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Texas Instruments TPS2231RGPT
- Part No.:
- TPS2231RGPT
- Manufacturer:
- Texas Instruments
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
TPS2231RGPT.pdf
- Description:
- IC PWR SWITCH 1:1 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
TPS2231RGPT from Texas Instruments is a single-slot ExpressCard™ power interface switch IC that distributes and regulates 3.3 V, 1.5 V, and AUX power rails to ExpressCard|34/|54 sockets with integrated current limiting, thermal protection, and undervoltage lockout. It supports notebook and desktop computers requiring compliant hot-plug power sequencing for PCI Express and USB-based ExpressCards.
For engineers reviewing the TPS2231RGPT datasheet, TPS2231RGPT pinout, TPS2231RGPT application, or TPS2231RGPT equivalent, key selection criteria include its 24-pin PowerPAD™ HTSSOP package, 1.3 A 3.3VOUT continuous current rating, dual-channel card-present detection (CPPE/CPUSB), PERST/RCLKEN timing coordination, and ExpressCard™ compliance across –40°C to 85°C ambient operation.
Technical Context
The TPS2231RGPT implements three independent MOSFET power switches - one each for 3.3VIN→3.3VOUT, 1.5VIN→1.5VOUT, and AUXIN→AUXOUT - each with internal current-limit sensing, thermal shutdown (trip at 155–165°C), and discharge FETs for safe rail ramp-down. Its control logic interprets CPPE/CPUSB, SHDN, STBY, and SYSRST to enforce ExpressCard™ power-state transitions including No Card, Card Inserted, Standby, and Shutdown modes.
It features tightly coupled timing functions: RCLKEN releases only after all outputs reach tolerance, triggering a programmable delay before PERST de-assertion; PERST asserts within 500 ns of any output falling out of spec or SYSRST activation; and OC provides open-drain overcurrent status with 6–20 ms deglitching. UVLO thresholds (e.g., 2.6–2.9 V for 3.3VIN) prevent erratic switching during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Package | 24-pin PowerPAD™ HTSSOP (PWP) - enables high thermal dissipation (3153 mW at TA = 25°C) via exposed pad soldering. |
| 3.3VOUT Continuous Current | 1.3 A - sufficient to power full ExpressCard|54 modules with PCI Express x1 interface and auxiliary circuitry. |
| 1.5VOUT Continuous Current | 650 mA - supports DDR2/DDR3 memory interfaces on ExpressCard modules requiring 1.5 V supply. |
| AUXOUT Continuous Current | 275 mA - delivers auxiliary power for card presence detection, clock enable, and low-power standby functions. |
| Input Voltage Ranges | 3.3VIN: 3.0–3.6 V; 1.5VIN: 1.35–1.65 V; AUXIN: 3.0–3.6 V - ensures stable operation within ExpressCard™ specification tolerances. |
| Thermal Shutdown Trip | 155–165°C junction temperature - protects against sustained overload or poor PCB thermal design without latch-up. |
| PERST Assertion Delay | <500 ns from output voltage fall or SYSRST assertion - meets ExpressCard™ timing requirement for immediate reset signaling. |
Pinout & Package
TPS2231RGPT is housed in a 24-pin PowerPAD™ HTSSOP (PWP) package with thermal pad exposed on underside for PCB heat sinking. Pin 1 is located at top-left corner (notch-marked side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYSRST | System Reset Input | Active-low host signal that forces immediate PERST assertion without disrupting power rails - enables warm reset of ExpressCard module. |
| SHDN | Shutdown Input | Active-low command that disables all power switches and activates discharge FETs - used for system-level power-off sequencing. |
| STBY | Standby Input | Active-low signal that turns off 3.3V/1.5V outputs while retaining AUXOUT - maintains card presence and clock enable during low-power states. |
| CPPE / CPUSB | Card Present Inputs | Open-drain inputs pulled up to AUXIN; low indicates PCI Express or USB card insertion - enables automatic power rail activation per ExpressCard™ protocol. |
| RCLKEN | I/O Reference Clock Enable | Open-drain output (power-good indicator) or input (host-controlled delay); must never be driven high externally - coordinates clock enable timing with PERST release. |
| PERST | Power Reset Output | Open-drain logic-level output asserting low until all rails are in tolerance and RCLKEN is released - serves as ExpressCard™ power-good and reset signal. |
| OC | Overcurrent Status Output | Open-drain output asserted low during overcurrent on any rail (3.3V/1.5V/AUX) with 6–20 ms deglitch - enables host fault logging and graceful shutdown. |
| 3.3VIN / 1.5VIN / AUXIN | Power Inputs | Independent supply inputs with dedicated UVLO thresholds - decouples failure modes and allows partial power loss without full system collapse. |
