LP5910_15 Datasheet, PDF (17/27 Pages) Texas Instruments – LP5910 Ultra-Low-Noise, 300-mA Linear Regulator for RF and Analog Circuits - Requires No Bypass Capacitor

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LP5910
SNVSA91B – SEPTEMBER 2015 – REVISED OCTOBER 2015
9 Power Supply Recommendations
This device is designed to operate from an input supply voltage range of 1.3 V to 3.3 V. The input supply must
be well regulated and free of spurious noise. To ensure that the LP5910 output voltage is well regulated and
dynamic performance is optimum, the input supply must be at least V_OUT + 0.5 V.
10 Layout
10.1 Layout Guidelines
The dynamic performance of the LP5910 is dependant on the layout of the PCB. PCB layout practices that are
adequate for typical LDOs may degrade the PSRR, noise, or transient performance of the LP5910.
Best performance is achieved by placing C_IN and C_OUT on the same side of the PCB as the LP5910 device, and
as close as is practical to the package. The ground connections for C_IN and C_OUT must be back to the LP5910
GND pin using as wide and as short of a copper trace as is practical.
Avoid connections using long trace lengths, narrow trace widths, and/or connections through vias. These add
parasitic inductances and resistance that results in inferior performance especially during transient conditions.
10.2 Layout Examples
IN
OUT
A1
A2
C_IN
Via
C_OUT
B1
B2
EN
GND
Figure 28. LP5910 Typical DSBGA Layout
C_OUT
OUT ¹
NC 2
NC 3
6 IN
C_IN
5 GND
4 EN
Figure 29. LP5910 Typical WSON Layout
10.3 DSBGA Mounting
The DSBGA package requires specific mounting techniques, which are detailed in TI Application Note AN-1112,
DSBGA Wafer Level Chip Scale Package (SNVA009). For best results during assembly, alignment ordinals on
the PC board may be used to facilitate placement of the DSBGA device.
10.4 DSBGA Light Sensitivity
Exposing the DSBGA device to direct light may cause incorrect operation of the device. High intensity light
sources such as halogen lamps can affect electrical performance if they are situated in close proximity to the
device. The wavelengths that have the most detrimental effect are reds and infra-reds, which means that the
fluorescent lighting used inside most buildings has little effect on performance.
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