Datasheet

TPS53313
www.ti.com SLUSAS8 –DECEMBER 2011
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, V
VIN
= 12 V, PGND = GND (Unless otherwise noted (unless otherwise noted)
PARAMETER CONDITIONS MIN TYP MAX UNIT
OVERCURRENT AND ZERO CROSSING
When I
OUT
exceeds this threshold for 4
consecutive cycles, 2.2-nF capacitor to 4.5 A
MODE/SS pin
When I
OUT
exceeds this threshold for 4
Overcurrent limit on high-side FET
I
OCPL
consecutive cycles, no capacitor to MODE/SS 6 A
(peak)
pin
When I
OUT
exceeds this threshold for 4
consecutive cycles, 10-nF capacitor to 9
MODE/SS pin
Immediately shut down when sensed current
reach this value, 2.2-nF capacitor to MODE/SS 4.5 A
pin
One time overcurrent shut-off on Immediately shut down when sensed current
I
OCPH
6 A
the low-side FET (peak) reach this value, no capacitor to MODE/SS pin
Immediately shut down when sensed current
reach this value, 10-nF capacitor to MODE/SS 9
pin
Zero crossing comparator internal
V
ZXOFF
SW – PGND, SKIP mode –3 mV
offset
POWER GOOD
V
PGDL
Power good low threshold Measured at the FB pin w/r/t VREF 80% 83% 86%
V
PGDH
Power good high threshold Measured at the FB pin w/r/t VREF 114% 117% 120%
V
PG(hys)
Power good hysteresis 2
Minimum Vin voltage for valid PG at Measured at V
IN
with 1-mA (or 2-mA) sink
V
IN(min_pg)
1 V
startup. current on PG pin at startup
V
PG(pd)
Power good pull-down voltage Pull down voltage with 4-mA sink current 0.2 0.4 V
I
PG(leak)
Power good leakage current Hi-Z leakage current, apply 3.3-V in off state 12.0 16.2 µA
OUTPUT OVERVOLTAGE AND UNDERVOLTAGE PROTECTION
T
OVPDLY
Overvoltage protection delay time Time from FB out of +17% of VREF to OVP fault 2 µs
T
UVPDLY
Undervoltage protection delay time Time from FB out of -17% of VREF to UVP fault 10 µs
THERMAL SHUTDOWN
THSD
(2)
Thermal shutdown Shut-down controller, attempt soft-stop 130 140 150 °C
THSD
HYST
(2
Thermal shutdown hysteresis Controller re-starts after temperature drops 40 °C
)
(2) Ensured by design. Not production tested.
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