PE99155 Datasheet, PDF (5/15 Pages) Peregrine Semiconductor – Radiation Hardened UltraCMOS Monolithic Point-of-Load Synchronous Buck Regulator with Integrated Switches

PE99155
Product Specification
Typical Performance Characteristics
Figure 4. Efficiency Curves Over Output
Load Current and Temperature
100
95
90
85
80
75
70
65
60
55
50
0
PE99155 Efficiency versus Output Current
VIN=5V, VOUT=2.5V, Fsw=1MHz
Tc = ‐55°C
Tc = +25°C
Tc = +125°C
1 2 3 4 5 6 7 8 9 10
Output Current (A)
Figure 5. Efficiency Curves Over Typical
Output Voltages
100
95
90
85
80
75
70
65
60
55
50
0
PE99155 Efficiency versus Output Current
Vin=5V, Fsw=1MHz, T=+25°C
Vout=3.3V
Vout=2.5V
Vout=1.5V
Vout=1.0V
1 2 3 4 5 6 7 8 9 10
Output Current (A)
Thermal Derating Curve
The thermal derating curve plots the case temper-
ature against the maximum current allowed while
maintaining safe electrical operation below the
maximum junction temperature. Reliability guide-
lines require the continuous or average output
current to remain below 10A at 125°C junction
temperature. At full load and 125°C case temper-
ature, the die temperature will approach 145°C.
The output current should be derated starting at
105°C case based on the specific application’s
worst-case time averaged current analysis using
Figure 6.
Figure 6. Thermal Derating Curve
ILOAD (max continuous / average) derating for Tcase
12
11
10
9
8
7
6
5
4
3
2
1
0
-50
-25
0
25
50
75
Case Temperature (^oC)
100
125
The PE99155 meets the maximum allowable re-
quirement of MIL-PRF-38535 (<2 x 10⁵ A / cm²) by
achieving a current density of <1.5 x 10⁵ A / cm².
Document No. 70-0307-07 │ www.psemi.com
©2011-2012 Peregrine Semiconductor Corp. All rights reserved.
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