LM46000PWPR - 60V 0.5A Sync Step-Down Converter | Texas Instruments
Référence : LM46000PWPR ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.78 | $2,78 |
| 10 | $2.51 | $25,10 |
| 100 | $2.13 | $213,00 |
| 500 | $1.78 | $890,00 |
| 1 000 | $1.49 | $1 490,00 |
| 3 000 | $1.24 | $3 720,00 |
LM46000PWPR Présentation
A buck (step-down) DC-DC converter is a switching regulator that converts a higher DC input voltage to a lower DC output voltage with high efficiency by rapidly switching an internal MOSFET and storing energy in an external inductor and capacitor. The synchronous topology replaces the traditional freewheeling diode with a second MOSFET, reducing conduction loss and improving efficiency, especially at higher output currents. Buck converters sit within the broader power management IC hierarchy: switching regulator -> DC-DC converter -> power management IC -> semiconductor device, and are the dominant topology for non-isolated point-of-load regulation in industrial, automotive, and consumer systems.
The LM46000PWPR features 24 µA quiescent current in regulation, high efficiency at light load via DCM/PFM operation, an adjustable switching frequency range of 200 kHz to 2.2 MHz (500 kHz default), and an adjustable output voltage of 1V to 28V. It meets EN55022/CISPR 22 EMI standards, supports a wide 3.5V to 60V input range, and provides cycle-by-cycle current limiting, thermal shutdown, and an externally synchronizable RT/_SYNC pin. The HTSSOP-EP package's exposed pad yields a low junction-to-ambient thermal resistance for reliable operation at full 500mA load across the input range.
Typical applications include industrial 24V/48V sensor and actuator rails, factory automation PLC I/O, automotive infotainment and body electronics (non-safety), battery-powered portable instrumentation, and distributed POL (point-of-load) regulation in telecom/datacom systems. The wide 60V input tolerance allows direct connection to rectified AC inputs and 48V telecom rails without upstream protection.
When designing with this device, select the inductor based on the chosen switching frequency to keep ripple current at 20-40% of IOUT, and place the input ceramic bypass capacitor within 5mm of the PVIN and PGND pins. The PGND and AGND planes must be joined at a single point near the exposed pad to minimize switching-noise coupling into sensitive analog circuits.
This page synthesizes distributor pricing from DigiKey, Mouser, and LCSC as of 2026-10-08, plus parametric drop-in alternatives (LM46001, LM46002, LM43603, LMR16006) and practical design notes that go beyond the manufacturer datasheet.
Alternatives de remplacement direct pour LM46000PWPR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LM46000PWPR (même facteur de forme et même empreinte) — différant par EMI Compliance, Mounting Type, Output Voltage Range, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LM46000PWPT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM46001PWPR
✅ Remplacement direct✓ En stock
$1.18 / unité
Voir la fiche technique →LM46002PWPR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM46000PWP
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM46001AQPWPRQ1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM43603QPWPRQ1
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM46000PWPR Valeurs maximales et caractéristiques électriques
| Topologie | Synchronous Buck (Step-Down) |
| Plage de tension d'entrée | 3.5 V to 60 V |
| Plage de tension de sortie | 1 V to 28 V (Adjustable) |
| Courant de sortie maximal | 500 mA (0.5 A) |
| Quiescent Current (Regulation) | 24 µA |
| Switching Frequency Range | 200 kHz to 2.2 MHz (500 kHz default) |
| Control Mode | Peak Current Mode |
| Light-Load Operation | DCM / PFM |
| EMI Compliance | EN55022 / CISPR 22 |
| Redressement synchrone | Integrated |
| Boîtier | HTSSOP-16-EP (PWP) 4.40 mm |
| Type de montage | Surface Mount |
| Plage de température de fonctionnement | -40 °C to +125 °C |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de LM46000PWPR
| Broche 1 | AGND — Analog ground - connect to PGND at single point |
| Broche 2 | FB — Feedback input to internal error amplifier (1V reference) |
| Broche 3 | RT/SYNC — Frequency set resistor / external clock sync input |
| Broche 4 | EN — Enable input (active high, precision UVLO threshold) |
| Broche 5 | BOOT — Bootstrap capacitor for high-side gate driver |
| Broche 6 | HO — High-side MOSFET gate drive (test pin) |
| Broche 7 | SW — Switch node - connect to external inductor |
| Broche 8 | SW — Switch node (parallel pin to reduce impedance) |
| Broche 9 | SW — Switch node (parallel pin to reduce impedance) |
| Broche 10 | PGND — Power ground - return for synchronous rect |
| Broche 11 | PGND — Power ground (parallel pin) |
| Broche 12 | VCC — Internal LDO output - bypass with 1µF ceramic |
| Broche 13 | VIN — Supply input for internal LDO |
| Broche 14 | PVIN — Power input for high-side MOSFET |
| Broche 15 | PVIN — Power input (parallel pin) |
| Broche 16 | SS/TR — Soft-start / tracking input |
Applications typiques
LM46000PWPR convient pour 6 applications: Industrial 24V Sensor and Actuator Rails, Automotive Infotainment and Body Electronics, 48V Telecom and Datacom Point-of-Load, Battery-Powered Portable Instrumentation, Factory Automation PLC I/O Power, Distributed POL in Distributed Power Systems.
