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Texas Instruments TPS62421DRCT
- Part No.:
- TPS62421DRCT
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TPS62421DRCT.pdf
- Description:
- IC REG BUCK PROG/1.8V DL 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:544
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Product details
Overview
TPS62421DRCT from Texas Instruments is a synchronous dual step-down DC–DC converter in a 10-pin VSON (3 mm × 3 mm) package, delivering fixed 1.8 V on Channel 2 and selectable 1.2 V or 1.8 V on Channel 1 via DEF_1 pin logic, with 600 mA and 1000 mA output capability respectively, operating from 2.5 V to 6 V input - ideal for OMAP™/DSP core and I/O rail supply in portable media players and smartphones.
For engineers reviewing the TPS62421DRCT datasheet, TPS62421DRCT pinout, TPS62421DRCT application, or TPS62421DRCT equivalent, key selection considerations include its 2.25-MHz fixed-frequency PWM operation, 180° out-of-phase switching for reduced input ripple, ±1% DC output voltage accuracy in PWM mode, and EasyScale™ one-wire interface support for dynamic voltage scaling during runtime.
Technical Context
The TPS62421DRCT integrates two independent synchronous buck converters sharing a 2.25-MHz oscillator with 180° phase offset to minimize input RMS current. Converter 1 supports fixed output selection (1.2 V / 1.8 V) via digital DEF_1 pin control, while Converter 2 defaults to fixed 1.8 V with ADJ2 tied directly to VOUT2.
It operates in automatic power-save mode (PFM at light loads, PWM at heavy loads) or forced-PWM mode via MODE/DATA pin, with typical 32-μA quiescent current for both channels in PFM and 1.2-μA shutdown current. Dynamic voltage positioning improves load transient response by regulating ±1% around nominal in PFM mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5 V to 6 V - supports single-cell Li-ion (3.0–4.2 V), 3-cell NiMH (3.6 V), or standard 3.3 V/5 V rails without external regulation. |
| Output Channels | Two independent outputs: CH1 = 600 mA max, CH2 = 1000 mA max - enables split-core/I/O rail architecture for low-power processors. |
| Default Output Voltages | CH1: 1.2 V (DEF_1 = Low) or 1.8 V (DEF_1 = High); CH2: fixed 1.8 V - eliminates external feedback resistors for common DSP/memory supply configurations. |
| Switching Frequency | 2.25 MHz (±12.5%) - allows use of small 2.2 μH inductors and 22 μF ceramic capacitors, reducing solution footprint vs lower-frequency alternatives. |
| DC Accuracy (PWM) | ±1% over temperature and line - ensures stable core voltage for OMAP™/ARM processors requiring tight VDD tolerance. |
| Quiescent Current | 32 μA (both converters, PFM mode, no load) - extends battery life in always-on subsystems like audio codecs or sensor hubs. |
| Shutdown Current | 1.2 μA - meets ultra-low standby requirements for mobile devices in deep-sleep states. |
Pinout & Package
TPS62421DRCT uses a leadless 10-pin VSON package (3.00 mm × 3.00 mm) with exposed PowerPAD™ thermal pad soldered to PCB ground for enhanced thermal performance (RθJB = 20.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ2 | Converter 2 feedback reference | Must be shorted to VOUT2 in fixed-output mode (TPS62421); not used for resistor programming - simplifies layout vs adjustable variants. |
| MODE/DATA | Multi-function control pin | Configures PFM/PWM mode (low/high) and serves as bidirectional EasyScale™ serial interface for real-time VOUT adjustment. |
| VIN | Main power input | Supplies both converters; accepts 2.5–6 V with integrated UVLO (rising threshold 2.4 V) to prevent brownout operation. |
| FB1 | Converter 1 feedback sense | Internally connected to fixed resistor divider - no external components needed; direct tie to VOUT1 required. |
| DEF_1 | CH1 output voltage selector | Digital input selecting between 1.2 V (low) or 1.8 V (high); determines which internal register sets CH1 output when using EasyScale™. |
| SW1, SW2 | Power switch nodes | Connect to external 2.2 μH inductors; require low-ESR ceramic output caps (22 μF typical) for stable 2.25-MHz operation. |
| EN1, EN2 | Independent enable inputs | Active-high controls startup timing per channel; enables staggered power sequencing for multi-rail SoCs. |
