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Texas Instruments TPS2228DB
- Part No.:
- TPS2228DB
- Manufacturer:
- Texas Instruments
- Package:
- 30-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
TPS2228DB.pdf
- Description:
- IC PWR SWITCH 3:4 30SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,766
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Product details
Overview
TPS2228DB from Texas Instruments is a dual-slot PC Card power interface switch with serial control, designed for CableCARD™ and PCMCIA controller applications. It delivers independently programmable 3.3 V (xVCC), 5 V (xVCC), and 1.8 V/3.3 V/5 V (xVPP/VCORE) to two card slots, features break-before-make switching, thermal shutdown (155°C trip), and overcurrent protection with open-drain OC output. Used in notebook computers and digital cameras requiring compliant PC Card power sequencing.
For engineers reviewing the TPS2228DB datasheet, TPS2228DB pinout, TPS2228DB application, or TPS2228DB equivalent, key selection considerations include its 30-pin DB package, dual-channel serial-interface architecture, independent VPP/VCORE voltage programming, UVLO thresholds (3.3VIN: 2.2–2.9 V), and thermal/current-limit response times under load conditions.
Technical Context
The TPS2228DB implements a dual-channel, serially controlled power-switching architecture supporting simultaneous S-CARD and M-CARD operation per PC Card standards. Its internal logic accepts 3-bit address + 8-bit data via CLOCK/DATA/LATCH signals to configure each of two independent switch banks (A and B), each with separate xVCC and xVPP/VCORE outputs.
Each channel integrates independent current limiting (1 A xVCC, 120–1250 mA xVPP/VCORE depending on input source), thermal shutdown with hysteresis (10°C), and UVLO monitoring per input rail (3.3VIN, 5VIN, 1.8VIN). Switch resistance ranges from 72 mΩ (3.3VIN→xVCC, 25°C) to 1.6 Ω (5VIN→xVPP/VCORE, 100°C), enabling precise power delivery across temperature and load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Package | 30-pin DB (SSOP), 0.65 mm pitch, JEDEC MO-153 compliant |
| Input Voltage Ranges | 3.3VIN: 3.0–3.6 V (required for operation); 5VIN: 2.7–5.5 V; 1.8VIN: 1.7–5.5 V |
| Output Current Limits | xVCC: 1 A (3.3VIN/5VIN); xVPP/VCORE: 120 mA (5VIN), 500 mA (3.3VIN), 680 mA (1.8VIN) at 25°C |
| Switch On-Resistance | 72 mΩ (3.3VIN→xVCC, 25°C); 196 mΩ (3.3VIN→xVPP/VCORE, 25°C); 950 mΩ (5VIN→xVPP/VCORE, 25°C) |
| Thermal Protection | Primary shutdown at TJ ≥155°C; secondary overcurrent-triggered shutdown at TJ ≥120°C; 10°C hysteresis |
| Quiescent Current | 95 µA typical on 3.3VIN input (dual-serial configuration) |
| UVLO Thresholds | 3.3VIN: 2.2–2.9 V; 5VIN: 2.0–2.6 V; 1.8VIN: 1.25–1.62 V - ensures safe power-up/down sequencing |
Pinout & Package
TPS2228DB uses a 30-pin SSOP (DB) package with 0.65 mm lead pitch, optimized for high-density PC Card host designs. Pin assignments support dual-slot serial control with dedicated AVCC/BVCC and AVPP/VCORE/BVPP/VCORE outputs, plus isolated 3.3VIN/5VIN/1.8VIN inputs and system-level signals (CLOCK, DATA, LATCH, RESET, SHDN, OC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 30 | 5VIN | 5-V input supply for xVCC and xVPP/VCORE outputs; must be present for 5-V card operation |
| 6, 28 | 1.8VIN | 1.8-V input for xVPP/VCORE; pins externally tied; enables low-voltage core power delivery |
| 15, 16, 17 | 3.3VIN | Mandatory 3.3-V supply for device logic, xVCC, and xVPP/VCORE; powers internal circuitry |
| 3, 4, 5 | DATA, CLOCK, LATCH | Serial interface control: 3-wire bus for configuring both A/B channels independently |
| 8, 23 | AVPP/VCORE, BVPP/VCORE | Independent switched outputs delivering 0/1.8/3.3/5 V to Slot A and Slot B VPP/VCORE lines |
| 9–11, 20–22 | AVCC, BVCC | Independent switched outputs delivering 0/3.3/5 V to Slot A and Slot B VCC lines |
| 12 | GND | Power ground reference; single-point connection required for noise-sensitive PC Card interface |
| 14, 25 | RESET, SHDN | Asynchronous active-low controls: RESET forces all switches off + discharge; SHDN places outputs in Hi-Z |
| 18 | OC | Open-drain overcurrent status flag; sinks current when any output exceeds its current limit |
