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PDF LR9500 Data sheet ( Hoja de datos )
| Número de pieza | LR9500 | |
| Descripción | 150mA LINEAR REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LR9500 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
LR9500
Preliminary
CMOS IC
ULTRA LOW NOISE, 150mA
LINEAR REGULATOR FOR
RF/ANALOG CIRCUITS
REQUIRES NO BYPASS
CAPACITOR
DESCRIPTION
The LR9500 is a linear regulator capable of supplying 150 mA
output current. Designed to meet the requirements of RF/Analog
circuits, the LR9500 device provides low noise, high PSRR, low
quiescent current, and low line transient response figures. Using
new innovative design techniques the LR9500 offers class-leading
device noise performance without a noise bypass capacitor.
The device is designed to work with 0.47 μF input and output
ceramic capacitors. (No Bypass Capacitor is required)
This device is available with 1.5V, 1.8V, 2.0V, 2.5V, 2.7V, 2.8V,
3.0V, 3.3V, 4.0V and 4.5V outputs. Please contact your local sales
office for any other voltage options.
4
5
3
12
SOT-25
FEATURES
* Stable with 0.47 μF Ceramic Input and Output Capacitors
* No Noise Bypass Capacitor Required
* Logic Controlled Enable
* Thermal-Overload and Short-Circuit Protection
* −40°C to +125°C Junction Temperature Range for Operation
*Input Voltage Range, 2.5V to 5.5V
*Output Voltage Range, 1.5V to 4.5V
*Output Current, 150 mA
*Low Output Voltage Noise, 6.5 μVRMS
*PSRR, 75 dB at 1 kHz
*Output Voltage Tolerance, ± 2%
*Virturally Zero IQ (Disabled), <1 µA
*Very Low IQ (Enabled), 25 μA
*Startup Time, 150 μs
*Low Dropout, 80 mV (Typ.)
ORDERING INFORMATION
Ordering Number
LR9500G-xx-AF5-R
Note: xx: Output Voltage, refer to Marking Information.
Package
SOT-25
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2016 Unisonic Technologies Co., Ltd
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QW-R102-083.a
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LR9500
Preliminary
TYPICAL APPLICATION CIRCUIT
CMOS IC
EXTERNAL CAPACITORS
Like any low-dropout regulator, the LR9500 requires external capacitors for regulator stability. The LR9500 is
specifically designed for portable applications requiring minimum board space and smallest components. These
capacitors must be correctly selected for good performance.
INPUT CAPACITOR
An input capacitor is required for stability. The input capacitor should be at least equal to or greater than the
output capacitor. It is recommended that a 0.47 µF capacitor be connected between the LR9500 input pin and
ground. This capacitor must be located a distance of not more than 1 cm from the input pin and returned to a clean
analogue ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input.
Important
To ensure stable operation it is essential that good PCB practices are employed to minimize ground impedance
and keep input inductance low. If these conditions cannot be met, or if long leads are to be used to connect the
battery or other power source to the LR9500, then it is recommended to increase the input capacitor to at least 2.2
µF. Also, tantalum capacitors can suffer catastrophic failures due to surge current when connected to a
low-impedance source of power (like a battery or a very large capacitor). If a tantalum capacitor is used at the input,
it must be ensured by the manufacturer to have a surge current rating sufficient for the application.
There are no requirements for the ESR (Equivalent Series Resistance) on the input capacitor, but tolerance and
temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will remain 0.47
μF ±30% over the entire operating temperature range.
OUTPUT CAPACITOR
The LR9500 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor
(dielectric types X5R or X7R) in the 0.47 μF to 10 μF range, and with ESR between 5 mΩ to 500 mΩ, is suitable in
the LR9500 application circuit. For this device the output capacitor should be connected between the VOUT pin and a
good ground connection and should be mounted within 1 cm of the device.
It may also be possible to use tantalum or film capacitors at the device output, VOUT, but these are not as
attractive for reasons of size and cost (see the CAPACITOR CHARACTERISTICS section below).
The output capacitor must meet the requirement for the minimum value of capacitance and have an ESR value
that is within the range 5 mΩ to 500 mΩ for stability.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LR9500.PDF ] | |
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