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Analog Devices Inc. LTC7802IUFDM#WTRPBF
- Part No.:
- LTC7802IUFDM#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802IUFDM#WTRPBF.pdf
- Description:
- 40V, LOW IQ DUAL PHSE SYCH STP-D
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
LTC7802IUFDM#WTRPBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller driving all-N-channel MOSFETs for high-efficiency 4.5V–40V input systems. It delivers two independent outputs (0.8V to 99% VIN), operates up to 3MHz with phase-lockable frequency, and features 14μA no-load quiescent current and spread-spectrum EMI reduction - ideal for automotive infotainment power rails and industrial dual-rail supplies.
For engineers reviewing the LTC7802IUFDM#WTRPBF datasheet, LTC7802IUFDM#WTRPBF pinout, LTC7802IUFDM#WTRPBF application, or LTC7802IUFDM#WTRPBF equivalent, key selection criteria include out-of-phase dual-channel operation, RSENSE/DCR current sensing, OPTI-LOOP compensation, 0.8V precision reference, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7802IUFDM#WTRPBF implements constant-frequency peak-current-mode control with two independent 180° out-of-phase channels, reducing input ripple and required bulk capacitance. Its dual-loop architecture integrates error amplifiers (EA), transconductance gm = 1.8 mmho, and programmable ITH-based current limit thresholds (45–55 mV) per channel.
It supports three light-load modes via the MODE pin: Burst Mode® (14μA IQ), pulse-skipping, or forced continuous conduction - each selectable without external components. Spread-spectrum dithering (±12% to ±15% around fOSC) is enabled by pulling PLLIN/SPREAD to INTVCC, directly lowering conducted and radiated EMI peaks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports 12V/24V/36V automotive and industrial bus inputs without pre-regulation. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Ch1 on) - enables >1-year battery runtime in always-on vehicle modules. |
| Switching Frequency Range | 100kHz to 3MHz, programmable via FREQ pin resistor - allows optimization of size (high-f) vs. efficiency (low-f). |
| Feedback Reference Voltage | 0.800V ±12mV (0°C–85°C) - enables precise output regulation across wide temperature and load ranges. |
| Current Sense Threshold | 50mV typical (±5mV matching between channels) - ensures accurate current limiting with minimal RSENSE power loss. |
| Duty Cycle Max | 99% at 350kHz - supports ultra-low dropout operation near VIN, critical for 3.3V/5V rails from 5V or 12V sources. |
| Operating Junction Temp | –40°C to +125°C - qualified per AEC-Q100 Grade I for under-hood automotive applications. |
Pinout & Package
Package: 28-lead 4mm × 5mm QFN with exposed thermal pad (Pin 29 = GND), side-wettable leads for automated optical inspection (AOI). RoHS-compliant, halogen-free, and qualified for automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense positive input | Connects to high-side of RSENSE or DCR network; sets current trip point with ITH voltage. |
| SENSE1–, SENSE2– | Differential current sense negative input | Sinks bias current above 3.2V; reduces VIN-referred IQ in sleep mode when ≥3.2V. |
| TG1, TG2 | Top N-MOSFET gate drive output | Floating driver with INTVCC-referenced swing; requires BOOSTx–SWx bootstrap capacitor. |
| BG1, BG2 | Bottom N-MOSFET gate drive output | GND-referenced driver (0V to INTVCC); synchronizes with TG off-time for shoot-through prevention. |
| VFB1, VFB2 | Output voltage feedback input | Resistor divider from VOUT sets regulation point; VFB2 tied to INTVCC enables 2-phase single-output mode. |
| TRACK/SS1, TRACK/SS2 | Soft-start / tracking voltage input | Internal 12.5μA pull-up ramps voltage; 10nF → 0.65ms ramp time; enables controlled startup or supply tracking. |
| PLLIN/SPREAD | Sync clock input / spread-spectrum enable | Pull to INTVCC for EMI-reducing dither; apply external clock (0.1–3MHz) for system-level synchronization. |
| RUN1, RUN2 | Channel enable control | Below 1.1V disables channel; both <0.7V → full shutdown (1.5μA IQ); tolerant to 40V max. |
| MODE | Light-load operation mode select | GND = Burst Mode; INTVCC = forced continuous; 100k to INTVCC = pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input ripple by ~30% and cuts required input capacitance by ~50% vs. in-phase controllers. |
| OPTI-LOOP™ compensation | Enables stable loop response across wide range of output capacitors (ceramic, polymer, electrolytic) and ESR values without redesign. |
| Spread-spectrum modulation | Reduces peak EMI by >10dB across 100kHz–1GHz band - simplifies compliance with CISPR 25 Class 5. |
| Programmable light-load behavior | Three distinct modes (Burst/Pulse-Skip/Continuous) selected via single MODE pin - no external logic needed. |
| Integrated 5.1V INTVCC LDO | Supplies gate drivers and internal circuitry; switchover to EXTVCC ≥4.7V improves efficiency by bypassing VIN LDO losses. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with HTOL, TC, ESD, and AC/DC stress testing - suitable for front-end ADAS power supplies. |
Applications
| Automotive Infotainment Power | Industrial Dual-Rail CPU Core Supply |
|---|---|
Use Scenario: Powering SoC core (1.0V/8A) and I/O (1.8V/4A) rails from 12V battery in head unit. IC Role / Device Role / Timing Role: Dual-phase buck controller managing two independent regulated outputs with synchronized switching and shared thermal design. Use Value: Out-of-phase operation minimizes input capacitor stress; 14μA IQ extends battery backup time during ignition-off; AEC-Q100 ensures reliability in vibration/temperature-cycled environments. |
Use Scenario: Generating 3.3V/12A and 5V/10A from 24V factory automation PLC supply. IC Role / Device Role / Timing Role: High-voltage dual-controller enabling compact, low-noise power delivery with programmable frequency (350kHz–3MHz) for EMI filtering flexibility. Use Value: Spread-spectrum mode meets EN 55032 Class B emissions; RSENSE/DCR sensing accommodates legacy inductor designs; 99% duty cycle supports brownout operation down to 5.5V input. |
| Avionics Display Backlight Driver | Telecom Base Station Bias Supply |
