Si91841
Vishay Siliconix
150-mA Ultra Low-Noise LDO Regulator
With Discharge Option
FEATURES
D Ultra Low Dropout—130 mV at 150-mA Load
D Output, Auto-Discharge In Shutdown Mode
D Ultra Low Noise—30 mV(rms) (10-Hz to 100-kHz
D Fixed 1.8, 2.5, 2.6, 2.8, 2.85, 2.9, 3.0, 3.3, 5.0-V Output
Available
Bandwidth)
Voltage Options
D Shutdown Control
D Thin SOT23-5 Package
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)
APPLICATIONS
D Cellular Phones, Wireless Handsets
D Noise-Sensitive Electronic Systems, Laptop and
D Fast Line and Load Transient Response (v 30 ms)
D 1-mA Maximum Shutdown Current
D Output Current Limit
Palmtop Computers
D PDAs
D Pagers
D Reverse Battery Protection
D Digital Cameras
D MP3 Player
D Wireless Modem
D Built-in Short Circuit and Thermal Protection
DESCRIPTION
The Si91841 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
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’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 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.
pull-down circuit is built into the Si91841 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 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 is available in both standard and lead (Pb)-free
packages.
For better transient response and regulation, an active
TYPICAL APPLICATION CIRCUIT
Si91841
5
4
V
1
V
V
V
OUT
IN
IN
OUT
1 mF
1 mF
2
3
GND
SD
SD
BP
10 nF
Thin SOT-23, 5-Lead
Document Number: 71447
S-50956—Rev. D, 16-May-05
www.vishay.com
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