TPS53511RGTR - 1.5A Sync Buck Regulator 4.5-18V | TI
MPN: TPS53511RGTR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.75 | $0.75 |
| 10 | $0.68 | $6.80 |
| 100 | $0.58 | $58.00 |
| 500 | $0.48 | $240.00 |
| 1,000 | $0.42 | $420.00 |
TPS53511RGTR Overview
A synchronous buck converter is a DC-DC switching regulator that steps a higher input voltage down to a lower output voltage using two internal MOSFETs (high-side and low-side) alternating between input and ground. Compared with a linear regulator, a buck converter achieves high efficiency through switched-mode power conversion, and it sits within the broader hierarchy of power management ICs (PMICs), under voltage regulators and DC-DC converters. Synchronous rectification replaces the external freewheeling diode with a low-side MOSFET, reducing conduction losses.
Key features of the TPS53511 include the D-CAP2 control topology, which provides fast transient response with no external compensation components, making the design cost-effective with a low external component count; integrated MOSFETs that eliminate the need for external power switches; and low standby current suited to always-on points-of-load. The adaptive on-time (AOT) architecture dynamically adjusts the switching pulse width against input and output conditions to maintain regulation across load ranges.
Technically, D-CAP2 mode combines an internal ripple-generation network with an adaptive on-time scheme, enabling stable operation with small ceramic output capacitors and supporting a wide duty-cycle range for computing power systems. The exposed-pad VQFN-16 (RGT) package provides low thermal impedance to the PCB, and the 4.5 V to 18 V input range covers 5 V, 12 V intermediate bus rails and most AC-DC adapter outputs.
Typical applications include points-of-load (POL) regulation in computing power systems, network and communication equipment, consumer electronics, and industrial subsystems requiring a compact, low-component-count 1.5 A buck stage. Cost sensitivity and fast load transients make it a strong fit for memory, SoC core and I/O rails.
For design, choose an output capacitor with low ESR to support the D-CAP2 ripple-injection scheme, and verify minimum on-time limits when converting 18 V down to very low outputs. Keep the SW, BOOT and VIN loops tight on the PCB layout.
This page synthesizes distributor pricing (as of 2026-09-10), pin-compatible drop-in alternatives including the pin-for-pin TPS54326, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for TPS53511RGTR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS53511RGTR (same form factor and footprint) β differing in Package, Topology, Control Mode, Input Voltage Range, Maximum Output Current.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS54326
β Drop-Inπ Reference alternative (not in catalog)
TPS53515RVER
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$3.18 / Unit
View Datasheet βTPS53513RVER
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$3.55 / Unit
View Datasheet βTPS53316RGTR
β Drop-Inπ Reference alternative (not in catalog)
TPS54226RGTT
β Drop-Inπ Reference alternative (not in catalog)
MIC2126YML-T5
β Drop-Inπ Reference alternative (not in catalog)
TPS53511RGTR Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Step-Down (Buck) Converter, D-CAP2 mode |
| Input Voltage Range | 4.5 V to 18 V |
| Output Current | 1.5 A |
| Output Type | Positive Adjustable |
| Feedback Reference Voltage | 0.76 V |
| Number of Outputs | 1 |
| Switching MOSFETs | Integrated (synchronous) |
| Control Mode | Adaptive On-Time D-CAP2 |
| Operating Temperature | -40C to +85C |
| Package | 16-VFQFN Exposed Pad (RGT), VQFN-16 |
| Mounting Type | Surface Mount |
| Quiescent / Standby Current | Low standby current (per datasheet) |
| Applications | Points-of-load, computing power systems |
| Package Size | 4x4 mm QFN family |
| Packaging | Tape & Reel (RGTR suffix) |
TPS53511RGTR 4x4 mm qfn family Pin Configuration Guide
Pin configuration for TPS53511RGTR (4x4 mm qfn family package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for TPS53511RGTR.
Refer to the datasheet for full pin configuration.
