Datasheet

V = 0.9 V
OUT
= 0.5 V + 400 mV
0.5 V is V
ref
V = 0.5 V (1 + 3.2R/4R)´
OUT
3.2R
32R 16R 8R 4R 2R 1R
V
IN
OUT
SNS
FB
FB
0.5 V
50mV
100mV 200mV 400mV 800mV 1.6V
OUT
SNS
FB
PG
50mV
IN
Thermal Pad
EN
SS
NC
1.6V
100mV 200mV GND 400mV 800mV
OUT OUT
GND
IN IN
Optional
C
FF
C
FF
V = 1.2 V
OUT
= 0.5 V + 100 mV + 200 mV + 400 mV
0.5 V is V
ref
V = 0.5 V (1 + 3.2R/2.29R) 2.29R is parallel resistance of 16R, 8R, and 4R.´
OUT
3.2R
32R 16R 8R 4R 2R 1R
V
IN
OUT
SNS
FB
0.5 V
50mV 100mV 200mV 400mV 800mV 1.6V
OUT
SNS
FB
PG
50mV
IN
Thermal Pad
EN
SS
NC
1.6V
100mV 200mV GND 400mV 800mV
OUT OUT
GND
IN IN
Optional
C
FF
FB
C
FF
TPS7A7100
www.ti.com SBVS189E –MARCH 2012–REVISED SEPTEMBER 2013
APPLICATION INFORMATION
OVERVIEW
The TPS7A7100 belongs to a family of new-generation LDO regulators that uses innovative circuitry to offer
very-low dropout voltage along with the flexibility of a programmable output voltage.
The dropout voltage for this LDO regulator family is 0.14 V at 1 A. This voltage is ideal for making the
TPS7A7100 into a point-of-load (POL) regulator because 0.14 V at 1 A is lower than any voltage gap among the
most common voltage rails: 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, and 3.3 V. This device offers a fully user-
configurable output voltage setting method. The TPS7A7100 output voltage can be programmed to any target
value from 0.9 V to 3.5 V in 50-mV steps.
Another big advantage of using the TPS7A7100 is the wide range of available operating input voltages: from 1.5
V to 6.5 V. The TPS7A7100 also has very good line and load transient response. All these features allow the
TPS7A7100 to meet most voltage-regulator needs for under-6-V applications, using only one device so that less
time is spent on inventory control.
Texas Instruments also offers different output current ratings with other family devices: the TPS7A7200 (2 A) and
TPS7A7300 (3 A).
USER-CONFIGURABLE OUTPUT VOLTAGE
Unlike traditional LDO devices, the TPS7A7100 comes with only one orderable part number; there is no
adjustable or fixed output voltage option. The output voltage of the TPS7A7100 is selectable in accordance with
the names given to the output voltage setting pins: 50mV, 100mV, 200mV, 400mV, 800mV, and 1.6V. For each
pin connected to the ground, the output voltage setting increases by the value associated with that pin name,
starting from the value of the reference voltage of 0.5 V; floating the pin(s) has no effect on the output voltage.
through show examples of how to program the output voltages.
Figure 34. 0.9-V Configuration Figure 35. 1.2-V Configuration
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