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Analog Devices Inc. LTC7802EUFDM-3.3#PBF
- Part No.:
- LTC7802EUFDM-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802EUFDM-3.3#PBF.pdf
- Description:
- 40V LOW IQ DUAL BUCK CTL W/ 3.3V
- Quantity:
- Payment:
- Shipping:
Inventory:134
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Product details
Overview
LTC7802EUFDM-3.3 from Analog Devices is a high-performance dual-phase synchronous step-down DC/DC controller driving all-N-channel MOSFET stages, featuring fixed 3.3V output on Channel 1, 4.5V–40V input range, 3MHz max switching frequency, spread spectrum EMI reduction, and 12μA no-load quiescent current - deployed in automotive infotainment power rails and industrial dual-rail supplies.
For engineers reviewing the LTC7802EUFDM-3.3 datasheet, LTC7802EUFDM-3.3 pinout, LTC7802EUFDM-3.3 application, or LTC7802EUFDM-3.3 equivalent, key selection considerations include out-of-phase dual-channel operation for reduced input capacitance, OPTI-LOOP compensation for wide output capacitor/ESR tolerance, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and AEC-Q100 qualification for automotive use.
Technical Context
The LTC7802EUFDM-3.3 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 phase-lockable oscillator supports synchronization to external clocks from 100kHz to 3MHz, while spread spectrum dithering (enabled via PLLIN/SPREAD = INTVCC) lowers peak conducted and radiated EMI without sacrificing regulation accuracy.
Each channel integrates independent error amplifiers (ITH1/ITH2), precision 0.8V reference, and programmable current sensing (RSENSE or DCR). The internal 5.1V INTVCC LDO powers gate drivers and logic, with automatic switchover to EXTVCC when ≥4.7V applied - minimizing VIN supply current during sleep mode and enabling efficient self-biasing from regulated outputs.
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. |
| Channel 1 Output Voltage | Fixed 3.3V ±1.5% - factory-trimmed for direct microcontroller core/I/O rail generation without external feedback divider. |
| Max Switching Frequency | 3MHz - enables ultra-small magnetics and high-density PCB layout; programmable via FREQ pin resistor or PLL sync. |
| No-Load Quiescent Current | 12μA (VIN = 14V → 3.3V, Ch1 active) - extends battery runtime in always-on automotive modules. |
| Shutdown Current | 1.5μA - achieved when both RUN1/RUN2 < 0.7V; enables deep-sleep system states. |
| Current Sense Threshold | 50mV typical - sets overcurrent protection point; matched within ±3.5mV between channels for balanced interleaving. |
| Duty Cycle Limit | 99% - supports ultra-low dropout operation down to VIN − VOUT ≈ 0.1V at 350kHz. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN with exposed GND pad (Pin 29), side-wettable terminations, rated for –40°C to 125°C junction temperature (E-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense positive inputs | Interface directly to RSENSE or DCR network; set current limit threshold with ITH voltage and offset matching. |
| RUN1, RUN2 | Independent channel enable controls | Pull <1.1V to disable respective channel; pull both <0.7V for full shutdown (1.5μA IQ). |
| MODE | Light-load operation mode selector | GND = Burst Mode; INTVCC = forced continuous; 100k-to-INTVCC = pulse-skipping. |
| PLLIN/SPREAD | External sync input / spread spectrum control | Apply external clock for phase-locking; tie to INTVCC for EMI-reducing dithering; tie to GND to disable. |
| VOUT1, VFB2 | Channel 1 feedback (fixed 3.3V), Channel 2 feedback input | VOUT1 internally connected to 0.8V ref; VFB2 accepts external resistor divider to set VOUT2 from 0.8V to 99%×VIN. |
| TRACK/SS1, TRACK/SS2 | Soft-start and tracking control inputs | Internal 12.5μA pull-up enables linear ramp start-up; also accepts external voltage divider for supply tracking. |
| PGOOD1, PGOOD2 | Open-drain power-good status outputs | Assert low if VOUT1 or VFB2 deviates >±10% from regulation point; 25μs fault reporting delay. |
| INTVCC, EXTVCC | Internal 5.1V LDO output / external bias input | INTVCC powers gate drivers and logic; EXTVCC ≥4.7V disables VIN LDO and reduces total IQ. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak EMI by up to 15% across input/output lines - simplifies compliance with CISPR 25 Class 5 automotive EMI limits. |
| OPTI-LOOP Compensation | Enables stable loop response across 10μF–1000μF ceramic/tantalum output capacitors with ESR from 0.5mΩ to 50mΩ. |
| Out-of-Phase Dual Control | 180° interleaving cuts input RMS ripple current by ~70%, allowing smaller input bulk capacitors and lower EMI filter cost. |
| AEC-Q100 Qualified | Qualified per Grade 1 (–40°C to +125°C) - validated for automotive infotainment, ADAS domain controllers, and body electronics. |
| 99% Duty Cycle Capability | Supports near-dropout operation at 350kHz - maintains regulation with VIN as low as 3.33V for 3.3V output. |
Applications
| Automotive Infotainment Power | Industrial Dual-Rail Supply |
|---|---|
Use Scenario: Powering SoC, display interface, and audio codec in head-unit systems with 12V battery input. IC Role / Device Role / Timing Role: Dual-phase buck controller generating tightly regulated 3.3V (Ch1) and 5V (Ch2) rails with synchronized switching. Use Value: Spread spectrum and out-of-phase operation meet stringent CISPR 25 radiated emissions limits without added shielding. |
Use Scenario: Providing isolated 3.3V and 5V rails for PLC I/O modules operating from 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency dual-output controller with independent RUN pin control for rail sequencing and fault isolation. Use Value: 12μA no-load IQ extends uptime in battery-backed systems; AEC-Q100 qualification ensures reliability in harsh environments. |
