Datasheet

V
IN
V
OUT
t-Time-5ms/div
ENA
V
OUT
t-Time-5ms/div
TPS54331
www.ti.com SLVS839D –JULY 2008– REVISED JANUARY 2012
Figure 25. TPS54331 Start Up Figure 26. TPS54331 Start-up Relative to Enable
SPACER
REVISION HISTORY
Changes from Original (July 2008) to Revision A Page
• Changed the Elect Char - Shutdown supply current test condition From: -40°C to 25°C To: From: -40°C to 85°C and
the MAX value from 10µA to 4µA ......................................................................................................................................... 3
Changes from Revision A (August 2008) to Revision B Page
• Added 25°C to the Switching frequency test condition in the Elect Char table. ................................................................... 3
• Changed the Switching frequency Max value From: 740kHz To: 684kHz, and the Min value From: 400kHz To:
456kHz .................................................................................................................................................................................. 3
• Added 25°C to the Minimum controllable on time test condition in the Elec Char table. ..................................................... 3
• Changed the Minimum controllable on time TYP value From: 110ns To: 105ns, and the Max value From: 160ns to
130ns .................................................................................................................................................................................... 3
• Changed Rsense = 1Ω/11 To: 1Ω/12 in Equation 18 legend ............................................................................................. 15
• Changed equation From: (V
INmax
- I
Omin
x Rin) To: (V
INmax
- I
Omin
x R
DS(on) min
) .................................................................... 17
Changes from Revision B (October 2008) to Revision C Page
• Added a new table to the Description - For additional design needs ................................................................................... 2
• Changed the ABSOLUTE MAXIMUM RATINGS table, Input Voltage - EN pin max value From: 5V to 6V ........................ 2
Changes from Revision C (March 2010) to Revision D Page
• Added TPS54331DDA option to the Ordering Information table .......................................................................................... 2
• Added the DDA Package to the Pin Assignments ................................................................................................................ 4
• Changed Figure 10 ............................................................................................................................................................... 7
• Added Figure 13 ................................................................................................................................................................... 7
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