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Texas Instruments TPS65252RHDT
- Part No.:
- TPS65252RHDT
- Manufacturer:
- Texas Instruments
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
TPS65252RHDT.pdf
- Description:
- IC REG BUCK ADJ 3A/2A DL 28VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,786
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Product details
Overview
TPS65252RHDT from Texas Instruments is a dual-channel synchronous step-down power management IC integrating two high-current buck converters (3.5-A/2.5-A peak, 3-A/2-A continuous), one adjustable USB switch (up to 1.1 A), and supervisory circuitry including PGOOD and reset generation. It operates from 4.5 V to 16 V input, delivers output voltages from 0.8 V to VIN − 1 V, and supports 300 kHz–2.2 MHz switching via ROSC resistor - used in set-top boxes, home gateways, and car DVD players for compact, high-efficiency DC/DC conversion.
For engineers reviewing the TPS65252RHDT datasheet, TPS65252RHDT pinout, TPS65252RHDT application, or TPS65252RHDT equivalent, this page provides verified technical context on dual-buck sequencing, USB current-limit configuration, out-of-phase operation for input ripple reduction, low-power mode activation, and integrated LDO bias rails (V3V/V7V) - all critical for embedded power system design and BOM optimization.
Technical Context
The TPS65252RHDT implements peak current-mode control with 180° phase shift between Buck1 and Buck2 to minimize input capacitor RMS current and EMI. Each converter features independent ENx, SSx, FBx, COMPx, BSTx, LXx, RLIMx, and VINx terminals enabling programmable start-up sequencing, soft-start timing (5 µA internal current source), and adjustable cycle-by-cycle current limiting (75–300 kΩ RLIM range).
It integrates two internal LDOs (V3V at 3.3 V/10 mA, V7V at 6.25 V/10 mA), a 1-A USB switch with overcurrent protection (rUSB-adjustable trip points: 0.55 A or 1.10 A), and a supervisor with 256-ms PGOOD assertion timer, 85%/90% UV/OV thresholds, and hiccup-mode fault recovery. Low-power mode (LOW_P pin) enables pulse-skipping operation to reduce quiescent current to 0.5 mA.
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 systems without external pre-regulation. |
| Buck1 Peak Current Limit | 1.1 A to 5.2 A - set by 75–300 kΩ resistor on RLIM1, enabling inductor size optimization. |
| Buck2 Peak Current Limit | 0.9 A to 4.5 A - set by 75–300 kΩ resistor on RLIM2, supporting asymmetric load requirements. |
| Switching Frequency Range | 300 kHz to 2.2 MHz - selected via ROSC resistor (50–600 kΩ), balancing efficiency, size, and EMI. |
| USB Switch Current Limit | 0.55 A or 1.10 A - configured by rUSB resistor (154 kΩ or 76.8 kΩ to GND), meeting USB 2.0 port compliance. |
| PGOOD Assertion Delay | 256 ms - fixed timer ensures stable output before system release, eliminating need for external reset IC. |
| Quiescent Current (Low-P Mode) | 0.5 mA - reduces standby power in host-processor sleep states without disabling regulation. |
| V3V / V7V Output Accuracy | ±1% (V3V = 3.3 V, V7V = 6.25 V) - powers MCU cores, analog circuits, and gate drivers with tight tolerance. |
Pinout & Package
TPS65252RHDT is housed in a thermally enhanced 28-pin QFN package (5 mm × 5 mm, RHD suffix), with exposed thermal pad connected to GND. Pin functions are validated per TI SLVSAM1C datasheet Rev. December 2012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2 | Feedback input | Connects to resistor divider to set output voltage at 0.8 V reference; ±2% accuracy over full operating range. |
| SS1, SS2 | Soft-start control | 5 µA internal current source charges external capacitor; 1 nF ≈ 167 µs ramp time - enables controlled voltage rise. |
| EN1, EN2 | Enable logic input | Active-high (VIH = 1.55 V min); weak 1-MΩ pull-up allows delayed start via capacitor-to-GND on ENx. |
| RLIM1, RLIM2 | Current limit setting | Resistor-to-GND sets peak inductor current; 75–300 kΩ yields 1.1–5.2 A (Buck1) or 0.9–4.5 A (Buck2). |
| ROSC | Oscillator frequency control | Resistor-to-GND selects switching frequency from 300 kHz to 2.2 MHz - critical for EMI filtering and inductor selection. |
