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PDF LD3870 Data sheet ( Hoja de datos )
| Número de pieza | LD3870 | |
| Descripción | LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
LD3870
LINEAR INTEGRATED CIRCUIT
LOW DROPOUT VOLTAGE
REGULATOR
DESCRIPTION
The UTC LD3870 is low dropout voltage regulator designed
for cellular phone application.
FEATURES
* High Ripple Rejection: 56dB≤RR(DC<f<60kHz)
66dB typ. (f=100Hz)
60dB typ. (f=1kHz)
* Output Noise Voltage: eN=30ΜV , Cp=0.01μF
* Output Current: IO(MAX)=150mA
* High Precision Output: VO±2%
* Low Dropout Voltage: VD=0.12V typ.
(IO=60mA,Vo≥1.8V)
* Input Voltage range: +2~+14V(VO =1.5V Version)
* ON/OFF Control: Active High
* Output capacitor with 4.7uF ceramic capacitor
* Internal Short Circuit Current Limit
* Internal Thermal Overload Protection
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LD3870L-xx-AF5-R
LD3870G-xx-AF5-R
Package
SOT-25
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., LTD
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QW-R105-028,E
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LD3870
TYPICAL APPLICATON
For ON/OFF Control is not required:
0.1 μF
R
(0~300kΩ)
LINEAR INTEGRATED CIRCUIT
VIN VOUT
UTC LD3870
CONTROL
NOISE
BYPASS
GND
VOUT
4.7 μF
(ceramic or tantalum)
Cp=0.01 μF
Connect control terminal to VIN terminal
The quiescent current can be reduced by using a resistance “R”. Instead, it increases the minimum operating
voltage. For further information, please refer to Figure ”Output Voltage vs. Control Voltage”.
For In use of ON/OFF CONTROL:
VIN
VIN VOUT
VOUT
0.1 μF
UTC LD3870
R
CONTROL
NOISE
BYPASS
GND
4.7 μF
(ceramic or tantalum)
Cp=0.01 μF
State of control terminal:
* ”H” Æ Output is enables.
* ”L”or “open” Æ Output is disabled.
* Noise bypass Capacitance Cp
- Noise bypass capacitance Cp reduces noise generated by hand-gap reference circuit.
- Noise level and ripple rejection will be improved when larger Cp is used.
- Use of smaller Cp value may cause oscillation.
- Use the Cp value of 0.01uF greater to avoid the problem.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet LD3870.PDF ] | |
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