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Texas Instruments TPS65250RHAR
- Part No.:
- TPS65250RHAR
- Manufacturer:
- Texas Instruments
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
TPS65250RHAR.pdf
- Description:
- IC REG BCK ADJ 3A/2A TRPL 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,069
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Product details
Overview
TPS65250RHAR from Texas Instruments is a triple-output synchronous buck converter IC with integrated high-side/low-side FETs, designed for xDSL/xPON modems and home gateways. It delivers 3 A (Buck 1), 2 A (Buck 2), and 2 A (Buck 3) across 4.5–18 V input, features 0.8 V ±1% reference accuracy, adjustable 300 kHz–2.2 MHz switching frequency, and on-chip dying gasp storage/release circuitry supporting 10.5 V release voltage and 20.1 V storage voltage.
For engineers reviewing the TPS65250RHAR datasheet, TPS65250RHAR pinout, TPS65250RHAR application, or TPS65250RHAR equivalent, this device is selected for multi-rail telecom power systems requiring sequenced start-up, low-power mode control, dying gasp hold-up, and in-phase/out-of-phase interleaving to minimize input ripple.
Technical Context
The TPS65250RHAR integrates three current-mode controlled synchronous buck regulators with independent enable, soft-start, compensation, and current-limit pins. Buck 1 operates out-of-phase with Bucks 2 and 3 (which run in-phase), reducing input capacitor stress. Each regulator supports external resistor-set peak current limit (ILIM1: 1.2–5.5 A; ILIM2/3: 1–4.4 A) and RC compensation for transient/dc trade-off tuning.
Its dedicated dying gasp circuit includes STRG, BSTDG, VINDG, LDODG, and GASP terminals - enabling controlled precharge of an external storage capacitor up to 20.1 V, followed by regulated dump to maintain VIN ≥10.5 V during brownout. The low-power mode (LOW_P pin) reduces quiescent current from 20 mA to 1.5 mA while preserving critical LDO outputs (V3V, V7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports universal AC/DC adapter inputs including 5 V, 9 V, 12 V, and 15 V systems. |
| Output Current Capability | Buck 1: 3 A continuous / 3.5 A peak; Bucks 2 & 3: 2 A continuous / 2.5 A peak - enables simultaneous powering of CPU core, I/O, and line driver rails. |
| Feedback Reference Voltage | 0.8 V ±1% at TJ = 25°C - ensures precise output regulation across all three channels with minimal drift over temperature. |
| Switching Frequency Range | 300 kHz to 2.2 MHz - set via ROSC resistor or synchronized externally; allows optimization of efficiency vs. size (e.g., 1.14 MHz for 4.7 µH inductors). |
| Dying Gasp Release Voltage | 10.5 V ±5% - triggers controlled energy dump from storage capacitor to sustain system operation during input brownout. |
| Storage Voltage Target | 20.1 V ±5% - maximizes stored energy (½CV²) while staying below 2×VIN –1.5 V safety limit. |
| Quiescent Current (Low-Power Mode) | 1.5 mA - reduces standby power consumption in host-sleep states without disabling critical bias rails. |
Pinout & Package
TPS65250RHAR is housed in a thermally enhanced 40-pin QFN package (RHA), 6 mm × 6 mm, with exposed thermal pad. Pin count and layout are validated per TI SLVSAA3C datasheet Figure 5 (Pin Out) and Terminal Functions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1–EN3 | Enable inputs | Independent logic-level control for sequencing; internal weak pull-up to V3V enables automatic start if left floating. |
| SS1–SS3 | Soft-start inputs | Capacitor-programmable ramp time; 5 µA current source sets tSS ≈ 5 µA × CSS. |
| FB1–FB3 | Feedback inputs | 0.8 V reference point; connects to resistor divider for adjustable output voltage (VOUT = 0.8 × (1 + R1/R2)). |
| COMP1–COMP3 | Compensation outputs | Connect RC network to tune loop stability - balances transient response vs. DC accuracy. |
| RLIM1–RLIM3 | Current limit setting | Resistor-to-ground sets peak inductor current: ILIM1 = 1.2–5.5 A; ILIM2/3 = 1–4.4 A. |
| STRG, BSTDG, VINDG, LDODG, GASP | Dying gasp interface | On-chip pump-and-dump control: STRG stores charge; GASP signals active dump; LDODG provides 18-V auxiliary supply. |
