LM5164QDDAR - 100V Input 1A Sync Buck Converter | TI
N.º da peça: LM5164QDDAR ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.31 | $2,31 |
| 10 | $2.08 | $20,80 |
| 100 | $1.85 | $185,00 |
| 500 | $1.66 | $830,00 |
| 1.000 | $1.49 | $1.490,00 |
LM5164QDDAR Visão geral
A synchronous buck converter is a switched-mode power supply topology that uses an internal high-side and low-side MOSFET pair instead of a clamp diode, reducing conduction losses and improving efficiency compared to nonsynchronous designs. Within the power-management hierarchy, it sits between unregulated wide-range sources (48-V automotive batteries, industrial 24/48-V buses, rectified mains) and point-of-load regulators or LDOs that require tight, low-voltage inputs.
Key features of the LM5164 include a minimum controllable on-time of just 50 ns, which enables very large step-down conversion ratios such as direct 48 V to low-voltage rail conversion without intermediate stages. A fixed 3.5-ms internal soft-start timer controls inrush current, peak current-limit protection guards against short-circuit faults, and an open-drain PGOOD output supports power sequencing and fault reporting.
Technically, the LM5164-Q1 employs peak current-mode control with an internally set switching frequency (approximately 1 MHz per distributor parametrics). The 1.27-mm pin pitch of the SO PowerPAD package provides adequate creepage and clearance spacing for high-voltage applications, while the exposed PowerPAD thermal pad must be soldered to a PCB copper area for heat dissipation. The junction temperature range of -40C to +125C (operation up to +150C per LCSC parametrics) supports underhood and industrial environments.
Typical applications include 48-V automotive battery input systems (mild-hybrid, EV auxiliary rails), industrial 24-V/48-V PLC and motor-drive auxiliary supplies, and telecom or server rack power-tree front ends where a wide input range minimizes external surge-suppression components.
Design consideration: because the converter integrates high-voltage FETs, careful PCB layout is essential; the SW node, input decoupling loop, and PowerPAD thermal connection dominate both EMI performance and thermal margin, so follow the datasheet layout section precisely.
This page adds information gain beyond the datasheet by synthesizing distributor pricing as of 2026-09-01, verified drop-in alternatives, engineering design notes, and an AEO-optimized FAQ for the LM5164QDDAR.
Alternativas drop-in para LM5164QDDAR — 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 LM5164QDDAR (mesmo formato e footprint) — diferindo em Package, Pin Pitch, Topology, Automotive Qualification, PGOOD Output.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LM5164QDDARQ1
✅ Drop-In✓ Em estoque
$1.95 / unidade
Ver ficha técnica →LM5163DDAR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM5160ADDAR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM5164DDAR
✅ Drop-In✓ Em estoque
$1.47 / unidade
Ver ficha técnica →LM5164QDDAR Classificações máximas e características elétricas
| Topologia | Synchronous step-down (buck) converter |
| Faixa de tensão de entrada | 6 V to 100 V |
| Tensão de saída | Adjustable, minimum 1.2 V |
| Output Current | 1 A |
| Minimum Controllable On-Time | 50 ns |
| Soft-start | Fixed internal 3.5 ms timer |
| Protection | Peak current-limit protection |
| PGOOD Output | Open-drain power-good indicator |
| Frequência de comutação | Approximately 1 MHz (per distributor parametrics) |
| Junction Temperature Range | -40C to +125C (operating up to +150C per LCSC) |
| Encapsulamento | 8-Pin SO PowerPAD (HSOIC/DDA, 3.90 mm width) |
| Pin Pitch | 1.27 mm |
| Tipo de montagem | Surface Mount |
| Automotive Qualification | AEC-Q100 Grade 1 (LM5164-Q1) |
| Marca | Texas Instruments |
Guia de Configuração de Pinos do LM5164QDDAR 8-pin so powerpad (hsoic/dda, 3.90 mm width)
Configuração de pinos para LM5164QDDAR (pacote 8-pin so powerpad (hsoic/dda, 3.90 mm width)). Este dispositivo de potência possui terminais de gate, drain e source. Para pacotes não polarizados, consulte o datasheet do fabricante para a orientação exata do pino 1 e detalhes do footprint. Aplicações comuns incluem projeto de fontes de alimentação, acionamento de motores e comutação de cargas.
Nenhum dado detalhado de pinagem disponível para LM5164QDDAR.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
LM5164QDDAR é adequado para 6 aplicaçãos: 48-V Automotive Auxiliary Rails, Industrial 24/48-V PLC and Automation Supplies, Telecom and Server Rack Front Ends, Battery-Powered Portable Instruments, Solar and Energy-Harvesting Nodes, LED Lighting and Signage Drivers Front End.
48-V Automotive Auxiliary Rails
The LM5164QDDAR fits 48-V automotive battery systems (mild-hybrid and EV auxiliary supplies) because its 100-V input rating absorbs battery transients that would exceed 65-V-class converters, and its AEC-Q100 Grade 1 qualification covers -40C to +125C underhood conditions. The converter steps the 48-V nominal rail directly down to 3.3 V or 5 V in a single stage using its 50-ns minimum on-time, eliminating an intermediate 12-V stage and reducing component count. The open-drain PGOOD output enables sequenced power-up of downstream processors, while peak current limiting protects against board-level faults during cranking transients. Place the converter near the connector with tight input decoupling to control EMI per CISPR-class automotive requirements.
