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Analog Devices Inc. LTC7802EUFDM#TRPBF
- Part No.:
- LTC7802EUFDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802EUFDM#TRPBF.pdf
- Description:
- 40V, LOW IQ DUAL PHSE SYCH STP-D
- Quantity:
- Payment:
- Shipping:
Inventory:2,670
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Product details
Overview
LTC7802EUFDM#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 up to 99% duty cycle, supports 100kHz–3MHz programmable switching frequency, and achieves 14μA no-load quiescent current-enabling high-efficiency power conversion in automotive infotainment and industrial 24V rail systems.
For engineers reviewing the LTC7802EUFDM#TRPBF datasheet, LTC7802EUFDM#TRPBF pinout, LTC7802EUFDM#TRPBF application, or LTC7802EUFDM#TRPBF equivalent, key selection criteria include out-of-phase dual-channel operation for reduced input ripple, spread spectrum EMI reduction, OPTI-LOOP compensation for wide output capacitor/ESR tolerance, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC7802EUFDM#TRPBF implements constant-frequency peak current-mode control with two independent 180° out-of-phase channels, minimizing input capacitance requirements and supply-induced noise. Each channel features independent feedback (VFB1/VFB2), error amplifier outputs (ITH1/ITH2), and soft-start/tracking inputs (TRACK/SS1/SS2).
Its architecture integrates dual gate drivers (TG1/BG1/TG2/BG2) with 2Ω pull-up/pull-down on-resistance, internal 5.1V INTVCC LDO powered from VIN or EXTVCC (switchover at 4.7V), and precision 0.8V reference with ±12mV total feedback voltage error over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide industrial and automotive battery rails without pre-regulation. |
| Quiescent Current (No Load) | 14μA - extends runtime in always-on battery-powered systems such as telematics modules. |
| Switching Frequency | 100kHz to 3MHz (programmable via FREQ pin resistor) - enables compact magnetics and noise-sensitive RF co-location. |
| Feedback Reference Voltage | 0.8V ±12mV - ensures accurate output regulation across temperature and load for 3.3V/5V/12V rails. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 24V input → 23.5V output). |
| Spread Spectrum | ±12% frequency dither - reduces peak conducted/radiated EMI to simplify CISPR 25 Class 5 compliance. |
| Operating Temp Range | −40°C to +125°C (E-grade) - qualified for under-hood automotive and industrial edge computing environments. |
Pinout & Package
Package: 28-lead 4mm × 5mm QFN with exposed thermal pad (Pin 29 = GND). Requires soldering of exposed pad for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense positive inputs | Interface directly to RSENSE or DCR networks; enable accurate current limiting and cycle-by-cycle protection. |
| SENSE1–, SENSE2– | Differential current sense negative inputs | Supply bias current above 3.2V to reduce VIN-referred IQ in sleep mode - critical for ultra-low-power wake-up circuits. |
| TG1, TG2 / BG1, BG2 | Top/bottom N-MOSFET gate drivers | 2Ω on-resistance drivers support fast switching with minimal gate charge loss; floating BOOST pins enable high-side drive. |
| VFB1, VFB2 | Output voltage feedback inputs | Each regulates independent output; tie VFB2 to INTVCC for 2-phase single-output configuration. |
| PLLIN/SPREAD | Sync input / spread spectrum enable | Accepts external clock (0.1–3MHz) for system-level synchronization or connects to INTVCC for EMI reduction. |
| RUN1, RUN2 | Independent channel enable inputs | 1.15V threshold with 100mV hysteresis - supports precise UVLO sequencing and independent power rail control. |
| MODE | Light-load operation mode select | GND = Burst Mode (lowest IQ), INTVCC = forced continuous, resistor-to-INTVCC = pulse-skipping - selectable per system noise/efficiency trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces RMS input ripple by ~70% vs. in-phase, cutting required bulk capacitance and PCB area. |
| OPTI-LOOP compensation | Allows stable loop response across 10μF–1000μF output capacitors and 0.5mΩ–50mΩ ESR - eliminates re-tuning for different capacitor vendors. |
| Programmable light-load modes | Burst Mode (14μA IQ), pulse-skipping, or forced continuous - preserves efficiency across 1mA–20A load range without external circuitry. |
| Internal 5.1V INTVCC LDO | Powered from VIN or higher-efficiency EXTVCC (≥4.7V); reduces self-heating and improves overall converter efficiency. |
| Power good indicators | Open-drain PGOOD1/PGOOD2 monitor ±10% VOUT regulation with 25μs fault reporting - enables safe system power sequencing. |
Applications
| Automotive Infotainment Power | Industrial 24V Distributed Power |
|---|---|
Use Scenario: Dual-rail power supply for head unit SoC (1.1V core, 3.3V I/O) and display backlight (5V, 12V) in vehicles with 9–16V battery input. IC Role / Device Role / Timing Role: Dual-phase buck controller managing independent 3.3V/5V outputs with synchronized soft-start and tracking to prevent supply sequencing faults. Use Value: AEC-Q100 qualification, 125°C operation, and spread spectrum ensure robust EMC performance in noisy automotive environments. | Use Scenario: Primary 24V-to-5V/12V conversion for PLC I/O modules operating in factory-floor cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-input-voltage controller delivering regulated outputs with 99% duty cycle capability to sustain operation during brownouts. Use Value: 40V max input rating and −40°C to +125°C range eliminate need for upstream pre-regulators or derating in harsh industrial settings. |
| Telecom Remote Radio Unit (RRU) | Avionics Power Management |
