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Texas Instruments TPS65253RHDR
- Part No.:
- TPS65253RHDR
- Manufacturer:
- Texas Instruments
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
TPS65253RHDR.pdf
- Description:
- IC REG BUCK ADJ DL 28VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,192
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Product details
Overview
TPS65253RHDR from Texas Instruments is a dual synchronous step-down DC/DC converter IC with integrated high-side and low-side MOSFETs, delivering 3.5-A continuous current on Buck 1 and 2.5-A on Buck 2 across a 4.5-V to 16-V input range. It features adjustable 300-kHz–1.2-MHz switching frequency via ROSC pin, 180° out-of-phase operation to reduce input ripple, and independent enable/soft-start/current-limit pins per channel - used in set-top boxes, DSL/cable modems, and automotive infotainment power rails.
For engineers reviewing the TPS65253RHDR datasheet, TPS65253RHDR pinout, TPS65253RHDR application, or TPS65253RHDR equivalent, key selection considerations include dual-buck sequencing control, external current limit resistor configuration (RLIM1/RLIM2), thermal shutdown at 160°C, PGOOD monitoring with 32-ms reset timer, and QFN-28 (5 mm × 5 mm) package thermal performance under 2.9-W dissipation at 25°C ambient.
Technical Context
The TPS65253RHDR implements peak current-mode control for both buck regulators, enabling stable loop compensation using simple RC networks on CMP1/CMP2 pins. Each channel supports independent soft-start (via SS1/SS2), enable sequencing (EN1/EN2), and adjustable cycle-by-cycle current limiting (RLIM1/RLIM2).
It integrates two internal LDOs (V3V = 3.3 V, V7V = ~6.5 V), operates in low-power pulse-skipping mode when LOW_P is asserted, and includes overvoltage transient protection (OVP) that disables the high-side FET if FB voltage exceeds 109% of 0.8 V reference - ensuring robust output regulation during load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 16 V - supports 5 V, 9 V, and 12 V system rails without external pre-regulation. |
| Buck 1 Continuous Current | 3.5 A - enables powering core logic or DDR memory rails with minimal external components. |
| Buck 2 Continuous Current | 2.5 A - suitable for I/O, USB, or audio subsystems requiring regulated 3.3 V or 1.8 V. |
| Switching Frequency Range | 300 kHz to 1.2 MHz - selectable via ROSC resistor; higher frequencies allow smaller magnetics and reduced EMI filtering area. |
| Feedback Reference Voltage | 0.8 V ±2% - sets output voltage via external resistor divider; enables precise 1.2 V, 1.8 V, 3.3 V, or 5 V generation. |
| Thermal Shutdown Threshold | 160°C trip / 140°C recovery - provides reliable overtemperature protection with 20°C hysteresis for sustained industrial operation. |
| Power Good Delay | 32 ms - ensures stable output before asserting open-drain PGOOD signal for system reset coordination. |
Pinout & Package
TPS65253RHDR is housed in a thermally enhanced 28-pin QFN package (RHD), 5 mm × 5 mm, with exposed PowerPAD for optimal PCB heat sinking. Pin pitch is 0.5 mm; RoHS-compliant, NIPDAU lead finish; MSL Level-3 (260°C, 168 hr).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ROSC (Pin 1) | Oscillator frequency setting input | Connects to ground via resistor (140 kΩ–600 kΩ) to set switching frequency between 300 kHz and 1.2 MHz. |
| FB1 (Pin 2), FB2 (Pin 19) | Output voltage feedback inputs | Each connects to resistor divider from respective buck output; sets regulated voltage with 0.8-V reference. |
| EN1 (Pin 6), EN2 (Pin 15) | Independent enable inputs | High-active logic; weak 1-MΩ pull-up to V3V; add capacitor for programmable startup delay (~1.7 ms/nF). |
| SS1 (Pin 4), SS2 (Pin 17) | Soft-start timing inputs | Internal 5-µA current source charges external capacitor; 4.7 nF yields ~0.8-ms soft-start time per channel. |
| RLIM1 (Pin 5), RLIM2 (Pin 16) | Peak current limit programming inputs | Resistor-to-ground sets current limit: Buck 1 up to 5 A, Buck 2 up to 4.25 A (typical at 25°C). |
| LX1 (Pins 9–10), LX2 (Pins 11–12) | Switching node outputs | Drive external inductors; require tight layout and low-inductance paths to minimize EMI and voltage spikes. |
