My Inquiry
My Account
Texas Instruments TPS56428RHLT
- Part No.:
- TPS56428RHLT
- Manufacturer:
- Texas Instruments
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
TPS56428RHLT.pdf
- Description:
- IC REG BUCK ADJ 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:447
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS56428RHLT 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, D-CAP2™ adaptive on-time control operating at 650 kHz, 0.6–7.0 V programmable output, and advanced Eco-mode™ for >90% efficiency at light loads - used in digital TV power rails and networking terminal point-of-load regulation.
For engineers reviewing the TPS56428RHLT datasheet, TPS56428RHLT pinout, TPS56428RHLT application, or TPS56428RHLT equivalent, key selection criteria include input voltage range (4.5–18 V), thermal performance in RHL package (RθJB = 21.4 °C/W), soft-start time (1.0 ms), power-good accuracy (±5%), and compatibility with ceramic output capacitors without external compensation.
Technical Context
The TPS56428RHLT implements D-CAP2™ control architecture: an adaptive on-time PWM scheme that eliminates external compensation while supporting ultra-low-ESR ceramic capacitors via internal ripple simulation. Its one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, maintaining pseudo-constant 650 kHz switching across input and load variations.
It integrates dual protection logic: cycle-by-cycle valley-current limiting (5.6 A typ.) with hiccup-mode UVP response (65% VFB threshold, 7 µs delay), and non-latching thermal shutdown at 165 °C. The device also features pre-biased soft-start, VREG5 LDO (5.5 V, 20 mA), and open-drain PG with ±5% trip hysteresis relative to target output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V - supports 5 V, 12 V, and 15 V intermediate bus architectures without derating. |
| IOUT Max | 4 A continuous - enables single-chip supply for SoC cores or FPGA I/O banks. |
| Switching Frequency | 650 kHz fixed typical - balances EMI, inductor size, and efficiency for compact PCB layouts. |
| Output Voltage Range | 0.6 V to 7.0 V - covers DDR termination, CPU cores, and peripheral I/O rails via resistor divider. |
| Reference Accuracy | ±1% initial - ensures tight output tolerance under nominal conditions without calibration. |
| Shutdown Current | <10 μA - meets ultra-low-power standby requirements in always-on consumer devices. |
| Soft-Start Time | 1.0 ms typical - prevents inrush current during power-up and enables controlled sequencing. |
| Thermal Resistance | RθJB = 21.4 °C/W - enables 4 A operation at 85°C ambient with minimal copper area in QFN package. |
Pinout & Package
TPS56428RHLT uses a 14-pin VQFN (RHL) package with 3.5 mm × 3.5 mm body and exposed thermal pad soldered to GND. Pin count, layout, and thermal pad connection are validated per TI SLVSBV4B datasheet Figure 3 (RHL top view) and Table "Pin Functions".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 14 | GND | Power ground return for SW node and internal FETs; all four pins must be shorted on PCB for low-impedance path. |
| 4, 5 | SW | Switch node between integrated high- and low-side FETs; connects directly to output inductor. |
| 6 | VBST | Bootstrap supply for high-side gate drive; requires 0.1 µF ceramic capacitor to SW. |
| 7, 8 | VIN | Main input supply (4.5–18 V); both pins must be paralleled for low-impedance routing. |
| 9 | EN | Enable input (1.6 V high threshold); internal 350 kΩ pull-down allows direct MCU GPIO control. |
| 10 | VFB | Feedback input for output voltage regulation; connects to resistor divider from VOUT. |
| 11, 12 | VREG5 | 5.5 V LDO output for biasing external circuitry; requires 0.47 µF ceramic capacitor to GND. |
| 13 | PG | Open-drain power-good signal; asserts high after 1.7× soft-start when VOUT is within ±5% of target. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables stable regulation with zero-ESR ceramic capacitors and no external compensation network. |
| Advanced Eco-mode™ | Maintains >85% efficiency at 10 mA load by entering discontinuous conduction mode with variable off-time. |
| Integrated 68 mΩ/37 mΩ FETs | Reduces BOM count and thermal footprint vs discrete solutions; supports 4 A continuous at 85°C ambient. |
| Pre-biased soft-start | Prevents reverse current flow into pre-charged output rail by ramping low-side gate drive duty cycle gradually. |
| Cycle-by-cycle overcurrent limit | Detects valley current on low-side FET; triggers hiccup mode if fault persists for 7 consecutive cycles. |
| VREG5 LDO output | Provides regulated 5.5 V (±3%) at up to 20 mA for biasing level shifters, supervisors, or optocouplers. |
Applications
| Digital TV Power Rail | Networking Home Terminal |
|---|---|
Use Scenario: Supplies 1.05 V core voltage to broadcast SoC in 4K UHD television platforms with 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 video processing bursts. Use Value: D-CAP2™ control achieves <1% output deviation during 0–4 A load steps without adding bulk capacitance. | Use Scenario: Powers Ethernet PHY and switch controller in residential gateway with 3.3 V and 1.2 V rails. IC Role / Device Role / Timing Role: Secondary buck converter generating 3.3 V from 12 V input, synchronized via EN pin sequencing. Use Value: 1.0 ms soft-start and PG output enable safe power-up order with upstream 5 V regulator. |
| Digital Set Top Box (STB) | Network Controller |
