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PDF L11815A Data sheet ( Hoja de datos )
| Número de pieza | L11815A | |
| Descripción | 1.5A CMOS LDO | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
L11815A
Preliminary
1.5A CMOS LDO
CMOS IC
DESCRIPTION
The UTC L11815A is a COMS linear regulator. One of it’s
feature is very low quiescent current typical as low as 45μA
and its dropout voltage is extremely low with 1.5A output
current.
The internal circuit includes thermal shutdown and current
fold-back mechanism to prevent device failure when the circuit
is operated in the bad conditions.
In application, the UTC L11815A needs a low noise,
regulated supply. For stable operation, the output capacitance
value should be 4.7μF or more.
The UTC L11815A is an ideal for battery applications,
such as instrumentations, portable electronics, wireless
devices, PC peripherals, and battery powered widgets. The
output voltage values are set during manufacturing and the
accuracy is tighten 1.5%.
FEATURES
* Quiescent Current (45μA typ.)
* Very Low Dropout Voltage
* Guaranteed 1.5A output
* Accuracy : ±1.5%
* Over-Temperature ShutDown
* With Current Limiting
* Short Circuit Current Fold-Back
* Low Temperature Coefficient
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
Package
L11815AL-xx-AA3-x-R L11815AG-xx-AA3-x-R SOT-223
L11815AL-xx-TN3-x-R L11815AG-xx-TN3-x-R
TO-252
L11815AL-xx-TQ2-x-R L11815AG-xx-TQ2-x-R
TO-263
Note: Pin Assignment: G:GND O:VOUT I:VIN
xx: Output Voltage, refer to Marking Information.
Pin Assignment
A: GOI
D: IGO
Packing
Tape Reel
www.DataSheet4U.com
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
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L11815A
Preliminary
CMOS IC
DETAILED DESCRIPATION
The UTC L11815A of CMOS regulators insist of a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
The error amplifier, over-current shutdown, and thermal protection circuits provides data for P-channel pass
transistor. The error amplifier takes output voltage for a precision reference in the normal operation and the normal
operation is restored when the junction temperature drops below 120°C.Over-current and Thermal shutdown circuits
start to work when the junction temperature is higher than 150 °C, or the current exceeds 2.2A. The output voltage
stays low when the thermal shutdown is in active.
The UTC L11815A behaves like a current source when the load reaches 2.2A. But the current would fall back to
600mA to prevent excessive power loss when the load impedance value is below 0.3Ω.Normal operation is restored
when the load resistance value is higher than 0.75 Ω.
EXTERNAL CAPACITORS
The UTC L11815A has an output capacitor to ground of 4.7μF or more in the stable operation. Ceramic
capacitors can provide the lowest ESR with the best AC performance. Aluminum Electrolytic capacitors, in contrast,
have the highest ESR with poorest AC response. Unfortunately, large value ceramic capacitors are comparatively
expensive. So we can parallel a 0.1μF ceramic capacitor with a 10μF Aluminum Electrolytic. The result is low ESR,
high capacitance, and low overall cost.
A second capacitor is recommended between the input and ground to stabilize input voltage. To get an ideal
effect the value of the input capacitor should be at least 0.1μF.
All capacitors should be placed in close proximity to the pins. This can be achieved with a star connection.
www.DataSheet4U.com
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 6 Páginas | |
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