My Inquiry
My Account
Texas Instruments TPS56428RHLR
- Part No.:
- TPS56428RHLR
- Manufacturer:
- Texas Instruments
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
TPS56428RHLR.pdf
- Description:
- IC REG BUCK ADJ 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,612
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS56428RHLR from Texas Instruments is a 4-A synchronous step-down DC/DC converter with integrated high-side (68 mΩ) and low-side (37 mΩ) N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.6 V to 7.0 V. It employs D-CAP2™ adaptive on-time control at 650 kHz for fast transient response in digital TV power rails and networking terminal point-of-load regulation.
For engineers reviewing the TPS56428RHLR datasheet, TPS56428RHLR pinout, TPS56428RHLR application, or TPS56428RHLR equivalent, key selection considerations include its advanced Eco-mode™ light-load efficiency, 1% initial VFB accuracy, 1-ms fixed soft start with pre-bias support, cycle-by-cycle overcurrent protection, and power-good output with ±5% threshold hysteresis.
Technical Context
The TPS56428RHLR implements D-CAP2™ mode control-combining adaptive on-time PWM with internal compensation-to achieve stable operation with ceramic output capacitors and eliminate external loop compensation components. Its on-time is inversely proportional to VIN and proportional to VOUT, maintaining pseudo-constant 650 kHz switching across input and load conditions.
It integrates dual N-FETs optimized for low-duty-cycle operation, supports seamless transition between continuous conduction mode (CCM) and discontinuous conduction mode (DCM), and features proprietary output discharge via SW pin during shutdown while preventing negative output voltage. Thermal shutdown (165°C) and UVLO (3.75 V typical) provide robust system-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V - supports wide-input industrial and consumer power buses including 5 V, 12 V, and 15 V rails. |
| IOUT Max | 4 A continuous - delivers full rated current without derating at TA ≤ 85°C with proper PCB thermal design. |
| Switching Frequency | 650 kHz (pseudo-fixed) - enables compact magnetics and EMI filtering while balancing efficiency and size. |
| VFB Accuracy | ±1% initial tolerance - ensures precise output voltage setting across temperature and line/load conditions. |
| Shutdown Current | <10 μA - minimizes standby power loss in always-on systems such as STB and network controllers. |
| Soft Start Time | 1.0 ms (fixed) - controls inrush current and enables reliable sequencing with pre-biased outputs. |
| Power Good Threshold | ±5% of target VOUT - provides accurate enable/disable signaling for downstream logic and system reset coordination. |
Pinout & Package
TPS56428RHLR is housed in a 14-pin VQFN package (3.5 mm × 3.5 mm, 0.5 mm pitch) with an exposed thermal pad soldered to GND for enhanced thermal dissipation (RθJB = 21.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 14 | GND | Power ground return for switching circuit; all four pins must be shorted on PCB for low-impedance path and noise immunity. |
| 4, 5 | SW | Switch node connecting integrated high- and low-side FETs; requires low-inductance routing to minimize ringing and EMI. |
| 6 | VBST | Bootstrap supply for high-side gate driver; requires 0.1 µF ceramic capacitor to SW for reliable FET turn-on. |
| 7, 8 | VIN | Main input voltage supply (4.5–18 V); both pins must be paralleled to reduce impedance and improve current handling. |
| 9 | EN | Enable input (active-high, 1.6 V threshold); internal 350 kΩ pull-down allows default disable if left floating. |
| 10 | VFB | Feedback input for output voltage regulation; connects to resistor divider with ≤0.15 µA bias current error. |
| 11, 12 | VREG5 | 5.5 V regulated auxiliary supply (20 mA max); powers external circuitry and self-biases internal logic when EN is high. |
| 13 | PG | Open-drain power-good output; asserts high after 1.7× soft-start time when VOUT is within ±5% of target. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ Adaptive On-Time Control | Enables stable regulation with ceramic capacitors and zero external compensation components, reducing BOM count and layout complexity. |
| Advanced Eco-mode™ | Maintains >85% efficiency at 10 mA load (Vo=3.3 V), outperforming traditional skip-mode converters in light-load scenarios. |
| Integrated Dual N-FETs | 68 mΩ high-side + 37 mΩ low-side RDS(on) - eliminates external MOSFETs and gate drivers, simplifying design and improving thermal performance. |
| Pre-Biased Soft Start | Prevents output sinking during startup by ramping low-side gate drive duty cycle gradually, ensuring safe ramp-up from pre-charged rails. |
| Cycle-by-Cycle Overcurrent Protection | Detects valley current in low-side FET to trigger hiccup-mode shutdown at 5.6 A typical, protecting against sustained overload or short-circuit faults. |
Applications
| Digital Television Power Rail | Home Networking Terminal |
|---|---|
|
Use Scenario: Supplies 1.05 V core voltage to SoC in 4K UHD TV main board under dynamic video workload. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 4 A peak current with <100 µs transient response to CPU/GPU load steps. Use Value: D-CAP2™ control maintains <±1% output deviation during 3 A load transients, eliminating need for large bulk capacitance. |
Use Scenario: Powers Ethernet PHY and switch controller in residential gateway with variable traffic-induced load profiles. IC Role / Device Role / Timing Role: Secondary buck converter generating 3.3 V from 12 V bus, supporting burst-mode packet processing. Use Value: Advanced Eco-mode™ sustains 89% efficiency at 20 mA idle current, reducing standby power by 40% vs. standard PWM mode. |
| Digital Set-Top Box (STB) | Network Controller Board |
|
Use Scenario: Regulates 1.2 V FPGA I/O bank supply in cable/satellite STB with HDMI and tuner subsystems. IC Role / Device Role / Timing Role: High-accuracy voltage source with 1% VFB tolerance and PG signal for FPGA configuration sequencing. Use Value: Fixed 1-ms soft start prevents brownout during cold boot and coordinates with FPGA's power-on reset timing. |