Typical Applications
TPS53511RGTR is suitable for 6 applications: Point-of-Load Regulation in Computing Systems, Networking and Communication Equipment, Consumer Electronics Power Supplies, Industrial Subsystems and Factory Automation, Memory and SoC Core Voltage Rails, Power Tree Second-Stage Post-Buck Regulation.
Point-of-Load Regulation in Computing Systems
The TPS53511 is explicitly designed by TI for points-of-load (POL) in computing power systems. Its 4.5 V to 18 V input range connects directly to 12 V intermediate bus rails, while the 1.5 A output covers DDR termination-adjacent rails, SoC I/O supplies and low-power core domains. The D-CAP2 adaptive on-time control provides fast transient response with no external compensation components, which is essential when microsecond load steps would otherwise cause voltage excursions outside the tolerance window of processor rails. Integrated MOSFETs shrink the solution footprint at each POL site, and low standby current suits servers and desktops that must meet energy-efficiency targets. Place the converter close to the load with compact input decoupling for best transient performance.
Recommended
Networking and Communication Equipment
Switches, routers and optical modules distribute a 12 V backplane rail that must be stepped down efficiently at many circuit blocks. The TPS53511's 18 V maximum input covers these rails directly, and its synchronous integrated-MOSFET topology delivers high conversion efficiency at 1.5 A without external power switches, reducing both BOM cost and board area in dense line-card designs. The D-CAP2 loop responds quickly to traffic-dependent load transients, holding tightly regulated 0.76 V-referenced outputs for PHY, MAC and memory supplies. Its VQFN-16 exposed-pad package conducts heat into the PCB ground plane, supporting convection-cooled enclosures. Low component count also simplifies qualification across multiple product variants sharing a common power tree.
Recommended
Consumer Electronics Power Supplies
Set-top boxes, smart displays, audio accessories and appliances derive low-voltage digital rails from 12 V or adapter inputs. The TPS53511 fits this space because it offers a cost-effective, low-component-count solution: no external compensation, no external MOSFETs, and compatibility with small ceramic output capacitors thanks to the D-CAP2 internal ripple network. The adjustable output referenced to 0.76 V covers common 1.0 V, 1.2 V, 1.5 V, 1.8 V and 3.3 V rails with a simple resistor divider. Its VQFN-16 package suits automated SMT assembly at consumer volumes, and tier pricing near $0.42 at 1000 pieces (as of 2026-09-10) supports aggressive BOM targets across high-volume product lines.
Recommended
Industrial Subsystems and Factory Automation
Industrial controllers, sensors and I/O modules commonly regulate a 24 V-derived or 12 V distribution rail down to localized 1.8 V to 3.3 V digital supplies. The TPS53511's 4.5 V to 18 V input range handles 12 V buses directly and, with appropriate upstream preregulation, fits wider industrial chains. Its -40C to +85C operating range matches factory floor enclosures, and the D-CAP2 topology tolerates the fast load steps typical of microcontrollers waking from sleep to transmit on fieldbuses. Integrated MOSFETs reduce component count on densely populated I/O boards, improving reliability by minimizing solder joints. Compact VQFN-16 footprint allows power stages to sit near each processor cluster rather than centralized, reducing distribution losses.
Recommended
Memory and SoC Core Voltage Rails
DDR memory and low-power SoC cores require sub-1.8 V rails regulated within a few percent despite rapid load transitions between idle and burst states. The TPS53511's adjustable output down to the 0.76 V reference and its D-CAP2 fast transient response align directly with these requirements: no external compensation network is needed, and the adaptive on-time reacts within microseconds to current steps. The 1.5 A capacity comfortably serves single-rank DDR rails or small SoC cores, while pin-compatible 3 A family members (TPS54326, TPS54226) provide an upgrade path for dual-rank or multi-core configurations without PCB respin. Output voltage accuracy and ripple are maintained with compact ceramic output capacitance per the TI datasheet guidance.
