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| 型號： | TPS2459RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數(shù)： | 15/44頁 |
| 文件大?。?/td> | 983K |
| 代理商： | TPS2459RHBR |
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PRODUCTPREVIEW
APPLICATION INFORMATION
The TPS2459 has been designed to simplify compliance with the PICMG-AMC.R2.0 and PICMG-MTCA.0
Introduction
Control Logic and Power-On Reset
SLUS917 – FEBRUARY 2009 ............................................................................................................................................................................................ www.ti.com
specifications. These specifications were developed by the PCI Industrial Computer Manufacturers Group
(PICMG). These two specifications are derivations of the PICMG-ATCA (Advanced Telecommunication
Computing Architecture) specification originally released in December, 2002.
PICMG-AMC Highlights
AMC – Advanced Mezzanine Cards
Designed to Plug into ATCA Carrier Boards
AdvancedMC Focuses on Low Cost
1 to 8 AdvancedMC per ATCA Carrier Board
3.3-V Management Power – Maximum Current Draw of 150 mA
12-V Payload Power – Converted to Required Voltages on AMC
Maximum 80 W Dissipation per AdvancedMC
Hotswap and Current Limiting and must be Present on Carrier Board
For details, see www.picmg.org/
PICMG-MTCA Highlights
MTCA – MicroTelecommunications Computing Architecture
Architecture for Using AMCs without an ATCA Carrier Board
Up to 12 AMCs per System, plus Two MicroTCA Carrier Hub (MCH)s, plus Two Cooling Units (CU)s
Focuses on Low Cost – Commoditizes the Hardware
All Functions of ATCA Carrier Board must be Provided
MicroTCA is also known as MTCA, mTCA, TCA or uTCA
For details, see www.picmg.org/
The TPS2459 controls a 12-V power path and a 3.3-V power path in a 32-pin QFN package. An I2C interface
enables the implementation using one small integrated circuit, but it also provides many opportunities for design
customization. The following sections describe the main functions of the TPS2459 and provide guidance for
designing systems around this device.
The TPS2459 circuitry, including the I2C interface, draws power from an internal bus fed by a preregulator. A
capacitor attached to the VINT pin provides decoupling and output filtering for this preregulator. It can draw
power from either of the two inputs (IN12, IN3) or from either of two outputs (OUT12, OUT3). This feature allows
the internal circuitry to function regardless of which channels receive power, or from what source. The two
external FET drive pins (PASS, BLK) are held low during startup to ensure that the 12-V channel remains off.
The internal 3.3-V channel is also held off. When the voltage on the internal VINT rail exceeds approximately 1
V, the power-on reset circuit loads the internal registers with the default values listed in Detailed Description of
Registers section.
22
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS2459
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