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Si9177

Features: ` 2.7-V to 6-V Input Voltage Range` 1.2-V to 5-V Output` Efficiency of 95% for VOUT of 3.3 V @ 200-mA Load` Selectable Pulse Skipping Modulation (PSM) or Bypass Mode (BP) Operation` 150-m Bypass Switch for 800-mA Loads` Integrated MOSFET with Low External Part Count` Shutdown Current <...

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SeekIC No. : 004490918 Detail

Si9177: Features: ` 2.7-V to 6-V Input Voltage Range` 1.2-V to 5-V Output` Efficiency of 95% for VOUT of 3.3 V @ 200-mA Load` Selectable Pulse Skipping Modulation (PSM) or Bypass Mode (BP) Operation` 150-m ...

Si9177 Data Sheet

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Part Number:
Si9177
Supply Ability:
5000

Price Break

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

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Product Details

Description



Features:

`  2.7-V to 6-V Input Voltage Range
`  1.2-V to 5-V Output
`  Efficiency of 95% for VOUT of 3.3 V @ 200-mA Load
`  Selectable Pulse Skipping Modulation (PSM) or Bypass Mode (BP) Operation
`  150-m Bypass Switch for 800-mA Loads
`  Integrated MOSFET with Low External Part Count
`  Shutdown Current <1 A
`  Integrated UVLO and Power on Reset
`  Integrated Soft-Start
`  Over Temperature Protection
`  MLP33-10 or MSOP-10 Packages


Application

·  Cellular Phones, Cordless Phones
·  Computer Point of Use, Notebook
·  PDAs
·  Battery Powered Devices
·  MP3 Players


Pinout

Connection Diagram


Specifications

VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V
BP/PSM, ENABLE, FB, LX . . . . . . . . . . . . . . . . . ...... .. . .  . . -0.3 V to VIN + 0.3 V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . 150
Power Dissipation (Package)a.
MLP33-10b. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481 mW
MSOP-10c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 915 mW
Thermal Impedance (JA)
MLP33-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . 135/W
MSOP-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.4 mW/ above 25
c. Derate 14 mW/ above 25.

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.


Description

The Si9177 is a dual-mode power adjustable output converter. When it is set to PSM mode, the Si9177 operates as a pulse-skipping-modulation controlled step-down (buck) converter with an output voltage range of 1.2 V to 5 V. It has an integrated MOSFET, capable of supplying 200-mA load current with a 1.5-H inductor. The output voltage is adjusted by a resistive divider on the FB pin. The typical conversion efficiency is above 90%. A logic HIGH at the BP/PSM pin puts Si9177 in bypass mode. The main PMOS buck switch is forced to turn on at 100% duty cycle, overriding the FB signal. The voltage differential between input and output is the resistive voltage drop on the internal 150-m PMOS and the inductor.  The Si9177 delivers 800-mA load in bypass mode.

The Si9177 is available in the space saving MLP33-10 and MSOP-10 packages. In order to satisfy the stringent ambient temperature requirements, the Si9177 is rated to handle the industrial temperature range of -25 to 85




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