| Telecom Base Station Bias | Test Equipment Power Management |
Use Scenario: Generating auxiliary 3.3V/5V rails for FPGA configuration, transceiver bias, and monitoring circuitry in 48V-powered base stations. IC Role / Device Role / Timing Role: Wide-input (4.5V–40V) dual-phase controller supporting hot-swap and brownout resilience. Use Value: 99% duty cycle and precise 0.8V reference ensure stable output during input dips; PGOOD flags enable graceful system reset. |
Use Scenario: Programmable dual-output supply in automated test equipment requiring fast transient response and low noise. IC Role / Device Role / Timing Role: Dual-channel controller with OPTI-LOOP and selectable light-load modes for dynamic load profiles. Use Value: Pulse-skipping mode maintains <15mV output ripple at light loads; 3MHz capability enables compact, high-bandwidth design. |
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 |
|---|---|---|---|
| MP2918GQ-Z | Fixed 3.3V/5V dual output; no spread spectrum; 2MHz max freq; 25μA IQ; QFN-24 package | Lacks AEC-Q100 qualification and out-of-phase interleaving; limited EMI mitigation | Lower-cost option for non-automotive industrial use where EMI and efficiency are less critical. |
| ISL78234ARZ-T7A | 3.3V/5V dual output; AEC-Q100 Grade 1; 2.2MHz max; 20μA IQ; no spread spectrum; TQFN-32 | Higher IQ and no EMI dithering; requires external compensation; no OPTI-LOOP | Suitable for automotive applications needing proven qualification but not requiring lowest EMI or widest capacitor compatibility. |
Compared with MP2918GQ-Z and ISL78234ARZ-T7A, the LTC7802EUFDM-3.3 delivers superior EMI performance via spread spectrum, broader capacitor/ESR tolerance via OPTI-LOOP, and lower quiescent current - making it optimal for space-constrained, noise-sensitive automotive and industrial designs where regulatory compliance and battery life are critical.
Availability
LTC7802EUFDM-3.3 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power rails, and telecom base station auxiliary supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant 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 automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC7802EUFDM-3.3 belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, low-EMI, dual-phase synchronous buck conversion in demanding automotive and industrial environments.
FAQ
What is the fixed output voltage of the LTC7802EUFDM-3.3?
The LTC7802EUFDM-3.3 features a factory-trimmed fixed 3.3V output on Channel 1 (VOUT1), with guaranteed accuracy of ±1.5% over temperature and line. Channel 2 (VFB2) is adjustable from 0.8V to 99% of VIN using an external resistor divider - enabling flexible dual-rail configurations without additional components on Ch1.
How does the LTC7802EUFDM-3.3 reduce electromagnetic interference?
The LTC7802EUFDM-3.3 reduces EMI through two integrated mechanisms: (1) 180° out-of-phase dual-channel operation, which cancels input ripple current and lowers required input capacitance, and (2) spread spectrum dithering enabled by tying PLLIN/SPREAD to INTVCC - reducing peak conducted and radiated emissions by up to 15% without affecting regulation stability.
Can the LTC7802EUFDM-3.3 operate with only one channel enabled?
Yes - the LTC7802EUFDM-3.3 supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 low disables Channel 1 while Channel 2 remains active, and vice versa. Both channels can be disabled simultaneously (RUN1/RUN2 < 0.7V) to achieve 1.5μA shutdown current, making the LTC7802EUFDM-3.3 suitable for sequenced or fault-isolated power architectures.
What is the purpose of the EXTVCC pin on the LTC7802EUFDM-3.3?
The EXTVCC pin on the LTC7802EUFDM-3.3 provides an alternative input to the internal 5.1V INTVCC LDO. When EXTVCC ≥4.7V, the device automatically switches from VIN-powered LDO to EXTVCC-powered LDO - reducing total input supply current and enabling efficient self-biasing from a downstream regulated output (e.g., 5V rail), thereby lowering overall system IQ.
Is the LTC7802EUFDM-3.3 qualified for automotive applications?
Yes - the LTC7802EUFDM-3.3 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C), with full characterization and reliability testing per automotive standards. It is explicitly designated for automotive use in the order information table and supported by Automotive Reliability reports available from Analog Devices upon request.
LTC7802EUFDM-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7802EUFDM-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802EUFDM-3.3#PBF 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#PBF reliable?
The price and inventory of LTC7802EUFDM-3.3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC7802EUFDM-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802EUFDM-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802EUFDM-3.3#PBF?
LTC7802EUFDM-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802EUFDM-3.3#PBF 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#PBF?
For technical support, including LTC7802EUFDM-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802EUFDM-3.3#PBF requirements.
6.How does Aetrix verify that LTC7802EUFDM-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7802EUFDM-3.3#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC7802EUFDM-3.3#PBF?
All LTC7802EUFDM-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802EUFDM-3.3#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC7802EUFDM-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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