TPS40077PWP - 28V Sync Buck Controller w/ VFF | Texas Instruments
MPN: TPS40077PWP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.52 | $35.20 |
| 100 | $3.05 | $305.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.2 | $2,200.00 |
| 2,500 | $1.85 | $4,625.00 |
TPS40077PWP Overview
A buck controller (step-down DC-DC controller) is a power-management IC that regulates an output voltage lower than its input by chopping the input with one or more switches and averaging the result with an LC filter. The TPS40077PWP belongs to the wider family of DC-DC switching controllers, which sit one tier above the more familiar point-of-load converters and below the broad category of power management ICs used in distributed power architectures.
Key features include a wide 4.5-V to 28-V input range that targets industrial, telecom and 12-V/24-V bus rails, programmable operating frequency up to 1 MHz, programmable soft-start, under-voltage lockout (UVLO), and high-side FET-sensed short-circuit protection. The HTSSOP-16 PowerPAD package provides a low thermal resistance of approximately 32 C/W (theta_JA) so the controller can deliver tens of amps when used with appropriately sized external MOSFETs.
The TPS40077 uses a voltage-mode control architecture with input voltage feed-forward, which keeps the loop gain and bandwidth relatively constant across the full 4.5-V to 28-V input range - useful when the source is a varying 12-V/24-V bus or a battery whose voltage changes with state of charge. Internal bootstrap and adaptive dead-time drive circuitry simplify gate-drive design and minimize body-diode conduction losses across the low-side switch.
Typical applications include telecom and networking equipment (typically 24-V or 12-V distributed bus), industrial point-of-load regulation from 24-V supplies, high-current single-rail POL converters for FPGAs/ASICs, and battery-powered systems where the input voltage varies over a wide range. The 1 MHz switching frequency allows smaller inductors and capacitors in space-constrained designs.
When designing with this device, choose the inductor based on ripple current (~20-30% of IOUT), select low-RDS(on) N-MOSFETs with adequate SOA for the high-side switch, and lay out the switching-node loop as compactly as possible. Always connect the PowerPAD to a sufficient copper pour on the top layer for thermal dissipation, since the controller itself carries the gate-drive losses but does not switch load current directly.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers an at-a-glance reference for board bring-up and BOM risk management.
Drop-in alternatives for TPS40077PWP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS40077PWPR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS40077PWPG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS40077PWPRG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS40071PWPG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS40077PWP Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) Controller |
| Control Mode | Voltage Mode with Voltage Feed-Forward |
| Input Voltage Range | 4.5 V to 28 V |
| Number of Outputs | 1 |
| Output Voltage Range | 0.7 V to 5.5 V (typical, set by external divider) |
| Switching Frequency | Up to 1 MHz (programmable) |
| MOSFET Driver Type | External N-channel, synchronous (high-side + low-side) |
| Soft-Start | Programmable via external capacitor |
| UVLO | Programmable under-voltage lockout |
| Short-Circuit Protection | High-side FET-sensed |
| Operating Temperature Range | -40 C to +85 C |
| Package | HTSSOP-16 (PWP) PowerPAD |
| Thermal Resistance (theta_JA) | Approximately 32 C/W (with proper PowerPAD layout) |
| Mounting Type | Surface Mount |
| MSL Level | 2 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
TPS40077PWP Pin Configuration
| Pin 1 | BOOT — Bootstrap capacitor connection for high-side gate drive |
| Pin 2 | UGATE — High-side MOSFET gate drive output |
| Pin 3 | PH — Phase node - connects to high-side source, low-side drain and external L |
| Pin 4 | LGATE — Low-side MOSFET gate drive output |
| Pin 5 | VBIAS — Internal bias supply decoupling |
| Pin 6 | VIN — Input supply voltage (4.5V to 28V) |
| Pin 7 | VREF — Internal reference voltage output (typically 3.3 V) |
| Pin 8 | PWRGD — Power-good open-drain output |
| Pin 9 | SS/SD — Soft-start / shutdown programming capacitor node |
| Pin 10 | RT/SS — Frequency-timing resistor and soft-start node |
| Pin 11 | FB — Feedback voltage input from external divider |
| Pin 12 | COMP — Error amplifier output / compensation network node |
| Pin 13 | SYNC — Synchronization input for external clock |
| Pin 14 | GND — Analog ground |
| Pin 15 | PGND — Power ground for gate drivers |
| Pin 16 | NC — Not connected (per datasheet) - leave floating or to GND |
Typical Applications
TPS40077PWP is suitable for 6 applications: Telecom 24V Bus Point-of-Load Conversion, Industrial 24V Sensor and Actuator Rails, FPGA/ASIC Core and I/O Voltage Rails, Battery-Powered Portable Equipment, Automotive 12V Accessory Rails, Distributed 5V/12V POL for Networking Switches.