Industrial 24V Sensor and Actuator Rails
The LM46000PWPR is ideal for 24V industrial sensor and actuator power rails because its 3.5V to 60V input range accepts 24V nominal directly without pre-regulation, and its 500mA output current supports a typical PLC sensor node (4-20mA loops, digital I/O, opto-isolators). According to the TI datasheet, the 24µA quiescent current in regulation preserves standby power budget in always-on systems, while EN55022/CISPR 22 EMI compliance reduces external filtering in factory-automation PLCs. The HTSSOP-16-EP package delivers a low junction-to-ambient thermal resistance, allowing full 0.5A output at 60V input without heatsinking.
Recommandé
Automotive Infotainment and Body Electronics
The LM46000PWPR (or its automotive-grade sibling LM46001AQPWPRQ1) suits 12V automotive infotainment and body-electronics rails due to its 60V input tolerance, which absorbs load-dump transients (clamped at ~40V by TVS) and jump-start events (24V) without damage. The wide 1V to 28V adjustable output covers 5V, 3.3V, 1.8V, and 1.2V rails typically required by infotainment processors, audio DSPs, and CAN transceivers. Per the TI datasheet, the integrated synchronous rectification and 24µA IQ minimize both conduction loss and standby drain, important for parked-vehicle quiescent-current budgets.
Recommandé
48V Telecom and Datacom Point-of-Load
The LM46000PWPR is suitable for 48V telecom/datacom point-of-load regulation where the wide 60V input directly accepts nominal 48V rails (with margin for transient events) and steps down to 12V, 5V, or 3.3V for downstream POL converters. The adjustable 200kHz to 2.2MHz switching frequency allows the designer to place the fundamental below 150kHz (AM radio band) or above 1.8MHz (out of sensitive bands), and the externally synchronizable RT/SYNC pin can lock the regulator to a system master clock. Per the datasheet, the EN55022/CISPR 22 EMI compliance simplifies conducted-emission certification for telecom shelves.
Recommandé
Battery-Powered Portable Instrumentation
The LM46000PWPR fits battery-powered portable instrumentation thanks to its 24µA quiescent current in regulation, achieved through DCM/PFM light-load operation that skips switching pulses at low load. This low IQ preserves battery runtime in handheld oscilloscopes, data loggers, and field meters that spend most of their time in standby. According to the TI datasheet, the wide 3.5V to 60V VIN also supports direct operation from multi-cell Li-ion stacks (4S to 12S nominal) and rectified AC sources without an upstream pre-regulator, reducing BOM and solution size.
Recommandé
Factory Automation PLC I/O Power
The LM46000PWPR is well-suited for factory-automation PLC I/O power because its 60V input tolerance and EN55022/CISPR 22 EMI compliance simplify certification of industrial control equipment. The 500mA output current can supply a 24V-to-5V intermediate bus that powers digital I/O optocouplers, isolated RS-485 transceivers, and HMI display backlights. Per the TI datasheet, the peak current-mode control and external compensation network allow designers to optimize the loop for the specific load profile, while cycle-by-cycle current limiting and thermal shutdown protect the system against field-fault events.
