TPS40091PWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
TPS40091PWG4 is a high-current synchronous buck controller supporting up to 120 A output via external MOSFETs, operating from a 4.5 V to 15 V input supply in a 24-pin TSSOP package. It supports both voltage-mode and current-mode control, targeting high-density point-of-load and server processor power designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- TPS40091PWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Supports up to 120 A output current via external synchronous MOSFETs
- Dual-mode: voltage-mode PWM or current-mode operation selectable
- 4.5 V to 15 V wide input range covering 5 V and 12 V bus systems
- 24-pin TSSOP compact package for tight power stage layouts
- Programmable switching frequency for transformer and inductor sizing
- Differential remote voltage sensing for accurate output regulation
- Adjustable soft-start and overcurrent protection for safe power-up
Applications
TPS40091PWG4 is used to power server CPUs, GPUs, and FPGA cores requiring regulated 0.9 V to 1.8 V at 50 A to 120 A from a 12 V intermediate bus in data center and high-performance computing platforms. Its dual voltage-mode and current-mode capability suits multi-phase interleaved designs where precise per-phase current balancing reduces output ripple and thermal stress across paralleled power stages. Telecom line cards and network processing boards also deploy this controller to deliver tightly regulated low-voltage rails for packet-forwarding ASICs.
Specifications
| YTEOL | 0 |
| Additional Feature | IT CAN ALSO OPERATE WITH CURRENT MODE |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 15V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | R-PDSO-G24 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Voltage-Max | 5.2V |
| Output Voltage-Min | 4.8V |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP24,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Surface Mount | YES |
| Switcher Configuration | PHASE-SHIFT |
| Switching Frequency-Max | 1200kHz |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TPS40091PWG4:
Switching Controller, Current-mode, 120A, 1000kHz Switching Freq-Max, BICMOS, PDSO24
Frequently Asked Questions
How does TPS40091PWG4 scale to 120 A output in a server CPU power design?
TPS40091PWG4 drives external synchronous MOSFETs in a multi-phase buck topology. At 12 V input and 1.2 V output, using 4 interleaved phases each carrying 30 A achieves a combined 120 A delivery with only a fraction of the single-phase output ripple. Each phase requires a pair of N-channel MOSFETs with gate charge below 50 nC to maintain efficient switching at frequencies up to several hundred kHz while keeping total losses below 10 W across the full load range.
When should TPS40091PWG4 be configured for current-mode rather than voltage-mode control?
Current-mode control is preferred when the application requires faster transient response to load steps typical of modern CPU power domains, where current can slew at 50 A to 100 A per microsecond. Voltage-mode with a type-III compensator achieves similar bandwidth but requires more complex loop compensation. Current-mode simplifies inductor selection and naturally provides cycle-by-cycle overcurrent limiting at each phase, making it the preferred choice for 50 A to 120 A server VR designs from a 12 V bus.
What input voltage range does TPS40091PWG4 support and which power bus architectures does it cover?
TPS40091PWG4 operates from 4.5 V to 15 V, making it compatible with both 5 V and 12 V intermediate bus architectures common in server motherboards and telecom equipment. The 12 V nominal input is the most common deployment; the 4.5 V minimum allows operation from an unregulated 5 V rail that may dip under heavy load. For designs where the input exceeds 15 V, an upstream pre-regulator is required before connecting to the TPS40091PWG4 VIN pin.
How does differential remote sensing in TPS40091PWG4 improve output voltage accuracy at 120 A loads?
At 120 A, a 1 mΩ PCB trace resistance between the regulator output and the CPU socket creates a 120 mV drop that would erroneously raise the sensed voltage if measured at the inductor output. Differential remote sensing connects the feedback pins directly at the CPU load point, so the controller compensates for this drop and maintains the output within ±10 mV of the 1.2 V setpoint even at full 120 A load, meeting the tight voltage identification (VID) window required by modern processor power specifications.
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