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Texas Instruments TPS62311YZDT
- Part No.:
- TPS62311YZDT
- Manufacturer:
- Texas Instruments
- Package:
- 8-UFBGA, DSBGA
- Datasheet:
-
TPS62311YZDT.pdf
- Description:
- IC REG BUCK 1.5V 500MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,272
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Product details
Overview
TPS62311YZDT from Texas Instruments is a 500-mA, 3-MHz synchronous step-down DC-DC converter in an 8-pin NanoFree™ CSP package, delivering fixed 1.5-V output with ±0.5% to +1.3% DC voltage accuracy over –40°C to 85°C. It supports input voltage range 2.7 V to 6 V, achieves up to 93% efficiency at 3-MHz operation, and integrates power-save mode for light-load efficiency-designed for space-constrained mobile phones and smart-phone core logic rails.
For engineers reviewing the TPS62311YZDT datasheet, TPS62311YZDT pinout, TPS62311YZDT application, or TPS62311YZDT equivalent, key selection criteria include its 1.5-V fixed output, 2-V undervoltage lockout threshold, 86-µA quiescent current in PFM mode, 35-ns minimum on-time, and compatibility with 0.9-µH to 2.2-µH inductors and 4.7-µF ceramic output capacitors.
Technical Context
The TPS62311YZDT employs a voltage-mode PWM controller with input voltage feed-forward for fast transient response, enabling best-in-class load and line regulation (–0.001%/mA load regulation, 0.11%/V line regulation). Its dual MOSFET current limiting-P-channel (670–890 mA) and N-channel (550–890 mA sourcing)-ensures stable operation during start-up and low-duty-cycle conditions.
Operation switches automatically between fixed-frequency 3-MHz PWM (at moderate/heavy loads) and pulse-frequency modulation (PFM) power-save mode (at light loads), with seamless on-the-fly synchronization to external 3-MHz clocks via the MODE/SYNC pin. The integrated soft-start limits inrush current, and thermal shutdown activates at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.5 V ±0.5% to +1.3% DC accuracy over temperature-enables precise core supply for low-voltage DSPs and application processors. |
| Input voltage range | 2.7 V to 6 V-supports single-cell Li-ion (2.7–4.2 V) and 3-cell NiMH/NiCd (3.6–4.5 V) battery inputs without external regulators. |
| Switching frequency | 3 MHz (2.65–3.35 MHz typical)-permits use of sub-1-µH inductors and compact 4.7-µF ceramic output capacitors for ultra-thin designs. |
| Quiescent current | 86 µA in PFM mode-extends battery life in standby and idle states of portable devices. |
| UVLO threshold | 2.0 V to 2.2 V-prevents erratic operation during battery brownout while allowing deeper discharge than 2.4-V variants. |
| Output current | 500 mA continuous-sufficient for ARM Cortex-A/M cores, baseband processors, and memory I/O rails in smartphones. |
| Efficiency peak | Up to 93% at 3-MHz operation-minimizes thermal dissipation in sealed handheld enclosures. |
Pinout & Package
TPS62311YZDT uses an 8-pin NanoFree™ Chip Scale Package (CSP), measuring 1.5 mm × 1.5 mm with 0.5-mm pitch, optimized for minimal PCB footprint and thermal performance via bottom-side solder connections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Primary supply rail for power stage; must be decoupled with ≥4.7-µF X5R/X7R capacitor close to pin. |
| EN | Enable control | Active-high logic input; tie to VIN to enable, GND to shut down (<1 µA quiescent); must not float. |
| ADJ | Adjust reference input | Not connected on fixed-output TPS62311YZDT; leaving unconnected avoids misconfiguration. |
| FB | Feedback sense | Internally tied to regulated 1.5-V output; no external resistor divider required-simplifies layout and reduces BOM count. |
| VOUT | Output voltage sense | Direct connection to output node; provides feedback path for regulation loop and enables accurate remote sensing. |
| MODE/SYNC | Mode control & sync input | Pull to GND for auto PFM/PWM; pull to VIN for forced PWM; accept 3-MHz external clock for multi-rail synchronization. |
| PGND | Power ground | High-current return path for switch node; requires low-inductance connection to PCB ground plane. |
| SW | Switch node | Drain connection of internal P/N-MOSFETs; routes to external inductor; sensitive to layout parasitics affecting EMI and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| 3-MHz fixed-frequency operation | Enables use of 0.9–2.2 µH chip inductors and 4.7 µF ceramic capacitors-reducing solution size to <1 mm profile. |
| Power-save mode at light load | Maintains >85% efficiency down to 1 mA load via pulse-skipping-critical for always-on sensor and modem subsystems. |
| Integrated active power-down sequencing | Discharges output via internal 30–50 Ω discharge resistor (TPS6232x only)-not applicable to TPS62311YZDT; omitted. |
| 100% duty cycle capability | Supports lowest dropout operation (VO ≈ VI − 0.1 V) during battery sag-preserves system uptime near end-of-discharge. |
| Synchronizable on-the-fly | Accepts external 3-MHz clock on MODE/SYNC pin-enables noise-sensitive RF coexistence and multi-phase interleaving. |
Applications
| Smartphone Application Processor Core Rail | Bluetooth/WLAN Baseband Power |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores requiring tightly regulated 1.5-V supply with fast transient response during burst processing. IC Role / Device Role / Timing Role: Primary buck regulator delivering 500 mA with <250-µs startup time and ±1.5% output ripple under 400-mA load steps. Use Value: 3-MHz switching minimizes inductor size to 0.9 µH, enabling integration into <10-mm² PCB area alongside processor BGA. |
Use Scenario: Supplies 1.5-V rail to Bluetooth 5.0 and 802.11n WLAN transceivers with stringent EMI requirements. IC Role / Device Role / Timing Role: Synchronized buck converter operating in forced PWM mode to fix switching frequency at 3 MHz for predictable spectral filtering. Use Value: On-the-fly MODE/SYNC pin control allows dynamic switching between high-efficiency PFM (idle) and low-noise PWM (active transmit). |