Telecom 24V Bus Point-of-Load Conversion
The TPS40077PWP's 4.5-V to 28-V input range and 1 MHz switching frequency make it well-suited to telecom boards powered from a 24-V or 12-V distributed bus. Voltage feed-forward holds the loop bandwidth roughly constant as the bus droops under load, which is critical for downstream POL rails that must remain within spec during transient bus events. Compared with a discrete buck implementation, the TPS40077PWP shrinks the BOM by integrating UVLO, soft-start, short-circuit protection and adaptive dead-time drive, freeing board area for magnetics and output capacitors. Typical target output is 3.3 V or 1.8 V at 5-15 A, depending on the selected external MOSFETs.
Recommended
Industrial 24V Sensor and Actuator Rails
Industrial sensor and actuator systems commonly run from 24-V backplanes and need compact, rugged buck rails at 5 V, 3.3 V or 1.8 V. The TPS40077PWP delivers these rails with high efficiency by driving synchronous N-MOSFETs, and its -40 C to +85 C operating range covers most industrial environments. The exposed PowerPAD enables continuous high-current operation with proper top-layer copper, while programmable UVLO and soft-start let designers match inrush to the upstream fuse or hot-swap controller. Where isolation or higher voltages are required, a front-end isolated DC-DC can feed the TPS40077PWP from a rectified bus.
Recommended
FPGA/ASIC Core and I/O Voltage Rails
Modern FPGAs and ASICs require multiple low-voltage, high-current rails (e.g., 0.85 V, 1.0 V, 1.8 V, 3.3 V) that must be sequenced with tight transient tolerance. The TPS40077PWP supports 1 MHz operation with feed-forward, allowing small inductors and fast load-step response that satisfy core-rail transient specs. Its external N-MOSFET architecture scales output current by MOSFET selection, so a single controller can serve a 3-A or a 20-A rail simply by changing FETs. Designers commonly pair it with a TPS3700DDCR for sequencing and a TLV431IDBVR for the feedback reference.
Recommended
Battery-Powered Portable Equipment
Battery systems see the source voltage drop as cells discharge, which can destabilize conventional buck converters whose loop bandwidth varies with VIN. The TPS40077PWP's voltage feed-forward compensates for this, keeping small-signal behavior roughly constant from a full charge down to the cutoff voltage. Combined with a programmable UVLO, this allows the controller to ride out pack droop and disconnect cleanly at the end of discharge. The HTSSOP-16 PowerPAD is small enough for handheld designs, and 1 MHz operation lets engineers use miniature chip inductors to shrink the magnetics footprint.
Recommended
Automotive 12V Accessory Rails
Although the TPS40077PWP is not AEC-Q100 qualified, its 4.5-V to 28-V input range comfortably covers 12-V automotive rails including cranking transients, making it usable in non-agonistic automotive accessory designs. The high-side FET-sensed short-circuit protection provides fast fault response that protects cabling in load-dump or short-to-ground events. Designers building 12-V body-electronics modules (lighting controllers, accessory switches, infotainment sub-rails) often select the TPS40077PWP for its balance of cost, frequency and robustness. For safety-critical or AEC-Q100 mandated rails, choose a TPS40077-Q1 derivative instead.
