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Si91841

Features: `Ultra Low Dropout-130 mV at 150-mA Load`Ultra Low Noise-30 V(rms) (10-Hz to 100-kHz Bandwidth)`Shutdown Control`110-A Ground Current at 150-mA Load`1.5% Guaranteed Output Voltage Accuracy`300-mA Peak Output Current Capability`Uses Low ESR Ceramic Capacitors`Fast Start-Up (50 s)`Fast Lin...

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SeekIC No. : 004490941 Detail

Si91841: Features: `Ultra Low Dropout-130 mV at 150-mA Load`Ultra Low Noise-30 V(rms) (10-Hz to 100-kHz Bandwidth)`Shutdown Control`110-A Ground Current at 150-mA Load`1.5% Guaranteed Output Voltage Accuracy...

Si91841 Data Sheet

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Part Number:
Si91841
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2025/12/25

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Product Details

Description



Features:

`Ultra Low Dropout-130 mV at 150-mA Load
`Ultra Low Noise-30 V(rms) (10-Hz to 100-kHz Bandwidth)
`Shutdown Control
`110-A Ground Current at 150-mA Load
`1.5% Guaranteed Output Voltage Accuracy
`300-mA Peak Output Current Capability
`Uses Low ESR Ceramic Capacitors
`Fast Start-Up (50 s)
`Fast Line and Load Transient Response ( 30 s)
`1-A Maximum Shutdown Current
`Output Current Limit
`Reverse Battery Protection
`Built-in Short Circuit and Thermal Protection
`Si91841: Output, Auto-Discharge In Shutdown Mode
`Si91843: Output, No-Discharge In Shutdown Mode
`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
` Thin SOT23-5 Package




Application

· Cellular Phones, Wireless Handsets
·Noise-Sensitive Electronic Systems, Laptop and Palmtop Computers
·PDAs
·Pagers
·Digital Cameras
·MP3 Player
·Wireless Modem




Pinout

Connection Diagram




Specifications

Input Voltage, VIN to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . .−6.0 to 6.5 V
VSD (See Detailed Description) . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VIN
Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . .Short Circuit Protected
Output Voltage, VOUT . . . . . . . . . . . . . . . . . . . . . . . . .−0.3 V to VIN + 0.3 V
Package Power Dissipation, (Pd)b . . . . . . . . . . . . . . . . . . . . . . . . . . 440 mW
Package Thermal Resistance, (JA)a . . . . . . . . . . . . . . . . . . . . . . . . 180/W
Maximum Junction Temperature, TJ(max) . . . . . . . . . . . . . . . . . . . . . . .150
Storage Temperature, TSTG . . . . . . . . . . . . . . . . . . . . . . . . . .−65 to 150
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 5.5 mW/ above TA = 70




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. It  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- 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-A 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.






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