Use Scenario: Provides 5.0 V auxiliary rail to management MCU and interface transceivers in industrial network controller. IC Role / Device Role / Timing Role: Dual-role converter: supplies 5 V via VREG5 pin and regulates main 5 V output using external feedback divider. Use Value: Integrated VREG5 eliminates need for separate LDO, reducing component count and PCB area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428RHLR | Same pinout and feature set but uses D-CAP3™ control with improved light-load efficiency and tighter VFB accuracy (±0.5%). | Preferred for new designs requiring higher precision or lower quiescent current (<5 μA shutdown). | Select TPS54428RHLR when upgrading for tighter regulation or lower standby power; not drop-in due to different internal compensation behavior. |
| MP2342DL-LF-Z | 4 A, 4.5–28 V input, 650 kHz fixed-frequency PWM; no Eco-mode, higher RDS(on) (85/55 mΩ), no VREG5 output. | Suitable where cost sensitivity outweighs light-load efficiency or auxiliary rail requirements. | Choose MP2342DL-LF-Z only if VREG5 and advanced Eco-mode are unnecessary and wider VIN range (up to 28 V) is required. |
Compared with TPS56428RHLR, TPS54428RHLR offers superior light-load efficiency and tighter VFB accuracy but requires revalidation of loop stability; MP2342DL-LF-Z trades Eco-mode and integrated VREG5 for broader input range and lower unit cost, necessitating external biasing and reduced efficiency below 100 mA.
Availability
TPS56428RHLR is available at Aetrix Electronics and suitable for digital TV power rails, home networking terminals, and digital set-top box applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS56428RHLR 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 ICs, with decades of expertise in high-efficiency DC/DC conversion and system-level power architecture.
The TPS56428RHLR belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for cost-sensitive, space-constrained consumer and networking applications demanding fast transient response and minimal external components.
FAQ
What is the maximum output current capability of the TPS56428RHLR?
The TPS56428RHLR delivers up to 4 A continuous output current under recommended operating conditions (TA ≤ 85°C, adequate PCB copper area, and proper thermal pad soldering). Its integrated 68 mΩ high-side and 37 mΩ low-side MOSFETs enable this rating without external FETs. Peak current limit is 5.6 A typical, with hiccup-mode protection engaging above sustained overload thresholds. Derating applies above 85°C ambient.
Does the TPS56428RHLR support pre-biased output startup?
Yes, the TPS56428RHLR includes dedicated pre-biased soft-start circuitry. When the output is already charged before EN assertion, the device avoids sinking current by gradually increasing low-side FET on-time cycle-by-cycle until reaching normal CCM operation. This prevents output voltage collapse and ensures smooth regulation entry, critical for systems with hold-up capacitors or shared power rails.
What is the purpose of the VREG5 pin on the TPS56428RHLR?
The VREG5 pin on the TPS56428RHLR provides a regulated 5.5 V (±0.3 V) auxiliary supply capable of sourcing up to 20 mA. It powers internal logic and can also supply external circuitry such as level shifters, bias networks, or monitoring ICs. VREG5 is only active when EN is high and requires a 0.47 µF ceramic capacitor to GND for stability. It is not intended as a primary power rail but reduces system BOM count.
How does the TPS56428RHLR achieve high light-load efficiency?
The TPS56428RHLR achieves high light-load efficiency through Advanced Eco-mode™-a proprietary auto-skip mechanism that transitions seamlessly from PWM to pulse-frequency modulation (PFM) as load decreases. Unlike basic skip mode, it maintains higher efficiency at sub-10 mA loads by optimizing gate drive timing and minimizing switching losses. Efficiency remains >85% at 10 mA (Vo=3.3 V), verified in Figure C009 of the datasheet.
Is the TPS56428RHLR pin-compatible with other TI buck converters?
The TPS56428RHLR shares the same 14-pin VQFN (RHL) package footprint with the TPS54428RHLR, enabling mechanical compatibility. However, electrical differences-including D-CAP2™ vs. D-CAP3™ control, VFB accuracy (±1% vs. ±0.5%), and shutdown current (<10 μA vs. <5 μA)-require full functional validation. It is not a drop-in replacement; schematic and layout review is mandatory before substitution.
TPS56428RHLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 14-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 4A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VQFN (3.5x3.5)
TPS56428RHLR FAQ
1.How can I place an order for TPS56428RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS56428RHLR 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 TPS56428RHLR reliable?
The price and inventory of TPS56428RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS56428RHLR is usually 5 days.
3.What payment methods are accepted for TPS56428RHLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS56428RHLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS56428RHLR?
TPS56428RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS56428RHLR 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 TPS56428RHLR?
For technical support, including TPS56428RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS56428RHLR requirements.
6.How does Aetrix verify that TPS56428RHLR is sourced from the original manufacturer or authorized distributors?
All TPS56428RHLR 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 TPS56428RHLR meets industry standards.
7.What is the process for return or replacement of TPS56428RHLR?
All TPS56428RHLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS56428RHLR, 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 TPS56428RHLR part is unused and in its original packaging.
Return procedure for TPS56428RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS56428RHLR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
