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Texas Instruments 905-6525100
- Part No.:
- 905-6525100
- Manufacturer:
- Texas Instruments
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905-6525100.pdf
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Product details
Overview
TPS65251 from Texas Instruments is a triple-output synchronous step-down DC-DC converter IC with integrated high- and low-side MOSFETs, designed for 4.5 V to 18 V input systems. It delivers continuous output currents of 3 A (Buck 1), 2 A (Buck 2), and 2 A (Buck 3), features adjustable switching frequency from 300 kHz to 2.2 MHz, and supports independent enable/soft-start/control per channel - used in automotive infotainment power rails and multi-rail set-top box supplies.
For engineers reviewing the TPS65251 datasheet, TPS65251 pinout, TPS65251 application, or TPS65251 equivalent, key selection considerations include per-channel current limit adjustability via RLIM pins, 180° out-of-phase operation between Buck 1 and Buck 2/3 to reduce input ripple, PGOOD monitoring with 1-s reset delay, and compatibility with external synchronization or ROSC-based frequency setting.
Technical Context
The TPS65251 implements peak current-mode control across all three buck channels, enabling stable loop compensation with simple RC networks on COMP pins and built-in slope compensation to prevent subharmonic oscillation. Each channel uses an internal 0.8 V reference with ±1% accuracy at 25°C and ±2% over full temperature and input range.
It integrates dual LDOs (3.3 V and ~6.5 V) for standby biasing, supports light-load pulse-skipping mode (PSM) when LOW_P is tied to V3V, and provides hiccup-mode overcurrent protection triggered by sustained >10 ms overload - with thermal shutdown at 160°C and 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 5 V, 9 V, 12 V, and 15 V system rails without external pre-regulation. |
| Output Current (Continuous) | 3 A (Buck 1), 2 A (Buck 2), 2 A (Buck 3) - enables single-chip power for multi-voltage SoC subsystems. |
| Switching Frequency Range | 300 kHz to 2.2 MHz - adjustable via ROSC resistor or synchronized to external clock on SYNC pin. |
| Feedback Reference Voltage | 0.8 V ±1% (25°C), ±2% (–40°C to 125°C) - sets output voltage via external resistor divider with tight regulation tolerance. |
| Current Limit Adjustment | RLIM1: 75–300 kΩ → 1.2–5.5 A; RLIM2/3: 100–300 kΩ → 1–4.4 A - allows optimized inductor sizing and peak-current margining. |
| Powergood Assertion | Open-drain PGOOD asserted after all outputs reach ≥90% nominal and 1 s reset timer expires - enables reliable system sequencing and reset control. |
| Thermal Shutdown | 160°C trip with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
VQFN-40 (RHA), 6 mm × 6 mm, thermally enhanced with exposed power pad soldered to GND plane for optimal heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2, EN3 | Independent enable inputs | Each controls startup timing; weak internal 1-µA pullup to V3V enables auto-enable if left floating. |
| SS1, SS2, SS3 | Soft-start capacitor nodes | 5 µA internal current source charges external cap; 4.7 nF yields ~1 ms soft-start time per channel. |
| RLIM1, RLIM2, RLIM3 | Peak current limit programming | Resistor-to-GND sets channel-specific current limit - enables precise inductor selection and fault margining. |
| BST1, BST2, BST3 | Bootstrap supply terminals | Require 47 nF ceramic cap to LXx; powers high-side FET gate driver - critical for efficient synchronous operation. |
| FB1, FB2, FB3 | Feedback inputs | Monitor output voltage via resistor divider; 0.8 V reference enables adjustable outputs from 0.8 V to near VIN. |
| LX1, LX2, LX3 | Switching node outputs | Connect to external inductors; Buck 1 and Buck 2 operate 180° out-of-phase to minimize input ripple. |
| PGOOD | Power-good status indicator | Open-drain output active-high after all rails stabilize and 1 s reset timer completes - used for system enable/reset logic. |
| SYNC | External clock synchronization input | Accepts 0.2–2.2 MHz external clock; ignored during startup - ensures deterministic timing in multi-converter systems. |
| LOW_P | Low-power mode control | Active-high input enabling pulse-skipping mode (PSM) to reduce quiescent current to 1.5 mA under light load. |
| VIN, VIN1, VIN2, VIN3 | Input supply connections | Multiple VIN pins support distributed decoupling; each requires local 10 µF X7R ceramic capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Triple synchronous buck with integrated FETs | Eliminates need for 6 external MOSFETs and associated gate drivers - reduces BOM count and layout complexity. |
| Per-channel enable, soft-start, and current limit | Enables flexible power sequencing, controlled inrush current, and tailored overcurrent protection per rail. |
| 180° phase shift between Buck 1 and Buck 2/3 | Reduces RMS input ripple current by up to 50%, allowing smaller input capacitors and lower EMI filter cost. |
| Adjustable 300 kHz–2.2 MHz switching frequency | Supports optimization for efficiency (low fSW) or size (high fSW) - e.g., 1 MHz enables use of compact 4.7 µH inductors. |
| Integrated 3.3 V and ~6.5 V LDOs | Provides always-on bias for microcontrollers or sensors during buck shutdown - improves system-level standby efficiency. |
Applications
| Automotive Infotainment | Set-Top Box Power |
|---|---|
|
Use Scenario: Powering SoC core (1.2 V), I/O (3.3 V), and audio amplifier (7.5 V) in head-unit designs. IC Role / Device Role / Timing Role: Primary multi-rail PMIC delivering regulated voltages with independent sequencing and PGOOD coordination. Use Value: Single-package solution replaces discrete buck controllers + external FETs, reducing board area by >35% and simplifying thermal management. |
Use Scenario: Supplying processor core, memory interface, and HDMI PHY in DTV and Blu-ray players. IC Role / Device Role / Timing Role: Central power management IC providing tightly regulated, sequenced outputs with hiccup-mode fault recovery. Use Value: 180° phase interleaving cuts input capacitor requirements by half versus in-phase converters - lowering total solution cost. |
