Datasheet

TPS54140
www.ti.com SLVS889B –OCTOBER 2008–REVISED SEPTEMBER 2013
REVISION HISTORY
Changes from Original (October 2008) to Revision A Page
• Changed Features Item From: 300kHz to 2.5MHz Switching Frequency To: 100kHz to 2.5MHz Switching Frequency ..... 1
• Changed Description text From: "within 93% to 107% of its nominal voltage." To: "within 94% to 107% of its nominal
voltage." ................................................................................................................................................................................ 1
• Changed Enable threshold +50 mV TYP value From: ±3.8 To: –3.8 ................................................................................... 3
• Changed Enable threshold ±50 mV TYP value From: ±0.9 To: –0.98 ................................................................................. 3
• Changed Hysteresis current TYP value From: ±2.9 To: –2.9 ............................................................................................... 3
• Changed Error amplifier transconductance (g
M
) Test Condition From: ±2 μA < I
COMP
< 2 μA, V
COMP
= 1 V To: –2 μA
< I
COMP
< 2 μA, V
COMP
= 1 V ................................................................................................................................................. 3
• Changed Error amplifier transconductance (g
M
) during slow start From: ±2 μA < I
COMP
< 2 μA, V
COMP
= 1 V To: –2
μA < I
COMP
< 2 μA, V
COMP
= 1 V ............................................................................................................................................ 3
• Changed text in the Error Amplifier section From: "the gm is 25 μA/V" To: "the gm is 26 μA/V" ...................................... 14
• Changed text in the Slow Start and Tracking Pin (SS/TR) section From: "VIN UVLO is excedded, EN pin pulled
below 1.25V" To: "VIN pin is below the VIN UVLO, EN pin pulled below 1.25V" .............................................................. 16
• Changed Start Input Voltage (rising VIN) voltage From: 7.25 V To: 7.7 V ......................................................................... 29
• Changed Start Input Voltage (falling VIN) voltage From: 6.25 V To: 6.7 V ........................................................................ 29
• Changed Equation 29 ......................................................................................................................................................... 30
• Changed 7.25V to 7.7V and 6.25V to 6.7V in the Under Voltage Lock Out Set Point section. ......................................... 34
• Changed Equation 47 ......................................................................................................................................................... 35
• Changed Equation 49 ......................................................................................................................................................... 36
Changes from Revision A (August 2012) to Revision B Page
• Deleted SWIFT from the data sheet Title and Features ....................................................................................................... 1
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