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Texas Instruments TPS62311YZDR
- Part No.:
- TPS62311YZDR
- Manufacturer:
- Texas Instruments
- Package:
- 8-UFBGA, DSBGA
- Datasheet:
-
TPS62311YZDR.pdf
- Description:
- IC REG BUCK 1.5V 500MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,245
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Product details
Overview
TPS62311YZDR 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 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 features power-save mode for ultra-low quiescent current (86 µA) in light-load conditions - ideal for battery-powered mobile phones and smart-phones.
For engineers reviewing the TPS62311YZDR datasheet, TPS62311YZDR pinout, TPS62311YZDR application, or TPS62311YZDR equivalent, key selection criteria include its 1.5-V fixed output, 2-V undervoltage lockout threshold, 35-ns minimum on-time, integrated active power-down sequencing (TPS6232x only excluded), and compatibility with tiny 1-µH inductors and 4.7-µF ceramic capacitors in space-constrained portable designs.
Technical Context
The TPS62311YZDR employs a voltage-mode PWM controller with input voltage feed-forward for best-in-class load and line transient response. Its 3-MHz fixed-frequency operation enables use of miniature passive components while maintaining stability across wide input/output conditions.
It integrates dual MOSFETs (P-channel rDS(on) = 520–1000 mΩ at VGS = 2.8 V; N-channel rDS(on) = 400–1000 mΩ), programmable PFM/PWM mode via MODE/SYNC pin, and internal soft-start to limit inrush current - all optimized for single-cell Li-Ion or 3-cell NiMH/NiCd battery systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V - eliminates external feedback resistors and simplifies layout for stable low-voltage rail generation. |
| Input Voltage Range | 2.7 V to 6 V - supports direct connection to single-cell Li-Ion (2.7–4.2 V) and 3-cell NiMH/NiCd (3.6 V nominal) batteries. |
| Switching Frequency | 3 MHz (±0.35 MHz) - enables use of sub-1-mm-height 1-µH inductors and compact 4.7-µF X5R/X7R ceramic output capacitors. |
| Max Output Current | 500 mA - sufficient for powering core logic, RF transceivers, or memory subsystems in handheld devices. |
| Quiescent Current | 86 µA (PFM mode, no load) - extends battery life in standby/sleep states without sacrificing wake-up responsiveness. |
| UVLO Threshold | 2.0 V to 2.2 V - prevents erratic operation during deep battery discharge while allowing full utilization of cell capacity. |
| Efficiency Peak | Up to 93% at 3-MHz operation - minimizes thermal dissipation in sealed portable enclosures with limited airflow. |
Pinout & Package
TPS62311YZDR is packaged in an 8-pin NanoFree™ Chip Scale Package (CSP), measuring 1.5 mm × 1.5 mm with 0.5-mm pitch, featuring bottom-side solder balls for minimal PCB footprint and optimal thermal performance via direct die-to-PCB conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Main supply input for power stage; must be decoupled with low-ESR capacitor near package. |
| EN | Enable control | Active-high digital enable; pulled high to activate regulator, grounded to enter shutdown (<1 µA ISD). |
| MODE/SYNC | Mode selection & sync input | Ground = auto PFM/PWM; high = forced PWM; external 3-MHz clock input for multi-rail synchronization. |
| FB | Feedback sense | Internally connected to 1.5-V reference; not externally accessible on fixed-output variants like TPS62311YZDR. |
| VOUT | Regulated output | Primary power rail output; requires local 4.7-µF ceramic capacitor and low-impedance return path to PGND. |
| PGND | Power ground | High-current return path for switch node; must be solidly connected to thermal pad and input/output caps. |
| SW | Switch node | Drain connection of internal P/N-MOSFETs; connects directly to inductor; sensitive to layout parasitics. |
| AGND | Analog ground | Reference ground for control circuitry; tied to PGND via PowerPAD™ under package (not separate pin in CSP). |
Key Features
| Feature | Design Value |
|---|---|
| 3-MHz Fixed-Frequency Operation | Enables consistent EMI profile and predictable filter design using <1-mm-height inductors and small ceramics. |
| Power-Save Mode at Light Load | Reduces quiescent current to 86 µA while maintaining regulation - critical for always-on system rails. |
| 100% Duty Cycle Capability | Supports lowest dropout operation (VOUT = VIN − ~100 mV), extending usable battery range near end-of-discharge. |
| 35-ns Minimum On-Time | Allows stable 1.5-V output from 2.7-V input (55.6% duty cycle), enabling high step-down ratios with precision. |
| Synchronizable Switching | Accepts external 3-MHz clock on MODE/SYNC pin to eliminate beat frequencies in multi-converter systems. |
Applications
| Mobile Phone Core Rail | Smartphone Application Processor I/O |
|---|---|
Use Scenario: Powering ARM-based application processors requiring tightly regulated 1.5-V I/O supply in slim form factor. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering clean, low-noise 1.5-V rail with fast transient response to dynamic CPU load changes. Use Value: 93% peak efficiency and 35-ns min on-time ensure stable operation down to 2.7-V battery voltage while minimizing heat in thermally constrained chassis. |
Use Scenario: Supplying interface voltage for high-speed serial links (e.g., SDIO, USB PHY) in smartphone baseband modules. IC Role / Device Role / Timing Role: Low-ripple, fast-settling DC-DC converter supporting rapid voltage transitions during link training and sleep/wake cycles. Use Value: 3-MHz switching and integrated soft-start suppress inrush current during hot-plug events, preventing system brownouts. |
| WLAN/Bluetooth Coexistence Module | Digital Camera Image Sensor Bias |
Use Scenario: Providing isolated 1.5-V supply for dual-band WLAN/Bluetooth combo ICs sharing antenna resources. IC Role / Device Role / Timing Role: Noise-aware power source with MODE/SYNC pin controllable to force fixed-frequency PWM during RF transmission. Use Value: Forced PWM mode eliminates frequency modulation sidebands, reducing interference with adjacent 2.4-GHz ISM band receivers. |
