TPS54120 - Low-Noise 1A Power Supply with Integrated DC-DC + LDO | TI
MPN: TPS54120 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.95 | $4.95 |
| 10 | $4.45 | $44.50 |
| 100 | $3.95 | $395.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.15 | $3,150.00 |
Drop-in alternatives for TPS54120 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS54120RGYR
β Drop-Inπ Reference alternative (not in catalog)
TPS54120RGYT
β Drop-Inπ Reference alternative (not in catalog)
TPS62912
β Drop-Inπ Reference alternative (not in catalog)
TPS5420
β Drop-Inπ Reference alternative (not in catalog)
LTC3372EUH#PBF
β Drop-Inβ In Stock
$8.1 / Unit
View Datasheet βTPS54120 Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Output Current | 1 A |
| Input Voltage Range | 4.5 V to 17 V |
| Switching Frequency | 200 kHz to 1.2 MHz |
| Number of Outputs | 2 (1 Buck, 1 LDO) |
| Package | 24-VQFN (5.5x3.5 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Soft-Start | Yes |
| Switching Frequency Synchronization | Yes |
| Power Good | Yes |
| Overcurrent Protection | Yes |
| Output Discharge | Yes |
| Spread-Spectrum Clocking | Yes |
| UVLO | Fixed |
| RoHS Status | Compliant |
TPS54120 Pin Configuration
| Pin 1 | VIN β Input supply voltage |
| Pin 2 | GND β Ground |
| Pin 3 | SW β Switching node of DC-DC converter |
| Pin 4 | BST β Bootstrap capacitor connection |
| Pin 5 | EN β Enable pin |
| Pin 6 | RT β Switching frequency timing resistor |
| Pin 7 | SYNC β External clock synchronization input |
| Pin 8 | SS β Soft-start timing capacitor |
| Pin 9 | COMP β Compensation network |
| Pin 10 | FB β Feedback for DC-DC converter |
| Pin 11 | PG β Power good output |
| Pin 12 | LDO_IN β LDO input supply |
| Pin 13 | LDO_OUT β LDO output |
| Pin 14 | LDO_FB β LDO feedback |
| Pin 15 | GND β Ground |
| Pin 16 | PAD β Exposed thermal pad |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS54120 is suitable for 6 applications: Telecom Infrastructure, Pico and Femto Base Stations, Powering Sensitive Clocking Distribution, RF Power Supply, Industrial Test Equipment, Data Converter Power.
Telecom Infrastructure
The TPS54120 provides a low-noise power supply for telecom equipment, ensuring clean power rails for sensitive communication circuits. Its wide input range of 4.5V to 17V accommodates 12V buses, and the integrated LDO suppresses switching noise, making it ideal for powering PLLs and VCOs in base stations. The device's high PSR and low output noise help maintain signal integrity in high-frequency communication systems.
Recommended
Pico and Femto Base Stations
In small-cell base stations, the TPS54120 delivers a clean, low-noise supply to RF transceivers and baseband processors. The integrated DC-DC converter provides high efficiency, while the LDO ensures low noise for sensitive analog circuits. The device's small VQFN package saves board space, and its switching frequency synchronization helps manage EMI in dense RF environments. This makes it an excellent choice for compact, high-performance wireless infrastructure.
Recommended
Powering Sensitive Clocking Distribution
The TPS54120 is ideal for powering clock distribution circuits, where noise on the power rail can cause jitter and phase noise. Its ultra-low-noise output, achieved through the integrated LDO, ensures clean power to PLLs and clock buffers. The device's wide input range and adjustable output voltage allow flexibility in various clocking architectures. The soft-start feature prevents inrush current during power-up, protecting sensitive clocking ICs.
Recommended
RF Power Supply
The TPS54120 provides a low-noise supply for RF circuits, such as VCOs and mixers, where power supply noise directly affects phase noise and spurious performance. The integrated LDO offers high PSR, suppressing switching noise from the DC-DC converter. The device's wide input range supports various system voltages, and its compact package is suitable for RF modules. The spread-spectrum clocking feature further reduces EMI, making it ideal for RF applications.
Recommended
Industrial Test Equipment
In industrial test and measurement equipment, the TPS54120 ensures accurate measurements by providing a low-noise power supply to ADCs, DACs, and precision amplifiers. The device's high PSR and low output noise minimize interference in sensitive analog circuits. Its wide input range and adjustable output make it versatile for various test setups. The integrated DC-DC converter improves efficiency, reducing heat in enclosed instruments.
Recommended
Data Converter Power
The TPS54120 is well-suited for powering high-speed data converters, where power supply noise can degrade SNR and ENOB. The integrated LDO provides a clean, low-noise rail to the converter's analog supply pins, while the DC-DC converter efficiently steps down the input voltage. The device's low output noise and high PSR ensure optimal converter performance. Its compact package and adjustable output voltage make it easy to integrate into converter designs.
Recommended
Recommended Products Summary
Engineering reference data for TPS54120 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS54120RGYR | TPS54120RGYT | TPS62912 | TPS5420 | LTC3372EUH#PBF |
|---|---|---|---|---|---|---|
| Package | 24-VQFN (5.5x3.5 mm) | 24-VQFN (5.5x3.5 mm) - same | 24-VQFN (5.5x3.5 mm) - same | 24-VQFN (5.5x3.5 mm) - same | 24-VQFN (5.5x3.5 mm) - same | 24-VQFN (5.5x3.5 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Output Current | 1 A | 1 A | 1 A | 1 A | 0.5 A | 1 A per channel |
| Input Voltage Range | 4.5V to 17V | 4.5V to 17V | 4.5V to 17V | 4.5V to 17V | 5.5V to 36V | 2.7V to 5.5V |
| Integrated LDO | Yes | Yes | Yes | No | No | No |
| Switching Frequency | 200kHz to 1.2MHz | 200kHz to 1.2MHz | 200kHz to 1.2MHz | 200kHz to 2.2MHz | 500kHz | 1MHz to 3MHz |
| Soft-Start | Yes | Yes | Yes | Yes | Yes | Yes |
| Power Good | Yes | Yes | Yes | Yes | No | Yes |
Key Differentiators
- Integrated DC-DC converter and LDO in one package (vs TPS62912)
- Wide input voltage range of 4.5V to 17V (vs LTC3372EUH#PBF)
- Switching frequency synchronization (vs TPS5420)
Design Notes
Place input and output capacitors close to the TPS54120 pins to minimize parasitic inductance. Use a 10uF ceramic capacitor on the input and a 22uF ceramic capacitor on the LDO output. Ensure the switching node (SW) has a short, wide trace to reduce EMI.
The TPS54120's power dissipation depends on the DC-DC converter efficiency and LDO dropout. For high input-to-output voltage differences, the LDO may dissipate significant power. Use the exposed thermal pad (PAD) connected to a large copper area on the PCB to improve heat dissipation. Consider thermal vias for better thermal performance.
Do not exceed the maximum input voltage of 17V. Ensure the feedback resistors for the LDO are selected to set the desired output voltage within the adjustable range. The soft-start capacitor should be sized to prevent inrush current, and the SYNC pin should be tied to ground if not used to avoid noise.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
