TPS71750-Q1 Datasheet, PDF (11/23 Pages) Texas Instruments – Low Noise, High-Bandwidth PSRR Low-Dropout 150-mA Linear Regulator

www.ti.com
TPS71750-Q1
TPS71709-Q1
TPS71745-Q1
SLVSBM4A – SEPTEMBER 2012 – REVISED AUGUST 2013
APPLICATION INFORMATION
The TPS717xx-Q1 belongs to a family of new generation LDO regulators that use innovative circuitry to achieve
ultra-wide bandwidth and high loop gain, resulting in extremely high PSRR (up to 1 MHz) at very low headroom
(V_IN – V_OUT). Fixed voltage versions provide a noise reduction pin to bypass noise generated by the bandgap
reference and to improve PSRR while a quick-start circuit fast-charges this capacitor. These features, combined
with low noise, enable, low ground pin current, and ultra-small packaging, make this part ideal for portable
applications. This family of regulators offers sub-bandgap output voltages, current limit and thermal protection,
and is fully specified from –40°C to 125°C.
Figure 33 shows the basic circuit connections for the fixed voltage options. Figure 34 gives the connections for
the adjustable output version (TPS71701-Q1). Note that the NR pin is not available on the adjustable
version.
Optional 1-mF input
capacitor. May improve
source impedance, noise
or PSRR.
V_IN
IN
OUT
V_OUT
TPS717xx-Q1
EN GND NR
1 mF
Ceramic
V_EN
Optional 0.01-mF bypass
capacitor to reduce
output noise and
increase PSRR.
Figure 33. Typical Application Circuit
(Fixed Voltage Versions)
Optional 1-mF input
capacitor. May improve
source impedance, noise
or PSRR.
V_IN
IN
OUT
V_OUT
TPS71701-Q1
EN GND FB
R₁
1 mF
Ceramic
R₂
V_EN
Figure 34. Typical Application Circuit
(Adjustable Voltage Version)
For the adjustable version (TPS71701-Q1), the NR pin is replaced with a feedback (FB) pin. The voltage on this
pin sets the output voltage and is determined by the values of R₁ and R₂. The values of R₁ and R₂ can be
calculated for any voltage using the formula given in Equation 1:
V_OUT
=(R^{1 + R2}
R₂
)
x
0.800,
R₂
~
320kW
(1)
The value of R₂ directly impacts the stability of the device and should be chosen at approximately 160 kΩ or 320
kΩ. Sample resistor values for common output voltages are shown in Table 2.
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: TPS71750-Q1 TPS71709-Q1 TPS71745-Q1