| PGOOD (Pin 24) | Open-drain power-good output | Asserts high only when both buck outputs are ≥90% of target; deasserts if either falls ≤85% - used for system reset sequencing. |
| LOW_P (Pin 20) | Low-power mode control input | Active-high signal enables pulse-skipping mode to reduce quiescent current to 0.6 mA (vs. 40 mA normal). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual synchronous buck converters | Eliminates need for external high-side/low-side MOSFETs and gate drivers - reduces BOM count and layout complexity. |
| 180° out-of-phase operation | Cuts input ripple current by ~50%, allowing smaller input capacitors and lower EMI filter cost. |
| Adjustable current limit per channel | Enables optimization of inductor size and saturation margin - supports cost-effective 2.2-µH chokes at 500 kHz. |
| Independent soft-start and enable pins | Permits flexible power sequencing (e.g., core rail before I/O rail) without external timers or supervisors. |
| Integrated 3.3-V and 6.5-V LDOs | Provides always-on bias for microcontrollers or standby logic while main bucks are disabled - improves system-level standby efficiency. |
Applications
| DTV Set-Top Box Power | DSL/Cable Modem |
|---|---|
Use Scenario: Dual-rail power supply for SoC (1.2 V core), DDR memory (1.8 V), and interface circuitry (3.3 V) in consumer broadband equipment. IC Role / Device Role / Timing Role: Primary dual-buck PMIC managing all major DC rails with independent sequencing and PGOOD coordination. Use Value: Reduces component count by integrating two high-current buck stages and LDOs - lowers bill-of-materials cost and board area vs. discrete solutions. | Use Scenario: Power management for multi-port Ethernet + DSL PHY + voice codec in residential gateway devices. IC Role / Device Role / Timing Role: Centralized power controller delivering 3.3 V for PHY, 1.2 V for processor, and 5 V for analog front-end with hiccup-mode overload protection. Use Value: 180° phase shift minimizes input ripple, easing compliance with FCC Class B conducted emissions limits without oversized bulk capacitors. |
| Car DVD Player | Home Gateway Network |
Use Scenario: Powering display driver (5 V), video processor (1.2 V), and audio amplifier (3.3 V) in automotive infotainment head units. IC Role / Device Role / Timing Role: Automotive-grade dual-buck regulator supporting wide 4.5–16-V input range and thermal shutdown at 160°C for engine-bay environments. Use Value: Low-power mode (LOW_P active) cuts quiescent current to 0.6 mA - extends battery runtime during vehicle ignition-off states. | Use Scenario: Power solution for Wi-Fi 6 access points with dual-band RF, baseband SoC, and PoE-powered backhaul interfaces. IC Role / Device Role / Timing Role: High-efficiency dual-buck stage supplying 1.1 V CPU core and 3.3 V RF bias, synchronized to minimize noise coupling into sensitive RF sections. Use Value: Independent CMP1/CMP2 compensation pins allow tuning transient response for each rail - critical for maintaining RF stability during burst data transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65251RHDR | Same 28-pin QFN package; lower current ratings (3-A/2-A); fixed 500-kHz switching frequency; no LOW_P pin. | Suitable for cost-sensitive designs where full 3.5-A/2.5-A capability and low-power mode are not required. | Select TPS65251RHDR only if system load currents stay below 3 A (Buck 1) and 2 A (Buck 2), and pulse-skipping mode is unnecessary. |
| TPS65261RHBR | 24-pin QFN; higher current (4-A/3-A); supports 3-V to 5.5-V input; no integrated V7V/V3V LDOs; different pinout. | Targeted at low-voltage systems (e.g., USB-C PD sink) rather than wide-input industrial/commercial applications. | Choose TPS65261RHBR only for sub-5.5-V input designs needing higher current and willing to add external LDOs for bias rails. |
Compared with TPS65253RHDR, TPS65251RHDR trades current headroom and low-power flexibility for lower cost and simpler design, while TPS65261RHBR shifts focus to low-input-voltage, high-current use cases - neither offers identical wide-input, dual-LDO, and LOW_P functionality in the same footprint.
