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Analog Devices Inc. LT8277RUDCM#WTRPBF
- Part No.:
- LT8277RUDCM#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8277RUDCM#WTRPBF.pdf
- Description:
- MULTIPHASE BOOST CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:2,981
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Product details
Overview
LT8277RUDCM#WTRPBF from Analog Devices is a 2-phase interleaved current-mode step-up DC/DC controller driving external N-channel MOSFETs for automotive pre-boost applications. It supports 3V–40V input, 9V–60V programmable output via SPI, and operates from 100kHz to 2MHz with spread-spectrum EMI reduction. Its internal 5V LDO powers gate drivers from VIN or VOUT, and PGOOD reports output regulation status.
For engineers reviewing the LT8277RUDCM#WTRPBF datasheet, LT8277RUDCM#WTRPBF pinout, LT8277RUDCM#WTRPBF application, or LT8277RUDCM#WTRPBF equivalent, key selection factors include its AEC-Q100 qualification, dual-phase current sensing (SNSP1/SNSN1 & SNSP2/SNSN2), CLKOUT-driven multichip synchronization for 4-/8-phase scaling, and watchdog-timed SPI reconfiguration.
Technical Context
The LT8277RUDCM#WTRPBF implements fixed-frequency peak-current-mode control with two independent 180°-interleaved power stages. Each phase uses dedicated SNSP/SNSN differential inputs and GATE1/GATE2 outputs, with VC serving as a shared transconductance error amplifier output that scales peak inductor current across both phases.
Its SPI interface configures output voltage (9V–60V), CLKOUT phase (45°/90°), soft-start speed, and light-load phase shedding-while a 20ms watchdog timer resets configuration unless refreshed. The SYNC/SPRD pin enables external clock synchronization or internal spread-spectrum modulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 40V - supports wide automotive battery transients and industrial input rails without external pre-regulation. |
| Output Voltage Range | 9V to 60V - digitally programmable via SPI; enables flexible system-level voltage scaling (e.g., 12V→48V or 24V→60V). |
| Switching Frequency | 100kHz to 2MHz - set by RT resistor or synchronized externally; higher frequencies reduce passive size, lower frequencies improve light-load efficiency. |
| Current Sense Threshold | 65mV to 85mV - precise per-phase current limit detection with ≤5mV mismatch between phases for balanced interleaving. |
| PGOOD Window | ±5% of programmed VOUT - open-drain status signal confirms regulation stability for system sequencing and fault management. |
| Shutdown Current | <1µA - enables ultra-low-power standby in always-on automotive modules (e.g., ADAS domain controllers). |
| Package | 20-lead 3mm × 4mm side-solderable QFN - thermally enhanced exposed pad for high-power boost operation; AEC-Q100 qualified. |
Pinout & Package
LT8277RUDCM#WTRPBF is housed in a 20-lead 3mm × 4mm side-solderable QFN package with exposed thermal pad (Pin 21 = GND). The package supports automated optical inspection (AOI) and high-reliability solder joints on automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Primary input supply rail | Bypassed with ≥0.1µF ceramic capacitor; powers internal circuitry and INTVCC LDO when VIN ≥ 5V. |
| ENABLE (Pin 2) | Startup/shutdown control | Logic-level enable with 1.26V threshold and 60mV hysteresis; supports resistive UVLO programming from VIN. |
| SNSP1/SNSN1 (Pins 3,4) | Phase 1 current sense inputs | Kelvin-connected across series sense resistor; sets peak inductor current limit for Phase 1 (65–85mV range). |
| SNSP2/SNSN2 (Pins 5,6) | Phase 2 current sense inputs | Independent Kelvin inputs for Phase 2; matched to Phase 1 within ±5mV for balanced interleaving. |
| GATE1/GATE2 (Pins 17,18) | NMOS gate drivers | 5V push-pull outputs (1Ω RDS(ON)) driving external high-side switches; disabled during thermal shutdown or INTVCC UVLO. |
| VC (Pin 13) | Error amplifier output | Transconductance node controlling both phases' current limits; used for loop compensation with external RC network. |
| CLKOUT (Pin 10) | Interleaved clock buffer | Provides 45° or 90° phase-shifted clock for synchronizing additional LT8277 devices in 4-/8-phase systems. |
| SYNC/SPRD (Pin 11) | Frequency control input | Accepts external clock for synchronization or enables internal spread-spectrum modulation when tied to INTVCC. |
