RT8462GS - High-Voltage LED Driver Controller | Richtek | Buck/Boost
N.º da peça: RT8462GS ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $1.36 | $1,36 |
| 10 | $1.22 | $12,20 |
| 100 | $1.08 | $108,00 |
| 500 | $0.95 | $475,00 |
| 1.000 | $0.85 | $850,00 |
RT8462GS Visão geral
An LED driver controller is a power management integrated circuit (PMIC) that regulates the current flowing through a string of high-brightness LEDs. It belongs to the broader hierarchy of LED drivers -> power management IC -> power management -> semiconductor. Unlike a fixed-voltage regulator that targets a DC rail, an LED driver maintains constant current so that LED brightness and color temperature stay consistent regardless of supply variation, temperature drift, or forward-voltage bin spread.
Key features of the RT8462GS include a low-side current sense amplifier with programmable threshold, an internal soft-start to limit inrush current, under-voltage lockout (UVLO), over-current protection (OCP), and over-temperature protection (OTP). The analog dimming input accepts a 0 to 1.2 V DC signal and the PWM dimming input accepts a TTL-level duty cycle from 100 Hz to 20 kHz, both supporting high-contrast dimming ratios needed for display backlight and architectural lighting.
The RT8462GS uses peak current-mode control with a transconductance error amplifier referenced to an internal bandgap. The high-side gate driver output swings to the BST pin voltage, allowing use with logic-level N-channel MOSFETs. This topology provides simple loop compensation with a single Type-II network and inherent cycle-by-cycle current limiting.
Typical applications include LCD monitor and TV LED backlight drivers, automotive interior and exterior lighting, architectural and stage lighting fixtures, and high-power portable lighting where efficiency and dimming flexibility matter.
When designing with the RT8462GS, choose the external MOSFET and inductor to match the LED string current and switching frequency; ensure the BST capacitor and gate-drive resistor are sized per the manufacturer's typical application circuit. Provide adequate PCB copper for the power-stage ground return and route the current-sense traces as a Kelvin connection to avoid ground bounce.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet summary.
Alternativas drop-in para RT8462GS — 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 RT8462GS (mesmo formato e footprint) — diferindo em Package, RoHS Status, Topology.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
RT8462GSP
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MP3388
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LT3791EFE#PBF
✅ Drop-In✓ Em estoque
$10.76 / unidade
Ver ficha técnica →NCP81239
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LTC3861
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
RT8462GS Classificações máximas e características elétricas
| Product Type | LED Driver Controller (PWM Controller) |
| Topologia | Step-Down (Buck), Step-Up (Boost), Buck-Boost |
| Número de saídas | 1 |
| Faixa de tensão de entrada | Up to 36 V |
| Tensão de saída - máx. | 60 V |
| Switching Frequency (max) | 1 MHz |
| Dimming Control | Analog and PWM |
| Control Method | Current-mode PWM with external MOSFET driver |
| Current Sense | External low-side resistor |
| Encapsulamento | 14-SOP (SOP-14) |
| Tipo de montagem | Surface Mount |
| Lead Free Status | Lead Free |
| Status RoHS | RoHS Compliant |
| Typical Application | High-power LED backlight, automotive, architectural lighting |
Configuração de pinos do RT8462GS
| Pino 1 | COMP — Error amplifier compensation node |
| Pino 2 | FB — Current feedback / current sense input |
| Pino 3 | CS — Peak current sense input (low-side) |
| Pino 4 | GND — Analog and power ground |
| Pino 5 | OSC — Oscillator timing resistor / frequency set |
| Pino 6 | RT — Timing resistor for oscillator |
| Pino 7 | DIM/PWM — PWM dimming input (TTL duty cycle) |
| Pino 8 | ADIM — Analog dimming input (0 to 1.2 V) |
| Pino 9 | EN — Enable / shutdown input |
| Pino 10 | VCC — Supply voltage for internal logic |
| Pino 11 | BST — Bootstrap supply for high-side gate driver |
| Pino 12 | DRV — Gate drive output to external MOSFET |
| Pino 13 | VIN — Input voltage (up to 36 V) |
| Pino 14 | VOUT/LED+ — LED string positive terminal / output |
Aplicações típicas
RT8462GS é adequado para 6 aplicaçãos: LCD Monitor and TV LED Backlight Driver, Automotive Interior and Exterior Lighting, Architectural and Stage Lighting, High-Power Portable LED Flashlight and Work Light, Industrial LED Sign and Channel-Letter Lighting, RGB and Tunable-White LED Strip Driver.