| Security Camera System | Car Audio DSP Platform |
|
Use Scenario: Generating 1.8 V (image sensor), 3.3 V (MCU), and 5 V (IR illuminator) from 12 V vehicle supply. IC Role / Device Role / Timing Role: High-efficiency triple buck regulator supporting wide-input automotive transients (4.5–18 V). Use Value: Adjustable current limit (via RLIM pins) allows matching inductor saturation current to actual load profiles - avoiding overdesign. |
Use Scenario: Powering digital signal processor, ADC/DAC, and Class-D amplifier in premium car audio head units. IC Role / Device Role / Timing Role: Multi-output DC-DC controller with PSM mode for ultra-low quiescent current (<1.5 mA) during standby. Use Value: Pulse-skipping mode reduces no-load input power by >85% versus forced PWM - extending battery-backed operation time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-buck PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65253 | Same pinout and feature set but rated for 4.5–28 V input; higher VIN max and improved thermal performance (RθJA = 26°C/W). | Preferred for 24 V industrial or commercial systems where input transients exceed 18 V. | Select TPS65253 when operating above 18 V or requiring tighter thermal margin in high-ambient environments. |
| MP2451DT-LF-Z | Single-channel 3 A buck only; no integrated multi-rail control, sequencing, or PGOOD - requires external logic for coordination. | Suitable only when one rail dominates load and others are derived via LDOs or secondary converters. | Choose MP2451DT-LF-Z only for cost-sensitive single-rail designs where TPS65251's integration adds unnecessary complexity. |
Compared with TPS65253, the TPS65251 offers identical functionality at lower maximum input voltage but lower cost and broader distributor availability; compared with MP2451DT-LF-Z, it delivers full multi-rail integration with sequencing and fault management - eliminating external coordination circuitry.
Availability
TPS65251 is available at Aetrix Electronics and suitable for automotive infotainment, set-top box, and security camera applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65251 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 automotive-grade reliability validation.
The TPS65251 belongs to TI's high-current multi-buck PMIC product line, engineered specifically for space-constrained consumer and automotive applications demanding independent rail control, low-light-load efficiency, and robust fault handling.
FAQ
What is the maximum input voltage rating for the TPS65251?
The TPS65251 has an absolute maximum input voltage rating of 20 V on VIN, VIN1, VIN2, and VIN3 pins, with transient withstand capability up to 23 V for <10 ns pulses. Its recommended operating range is 4.5 V to 18 V - making it suitable for 12 V automotive and industrial systems with typical supply variations and transients. Exceeding 18 V continuously may trigger UVLO or degrade long-term reliability.
How does the TPS65251 achieve reduced input ripple current?
The TPS65251 reduces input ripple current through 180° out-of-phase operation between Buck 1 and Buck 2/3 - while Buck 2 and Buck 3 run in phase. This interleaving minimizes the net input current variation, allowing smaller bulk input capacitors and lower EMI filter requirements. The effect is most pronounced at higher load currents and mid-to-high switching frequencies (e.g., 1 MHz).
Can the TPS65251 be synchronized to an external clock?
Yes, the TPS65251 can be synchronized to an external clock applied to the SYNC pin, supporting frequencies from 0.2 MHz to 2.2 MHz. Synchronization begins only after PGOOD is asserted - ensuring stable internal operation before locking to the external signal. When not used, SYNC must be tied to GND to avoid noise coupling or unintended behavior.
What is the purpose of the LOW_P pin on the TPS65251?
The LOW_P pin enables pulse-skipping mode (PSM) for light-load efficiency improvement. When pulled high to V3V, it activates PSM - reducing quiescent current to 1.5 mA and minimizing switching losses during standby. When grounded, the device operates in fixed-frequency PWM mode. This pin directly controls the converter's light-load behavior without requiring external logic or configuration registers.
How is output voltage adjusted on the TPS65251?
Output voltage on the TPS65251 is set using a resistor divider from the output to the corresponding FB pin (FB1/FB2/FB3), referenced to an internal 0.8 V precision bandgap. For example, a 40.2 kΩ top resistor and 10.0 kΩ bottom resistor yields 5.02 V. TI recommends 1% tolerance resistors and placement close to the FB pin to minimize noise sensitivity and ensure regulation accuracy within ±2% over temperature and line/load conditions.
905-6525100 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
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905-6525100 FAQ
1.How can I place an order for 905-6525100 through Aetrix?
Please submit a Request for Quotation (RFQ) for 905-6525100 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 905-6525100 reliable?
The price and inventory of 905-6525100 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 905-6525100 is usually 5 days.
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905-6525100 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 905-6525100 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 905-6525100?
For technical support, including 905-6525100 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 905-6525100 requirements.
6.How does Aetrix verify that 905-6525100 is sourced from the original manufacturer or authorized distributors?
All 905-6525100 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 905-6525100 meets industry standards.
7.What is the process for return or replacement of 905-6525100?
All 905-6525100 units undergo pre-shipment inspection (PSI). If there is an issue with 905-6525100, 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 905-6525100 part is unused and in its original packaging.
Return procedure for 905-6525100:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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