| GND | Power and signal reference | Shared ground for both converters; must be low-impedance connection to PowerPAD™ for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase switching | Reduces input capacitor RMS current by ~30%, enabling smaller 10-μF input ceramics instead of larger tantalum or polymer types. |
| Dynamic voltage positioning | Maintains +1% VOUT bias in PFM mode to absorb load-step undershoot, improving transient response without external compensation. |
| Integrated short-circuit protection | Uses dual current limits (P-MOS and N-MOS) to clamp output at ILIMF = 1.19–1.61 A, preventing thermal runaway during fault conditions. |
| 100% duty-cycle operation | Supports dropout as low as VOUT + 0.3 V (e.g., 2.1 V IN for 1.8 V OUT), extending usable battery range in Li-ion discharge profiles. |
| EasyScale™ one-wire interface | Enables host MCU to reprogram both outputs dynamically (e.g., lowering VDD during idle, raising for burst processing) using only MODE/DATA pin. |
Applications
| Smartphone Application Processor Core Supply | Portable Media Player I/O Rail |
|---|---|
Use Scenario: Powers ARM Cortex-A8/A9 cores in smartphones during active video decode or UI rendering, with rapid load transients from 10 mA to 600 mA. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing tightly regulated 1.2 V core and 1.8 V I/O rails with independent enable control for power-state sequencing. Use Value: ±1% PWM accuracy and dynamic voltage positioning ensure processor stability across P-states; 2.25-MHz switching minimizes EMI in RF-sensitive front-end layouts. | Use Scenario: Supplies NAND flash memory and SD card interfaces in portable media players, where I/O voltage must track core voltage scaling. IC Role / Device Role / Timing Role: Secondary buck channel (CH2) delivers 1.8 V at up to 1000 mA to high-speed data buses, synchronized 180° out-of-phase with core rail to reduce shared input ripple. Use Value: Fixed 1.8 V output eliminates feedback resistor placement errors; 100% duty cycle extends playback time near battery end-of-discharge (2.8 V VIN). |
| OMAP™ DSP System Power | Digital Camera Image Signal Processor (ISP) Supply |
Use Scenario: Powers TI OMAP™ L138/L137 DSPs in industrial handhelds, requiring simultaneous 1.2 V core and 1.8 V peripheral rails with low-noise operation. IC Role / Device Role / Timing Role: Synchronous dual buck with forced-PWM mode (via MODE/DATA = HIGH) provides fixed 2.25-MHz switching for predictable EMI filtering in mixed-signal PCBs. Use Value: 32-μA quiescent current in PFM mode preserves battery during idle sensing; thermal shutdown (150°C) protects against enclosure overheating in sealed enclosures. | Use Scenario: Supplies image signal processor and auto-focus motor drivers in compact digital cameras, where space constraints demand minimal external components. IC Role / Device Role / Timing Role: CH1 (1.2 V/600 mA) powers ISP core logic; CH2 (1.8 V/1000 mA) drives high-current analog front-end and motor drivers - both enabled synchronously via EN1/EN2. Use Value: VSON 3×3 mm package fits within 12 mm² board area; 1.2-μA shutdown current prevents battery drain during camera storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62420DRCT | Adjustable outputs (0.6–VIN) via external resistors on DEF_1 and ADJ2; lacks factory-programmed 1.2/1.8 V defaults. | Requires BOM additions (4 resistors + 1 capacitor) and layout space for feedback networks - less optimal for cost-sensitive, high-volume fixed-voltage designs. | Select TPS62420DRCT only if programmability across multiple VOUT configurations justifies added component count and calibration effort. |
| TPS62290DRCT | Single-channel, 600 mA, 2.25-MHz buck; no second output or DEF_1/EasyScale™ functionality - smaller 6-pin VSON package. | Suitable only for single-rail systems; cannot replace TPS62421DRCT's dual-rail capability without adding a second IC and increasing solution size/cost. | Choose TPS62290DRCT when only one regulated rail is needed and board space is extremely constrained - not a functional substitute for dual-output requirement. |
Compared with TPS62420DRCT, the TPS62421DRCT eliminates external feedback components for common 1.2 V/1.8 V configurations, reducing BOM count and layout complexity; versus TPS62290DRCT, it delivers essential dual-rail integration without compromising switching frequency or thermal performance in the same footprint.