| USB_EN, rUSB, USB_nILIM | USB switch interface | Logic-enable input, current-limit programming, and open-drain fault flag - enables safe hot-plug USB peripheral support. |
| PGOOD | Power-good status | Open-drain output asserted high only when both buck outputs exceed 90% of nominal - used for system enable sequencing. |
| V3V, V7V | Internal LDO outputs | Stable 3.3 V / 6.25 V bias rails; V3V supplies digital logic, V7V drives gate drivers and bootstrap circuits. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase buck operation | Reduces input ripple current by ~70%, allowing smaller input capacitors and lower EMI filter cost. |
| Adjustable USB current limit | Two factory-trimmed thresholds (0.55 A / 1.10 A) via single rUSB resistor - eliminates need for discrete current-sense IC. |
| Integrated V3V and V7V LDOs | Provides dedicated bias rails for internal circuitry and external logic without requiring auxiliary regulators. |
| Thermal shutdown with hysteresis | 160°C trip point with 20°C hysteresis ensures safe recovery after overload without oscillation or latch-up. |
| Hiccup-mode overcurrent protection | Global 12-ms shutdown + restart cycle on sustained overload - protects MOSFETs while maintaining system visibility. |
| Low-power pulse-skipping mode | Reduces quiescent current from 10 mA to 0.5 mA during light/no-load conditions - extends battery life in portable systems. |
Applications
| Set-Top Box Power Supply | Home Gateway Router |
|---|---|
Use Scenario: Dual-rail power delivery for SoC core (1.2 V), I/O (1.8 V), USB peripherals (5 V), and RF front-end (3.3 V). IC Role / Device Role / Timing Role: Primary PMIC managing buck sequencing, USB port power control, and PGOOD coordination with SoC reset. Use Value: Eliminates four discrete regulators and one USB switch IC; reduces board area by >35% and simplifies layout with shared input capacitance. |
Use Scenario: Powering Wi-Fi chipset, Ethernet PHY, memory, and USB host controller in compact residential gateway. IC Role / Device Role / Timing Role: Centralized power manager delivering regulated rails with precise startup order and fault reporting via PGOOD. Use Value: Enables single-stage 12 V input conversion with <85 mV output ripple (1.2 V @ 3 A), meeting IEEE 802.3af PoE+ auxiliary supply specs. |
| Car DVD Player System | DSL/Cable Modem |
Use Scenario: Converting automotive 12 V battery supply to 1.1 V CPU core, 3.3 V display interface, and 5 V USB OTG port. IC Role / Device Role / Timing Role: High-input-voltage PMIC with UVLO (4.1 V) and thermal protection for under-hood temperature cycling. Use Value: Withstands cold-crank transients down to 4.5 V; maintains regulation during engine start without brownout resets. |
Use Scenario: Generating 1.2 V DSP core, 2.5 V memory, 3.3 V PHY, and 5 V USB from 12 V wall adapter in space-constrained modem PCB. IC Role / Device Role / Timing Role: Dual-buck regulator with independent EN/SS pins enabling staggered rail bring-up to avoid inrush current peaks. Use Value: Achieves >92% efficiency at full load (12 V → 1.2 V/3 A) and meets FCC Class B conducted emissions with minimal external filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck + USB switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65251RHDT | Lacks USB switch; identical buck architecture, same pinout, but no rUSB/USB_EN/USB_nILIM pins. | Suitable only where USB power switching is handled externally or omitted. | Select TPS65251RHDT if USB functionality is unnecessary and cost reduction is prioritized. |
| TPS65261RHBR | Higher current (4-A/3-A), adds third buck channel and I²C interface; larger 32-pin QFN package. | Targets multi-rail systems requiring dynamic voltage scaling or firmware-controlled sequencing. | Choose TPS65261RHBR when additional regulation channels or digital control are required beyond TPS65252RHDT's analog-only feature set. |
Compared with TPS65252RHDT, TPS65251RHDT removes USB integration but retains identical buck performance and footprint - ideal for non-USB designs. TPS65261RHBR expands capability with a third buck and I²C, yet increases complexity and board area - justified only when advanced programmability or extra rail count is mandatory.
