AME5258

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.