Datasheet
1
2
3
4
5
6
7
8 9 10 11 12 13
15
14
21
20
19
18
17
16
22
PTH08T255W
Texas
Instruments
PTH08T255W
www.ti.com
........................................................................................................................................................................................... SLTS290 – NOVEMBER 2008
ELECTRICAL CHARACTERISTICS
PTH08T255W
(continued)
T
A
= 25 ° C, V
I
= 12 V, V
O
= 3.3 V, C
I
= 1000 µ F, C
O
= 1000 µ F, and I
O
= I
O
max (unless otherwise stated)
PARAMETER TEST CONDITIONS PTH08T255W UNIT
MIN TYP MAX
Capacitance Value Nonceramic 1000
(6)
8000
(7)
µ F
w/o TurboTrans Ceramic 1000
Equivalent series resistance (non-ceramic) 3 m Ω
C
O
External output capacitance
see table
Capacitance Value µ F
(6) (8)
w/ TurboTrans
Capacitance × ESR product (C
O
× ESR) 1000 10000
(8)
µ F × m Ω
Per Telcordia SR-332, 50% stress,
MTBF Reliability 2.56
10
6
Hr
T
A
= 40 ° C, ground benign
(6) 1000 µ F of external non-ceramic output capacitance is required for basic operation. Adding additional capacitance at the load further
improves transient response. Up to 1000 µ F of ceramic capacitance may be added in addition to the required non-ceramic capacitance.
See the Capacitor Application Information section and the TuboTrans Technology section for more guidance.
(7) This is the calculated maximum when not using TurboTrans™ technology. This value includes both ceramic and non-ceramic
capacitors. The minimum ESR requirement often results in a lower value of output capacitance. See the Capacitor Application
Information section for further guidance.
(8) When using TurboTrans™ technology, a minimum value of output capacitance is required for proper operation. Additionally, low ESR
capacitors are required for proper operation. See the TurboTrans Technology section for further guidance.
Copyright © 2008, Texas Instruments Incorporated 5
Product Folder Link(s): PTH08T255W