Use Scenario: Biasing CMOS image sensor analog front-end requiring ultra-low noise and precise 1.5-V reference. IC Role / Device Role / Timing Role: High-PSRR, low-ripple DC-DC converter operating in PFM mode during idle frames to minimize standby power. Use Value: 86-µA quiescent current and <10-mVPP ripple (at 1 mA load) preserve sensor dark current stability and SNR performance. |
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 |
|---|---|---|---|
| TPS62313YZDR | Fixed 1.8-V output; identical 2-V UVLO, 3-MHz frequency, and CSP-8 package. | Targets 1.8-V I/O domains (e.g., DDR memory interfaces) rather than 1.5-V processor cores. | Select when system requires 1.8-V rail with same size, efficiency, and thermal profile as TPS62311YZDR. |
| 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). | Better thermal performance under high ambient or forced-air cooling; larger PCB footprint required. | Choose for industrial or extended-temperature designs where board area allows QFN and thermal margin is critical. |
Compared with TPS62313YZDR and TPS62321DRCR, the TPS62311YZDR offers the smallest footprint (1.5×1.5 mm CSP) and lowest thermal resistance to PCB for space- and weight-sensitive portable applications, while maintaining identical 1.5-V regulation accuracy and 3-MHz efficiency profile.
Availability
TPS62311YZDR is available at Aetrix Electronics and suitable for mobile phone core rails, smartphone application processor I/O supplies, WLAN/Bluetooth coexistence modules, and digital camera image sensor bias circuits requiring stable component supply with tight lead-time control and long-term lifecycle assurance.
Supply support for TPS62311YZDR 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 power management technologies, with decades of expertise in high-efficiency DC-DC conversion for portable electronics.
The TPS623xx family was designed specifically for battery-powered portable applications demanding ultra-small solution size, high efficiency across load range, and seamless integration with low-voltage DSPs and application processors - exemplified by the TPS62311YZDR's 1.5-V fixed output in NanoFree™ CSP.
FAQ
What is the output voltage tolerance of the TPS62311YZDR over temperature and load?
The TPS62311YZDR provides a fixed 1.5-V output with DC voltage accuracy of –0.5% to +1.3% over the full operating temperature range (–40°C to 85°C) and load current range (0–500 mA). This specification is confirmed in the Electrical Characteristics table under "Fixed output voltage dc accuracy" for TPS62311, with test conditions VI = 3.6 V and MODE/SYNC = VI.
Does the TPS62311YZDR support external synchronization, and what is the acceptable clock range?
Yes, the TPS62311YZDR supports external synchronization via the MODE/SYNC pin. It accepts an external clock signal in the range of 2.65 MHz to 3.35 MHz, with duty cycle between 20% and 80%. Synchronization forces fixed-frequency PWM operation and aligns the P-channel MOSFET turn-on edge to the falling edge of the external clock - enabling deterministic timing in multi-rail systems.
What is the minimum recommended inductor value for stable operation of the TPS62311YZDR?
The TPS62311YZDR is characterized and validated with a 1-µH inductor (e.g., FDK MIPW3226 series) and 4.7-µF ceramic output capacitor. While the datasheet does not specify a hard minimum, typical application circuits and efficiency curves confirm stable operation down to 0.9 µH. Using smaller inductors may increase peak current stress and reduce efficiency at light loads due to boundary conduction effects.
Can the TPS62311YZDR operate with input voltage below 2.7 V, and what happens at UVLO threshold?
No - the absolute minimum input voltage is 2.7 V per Recommended Operating Conditions. The device incorporates an undervoltage lockout (UVLO) with threshold between 2.00 V and 2.20 V. When VIN drops below this threshold, the TPS62311YZDR disables switching and enters shutdown, drawing less than 1 µA. It will not regulate or deliver output current below 2.7 V input.
Is the FB pin accessible or usable on the TPS62311YZDR for external feedback adjustment?
No - the FB pin is internally connected to the 0.4-V reference and is not externally accessible on fixed-output variants like the TPS62311YZDR. The datasheet explicitly states: "Do not connect the FB pin on the fixed output voltage version of TPS6231xYZD." External feedback is only supported on adjustable versions (e.g., TPS62300, TPS62320).
TPS62311YZDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
TPS62311YZDR FAQ
1.How can I place an order for TPS62311YZDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62311YZDR 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 TPS62311YZDR reliable?
The price and inventory of TPS62311YZDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62311YZDR is usually 5 days.
3.What payment methods are accepted for TPS62311YZDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62311YZDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62311YZDR?
TPS62311YZDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62311YZDR 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 TPS62311YZDR?
For technical support, including TPS62311YZDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62311YZDR requirements.
6.How does Aetrix verify that TPS62311YZDR is sourced from the original manufacturer or authorized distributors?
All TPS62311YZDR 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 TPS62311YZDR meets industry standards.
7.What is the process for return or replacement of TPS62311YZDR?
All TPS62311YZDR units undergo pre-shipment inspection (PSI). If there is an issue with TPS62311YZDR, 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 TPS62311YZDR part is unused and in its original packaging.
Return procedure for TPS62311YZDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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