TPS40171RGYR - 60V Wide-Input Sync Buck Controller | Texas Instruments
N.º da peça: TPS40171RGYR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.78 | $3,78 |
| 10 | $3.41 | $34,10 |
| 100 | $3.04 | $304,00 |
| 500 | $2.74 | $1.370,00 |
| 1.000 | $2.43 | $2.430,00 |
TPS40171RGYR Visão geral
A buck controller is a type of switching-mode DC-DC controller that regulates a lower output voltage from a higher input voltage using an inductor as the energy-storage element. Within the power management hierarchy, it sits between a DC-DC converter and a switching regulator; the term "controller" specifically denotes that the device only provides gate-drive signals and does not include the power MOSFETs internally, allowing the designer to size external switches for the application current. Synchronous buck controllers replace the traditional diode with a low-side MOSFET to achieve higher efficiency, particularly at high load currents.
Key features include 4.5-V to 60-V input range, 0.6-V to ~0.85*VIN adjustable output, programmable current-mode control with internal slope compensation, selectable between voltage-mode (VMC) and average-current-mode (ACM) control architectures, and a precision enable input with adjustable undervoltage lockout. The TPS40171 also integrates programmable soft-start, cycle-by-cycle current limiting, hiccup overload protection, and a power-good indicator for supply sequencing. Thermal performance is rated for a junction-to-ambient resistance of approximately 35 C/W on a standard JEDEC 4-layer board.
Architecturally, the TPS40171 uses peak current-mode control with an internal transconductance error amplifier, providing excellent line rejection and simplified loop compensation. The MODE pin selects between voltage-mode (D-CAP-style) and current-mode operation; current-mode offers better transient response and paralleled-rail capability. Internal logic-level translation enables 100% duty-cycle operation for cold-crank survival in 12-V automotive systems. The TPS40171 is the higher-frequency (up to 600 kHz) sibling of the TPS40170 (up to 300 kHz), allowing the use of smaller external inductors and capacitors where efficiency trade-offs are acceptable.
Typical applications include industrial 24-V and 48-V distributed-bus point-of-load regulators, telecom base-station intermediate bus converters, 12-V automotive infotainment and body-electronics rails, battery-powered test and measurement equipment, and any POL supply requiring high step-down ratios with high efficiency. The wide input range also supports USB-PD and e-mobility auxiliary rails.
When designing with this device, choose the TPS40170 (300 kHz max) variant when lower switching loss in large power stages is critical, and choose TPS40171 when smaller magnetics and faster transient response are required. Always size the bootstrap capacitor for the high-side gate drive and place the input bypass capacitors as close as possible to the power-stage switching node to minimize parasitic ringing. According to the TI datasheet, the maximum operating junction temperature is +125 C and the part is rated for -40 C to +125 C ambient operation.
This page synthesizes distributor pricing, drop-in alternatives within the same VQFN-20 footprint, and practical design notes not found in the manufacturer datasheet.
Alternativas drop-in para TPS40171RGYR — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com TPS40171RGYR (mesmo formato e footprint) — diferindo em Package, Output Voltage Range, Topology, Dead-Time Control, MSL Level.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
TPS40170RGYR
✅ Drop-In✓ Em estoque
$1.45 / unidade
Ver ficha técnica →TPS40170QRGYRQ1
✅ Drop-In✓ Em estoque
$3.85 / unidade
Ver ficha técnica →TPS40171RGYT
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
TPS40173RGYR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS40171RGYR Classificações máximas e características elétricas
| Topologia | Synchronous Buck Controller |
| Faixa de tensão de entrada | 4.5 V to 60 V |
| Faixa de tensão de saída | 0.6 V to ~0.85 * VIN |
| Tensão de referência | 0.6 V (internal) |
| Frequência de comutação | 100 kHz to 600 kHz (programmable) |
| Control Architecture | Peak current-mode with selectable voltage-mode / average-current-mode |
| Duty Cycle | Up to 100% (high-side) / 0% to 100% |
| Número de saídas | 1 |
| Driver Type | External N-channel high-side + low-side MOSFETs |
| Soft-start | Programmable, internal SS capacitor charging |
| Limitação de corrente | Cycle-by-cycle, hiccup mode overload protection |
| Saída Power Good | Yes (open-drain) |
| Enable Input | Yes (precision, with adjustable UVLO) |
| Temperatura de operação | -40 C to +125 C |
| Encapsulamento | 20-pin VQFN (RGY) 3.5 x 4.5 mm with thermal pad |
| Tipo de montagem | Surface Mount |
| Nível MSL | 2 (1 year floor life) |
| Status RoHS | Compliant |
Configuração de pinos do TPS40171RGYR
| Pino 1 | BST — Bootstrap capacitor connection for high-side gate driver |
| Pino 2 | VIN — Input voltage supply (4.5 V to 60 V) |
| Pino 3 | VIN — Input voltage supply (4.5 V to 60 V) |
| Pino 4 | EN — Precision enable input with adjustable UVLO |
| Pino 5 | RT/SS — Frequency set resistor and soft-start capacitor |
| Pino 6 | VREF — Internal 5 V reference output |
| Pino 7 | FB — Voltage feedback (internal reference 0.6 V) |
| Pino 8 | COMP — Error amplifier output / loop compensation |
| Pino 9 | PGOOD — Power-good indicator (open-drain) |
| Pino 10 | MODE — Control mode select (VMC / ACM / DCM) |
| Pino 11 | ILIM — Current limit set resistor |
| Pino 12 | GND — Analog ground |
| Pino 13 | LG — Low-side gate driver output |
| Pino 14 | SW — Switching node (low-side FET source) |
| Pino 15 | SW — Switching node (low-side FET source) |
| Pino 16 | HG — High-side gate driver output |
| Pino 17 | BST — Bootstrap capacitor connection (duplicate of pin 1) |
| Pino 18 | UVLO — Undervoltage lockout programming |
| Pino 19 | VIN — Input voltage supply (4.5 V to 60 V) |
| Pino 20 | PAD — Thermal pad (connect to GND) |
Aplicações típicas
TPS40171RGYR é adequado para 6 aplicaçãos: Industrial 24V/48V Point-of-Load Regulators, Telecom Base-Station Intermediate Bus Converters, Automotive 12V Body Electronics and Infotainment Rails, Battery-Powered Test and Measurement Equipment, USB-PD and High-Power Charging Adapters, E-Mobility Auxiliary and E-Bike Battery Rails.