| LX1–LX3 | Switching nodes | High-current outputs (pins 14–15, 16–17, 36–37); require low-ESR ceramic bootstrap caps (47 nF) at BSTx pins. |
| PGOOD | Power-good flag | Open-drain active-high signal asserted after all rails stabilize and reset timeout expires - used for processor boot coordination. |
Key Features
| Feature | Design Value |
|---|---|
| Triple synchronous buck with integrated FETs | Eliminates 6 external MOSFETs and drivers - reduces BOM count and PCB area in space-constrained modem designs. |
| Interleaved phase control (Buck 1 vs. Bucks 2+3) | 180° out-of-phase operation cuts RMS input ripple current by ~30%, allowing smaller input capacitors. |
| On-chip dying gasp storage/release | Reduces required hold-up capacitance by >50% versus discrete solutions - enables compact 12-V adapter compatibility. |
| Adjustable low-power mode | Reduces total input current from 20 mA to 1.5 mA during host sleep - extends battery backup time in UPS-integrated systems. |
| Independent enable/soft-start/compensation per channel | Enables precise rail sequencing, custom soft-start timing, and optimized transient response for mixed-signal SoCs. |
Applications
| xDSL/xPON Modems | Cable Modems |
|---|---|
Use Scenario: Powering ADSL2+ chipset with core (1.2 V), I/O (2.5 V), and line driver (7.5 V) rails under 12-V AC/DC adapter input. IC Role / Device Role / Timing Role: Primary multi-rail PMIC managing sequenced start-up, dying gasp hold-up during power loss, and low-power mode during deep sleep. Use Value: Enables single 12-V adapter instead of bulky 22-V supply; reduces storage cap size by 60% using 20.1 V on-chip charging. |
Use Scenario: Supplying DOCSIS-compliant cable modem SoC with 3.3 V (CPU), 2.5 V (PHY), and 7.5 V (RF amplifier) outputs. IC Role / Device Role / Timing Role: Central power controller coordinating rail enable timing, monitoring PGOOD for firmware boot, and signaling GASP to initiate graceful shutdown. Use Value: GASP pin directly triggers host processor's dying gasp routine - eliminates need for external supervisor IC or GPIO polling. |
| Home Gateway & Access Points | Set-Top Box Power Management |
Use Scenario: Delivering clean, sequenced power to dual-band Wi-Fi SoC (1.1 V core, 3.3 V I/O, 5 V USB PHY) in residential gateway. IC Role / Device Role / Timing Role: Triple-buck regulator with independent EN/SS pins enabling staggered rail activation to avoid inrush overload on shared 12-V bus. Use Value: RLIMx pins allow inductor saturation current matching - prevents overdesign and saves cost on magnetics. |
Use Scenario: Supporting STB main board with 1.2 V SoC core, 3.3 V memory interface, and 12 V tuner supply during grid brownout events. IC Role / Device Role / Timing Role: Dying gasp manager maintaining VIN above 10.5 V long enough to save state and shut down cleanly before full power loss. Use Value: On-chip storage voltage regulation to 20.1 V ensures maximum energy retention (½CV²) without external voltage clamp circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-buck PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65261RHBR | Higher input range (4.5–28 V); no integrated dying gasp circuit; fixed 1.2-MHz frequency; lower max current (2.5 A per buck). | Suitable for industrial 24-V systems where brownout hold-up is handled externally; lacks GASP/STRG interface. | Select when input exceeds 18 V or dying gasp is implemented discretely; not drop-in due to missing storage/release pins. |
| RTQ2132B-QA | Automotive-grade AEC-Q100; 3.0–18 V input; integrated watchdog; no dying gasp; 3-A per channel; 2.1-MHz max frequency. | Targeted at automotive infotainment; includes fault reporting and reset generation not present in TPS65250RHAR. | Choose for automotive environments requiring qualification; requires redesign for GASP signaling and storage capacitor management. |
Compared with TPS65261RHBR and RTQ2132B-QA, the TPS65250RHAR uniquely integrates dying gasp storage/release circuitry with dedicated STRG/GASP pins and 20.1 V storage voltage capability - making it the only option among the three for telecom equipment requiring compact, self-contained brownout hold-up.