Availability
TPS65252RHDT is available at Aetrix Electronics and suitable for set-top box power supplies, home gateway routers, and car DVD player systems requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for TPS65252RHDT 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 solutions, with decades of expertise in high-reliability DC/DC conversion and system-level power architecture.
TPS65252RHDT belongs to TI's integrated power management IC product line, designed specifically for space-constrained consumer and industrial applications needing dual high-current buck regulation, USB power switching, and robust supervision - without external discrete components.
FAQ
What is the maximum supported input voltage for TPS65252RHDT?
The TPS65252RHDT supports an absolute maximum input voltage of 18 V on VIN1 and VIN2 pins, with recommended operating range from 4.5 V to 16 V. Operation above 16 V risks exceeding safe operating area limits and may trigger internal UVLO or thermal shutdown. The device is rated for automotive cold-crank conditions down to 4.5 V, making it suitable for 12-V battery systems with transient tolerance.
How do I configure the USB current limit on TPS65252RHDT?
The USB current limit on TPS65252RHDT is set by connecting a resistor from the rUSB pin to GND: 154 kΩ yields 0.55 A typical limit, and 76.8 kΩ yields 1.10 A typical limit. The USB switch activates only when USB_EN is high and USB_VIN is within 3.3–6 V. Overcurrent detection asserts USB_nILIM low after 6 ms deglitch, and thermal shutdown triggers at 130°C junction temperature.
Does TPS65252RHDT support independent enable and soft-start for each buck converter?
Yes, TPS65252RHDT provides fully independent control: EN1/EN2 and SS1/SS2 pins allow separate sequencing and soft-start timing for Buck1 and Buck2. A ceramic capacitor on ENx adds ~1.67 ms delay per nF; SSx uses a 5 µA internal current source - e.g., 4.7 nF yields ~0.8 ms soft-start. This enables staggered rail bring-up to manage inrush current in multi-rail systems.
What is the purpose of the LOW_P pin on TPS65252RHDT?
The LOW_P pin on TPS65252RHDT enables pulse-skipping mode across both buck converters when driven high (VIH ≥ 1.55 V). In this mode, quiescent current drops from 10 mA to 0.5 mA under no-load conditions, significantly improving light-load efficiency. Regulation is maintained via skip-comparator feedback, and the device resumes forced PWM operation automatically when load exceeds threshold.
Can TPS65252RHDT operate with different input voltages on VIN1 and VIN2?
Yes, TPS65252RHDT supports independent inputs: VIN1 powers Buck1 and VIN2 powers Buck2. Each input must be within 4.5–16 V and can differ - e.g., VIN1 = 12 V (for 1.2 V core rail), VIN2 = 5 V (for 3.3 V I/O rail). However, both inputs share common ground, and the internal V7V and V3V LDOs derive from the higher of the two VIN supplies, ensuring stable bias under mixed-input operation.
TPS65252RHDT 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:
- 3A, 2A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-VQFN (5x5)
TPS65252RHDT FAQ
1.How can I place an order for TPS65252RHDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65252RHDT 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 TPS65252RHDT reliable?
The price and inventory of TPS65252RHDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65252RHDT is usually 5 days.
3.What payment methods are accepted for TPS65252RHDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65252RHDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65252RHDT?
TPS65252RHDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65252RHDT 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 TPS65252RHDT?
For technical support, including TPS65252RHDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65252RHDT requirements.
6.How does Aetrix verify that TPS65252RHDT is sourced from the original manufacturer or authorized distributors?
All TPS65252RHDT 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 TPS65252RHDT meets industry standards.
7.What is the process for return or replacement of TPS65252RHDT?
All TPS65252RHDT units undergo pre-shipment inspection (PSI). If there is an issue with TPS65252RHDT, 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 TPS65252RHDT part is unused and in its original packaging.
Return procedure for TPS65252RHDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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