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PDF Si91841DT-26-T1 Data sheet ( Hoja de datos )
| Número de pieza | Si91841DT-26-T1 | |
| Descripción | 150-mA Ultra Low-Noise LDO Regulator With Discharge Option | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de Si91841DT-26-T1 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Si91841/3
Vishay Siliconix
150-mA Ultra Low-Noise LDO Regulator
With Discharge Option
FEATURES
D Ultra Low Dropout—130 mV at 150-mA Load
D Ultra Low Noise—30 mV(rms) (10-Hz to 100-kHz
Bandwidth)
D Shutdown Control
D 110-mA Ground Current at 150-mA Load
D 1.5% Guaranteed Output Voltage Accuracy
D 300-mA Peak Output Current Capability
D Uses Low ESR Ceramic Capacitors
D Fast Start-Up (50 ms)
D Fast Line and Load Transient Response (v 30 ms)
D 1-mA Maximum Shutdown Current
D Output Current Limit
D Reverse Battery Protection
D Built-in Short Circuit and Thermal Protection
D Si91841: Output, Auto-Discharge In Shutdown Mode
D Si91843: Output, No-Discharge In Shutdown Mode
D Fixed 1.8, 2.0, 2.2, 2.5, 2.6, 2.7, 2.8, 2.85, 2.9, 3.0, 3.3,
3.5, 3.6, 5.0-V Output Voltage Options
D Thin SOT23-5 Package
APPLICATIONS
D Cellular Phones, Wireless Handsets
D Noise-Sensitive Electronic Systems, Laptop and
Palmtop Computers
D PDAs
D Pagers
D Digital Cameras
D MP3 Player
D Wireless Modem
DESCRIPTION
The Si91841/3 is a 150-mA CMOS LDO (low dropout) voltage
regulator. It is the perfect choice for low voltage, low power
applications. An ultra low ground current makes this part
attractive for battery operated power systems. The Si91841/3
also offers ultra low dropout voltage to prolong battery life in
portable electronics. Systems requiring a quiet voltage
source, such as RF applications, will benefit from the
Si91841/3’s ultra low output noise. An external noise bypass
capacitor connected to the device’s BP pin can further reduce
the noise level. The Si91841/3 is designed to maintain
regulation while delivering 300-mA peak current, making it
ideal for systems that have a high surge current upon turn-on.
For better transient response and regulation, an active
pull-down circuit is built into the Si91841/3 to clamp the output
voltage when it rises beyond normal regulation. The Si91841
automatically discharges the output voltage by connecting the
output to ground through a 100-W n-channel MOSFET when
the device is put in shutdown mode.
The Si91841/3 features reverse battery protection to limit
reverse current flow to approximately 1-mA in the event
reversed battery is applied at the input, thus preventing
damage to the IC.
The Si91841/3 is available in both standard and lead (Pb)-free
packages.
TYPICAL APPLICATION CIRCUIT
Si91841/3
VIN
1 VIN
VOUT 5
1 mF
2 GND
VOUT
1 mF
SD
3 SD
BP 4
Thin SOT-23, 5-Lead
10 nF
Document Number: 71447
S-40592—Rev. C, 29-Mar-04
www.vishay.com
1
1 page  
Si91841/3
Vishay Siliconix
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Normalized Output Voltage vs. Load Current
0.30
0.15
VIN = VOUT(nom) + 1 V
0.00
−0.15
−0.30
0.4
0.2
−0.0
−0.2
−0.4
Normalized VOUT vs. Temperature
VIN = VOUT(nom) + 1 V
IOUT = 0 mA
IOUT = 75 mA
IOUT = 150 mA
−0.45
−0.6
−0.60
−0.8
−0.75
0
25 50 75 100 125 150
Load Current (mA)
−1.0
−40
−15 10 35 60
Ambient Temperature (_C)
85
GND Current vs. Load Current
150
VVOINU=T
= 3.0
4.0 V
V
85_C
125
25_C
100
−40_C
75
50
0
25 50 75 100 125 150
Load Current (mA)
No Load GND Pin Current vs. Input Voltage
300
250
200
150
85_C
100
25_C
−40_C
50
0
234567
Input Voltage (V)
Power Supply Rejection
0
CIN = 1 mF
COUT = 1 mF
ILOAD = 150 mA
−20 VOUT = 3.0 V
−40
−60
−80
10
100
1000
10000 100000 1000000
Frequency (Hz)
Document Number: 71447
S-40592—Rev. C, 29-Mar-04
Output Short Circuit Current vs. Temperature
750
VOUT = 2.6 V
725
700
675
650
625
600
−40
−15 10 35 60
AmbientTemperature (_C)
85
www.vishay.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet Si91841DT-26-T1.PDF ] | |
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