Recommended
Power Tree Second-Stage Post-Buck Regulation
In multi-rail systems, a first-stage converter (often 12 V to 5 V or 3.3 V) feeds local second-stage POL converters. The TPS53511 serves as this efficient second stage: its 4.5 V minimum input accepts 5 V rails directly, while 18 V tolerance allows use directly on 12 V distribution. Compared with LDO post-regulation, the synchronous buck topology at 1.5 A dissipates far less heat - at a 1 V output from a 5 V rail, an LDO would waste roughly 6 W at full load whereas a switching converter wastes a fraction of that, easing thermal design in sealed enclosures. The exposed-pad VQFN-16 package plus low standby current makes it efficient even in always-on standby domains, supporting system-level idle power targets.
Recommended
Recommended Products Summary
Engineering reference data for TPS53511RGTR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS54326 | TPS53515RVER | TPS53316RGTR | MIC2126YML-T5 |
|---|---|---|---|---|---|
| Package | 16-VQFN (RGT) Exposed Pad | 4x4 mm QFN - pin-for-pin compatible | VQFN-16 (RVE suffix) | VQFN-16 (RGT) | VQFN-16 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Control Topology | D-CAP2 adaptive on-time | Eco-mode D-CAP family | D-CAP2 | D-CAP family | Controller-type buck control |
| Integrated MOSFETs | Yes (synchronous) | Yes (synchronous) | Yes (synchronous) | Yes (synchronous) | Controller - external MOSFETs required |
| Interchangeability per TI | Baseline 1.5 A part | Pin-for-pin, interchangeable with TPS53511 | Same family - verify footprint suffix | Compare per Avaq - verify pinout | Cross-brand - full validation required |
Key Differentiators
- Lowest-cost 1.5 A point in the TI D-CAP2 POL family (vs TPS54326)
- No external compensation required (vs MIC2126YML-T5)
- Interchangeability with a 3-A drop-in upgrade (vs TPS54226RGTT)
- Trade-off: 1.5 A ceiling limits heavy rails (vs TPS53515RVER)
Design Notes
Keep the switching loop as small as possible: place the input ceramic capacitor (typically 10 uF class, per datasheet) directly across VIN and PGND, route SW to the inductor with a short wide trace, and return the low-side source to a solid ground plane through the exposed pad. The exposed pad of the VQFN-16 (RGT) package is the main thermal and electrical ground path - use a 4x4 via array under the pad tied to the ground plane. Per TI's product description, the D-CAP2 loop requires no external compensation, so layout parasitics become the dominant stability factor.
D-CAP2 regulation depends on the internal ripple-injection network interacting with the output capacitor impedance. Using output capacitors with ESR far outside the datasheet-recommended range can cause pulse skipping, jitter or reduced transient performance. Also note that adaptive on-time means switching frequency varies with VIN and VOUT - designers who expect a fixed frequency may misread this as instability. Verify minimum on-time limits when stepping 18 V down to the 0.76 V reference minimum; very low duty cycles constrain the achievable conversion ratio.
Estimated: at 12 V input, 1.2 V output and full 1.5 A load, output power is 1.8 W; at roughly 90% typical synchronous-buck efficiency, dissipation is approximately 0.2 W, which a good exposed-pad layout handles without a heatsink. At low output voltages from a high input (e.g. 18 V to 0.76 V at 1.5 A), duty cycle and RMS currents rise - recalculate losses and confirm junction temperature stays within the -40C to +85C operating range with your board copper area.
For multi-rail computing designs, use the EN pin to sequence the TPS53511 after the primary 12 V or 5 V rail is established. An upgrade path exists within the same footprint class: TI states the 3-A TPS54326 is pin-for-pin and interchangeable with the TPS53511, so a BOM swap covers load growth without PCB respin. Verify the QFN suffix (RGTR vs RVE/RGTT variants) against your land pattern whenever substituting family members.
Compliance Information
Compliance data was not present in the verified web data for this part; consult the TI product page or request a certificate of conformance from the distributor.
