TPS799-Q1 datasheet(13/25 Pages) TI1 | 200 mA, Low Quiescent Current, Ultralow Noise, High PSRR, Low Dropout, Linear Regulators

Part No.	TPS799-Q1

Description	200 mA, Low Quiescent Current, Ultralow Noise, High PSRR, Low Dropout, Linear Regulators

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Manufacturer	TI1 [Texas Instruments]

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Frequency (Hz)

IOUT = 1 mA

IOUT = 100 mA

IOUT = 250 mA

COUT = 2.2 µF

CNR = 0.01 µF

G001

TPS799-Q1

www.ti.com

SBVS097F – MARCH 2008 – REVISED JUNE 2015

Typical Application (continued)

8.2.2.5 Minimum Load

The TPS799xx-Q1 is stable and well behaved with no output load. To meet the specified accuracy, a minimum

load of 500

μA is required. Below 500 μA at junction temperatures near 125°C, the output can drift up enough to

cause the output pulldown to turn on. The output pulldown limits voltage drift to 5% typically, but ground current

could increase by approximately 50

μA. In typical applications, the junction cannot reach high temperatures at

light loads since there is no appreciable dissipated power. The specified ground current would then be valid at no

load in most applications.

8.2.3 Application Curve

Figure 14. Power-Supply Rejection Ratio vs Frequency

9 Power Supply Recommendations

These devices are designed to operate from an input voltage supply range between 2.7 V and 6.5 V. The input

voltage range provides adequate headroom in order for the device to have a regulated output. This input supply

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

improve the output noise performance.

10 Layout

10.1 Layout Guidelines

10.1.1 Board Layout Recommendations to Improve PSRR and Noise Performance

To improve AC performance such as PSRR, output noise, and transient response, TI recommends designing the

board with separate ground planes for VIN and VOUT, with each ground plane connected only at the GND pin of

the device. In addition, the ground connection for the bypass capacitor should connect directly to the GND pin of

the device.

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