REL-1265 -A-A Reliability Report for AME5258 Series Product Approved by Prepared by Amy Shen Eric Chen Quality & Reliability Dept. Manager Quality & Reliability Dept. Engineer Conclusion: The AME5258 series product has successfully met AME’s reliability standard that is required on all AME, Inc products. Furthermore, QRA Dept. of AME, Inc monitors the reliability continuously to make sure that all AME5258 series product will still meet AME’s reliability standard in the future. Table of Contents: Ⅰ、General Description Ⅱ、Product Information Ⅲ、Failures In Time Calculation Ⅳ、Product Reliability Test Result Ⅴ、Package Reliability Test Result Ⅵ、IR-reflow Test Result Ⅰ、General Description: The AME5258 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.2V, 1.8V, 2.5V and 3.3V. Supply current with no load is 300µA and drops to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the AME5258 ideally suited for single Li-Ion battery- powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. At very light load, the AME5258 will automatically skip pulses in pulse skip mode operation to maintain output regulation. The AME5258 is simple to use. As with standard LDO's,Input and output capacitor are required. The only other element is a small, low cost, 2.2µH inductor.Low output voltages are easily supported with the 0.6V feedback reference voltage. And 100% duty cycle when Vin Ⅱ、Product Information: Ⅲ、Failures In Time Calculation: Use HTOL test information mentioned in sectionⅣ, FIT (Failures In Time) can be calculated as below: FIT = ( x 2 (ν , CL ) × 10 9 ) /( 2 × S × H × AF ) = ( 4 .61 × 10 9 ) /( 2 × 77 × 1000 × 280 .59 ) =106.69 (pieces per 109 hours) @ 40℃ with 90% Confidence Level. Where AF is acceleration factor setting activation energy to 1.0eV as zero failure. Ⅳ、Product Reliability Test Result: Test Item Test Condition Sample Size / Failures HTOL TSTRESS=125℃ 77 pcs / 0 pcs Result Pass Duration=1000hrs Biased, Read at 168/504/1000 hours ESD Human Body Model 3 pcs per pin pair / 0 pcs Pass 3 pcs per pin pair / 0 pcs Pass 3 pcs per pin pair / 0 pcs Pass Pin-to-Pin test Level 2, 2kV minimum Machine Model Pin-to-Pin test Level B, 200V minimum Charged Device Model Level II, 200V minimum Latch-up Level 3, 100mA minimum 3 pcs per pin pair / 0 pcs Pass Ⅴ、Package Reliability Test Result: Test Item Test Condition Sample Size / Failures Result MSL 85/85 168 hours 22 pcs / 0 pcs Level 1 45 pcs / 0 pcs Pass 45 pcs / 0 pcs Pass 45 pcs / 0 pcs Pass 45 pcs / 0 pcs Pass 5 pcs / 0 pcs Pass IR-reflow 3 cycles Peak Temp.= 260℃ (lead-free) IPC/JEDEC J-STD-020D HTS Precondition NOTE 2 Temp.=150℃ Duration=1000 hours Unbiased, Read at 168/504/1000 hours THT Precondition NOTE 2 Temp.=85℃, R.H.=85% Duration=1000 hours Unbiased, Read at 168/504/1000 hours PCT Precondition NOTE 2 Temp.=121℃, R.H.=100% 15PSIG, Unbiased Duration=168 hours Read at 168 hours TCT Precondition NOTE 2 -65℃ ~ 150℃ 1000 cycles Unbiased, Read at 500/1000 cycles Solderability Temp.=245℃ (lead-free) Duration=5sec NOTE 2: 85/85 168 hours + IR-reflow 3 cycles with Peak Temp.= 260℃ (lead-free). Ⅵ、IR-reflow Test Result: Test Item Test Condition Sample Size / Failures Result IR-reflow See IR reflow Profile 22 pcs / 0 pcs Pass Perform 3 cycles test Classification Reflow Profiles Profile Feature Preheat & Soak Temperature min (Tsmin) Temperature max (Tsmax) Time (Tsmin to Tsmax) (ts) Average ramp-up rate (Tsmax tp Tp) Liquidous temperature (TL) Time at liquidous (tL) Peak package body temperature (Tp) Time (tp) within 5 ℃ of the specified Classification temperature (Tc) Average ramp-down rate (Tp to Tsmax) Time 25 ℃ to peak temperature Classification Profile Pb-Free Assembly 150 ℃ 200 ℃ 60-120 seconds 3 ℃/second max. 217 ℃ 60-150 seconds 260 ℃ 30 seconds min. 6 ℃/second max. 8 minutes max.