SLVAE32B August 2018 – December 2023 TPS7H2201-SP

8 Single Event Transient (SET)

SET testing was performed at room temperature, with¹⁴¹Pr with an angle of incidence of 27.3° die for a LET_EFF 75 MeV × cm²/ mg. The V_IN was set to maximum (7-V) and minimum (1.5-V) recommended voltages at maximum load of 6-A and no load. Under these conditions, the die temperature is around 33 °C when loaded to 6-A and 23°C when not loaded. Flux of approximately 10⁵ ions /cm²× s and fluence ≥ 1× 10⁷ ions / cm² were used in each run. The device was also evaluated when the DUT was disabled by using the EN (0-V) and the OVP (1-V) pins by forcing an external voltage into the pins. Not a single upset on Vout or SS was observed during the SET testing at room temperature. A window trigger with ±3% around the output nominal voltage (when the device was enabled) and a ±200 mV (when the device was disabled) was used for the detection of upsets during the characterization.

During the SEL testing, when the device was exposed to a die temperature of 125°C, upsets that create a momentary Soft Start (SS) cycle were observed. Table 8-1 lists the test conditions and results for the SET testing of the TPS7H2201-SP. Worst case observed transient (SET) for V_OUT and SS is shown in Figure 8-1.

The SET cross-section was calculated observed 95% (2σ) confidence interval and combining (or summing) fluences (see Section 11 for discussion of confidence limits). The cross section is classified by die temperature and LET_EFF.

Equation 3.

σ_{S E T} \leq 2.29 \times 10^{- 8} {c m}^{2} / d e v i c e f o r {L E T}_{E F F} = 75 M e V \times {c m}^{2} / m g a n d T_{J} = 33 ° C, 95 % c o n f .

Equation 4.

σ_{S E T} \leq 2.18 \times 10^{- 5} {c m}^{2} / d e v i c e f o r {L E T}_{E F F} = 75 M e V \times {c m}^{2} / m g a n d T_{J} = 125 ° C, 95 % c o n f .

Equation 5.

σ_{S E T} \leq 1.17 \times 10^{- 6} {c m}^{2} / d e v i c e f o r {L E T}_{E F F} = 66.43 M e V \times {c m}^{2} / m g a n d T_{J} = 125 ° C, 95 % c o n f .

Table 8-1 Summary of TPS7H2201-SP SET Results With T = Approximately 25°C and 125°C

Run Number	Unit Number	Temperature (°C)	Ion Type	Angle of Incidence (°)	LET_EFF (MeV × cm² / mg)	Flux (ions / cm² × s)	Fluence (ions / cm²)	VIN (V)	Load	Enabled?	SET Events
8	3	33	Pr	27.3	75	9.94 × 10⁴	2 × 10⁷	7	6	Yes	0
9	3	33	Pr	27.3	75	9.97 × 10⁴	2 × 10⁷	7	0	Yes	0
10	4	33	Pr	27.3	75	1.01 × 10⁵	2 × 10⁷	1.5	6	Yes	0
11	4	33	Pr	27.3	75	1.09 × 10⁵	2 × 10⁷	1.5	0	Yes	0
12	3	33	Pr	27.3	75	1.04 × 10⁵	2 × 10⁷	7	6	No	0
13	5	33	Pr	27.3	75	7.99 × 10⁴	1.36 × 10⁷	7	6	No	0
14	5	33	Pr	27.3	75	8.53 × 10⁴	1 × 10⁷	1.5	6	No	0
From SEL Runs
1	1	125	Pr	27.3	75	1.07 × 10⁵	2 × 10⁷	7	6	Yes	396
2	1	125	Pr	0	66.43	1.14 × 10⁵	9.96 × 10⁶	7	6	Yes	5

Figure 8-1 Worst Case Overlay of V_OUT and SS SET for Run 1 at LET_EFF 75 MeV × cm² / mg and T = 125°C