TPS561201DDCR - 17V 1A Synchronous Buck | Texas Instruments
MPN: TPS561201DDCR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.5 | $5.00 |
| 100 | $0.4 | $40.00 |
| 500 | $0.33 | $165.00 |
| 1,000 | $0.29 | $290.00 |
TPS561201DDCR Overview
A synchronous step-down voltage regulator is a DC-DC converter that uses two actively controlled switches (high-side and low-side MOSFETs) to efficiently lower a higher DC voltage to a lower regulated voltage. Unlike asynchronous regulators, the low-side switch replaces the freewheeling Schottky diode, reducing conduction losses and improving efficiency. This converter belongs to the broader family of switch-mode power supplies (SMPS) within power management ICs.
Key features include D-CAP2 control, which simplifies loop compensation by requiring only a low-ESR ceramic output capacitor for stable operation. The device has an enable pin for power sequencing, fixed soft start to limit inrush current, and pulse skip mode for light-load efficiency. The quiescent current is only 0.4mA typical, contributing to high light-load efficiency.
The device integrates a synchronous rectifier, eliminating an external Schottky diode and reducing board area. Internal cycle-by-cycle current limit and thermal shutdown protect the IC. The fixed 580kHz switching frequency offers a balanced trade-off between efficiency and component size, enabling small inductors and output capacitors. D-CAP2 mode also provides fast transient response, making it suitable for processors and FPGAs with dynamic loads.
Typical applications include set-top boxes, smart TVs, networking equipment, industrial control systems, white goods, and battery-powered devices. On a 12V industrial bus, it can produce clean 3.3V or 5V rails for MCUs and I/O. The enable pin supports power sequencing in multi-rail systems.
When designing with this part, use approximately 10uF input and 22uF output capacitance placed close to the device. Because the SOT-23 package is small, pay careful attention to thermal dissipation; at higher power loss a larger copper area is necessary to keep the junction temperature within the -40C to +125C range.
Drop-in alternatives for TPS561201DDCR — 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 TPS561201DDCR (same form factor and footprint) — differing in Output Voltage Range, Package, Input Voltage Range, Maximum Output Current, Light Load Mode.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS562201DDCT
✅ Drop-In✓ In Stock
$0.45 / Unit
View Datasheet →TPS563207DRLR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.31 / Unit
View Datasheet →TPS54202DDCR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.12 / Unit
View Datasheet →TPS561201DDCT
✅ Drop-In📋 Reference alternative (not in catalog)
RT7276GJ5
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS561201DDCR Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Step-Down (Buck) |
| Input Voltage Range | 4.5 V to 17 V |
| Output Voltage Range | 0.76 V to 7 V (adjustable) |
| Maximum Output Current | 1 A |
| Switching Frequency | 580 kHz (fixed) |
| Control Mode | D-CAP2 |
| Quiescent Current | 0.4 mA (typ) |
| Operating Temperature | -40C to +125C |
| Package | SOT-23-THN (DDC), 6 pins |
| Package Dimensions | 2.9 mm x 1.6 mm |
| Mounting Type | Surface Mount |
| Features | Enable, Light Load Efficiency, Soft Start Fixed, Synchronous |
| Light Load Mode | Pulse Skip |
| Protections | Current limit, thermal shutdown |
| MSL Level | 1 (260C unlimited) |
| RoHS Status | Compliant |
TPS561201DDCR Pin Configuration
| Pin 1 | BOOT — Bootstrap for high-side gate driver, connect capacitor to SW |
| Pin 2 | GND — Ground reference |
| Pin 3 | FB — Feedback input from output resistor divider (0.76V reference) |
| Pin 4 | EN — Enable input, high = device enabled |
| Pin 5 | SW — Switch node, connect output inductor |
| Pin 6 | VIN — Input supply, 4.5V to 17V |
Typical Applications
TPS561201DDCR is suitable for 6 applications: Set-Top Boxes and Smart TVs, Networking Equipment, Industrial Control Systems, White Goods and Appliances, Battery-Powered and Portable Devices, 5V and 12V Adapter-Fed Peripherals.
Set-Top Boxes and Smart TVs
The TPS561201DDCR converts 12V adapter inputs to 3.3V or 1.2V rails for SoC, memory, and tuner blocks in set-top boxes and smart TVs. Its D-CAP2 control delivers fast transient response for SoC core rails with dynamic load steps, while pulse-skip mode keeps efficiency high during standby, meeting low no-load power targets. The tiny 2.9mm x 1.6mm SOT-23-6 package and 580kHz switching allow a compact, low-cost BOM with only about 10uF input and 22uF output capacitance.
Recommended
Networking Equipment
In routers, switches, and access points running from 12V backplane power, the TPS561201DDCR provides efficient 1A point-of-load rails for MCUs, PHYs, and I/O logic. The fixed 580kHz frequency keeps magnetics small for dense boards, and the integrated synchronous rectifier removes the external Schottky diode, improving efficiency above 85% at typical loads. The EN pin supports sequenced power-up across multiple rails, and internal current limit plus thermal shutdown protect against shorts on field-deployed hardware.