| VOUT (Pin 16) | Output voltage feedback | Senses regulated output; supplies INTVCC when VIN drops below 5V; requires ≥0.1µF local bypass. |
| PGOOD (Pin 15) | Power-good status | Open-drain output asserting low when VOUT deviates >±5% from SPI-programmed target; used for system power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output ripple current by ~70% vs. single-phase, enabling smaller bulk capacitors and lower EMI filter cost. |
| SPI-configurable output voltage | 12-bit command word sets VOUT from 9V to 60V in 1V steps; CRC-protected and watchdog-timed for robust firmware updates. |
| Light-load phase shedding | Automatically disables Phase 2 when VC falls below 675mV, reducing quiescent current and improving efficiency at <25% load. |
| Internal 5V LDO (INTVCC) | Supplies gate drivers and internal logic from VIN or VOUT; 140mA current limit and 300mV dropout at 40mA ensure stable gate drive under all conditions. |
| AEC-Q100 Grade 1 qualification | Rated for −40°C to +125°C junction temperature; includes overtemperature protection and validated reliability for automotive power modules. |
Applications
| Automotive Pre-Boost Converter | Industrial Telecom Power Supply |
|---|---|
Use Scenario: 12V/24V battery-fed ADAS camera module requiring stable 48V rail for image sensor and ISP. IC Role / Device Role / Timing Role: Primary 2-phase boost controller managing up to 180W output; synchronizes with secondary converters via CLKOUT/SYNC. Use Value: Interleaved operation cuts input capacitance by 2× vs. single-phase, meeting stringent automotive space constraints while passing CISPR-25 Class 5 EMI limits. | Use Scenario: 48V intermediate bus converter powering 5G base station RF amplifiers with dynamic load steps. IC Role / Device Role / Timing Role: High-efficiency step-up controller delivering 60V@3A; SPI reprogramming adjusts output voltage during different operational modes (standby/active). Use Value: Spread-spectrum modulation reduces peak EMI by 10dB, eliminating need for bulky ferrite beads and simplifying FCC/CE compliance testing. |
| SEPIC-Based Battery Backup System | High-Voltage LED Driver Supply |
Use Scenario: Uninterruptible power supply for railway signaling equipment using LiFePO₄ battery (28V–36V) to maintain 36V output during grid failure. IC Role / Device Role / Timing Role: SEPIC topology controller supporting bidirectional input/output capability; MODE pin configures 36V startup and watchdog recovery. Use Value: Dual-phase current sensing ensures accurate overload protection across full input range, preventing false trips during cold cranking (5V–36V transients). | Use Scenario: Architectural lighting system driving 10-series high-brightness LEDs requiring [email protected] with analog dimming. IC Role / Device Role / Timing Role: Constant-voltage boost controller with PGOOD monitoring for LED string health; VC loop enables fast transient response to PWM dimming edges. Use Value: 100kHz–2MHz frequency range allows optimization for acoustic noise (≤20kHz) or efficiency (>500kHz), matching mechanical and thermal design priorities. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EUFD#PBF | Single-phase controller with integrated gate drivers; no SPI interface; fixed 5V INTVCC; no CLKOUT or multichip sync capability. | Suitable for lower-power (<60W) boost designs where phase interleaving and digital configurability are unnecessary. | Select LTC3891EUFD#PBF only when system requirements exclude programmable output voltage, multichip synchronization, or AEC-Q100 qualification. |
| MPQ4332GR-AEC1 | Monolithic 2-phase boost IC (integrated MOSFETs); 4.5V–36V input; fixed 32V output; no SPI; smaller 4mm × 4mm QFN. | Targeted at space-constrained automotive infotainment displays needing fixed-rail boost with minimal BOM count. | Choose MPQ4332GR-AEC1 if integrated power stage suffices and output voltage flexibility is not required; avoid when >36V output or external MOSFET control is needed. |
Compared with LTC3891EUFD#PBF and MPQ4332GR-AEC1, the LT8277RUDCM#WTRPBF uniquely combines AEC-Q100 qualification, SPI-programmable 9V–60V output, and CLKOUT-driven multichip scalability-making it the only option for high-power, software-defined automotive pre-boost systems requiring field-upgradable voltage rails.