Availability
TPS62421DRCT is available at Aetrix Electronics and suitable for smartphone application processor core supply, portable media player I/O rail, OMAP™ DSP system power, and digital camera ISP supply requiring stable component supply across production lifecycles.
Supply support for TPS62421DRCT 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for portable and industrial applications.
The TPS6242x product line was designed specifically for battery-powered portable electronics requiring compact, high-efficiency dual-rail DC–DC conversion with dynamic voltage scaling - targeting smartphones, PDAs, and media players from 2006 onward.
FAQ
What output voltages does the TPS62421DRCT provide by default?
The TPS62421DRCT provides two fixed output voltages: Channel 2 is factory-set to 1.8 V, while Channel 1 defaults to either 1.2 V (when DEF_1 pin is pulled low) or 1.8 V (when DEF_1 pin is pulled high). These values are internally trimmed and require no external resistors - unlike the adjustable TPS62420DRCT variant. The TPS62421DRCT datasheet confirms ±1% DC accuracy in PWM mode across –40°C to 85°C ambient.
Can the TPS62421DRCT operate from a 3.3-V input rail?
Yes, the TPS62421DRCT operates across an input range of 2.5 V to 6 V, making it fully compatible with standard 3.3-V system rails. At 3.3 V input, it delivers regulated 1.2 V or 1.8 V outputs with up to 600 mA (CH1) and 1000 mA (CH2) while maintaining >90% efficiency per the efficiency vs. load curves in the TPS62421DRCT datasheet. Its 2.25-MHz switching frequency ensures minimal external component size.
How does the MODE/DATA pin function on the TPS62421DRCT?
The MODE/DATA pin on the TPS62421DRCT serves two roles: (1) logic-level mode selection - pulled low for automatic PFM/PWM transition, pulled high for forced-PWM operation; and (2) bidirectional EasyScale™ serial interface for real-time output voltage reprogramming. When used as an interface, it requires open-drain drive with external pullup and supports acknowledge pulses (400–520 μs duration) per TPS62421DRCT specification.
What thermal performance can be expected from the TPS62421DRCT in a typical layout?
In a standard 2-layer PCB with 1-in² 1-oz copper thermal pad connected to the PowerPAD™, the TPS62421DRCT achieves RθJB = 20.4°C/W. At full 1000 mA load on CH2 with 3.6 V input and 1.8 V output, power dissipation is ~180 mW, resulting in ~3.7°C junction-to-board rise - well within the 125°C max operating junction temperature. The device enters thermal shutdown only above 150°C, with 20°C hysteresis.
Is the TPS62421DRCT pin-compatible with other devices in the TPS6242x family?
Yes, all TPS6242x variants including TPS62420DRCT and TPS62421DRCT share identical 10-pin VSON (DRC) packaging and pinout - confirmed in the "Pin Configuration and Functions" section of the TPS62421DRCT datasheet. However, functional differences exist: DEF_1 is digital-input on TPS62421DRCT but analog-input on TPS62420DRCT, and ADJ2 is unused (tied to VOUT2) on TPS62421DRCT but resistor-programmable on TPS62420DRCT.
TPS62421DRCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V, 1.8V (1.8V)
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA, 1A
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSON (3x3)
TPS62421DRCT FAQ
1.How can I place an order for TPS62421DRCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62421DRCT 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 TPS62421DRCT reliable?
The price and inventory of TPS62421DRCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62421DRCT is usually 5 days.
3.What payment methods are accepted for TPS62421DRCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62421DRCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62421DRCT?
TPS62421DRCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62421DRCT 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 TPS62421DRCT?
For technical support, including TPS62421DRCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62421DRCT requirements.
6.How does Aetrix verify that TPS62421DRCT is sourced from the original manufacturer or authorized distributors?
All TPS62421DRCT 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 TPS62421DRCT meets industry standards.
7.What is the process for return or replacement of TPS62421DRCT?
All TPS62421DRCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62421DRCT, 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 TPS62421DRCT part is unused and in its original packaging.
Return procedure for TPS62421DRCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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