Recommandé
Distributed POL in Distributed Power Systems
The LM46000PWPR is ideal for distributed point-of-load (POL) regulation in distributed power architecture (DPA) systems, where a front-end AC-DC or isolated DC-DC converter provides a 24V or 48V intermediate bus, and the LM46000PWPR steps this down to local 5V, 3.3V, or 1.8V rails for FPGAs, ASICs, and microcontrollers. The pin-to-pin compatible family (LM46001 1A, LM46002 2A) enables a single PCB layout to support multiple load tiers by simply swapping the IC, simplifying platform designs. According to the TI datasheet, the synchronous rectification and 200kHz to 2.2MHz adjustable frequency minimize external LC filter size and support a compact, high-density solution.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM46000PWPR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM46000PWPT | LM46001PWPR | LM46002PWPR | LM46000PWP | LM46001AQPWPRQ1 | LM43603QPWPRQ1 |
|---|---|---|---|---|---|---|---|
| Package | HTSSOP-16-EP (PWP) | HTSSOP-16-EP (PWP) - same | HTSSOP-16-EP (PWP) - same | HTSSOP-16-EP (PWP) - same | HTSSOP-16-EP (PWP) - same | HTSSOP-16-EP (PWP) - same | HTSSOP-16-EP (PWP) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 500 mA | 500 mA | 1 A | 2 A | 500 mA | 1 A | 3 A |
| Input Voltage Range | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 60 V | 3.5 V to 36 V |
| Output Voltage Range | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V | 1 V to 28 V |
| Quiescent Current | 24 µA | 24 µA | 24 µA | 24 µA | 24 µA | 24 µA | 27 µA |
| Switching Frequency Range | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz | 200 kHz to 2.2 MHz |
| Automotive Grade (AEC-Q100) | No | No | No | No | No | Yes | Yes |
| Reel Quantity | 2000 | 250 | 2000 | 2000 | Tube | 2000 | 2000 |
Principaux différenciateurs
- Pin-to-pin compatible 0.5A/1A/2A family (vs LM46001PWPR / LM46002PWPR)
- Widest VIN range in its class (60V) (vs LM43603QPWPRQ1)
- Automotive-grade option in same package (vs LM46001AQPWPRQ1)
Notes de conception
Place the input ceramic bypass capacitor (X7R, 1µF minimum, 4.7µF recommended) within 5mm of the PVIN and PGND pins. Route the SW node traces as short and wide as possible to minimize voltage spikes and EMI. According to TI's recommended layout in the LM46000 datasheet, the PGND and AGND planes must be joined at a single point near the exposed thermal pad to prevent switching noise from coupling into the sensitive analog feedback path. The exposed pad (pin 17) must be soldered to a copper pour of at least 100 mm² for proper thermal dissipation.
Do not exceed the 60V absolute maximum input voltage, even transiently - 65V is the absolute max and is not a continuous operating point. The BOOT capacitor (typically 0.1µF X7R) must be placed near the BOOT and SW pins to prevent high-side gate drive undervoltage. Per the datasheet, the SS/TR pin capacitor controls the soft-start ramp; leaving it floating enables internal soft-start, but a small external capacitor (10nF) is recommended for controlled inrush on capacitive loads. Output voltage must be set with 1%-tolerance feedback resistors (RFB1, RFB2) for proper regulation accuracy.
Estimated: at VIN=24V, VOUT=5V, and full 500mA load, the LM46000PWPR dissipates approximately (24-5)*0.5 = 9.5W internally. The HTSSOP-16-EP package has a junction-to-ambient thermal resistance (θJA) of approximately 41°C/W on a 4-layer JEDEC test board, yielding a junction temperature rise of ~390°C above ambient - clearly above the 150°C absolute limit. For continuous high-input-voltage operation, a larger copper pour (>= 500 mm² on top layer plus via-array to bottom layer) is required, or a higher current part (LM46001/LM46002) should be considered for thermal headroom.
The LM46000PWPR is designed to meet EN55022/CISPR 22 conducted EMI standards, but the input filter design is critical to compliance. Per the TI datasheet, a 4.7µF X7R ceramic input capacitor plus a small ferrite bead (or π-filter) is typically required. Switching frequency should be chosen above 1.8MHz if AM-band (530-1700kHz) interference is a concern, or synchronized to a frequency that places switching harmonics away from sensitive IF bands. The RT/SYNC pin allows synchronization to an external clock to avoid intermodulation with system clocks.
Informations de conformité
RoHS compliant per TI product page. Not AEC-Q100 qualified - for automotive applications, use LM46001AQPWPRQ1 instead. EN55022/CISPR 22 EMI compliant per TI datasheet feature list.
