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Analog Devices Inc. LTC7805RUFDM#TRPBF
- Part No.:
- LTC7805RUFDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7805RUFDM#TRPBF.pdf
- Description:
- 40V DUAL LOW IQ, 100% DC SYNC BU
- Quantity:
- Payment:
- Shipping:
Inventory:2,361
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Product details
Overview
LTC7805RUFDM#TRPBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4.5V to 40V input, delivers 0.8V–40V output per channel, supports 100% duty cycle, and achieves ultra-low 14μA no-load quiescent current-enabling extended battery runtime in automotive infotainment power supplies.
For engineers reviewing the LTC7805RUFDM#TRPBF datasheet, LTC7805RUFDM#TRPBF pinout, LTC7805RUFDM#TRPBF application, or LTC7805RUFDM#TRPBF equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input capacitance, spread spectrum EMI reduction, OPTI-LOOP compensation for wide output capacitor/ESR tolerance, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7805RUFDM#TRPBF implements constant-frequency peak current-mode control with two independent 180° out-of-phase channels, enabling interleaved operation that halves input ripple current and reduces required bulk capacitance. Its dual-stage architecture supports both independent dual-output and 2-phase single-output configurations via VFB2-to-INTVCC connection.
It integrates a programmable 100kHz–3MHz oscillator with phase-lock capability (PLLIN/SPREAD pin), spread spectrum dithering (±20% frequency modulation), and three selectable light-load modes-Burst Mode (14μA IQ), pulse-skipping, or forced continuous conduction-controlled by the MODE pin. Internal 5.4V INTVCC LDO powers gate drivers and logic, with EXTVCC switchover at 4.7V for efficiency optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports 12V/24V/36V automotive and industrial bus systems without pre-regulation. |
| Output Voltage Range | 0.8V to 40V per channel - enables direct generation of core, I/O, and auxiliary rails from wide-input sources. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Ch1 active) - extends battery life in always-on vehicle modules like telematics and ADAS sensors. |
| Switching Frequency | Programmable 100kHz–3MHz or PLL-synchronized - allows EMI-sensitive designs to shift noise away from critical bands. |
| Current Sense Threshold | 50mV typical (±3.5mV inter-channel match) - enables accurate, low-loss RSENSE or DCR sensing with minimal power loss. |
| Reference Voltage Accuracy | ±1.5% over –40°C to 150°C - ensures stable output regulation across automotive under-hood temperature extremes. |
| Shutdown Current | 1.5μA - meets stringent automotive sleep-mode requirements for zero-power standby states. |
| Package | 28-lead 4mm × 5mm QFN with exposed GND pad - provides low thermal resistance (θJA = 43°C/W) for high-current automotive applications. |
Pinout & Package
28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), rated for –40°C to 150°C junction temperature and AEC-Q100 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense inputs (+) | Interface with RSENSE or DCR networks; set current limit threshold jointly with ITH voltage and offset. |
| SENSE1–, SENSE2– | Differential current sense inputs (–) | Supply bias current when ≥3.2V; enable VIN-current reduction in sleep mode by sourcing quiescent current externally. |
| TG1, TG2 | Top N-MOSFET gate drivers | Floating outputs swinging from SW node to (SW + INTVCC); drive high-side switches with 1.2Ω pull-up / 0.6Ω pull-down. |
| BG1, BG2 | Bottom N-MOSFET gate drivers | GND-referenced outputs swinging 0V to INTVCC; provide synchronous rectification with 15ns dead-time control. |
| VFB1, VFB2 | Feedback inputs | Compare output divider voltage to 0.8V reference; tie VFB2 to INTVCC to configure 2-phase single-output mode. |
| TRACK/SS1, TRACK/SS2 | Soft-start & tracking inputs | Internal 12.5μA current source ramps voltage; sets output ramp rate (0.65ms/10nF) or enables supply tracking via external divider. |
| MODE | Light-load operation selector | GND = Burst Mode (14μA IQ); INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping. |
