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Nexperia USA Inc. RP510L181H-TR
- Part No.:
- RP510L181H-TR
- Manufacturer:
- Nexperia USA Inc.
- Package:
- -
- Datasheet:
-
RP510L181H-TR.pdf
- Description:
- IC REG 4A
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Inventory:6,000
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Product details
Overview
RP510L181H-TR from Ricoh Electronics is a synchronous step-down DC/DC converter optimized for SoC power delivery, operating from 2.5 V to 5.5 V input and delivering up to 4 A output current at 1.8 V fixed output voltage with ±1% accuracy (VSET ≥ 1.2 V), 2.3 MHz switching frequency, and foldback-type overcurrent protection. It targets high-density POL applications in FPGA, DSP, and networking equipment.
For engineers reviewing the RP510L181H-TR datasheet, RP510L181H-TR pinout, RP510L181H-TR application, or RP510L181H-TR equivalent, key selection criteria include its DFN3030-12 package thermal performance, adjustable soft-start via TSS pin, power-good signaling with NMOS open-drain PG pin, and foldback OCP recovery behavior under short-circuit conditions.
Technical Context
The RP510L181H-TR integrates Pch/Nch synchronous MOSFETs with typ. 0.04 Ω on-resistance, supports 100% maximum duty cycle for low-VIN operation, and employs peak-current-mode control with ramp compensation. Its feedback loop references a precise 0.6 V internal VFB with ±6 mV accuracy.
It implements UVLO (2.2 V typical release), thermal shutdown (165 °C trip), and foldback overcurrent protection that limits short-circuit output current to ILXLIM/4 ≈ 1.6 A while reducing switching frequency. The device features auto-discharge functionality to rapidly discharge VOUT during standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion, USB, and 3.3 V/5 V rail inputs without pre-regulation. |
| Output Voltage | Fixed 1.8 V - factory-trimmed for SoC core voltage compliance with ±1% accuracy at ≥1.2 V setpoint. |
| Max Output Current | 4 A - achievable under thermally optimized PCB layout with DFN3030-12 exposed thermal pad grounded. |
| Switching Frequency | Typ. 2.3 MHz - enables use of compact 1 µH inductors and low-ESR ceramic capacitors for high-density layouts. |
| OCP Type | Foldback - automatically recovers after fault removal; limits short-circuit current to ~1.6 A and reduces fSW to manage power dissipation. |
| Soft-Start | Adjustable (0.15 ms to 45 ms) - controlled by external capacitor on TSS pin to prevent inrush current and enable sequencing. |
| Power-Good Output | NMOS open-drain PG pin - signals valid regulation (VOUT within ±10% of VSET) with 0.05 ms release delay after fault clearance. |
| Standby Current | ≤0.01 µA - ultra-low quiescent draw in shutdown mode, critical for battery-backed systems. |
Pinout & Package
RP510L181H-TR uses the DFN3030-12 (3.0 × 3.0 × 0.8 mm) package with an exposed thermal pad requiring connection to PCB ground plane for thermal integrity. Pin 1–2 (PVIN) and Pin 3 (AVIN) are input voltage terminals with distinct filtering requirements; Pins 8–10 (AGND/PGND) must be tied to separate ground planes per design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 PVIN | Main input power supply | High-current VIN path; both pins must connect directly to input capacitor plane to minimize loop inductance. |
| 3 AVIN | Analog input filter node | Connected to PVIN via 1 Ω + 10 nF LPF; supplies clean bias to internal reference and error amplifier. |
| 4 PG | Power-good status indicator | NMOS open-drain output pulled low during UVLO, thermal shutdown, OVP/UVP, or latch/foldback events. |
| 5 CE | Chip enable control | Active-high logic input; <0.4 V = shutdown (0.01 µA IQ), >1.0 V = active; enables precise power sequencing. |
| 6 TSS | Soft-start timing control | Capacitor-connected node setting soft-start duration; open = 0.15 ms typ., 0.1 µF = 30 ms typ. |
| 7 VOUT/VFB | Output voltage / feedback sense | Fixed 1.8 V output; no external resistor divider required - simplifies layout and improves noise immunity. |
| 8 AGND | Analog ground reference | Reference for VFB, OSC, and error amplifier; must be isolated from high-current PGND paths. |
| 9, 10 PGND | Power ground return | High-current return for LX switch node and input/output capacitors; connects to thermal pad for heat sinking. |
| 11, 12 LX | Switch node | Drives external 1 µH inductor; requires tight layout with minimal trace length to reduce EMI and switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Actively discharges VOUT to 0 V during CE=low via internal NMOS, preventing backfeed and enabling safe hot-swap. |
| Synchronous rectification | Integrated Pch/Nch MOSFETs with 0.04 Ω combined on-resistance reduce conduction loss and eliminate external diode. |
| Thermal robustness | Junction temperature range −40°C to 125°C with thermal shutdown at 165°C and hysteresis release at 115°C. |
| Low-noise analog design | Dedicated AVIN pin with LPF and separate AGND/PGND routing minimize switching noise coupling into feedback path. |
| Sequencing support | Programmable soft-start and open-drain PG output allow cascaded startup of multiple rails without external controllers. |
Applications
| FPGA Core Power Supply | Networking ASIC Bias Rail |
|---|---|
|
Use Scenario: Powers 28 nm/16 nm FPGA core logic requiring stable 1.8 V at up to 3.5 A with tight transient response. IC Role / Device Role / Timing Role: Primary POL regulator delivering regulated 1.8 V from 3.3 V or 5 V intermediate bus; provides PG signal for FPGA configuration lock. Use Value: Foldback OCP prevents thermal runaway during partial short-circuits on dense BGA packages; 2.3 MHz fSW allows <1 mm² inductor area. |