Use Scenario: Delivers 1.2 V to ARM-based media processor in low-cost STB with fanless thermal design. IC Role / Device Role / Timing Role: Main SoC supply with Eco-mode™ extending battery backup runtime during standby. Use Value: Shutdown current <10 µA and 87% efficiency at 10 mA reduce quiescent power by >40% vs PWM-only alternatives. | Use Scenario: Regulates 5.0 V for PoE-powered industrial network controller with 4.5–18 V wide-input requirement. IC Role / Device Role / Timing Role: Input-stage buck converter accepting unregulated 12 V or 15 V PoE-derived supply. Use Value: 18 V max VIN rating avoids need for front-end pre-regulator; RHL package supports 2-layer board layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3.5 A max output, 2 MHz fixed frequency, no integrated VREG5 LDO, requires external compensation. | Limited to lower-current applications; lacks pre-biased soft-start and PG output. | Choose for higher-frequency designs where smaller inductors are prioritized over light-load efficiency. |
| RT7297BZSP | 4 A output, 600 kHz, built-in soft-start and OCP, but no Eco-mode™ or VREG5 output. | Requires external bias supply; less suitable for systems needing sequenced power-good signaling. | Prefer when cost sensitivity outweighs need for integrated LDO and ultra-high light-load efficiency. |
Compared with MP2451DT-LF-Z and RT7297BZSP, the TPS56428RHLT delivers superior light-load efficiency via Eco-mode™, integrated VREG5 simplifies auxiliary biasing, and its D-CAP2™ architecture eliminates compensation design effort - making it optimal for space-constrained, multi-rail consumer electronics.
Availability
TPS56428RHLT is available at Aetrix Electronics and suitable for digital TV, networking home terminal, and digital set-top box applications requiring stable component supply, long-term production continuity, and automotive-grade reliability validation.
Supply support for TPS56428RHLT 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.
The TPS56428RHLT 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 TPS56428RHLT?
The TPS56428RHLT delivers 4 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB layout with thermal pad soldered). Its cycle-by-cycle overcurrent limit is specified at 5.6 A typical, enabling robust handling of short-duration load surges without shutdown. Derating applies above 85°C ambient, governed by RθJB = 21.4 °C/W and maximum junction temperature of 150°C.
Does the TPS56428RHLT require external compensation components?
No, the TPS56428RHLT does not require external compensation components. Its D-CAP2™ adaptive on-time control architecture embeds internal compensation, enabling stable operation with ceramic output capacitors down to zero ESR. This eliminates the need for external Type-II or Type-III compensation networks, reducing BOM count and design complexity.
How does the TPS56428RHLT handle pre-biased output conditions during startup?
The TPS56428RHLT implements pre-biased soft-start by initially applying narrow low-side gate pulses and incrementally increasing duty cycle cycle-by-cycle until reaching normal synchronous rectification. This prevents reverse current flow into a pre-charged output rail, ensuring smooth voltage ramp-up without sinking charge from downstream circuitry - critical for hot-swap and multi-rail sequencing applications.
What is the function of the VREG5 pin on the TPS56428RHLT?
The VREG5 pin on the TPS56428RHLT provides a regulated 5.5 V output (5.2–5.7 V range) capable of sourcing up to 20 mA. It is powered internally from VIN and remains active only when EN is high. This LDO output can bias external components such as level shifters, supervisors, or optocouplers, eliminating the need for a separate 5 V supply rail in many designs.
Can the TPS56428RHLT operate with ceramic output capacitors only?
Yes, the TPS56428RHLT is explicitly optimized for ceramic output capacitors. Its D-CAP2™ control loop includes internal ripple simulation circuitry that replaces the need for ESR-induced ripple required by traditional constant-on-time controllers. The datasheet confirms stable operation with 20–68 µF ceramic capacitors (e.g., TDK C3216X5R0J226M), achieving <1% output deviation during load transients.
TPS56428RHLT 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)
TPS56428RHLT FAQ
1.How can I place an order for TPS56428RHLT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS56428RHLT 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 TPS56428RHLT reliable?
The price and inventory of TPS56428RHLT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS56428RHLT is usually 5 days.
3.What payment methods are accepted for TPS56428RHLT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS56428RHLT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS56428RHLT?
TPS56428RHLT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS56428RHLT 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 TPS56428RHLT?
For technical support, including TPS56428RHLT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS56428RHLT requirements.
6.How does Aetrix verify that TPS56428RHLT is sourced from the original manufacturer or authorized distributors?
All TPS56428RHLT 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 TPS56428RHLT meets industry standards.
7.What is the process for return or replacement of TPS56428RHLT?
All TPS56428RHLT units undergo pre-shipment inspection (PSI). If there is an issue with TPS56428RHLT, 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 TPS56428RHLT part is unused and in its original packaging.
Return procedure for TPS56428RHLT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS56428RHLT 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…
