0

10

20

30

40

50

60

70

80

90

10

100

1k

10k

100k

1M

10M

Frequency (Hz)

IOUT = 10 mA

IOUT = 50 mA

IOUT = 150 mA

C012

0.001

0.01

0.1

1

10

10

100

1k

10k

100k

1M

10M

Frequency (Hz)

VOUT = 3.3 V

VOUT = 1.0 V

C013

TLV716, TLV716P

www.ti.com

SBVS217B – JUNE 2013 – REVISED NOVEMBER 2015

8.2.2.1 Input and Output Capacitor Requirements

The TLV716 and TLV716P uses an advanced internal control loop to obtain stable operation both with or without

the use of input or output capacitors. If an output capacitor is used the device can support values as high as 100-

µF. The dynamic performance of the device is improved with the use of an output capacitor. An output

capacitance of 0.1

μF or larger generally provides good dynamic response. X5R- and X7R-type ceramic

capacitors are recommended because these capacitors have minimal variation in value and equivalent series

resistance (ESR) over temperature.

Although an input capacitor is not required for stability, good analog design practice is to connect a 0.1-µF to

1-µF capacitor from IN to GND. This capacitor counteracts input source impedance and improves supply

transient response, input ripple, and PSRR. A higher value capacitor may be necessary if large, fast, rise-time

load transients are anticipated or if the device is located several inches from the input power source.

8.2.2.2 Dropout Voltage

The TLV716 and TLV716P use a PMOS pass transistor to achieve low dropout. When (VIN – VOUT) is less than

the dropout voltage (VDO), the PMOS pass device is in the linear region of operation and the input-to-output

resistance is the RDS(ON) of the PMOS pass element. VDO scales approximately with the output current because

the PMOS device behaves like a resistor in dropout.

As with any linear regulator, PSRR and transient response are degraded as (VIN – VOUT) approaches dropout.

8.2.3 Application Curves

Figure 25. Power-Supply Rejection Ratio vs Frequency

Figure 26. Output Spectral Noise Density

(VOUT = 3.3 V)

9 Power Supply Recommendations

These devices are designed to operate from an input voltage supply range from 1.4 V to 5.5 V. The input voltage

range must provide adequate headroom for the device to have a regulated output. This input supply must be

well-regulated and stable. If the input supply is noisy, additional input capacitors with low ESR can help improve

the output noise performance.

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