Use Scenario: Supplies 1.8 V to multi-core networking ASICs in 1U switches with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck converter with auto-discharge ensuring clean reset between firmware updates. Use Value: 0.01 µA shutdown current extends backup battery life; DFN3030-12 footprint enables dual-rail placement adjacent to ASIC power pads. |
| Server Memory Interface Rail | Industrial DSP Processing Unit |
|
Use Scenario: Generates 1.8 V for DDR3/DDR4 memory termination and I/O buffers in edge-server modules. IC Role / Device Role / Timing Role: Secondary POL converter synchronized via CE pin to main CPU rail; soft-start timed to avoid simultaneous inrush. Use Value: Adjustable tSTART (via TSS cap) matches memory controller power-up sequence; ±1% VOUT accuracy maintains JEDEC timing margins. |
Use Scenario: Powers TI C6000 or Analog Devices SHARC DSP cores in ruggedized industrial controllers. IC Role / Device Role / Timing Role: Main SoC supply with thermal shutdown and UVLO protecting against 12 V DC-DC converter faults. Use Value: −40°C to 85°C operating range ensures reliability in uncooled enclosures; PG signal triggers watchdog reset on undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62903RQYR | 3.6 V to 16 V input, 1.8 V fixed, 3 A max, 2.5 MHz fSW, no auto-discharge | Requires higher VIN; lacks auto-discharge and foldback OCP - suited for non-battery systems with simpler protection needs | Select when input exceeds 5.5 V or when lower cost outweighs foldback recovery benefit |
| Analog Devices ADP5052ACPZ-R7 | 2.75 V to 5.5 V input, 1.8 V fixed, 4 A max, 1.2 MHz fSW, latch-type OCP only | Slower switching limits inductor size reduction; latch OCP requires CE reset or UVLO cycling to recover | Choose if board space permits larger 1.2 MHz magnetics and system can tolerate forced restart after overcurrent |
Compared with TPS62903RQYR and ADP5052ACPZ-R7, RP510L181H-TR uniquely combines sub-1 µA shutdown current, foldback OCP with automatic recovery, and auto-discharge in a 3×3 mm package - making it optimal for battery-sensitive, high-reliability POL designs where fault resilience and rapid sequencing matter.
Availability
RP510L181H-TR is available at Aetrix Electronics and suitable for FPGA core power, networking ASIC bias, server memory interface, and industrial DSP processing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for RP510L181H-TR 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
Ricoh Electronics is a Japanese semiconductor manufacturer specializing in high-efficiency power management ICs, including DC/DC converters, LDOs, and battery chargers for consumer, industrial, and automotive markets.
The RP510L series is designed specifically for high-current, low-voltage point-of-load conversion in space-constrained digital systems - emphasizing thermal efficiency, fast transient response, and robust fault handling without external complexity.
FAQ
What is the recommended external inductor value for RP510L181H-TR?
The datasheet specifies 1.0 µH as the optimal inductance for stability and transient performance. Inductors must have low DC resistance (<20 mΩ), saturation current ≥5.5 A, and be placed adjacent to the IC with minimal trace length. Recommended parts include TDK CLF7045NIT-1R0N-D or SPM4012T-1R0M-LR.
How does the foldback overcurrent protection behave during sustained short-circuit?
Under sustained short-circuit, foldback OCP reduces peak inductor current to ILXLIM/2 ≈ 3.25 A and lowers switching frequency, limiting output current to ~1.6 A. Recovery occurs automatically once load current drops below this threshold or upon CE pin toggle/UVLO reset - no manual intervention needed.
Can RP510L181H-TR operate with only one input capacitor?
No. The design requires ≥22 µF ceramic input capacitance distributed across PVIN–PGND, with AVIN filtered separately via 1 Ω + 10 nF LPF. Using a single capacitor violates layout guidelines, risks instability, and compromises UVLO and soft-start timing accuracy due to inadequate high-frequency decoupling.
Is the PG pin compatible with 1.8 V logic systems?
Yes. The PG pin is an NMOS open-drain output with 45 Ω typical on-resistance. When pulled up to 1.8 V via a 10–100 kΩ resistor, it delivers a clean low-level signal (<0.4 V) during faults and high-impedance state otherwise - fully interoperable with 1.8 V GPIO interfaces without level shifting.
RP510L181H-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RP510L181H-TR FAQ
1.How can I place an order for RP510L181H-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for RP510L181H-TR 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 RP510L181H-TR reliable?
The price and inventory of RP510L181H-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP510L181H-TR is usually 5 days.
3.What payment methods are accepted for RP510L181H-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP510L181H-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RP510L181H-TR?
RP510L181H-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RP510L181H-TR 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 RP510L181H-TR?
For technical support, including RP510L181H-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP510L181H-TR requirements.
6.How does Aetrix verify that RP510L181H-TR is sourced from the original manufacturer or authorized distributors?
All RP510L181H-TR 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 RP510L181H-TR meets industry standards.
7.What is the process for return or replacement of RP510L181H-TR?
All RP510L181H-TR units undergo pre-shipment inspection (PSI). If there is an issue with RP510L181H-TR, 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 RP510L181H-TR part is unused and in its original packaging.
Return procedure for RP510L181H-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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