LM5117PMH/NOPB - 5.5-65V Sync Buck Controller | Texas Instruments
N.º da peça: LM5117PMH/NOPB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.2 | $8,20 |
| 10 | $7.38 | $73,80 |
| 100 | $6.4 | $640,00 |
| 500 | $5.6 | $2.800,00 |
| 1.000 | $4.92 | $4.920,00 |
LM5117PMH/NOPB Visão geral
A synchronous buck controller is a type of DC-DC switching regulator within the broader power management IC family that uses external MOSFETs to achieve high efficiency by replacing the freewheeling diode with a low-side switch. This architecture reduces conduction losses and improves efficiency, especially at high output currents. The LM5117PMH/NOPB employs emulated peak current-mode control, providing inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation.
Key features include the wide 5.5V to 65V input range, an analog current monitor output for system telemetry, programmable switching frequency up to 530kHz, and 3.3A peak gate drive strength for high-side and low-side external MOSFETs. The device also offers a precision 1.5% voltage reference with output programmable from 0.8V, adaptive dead-time control, optional diode emulation mode, an enable pin for power sequencing, and thermal shutdown protection.
The emulated current-mode control architecture senses the low-side MOSFET current via an external sense resistor, delivering excellent line and load transient response while simplifying compensation network design compared to voltage-mode controllers. Robust gate drivers with adaptive dead-time minimize switching losses in the external power stage, and diode emulation improves light-load efficiency.
Typical applications include industrial power supplies, automotive infotainment and body electronics, telecom and networking equipment, and high-voltage battery-powered systems. The wide input range suits 12V, 24V, and 48V bus systems as well as automotive load-dump conditions. TI reference design PMP20808 demonstrates 25V output at 18A from a 38V nominal input.
When designing with this controller, keep gate drive paths short and place the bootstrap capacitor close to the IC; locate the current sense resistor at the low-side MOSFET source for accurate sensing. Program the switching frequency with an external resistor to optimize the efficiency-versus-size trade-off.
Alternativas drop-in para LM5117PMH/NOPB — 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 LM5117PMH/NOPB (mesmo formato e footprint) — diferindo em Package, RoHS Status, Switching Frequency, Control Method, Input Voltage Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LM5117PMHX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM5117MHX/NOPB
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$2.2 / unidade
Ver ficha técnica →LM5117QPMHX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM5117QMHX/NOPB
✅ Drop-In✓ Em estoque
$3.72 / unidade
Ver ficha técnica →LM5116MH/NOPB
⚡ Mesmo encapsulamento ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
LM5117PMH/NOPB Classificações máximas e características elétricas
| Topologia | Synchronous Buck (Step-Down) Controller |
| Control Method | Emulated Peak Current Mode |
| Faixa de tensão de entrada | 5.5 V to 65 V |
| Output Voltage (min programmable) | 0.8 V |
| Reference Voltage Accuracy | 1.5% |
| Frequência de comutação | Programmable up to 530 kHz |
| Gate Drive Peak Current | 3.3 A |
| Maximum Duty Cycle | 95% |
| Outputs | 1 |
| Special Features | Analog current monitor, diode emulation, adaptive dead-time |
| Temperatura de operação | -40C to +125C |
| Encapsulamento | HTSSOP-20 (PWP) with exposed pad |
| Tipo de montagem | Surface Mount |
| Protection | Cycle-by-cycle current limit, thermal shutdown |
| Pino de habilitação | Yes |
| Status RoHS | Compliant (NOPB = No Pb) |
Configuração de pinos do LM5117PMH/NOPB
| Pino 1 | VIN — Input supply, 5.5V to 65V |
| Pino 2 | UVLO — Under-voltage lockout programming |
| Pino 3 | EN — Enable (power sequencing) |
| Pino 4 | RT — Switching frequency programming resistor |
| Pino 5 | SS — Soft-start programming |
| Pino 6 | FB — Feedback input, 0.8V reference |
| Pino 7 | COMP — Loop compensation |
| Pino 8 | AGND — Analog ground |
| Pino 9 | CSG — Current sense, low-side MOSFET source |
| Pino 10 | DE — Diode emulation enable |
| Pino 11 | CM — Analog current monitor output |
| Pino 12 | PGND — Power ground |
| Pino 13 | LO — Low-side gate drive |
| Pino 14 | PGND — Power ground (driver return) |
| Pino 15 | HB — High-side bootstrap supply |
| Pino 16 | HO — High-side gate drive |
| Pino 17 | SW — Switch node |
| Pino 18 | VCC — Internal LDO output / driver supply |
| Pino 19 | PGOOD — Power good indicator |
| Pino 20 | AGND — Analog ground |
Aplicações típicas
LM5117PMH/NOPB é adequado para 6 aplicaçãos: Industrial Power Supplies, Automotive Infotainment and Body Electronics, Telecom and Networking Equipment, High-Voltage Battery-Powered Systems, High-Current Point-of-Load Preregulators, Test and Measurement Instrumentation.
