TPS544B20 Datasheet, PDF (40/75 Pages) Texas Instruments – 4.5-V to 18-V, 20-A, and 30-A SWIFT Synchronous Buck Converters with PMBus

TPS544B20, TPS544C20
SLUSB69B – MAY 2014 – REVISED JULY 2016
www.ti.com
The supported TON_RISE times over PMBus are shown in Table 8:
Table 8. Supported TON_RISE Values
TON_RISE VALUES (ms)
0.6
0.9
1.2
1.7
2.7 (default)
4.2
6.0
9.0
A value of 0 ms instructs the unit to bring its output voltage to the programmed regulation value as quickly as
possible. The contents of this register can be stored to non-volatile memory using the STORE_USER_ALL
command.
The TON_RISE command is formatted as a linear mode two’s complement binary integer.
COMMAND
TON_RISE
Format
Linear, two's complement binary
Bit Position
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Access
r
r
r
r
r
r
r
r
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
Exponent
Mantissa
Default Value
1
1
1
0
0
0
0
0
0
0
1
0
1
0
1
1
8.6.17.1 Exponent
–4 (dec), fixed.
8.6.17.2 Mantissa
The upper two bits are fixed at 0.
The lower eight bits are programmable with a default value of 43 (dec).
8.6.18 STATUS_BYTE (78h)
The STATUS_BYTE command returns one byte of information with a summary of the most critical device faults.
COMMAND
Format
Bit Position
Access
Function
Default Value
7
6
5
4
r
r
r
r
X OFF VOUT_OV IOUT_OC
0
0
0
0
A "1" in any of these bit positions indicates that:
STATUS_BYTE
Unsigned binary
3
2
r
r
VIN_UV TEMPERATURE
0
0
1
r
CML
0
0
r
NONE OF THE ABOVE
0
OFF:
The device is not providing power to the output, regardless of the reason. In this family of devices,
this flag means that the converter is not enabled.
VOUT_OV:
An output overvoltage fault has occurred.
IOUT_OC:
An output over current fault has occurred.
VIN_UV:
An input undervoltage fault has occurred.
TEMPERATURE:
A temperature fault or warning has occurred. Check STATUS_TEMPERATURE.
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