Key Features
| Feature | Design Value |
|---|---|
| Dual-slot serial control | Single 3-wire interface configures two independent switch banks (A/B), reducing PCB routing vs parallel alternatives |
| Independent VPP/VCORE programming | Each slot's VPP/VCORE can be set to 1.8 V, 3.3 V, or 5 V regardless of VCC setting - essential for mixed-voltage CableCARD™ cards |
| Break-before-make switching | Prevents short-circuit transients during voltage transitions between 3.3 V and 5 V rails on same output line |
| Per-output overcurrent protection | Individual current limiting per xVCC and xVPP/VCORE output avoids system-wide shutdown during single-slot fault |
| Thermal shutdown with hysteresis | Two-tier thermal protection: 155°C device protection + 120°C overcurrent-triggered channel disable, with 10°C recovery margin |
| UVLO per input rail | Independent undervoltage lockout on 3.3VIN, 5VIN, and 1.8VIN prevents erratic behavior during brownout or ramp-up |
Applications
| CableCARD™ Host Interface | Notebook PC Card Slot Controller |
|---|---|
|
Use Scenario: CableCARD™ module insertion into set-top box or DVR requires compliant 1.8 V/3.3 V/5 V power sequencing and overcurrent isolation. IC Role / Device Role / Timing Role: TPS2228DB acts as dual-rail power manager, delivering independent VCC and VPP/VCORE to primary and backup CableCARD™ slots with serial configuration. Use Value: Enables hot-plug compliance and fault containment: a shorted CableCARD™ only disables its assigned slot, preserving host system stability. |
Use Scenario: Notebook PCs with dual PCMCIA slots require independent power control for modem and wireless LAN cards operating at different voltages. IC Role / Device Role / Timing Role: TPS2228DB provides two fully isolated switch banks (A/B), each with dedicated xVCC and xVPP/VCORE outputs and serial addressability. Use Value: Reduces component count vs discrete solutions; supports mixed 3.3 V/5 V card combinations without shared rail interference. |
| Digital Camera PC Card Reader | Industrial PDA Expansion Module |
|
Use Scenario: Portable digital cameras use PC Card readers to accept CompactFlash or Secure Digital adapters, demanding low quiescent current and fast fault response. IC Role / Device Role / Timing Role: TPS2228DB supplies regulated 3.3 V to CF slot while managing VPP for legacy flash programming, with 95 µA quiescent draw. Use Value: Extends battery life via ultra-low standby current; OC pin alerts MCU to card faults before battery drain occurs. |
Use Scenario: Industrial PDAs add GPS, RFID, or barcode scanning via PCMCIA expansion - requiring robust overtemperature and overcurrent protection in harsh environments. IC Role / Device Role / Timing Role: TPS2228DB delivers 3.3 V/5 V power with dual thermal shutdown (155°C device, 120°C channel) and per-output current limiting. Use Value: Prevents field failures due to connector shorts or ambient heat: thermal events trigger localized shutdown, not full system reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PC Card power interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS2228PWP | 20-pin HTSSOP package; identical dual-serial functionality, lower thermal dissipation rating (2300 mW vs 821 mW at TA=25°C) | Preferred for space-constrained designs where thermal budget allows; lacks pin compatibility with DB-30 layout | Select TPS2228PWP when board area is critical and junction temperature remains below 100°C under worst-case load. |
| TPS2221PWP | 14-pin HTSSOP, single-slot parallel interface; no serial bus; fixed VPP/VCORE assignment per slot; 64 µA quiescent current | Targeted at cost-sensitive single-slot systems without CableCARD™ or dual-slot requirements | Choose TPS2221PWP only for single-slot, non-serial applications where parallel control (VD0–VD3) suffices and dual-channel capability is unnecessary. |
Compared with TPS2228PWP and TPS2221PWP, the TPS2228DB uniquely supports dual-slot serial control in a 30-pin SSOP package with higher thermal margin for dense host layouts, while maintaining full functional equivalence to the TPS2228 family specification.
