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Texas Instruments TPS2231PW
- Part No.:
- TPS2231PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS2231PW.pdf
- Description:
- IC PWR SWITCH 1:1 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
TPS2231PW 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 host systems requiring compliant hot-plug power sequencing for PCI Express or USB-based ExpressCards.
For engineers reviewing the TPS2231PW datasheet, TPS2231PW pinout, TPS2231PW application, or TPS2231PW equivalent, key selection criteria include its 20-pin TSSOP package, dual-rail current-limiting (1.3 A @ 3.3VOUT, 650 mA @ 1.5VOUT), 2.6–2.9 V 3.3VIN UVLO threshold, PERST assertion timing, and ExpressCard™ compliance verification.
Technical Context
The TPS2231PW integrates three independent MOSFET power switches - one for 3.3VIN→3.3VOUT, one for 1.5VIN→1.5VOUT, and one for AUXIN→AUXOUT - each with internal current-sense circuitry, thermal shutdown (trip at 155–165°C), and discharge FETs. Its control logic implements ExpressCard™-defined power states including OFF, Shutdown, No Card, Standby, and Card Inserted modes.
It features TTL-compatible logic inputs (SHDN, STBY, CPPE, CPUSB, SYSRST), open-drain outputs (PERST, OC, RCLKEN), and voltage monitoring with precise thresholds: 3.3VIN UVLO at 2.6–2.9 V, 1.5VIN UVLO at 1.0–1.25 V, and AUXIN UVLO at 2.6–2.9 V. All outputs are protected against short circuits with deglitched overcurrent detection (6–20 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Package | 20-pin TSSOP (PW), RoHS-compliant, surface-mountable with exposed pad not required for thermal performance |
| 3.3VOUT continuous current | 1.3 A max - sufficient to power ExpressCard modules requiring full 3.3 V rail capability per specification |
| 1.5VOUT continuous current | 650 mA max - meets ExpressCard|34/|54 1.5 V rail requirements under worst-case junction temperature (120°C) |
| AUXOUT continuous current | 275 mA max - supplies auxiliary power and chip bias without external regulation |
| Power switch RDS(on) | 45 mΩ typ @ 25°C (3.3V path) - minimizes conduction loss and self-heating during sustained load |
| Operating temperature | –40°C to +85°C ambient - validated for industrial-grade notebook/desktop host environments |
| UVLO thresholds | 3.3VIN: 2.6–2.9 V; 1.5VIN: 1.0–1.25 V; AUXIN: 2.6–2.9 V - ensures robust startup/shutdown sequencing per ExpressCard standard |
Pinout & Package
TPS2231PW uses a 20-pin TSSOP package (PW suffix). Pin assignments are defined in TI SLVS536A, with no internal connections on pins 1, 9, 12, and 20.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SYSRST | Active-low system reset input - forces PERST assertion without disrupting power rails (warm reset) |
| 2 | SHDN | Active-low shutdown input - disables all power switches and activates output discharge FETs |
| 3 | STBY | Active-low standby input - turns off 3.3V/1.5V outputs while maintaining AUXOUT for low-power card presence |
| 4,5 | 3.3VIN | 3.3 V input supply - only required when 3.3VOUT functionality is needed; monitored for UVLO |
| 6,7 | 3.3VOUT | Switched 3.3 V output - delivers regulated 3.3 V to ExpressCard slot when enabled and within tolerance |
| 8 | PERST | Open-drain power-good/reset output - asserted low until all rails stabilize, then de-asserted after RCLKEN release + delay |
| 10 | GND | Ground reference - common return for all power and logic paths |
| 11 | CPUSB | Card-present input for USB cards - pulled up internally to AUXIN; grounded by USB ExpressCard to enable power |
| 12 | CPPE | Card-present input for PCI Express cards - pulled up internally to AUXIN; grounded by PCIe ExpressCard to enable power |
| 13,14 | 1.5VOUT | Switched 1.5 V output - delivers regulated 1.5 V to ExpressCard slot; includes current limiting and thermal protection |
| 15,16 | 1.5VIN | 1.5 V input supply - only required when 1.5VOUT functionality is needed; monitored for UVLO |
| 17 | AUXOUT | Switched AUX output - provides auxiliary power and internal bias; remains active in Standby mode |
