Datasheet

V =
OUT
(R R
1 2
+ )
R
2
x 0.500
TPS7A7001
www.ti.com SBVS134D –JANUARY 2012–REVISED SEPTEMBER 2013
APPLICATION INFORMATION
Table 1. Sample Resistor Values for Common
OVERVIEW
Output Voltages
The TPS7A7001 offers a high current supply with
V
OUT
R
1
R
2
very low dropout voltage. The TPS7A7001 is
1.0 V 30.1 kΩ 30.1 kΩ
designed to minimize the required component count
for a simple, small-size, and low-cost solution.
1.2 V 42.2 kΩ 30.1 kΩ
1.5 V 60.4 kΩ 30.1 kΩ
INPUT CAPACITOR (IN)
1.8 V 78.7 kΩ 30.1 kΩ
Although an input capacitor is not required for
2.5 V 121 kΩ 30.1 kΩ
stability, it is recommended to connect a 1-µF to 10-
3.0 V 150 kΩ 30.1 kΩ
µF low equivalent series resistance (ESR) capacitor
3.3 V 169 kΩ 30.1 kΩ
across IN and GND near the device.
5.0 V 274 kΩ 30.1 kΩ
OUTPUT CAPACITOR (OUT)
ENABLE (EN)
The device is designed to be stable with output
The enable pin (EN) is an active high logic input.
capacitance 4.7 µF or larger. For a good load
When it is logic low, the device turns off and its
transient response, a 10-µF or larger ceramic
consumption current is less than 1 µA. When it is
capacitor is recommended. Connect the output
logic high, the device turns on. The EN pin is required
capacitor across OUT and GND near the device.
to be connected to a logic high or logic low level.
FEEDBACK RESISTORS (FB)
When the enable function is not required, connect EN
to VIN.
The voltage on the FB pin sets the output voltage and
is determined by the values of R
1
and R
2
. The values
INTERNAL CURRENT LIMIT
of R
1
and R
2
can be calculated for any voltage using
the formula given in Equation 1:
The TPS7A7001 internal current limit helps protect
the regulator during fault conditions. During current
limit, the output sources a fixed amount of current
(1)
that is largely independent of output voltage. For
Table 1 shows the recommended resistor values for
reliable operation, the device should not be operated
the best performance of the TPS7A7001. In Table 1,
in a current limit state for extended periods of time.
E96 series resistors are used. For the actual design,
Powering on the device with the enable pin, or
pay attention to any resistor error factors.
increasing the input voltage above the minimum
operating voltage while a low-impedance short exists
on the output of the device, may result in a sequence
of high-current pulses from the input to the output of
the device. The energy consumed by the device is
minimal during these events; therefore, there is no
failure risk. Additional input capacitance helps to
mitigate the load transient requirement of the
upstream supply during these events.
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