Input Voltage ----------------------------------------------------------------------------------------- 2.5V to 15V Junction Temperature Range -------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range ------------------------------------------------------------------------------- -40°C to 85°C (VIN = 5V, RLIM=10kΩ, CSST=105nF, CIN = 10uF, COUT = 10uF, TA = 25°C, unless otherwise specified ) UVLO hysteresis VHYS Co rp Sil er gy Soft-start Time Soft-start Time Accuaracy EN Turn-on Threshold EN Turn-off Threshold Output Discharge Resistor Thermal Shutdown Temperature Thermal Shutdown Hysteresis Min 2.5 2.2 3.4 8.1 0.05 0.06 0.1 EN=0 fid IBIAS ISHDN RDS(ON) VCP=LOW VCP=HIGH VCP=OPEN VCP=LOW VCP=HIGH VCP=OPEN .C on Bias Current Shutdown Current Protection FET RON Current Limit Accuracy Current Limit Program Range Clamping Output Voltage Test Conditions tia l-P re p Symbol VIN VUVLO en Parameter Input Voltage Range Input UVLO Threshold ILIM VCLP TSST VEN_ON VEN_OFF RDIS TSD THYS (Note 5) VCP=LOW VCP=HIGH VCP=OPEN 1 3.6 5.4 12.6 CSST=105nF(Note 4) Typ 0.085 0.095 0.19 200 10 40 30%ILIM 3.8 5.7 13.3 29.4 ±30%TSST Max 30 2.4 3.8 9.0 0.13 0.15 0.29 70 5 4.0 6.0 14.0 2 V µA µA mΩ A V V V ms 30 140 V V Ω °C 20 °C 0.4 EN=’0’ Unit V V V V Note 1: Stresses beyond “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability. AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 3 AN_SY6875A Note 2: θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Test condition: Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane. Note 3. The device is not guaranteed to function outside its operating conditions Note4. Recommended Soft-start Time Program Table SST cap (nF) Rise time (ms) None 1.4 10 2.8 55 15.4 105 29.4 SX Recommended Formula for CSST & Soft-start Time Calculation fo rH TSS _ DLT , No external C SST  , TSS =  C SST , TSS > TSS_DLT  I INT Note5. Recommended Current Limit Program Table 11 1.0 5.5 2.0 4.4 2.5 3.7 3.0 tia l-P re p Current Limit Resistance (kΩ) Current Limit (A) ar ed Where, TSS_DLT is the internally fixed default soft-start time, about 1.4ms, which means there’s no any external CSST; IINT is the internal current source, about 3.6uA. 3.1 3.5 2.8 4.0 2.4 4.5 2.2 5.0 Recommended Formula for RLIM & Current Limit Calculation en 11k (Ω ) . I LIM Sil er gy Co rp .C on fid RLIM = AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 4 AN_SY6875A Typical Performance Characteristics Programmable Soft-start Time ( 3.3V Mode, IO=1A, CSST=100nF) 2.0V/div VOUT IO 2.0V/div SX ILIMIT(A) VIN rH 0.5A/div fo Time (20ms/div) Shutdown ar ed Programmable Soft-start Time ( 5.0V Mode, IO=1A, CSST=100nF) VOUT 2.0V/div IO 0.5A/div en 2.0V/div VIN 2.0V/div VOUT 2.0V/div IO 0.5A/div .C on fid VIN tia l-P re p ( 3.3V Mode, IO=1A, CSST=100nF) Time (10ms/div) Sil er gy Co rp Time (10ms/div) AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 5 AN_SY6875A Shutdown ( 12V Mode, IO=1A, CSST=100nF) VIN 5.0V/div VOUT 0.5A/div rH SX IO 5.0V/div Time (10ms/div) fo Over Voltage Protection VOUT 2.0V/div IO 0.5A/div tia l-P re p 5.0V/div Sil er gy Co rp .C on Time (20ms/div) fid en VIN ar ed ( 5V Mode, VIN=8V, IO=1A) AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 6 AN_SY6875A er gy Co rp .C on fid en tia l-P re p ar ed fo rH SX PCB Layout Guideline Sil Top Silkscreen AN_SY6875A Rev. 0.9 Top Layer Bottom Layer Silergy Corp. Confidential- Prepared for Customer Use Only 7 AN_SY6875A ar ed fo rH SX DFN3x3-10 Package outline PCB layout (recommended) Side View Sil er gy Co rp .C on fid en tia l-P re p Top View Detail A Pin1 identifier: two options Bottom View Notes: All dimensions are in millimeters and exclude mold flash & metal burr. AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 8 AN_SY6875A Taping & Reel Specification 1. DFN3x3-10 taping orientation 3.9/4.1 tia l-P re p Feeding direction ar ed fo rH SX 11.7/12.3 1.45/1.55 2. Carrier Tape & Reel specification for packages .C on fid en Reel Width er gy Co rp Reel Size Sil Package types DFN3x3 Tape width (mm) Pocket pitch(mm) Reel size (Inch) Reel width(mm) Trailer length(mm) Leader length (mm) Qty per reel 10 8 13" 12.4 400 400 5000 3. Others: NA AN_SY6875A Rev. 0.9 Silergy Corp. Confidential- Prepared for Customer Use Only 9