| 18 | AUXIN | AUX input supply - required for all operations; powers internal logic and pulls up CPPE/CPUSB/SHDN/STBY/SYSRST |
| 19 | RCLKEN | Reference clock enable I/O - open-drain output indicating all rails in tolerance; can be driven low by host to delay PERST |
| 20 | OC | Open-drain overcurrent status - asserted low when any rail exceeds current limit, with 6–20 ms deglitch |
Key Features
| Feature | Design Value |
|---|---|
| ExpressCard™ compliance | Fully satisfies ExpressCard|34/|54 Implementation Guidelines and Compliance Checklists - eliminates need for external validation |
| Integrated triple-rail switching | Single-chip solution for 3.3 V, 1.5 V, and AUX power distribution - reduces BOM count and PCB area vs discrete FET + controller |
| Thermal and short-circuit protection | Auto-recovering thermal shutdown (155–165°C trip) and current-limited outputs prevent damage during fault conditions |
| TTL-compatible logic interface | All control inputs accept 0–3.6 V logic levels with internal pullups to AUXIN - simplifies host GPIO interfacing without external resistors |
| Programmable power sequencing | Dual-mode operation (Card Inserted / Standby) enables dynamic rail management based on CPPE/CPUSB and STBY signals |
Applications
| ExpressCard Host Controller | Notebook Computer Expansion Slot |
|---|---|
Use Scenario: Host chipset managing ExpressCard|34/|54 socket with PCI Express or USB interface. IC Role / Device Role / Timing Role: Primary power interface switch controlling 3.3 V, 1.5 V, and AUX rail delivery, PERST generation, and overcurrent signaling. Use Value: Enables hot-plug compliance, eliminates need for discrete power sequencing logic, and guarantees ExpressCard™-specified timing for RCLKEN/PERST transitions. |
Use Scenario: Thin-and-light notebook requiring compact, low-power expansion capability via ExpressCard slot. IC Role / Device Role / Timing Role: Single-chip power manager delivering regulated rails, detecting card presence (CPPE/CPUSB), and asserting PERST for PCIe reset. Use Value: Reduces thermal footprint vs dual-device solutions; supports standby mode to maintain AUX power while disabling 3.3 V/1.5 V for battery conservation. |
| Desktop ExpressCard Adapter | Digital Camera Docking Station |
Use Scenario: Desktop add-in card providing ExpressCard slot for peripheral expansion (e.g., SSD, Wi-Fi). IC Role / Device Role / Timing Role: Power sequencer ensuring correct turn-on order (AUX → 3.3 V → 1.5 V), UVLO enforcement, and fault reporting via OC pin. Use Value: Guarantees stable power-up even with marginal input supplies; built-in discharge FETs safely remove residual charge when card is removed. |
Use Scenario: Docking station connecting digital cameras with ExpressCard interfaces for high-speed data transfer. IC Role / Device Role / Timing Role: Hot-swap power controller enabling safe insertion/removal while maintaining host-side RCLKEN synchronization. Use Value: Prevents bus contention during insertion; PERST coordination ensures camera firmware resets cleanly upon connection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ExpressCard power interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2231PWP | 24-pin PowerPAD™ HTSSOP package with enhanced thermal performance (3153 mW power rating vs 704 mW for PW) | Preferred for thermally constrained designs or higher ambient temperatures where junction rise must be minimized | Select TPS2231PWP when board layout allows larger package and thermal management requires lower θJA |
| TPS2236DAP | Dual-slot ExpressCard power switch in 32-pin HTSSOP; supports two independent slots with separate CPPE/CPUSB/PERST channels | Required for desktop motherboards or docking stations with dual ExpressCard|34/|54 slots | Choose TPS2236DAP only when dual-slot support is mandatory; not pin-compatible or functionally interchangeable with TPS2231PW |
Compared with TPS2231PWP, the TPS2231PW offers lower thermal capacity but smaller footprint; compared with TPS2236DAP, it provides single-slot functionality with simpler control logic and reduced pin count - making TPS2231PW optimal for cost- and space-sensitive notebook host designs.
