Datasheet
TPS40400
www.ti.com
SLUS930B –APRIL 2011– REVISED OCTOBER 2011
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated, these specifications apply for –40°C ≤ T
J
≤ 125°C, V
DD
= 12 Vdc, FREQUENCY_SWITCH = 600 kHz
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
MEASUREMENT SYSTEM
t
IDLY
Read delay time
(9)
153 192 231 μs
I
RES
Current measurement resolution (LSB)
(10) (11)
122 μV
I
RNG
Current measurement range
(11) (12)
–45 110 mV
I
ACC
Gain accuracy
(13)
–3% 3%
I
OFST
Offset –3 3 mV
V
OUT(res)
VOUT measurement resolution (LSB) 15.625 mV
V
OUT(rng)
VOUT voltage measurement range 0 14 V
V
OUT(gain)
Gain accuracy
(13)(14)
–2 2 LSB
V
OUT(gain_adj)
Gain adjustment range through PMBus –10% 10%
V
OUT(ofst)
Offset
(13)(14)
–3% 3%
V
OUT(ofst_adj)
Gain adjustment range through PMBus –125 124 mV
V
IN(res)
V
IN
measurement resolution 32.5 mV
V
IN(rng)
V
IN
voltage measurement range 3.0 20 V
V
IN(gain)
Gain accuracy
(13)(14)
–2% 2%
V
IN(gain_adj)
Gain adjustment range through PMBus –10% 10%
V
IN(offst)
Offset
(13)(14)
–5.5 –2 1.4 LSB
V
IN(offst_adj)
Offset adjustment range through PMBus –2 1.968 V
THERMAL SHUTDOWN
T
JSD
Junction OT shutdown temperature
(14)
135 145 155 °C
T
JSDH
Shutdown hysteresis
(14)
25 30 35 °C
T
JWRN
Junction OT warning threshold
(14)
120 130 140 °C
T
JWRNH
Junction OT warning temperature hysteresis
(14)
15 20 25 °C
(9) All read backs are an average of 16 consecutive measurements – not a rolling average. Time is a delay between parameter updates.
(10) Constrained by the resolution of READ_IOUT command. This presents as the greater of 122 µV/ IOUT_CAL_GAIN or 62.5 mA, the
resolution of the READ_IOUT command
(11) Voltage is converted to current by dividing by IOUT_CAL_GAIN, the effective value of the resistance used to sense current in the
application. Maximum amount that can be reported via PMBus is 64A.
(12) Current reading is only supported to 0 average. Voltage transients to –45mV are taken into account when computing this average.
(13) PMBus commands provide for calibration of each device on an individual basis for improved overall system accuracy.
(14) Ensured by design. Not production tested.
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