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PDF LR8802 Data sheet ( Hoja de datos )
| Número de pieza | LR8802 | |
| Descripción | Low Dropout 250mA Linear Regulator | |
| Fabricantes | LRC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LR8802 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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LESHAN RADIO COMPANY, LTD.
Low Dropout
LR8802
250mA Linear Regulator
DESCRIPTION
The LR8802 is a low-noise, low-dropout linear
regulator. It operates from 2.7V to 6.5V input
voltage, and regulates the output voltage with
2% accuracy at 2.5V, 2.85V, 3.3V, or from
1.25V to 5V.
The LR8802 can supply up to 250mA of load
current. The LR8802 features thermal overload
protection. It is available in a 5-pin TSOT23-5
package.
FIXED VOLTAGE PART NUMBERS
Part Number
Output Voltage
LR8802DJ –2.5
LR8802DJ –2.85
LR8802DJ –3.3
2.5V
2.85V
3.3V
FEATURES
• Low 250mV Dropout at 250mA Output
• 2% Accurate Output Voltage
• Fixed Output Voltage Options of 2.5V,
2.85V or 3.3V
• Adjustable Output Voltage Option from
1.25V to 5V using an External Resistor
Divider
• Up to 6.5V Input Voltage
• High PSRR
o 70dB at 1KHz
o 30dB at 1MHz
• Better Than 0.001%/mA Load Regulation
• Stable With Low-ESR Output Capacitor
• Low 125µA Ground Current
• Internal Thermal Protection
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number Output*
Dimensions
LR8802DJ-00A 2.85V 2.0”X x 2.0”Y x 0.4”Z
• 802.11 PC Cards
• Mobile Handset PLL Power
• Audio Codec Power
*
Default output voltage adjustable from 1.25V to 5.0V using an
external resistor divider.
TYPICAL APPLICATION
VIN
2.7V to 6.5V
1
IN
5
OUT
LR8802DJ-X.X
VIN
3
EN
GND
FB 4
EN (Pin3)
2
may be connected
to IN (Pin 1) directly
OUTPUT
1.25V to 5V
R1
The sum of
R2
R1 and R2
should not
exceed 100k
LR8802_TAC_S01
VDROPOUT vs ILOAD
300
250
200
150
100
50
0
0 50 100 150 200 250 300
I (mA)
1/7
1 page  
APPLICATION INFORMATION
SETTING THE OUTPUT VOLTAGE
The fixed output voltage of the LR8802DJ is set
to 2.5V, 2.85V or 3.3V, depending on the
internal resistor divider (Figure 1). You can also
adjust the output voltage by using an external
resistor divider (R1 and R2 in Figure 2).
However, the sum of R1 and R2 should not
exceed 100kΩ to minimize the impact of the
internal resistor divider. For accurate output-
voltage setting, it is suggested to use 10kΩ
(±1%) for the low-side resistor R2 of the voltage
divider, the high side resistor R1 can be
determined by the equation:
R1
=
R2
×
⎜⎜⎝⎛
VOUT −
VFB
VFB
⎟⎟⎠⎞
Where VFB is the OUT feedback threshold
voltage equal to 1.222V.
Example: For 2.5V Output
R1 =
2.5V − 1.222V
⎜⎛
⎝
1.222V
10kΩ
⎟⎞
⎠
= 10.41kΩ
LESHAN RADIO COMPANY, LTD.
You can select a standard 10.5k (±1%)
resistor for R1.
The following table lists the selected R1 values
for some typical output voltages:
Table 1—Adjustable Output Voltage R1 Values
VOUT (V)
1.25
1.5
1.8
2
2.5
2.8
3
3.3
4
5
R1 (Ω)
232
2.26k
4.75k
6.34k
10.5k
13k
14.7k
16.9k
22.6k
30.9k
In Figures 3 and 4, C2 is added for an improved
transient response.
5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LR8802.PDF ] | |
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