| 3.3VOUT / 1.5VOUT / AUXOUT | Switched Outputs | High-side MOSFET outputs delivering regulated voltages to ExpressCard slot; include internal discharge FETs for controlled ramp-down when card removed. |
| GND | Ground Reference | Common return path for all power and logic circuits - requires low-impedance connection to PCB ground plane for noise immunity and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| ExpressCard™ Compliance | Fully satisfies ExpressCard|34/|54 implementation guidelines, compliance checklists, and power-state transition requirements - eliminates need for external validation. |
| Triple Independent Power Switches | Separate 3.3V, 1.5V, and AUX output channels with individual current limit, thermal shutdown, and discharge FETs - prevents single-point failure from propagating across rails. |
| Integrated Timing Coordination | RCLKEN-to-PERST delay and PERST response to SYSRST or rail faults meet ExpressCard™ timing budgets without external logic or timers. |
| TTL-Logic Compatible I/O | All digital pins operate at 3.3 V logic levels with 10 mA sink/source capability - interfaces directly with standard host chipset GPIOs without level-shifting. |
| Robust Fault Protection | Short-circuit current limits (e.g., 2.5 A steady-state 3.3VOUT), thermal shutdown with hysteresis, and UVLO on all inputs - sustains operation under transient overloads and brownouts. |
Applications
| PCI Express ExpressCard Slot | USB ExpressCard Slot |
|---|---|
Use Scenario: Notebook computer hosting a PCIe-based Wi-Fi or SSD expansion card via ExpressCard|54 slot. IC Role / Device Role / Timing Role: TPS2231RGPT acts as the primary power interface switch, enabling hot-plug insertion, sequencing 3.3 V/1.5 V/AUX rails, and generating PERST/RCLKEN signals synchronized to card presence. Use Value: Ensures PCIe link training begins only after all rails stabilize and PERST is de-asserted - preventing enumeration failures and bus errors during card insertion. | Use Scenario: Desktop add-in card providing USB 2.0 host controller functionality through ExpressCard|34 interface. IC Role / Device Role / Timing Role: TPS2231RGPT supplies 3.3 V and AUX power, detects USB card presence via CPUSB, and asserts PERST to initialize USB PHY upon insertion. Use Value: Guarantees USB device enumeration starts only after stable 3.3 V rail and valid PERST de-assertion - eliminating enumeration timeouts and port disable events. |
| Notebook Computer ExpressCard Bay | Digital Camera ExpressCard Reader |
Use Scenario: Ultrabook with built-in ExpressCard|34 slot supporting multiple card types (PCIe, USB, legacy). IC Role / Device Role / Timing Role: TPS2231RGPT manages dynamic rail enablement based on CPPE/CPUSB state, enters Standby mode on STBY assertion, and handles SYSRST-triggered warm resets. Use Value: Reduces system power consumption by disabling 3.3 V/1.5 V rails while maintaining AUXOUT for card presence monitoring - extends battery life without losing card detection. | Use Scenario: Portable digital camera with ExpressCard reader for direct photo transfer from SD/CF adapters. IC Role / Device Role / Timing Role: TPS2231RGPT powers the reader's bridge IC and USB transceiver, monitors card removal via CPPE/CPUSB de-assertion, and discharges rails using internal FETs. Use Value: Prevents data corruption by ensuring clean rail ramp-down and PERST reassertion within 500 ns of card ejection - maintains file system integrity during hot removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ExpressCard power interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2231PW | 20-pin TSSOP package; lower thermal dissipation (704 mW vs. 3153 mW); no PowerPAD™ thermal enhancement. | Suitable for space-constrained designs where thermal load is light and PCB copper area for heat spreading is limited. | Select TPS2231PW only if ambient temperature remains ≤60°C and peak 3.3VOUT current stays below 800 mA - verify thermal margin with JEDEC low-k board simulation. |
| TPS2236DAP | 32-pin PowerPAD™ HTSSOP; dual-slot ExpressCard support with separate 3.3V/1.5V/AUX outputs per slot and additional CPPE2/CPUSB2/PERST2 pins. | Required for desktop motherboards or docking stations supporting two simultaneous ExpressCard slots. | TPS2236DAP is not a drop-in replacement; requires PCB layout changes for extra pins and dual-rail routing - use only when dual-slot functionality is mandatory. |
Compared with TPS2231PW, TPS2231RGPT delivers 4.5× higher thermal power handling and robustness for full-load ExpressCard|54 operation; compared with TPS2236DAP, it reduces BOM cost and layout complexity for single-slot systems while retaining identical functional timing and protection features.