| PLLIN/SPREAD | Sync input / spread spectrum control | External clock → PLL lock; INTVCC → spread spectrum dithering; GND → fixed-frequency operation. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low if VOUT deviates >±10% from regulation point; support system sequencing and fault reporting. |
| RUN1, RUN2 | Channel enable controls | <1.1V disables channel; <0.7V shuts down entire IC (1.5μA IQ); tolerate up to 40V - simplifies direct VIN tie-off. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces input RMS ripple current by ~70%, cutting required input capacitance and easing EMI filter design. |
| Spread spectrum modulation | ±20% frequency dithering lowers peak conducted/radiated EMI, easing compliance with CISPR 25 Class 5 automotive standards. |
| OPTI-LOOP compensation | Enables stable loop response across 10μF–1000μF output capacitors and 0.5mΩ–50mΩ ESR - eliminates custom compensation per design. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with full production testing - suitable for engine control, ADAS, and body electronics. |
| PassThru™ 100% duty cycle | Allows seamless dropout operation during cold-crank events (e.g., 5.5V input → 5V output), preventing system brownout. |
| Multi-source bias (VIN/EXTVCC) | Automatic switchover to EXTVCC ≥4.7V powers INTVCC from regulated output rail - improves overall system efficiency by >2%. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (1.1V core, 3.3V I/O) and display backlight (12V) in head-unit systems operating from 9V–16V battery. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching, soft-start sequencing, and power-good signaling to MCU. Use Value: 14μA no-load IQ extends parking-mode runtime; AEC-Q100 rating ensures reliability under hood vibration and thermal cycling. | Use Scenario: 24V industrial bus-powered module requiring isolated 5V logic rail and 12V analog sensor supply with tight load transient response. IC Role / Device Role / Timing Role: Dual-output controller delivering independent, tightly regulated rails with out-of-phase operation minimizing input capacitor stress. Use Value: 0.8V reference accuracy ±1.5% maintains ADC reference stability; spread spectrum reduces conducted noise on shared 24V backplane. |
| Avionics Flight Control Unit | Electric Vehicle Battery Management |
Use Scenario: Redundant 28V-to-5V/3.3V conversion in flight-critical actuator controllers where EMI immunity and thermal robustness are paramount. IC Role / Device Role / Timing Role: Dual-channel controller configured in 2-phase single-output mode for high-current 5V rail, with PGOOD monitoring and thermal shutdown. Use Value: 150°C max junction temperature supports conduction-cooled enclosures; 1.5μA shutdown IQ meets DO-160 lightning-induced transient power budget limits. | Use Scenario: Auxiliary power supply in BMS master controller, converting 48V battery pack voltage to 3.3V MCU rail and 12V CAN transceiver rail. IC Role / Device Role / Timing Role: Wide-input buck controller supporting cold-crank (4.5V min) and load-dump (40V max) conditions while maintaining regulation. Use Value: 100% duty cycle PassThru™ prevents MCU reset during cranking; RSENSE/DCR sensing enables precise current monitoring for fuseless protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7803RUFDM#TRPBF | Single-channel, 4.5V–40V input, 0.8V–40V output, 14μA IQ, but lacks second channel and out-of-phase capability. | Suitable only for single-rail systems; cannot replace LTC7805RUFDM#TRPBF in dual-output or interleaved high-current designs. | Select when only one regulated rail is needed and board space/cost must be minimized. |
| MPQ8645PGU-AEC1-Z | Monolithic dual-channel buck (integrated MOSFETs), 3.5V–36V input, 0.6V–12V output, 25μA IQ, no spread spectrum or 100% duty cycle. | Lower BOM count but limited output voltage range and no PassThru™; not qualified for >125°C ambient. | Choose for cost-sensitive, lower-power (<10A/channel) automotive modules where integration outweighs flexibility. |
Compared with LTC7803RUFDM#TRPBF and MPQ8645PGU-AEC1-Z, the LTC7805RUFDM#TRPBF uniquely combines dual independent channels, 100% duty cycle, spread spectrum, and AEC-Q100 Grade 1 qualification - making it the only option for high-reliability, wide-input, multi-rail automotive power systems requiring EMI control and cold-crank resilience.