Industrial Power Supplies
Industrial 24V and 48V PLC and instrumentation rails demand tolerance of widely varying input supplies. The LM5117PMH/NOPB accepts 5.5V to 65V and, with emulated peak current-mode control, delivers cycle-by-cycle current limiting and easy loop compensation across the range. Placed ahead of logic or analog rails, its 0.8V reference and 1.5% accuracy hold tight regulation while the analog current monitor supports predictive maintenance telemetry.
Recomendado
Automotive Infotainment and Body Electronics
Automotive battery rails swing during cranking and load dump, so a controller surviving 65V transients is essential. The AEC-Q100 qualified sibling LM5117QMHX/NOPBQ1 shares the LM5117 footprint, and the 3.3A gate drives efficiently switch external MOSFETs for audio head units and body controllers. Diode emulation mode improves light-load efficiency when the system idles, reducing quiescent drain on the battery.
Recomendado
Telecom and Networking Equipment
48V telecom intermediate bus boards benefit from the 65V maximum input and up to 530kHz programmable frequency, which shrinks magnetics in dense line cards. Emulated current-mode control gives fast line transient response on noisy 48V supplies, and the analog current monitor feeds board-level telemetry to an ADC such as the ADS1115. Adaptive dead-time control keeps efficiency high across load in hot-swappable racks.
Recomendado
High-Voltage Battery-Powered Systems
Battery stacks for robotics and portable industrial equipment generate wide, sagging bus voltages; the 95% maximum duty cycle lets the LM5117PMH/NOPB keep regulating as the pack discharges toward the 5.5V minimum. Sense-resistor-based current limiting protects the power stage against shorts, while cycle-by-cycle limiting and thermal shutdown guard during stalled-load events, improving overall system robustness.
Recomendado
High-Current Point-of-Load Preregulators
In multi-board systems, the LM5117PMH/NOPB acts as a first-stage preregulator stepping 48V down to an intermediate rail feeding point-of-load converters such as the TPS53624. TI reference design PMP20808 demonstrates 25V at 18A from a 38V nominal input, showing the controller driving external MOSFETs with 3.3A gate drive for low switching loss at high current.
Recomendado
Test and Measurement Instrumentation
Bench instruments and data-acquisition front ends need quiet, precisely regulated rails derived from varying line inputs. The LM5117PMH/NOPB provides a stable intermediate rail with cycle-by-cycle current limiting, and diode emulation reduces switching ripple at light load before downstream linear regulators such as the TPS7A8300 filter critical analog supplies, combining wide-input efficiency with ultra-low output noise.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM5117PMH/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM5117PMHX/NOPB | LM5117QPMHX/NOPB | LM5117QMHX/NOPBQ1 | LM5116MH/NOPB |
|---|---|---|---|---|---|
| Package | HTSSOP-20 (PWP) | HTSSOP-20 (PWP) - same | HTSSOP-20 (PWP) - same | HTSSOP-20 (PWP) - same | HTSSOP-20 (PWP) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 5.5 V to 65 V | 5.5 V to 65 V | 5.5 V to 65 V | 5.5 V to 65 V | 5.5 V to 65 V |
| Control Architecture | Emulated peak current mode | Emulated peak current mode | Emulated peak current mode | Emulated peak current mode | Emulated peak current mode |
| Analog Current Monitor | Yes | Yes | Yes | Yes | No |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Principais diferenciais
- Analog current monitor for telemetry (vs LM5116MH/NOPB)
- Automotive upgrade path (vs LM5117QMHX/NOPBQ1)
- Wide 65V input with high duty cycle (vs LM5116MH/NOPB)
Notas de projeto
Keep gate drive loops as short as possible: place the HO/LO gate resistors and the bootstrap capacitor (HB to SW) within a few millimeters of the LM5117. Use a solid power ground plane connected to PGND and keep analog ground (AGND) as a quiet star point tied at a single node. Locate the current sense resistor at the low-side MOSFET source with Kelvin connections to CSG for accurate current-mode sensing.
Program the switching frequency with the RT resistor to balance efficiency and size - at 65V input, excessive frequency increases switching loss in the high-side MOSFET. Do not omit the bootstrap diode/capacitor refresh path. Verify UVLO programming against minimum battery or bus voltage so the controller does not chatter during input dips.
The HTSSOP-20 (PWP) exposed pad must be soldered to a copper pour of at least several square centimeters with thermal vias; controller junction temperature depends mainly on gate drive losses, which scale with frequency and MOSFET gate charge. For 18A-class outputs like TI reference design PMP20808, use MOSFETs with low gate charge to keep driver dissipation manageable.
Informações de conformidade
/NOPB suffix indicates No Pb (lead-free). AEC-Q100 qualification applies to the LM5117QMHX/NOPBQ1 variant, not this commercial part.
