Datasheet

Device
OUT
FB
GND
C
10 F
IN
m
R
1
C
10 nF
BYP
C
10 F
OUT
m
IN
EN
V
IN
V
OUT
R
2
V
OUT
V
REF
- 1 R = R
1 2
V
OUT
R + R
1 2
³ 10 Am, where
TPS7A41
SBVS183 –DECEMBER 2011 www.ti.com
THEORY OF OPERATION
GENERAL DESCRIPTION
The TPS7A4101 belongs to a new generation of linear regulators that use an innovative BiCMOS process
technology to achieve very high maximum input and output voltages.
This process not only allows the TPS7A4101 to maintain regulation during very fast high-voltage transients up to
50 V, but it also allows the TPS7A4101 to regulate from a continuous high-voltage input rail. Unlike other
regulators created using bipolar technology, the TPS7A4101 ground current is also constant over its output
current range, resulting in increased efficiency and lower power consumption.
These features, combined with a high thermal performance MSOP-8 PowerPAD package, make this device ideal
for industrial and telecom applications.
ADJUSTABLE OPERATION
The TPS7A4101 has an output voltage range of ~1.175 V to 48 V. The nominal output voltage of the device is
set by two external resistors, as shown in Figure 12.
Figure 12. Adjustable Operation for Maximum AC Performance
R
1
and R
2
can be calculated for any output voltage range using the formula shown in Equation 1. To ensure
stability under no-load conditions, this resistive network must provide a current greater than or equal to 10 μA.
(1)
If greater voltage accuracy is required, take into account the output voltage offset contributions because of the
feedback pin current and use 0.1% tolerance resistors.
ENABLE PIN OPERATION
The TPS7A4101 provides an enable pin (EN) feature that turns on the regulator when V
EN
> 1.5 V.
CAPACITOR RECOMMENDATIONS
Low equivalent series resistance (ESR) capacitors should be used for the input, output, and bypass capacitors.
Ceramic capacitors with X7R and X5R dielectrics are preferred. These dielectrics offer more stable
characteristics. Ceramic X7R capacitors offer improved over-temperature performance, while ceramic X5R
capacitors are the most cost-effective and are available in higher values.
Note that high ESR capacitors may degrade PSRR.
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