Recommended
Distributed 5V/12V POL for Networking Switches
Routers, switches and base-station cards typically step a 12-V or 24-V intermediate bus down to 5 V, 3.3 V and sub-1.8 V rails for ASICs, PHYs and SerDes. The TPS40077PWP's 1 MHz switching frequency minimizes input/output ripple amplitude, easing EMI compliance for these EMI-sensitive products. Voltage feed-forward keeps the converter stable as the bus sags under heavy switching loads, while the external-N-MOSFET architecture lets designers scale output current by picking appropriate FETs. Multiple TPS40077PWPs are typically paralleled on different rails in the same board, all driven from a common 12-V/24-V bus.
Recommended
Recommended Products Summary
Engineering reference data for TPS40077PWP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS40077PWPR | TPS40077PWPG4 | TPS40077PWPRG4 | TPS40071PWPG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | HTSSOP-16 (PWP) | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same |
| Input Voltage Range | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V | 4.5 V to 28 V |
| Switching Frequency (max) | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz |
| Topology | Synchronous Buck (External FETs) | Synchronous Buck (External FETs) | Synchronous Buck (External FETs) | Synchronous Buck (External FETs) | Synchronous Buck (External FETs) |
| Voltage Feed-Forward | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Approx. Unit Price (qty 100, as of 2026-10-11) | $3.05 | ~$3.05 | ~$3.05 | ~$3.05 | ~$3.10 |
| Lifecycle Status | Active | Active | Active | Active | Active |
Key Differentiators
- Highest switching frequency in the TPS4007x family (vs TPS40057PWPG4)
- Voltage feed-forward for line-transient immunity (vs TPS40060PWPRG4)
- Wider input range than TPS40071 family (vs TPS40071PWPG4)
Design Notes
Estimated: the TPS40077PWP's gate-drive losses scale with switching frequency and total gate charge Qg of the external MOSFETs. At fsw = 500 kHz with two typical logic-level N-FETs of Qg = 20 nC each, controller dissipation is approximately P_drv = Qg * Vfsw * fs_dt * fsw = 40 nC * 5 V * 2 * 500 kHz = 200 mW, giving a junction rise of roughly 6 C above ambient on the HTSSOP-16 PowerPAD (theta_JA approximately 32 C/W). At 1 MHz with larger FETs, drive losses can exceed 1 W, so a top-layer copper pour of at least 1 square inch is recommended. The PowerPAD must be soldered to ground for both thermal and electrical performance.
Place the input ceramic bypass capacitor (typically 1 uF X7R) directly between VIN and PGND with traces short and wide, and place the BOOT capacitor (typically 0.1 uF) between BOOT and PH right at the IC pins. Keep the PH switching-node copper area small to minimize radiated EMI, and route the FB trace away from PH, UGATE and LGATE to avoid noise coupling into the feedback path. Use a single star-ground connection between PGND (pin 15) and analog GND (pin 14) under the IC, with the PowerPAD also tied to this ground.
Do not operate below the programmed UVLO threshold - if VIN is below the UVLO setting, the controller will not switch and the output will collapse. Ensure the soft-start capacitor on SS/SD is sized large enough to limit inrush to the FET SOA at full load, otherwise the high-side FET can fail during start-up into a large output capacitance. Voltage feed-forward assumes a clean VIN ramp; if VIN is fed through a long cable or hot-swap FET, add local bulk capacitance to avoid false triggering of the feed-forward loop. Finally, the RT/SS pin serves dual functions - choose the timing resistor before reaching the SS pin decoupling capacitor to avoid start-up glitches.
Compliance Information
RoHS and lead-free per TI HTSSOP-16 PowerPAD product family documentation. Not AEC-Q100 qualified - choose an automotive-grade derivative for safety-critical designs. Halogen-free status not stated explicitly in the verified web data, set to unknown.