Availability
TPS2228DB is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and industrial PDAs requiring stable component supply, long-term lifecycle support, and PCMCIA-compliant power management.
Supply support for TPS2228DB 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 ICs for computing and communications.
The TPS2228DB belongs to TI's PC Card power interface switch product line, engineered specifically to meet PCMCIA and CableCARD™ specifications for dual-slot, multi-voltage, fault-protected power delivery in portable and embedded host systems.
FAQ
What is the primary function of the TPS2228DB in a PC Card system?
The TPS2228DB serves as a dual-slot PC Card power interface switch that delivers independently programmable 3.3 V, 5 V, and 1.8 V power to two card slots via serial control. It integrates overcurrent protection, thermal shutdown, UVLO, and break-before-make switching to ensure safe, standards-compliant operation in CableCARD™ and PCMCIA host systems. The TPS2228DB manages both VCC and VPP/VCORE rails per slot while maintaining electrical isolation between channels.
How does the TPS2228DB handle overcurrent events on individual outputs?
The TPS2228DB applies per-output current limiting: each xVCC and xVPP/VCORE output has its own threshold (e.g., 1 A for xVCC, 120–1250 mA for xVPP/VCORE depending on input source). During an overcurrent event, only the affected output is linearly current-limited; unaffected outputs remain operational. An open-drain OC pin asserts low to signal the fault, and if junction temperature reaches 120°C, the corresponding channel (A or B) is disabled - not the entire device.
Can the TPS2228DB support mixed-voltage card configurations, such as one 3.3 V card and one 5 V card simultaneously?
Yes. The TPS2228DB supports independent voltage assignment per slot: Slot A's xVCC can be set to 3.3 V while Slot B's xVCC is set to 5 V, and each slot's xVPP/VCORE can be independently configured to 1.8 V, 3.3 V, or 5 V. This capability is enabled by its dual-channel serial interface and separate AVCC/BVCC and AVPP/VCORE/BVPP/VCORE outputs, making it ideal for mixed-voltage CableCARD™ and PCMCIA environments.
What is the role of the 3.3VIN supply in the TPS2228DB, and why is it mandatory?
The 3.3VIN supply powers the TPS2228DB's internal logic, serial interface, and control circuitry - it is required for all operations including communication, switching, and protection functions. Even when delivering 5 V or 1.8 V to card slots, 3.3VIN must be present and within 3.0–3.6 V; absence or dropout triggers UVLO, forcing all switches into Hi-Z state. This ensures deterministic behavior during power sequencing and prevents undefined states.
Is the TPS2228DB pin-compatible with other devices in the TPS2228 family, such as the TPS2228PWP?
No. The TPS2228DB (30-pin SSOP) and TPS2228PWP (20-pin HTSSOP) have entirely different pin counts, layouts, and terminal assignments. While functionally identical in dual-serial operation, they are not pin-compatible - PCB redesign is required to substitute one for the other. The TPS2228DB's 30-pin DB package provides additional I/O isolation and thermal performance suited for high-density host designs, unlike the compact PWP variant.
TPS2228DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 30-SSOP (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- PCMCIA Switch
- Number of Outputs:
- 4
- Ratio - Input:Output:
- 3:4
- Output Configuration:
- High Side
- Output Type:
- -
- Interface:
- Serial
- Voltage - Load:
- 1.8V, 3.3V, 5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 1A
- Rds On (Typ):
- 97mOhm
- Input Type:
- -
- Features:
- 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:
- 30-SSOP
TPS2228DB FAQ
1.How can I place an order for TPS2228DB through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS2228DB 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 TPS2228DB reliable?
The price and inventory of TPS2228DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS2228DB is usually 5 days.
3.What payment methods are accepted for TPS2228DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS2228DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS2228DB?
TPS2228DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS2228DB 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 TPS2228DB?
For technical support, including TPS2228DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS2228DB requirements.
6.How does Aetrix verify that TPS2228DB is sourced from the original manufacturer or authorized distributors?
All TPS2228DB 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 TPS2228DB meets industry standards.
7.What is the process for return or replacement of TPS2228DB?
All TPS2228DB units undergo pre-shipment inspection (PSI). If there is an issue with TPS2228DB, 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 TPS2228DB part is unused and in its original packaging.
Return procedure for TPS2228DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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