LoRhoSMD PPTC for Charging Cable Protection/media/electronics/product_presentation… · LoRhoSMD...
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1 1 LoRho SMD PPTC for Charging Cable Protection New Product Introduction April 2017
Transcript of LoRhoSMD PPTC for Charging Cable Protection/media/electronics/product_presentation… · LoRhoSMD...
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LoRho SMD PPTC for Charging Cable ProtectionNew Product IntroductionApril 2017
2Confidential and Proprietary | Littelfuse, Inc. © 2017 2Confidential and Proprietary | Littelfuse, Inc. © 2017
LoRho SMD PPTC for Charging Cable ProtectionProduct Brief§ Protects connectors from
over-heating§ Place on Vbus line§ Sense over-heating and
prevent charging until contamination is removed
§ For charging cables & connectors such as:– USB-C– microUSB
§ Causes of heat include:– Dust, – Dirt, or – Water
§ Maximum electrical rating: – 12Vdc– Up to 4.5A
§ 1206/1210 sizes save board space in USB connector
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Features and Benefits
Features BenefitsSMD compatible with reflow soldering process
Reduce assembly time and cost compared to other form factors
Available in small 1206and 1210 sizes
Save PCB space at USB-C connector and ensure USB-C plug meets USB-IF dimension specifications
Up to 12Vdc and4.5A Ihold
Available for fast charging
Ultra low internalresistance Less power loss and more efficient charging
Automatically reset No replacement needed after fault removed
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Thermal Events of Smart Phone During ChargingAs charging current increases, the incidents of thermal runaway are happening more frequently at charging port side.
Finding an economical protection solution to such events is important at initial design stage
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Root Cause Analyze of USB Connector Damage
Vbus
GND
Charging cable & microUSB connector
Mobile phone female microUSB connectorA
DamageExperienced
Possible Failure Locations Cause
Connector Damaged due to significant heat
(I2R)
Contact FailureContactor contamination,deformation, wearing, rust, etc
Between Vbus and GND
Small external items entering connector; metal particles, hair, fur, liquid, etc.
B
A
A
B
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Over-temperature Protection Using PTCR: Contact resistance increased due to contamination/deformation at contact pinsi: Charging current increased to 3A/5A for USB Type-Ci2R: Heat generated from contact pins
PTC inside USB plug
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Comparison
Part Number V_max(V)
I_hold20°C (A)
I_hold60°C (A)
R1_max(Ω) Footprint
nanoSMD350LR 6 3.5 1.9 0.018 1206
microSMD450LR 5 4.5 3.2 0.008 1210
nanoSMD500LR 6 5.0 3.7 0.008 1206
nanoSMD350LR-C 12 3.5 1.9 0.018 1206
nanoSMD400LR-C 12 4.0 2.8 0.010 1206
microSMD450LR-C 12 4.5 3.3 0.0085 1210
NEW!
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Applications and Markets
§ ApplicationsCharging cables and connectors with small pin pitch (pin-to-pin dimensions) such as microUSB and USB-C. This is especially important in fast charging applications which have higher voltages and currents.
§ Markets1. Smartphone2. Tablet PC3. Laptop PC4. TV and Set Top Box5. Camera, Video Game Console
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Electrical Specifications
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Dimensions
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Part Numbering System
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Pricing, Samples, Availability and ContactsPricing and Samples For pricing and samples availability, please contact Littelfuse product management and sales representatives.
Production Availability Production lead-time: 6-8 weeksPackaging: Tape & ReelMinimum pack quantity: 3,000 piecesMinimum order quantity: 15,000 pieces
Contacts Product Manager: Vincent Wu, email: [email protected]. Product Manager: Justin Xu, email: [email protected] Engineer: Ellen Li, email: [email protected]
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Sales Tools and Contact Information§ Current datasheets are available on www.littelfuse.com§ Application and Technical Support: 1-800-999-9445
