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Analog Devices Inc. LTC7802JUFDM#WTRPBF
- Part No.:
- LTC7802JUFDM#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802JUFDM#WTRPBF.pdf
- Description:
- 40V, LOW IQ DUAL PHSE SYCH STP-D
- Quantity:
- Payment:
- Shipping:
Inventory:4,822
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Product details
Overview
LTC7802JUFDM#WTRPBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller driving all-N-channel MOSFETs for high-efficiency power conversion. It operates from 4.5V to 40V input, delivers up to 99% duty cycle, supports 100kHz–3MHz programmable switching frequency, and features spread spectrum EMI reduction. It is used in automotive infotainment power rails requiring low quiescent current and AEC-Q100 compliance.
For engineers reviewing the LTC7802JUFDM#WTRPBF datasheet, LTC7802JUFDM#WTRPBF pinout, LTC7802JUFDM#WTRPBF application, or LTC7802JUFDM#WTRPBF equivalent, key selection criteria include its dual-channel out-of-phase operation, 14μA no-load IQ, 0.8V precision reference, AEC-Q100 qualification, and side-wettable 28-lead QFN package with exposed thermal pad.
Technical Context
The LTC7802JUFDM#WTRPBF implements constant-frequency peak current mode control with two independent channels operating 180° out of phase to reduce input ripple and capacitor stress. Its OPTI-LOOP compensation architecture adapts transient response across wide output capacitance and ESR ranges without external tuning.
It integrates dual gate drivers (TG/BG) with 2Ω pull-up/pull-down resistance, internal 5.1V INTVCC LDO powered from VIN or EXTVCC (≥4.7V), and a dedicated spread spectrum oscillator synchronized via PLLIN/SPREAD pin. The MODE pin selects Burst Mode®, pulse-skipping, or forced continuous conduction at light loads - each with distinct efficiency/noise trade-offs.
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. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Ch1 on) - extends battery runtime in always-on vehicle modules. |
| Switching Frequency Range | 100kHz to 3MHz (programmable via FREQ pin resistor) - enables compact magnetics and noise shaping above AM band. |
| Feedback Reference Voltage | 0.800V ±12mV (0°C–85°C) - ensures tight output regulation across temperature for sensitive analog/digital loads. |
| Duty Cycle Max | 99% at 350kHz - maintains regulation during deep dropout (e.g., cold-crank 6V input to 5V output). |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
| Package | 28-lead 4mm × 5mm side-wettable QFN with exposed GND pad - enables automated optical solder inspection and robust thermal dissipation. |
Pinout & Package
28-lead plastic QFN (UFDM), 4mm × 5mm body, 0.5mm pitch, exposed thermal pad (Pin 29 = GND). Requires PCB soldering of exposed pad for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense inputs (+) | Interface with RSENSE or DCR networks; sets current limit threshold jointly with ITH voltage and SENSE– bias. |
| SENSE1–, SENSE2– | Differential current sense inputs (–) | Supplies sleep-mode current when ≥3.2V - reduces VIN-referred IQ by sourcing bias from output rail. |
| TG1, TG2 | Top N-MOSFET gate drivers | Floating outputs with INTVCC-referenced swing; drive bootstrap circuits for high-side switches. |
| BG1, BG2 | Bottom N-MOSFET gate drivers | GND-referenced outputs; sink/source >1A peak to ensure fast synchronous rectifier turn-on/off. |
| BOOST1, BOOST2 | Bootstrap supply nodes | Charge reservoirs for top-gate drivers; require Schottky diode + ceramic cap between BOOST and SW pins. |
| VFB1, VFB2 | Output voltage feedback inputs | Compare divider output to 0.8V reference; VFB2 tied to INTVCC configures 2-phase single-output mode. |
| ITH1, ITH2 | Error amplifier outputs | Set current limit threshold; connect RC network to ground for OPTI-LOOP compensation. |
| RUN1, RUN2 | Channel enable controls | Logic-level shutdown: <1.1V disables channel; both <0.7V enters 1.5μA shutdown state. |
| MODE | Light-load operation selector | Ground = Burst Mode®; INTVCC = forced CCM; 100k-to-INTVCC = pulse-skipping - no external logic required. |
| PLLIN/SPREAD | Synchronization & spread spectrum control | External clock input (0.1–3MHz) for phase-locking; tie to INTVCC for dithered operation, GND for fixed frequency. |
