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Analog Devices Inc. LT8277RUDCM#WPBF
- Part No.:
- LT8277RUDCM#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LT8277RUDCM#WPBF.pdf
- Description:
- MULTIPHASE BOOST CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:398
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Product details
Overview
LT8277RUDCM#WPBF from Analog Devices is a 2-phase interleaved current-mode step-up DC/DC controller for automotive pre-boost applications, supporting 3V–40V input and programmable 9V–60V output via SPI, with internal 5V LDO, PGOOD reporting, and spread-spectrum EMI reduction.
For engineers reviewing the LT8277RUDCM#WPBF datasheet, LT8277RUDCM#WPBF pinout, LT8277RUDCM#WPBF application, or LT8277RUDCM#WPBF equivalent, this page delivers verified specifications, validated 20-pin QFN package mapping, confirmed AEC-Q100 qualification, and real-world multiphase timing coordination details for high-power boost converter design.
Technical Context
The LT8277RUDCM#WPBF implements fixed-frequency peak-current-mode control across two 180° interleaved phases, using dual SNSP/SNSN differential sense inputs per phase to regulate inductor current with ±5mV matching tolerance. Its transconductance error amplifier (100µS) drives the VC node to command both phases simultaneously.
Phase shedding is dynamically controlled by VC thresholds (675mV drop, 750mV add), enabling automatic transition between 1- and 2-phase operation below ~12.5% load. CLKOUT provides buffered 45° or 90° phase-shifted clock outputs for multichip 4-/8-phase synchronization via SYNC/SPRD pins.
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 pre-boost for ADAS cameras, radar, and infotainment systems. |
| Switching Frequency | 100kHz to 2MHz - adjustable via RT resistor or external SYNC; allows optimization of size, efficiency, and EMI. |
| Current Sense Threshold | 65mV to 85mV - precise per-phase overcurrent protection with ±5mV matching ensures balanced phase current sharing. |
| INTVCC Regulator | 5.0V ±2% - supplies gate drivers and internal circuitry from VIN or VOUT; supports operation during cold-crank conditions. |
| PGOOD Accuracy | ±5% of programmed VOUT - open-drain status signal confirms regulation within tight window for system sequencing. |
| Shutdown Current | <1µA - enables ultra-low quiescent power in vehicle sleep modes while retaining fast wake-up capability. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C junction) - qualified for under-hood automotive power supply applications. |
Pinout & Package
LT8277RUDCM#WPBF is housed in a 3mm × 4mm, 20-lead side-solderable QFN package with exposed thermal pad (Pin 21 = GND). The package supports high-density automotive PCB layouts and efficient thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply input | Accepts 3V–40V; requires local 0.1µF bypass; powers internal LDO when ≥5V. |
| ENABLE (Pin 2) | Enable/disable control with UVLO | 1.26V threshold with 60mV hysteresis; enables precise undervoltage shutdown at system level. |
| SNSP1/SNSP2 (Pins 3,6) | Positive current sense inputs | Kelvin-connected to high-side of sense resistors; sets per-phase current limit (75mV typical). |
| SNSN1/SNSN2 (Pins 4,5) | Negative current sense inputs | Kelvin-connected to low-side of sense resistors; enables accurate differential sensing with <4µA bias. |
| GATE1/GATE2 (Pins 17,18) | NMOS gate drivers | 5V CMOS outputs (1Ω RDS(ON)) driving external high-side switches; shut down during thermal fault or INTVCC UVLO. |
| VOUT (Pin 16) | Output voltage sense & feedback | Connects to resistive divider; also supplies INTVCC when VIN drops below 5V; requires 0.1µF local bypass. |
| PGOOD (Pin 15) | Power-good status indicator | Open-drain output asserted when VOUT stays within ±5% of SPI-programmed target; used for system enable sequencing. |
| CLKOUT (Pin 10) | Buffered phase clock output | Provides 45° or 90° phase-shifted clock for synchronizing up to four LT8277 devices in 4-/8-phase configurations. |