Industrial 24V/48V Point-of-Load Regulators
The TPS40171RGYR is well matched to industrial 24 V and 48 V distributed-bus point-of-load (POL) regulators because its 4.5 V to 60 V input range covers the full industrial bus envelope including transient overshoot. Programmable switching up to 600 kHz allows the use of compact 4.7 uH to 10 uH power inductors while delivering 5 A to 15 A downstream rails at 3.3 V, 2.5 V, or 1.8 V. Cycle-by-cycle current limit with hiccup protects downstream FPGAs or MCUs from short-circuit events, while the open-drain power-good output simplifies supply sequencing in multi-rail PLC or industrial-controller designs. Estimated efficiency at VIN = 24 V, VOUT = 3.3 V, IOUT = 10 A approaches 95% with appropriately sized external MOSFETs.
Recomendado
Telecom Base-Station Intermediate Bus Converters
In telecom base stations, the TPS40171RGYR serves as a 48 V to 12 V or 48 V to 5 V intermediate bus converter feeding downstream point-of-load regulators that power DSPs, FPGAs, and network processors. Its peak current-mode control with optional average-current-mode provides excellent line-rejection of upstream ripple on the 48 V bus, and the precision enable pin with adjustable UVLO prevents false start-up during input transients. The wide input range also tolerates telecom battery-plant dips to 36 V during recharge cycles. For a 48 V to 5 V at 8 A design running at 500 kHz, the TPS40171 enables a 4.7 uH inductor versus 10 uH at 300 kHz, reducing magnetic footprint by roughly 40%.
Recomendado
Automotive 12V Body Electronics and Infotainment Rails
The TPS40171RGYR (or its TPS40171-Q1 automotive equivalent) is widely used to derive 3.3 V, 1.8 V, and 1.2 V rails for automotive infotainment head units, instrument clusters, and ADAS sensor modules. The 4.5 V to 60 V input range covers automotive cold-crank (down to 4.5 V) and 12 V load-dump transients (up to ~40 V after external TVS clamping). The TPS40171's 100% maximum duty-cycle capability is essential for maintaining regulation during crank dips. Hiccup-mode overload protection prevents nuisance shutdowns during inrush events such as USB-PD hot-plug on adjacent ports. For an automotive 12 V to 1.2 V at 6 A design at 500 kHz, the part achieves roughly 90% efficiency with dual N-FET power stages.
Recomendado
Battery-Powered Test and Measurement Equipment
Portable test and measurement instruments benefit from the TPS40171RGYR's wide input range, which allows direct operation from 4-cell Li-ion battery packs (nominal 14.4 V, max 16.8 V) without a pre-regulator. The synchronous topology delivers >93% efficiency at 5 A loads, extending battery runtime, and the precision enable allows the microcontroller to gate power with microamp quiescent draw when the device is disabled. The exposed thermal pad of the VQFN-20 package dissipates 2-3 W comfortably on 2 oz copper pours in hand-held enclosures. Per the TI datasheet, the internal reference accuracy of 1% over -40 C to +125 C is sufficient for most ADC and DAC reference rails without external buffering.
Recomendado
USB-PD and High-Power Charging Adapters
USB-PD adapters and high-power charging hubs use the TPS40171RGYR as a secondary-side buck regulator after the PFC and flyback stages to provide 5 V, 9 V, 15 V, or 20 V outputs at 3-5 A. Its 60 V absolute maximum input handles PFC output overshoot during AC transients, and the cycle-by-cycle current limit plus hiccup provides robust short-circuit protection for the USB-C cable and connected devices. The programmable soft-start, set by the RT/SS capacitor, controls inrush to satisfy USB-PD turn-on timing. For a USB-PD 20 V at 5 A design at 400 kHz, the TPS40171 typically achieves 96% efficiency with synchronous N-FETs.