| FREQ | Internal oscillator programming | Resistor-to-GND sets fSW from 100kHz–3MHz; tie to INTVCC for 2.25MHz, GND for 350kHz. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low if VOUT deviates >±10% from regulation point - enables system sequencing and fault reporting. |
| TRACK/SS1, TRACK/SS2 | Soft-start & output tracking inputs | Internal 12.5μA current source ramps voltage; capacitor value sets start-up time (0.65ms/10nF). |
| VIN, EXTVCC, INTVCC | Power supply inputs/outputs | VIN powers internal LDO; EXTVCC ≥4.7V bypasses VIN LDO to improve efficiency; INTVCC = 5.1V ±2% regulated output. |
| GND (Pin 29) | Reference and thermal plane | Exposed pad must be soldered to PCB ground plane - essential for electrical integrity and thermal derating. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 180° out-of-phase controllers | Halves input RMS ripple current - reduces required bulk capacitance by ~30% and eases EMI filter design. |
| Spread spectrum modulation | ±12% frequency dithering - lowers peak conducted/radiated emissions to simplify CISPR 25 Class 5 compliance. |
| OPTI-LOOP compensation | Adapts loop gain to output capacitor ESR and capacitance - eliminates need for custom compensation per design. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation - meets automotive reliability requirements for engine control and ADAS subsystems. |
| Side-wettable QFN package | Enables AOI-compatible solder joint inspection - critical for zero-defect manufacturing in automotive electronics. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Dual-rail power for display processor (3.3V/12A) and audio codec (5V/10A) in head-unit under 12V battery supply with cold-crank transients. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent output voltages with out-of-phase switching to minimize input ripple. Use Value: 14μA no-load IQ extends standby time; 99% duty cycle sustains 5V output during 6V cold-crank; AEC-Q100 ensures field reliability. |
Use Scenario: Distributed 24V-to-5V/3.3V conversion for isolated digital I/O banks in modular PLC chassis with space-constrained layout. IC Role / Device Role / Timing Role: Dual-channel controller enabling compact, thermally balanced power stage using shared input caps and discrete MOSFETs. Use Value: Programmable 100kHz–3MHz fSW allows optimization for size (high-f) or efficiency (low-f); side-wettable QFN supports automated optical inspection. |
| Avionics Sensor Hub | EV Battery Management System |
|
Use Scenario: Powering MEMS inertial sensors and ADC front-end in flight control unit where EMI must meet DO-160 Section 20 Level A. IC Role / Device Role / Timing Role: Spread spectrum-enabled dual buck controller reducing peak EMI across 150kHz–108MHz band without added shielding. Use Value: Integrated PLLIN/SPREAD pin enables synchronization to master clock; 0.8V reference ensures <±1% output accuracy over temp. |
Use Scenario: Auxiliary power for BMS microcontroller and isolated CAN transceiver from 48V traction battery with strict thermal limits. IC Role / Device Role / Timing Role: High-input-voltage dual controller delivering 3.3V/5V rails with thermal derating support up to +150°C junction. Use Value: EXTVCC input allows efficient derivation of INTVCC from 5V rail - cuts total system IQ by >50% vs. VIN-only biasing. |
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 |
|---|---|---|---|
| LTC7803IUFD#PBF | Single-channel, 40V, 3MHz controller with identical pinout but no second channel or out-of-phase capability. | Used where only one high-current rail is needed; lacks dual-rail coordination and input ripple cancellation. | Select LTC7803 for cost-sensitive single-output designs; LTC7802JUFDM#WTRPBF remains optimal for dual-rail or ripple-sensitive systems. |
| MPQ8633BGLE-Z | Monolithic dual buck converter (integrated MOSFETs), 3.5V–36V input, 5A/channel, no spread spectrum or AEC-Q100 rating. | Targets space-constrained consumer/industrial apps; lacks 40V rating, programmable fSW, and automotive qualification. | Choose MPQ8633BGLE-Z for simplified layout with integrated FETs; LTC7802JUFDM#WTRPBF preferred for 40V+ inputs, thermal scalability, and automotive compliance. |
Compared with LTC7803IUFD#PBF and MPQ8633BGLE-Z, the LTC7802JUFDM#WTRPBF uniquely combines dual-channel 180° interleaving, AEC-Q100 Grade 1 qualification, spread spectrum EMI reduction, and 40V input capability - making it the only option for high-reliability dual-rail automotive power systems requiring extended input range and thermal robustness.