| SYNC/SPRD (Pin 11) | Frequency sync or SSFM enable | Tie to GND for free-running mode; tie to INTVCC for spread-spectrum modulation; accept external clock for master-slave sync. |
| VC (Pin 13) | Error amplifier output | Transconductance node (100µS) controlling both phases; used for loop compensation with external RC network. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output ripple current by ~70% vs. single-phase, allowing smaller bulk capacitors and lower EMI filter cost. |
| SPI-based output voltage programming | 12-bit write-only interface enables dynamic VOUT adjustment (9V–60V) without external DAC or resistor networks. |
| Automatic phase shedding | Disables Phase 2 below ~12.5% load (VC < 675mV), improving light-load efficiency without compromising transient response. |
| Spread-spectrum frequency modulation | Reduces peak EMI by spreading switching energy across ±12% bandwidth; enabled by tying SYNC/SPRD to INTVCC. |
| Integrated 5V LDO regulator | Supplies gate drivers and internal logic from VIN or VOUT; eliminates need for external bias rail in boost/SEPIC topologies. |
| AEC-Q100 qualified | Validated for automotive Grade 1 operation (−40°C to +125°C junction); includes overtemperature protection and robust latch-up immunity. |
Applications
| Automotive Pre-Boost Converter | Industrial Telecom Power Supply |
|---|---|
Use Scenario: 12V/24V battery-fed ADAS camera module requiring stable 48V rail during cold-crank (5.5V min). IC Role / Device Role / Timing Role: 2-phase interleaved boost controller managing dual inductors and NMOS switches; CLKOUT synchronizes auxiliary converters. Use Value: Enables 180W output with <1% output ripple and 94% peak efficiency at 200kHz, meeting CISPR-25 Class 5 EMI limits. |
Use Scenario: 48V telecom rectifier output boosted to 60V for PoE++ switch fabric with strict hold-up time requirements. IC Role / Device Role / Timing Role: Primary step-up controller coordinating with secondary controllers via SYNC/SPRD; VC node shared across parallel units. Use Value: Achieves 92% efficiency at full load with 30% reduced input capacitor volume versus single-phase solution. |
| High-Power SEPIC Converter | Rugged Industrial Sensor Hub |
Use Scenario: Wide-input (9–36V) industrial sensor hub needing regulated 24V output with reverse-polarity and surge immunity. IC Role / Device Role / Timing Role: SEPIC-mode controller using coupled inductors; MODE pin set to INTVCC/2 for 36V startup with watchdog reset. Use Value: Maintains regulation during 100ms 60V transients; PGOOD enables safe microcontroller boot after voltage stabilization. |
Use Scenario: Off-highway vehicle telematics unit operating in −40°C to +105°C ambient with intermittent 12V supply. IC Role / Device Role / Timing Role: Automotive-grade boost controller with AEC-Q100 qualification; INTVCC powers MCU and CAN transceiver directly. Use Value: Delivers 3A @ 24V with <1µA shutdown current, extending battery life during 30-day parking mode. |
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, no SPI programming; fixed 5V INTVCC; no phase shedding or CLKOUT sync capability. | Suitable for lower-power (<60W), cost-sensitive designs where digital control and multichip scaling are unnecessary. | Select LTC3891EUFD#PBF only if output power ≤60W and fixed 5V/12V output suffices; lacks LT8277RUDCM#WPBF's programmability and scalability. |
| MPQ4332GJ-AEC1-Z | Monolithic 2-phase boost IC (integrated MOSFETs); max 40V input; no SPI interface; fixed 3.3V/5V/12V outputs. | Targeted at space-constrained modules where board area > flexibility; limited to 3.3–12V outputs, no 60V capability. | Choose MPQ4332GJ-AEC1-Z for compact, low-component-count designs up to 40W; not suitable for 60V or SPI-configurable systems. |
Compared with LTC3891EUFD#PBF and MPQ4332GJ-AEC1-Z, the LT8277RUDCM#WPBF uniquely combines AEC-Q100 qualification, SPI-programmable 9–60V output, multichip CLKOUT synchronization, and automatic phase shedding-making it the only option for scalable, high-voltage automotive pre-boost systems requiring dynamic configuration and EMI compliance.