Availability
TPS65253RHDR is available at Aetrix Electronics and suitable for DTV set-top boxes, DSL/cable modems, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and production-ready thermal performance.
Supply support for TPS65253RHDR 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 technologies with over 50 years of innovation in high-reliability power conversion.
The TPS65253RHDR belongs to TI's integrated power management IC portfolio designed for space-constrained, multi-rail consumer and industrial systems requiring high efficiency, flexible sequencing, and robust protection features.
FAQ
What is the maximum continuous output current supported by each buck channel in the TPS65253RHDR?
The TPS65253RHDR supports 3.5-A continuous current on Buck 1 and 2.5-A continuous current on Buck 2 under typical thermal conditions (TA = 25°C, proper PCB layout). Peak current capability reaches 4 A and 3 A respectively, but sustained operation above continuous ratings requires careful thermal design and derating per the RHD package's θJA = 34°C/W specification.
How does the LOW_P pin affect the operating mode of the TPS65253RHDR?
When LOW_P is driven high, the TPS65253RHDR enters pulse-skipping mode, reducing quiescent current from 40 mA to 0.6 mA at no load - ideal for standby operation. This mode maintains regulation but increases output ripple; it is disabled automatically under loads >100 mA to ensure stable transient response. The TPS65253RHDR resumes fixed-frequency PWM when LOW_P is low.
Can the TPS65253RHDR be used with input voltages below 4.5 V?
No - the TPS65253RHDR has an absolute minimum input voltage of 4.5 V per its recommended operating conditions and UVLO threshold of 4.1 V (falling edge). Operation below 4.5 V risks improper startup, regulation loss, or undervoltage lockout activation. For sub-4.5-V applications, consider TI's TPS65261 or TPS65270 families instead of the TPS65253RHDR.
What is the purpose of the ROSC pin on the TPS65253RHDR, and how is it configured?
The ROSC pin on the TPS65253RHDR sets the internal switching frequency from 300 kHz to 1.2 MHz via an external resistor to ground. A 140-kΩ resistor yields ~1.2 MHz, while 600-kΩ gives ~300 kHz. The relationship follows fSW ≈ 174·ROSC⁻¹.¹²² (kHz, ROCS in kΩ). This allows designers to optimize efficiency, inductor size, and EMI performance without changing ICs.
Does the TPS65253RHDR provide overvoltage protection, and how does it function?
Yes - the TPS65253RHDR includes overvoltage transient protection (OVP). When the FB pin voltage exceeds 109% of the 0.8-V reference (i.e., >0.872 V), the high-side FET is immediately disabled to prevent output overshoot. Recovery occurs when FB drops below 107% (0.856 V), allowing the next switching cycle to resume. This protects downstream loads during fast load-release transients and is active on both buck channels independently.
TPS65253RHDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 3.5A, 2.5A
- Frequency - Switching:
- 300kHz ~ 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-VQFN (5x5)
TPS65253RHDR FAQ
1.How can I place an order for TPS65253RHDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65253RHDR 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 TPS65253RHDR reliable?
The price and inventory of TPS65253RHDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65253RHDR is usually 5 days.
3.What payment methods are accepted for TPS65253RHDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65253RHDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65253RHDR?
TPS65253RHDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65253RHDR 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 TPS65253RHDR?
For technical support, including TPS65253RHDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65253RHDR requirements.
6.How does Aetrix verify that TPS65253RHDR is sourced from the original manufacturer or authorized distributors?
All TPS65253RHDR 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 TPS65253RHDR meets industry standards.
7.What is the process for return or replacement of TPS65253RHDR?
All TPS65253RHDR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65253RHDR, 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 TPS65253RHDR part is unused and in its original packaging.
Return procedure for TPS65253RHDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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