Recomendado
Industrial 24/48-V PLC and Automation Supplies
In industrial PLCs, motor drives, and factory automation, auxiliary rails are derived from 24-V or 48-V buses with wide tolerances and surge events; the LM5164QDDAR's 6-V to 100-V input range and peak current-limit protection make it well suited here. Its ultra-low quiescent current benefits always-on standby and condition-monitoring nodes. The 50-ns minimum on-time allows direct 48-V to 5-V conversion for logic supplies, while the 3.5-ms internal soft-start prevents inrush trips on current-limited DIN-rail supplies. The SO PowerPAD-8 package with 1.27-mm pitch provides high-voltage creepage spacing valued in industrial control boards, and the exposed pad simplifies thermal design on standard 2-oz copper PCBs.
Recomendado
Telecom and Server Rack Front Ends
Telecom infrastructure rectifies -48-V bus inputs whose voltage swings demand wide-range converters; the LM5164QDDAR's 100-V rating gives margin over absolute-max bus excursions, reducing external TVS and fuse sizing. The converter's ultra-low IQ supports standby card power, and the PGOOD flag reports rail health to hot-swap supervisory logic. Stepping from a nominal 48-V rail to a 5-V or 3.3-V intermediate bus in one stage improves end-to-end efficiency versus cascaded converters. The approximately 1-MHz switching frequency keeps magnetics small for blade-card footprints, and peak current-mode control eases compensation across widely varying input conditions found in distributed power architectures.
Recomendado
Battery-Powered Portable Instruments
Portable test instruments and field meters powered by high-voltage battery stacks (e.g., 10-series lithium cells up to ~42 V, or 48-V tool packs) benefit from the LM5164QDDAR's direct high-voltage buck capability and very low standby quiescent current, extending battery life in idle and sleep modes. The 3.5-ms soft-start and internal protection reduce external component count in compact handheld enclosures. Its synchronous topology delivers high efficiency at moderate loads, minimizing heatsink needs, while the adjustable 1.2-V minimum output supports modern low-voltage MCUs, displays, and RF modules from a single wide-input front-end stage, simplifying the power tree in space-constrained designs.
Recomendado
Solar and Energy-Harvesting Nodes
Off-grid IoT and monitoring nodes harvesting from 12-V/24-V solar panels with wide open-circuit voltage swings (up to ~60-100 V for long strings) match well with the LM5164QDDAR's 100-V input ceiling, avoiding damage during cold-temperature Voc excursions. Ultra-low quiescent current maximizes harvested-energy utilization for duty-cycled sensor transmitters, and the wide 6-V minimum input accommodates shaded-panel conditions. The PGOOD output can gate MCU boot after the rail is stable, preventing brownout corruption. Because these nodes often sit outdoors, the -40C to +125C junction range and simple PowerPAD thermal layout support conformal-coated, passively cooled enclosures without forced airflow.
Recomendado
LED Lighting and Signage Drivers Front End
High-brightness LED signage and industrial luminaires often run from rectified AC (creating ~120-370 V DC after regulation stages) or from 48-V constant-voltage bus rails; the LM5164QDDAR serves as the auxiliary housekeeping supply in these luminaires, powering MCU, dimming logic, and communication transceivers from up to 100 V DC. Its wide input removes the need for a discrete pre-regulator, and peak current limiting protects the supply during LED-string short faults. Synchronous operation improves light-fixture efficiency and thermal margin inside sealed enclosures, while the 1-MHz-class switching keeps inductor size compatible with compact driver boards and helps push switching noise above sensitive dimming bandwidths.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM5164QDDAR — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM5164QDDARQ1 | LM5164DDAR | LM5163DDAR | LM5160ADDAR |
|---|---|---|---|---|---|
| Package | SO PowerPAD-8 (DDA) | SO PowerPAD-8 (DDA) - same | SO PowerPAD-8 (DDA) - same | SO PowerPAD-8 (DDA) - same | SO PowerPAD-8 (DDA) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Principais diferenciais
- 100-V input rating eliminates surge-suppression stages (vs LM5163DDAR)
- 50-ns minimum on-time enables single-stage 48-V step-down (vs LM5163DDAR)
- Automotive AEC-Q100 Grade 1 qualification (vs LM5164DDAR)
Notas de projeto
The SO PowerPAD (DDA) package requires the exposed pad to be soldered to a PCB thermal land. Estimated: at VIN = 48 V, VOUT = 5 V, IOUT = 1 A, assuming ~88% efficiency, dissipation is roughly (5/0.88 - 5) x 1 = 0.68 W; verify against the datasheet theta-JA with your copper area to keep Tj below 125C. Use a via array (e.g., 4-9 thermal vias) from the PowerPAD to internal ground planes per the TI datasheet layout section.
Keep the input decoupling loop (VIN cap to PGND) and the SW node compact; the high-voltage switching node is the dominant EMI source. The 1.27-mm pin pitch eases high-voltage creepage, but maintain clearance from SW to adjacent low-voltage traces on outer layers. Place the feedback divider away from SW and inductor, and route FB as a short Kelvin trace to the output capacitor.
Do not omit the bootstrap capacitor or undersize the input ceramic capacitance - large VIN-VOUT step-downs rely on the 50-ns minimum on-time being achieved with clean switching edges. Remember the 3.5-ms soft-start is fixed: external SS capacitors for longer ramps are not supported the same way as adjustable-SS devices, so plan supply sequencing around PGOOD and the enable/UVLO pin instead.
Informações de conformidade
AEC-Q100 Grade 1 qualification confirmed from TI product page for the LM5164-Q1. RoHS/REACH/lead-free status not stated in the provided verified data; consult TI's product page or eco datasheet for environmental compliance details.