Availability
TPS2231RGPT is available at Aetrix Electronics and suitable for notebook computers, desktop add-in cards, and portable digital cameras requiring stable component supply, ExpressCard™ compliance, and integrated power sequencing with fault protection.
Supply support for TPS2231RGPT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with decades of experience in power management and interface solutions.
The TPS223x product line was designed specifically to address ExpressCard™ power interface requirements - delivering fully integrated, standards-compliant power switches with precise timing, robust protection, and minimal external component count for host systems.
FAQ
What is the function of the RCLKEN pin on the TPS2231RGPT?
The RCLKEN pin on the TPS2231RGPT serves as a bidirectional signal: as an output, it transitions high after all power rails (3.3VOUT, 1.5VOUT, AUXOUT) reach tolerance, initiating the PERST de-assertion timer; as an input, it can be held low by the host to delay PERST release. It must never be actively driven high - only pulled up via internal AUXIN-connected resistor or external pull-up. This dual role enables precise coordination between reference clock enable and system reset timing in ExpressCard™ implementations.
How does the TPS2231RGPT handle card removal events?
Upon card removal, the TPS2231RGPT detects loss of CPPE and/or CPUSB low state, immediately disables all power switches (3.3VOUT, 1.5VOUT, AUXOUT), and activates internal discharge FETs to rapidly ramp down output voltages. This "break-before-make" sequence ensures no back-driving into the card, while PERST is reasserted within 500 ns to signal power instability to the ExpressCard module. The discharge FETs remain active until SHDN is de-asserted or new card presence is detected.
What are the UVLO thresholds for each input on the TPS2231RGPT?
The TPS2231RGPT features three independent undervoltage lockout (UVLO) comparators: 3.3VIN UVLO triggers at 2.6–2.9 V (hysteresis 100 mV), disabling 3.3VOUT and 1.5VOUT; 1.5VIN UVLO triggers at 1.0–1.25 V, disabling 3.3VOUT and 1.5VOUT; AUXIN UVLO triggers at 2.6–2.9 V, disabling all outputs including AUXOUT. These thresholds ensure reliable power sequencing and prevent erratic switching during input brownouts - critical for ExpressCard™ hot-plug reliability.
Can the TPS2231RGPT support both PCI Express and USB ExpressCards simultaneously?
No - the TPS2231RGPT supports either PCI Express or USB ExpressCards, determined by which card-present input (CPPE or CPUSB) is asserted low upon insertion. Both inputs are internally pulled up to AUXIN; only one needs to be grounded by the card to activate power rails. The device does not differentiate protocol during operation - it simply enables the same 3.3 V, 1.5 V, and AUX outputs regardless of CPPE/CPUSB state. Dual-protocol support is handled at the system level via host software and PCIe/USB controller configuration.
What is the maximum continuous current rating for the 1.5VOUT channel of the TPS2231RGPT?
The 1.5VOUT channel of the TPS2231RGPT is rated for 650 mA continuous output current at TJ = 120°C, as specified in the Recommended Operating Conditions table. This rating assumes proper PCB thermal design with the PowerPAD™ soldered to a thermal plane. At 25°C ambient with optimal heatsinking, the channel can sustain higher transient loads, but 650 mA represents the guaranteed steady-state limit across the full –40°C to 120°C junction temperature range.
TPS2231RGPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-VFQFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Type:
- ExpressCard™ Switch
- Number of Outputs:
- 3
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- -
- Interface:
- -
- Voltage - Load:
- 1.5V, 3.3V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 1.3A
- Rds On (Typ):
- 45mOhm
- Input Type:
- -
- Features:
- Power Good, Status Flag
- Fault Protection:
- Current Limiting (Fixed), Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
TPS2231RGPT FAQ
1.How can I place an order for TPS2231RGPT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2231RGPT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS2231RGPT reliable?
The price and inventory of TPS2231RGPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2231RGPT is usually 5 days.
3.What payment methods are accepted for TPS2231RGPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2231RGPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2231RGPT?
TPS2231RGPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2231RGPT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS2231RGPT?
For technical support, including TPS2231RGPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2231RGPT requirements.
6.How does Aetrix verify that TPS2231RGPT is sourced from the original manufacturer or authorized distributors?
All TPS2231RGPT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS2231RGPT meets industry standards.
7.What is the process for return or replacement of TPS2231RGPT?
All TPS2231RGPT units undergo pre-shipment inspection (PSI). If there is an issue with TPS2231RGPT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS2231RGPT part is unused and in its original packaging.
Return procedure for TPS2231RGPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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