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SI91844DT-27-T1

Description
150-mA Low-Noise LDO Regulator With Error Flag and Discharge Option
CategoryPower/power management    The power supply circuit   
File Size79KB,9 Pages
ManufacturerVishay
Websitehttp://www.vishay.com
Download Datasheet Parametric View All

SI91844DT-27-T1 Overview

150-mA Low-Noise LDO Regulator With Error Flag and Discharge Option

SI91844DT-27-T1 Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
MakerVishay
Parts packaging codeSOT-23
package instruction,
Contacts5
Reach Compliance Codeunknow
Si91842/4
New Product
Vishay Siliconix
150-mA Low-Noise LDO Regulator
With Error Flag and Discharge Option
FEATURES
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Ultra Low Dropout—130 mV at 150-mA Load
Low Noise—75
mV
(rms)
(10-Hz to 100-kHz Bandwidth)
Out-of-Regulation Error Flag (power good)
Shutdown Control
110-mA Ground Current at 150-mA Load
Fast Start-Up (50
mS)
1.5% Guaranteed Output Voltage Accuracy (1.2 V, 2%)
300-mA Peak Output Current Capability
Uses Low ESR Ceramic Capacitors
Fast Line and Load Transient Response (v 30
ms)
1-mA Maximum Shutdown Current
Output Current Limit
Reverse Battery Protection
Built-in Short Circuit and Thermal Protection
D
Si91842: Output—Auto-Discharge In Shutdown Mode
D
Si91844: Output—No-Discharge In Shutdown Mode
D
Fixed 1.2, 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
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 Si91842/4 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 and ultra fast turn-on
make this part attractive for battery operated power systems.
The Si91842/4 also offers ultra low dropout voltage to prolong
battery life in portable electronics. Systems requiring a quiet
voltage source will benefit from the Si91842/4’s low output
noise. The Si91842/4 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 Si91842/4 to clamp the output
voltage when it rises beyond normal regulation. The Si91842
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 Si91842/4 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.
TYPICAL APPLICATION CIRCUIT
Si91842/4
V
IN
1
mF
2
GND
5
51 kW
1
V
IN
V
OUT
5
V
OUT
1
mF
SD
3
SD
ERROR
4
ERROR
SOT-23, 5-Lead
Document Number: 71732
S-20478—Rev. C, 01-Apr-02
www.vishay.com
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