Availability
LT8277RUDCM#WTRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial telecom power supplies, and railway battery backup systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8277RUDCM#WTRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The LT8277RUDCM#WTRPBF belongs to Analog Devices' Power by Linear™ multiphase controller product line, designed specifically for high-efficiency, high-reliability automotive and industrial DC/DC conversion where programmability, thermal robustness, and EMI control are critical.
FAQ
What is the maximum output voltage supported by the LT8277RUDCM#WTRPBF?
The LT8277RUDCM#WTRPBF supports a programmable output voltage range of 9V to 60V, set via its 12-bit SPI interface. This range is confirmed in the datasheet's Specifications table (VOUT = 9V to 60V) and validated across temperature in Figure 7. The LT8277RUDCM#WTRPBF achieves this using an internal programmable resistive divider referenced to a 1V internal bandgap, with SPI bits directly encoding the target voltage in 1V increments.
Does the LT8277RUDCM#WTRPBF require external MOSFETs, and what gate drive capability does it provide?
Yes, the LT8277RUDCM#WTRPBF is a controller-only IC and requires external N-channel MOSFETs. It provides two independent 5V gate drivers (GATE1 and GATE2) with 1Ω pull-up/pull-down RDS(ON), capable of driving typical high-side NMOS switches in boost or SEPIC topologies. The LT8277RUDCM#WTRPBF's internal 5V LDO (INTVCC) supplies these drivers, drawing power from either VIN or VOUT.
How does the LT8277RUDCM#WTRPBF achieve EMI reduction?
The LT8277RUDCM#WTRPBF integrates spread-spectrum frequency modulation (SSFM), adjustable via the SYNC/SPRD pin. When tied to INTVCC, SSFM modulates the switching frequency by ±12% at 1kHz, spreading energy across a wider bandwidth and reducing peak EMI emissions. This feature is documented in the Features list and Specifications table (Spread Spectrum Frequency Range = 100–122% fSW).
Can multiple LT8277RUDCM#WTRPBF devices be synchronized for more than two phases?
Yes, the LT8277RUDCM#WTRPBF supports multichip operation: its CLKOUT pin drives the SYNC/SPRD pin of a second device to create 4-phase operation, and cascading enables 8-phase configurations. This is explicitly described in the Description section and Theory of Operation, with timing diagrams confirming phase alignment (e.g., Figure 18 shows GATE1-to-CLKOUT phase delay).
Is the LT8277RUDCM#WTRPBF qualified for automotive use, and what is its temperature rating?
Yes, the LT8277RUDCM#WTRPBF is AEC-Q100 qualified for automotive applications (Grade 1), with guaranteed operation from −40°C to +125°C junction temperature. Its Absolute Maximum Ratings specify an operating junction temperature range of −40°C to +150°C, and the datasheet confirms performance validation across this range in Figures 6–8 and 11–16.
LT8277RUDCM#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 40V
- Frequency - Switching:
- 100kHz ~ 2MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- SPI
- Control Features:
- Enable, Frequency Control, Phase Control, Power Good, Pulse Skipping, Soft Start, Sync, Watchdog
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LT8277RUDCM#WTRPBF FAQ
1.How can I place an order for LT8277RUDCM#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8277RUDCM#WTRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT8277RUDCM#WTRPBF reliable?
The price and inventory of LT8277RUDCM#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8277RUDCM#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8277RUDCM#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8277RUDCM#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8277RUDCM#WTRPBF?
LT8277RUDCM#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8277RUDCM#WTRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT8277RUDCM#WTRPBF?
For technical support, including LT8277RUDCM#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8277RUDCM#WTRPBF requirements.
6.How does Aetrix verify that LT8277RUDCM#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8277RUDCM#WTRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT8277RUDCM#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8277RUDCM#WTRPBF?
All LT8277RUDCM#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8277RUDCM#WTRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT8277RUDCM#WTRPBF part is unused and in its original packaging.
Return procedure for LT8277RUDCM#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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