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Analog Devices Inc. LTC7802EUFDM-3.3#TRPBF
- Part No.:
- LTC7802EUFDM-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802EUFDM-3.3#TRPBF.pdf
- Description:
- 40V LOW IQ DUAL BUCK CTL W/ 3.3V
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
LTC7802EUFDM-3.3 from Analog Devices is a dual-phase, synchronous step-down DC/DC controller IC driving all-N-channel MOSFET stages, featuring fixed 3.3V output on Channel 1, 4.5V–40V input range, 12μA no-load quiescent current, 3MHz max switching frequency, and integrated spread spectrum EMI reduction. It enables high-efficiency power conversion in automotive infotainment and industrial motor control systems requiring tight voltage regulation and low standby power.
For engineers reviewing the LTC7802EUFDM-3.3 datasheet, LTC7802EUFDM-3.3 pinout, LTC7802EUFDM-3.3 application, or LTC7802EUFDM-3.3 equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input capacitance, OPTI-LOOP compensation compatibility with diverse output capacitors, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and AEC-Q100 qualification for automotive deployment.
Technical Context
The LTC7802EUFDM-3.3 implements a constant-frequency peak-current-mode architecture with two independent 180° out-of-phase controllers, enabling interleaved operation that halves input ripple current and reduces required bulk capacitance. Its dual-channel design supports independent enable (RUN1/RUN2), feedback (VOUT1/VFB2), and soft-start (TRACK/SS1/SS2) control.
It integrates a precision 0.8V reference, internal 5.1V INTVCC LDO powered from VIN or EXTVCC, programmable oscillator (100kHz–3MHz), and spread spectrum dithering via PLLIN/SPREAD pin. The device features RSENSE or DCR current sensing, output overvoltage protection, and 99% duty cycle capability for ultra-low dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
| Channel 1 Output Voltage | Fixed 3.3V ±1.5% - factory-trimmed for stable logic supply generation without external resistor divider. |
| No-Load Quiescent Current | 12μA (14V→3.3V, Ch1 active) - extends runtime in always-on battery-powered systems like telematics modules. |
| Max Switching Frequency | 3MHz - enables use of small, low-profile inductors and ceramic capacitors in space-constrained designs. |
| Spread Spectrum Enable | Enabled via PLLIN/SPREAD = INTVCC - reduces peak conducted/radiated EMI by ±12% frequency dithering, easing CISPR 25 Class 5 compliance. |
| Shutdown Current | 1.5μA - achieved when both RUN1 and RUN2 < 0.7V, critical for ultra-low-power sleep states in ADAS ECUs. |
| Package | 28-pin 4mm × 5mm QFN with exposed thermal pad - provides low θJA (43°C/W) and side-wettable leads for automated optical inspection (AOI). |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN (UFDM), exposed pad (Pin 29) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense positive inputs | Interface with RSENSE or DCR networks to set channel-specific current limit thresholds (typ. 50mV full-scale). |
| RUN1, RUN2 | Independent channel enable inputs | Logic-level control (1.2V threshold) allowing staggered startup or fault-isolated shutdown per channel. |
| VOUT1, VFB2 | Channel 1 fixed-feedback / Channel 2 adjustable feedback | VOUT1 directly connects to 3.3V rail; VFB2 accepts resistor divider to set VOUT2 from 0.8V to 99%×VIN. |
| PLLIN/SPREAD | External sync input / Spread spectrum select | Tie to INTVCC for EMI-reducing dithering; tie to external clock for phase-locking across multiple controllers. |
| MODE | Light-load operation mode selector | GND = Burst Mode (ultra-low IQ); INTVCC = Forced Continuous (low noise); 100k-to-INTVCC = Pulse-Skipping (balanced). |
| PGOOD1, PGOOD2 | Open-drain power-good status outputs | Assert low if output deviates >±10% from regulation point - used for system sequencing and fault reporting. |
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. |
| OPTI-LOOP compensation | Enables stable loop response across wide ranges of output capacitor ESR (0.5mΩ–100mΩ) and capacitance (10μF–1000μF). |
| Internal 5.1V INTVCC LDO with EXTVCC switchover | Derives gate drive power from high-efficiency output rails (e.g., 5V channel), reducing total system power loss. |
| 99% maximum duty cycle | Supports ultra-low dropout operation (e.g., 12V→11.8V), critical for post-regulation in high-voltage automotive systems. |
| AEC-Q100 Grade E qualification | Rated for –40°C to +125°C junction temperature - validated for under-hood automotive applications including body control modules. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
|
Use Scenario: Dual-rail power for SoC (3.3V) and FPGA (5V) in head-unit systems with 9V–16V battery input and strict CISPR 25 EMI limits. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent 3.3V/5V outputs with interleaved switching and spread spectrum. Use Value: 12μA quiescent current preserves battery during vehicle sleep; 3MHz operation allows compact 2.2μH inductors; AEC-Q100 ensures reliability. |
Use Scenario: High-efficiency, isolated 3.3V/5V supplies for analog sensor interfaces and digital logic in DIN-rail mounted PLCs operating from 24VDC industrial bus. IC Role / Device Role / Timing Role: Dual-channel controller delivering regulated outputs with out-of-phase timing to minimize shared input impedance effects. Use Value: 4.5V–40V input range accommodates brownout conditions; OPTI-LOOP ensures stability with electrolytic bulk caps; PGOOD signals enable diagnostics. |
| Avionics Display Backlight Driver | Medical Imaging Sensor Bias Supply |
|
Use Scenario: Compact, low-noise 3.3V supply for display controller ASICs in cockpit displays, where EMI must meet DO-160 Section 20 Level A requirements. IC Role / Device Role / Timing Role: Fixed-output buck controller using spread spectrum and pulse-skipping to suppress narrowband emissions at fundamental and harmonic frequencies. Use Value: Spread spectrum reduces peak radiated emissions by >10dB; 1.5μA shutdown current meets avionics standby power budgets. |
