TPS75733KTTTG3 Datasheet, PDF (4/28 Pages) Texas Instruments – TPS75701 FAST-TRANSIENT REONSE 3-A LOW-DROPOUR

TPS75715, TPS75718, TPS75725, TPS75733 WITH POWER GOOD AND
TPS75701 FASTĆTRANSIENT RESPONSE 3ĆA LOWĆDROPOUT
VOLTAGE REGULATORS
SLVS306E − NOVEMBER 2000 − REVISED FEBRUARY 2009
TPS757xx PG timing diagram
VIN1
VUVLO
VOUT
Threshold
Voltage
VIT _+(see Note A)
VIT _−
(see Note A)
PG
Output
VUVLO
t
t
t
NOTE: VIT −Trip voltage is typically 9% lower than the output voltage (91%VO). VIT− to VIT+ is the hysteresis voltage.
detailed description
The TPS757xx family includes four fixed-output voltage regulators (1.5 V, 1.8 V, 2.5 V, and 3.3 V), and an
adjustable regulator, the TPS75701 (adjustable from 1.22 V to 5 V). The bandgap voltage is typically 1.22 V.
pin functions
enable (EN)
The EN terminal is an input which enables or shuts down the device. If EN is a logic high, the device will be in
shutdown mode. When EN goes to logic low, the device will be enabled.
power-good (PG)
The PG terminal for the fixed voltage option devices is an open drain, active low output that indicates the status
of V_O (output of the LDO). When V_O reaches approximately 91% of the regulated voltage, PG will go to a low
impedance state. It will go to a high-impedance state when V_O falls below approximately 89% (i.e. over load
condition) of the regulated voltage. The open drain output of the PG terminal requires a pullup resistor.
feedback (FB)
FB is an input terminal used for the adjustable-output option and must be connected to the output terminal either
directly, in order to generate the minimum output voltage of 1.22 V, or through an external feedback resistor
divider for other output voltages. The FB connection should be as short as possible. It is essential to route it in
such a way to minimize/avoid noise pickup. Adding RC networks between FB terminal and V_O to filter noise is
not recommended because it may cause the regulator to oscillate.
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