Availability
LTC7805RUFDM#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and avionics flight control units requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LTC7805RUFDM#TRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC7805 product line delivers high-efficiency, low-quiescent-current, dual-phase synchronous buck controllers engineered specifically for demanding automotive and industrial power systems requiring wide input range, EMI robustness, and extended temperature operation.
FAQ
What is the maximum switching frequency supported by the LTC7805RUFDM#TRPBF?
The LTC7805RUFDM#TRPBF supports a maximum switching frequency of 3MHz when configured with an external resistor on the FREQ pin or synchronized via the PLLIN/SPREAD pin. Its internal oscillator can be programmed from 100kHz to 3MHz, and the phase-locked loop accepts external clocks from 0.1MHz to 3MHz - enabling precise EMI band avoidance in automotive and industrial environments. This 3MHz capability allows use of smaller magnetics and capacitors in space-constrained designs.
How does the LTC7805RUFDM#TRPBF achieve ultra-low quiescent current in battery-powered systems?
The LTC7805RUFDM#TRPBF achieves 14μA no-load quiescent current through multiple integrated techniques: Burst Mode operation at light loads, automatic current sourcing from SENSE1– when ≥3.2V (reducing VIN-referred IQ), and dual-channel sleep mode coordination. When both channels enter sleep, total IQ drops to just 18μA; full shutdown draws only 1.5μA. These features are validated across –40°C to 150°C, making LTC7805RUFDM#TRPBF ideal for automotive telematics and ADAS sensors requiring multi-year battery life.
Can the LTC7805RUFDM#TRPBF operate with 100% duty cycle, and what is its practical use case?
Yes, the LTC7805RUFDM#TRPBF supports true 100% duty cycle (PassThru™ mode) to maintain regulation during low-input conditions such as automotive cold-crank events (e.g., 5.5V input sustaining 5V output). This is implemented via internal charge-pump bootstrapping and adaptive bottom-FET timing extension. In practice, this prevents system brownout in engine start scenarios - a critical requirement for infotainment head-units and body control modules where uninterrupted operation is mandated.
What package type and thermal performance does the LTC7805RUFDM#TRPBF use?
The LTC7805RUFDM#TRPBF uses a 28-lead 4mm × 5mm plastic QFN package with exposed GND pad (Pin 29), designed for high thermal conductivity and AEC-Q100 compliance. Its thermal resistance is θJA = 43°C/W (JEDEC standard PCB), enabling reliable operation at 150°C junction temperature. The exposed pad must be soldered to PCB ground for rated electrical and thermal performance - ensuring robust power delivery in under-hood automotive applications and high-density industrial power supplies.
Does the LTC7805RUFDM#TRPBF support synchronization to an external clock, and how is it configured?
Yes, the LTC7805RUFDM#TRPBF supports external clock synchronization via the PLLIN/SPREAD pin. Applying a clean square wave (0.1MHz–3MHz) to this pin locks the rising edge of TG1 to the external clock's rising edge, enabling deterministic timing across multiple converters. When synchronizing, the device operates in pulse-skipping or forced continuous mode depending on the MODE pin setting. This capability is essential for noise-sensitive systems like radar modules and camera ISPs where switching frequency alignment prevents beat-frequency interference.
LTC7805RUFDM#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Adjustable
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Power Good
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LTC7805RUFDM#TRPBF FAQ
1.How can I place an order for LTC7805RUFDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7805RUFDM#TRPBF 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 LTC7805RUFDM#TRPBF reliable?
The price and inventory of LTC7805RUFDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7805RUFDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7805RUFDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7805RUFDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7805RUFDM#TRPBF?
LTC7805RUFDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7805RUFDM#TRPBF 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 LTC7805RUFDM#TRPBF?
For technical support, including LTC7805RUFDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7805RUFDM#TRPBF requirements.
6.How does Aetrix verify that LTC7805RUFDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7805RUFDM#TRPBF 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 LTC7805RUFDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7805RUFDM#TRPBF?
All LTC7805RUFDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7805RUFDM#TRPBF, 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 LTC7805RUFDM#TRPBF part is unused and in its original packaging.
Return procedure for LTC7805RUFDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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