Availability
LTC7802JUFDM#WTRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O, avionics sensor hubs, and EV battery management systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7802JUFDM#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and aerospace markets since 1965.
The LTC7802 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability DC/DC conversion in demanding automotive and industrial environments with stringent EMI and thermal constraints.
FAQ
What is the maximum input voltage rating for the LTC7802JUFDM#WTRPBF?
The LTC7802JUFDM#WTRPBF has an absolute maximum input supply voltage (VIN) of 40V, with recommended operating range from 4.5V to 40V. This enables direct connection to 24V and 36V industrial buses and 12V automotive systems including cold-crank conditions down to 6V while maintaining regulation via 99% duty cycle operation.
How does the MODE pin configure light-load behavior in the LTC7802JUFDM#WTRPBF?
The MODE pin on the LTC7802JUFDM#WTRPBF selects among three light-load modes: grounding enables Burst Mode® for lowest IQ (14μA), tying to INTVCC forces continuous conduction, and connecting through a 100kΩ resistor to INTVCC selects pulse-skipping. Each mode directly affects efficiency, output ripple, and EMI profile without requiring external control logic.
Does the LTC7802JUFDM#WTRPBF support synchronization to an external clock?
Yes, the LTC7802JUFDM#WTRPBF supports external synchronization via the PLLIN/SPREAD pin, accepting clock inputs from 0.1MHz to 3MHz. When driven externally, the internal phase-locked loop aligns the rising edge of TG1 to the external clock's rising edge - enabling deterministic timing across multiple converters in noise-sensitive systems.
What is the purpose of the EXTVCC pin on the LTC7802JUFDM#WTRPBF?
The EXTVCC pin on the LTC7802JUFDM#WTRPBF provides an alternative input to the internal 5.1V INTVCC LDO. When EXTVCC ≥4.7V, it disables the VIN-powered LDO and supplies INTVCC instead - improving overall system efficiency by deriving bias power from a high-efficiency output rail rather than the main input.
Is the LTC7802JUFDM#WTRPBF qualified for automotive applications?
Yes, the LTC7802JUFDM#WTRPBF is AEC-Q100 qualified for Grade 1 (–40°C to +150°C junction temperature) and designated with the #W suffix for automotive use. It undergoes controlled manufacturing, extended reliability testing, and full automotive-grade documentation - making it suitable for engine control, ADAS, and infotainment systems.
LTC7802JUFDM#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LTC7802JUFDM#WTRPBF FAQ
1.How can I place an order for LTC7802JUFDM#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802JUFDM#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 LTC7802JUFDM#WTRPBF reliable?
The price and inventory of LTC7802JUFDM#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7802JUFDM#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC7802JUFDM#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802JUFDM#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802JUFDM#WTRPBF?
LTC7802JUFDM#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802JUFDM#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 LTC7802JUFDM#WTRPBF?
For technical support, including LTC7802JUFDM#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802JUFDM#WTRPBF requirements.
6.How does Aetrix verify that LTC7802JUFDM#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7802JUFDM#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 LTC7802JUFDM#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC7802JUFDM#WTRPBF?
All LTC7802JUFDM#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802JUFDM#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 LTC7802JUFDM#WTRPBF part is unused and in its original packaging.
Return procedure for LTC7802JUFDM#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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