LCD Monitor and TV LED Backlight Driver
The RT8462GS fits LCD backlight designs because its current-mode PWM control and up to 1 MHz switching frequency let engineers shrink the boost inductor and EMI filter, while the 60 V output rating directly drives long LED strings typically required for 32-inch to 65-inch displays. Placed between the 12 V or 24 V system rail and the LED string cathode/anode network, the controller delivers constant current that keeps backlight brightness uniform across the panel and the operating temperature range. PWM dimming at TTL levels interfaces directly with the panel timing controller for 0 to 100% brightness control at video rates without flicker artefacts. Compared with linear LED drivers, the RT8462GS achieves 90%+ efficiency at full brightness, reducing thermal load in the slim monitor enclosure and extending LED lifetime by limiting thermal stress on each emitter.
Recomendado
Automotive Interior and Exterior Lighting
The RT8462GS suits automotive lighting because its 36 V input tolerance handles 12 V and 24 V automotive buses with load-dump margin, while its 60 V output stage drives multi-LED strings for daytime running lights, tail lamps, and interior ambient lighting. The current-sense amplifier maintains tight regulation across the wide -40 C to +125 C automotive temperature range, keeping LED brightness and chromaticity consistent under cold-crank and high-ambient conditions. PWM dimming at 100 Hz to 20 kHz supports sequential turn signals and animated interior lighting effects. Unlike fixed-voltage regulators that cannot compensate for LED forward-voltage variation across temperature, the RT8462GS uses current-mode control that adapts automatically. Designers should still validate AEC-Q100 qualification status with Richtek directly before using this part in safety-critical automotive applications.
Recomendado
Architectural and Stage Lighting
The RT8462GS supports architectural and stage lighting because it accepts both analog (0 to 1.2 V) and PWM (TTL duty-cycle) dimming, enabling smooth fades for theatre dimming and high-contrast strobe effects for concerts. The Buck-Boost topology flexibility lets a single design drive LED strings with forward voltages both above and below the supply rail, which is critical when the same fixture must accept 12 V, 24 V, or 48 V inputs on different jobs. Operating at 1 MHz keeps the inductor small enough to fit inside compact track-light housings, while the OCP and OTP protection features prevent thermal runaway if a fixture is mis-wired or installed in a poorly ventilated ceiling. Compared with discrete driver designs, the RT8462GS replaces dozens of components with a single 14-SOP controller, reducing BOM cost and assembly time for OEM fixture makers.
Recomendado
High-Power Portable LED Flashlight and Work Light
The RT8462GS suits high-power portable lighting because its 1 MHz switching frequency enables a small toroidal inductor that fits inside a flashlight head or work-light handle, and its wide input range accepts 1S to 3S Li-ion battery packs without an additional boost stage. Current-mode control with cycle-by-cycle current limiting protects the LED string and battery from over-current during load transients when the battery voltage sags at low state of charge. Analog dimming from 0 to 1.2 V lets a microcontroller PWM-output through a low-pass filter to set brightness smoothly from 5% to 100%, extending battery runtime for outdoor users. The SOP-14 package is hand-solderable for low-volume prototype runs, though production designs should use reflow profiles per the JEDEC J-STD-020 specification.