Recommended
Industrial Control Systems
For PLC I/O modules and factory automation boards fed from 12V industrial buses, the TPS561201DDCR supplies 3.3V or 5V logic rails with a -40C to +125C operating range suited to harsh cabinets. D-CAP2 stability with low-ESR ceramic output capacitors simplifies qualification across production tolerance spreads. The enable pin enables rail sequencing for processors, and the 1A rating covers typical MCU plus sensor loads; the 17V input ceiling must be observed on nominal 24V systems, which require a wider-input device instead.
Recommended
White Goods and Appliances
Smart appliance controller boards use the TPS561201DDCR to step 12V auxiliary supplies down to MCU and display rails. The wide -40C to +125C junction range tolerates hot enclosures near motors and cold storage environments, while pulse-skip light-load mode reduces standby draw to meet energy regulations. The low external component count (single inductor plus about 32uF total ceramic capacitance) and low-cost SOT-23-6 package fit high-volume appliance BOMs where reliability and cost dominate design choices.
Recommended
Battery-Powered and Portable Devices
The TPS561201DDCR suits 2S-4S battery packs and 5V/12V adapter-fed portable equipment needing a compact 1A buck. Its 0.4mA typical quiescent current and pulse-skip mode preserve battery life at light load, while D-CAP2 control gives fast transient response for burst-mode SoCs and wireless modules. The 2.9mm x 1.6mm SOT-23-6 footprint and minimal external parts fit space-limited handheld PCBs; designers should place the EN pin under MCU control for complete system power gating during sleep states.
Recommended
5V and 12V Adapter-Fed Peripherals
External drives, camera modules, and desktop peripherals use the TPS561201DDCR for local 3.3V, 2.5V, or 1.8V generation from a single 5V or 12V supply. With only 0.76V minimum output, it also supports low-voltage core rails via a resistor divider on FB. The fixed soft start limits inrush current on hot-plug connectors, and cycle-by-cycle current limit handles shorted cables. At 12V input and 1A output the device dissipates modest power thanks to synchronous rectification, but copper pour under the DDC package remains advisable.
Recommended
Recommended Products Summary
Engineering reference data for TPS561201DDCR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS562201DDCT | TPS563207DRLR | TPS54202DDCR | RT7276GJ5 |
|---|---|---|---|---|---|
| Package | SOT-23-6 (DDC) | SOT-23-6 (DDC) - same | SOT-23-6 (DRL) - same family footprint | SOT-23-6 (DDC) - same | SOT-23-6 - same outline, verify pinout |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Richtek |
| Max Output Current | 1 A | 2 A | 3 A | 2 A | 2 A |
| Input Voltage Range | 4.5V to 17V | 4.5V to 17V | 4.5V to 17V | 4.5V to 28V | 4.5V to 24V |
| Output Voltage Range | 0.76V to 7V | 0.6V to 7V | 0.6V to 7V | 0.6V to 28V (max duty limited) | 0.765V to 5V |
| Control Mode | D-CAP2 | D-CAP2 | D-CAP2 | ECOT | ACOT |
Key Differentiators
- Lowest quiescent current in family at 0.4mA typ (vs TPS563207DRLR)
- D-CAP2 control with ceramic-capacitor-only stability (vs TPS54202DDCR)
- Cost-optimized 1A rating for low-power rails (vs TPS562201DDCT)
Design Notes
Keep the power loop (VIN capacitor, VIN pin, SW pin, inductor, output capacitor, GND) as tight as possible. Place the 10uF input ceramic capacitor within 2-3mm of the VIN pin and the 22uF output capacitor close to the inductor. Connect the BOOT-SW bootstrap capacitor (0.1uF) directly across pins 1 and 5 with short traces. Use a solid ground pour under the DDC package for thermal relief.
The SOT-23-6 (DDC) package is small with limited power dissipation capability. At VIN=12V, VOUT=3.3V, 1A load, losses are roughly 0.8-1W at 580kHz including switching and conduction losses; without adequate copper pour the junction can exceed +125C. Provide at least 1 square inch of 1oz copper connected to GND, and derate output current in high ambient temperature enclosures.
Do not exceed 17V input; nominal 24V industrial buses require the TPS54202 (28V) instead. The minimum on-time of D-CAP2 control limits maximum step-down ratio at 17V input - very low outputs such as 1V at 17V input may force pulse skipping rather than clean 580kHz operation. Use 1% tolerance FB divider resistors and keep the FB trace away from the SW node to avoid noise coupling.
Route the FB divider sense trace from the output capacitor, not from the inductor switch node, to maintain accurate regulation. Keep the EN pin pull-down (if used for default-off) close to pin 4. For multi-rail sequencing, drive EN from another rail via a resistor divider so the TPS561201DDCR starts only after its upstream rail is stable.
Compliance Information
RoHS compliant and MSL 1 (260C unlimited) per PartGenie compliance notes. AEC-Q100 qualification not stated in provided data.
