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PDF WL2817DA Data sheet ( Hoja de datos )
| Número de pieza | WL2817DA | |
| Descripción | CMOS LDO | |
| Fabricantes | WillSEMI | |
| Logotipo |  |
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WL2817
Ultra low dropout, 500mA/1A, CMOS LDO
WL2817DA
Http://www.sh-willsemi.com
Descriptions
The WL2817 series are ultra low dropout, Low
quiescent current, high PSRR CMOS LDO.
Using CMOS construction, the quiescent current
consumed by the WL2817 is typically 160uA over the
entire input voltage range, making it attractive for
consumer, networking applications that demand high
output current. The WL2817 series are available in
wide output voltage range version from 1.0V to 3.3V.
DFN1216-8
The WL2817 series offer thermal shutdown (OTP) and
current limit functions, to assure the stability of chip
and power system at wrong condition, and it uses
trimming technique to guarantee output voltage
accuracy within ±2%.
The WL2817 series can choose the output current limit
between 1.0A or 500mA by alternating the LCON pin
between “H” or “L”.
Pin Configuration (Top View)
The WL2817 regulators are available in DFN1612-8L
packages. Standard products are Pb-free and
Halogen-free.
Features
Input voltage
: 2.5V~5.5V
Output voltage range :1.0V 1.8V 2.8V 3V 3.3V
Output current : 500mA/1A
PSRR
: 60dB(@ Vout=3V)
Dropout voltage : 70mV @ IOUT=0.5A
Output noise
: 50μVRMS
Quiescent current : 160μA Typ.
Applications
LCD TV
STB
Computer, Graphic card
Network communication equipments
Others portable electronics devices
B = Device code (3.0V)
* = Month code (N: 2015.01,
O:2015.02, and so on)
Marking
Order Information
For detail information, Please refer to page 9.
Will Semiconductor Ltd.
1 Mar. 2017 – Rev1.5
1 page  
EN logic low voltage
EN pull-down current
LCON pull-down current
EN logic high voltage
EN logic low voltage
LCON logic high
voltage
LCON logic low
voltage
Thermal shutdown
threshold
Thermal shutdown
hysteresis
VENL
Ien
ILCON
VENH
VENL
VENH
VENL
TSD
△ TSD
VIN=5.5V, IOUT=0mA
WL2817DA
0.4 V
0.2 1
uA
0.2 1
uA
1.2 V
0.4 V
1.2 V
0.4 V
165 oC
30 oC
*1: For CC (Constant Current) mode, please refer to Start-up Characteristics.
*2 *3 *4 *5: Please refer to reverse current protection mode
Start-up Characteristics
Constant slope circuit is included in the WL2817 to prevent the overshoot of the output voltage. If inrush current
increases due to the large capacitance of Cout, the operation mode will be shift from Constant Slope (CS) mode to
Constant Current (CC) mode. The CC mode maintains a constant inrush current. In the CC mode, ton varies with the size
of Cout and the load current.
Reverse Current Protection Circuit
The WL2817 include a Reverse Current Protection Circuit, which stop the reverse current from Vout pin to Vin pin or
GND pin when Vout becomes higher than Vin.
Following figure shows the load characteristics of each mode. When giving the Vout pin a constant voltage and
decreasing the Vin voltage,the Vin voltage will become lower than Vout-Vrev_det, the reverse current protection starts to
function to stop the load current. By increasing the Vin voltage higher than Vout-Vrev_rel, the protection mode will be released
to let the load current to flow. When Vin voltage is between Vout and Vrev_det, the parasitic diode between Vin pin and Vout pin
becomes forward direction. As a result, the current flows from Vout pin to Vin pin, and the maximum of the current is Irevmax.
Figure1.Detection/Release Threshold value of Reverse Current Protection
Will Semiconductor Ltd.
5 Mar. 2017 – Rev1.5
5 Page 
VIN=4V，IO=150mA
WL2817DA
3.Load Step
VIN=4V,IO=50mA-100mA
VIN=4V,IO=1mA-250mA
VIN=4V,IO=1mA-500mA
VIN=4V,IO=1mA-1A
Will Semiconductor Ltd.
11 Mar. 2017 – Rev1.5
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet WL2817DA.PDF ] | |
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