TPS53624 - Dual-Phase D-CAP+ Buck Controller | Texas Instruments
MPN: TPS53624 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.12 | $3.12 |
| 10 | $2.81 | $28.10 |
| 100 | $2.48 | $248.00 |
| 500 | $2.14 | $1,070.00 |
| 1,000 | $1.86 | $1,860.00 |
TPS53624 Overview
A step-down (buck) controller is a type of switching voltage regulator that converts a higher input voltage to a lower output voltage using MOSFETs, an inductor, and a feedback control loop. Within the power management IC hierarchy, the TPS53624 sits at the controller level - it integrates the control loop and gate drivers but requires external power MOSFETs, giving designers flexibility to scale output current beyond what integrated converters achieve.
Key features include the D-CAP+ control architecture, which enables fast transient response with low output capacitance, and OSR (oversampled ripple regulation) for tight regulation with low-ESR output capacitors. The PCNT pin allows selection between dual-phase and single-phase operation, optimizing light-load efficiency versus full-load capability. An integrated 8-bit DAC sets the output voltage digitally, and TI Eco-mode supports high efficiency at light loads.
Technically, the dual-phase topology interleaves two switching phases, reducing input and output ripple current, allowing smaller passives, and spreading thermal dissipation across two MOSFET pairs. With integrated drivers, the part eliminates external driver ICs, shortening the gate loop and improving switching behavior. Output voltage, current limit, and switching behavior are programmed via pin straps and the voltage DAC, minimizing external component count.
Typical applications include CPU and ASIC core power rails, DDR memory VDDQ supplies, network switch and router POL rails, and distributed 12V bus point-of-load conversion where a controller plus discrete FETs offers the best cost-per-amp.
Design tip: keep the gate-drive loops short to the integrated drivers, size the inductor per datasheet recommendations, and use PCNT phase selection deliberately - single-phase saves quiescent power at light loads but doubles per-phase current stress at peak load.
Drop-in alternatives for TPS53624 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TPS53624 (same form factor and footprint) — differing in Operating Temperature, Package, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS53622RSBT
⚡ Same Package✓ In Stock
$3.96 / Unit
View Datasheet →TPS53632
⚡ Same Package✓ In Stock
$4.6 / Unit
View Datasheet →TPS53315
⚡ Same Package✓ In Stock
$3.52 / Unit
View Datasheet →TPS53679
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
NCP81208
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS53624 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck, Step-Down Controller |
| Number of Phases | 1 or 2 (selectable via PCNT pin) |
| Control Architecture | D-CAP+ with OSR |
| Gate Drivers | Integrated |
| Output Voltage Setting | 8-Bit DAC |
| Light Load Mode | Eco-mode |
| Package | 40-VQFN (6x6 mm), thermally enhanced |
| Operating Temperature | -10C to +105C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Output Type | Positive output |
TPS53624 Pin Configuration
| Pin 1 | PGD1 — Phase 1 power good indicator [verify against datasheet pin map] |
| Pin PCNT | PCNT — Phase count select - dual or single phase mode |
| Pin VBOOT | VBOOT — Boot voltage strap for 8-bit DAC setting |
| Pin BST1 | BST1 — Phase 1 high-side driver bootstrap |
| Pin DRH1 | DRH1 — Phase 1 high-side gate drive |
| Pin PH1 | PH1 — Phase 1 switch node / driver return |
| Pin DRL1 | DRL1 — Phase 1 low-side gate drive |
| Pin BST2 | BST2 — Phase 2 high-side driver bootstrap |
| Pin DRH2 | DRH2 — Phase 2 high-side gate drive |
| Pin PH2 | PH2 — Phase 2 switch node / driver return |
| Pin DRL2 | DRL2 — Phase 2 low-side gate drive |
| Pin VCC | VCC — Controller supply voltage |
| Pin GND | GND — Ground reference |
| Pin FB | FB — Output voltage feedback sense |
Typical Applications
TPS53624 is suitable for 6 applications: CPU and ASIC Core Power Rails, DDR Memory VDDQ Supply, Network Switch and Router Point-of-Load, Data Center Server POL Conversion, Telecom and Base Station Power, Industrial Automation Controller Power.
CPU and ASIC Core Power Rails
The TPS53624 fits core power conversion for CPUs, network processors, and ASICs because its dual-phase D-CAP+ architecture handles fast load steps from idle to full compute. The 8-bit DAC sets common core voltages, and PCNT-based phase selection lets a single design serve multiple SKUs: single-phase for low-power SKUs, dual-phase for peak-current parts. Integrated gate drivers shorten gate loops versus external-driver designs, improving switching edge control. Place the converter near the load with low-inductance bulk and ceramic capacitance to meet transient droop targets.
