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PDF RT9177-25CB Data sheet ( Hoja de datos )
| Número de pieza | RT9177-25CB | |
| Descripción | Ultra-Low-Noise 200mA LDO Regulator | |
| Fabricantes | ETC | |
| Logotipo |  |
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Preliminary
RT9177
Ultra-Low-Noise 200mA LDO Regulator
General Description
The RT9177 is a 200mA low dropout and low noise
micro-power regulator suitable for portable RF
applications. The output voltage accuracy within
±2% and range from 2.4V to 3.2V in 100mV
increments could be selected. It is designed for
using very low ESR output capacitor. Its output
remains stable even in using 1µF ceramic as its
output capacitor.
Using an internal PMOS as the pass device cause
that don’t need extra GND current in heavy load and
dropout conditions. In shutdown mode, nearly zero
operation current cause the IC is suitable for
battery-power devices. Other features including
current limiting, over temperature protection and
adding a capacitor in bypass pin to improve its noise
performance are functional.
Ordering Information
RT9177-
Package type
B : SOT-25 Type I
BR : SOT-25 Type II
Operating temperature range
C: Commercial standard
Output voltage
24 : 2.4V
25 : 2.5V
:
:
31 : 3.1V
32 : 3.2V
Features
z Ultra-Low-Noise(150nV/ Hz ) for RF Application
z 1µF Ceramic COUT Stable
z Low Dropout Voltage(220mV @ 200mA)
z Low Operation Current - 80µA Typical
z Shutdown Function
z Low Temperature Coefficient
z Current and Thermal Limiting
z Custom Voltage Available
z SOT-25 Package
Applications
z Cellular Telephones
z Laptop, Notebook, and Palmtop Computers
z Battery-powered Equipment
z Hand-held Equipment
Pin Configurations
Part Number
Pin Configurations
RT9177-
CB
(Plastic SOT-25)
54
TOP VIEW
1 23
1. IN
2. GND
3. SHDN
4. BP
5. OUT
RT9177-
CBR
(Plastic SOT-25)
54
TOP VIEW
1 23
1. OUT
2. GND
3. IN
4. SHDN
5. BP
Typical Application Circuit
VIN
CIN
1µF
ON
OFF
RT9177
IN OUT
GND
SHDN
COUT
1µF
VOU T
CBP
10nF
DS9177-00 Feb. 2001
www.richtek-ic.com.tw
1
1 page  
Preliminary
RT9177
PSRR
-20
-30
-40
-50 10mA
-60
-70
100mA
-80
VOUT = 3V
-90 TA = 25°C
-100 10
100
CBP = 470pF
1K
10K 100K
1M
Frequency (Hz)
Noise Signal & Spectrum Distribution
Time (mS)
0 2 4 6 8 10
150 1
540 5
-5300
≈
20
10
0
0
CIN = 1uF TAN
COUT = 4.7uF TAN
CBP = 10nF
Load = 10mA
Sampling Rate = 250KHz
-
-
-
25 50 75 100
Frequency (KHz)
-
125
Noise Signal & Spectrum Distribution
Time (mS)
0 2 4 6 8 10
21500 250
800
-25600
≈
40
20
0
CIN = 1uF TAN
COUT = 4.7uF TAN
CBP = 470nF
Load = 10mA
Sampling Rate = 250KHz
-250
-500
-750
0 -100
0 25 50 75 100 125
Frequency (KHz)
DS9177-00 Feb. 2001
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
100
PSRR
10mA
100mA
VOUT = 3V
TA = 25°C
CBP = 10nF
1K 10K 100K
Frequency (Hz)
1M
Noise Signal & Spectrum Distribution
Time (mS)
0 2 4 6 8 10
15500 150
4500
-3500
≈
20
10
0
0
50
CIN = 1uF TAN
COUT = 4.7uF TAN
CBP = 10nF
Load = 100mA
Sampling Rate = 250KHz
-50
-15
-25
25 50 75 100
Frequency (KHz)
-35
125
Noise Signal & Spectrum Distribution
Time (mS)
0 2 4 6 8 10
120500 25
80
-26500
≈
40
20
0
CIN = 1uF TAN
COUT = 4.7uF TAN
CBP = 470nF
Load = 100mA
Sampling Rate = 250KHz
-25
-50
-75
0 -10
0 25 50 75 100 125
Frequency (KHz)
www.richtek-ic.com.tw
5
5 Page 
Preliminary
RT9177
DS9177-00 Feb. 2001
www.richtek-ic.com.tw
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT9177-25CB.PDF ] | |
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