Use Scenario: Driving LED backlight arrays requiring tightly regulated 24V/2A and 5V/1A from 28V aircraft bus. IC Role / Device Role / Timing Role: Dual-output controller with independent TRACK/SS pins enabling staggered soft-start to limit inrush into large display capacitors. Use Value: Precision 0.8V reference (±1.5%) ensures <±1% output tolerance; PGOOD1/PGOOD2 provide fault isolation for safety-critical displays; 125°C rating suits enclosed avionics enclosures. |
Use Scenario: Providing isolated 3.3V/6A and 12V/3A bias rails for RF transceiver modules in 48V telecom rectifier systems. IC Role / Device Role / Timing Role: High-input-voltage controller operating from intermediate 48V bus with programmable frequency to avoid sensitive RF bands. Use Value: Phase-lockable fOSC allows synchronization to system clock, eliminating beat frequencies; EXTVCC switchover enables efficient use of downstream 12V rail to power INTVCC. |
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 |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual-phase controller with integrated MOSFET drivers only (no external FET support); fixed 500kHz fOSC; no spread spectrum. | Targeted at cost-sensitive consumer power; lacks AEC-Q100, 40V rating, and programmable frequency. | Select LTC7802IUFDM#WTRPBF when external N-FETs, >24V input, EMI compliance, or automotive qualification are required. |
| LTC3892EUFDM#PBF | Pin-compatible dual-phase controller but with higher IQ (35μA), no spread spectrum, and no AEC-Q100 qualification; same 4mm×5mm QFN package. | Designed for general industrial use; not validated for automotive temperature cycling or humidity testing. | LTC7802IUFDM#WTRPBF offers 2.5× lower IQ, integrated EMI reduction, and certified automotive reliability - preferred for Tier-1 automotive designs. |
Compared with MP2918GL-Z and LTC3892EUFDM#PBF, the LTC7802IUFDM#WTRPBF uniquely combines AEC-Q100 qualification, 14μA IQ, spread-spectrum EMI suppression, and full 4.5V–40V operation - making it the only option qualified for demanding automotive front-end power conversion where efficiency, noise, and reliability are co-constrained.
Availability
LTC7802IUFDM#WTRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, avionics displays, and telecom base station power supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LTC7802IUFDM#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, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC7802 belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, low-EMI, multi-phase DC/DC conversion in space-constrained and thermally demanding automotive and industrial applications.
FAQ
What is the maximum input voltage rating for the LTC7802IUFDM#WTRPBF?
The LTC7802IUFDM#WTRPBF has an absolute maximum input supply voltage (VIN) of 40V, with recommended operating range from 4.5V to 40V. This rating is verified across the full –40°C to +125°C junction temperature range and supports direct connection to 24V and 36V industrial or automotive buses without external protection circuitry.
Does the LTC7802IUFDM#WTRPBF support spread-spectrum operation, and how is it enabled?
Yes, the LTC7802IUFDM#WTRPBF supports hardware-enabled spread-spectrum modulation to reduce EMI peaks. It is activated by connecting the PLLIN/SPREAD pin to INTVCC (typically 5.1V); grounding this pin disables spread spectrum, while applying an external clock enables synchronization instead.
What package type and thermal characteristics does the LTC7802IUFDM#WTRPBF use?
The LTC7802IUFDM#WTRPBF uses a 28-lead 4mm × 5mm side-wettable QFN package with exposed thermal pad (Pin 29 = GND). Its thermal resistance is θJA = 43°C/W (JEDEC standard board), and the exposed pad must be soldered to PCB ground for rated electrical performance and thermal dissipation.
How does the MODE pin configure light-load operation on the LTC7802IUFDM#WTRPBF?
The MODE pin of the LTC7802IUFDM#WTRPBF selects among three light-load behaviors: grounded = Burst Mode® (14μA IQ), tied to INTVCC = forced continuous conduction, and pulled to INTVCC via 100kΩ = pulse-skipping. No external logic or timing components are required for any mode.
Is the LTC7802IUFDM#WTRPBF qualified for automotive applications, and what grade does it meet?
Yes, the LTC7802IUFDM#WTRPBF is explicitly qualified per AEC-Q100 Grade I (–40°C to +125°C), with full reliability test reports available. The "#W" suffix in the part number denotes automotive-grade manufacturing control, including enhanced process monitoring and lot traceability.
LTC7802IUFDM#WTRPBF 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:
- Transistor Driver
- 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):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LTC7802IUFDM#WTRPBF FAQ
1.How can I place an order for LTC7802IUFDM#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802IUFDM#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 LTC7802IUFDM#WTRPBF reliable?
The price and inventory of LTC7802IUFDM#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7802IUFDM#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC7802IUFDM#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802IUFDM#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802IUFDM#WTRPBF?
LTC7802IUFDM#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802IUFDM#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 LTC7802IUFDM#WTRPBF?
For technical support, including LTC7802IUFDM#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802IUFDM#WTRPBF requirements.
6.How does Aetrix verify that LTC7802IUFDM#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7802IUFDM#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 LTC7802IUFDM#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC7802IUFDM#WTRPBF?
All LTC7802IUFDM#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802IUFDM#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 LTC7802IUFDM#WTRPBF part is unused and in its original packaging.
Return procedure for LTC7802IUFDM#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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