| Digital Camera Image Sensor Bias | USB DSL Modem PHY Interface |
Use Scenario: Provides clean, low-noise 1.5-V bias to CMOS image sensor analog front-end during exposure capture. IC Role / Device Role / Timing Role: Fixed-output buck with 86-µA quiescent current and <10-mVpp PFM ripple-maintains SNR during low-power preview mode. Use Value: NanoFree CSP package (1.5 × 1.5 mm) fits within tight camera module height constraints (<0.6 mm profile). |
Use Scenario: Powers USB 2.0 PHY and ADSL line driver ICs requiring stable 1.5-V supply across wide input voltage swing (2.7–6 V). IC Role / Device Role / Timing Role: High PSRR buck regulator with 2-V UVLO-tolerates unregulated wall-adapter input while preventing brownout resets. Use Value: 93% peak efficiency reduces thermal load in sealed DSL modem enclosures, eliminating need for heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62313YZDT | Fixed 1.8-V output; identical 2-V UVLO, 3-MHz frequency, and CSP-8 package. | Targets 1.8-V I/O or memory rails instead of 1.5-V core logic; requires board-level voltage revalidation. | Select when system architecture mandates 1.8-V supply for interface peripherals rather than processor cores. |
| TPS62321DRCR | QFN-10 package (3 × 3 mm); fixed 1.5-V output; same electrical specs but higher RθJA (49°C/W vs 250°C/W). | Preferred for prototyping or thermal-limited designs where larger footprint is acceptable for easier rework and thermal relief. | Choose for development boards or industrial applications where QFN handling and thermal margin outweigh size constraints. |
Compared with TPS62311YZDT, TPS62313YZDT shifts output to 1.8 V for I/O compatibility but retains identical transient response and efficiency; TPS62321DRCR trades 85% smaller footprint for 5× higher thermal resistance, making it suitable for non-space-constrained thermal environments.
Availability
TPS62311YZDT is available at Aetrix Electronics and suitable for smartphone core rails, Bluetooth/WLAN baseband supplies, digital camera sensor bias, and USB DSL modem PHY interfaces requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for TPS62311YZDT 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 IC design.
The TPS623xx family was engineered specifically for ultra-compact, high-efficiency DC-DC conversion in battery-powered portable electronics-including smartphones, PDAs, and wireless modems-prioritizing minimal solution size and light-load efficiency.
FAQ
What is the output voltage tolerance of the TPS62311YZDT over temperature?
The TPS62311YZDT delivers a fixed 1.5-V output with DC voltage accuracy of –0.5% to +1.3% across the full operating temperature range of –40°C to 85°C. This specification is confirmed in the Electrical Characteristics table under "Fixed output voltage dc accuracy" for TPS62311, and applies directly to the TPS62311YZDT variant in CSP-8 packaging.
Does the TPS62311YZDT require external feedback resistors?
No, the TPS62311YZDT does not require external feedback resistors. As a fixed-output device, its FB pin is internally connected to the 1.5-V regulation node, and the ADJ pin is left unconnected per TI's terminal function guidance. Adding external resistors would disrupt regulation and is explicitly prohibited in the datasheet.
Can the TPS62311YZDT be synchronized to an external clock?
Yes, the TPS62311YZDT supports on-the-fly synchronization to an external 3-MHz clock signal applied to the MODE/SYNC pin. When driven by a compatible square wave (20–80% duty cycle), the internal P-channel MOSFET turn-on aligns to the falling edge of the external clock-enabling noise-controlled multi-rail systems without modifying the TPS62311YZDT's internal oscillator.
What is the minimum inductor value recommended for the TPS62311YZDT?
The TPS62311YZDT is validated with inductors ranging from 0.9 µH to 2.2 µH. The minimum recommended value is 0.9 µH, as confirmed in Figure 9–16 transient response plots and the "PARAMETER MEASUREMENT INFORMATION" section using L = 0.9 µH with CO = 10 µF. Using smaller inductors risks exceeding current limits and degrading stability.
Is the TPS62311YZDT pin-compatible with other TPS623xx CSP-8 variants?
Yes, all TPS623xx devices in the CSP-8 package-including TPS62311YZDT, TPS62313YZDT, and TPS62315YZDT-share identical pinout, footprint, and thermal pad configuration. This allows direct substitution within the same family for different output voltages (1.5 V, 1.8 V, 1.875 V) without PCB redesign, provided UVLO and load requirements are verified.
TPS62311YZDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
TPS62311YZDT FAQ
1.How can I place an order for TPS62311YZDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62311YZDT 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 TPS62311YZDT reliable?
The price and inventory of TPS62311YZDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62311YZDT is usually 5 days.
3.What payment methods are accepted for TPS62311YZDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62311YZDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62311YZDT?
TPS62311YZDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62311YZDT 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 TPS62311YZDT?
For technical support, including TPS62311YZDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62311YZDT requirements.
6.How does Aetrix verify that TPS62311YZDT is sourced from the original manufacturer or authorized distributors?
All TPS62311YZDT 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 TPS62311YZDT meets industry standards.
7.What is the process for return or replacement of TPS62311YZDT?
All TPS62311YZDT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62311YZDT, 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 TPS62311YZDT part is unused and in its original packaging.
Return procedure for TPS62311YZDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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