Use Scenario: Ultra-stable, low-ripple 3.3V bias for CMOS image sensor arrays in portable ultrasound devices powered from single-cell Li-ion (3.0V–4.2V). IC Role / Device Role / Timing Role: Dual-phase controller operating in forced continuous mode to eliminate low-frequency switching artifacts in analog signal paths. Use Value: 0.8V reference accuracy (±1.5%) ensures precise sensor bias; 99% duty cycle supports operation down to 3.33V input during battery discharge. |
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 | Fixed 3.3V/5V dual output; no spread spectrum; 2.2MHz max fSW; 20μA IQ; QFN-24 package | Lacks AEC-Q100 qualification and EMI dithering - suitable for cost-sensitive industrial but not automotive EMI-critical designs | Select MP2918GL-Z only when spread spectrum and automotive qualification are unnecessary and board space permits larger package footprint. |
| ISL78234ARZ-T7A | 3.3V/5V dual output; AEC-Q100 Grade 1; 2.1MHz max fSW; 25μA IQ; no OPTI-LOOP; TQFN-32 package | Higher IQ and no adaptive compensation - requires tighter capacitor tolerance and increases design iteration time for stability validation | Choose ISL78234ARZ-T7A only when legacy Renesas ecosystem integration is required and spread spectrum is handled externally. |
Compared with MP2918GL-Z and ISL78234ARZ-T7A, the LTC7802EUFDM-3.3 uniquely combines AEC-Q100 qualification, 12μA IQ, spread spectrum, and OPTI-LOOP in a 4mm×5mm QFN-enabling robust, compact, and EMI-compliant dual-rail designs without stability trade-offs.
Availability
LTC7802EUFDM-3.3 is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, and avionics display systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC7802EUFDM-3.3 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 precision instrumentation, communications, and automotive markets since 1965.
The LTC7802 product line delivers high-efficiency, low-quiescent-current dual-phase synchronous buck controllers optimized for automotive, industrial, and aerospace applications demanding wide input range, EMI robustness, and extended temperature operation.
FAQ
What is the exact output voltage tolerance of the fixed 3.3V rail on LTC7802EUFDM-3.3?
The LTC7802EUFDM-3.3 features a factory-trimmed Channel 1 output voltage of 3.3V with ±1.5% tolerance over full temperature and line/load conditions, specified as 3.25V to 3.35V in the Electrical Characteristics table. This tight tolerance eliminates need for external feedback resistors and ensures reliable logic-level compatibility in automotive microcontroller interfaces.
Does LTC7802EUFDM-3.3 support synchronization to an external clock source?
Yes, the LTC7802EUFDM-3.3 supports external clock synchronization via the PLLIN/SPREAD pin. When an external clock signal (0.1MHz–3MHz) is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge, enabling deterministic timing across multiple controllers in distributed power systems.
How does the MODE pin configuration affect efficiency and noise in LTC7802EUFDM-3.3 light-load operation?
The MODE pin selects among three light-load strategies: GND enables Burst Mode (12μA IQ, lowest power, audible noise possible), INTVCC forces Continuous Conduction Mode (lowest output ripple, higher IQ), and 100k-to-INTVCC enables Pulse-Skipping (balanced efficiency/noise). Each setting directly alters switching behavior and gate drive activity in the LTC7802EUFDM-3.3.
Can LTC7802EUFDM-3.3 operate with only one channel enabled while maintaining full specification compliance?
Yes, the LTC7802EUFDM-3.3 supports independent channel operation: pulling RUN2 low disables Channel 2 while Channel 1 maintains full performance-including 3.3V regulation, spread spectrum, and PGOOD1 assertion. Sleep-mode current drops to 5μA (VIN) or 18μA (EXTVCC-biased), preserving system-level efficiency during partial operation.
What thermal performance can be expected from the LTC7802EUFDM-3.3 in a standard 4-layer PCB layout?
In a typical 4-layer PCB with 2oz copper, 1in² thermal pad area, and 10cm² copper pour under the exposed pad, the LTC7802EUFDM-3.3 achieves θJA ≈ 43°C/W. At 12V input and 3.3V/10A output, junction temperature rise remains below 65°C ambient, well within its –40°C to +125°C operating range and supporting reliable automotive under-hood deployment.
LTC7802EUFDM-3.3#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:
- 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)
LTC7802EUFDM-3.3#TRPBF FAQ
1.How can I place an order for LTC7802EUFDM-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802EUFDM-3.3#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 LTC7802EUFDM-3.3#TRPBF reliable?
The price and inventory of LTC7802EUFDM-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7802EUFDM-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7802EUFDM-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802EUFDM-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802EUFDM-3.3#TRPBF?
LTC7802EUFDM-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802EUFDM-3.3#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 LTC7802EUFDM-3.3#TRPBF?
For technical support, including LTC7802EUFDM-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802EUFDM-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC7802EUFDM-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7802EUFDM-3.3#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 LTC7802EUFDM-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7802EUFDM-3.3#TRPBF?
All LTC7802EUFDM-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802EUFDM-3.3#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 LTC7802EUFDM-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC7802EUFDM-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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