LP38853_15 Datasheet, PDF (11/28 Pages) Texas Instruments – LP38853 3A Fast-Response High-Accuracy Adjustable LDO Linear Regulator with Enable and Soft-Start

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Block Diagram
LP38853
SNVS335D – DECEMBER 2006 – REVISED APRIL 2013
IN
BIAS
LP38853-ADJ
Under-Voltage
Lock-Out
Thermal
r_EN
Shut Down
EN
Enable
1.2V
r_SS
SS
V_REF
OUT
ADJ
I_LIMIT
0.5V
GND
APPLICATION INFORMATION
EXTERNAL CAPACITORS
To assure regulator stability, input and output capacitors are required as shown in the Typical Application Circuit.
Output Capacitor
A minimum output capacitance of 10 µF, ceramic, is required for stability. The amount of output capacitance can
be increased without limit. The output capacitor must be located less than 1 cm from the output pin of the IC and
returned to the device ground pin with a clean analog ground.
Only high quality ceramic types such as X5R or X7R should be used, as the Z5U and Y5F types do not provide
sufficient capacitance over temperature.
Tantalum capacitors will also provide stable operation across the entire operating temperature range. However,
the effects of ESR may provide variations in the output voltage during fast load transients. Using the minimum
recommended 10 µF ceramic capacitor at the output will allow unlimited capacitance, Tantalum and/or
Aluminum, to be added in parallel.
Input Capacitor
The input capacitor must be at least 10 µF, but can be increased without limit. It's purpose is to provide a low
source impedance for the regulator input. A ceramic capacitor, X5R or X7R, is recommended.
Tantalum capacitors may also be used at the input pin. There is no specific ESR limitation on the input capacitor
(the lower, the better).
Aluminum electrolytic capacitors can be used, but are not recommended as their ESR increases very quickly at
cold temperatures. They are not recommended for any application where the ambient temperature falls below
0°C.
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