Availability
TPS65250RHAR is available at Aetrix Electronics and suitable for xDSL modems, cable modems, and home gateway systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS65250RHAR 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 and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing reliability.
The TPS65250RHAR belongs to TI's broadband communications PMIC product line, engineered specifically for DSL, PON, and cable infrastructure equipment needing multi-rail sequencing, dying gasp resilience, and compact 12-V adapter compatibility.
FAQ
What is the function of the GASP pin on the TPS65250RHAR?
The GASP pin on the TPS65250RHAR is an open-drain output that signals active dying gasp operation to the host processor. It asserts low when the storage capacitor begins discharging into VIN to maintain input voltage above 10.5 V during brownout. This allows the host to initiate emergency data save or graceful shutdown without polling - a key feature distinguishing the TPS65250RHAR from standard triple-buck converters.
Can the TPS65250RHAR operate with a 5-V input supply?
Yes, the TPS65250RHAR supports input voltages from 4.5 V to 18 V, making it fully operational with a 5-V supply. At 5-V input, Buck 1 can deliver up to 3 A at output voltages ≥0.8 V (e.g., 3.3 V), while Bucks 2 and 3 support 2 A each. Note that minimum output voltage is limited to VIN − 1 V, so 5-V input supports outputs up to 4 V.
How is the switching frequency set on the TPS65250RHAR?
The TPS65250RHAR switching frequency is set either by connecting a resistor from ROSC to GND (for autonomous operation) or by applying an external clock to the SYNC pin. For ROSC-based configuration, a 230-kΩ resistor yields ~800 kHz; values from 50 kΩ to 600 kΩ support 0.3–2.2 MHz. When using SYNC, the external clock must be within 0.2–2.2 MHz and the ROSC resistor must still be fitted at ~70% of target frequency.
Does the TPS65250RHAR support independent rail sequencing?
Yes, the TPS65250RHAR supports full independent rail sequencing via dedicated EN1, EN2, and EN3 pins. Each enable input accepts logic-level control and includes internal weak pull-up to V3V. Adding small ceramic capacitors from ENx to GND creates programmable delay times, allowing precise staggered start-up - critical for avoiding inrush current overload in multi-rail systems.
What is the purpose of the STRG and BSTDG pins on the TPS65250RHAR?
The STRG (Storage) and BSTDG (Bootstrap for Dying Gasp) pins on the TPS65250RHAR implement the on-chip dying gasp circuit. STRG connects to the external storage capacitor and is actively charged to 20.1 V during normal operation. BSTDG supplies bootstrap voltage for the internal high-side switch during dump mode. Together with VINDG, LDODG, and GASP, they form a complete, self-contained pump-and-dump subsystem - eliminating need for external charge pumps or supervisors.
TPS65250RHAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 17.1V
- Current - Output:
- 3A, 2A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VQFN (6x6)
TPS65250RHAR FAQ
1.How can I place an order for TPS65250RHAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65250RHAR 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 TPS65250RHAR reliable?
The price and inventory of TPS65250RHAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65250RHAR is usually 5 days.
3.What payment methods are accepted for TPS65250RHAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65250RHAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65250RHAR?
TPS65250RHAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65250RHAR 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 TPS65250RHAR?
For technical support, including TPS65250RHAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65250RHAR requirements.
6.How does Aetrix verify that TPS65250RHAR is sourced from the original manufacturer or authorized distributors?
All TPS65250RHAR 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 TPS65250RHAR meets industry standards.
7.What is the process for return or replacement of TPS65250RHAR?
All TPS65250RHAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65250RHAR, 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 TPS65250RHAR part is unused and in its original packaging.
Return procedure for TPS65250RHAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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