Recomendado
Industrial LED Sign and Channel-Letter Lighting
The RT8462GS supports industrial LED signage because its 60 V output rating drives long series strings of sign LEDs directly, eliminating the need for multiple parallel driver channels. The Buck topology works well at 24 V or 36 V industrial bus voltages commonly found in commercial buildings, achieving 90%+ efficiency that lowers operating cost and reduces heat-sink requirements in sealed channel-letter housings. UVLO protects the controller and LEDs from low-voltage brownout events, while OTP shuts the controller down if the channel-letter enclosure overheats in direct sun. Compared with linear LED regulators that waste power as heat, the RT8462GS's PWM switching keeps the channel letter cooler, extending LED lifetime and reducing warranty returns.
Recomendado
RGB and Tunable-White LED Strip Driver
The RT8462GS drives RGB and tunable-white LED strips because the controller can be paralleled across three or four channels (one controller per color string) with individual PWM dimming inputs tied to a microcontroller's color-mixing outputs. The 1 MHz switching frequency keeps each channel's boost or buck-boost inductor small enough to mount directly on the strip PCB, while analog dimming provides a smooth 0 to 100% brightness curve within each PWM cycle. The 14-SOP package is small enough to fit inside a junction-box-sized controller, and the external MOSFET lets the designer pick a part sized for the strip current (often 350 mA to 1 A per color). This approach beats integrated multi-channel LED drivers when the designer needs flexibility for non-standard strip lengths and current ratings.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para RT8462GS — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MP3388 | LT3791 | NCP81239 | LTC3861 |
|---|---|---|---|---|---|
| Brand | Richtek | Monolithic Power Systems (MPS) | Analog Devices | onsemi | Analog Devices |
| Package | 14-SOP (SOP-14) | 14-SOP (SOP-14) | 14-SOP (SOP-14) | 14-SOP (SOP-14) | 14-SOP (SOP-14) |
| Topology Support | Buck / Boost / Buck-Boost | Multi-topology LED controller | Buck-Boost LED controller | Multi-topology | Multi-topology current-mode controller |
| Dimming Interface | Analog + PWM | Analog + PWM | Analog + PWM | Analog + PWM | PWM (verify analog input per datasheet) |
Principais diferenciais
- Triple-topology support in one controller IC (vs LT3791)
- Independent analog and PWM dimming inputs (vs LTC3861)
- Wide 60 V output rating without external cascode (vs NCP81239)
Notas de projeto
The RT8462GS dissipates only controller quiescent power (typically under 100 mW), but the external MOSFET and inductor carry the LED string current. At 1 A continuous load with a 0.05 ohm Rdson MOSFET, the FET dissipates roughly 50 mW; at 3 A this rises to 450 mW. Mount the external MOSFET on at least 100 mm^2 of copper pour, use the SOP-14 thermal pad copper area to keep the controller below 100 C junction, and ensure airflow or heatsinking if the LED string forward voltage pushes VIN-VOUT above 5 V at full current.
Route the CS (current-sense) trace as a Kelvin connection from the low-side FET source to the sense resistor, keeping the trace short and away from the switching node. Place the BST capacitor (typically 0.1 uF ceramic) within 3 mm of the BST and DRV pins to keep the high-side gate drive clean. Use a ground plane on layer 2 with a single via connection for the CS return to avoid ground bounce that corrupts the current-sense threshold.
Do not exceed 36 V on VIN or 60 V on the LED string terminal; both limits are absolute maximums per the datasheet. Always include a bootstrap diode from VCC to BST (a 1N4148 or Schottky is typical) and ensure the BST voltage stays below the absolute maximum. Verify that the PWM dimming frequency is below 20 kHz to avoid audible noise in the inductor, and above 100 Hz to avoid visible LED flicker. Estimated: power dissipation values quoted above assume 25 C ambient; derate for higher temperatures per the MOSFET datasheet.
Informações de conformidade
RoHS compliant and lead-free per DigiKey product page (3078384). AEC-Q100 qualification not stated on the datasheets.com listing; for safety-critical automotive designs, request qualification documentation from Richtek directly. REACH and conflict-mineral status not reported in the verified web data.
