Vishay Si91872 Data Handbook/Manual
Summary
The Si91872 is an ultra-low dropout (300mV) LDO regulator designed for powering sensitive, battery-operated portable electronics. This manual provides comprehensive technical specifications covering core features such as low noise performance, auto-discharge capability, reverse battery protection, and high transient response. It is essential reading for electrical engineers selecting reliable power management solutions for applications like cellular devices, PDAs, and digital cameras.
Page 1 Text Content
查询SI91872DMP-30-E3供应商
Si91872 Vishay Siliconix
300-m A Low-Noise LDO Regulator With Error Flag and Discharge Option
FEATURES
Ultra Low Dropout—300 m V at 300-m A Load Output—Auto-Discharge In Shutdown Mode Low Noise—75 VRMS (10-Hz to 100-k Hz) Fixed 1.2, 1.8, 2.5, 2.6, 2.8, 3.0, 3.3, 5.0-V Output
Available
Out-of-Regulation Error Flag (power good) Voltage Options Shutdown Control MLP33-5 Power PAK Package
130-A Ground Current at 300-m A Load Fast Start-Up (50 S) APPLICATIONS 1.5% Guaranteed Output Voltage Accuracy
Cellular Phones, Wireless Handsets
400-m A Peak Output Current Capability
Noise-Sensitive Electronic Systems, Laptop and
Uses Low ESR Ceramic Capacitors
Palmtop Computers
Fast Line and Load Transient Response ( 30 s)
1-A Maximum Shutdown Current
Pagers
Output Current Limit
Digital Cameras
Reverse Battery Protection
MP3 Player
Built-in Short Circuit and Thermal Protection
Wireless Modem
DESCRIPTION
The Si91872 is a 300-m A CMOS LDO (low dropout) voltage voltage when it rises beyond normal regulation. The Si91872 regulator. It is the perfect choice for low voltage, low power automatically discharges the output voltage by connecting the applications. An ultra low ground current and ultra fast turn-on output to ground through a 100- n-channel MOSFET when make this part attractive for battery operated power systems. the device is put in shutdown mode. The Si91872 also offers ultra low dropout voltage to prolong
battery life in portable electronics. Systems requiring a quiet The Si91872 features reverse battery protection to limit voltage source will benefit from the Si91872’s low output noise. reverse current flow to approximately 1-A in the event The Si91872 is designed to maintain regulation while reversed battery is applied at the input, thus preventing delivering 400-m A peak current, making it ideal for systems damage to the IC.
that have a high surge current upon turn-on.
The Si91872 is available in both the standard and lead (Pb)-free 5-pin MLP33 Power PAK packages and is For better transient response and regulation, an active specified to operate over the industrial temperature range of
pull-down circuit is built into the Si91872 to clamp the output −40C to 85.
TYPICAL APPLICATION CIRCUIT
Si91872
VIN VIN VOUT VOUT
SD SD 51 k
GND ERROR ERROR
MLP33-5
Document Number: 72013 www.vishay.com S-51147—Rev. F, 20-Jun-05
Page Summary Contents For Vishay Si91872 Data Handbook/Manual
Manual Details
| Brand | Vishay |
|---|---|
| Pages | 10 |
| File Size | 114.32 KB |
| Published | June 02, 2026 |
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Frequently Asked Questions
Does the Si91872 automatically manage power during shutdown cycles?
Yes, it features auto-discharge in shutdown mode by connecting the output to ground.
What types of protection does this regulator offer for battery systems?
It includes built-in short circuit, thermal protection, and vital reverse battery protection.
Is this LDO suitable for noise-sensitive electronic equipment?
Yes, it offers low output noise (75 µV) and is ideal for devices like PDAs and wireless handsets.
What are the fixed voltage options available for the Si91872?
It provides selection between 1.2V, 1.8V, 2.5V, 2.6V, 2.8V, 3.0V, 3.3V, and 5.0V outputs.