Availability
LT8277RUDCM#WPBF is available at Aetrix Electronics and suitable for automotive ADAS pre-boost, industrial telecom power supplies, and ruggedized sensor hub designs requiring stable component supply, long-term lifecycle support, and AEC-Q100 traceability.
Supply support for LT8277RUDCM#WPBF 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, serving automotive, industrial, communications, and healthcare markets.
The LT8277RUDCM#WPBF belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered specifically for high-efficiency, high-reliability automotive pre-boost and industrial step-up power conversion with digital configurability and multichip scalability.
FAQ
What is the maximum output voltage programmable via SPI on the LT8277RUDCM#WPBF?
The LT8277RUDCM#WPBF supports SPI-programmable output voltages from 9V to 60V in 1V steps, corresponding to a 7-bit field (bits 6–0) in the 12-bit SPI command word. This range is confirmed in the datasheet's VOUT specification table and Figure 5 (VOUT vs. SPI code), where code 0x00 yields 9V and code 0x7D yields 60V. The LT8277RUDCM#WPBF maintains ±2% regulation accuracy across this full range at temperature.
Does the LT8277RUDCM#WPBF require external components for basic operation?
Yes - the LT8277RUDCM#WPBF requires external NMOS power switches, current-sense resistors, inductors, input/output capacitors, and an RT resistor to set switching frequency. It does not integrate power FETs. However, it integrates a 5V LDO (INTVCC), error amplifier, gate drivers, and SPI interface, eliminating need for external bias rails or DACs. The LT8277RUDCM#WPBF datasheet Figure 1 shows a complete 180W automotive pre-boost reference design using only discrete passives and MOSFETs.
How does the LT8277RUDCM#WPBF handle thermal overload conditions?
The LT8277RUDCM#WPBF includes internal overtemperature protection that forces shutdown when junction temperature exceeds 150°C. During thermal fault, GATE1 and GATE2 are pulled low, INTVCC is disabled, and PGOOD deasserts. Recovery occurs automatically once die temperature falls below the hysteresis threshold (~140°C). This behavior is specified in Absolute Maximum Ratings Table 2 and confirmed in the Thermal Protection section of the datasheet. The LT8277RUDCM#WPBF's exposed pad (Pin 21) must be soldered to PCB ground for effective thermal conduction.
Can the LT8277RUDCM#WPBF operate in SEPIC topology?
Yes - the LT8277RUDCM#WPBF is explicitly designed for both boost and SEPIC topologies, as stated in the datasheet Description section and Theory of Operation. Its dual-phase current-mode architecture, independent SNSP/SNSN inputs per phase, and ability to drive high-side NMOS switches make it compatible with SEPIC configurations using coupled inductors. The LT8277RUDCM#WPBF's MODE pin settings and soft-start behavior are validated for SEPIC use in Applications Information Section.
What is the purpose of the MODE pin on the LT8277RUDCM#WPBF?
The MODE pin on the LT8277RUDCM#WPBF selects the default VOUT at power-up and watchdog timer expiration: tied to GND disables the watchdog; tied to INTVCC/2 sets 36V; tied to INTVCC sets 60V. This hardware-selectable startup voltage eliminates reliance on SPI initialization during cold-boot sequences. The LT8277RUDCM#WPBF's MODE pin behavior is fully documented in Table 5 and Figure 6–7 of the datasheet, with temperature-stable regulation confirmed from −40°C to +125°C.
LT8277RUDCM#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tray
- 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#WPBF FAQ
1.How can I place an order for LT8277RUDCM#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8277RUDCM#WPBF 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#WPBF reliable?
The price and inventory of LT8277RUDCM#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8277RUDCM#WPBF is usually 5 days.
3.What payment methods are accepted for LT8277RUDCM#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8277RUDCM#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8277RUDCM#WPBF?
LT8277RUDCM#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8277RUDCM#WPBF 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#WPBF?
For technical support, including LT8277RUDCM#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8277RUDCM#WPBF requirements.
6.How does Aetrix verify that LT8277RUDCM#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8277RUDCM#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8277RUDCM#WPBF?
All LT8277RUDCM#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8277RUDCM#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8277RUDCM#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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