Recommended
DDR Memory VDDQ Supply
DDR3/DDR4 VDDQ rails demand tight DC accuracy and fast transient response on bursty memory traffic. The TPS53624's OSR-enabled D-CAP+ loop responds within microseconds to memory activation load steps, while the 8-bit DAC programs typical 1.2V/1.35V VDDQ setpoints accurately. Eco-mode maintains efficiency during self-refresh idle periods. Single-phase mode via PCNT suits one DIMM-channel rails; dual-phase supports higher-capacity servers with many DIMMs sharing a rail, halving ripple per phase and shrinking output capacitance.
Recommended
Network Switch and Router Point-of-Load
Enterprise switch line cards and router control planes convert a 12V intermediate bus to multiple low-voltage rails. The TPS53624 provides controller-level flexibility: discrete MOSFETs scale output current per rail, and the -10C to 105C operating range withstands elevated card ambient temperatures. D-CAP+ transient response handles traffic-driven load spikes without large bulk capacitor banks, cutting BOM cost. The 40-VQFN 6x6 footprint fits dense card layouts, and integrated drivers remove separate driver ICs from the design.
Recommended
Data Center Server POL Conversion
Server motherboards convert 12V distributed power to numerous core, SOC, and memory rails. The TPS53624 serves mid-current POL rails where a controller plus discrete FETs beats integrated modules on cost-per-amp and thermal spreading. Dual-phase interleaving halves input ripple current, reducing input capacitor stress, and spreads dissipation across two FET locations for easier heatsinking. Eco-mode meets server energy-efficiency targets at idle, and the thermally enhanced VQFN power pad simplifies thermal design on thick-copper server PCBs.
Recommended
Telecom and Base Station Power
Telecom equipment running from -48V-derived 12V intermediate buses uses point-of-load controllers like the TPS53624 for DSP and FPGA core rails. Its wide -10C to 105C rating covers outdoor and shelf-mounted equipment ambients, and the D-CAP+ loop's fast response protects processors during burst transmission loads. The 8-bit DAC enables firmware-adjacent voltage margining via pin straps in production. Dual-phase mode supports higher-current FPGA core rails, while PCNT-configured single-phase mode powers I/O rails efficiently.
Recommended
Industrial Automation Controller Power
PLCs, motor-control cards, and industrial PCs require robust 12V-to-core conversion with wide temperature tolerance. The TPS53624's -10C to 105C range and RoHS-compliant thermally enhanced 40-VQFN package withstand industrial cabinets. Its controller architecture allows conservative MOSFET derating for high-reliability deployments, while the D-CAP+ loop remains stable with ceramic output capacitors that resist aging in vibration-prone environments. The PCNT phase-select pin allows one PCB to serve multiple product tiers via a single strap change.
Recommended
Recommended Products Summary
Engineering reference data for TPS53624 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS53622 | TPS53632 | TPS53315 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Control Architecture | D-CAP+ with OSR | D-CAP+ | D-CAP+ | D-CAP+ |
| Light Load Efficiency Mode | Eco-mode | Eco-mode | Eco-mode | Eco-mode |
| RoHS | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- PCNT pin enables single- or dual-phase operation on one PCB (vs TPS53315)
- OSR-enhanced D-CAP+ enables lower output capacitance (vs TPS53632)
- Integrated gate drivers eliminate external driver ICs (vs NCP81208)
Design Notes
Because the TPS53624 integrates the gate drivers, keep DRH/PH/DRL traces short and wide (minimum 20 mil for gate traces) to minimize gate loop inductance and ringing. Place bootstrap capacitors within 2 mm of BST-to-PH pins. Route the output voltage feedback sense line as a Kelvin trace from the output capacitor, away from switch nodes, per TI datasheet layout guidelines.
Output current is set entirely by the external MOSFETs and inductor - the controller itself does not limit current capability. Select FETs whose RDS(on) and gate charge match the D-CAP+ adaptive on-time range, and verify per-phase RMS current in single-phase PCNT mode, where one phase carries the full load. Derate inductor saturation current at maximum ambient temperature.
Verify the 8-bit DAC boot voltage table against your rail requirement before locking the design - incorrect VBOOT strapping produces the wrong output at power-up. When switching between single- and dual-phase mode via PCNT, both current limit and ripple behavior change; re-validate transient response in the final mode. Do not omit the PH snubber review if switch-node ringing exceeds FET ratings.
The thermally enhanced 40-VQFN (6x6 mm) power pad must be soldered to a copper pour with multiple thermal vias (9-16 vias of 0.3 mm) to the ground plane. Driver losses plus controller quiescent power concentrate at this pad; inadequate via arrays raise junction temperature, especially in single-phase high-current operation where one driver set dissipates more.
Compliance Information
TI product page states the TPS53624 is packaged in a RoHS-compliant 40-pin QFN. REACH, lead-free, and halogen-free declarations must be confirmed on the TI product page for the specific ordering suffix.