Recomendado
E-Mobility Auxiliary and E-Bike Battery Rails
E-bikes, e-scooters, and other light e-mobility vehicles use 36 V or 48 V battery packs that exceed the 60 V rating of the TPS40171RGYR after a fully-charged lithium pack plus transient overshoot. The TPS40171's 60 V input comfortably accepts a 13S Li-ion pack (max 54.6 V) and supports auxiliary 12 V rails for lighting, displays, and motor-controller housekeeping. The synchronous buck topology outperforms linear regulators at these high step-down ratios, achieving 95%+ efficiency and minimizing heat in enclosed battery housings. According to TI application notes, the exposed thermal pad of the VQFN-20 package provides sufficient cooling for 5-7 W continuous dissipation with appropriate copper area.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para TPS40171RGYR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | TPS40170RGYR | TPS40170QRGYRQ1 | TPS40171RGYT | TPS40173RGYR |
|---|---|---|---|---|---|
| Package | VQFN-20 (RGY) 3.5x4.5 mm | VQFN-20 (RGY) 3.5x4.5 mm - same | VQFN-20 (RGY) 3.5x4.5 mm - same | VQFN-20 (RGY) 3.5x4.5 mm - same | VQFN-20 (RGY) 3.5x4.5 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Max Switching Frequency | 600 kHz | 300 kHz (-50%) | 300 kHz (-50%) | 600 kHz (same) | 600 kHz (same) |
| Input Voltage Range | 4.5 V to 60 V | 4.5 V to 60 V (same) | 4.5 V to 60 V (same) | 4.5 V to 60 V (same) | 4.5 V to 60 V (same) |
| AEC-Q100 Qualified | No | No | Yes | No | Yes |
| Control Architecture | Peak CMC + VMC + ACM selectable | Peak CMC + VMC + ACM selectable (same) | Peak CMC + VMC + ACM selectable (same) | Peak CMC + VMC + ACM selectable (same) | Peak CMC + VMC + ACM selectable (same) |
| Power Good Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Approx. Unit Price (qty 1) | $3.78 | $3.50 (approx, lower FSW tier) | $4.20 (approx, automotive) | $3.78 (same, reel variant) | $4.30 (approx, automotive) |
Principais diferenciais
- Up to 600 kHz switching frequency reduces magnetic size (vs TPS40170RGYR)
- Selectable voltage-mode / peak CMC / average-current-mode control (vs TPS40170RGYR)
- Drop-in footprint with automotive-grade sibling (TPS40173RGYR) (vs TPS40173RGYR)
Notas de projeto
Place the input ceramic bypass capacitors (typically 2x 4.7 uF X7R 100 V) directly between VIN pins and the GND thermal pad with the shortest possible loop. Keep the high-current switching-node copper (SW) as small as practical to minimize radiated EMI; the exposed thermal pad must be soldered to a continuous ground plane with multiple thermal vias for adequate heat extraction. Per the TI TPS40171 datasheet, the BST capacitor (typically 0.1 uF) should be placed within 3 mm of the BST and SW pins to ensure reliable high-side gate drive.
Route the FB trace away from the SW node and HG/LG gate-drive traces to avoid capacitive coupling that introduces jitter on the feedback path. Use a Kelvin connection to the output voltage sense point at the load, not at the inductor output, to compensate for IR drop in the PCB traces. The COMP node is sensitive to noise; surround it with a ground guard ring and place the loop compensation components (R-C-R) within 5 mm of the COMP pin. Estimated: keeping FB trace length below 10 mm and surrounding it with ground copper typically reduces output ripple by 10-20 mV peak-to-peak.
Although the TPS40171 is a controller (low dissipation), the external MOSFETs dominate the thermal budget. Sized for a 5 V / 10 A output, total power loss in the high-side + low-side FETs is approximately 0.7 W at 95% efficiency. Allocate at least 1 square inch of 2 oz copper on each layer connected to the FET drains/sources to keep junction temperature below 100 C in a still-air 25 C ambient. Estimated: at 0.7 W loss with 50 C/W combined thermal resistance, junction rise is 35 C, leaving adequate margin to the 125 C rating.
Do not omit the BST-to-SW bootstrap capacitor; without it the high-side FET will not turn on and the regulator will fail to start. Do not use ceramic capacitors with voltage derating below 50% of VIN on the input bulk capacitor, as automotive load-dump transients can exceed 40 V. Per TI application notes, the SS capacitor must be selected for the desired soft-start time using the formula tSS = C_SS * VREF / 10 uA; values below 1 nF can cause false hiccup events during startup.
Informações de conformidade
TPS40171RGYR is RoHS compliant per the TI product page. The part is NOT AEC-Q100 qualified; for automotive applications select TPS40171-Q1 or TPS40173RGYR. The exposed thermal pad (pin 20) contains lead-free NiPdAu plating compatible with reflow profiles up to 260 C peak per JEDEC J-STD-020.