Use Scenario: Compact, low-noise 48V-to-3.3V/5V supply for FPGA and ADC/DAC in outdoor wireless base station radios. IC Role / Device Role / Timing Role: Dual-channel controller operating at 2.25MHz with spread spectrum to meet stringent FCC Part 15 radiated emissions limits. Use Value: 3MHz max frequency enables <10mm² inductor footprint; phase interleaving suppresses 100kHz–1GHz EMI peaks. | Use Scenario: Redundant 28V aircraft bus-to-5V/15V conversion for flight control sensors requiring fail-safe power monitoring. IC Role / Device Role / Timing Role: Dual-output controller with independent PGOOD1/PGOOD2 signals feeding watchdog logic and fault isolation circuitry. Use Value: Independent RUN1/RUN2 shutdown and ±10% PGOOD accuracy support DO-160D lightning-induced transient resilience and redundancy validation. |
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 MOSFETs (30V max input, 40A total); no spread spectrum; 500kHz–1.2MHz fixed freq. | Suitable for space-constrained, lower-power (<20W) applications where integration outweighs EMI flexibility. | Select MP2918GL-Z when board area is critical and external MOSFETs are undesirable; avoid if >40V input or CISPR 25 compliance is required. |
| ISL78234ARZ-T7A | AEC-Q100 automotive dual-phase controller (4.5V–40V); includes PMBus interface and telemetry; 150°C junction rating; no spread spectrum. | Preferred for systems requiring real-time telemetry (VIN/VOUT/IOUT/temp) and functional safety diagnostics (ASIL-B capable). | Select ISL78234ARZ-T7A when digital monitoring, fault logging, or ASIL-B compliance is mandatory; LTC7802EUFDM#TRPBF remains optimal for analog simplicity and EMI control. |
Compared with MP2918GL-Z and ISL78234ARZ-T7A, the LTC7802EUFDM#TRPBF uniquely balances ultra-low IQ (14μA), spread spectrum EMI suppression, and full analog configurability - making it ideal for cost-sensitive, high-reliability analog power designs where digital overhead is unnecessary.
Availability
LTC7802EUFDM#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V distributed power, and avionics power management requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LTC7802EUFDM#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 industrial, automotive, communications, and healthcare markets.
The LTC7802 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-noise, and thermally robust DC/DC conversion in demanding automotive and industrial applications.
FAQ
What is the maximum input voltage rating for the LTC7802EUFDM#TRPBF?
The LTC7802EUFDM#TRPBF has an absolute maximum input voltage rating of 40V on the VIN pin. Its operational input range is specified from 4.5V to 40V, enabling direct connection to 24V and 36V industrial or automotive battery rails without external protection circuitry. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
How does the MODE pin affect light-load efficiency in the LTC7802EUFDM#TRPBF?
The MODE pin configures light-load behavior: grounding selects Burst Mode (14μA IQ), tying to INTVCC forces continuous conduction, and using a 100kΩ resistor to INTVCC enables pulse-skipping. Each mode trades off output ripple, EMI, and efficiency - Burst Mode maximizes battery life in standby, while continuous mode minimizes noise in sensitive analog circuits.
Can the LTC7802EUFDM#TRPBF operate with only one channel enabled?
Yes. The LTC7802EUFDM#TRPBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN2 below 1.1V disables Channel 2 while Channel 1 remains fully operational with full current-mode control, soft-start, and PGOOD monitoring - useful for asymmetric power rail requirements or phased system bring-up.
What is the purpose of the PLLIN/SPREAD pin on the LTC7802EUFDM#TRPBF?
The PLLIN/SPREAD pin serves dual functions: when driven by an external clock (0.1–3MHz), it synchronizes LTC7802EUFDM#TRPBF's switching edges to reduce system-level beat frequencies; when tied to INTVCC, it activates spread spectrum dithering (±12% frequency modulation) to lower peak EMI emissions - both critical for passing CISPR 25 or FCC Part 15 testing.
Does the LTC7802EUFDM#TRPBF require external MOSFETs?
Yes. The LTC7802EUFDM#TRPBF is a controller-only IC and requires external N-channel MOSFETs for both high-side (driven by TG1/TG2) and low-side (driven by BG1/BG2) switches. This architecture enables optimization for voltage, current, and thermal requirements - unlike integrated power stages - and supports discrete solutions up to 40V input and multi-ampere loads.
LTC7802EUFDM#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#TRPBF FAQ
1.How can I place an order for LTC7802EUFDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802EUFDM#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#TRPBF reliable?
The price and inventory of LTC7802EUFDM#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7802EUFDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802EUFDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802EUFDM#TRPBF?
LTC7802EUFDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802EUFDM#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#TRPBF?
For technical support, including LTC7802EUFDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802EUFDM#TRPBF requirements.
6.How does Aetrix verify that LTC7802EUFDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7802EUFDM#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7802EUFDM#TRPBF?
All LTC7802EUFDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802EUFDM#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC7802EUFDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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