Availability
TPS2231PW is available at Aetrix Electronics and suitable for notebook computers, desktop ExpressCard adapters, and digital camera docking stations requiring stable component supply, ExpressCard™ compliance, and integrated triple-rail power switching.
Supply support for TPS2231PW 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 expertise in power management ICs for computing and communications infrastructure.
The TPS2231PW belongs to TI's ExpressCard™ power interface switch product line, designed specifically to simplify host-side implementation of ExpressCard|34 and ExpressCard|54 specifications while ensuring robust hot-plug reliability and thermal safety.
FAQ
What is the primary function of the TPS2231PW in an ExpressCard host system?
The TPS2231PW serves as the dedicated power interface switch for single-slot ExpressCard|34 or ExpressCard|54 hosts. It manages the distribution of 3.3 V, 1.5 V, and AUX power rails to the card socket, enforces ExpressCard™-defined sequencing, generates PERST and RCLKEN signals, and provides overcurrent and thermal protection - all within one integrated IC.
Does the TPS2231PW require external components to meet ExpressCard™ compliance?
No. The TPS2231PW is designed to meet ExpressCard™ Implementation Guidelines and Compliance Checklists without external timing or protection components. Its internal UVLO thresholds, PERST assertion/de-assertion delays, RCLKEN release timing, and current-limiting behavior are factory-characterized to satisfy the standard - though proper PCB layout (e.g., decoupling, grounding) remains essential.
How does the TPS2231PW handle card removal and insertion events?
Upon card removal, the TPS2231PW detects loss of CPPE or CPUSB low signal, enters No Card mode, disables all power switches, and activates output discharge FETs to safely bleed residual voltage from 3.3VOUT, 1.5VOUT, and AUXOUT. Upon reinsertion, it transitions to Card Inserted mode, re-enables rails in sequence, and asserts PERST until stabilization.
Can the TPS2231PW operate if only AUXIN is present, without 3.3VIN or 1.5VIN?
Yes. With only AUXIN applied, the TPS2231PW powers its internal logic and pulls up SHDN, STBY, CPPE, and CPUSB via internal resistors. In this state, it remains in OFF mode - no power is delivered to the card - but is ready to activate 3.3VOUT or 1.5VOUT immediately upon application of their respective input voltages and detection of card presence.
What is the role of the RCLKEN pin on the TPS2231PW, and how should it be used?
RCLKEN is a bidirectional pin: as an output, it goes high (pulled up to AUXIN) once all rails are stable, signaling host clock drivers to enable; as an input, it can be held low by the host to delay PERST de-assertion. It must never be actively driven high - only pulled low or left floating - due to its internal discharge FET structure.
TPS2231PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Bulk
- 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-TSSOP
TPS2231PW FAQ
1.How can I place an order for TPS2231PW through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2231PW 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 TPS2231PW reliable?
The price and inventory of TPS2231PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2231PW is usually 5 days.
3.What payment methods are accepted for TPS2231PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2231PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2231PW?
TPS2231PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2231PW 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 TPS2231PW?
For technical support, including TPS2231PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2231PW requirements.
6.How does Aetrix verify that TPS2231PW is sourced from the original manufacturer or authorized distributors?
All TPS2231PW 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 TPS2231PW meets industry standards.
7.What is the process for return or replacement of TPS2231PW?
All TPS2231PW units undergo pre-shipment inspection (PSI). If there is an issue with TPS2231PW, 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 TPS2231PW part is unused and in its original packaging.
Return procedure for TPS2231PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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