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Analog Devices Inc. LTC7802IUFDM#WPBF
- Part No.:
- LTC7802IUFDM#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802IUFDM#WPBF.pdf
- Description:
- 40V, LOW IQ DUAL PHSE SYCH STP-D
- Quantity:
- Payment:
- Shipping:
Inventory:279
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Product details
Overview
LTC7802IUFDM#WPBF from Analog Devices is a dual-phase, synchronous step-down DC/DC controller driving all-N-channel MOSFETs for high-efficiency 3.3V/12A and 5V/10A outputs. It operates from 4.5V to 40V input, delivers 0.8V–99%×VIN output range, features 14μA no-load quiescent current, 3MHz max switching frequency, and spread spectrum EMI reduction - deployed in automotive infotainment power rails and industrial dual-rail supplies.
For engineers reviewing the LTC7802IUFDM#WPBF datasheet, LTC7802IUFDM#WPBF pinout, LTC7802IUFDM#WPBF application, or LTC7802IUFDM#WPBF equivalent, key selection criteria 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-grade reliability.
Technical Context
The LTC7802IUFDM#WPBF 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 dual-loop architecture integrates separate ITH error amplifier outputs, VFB feedback inputs, and TRACK/SS soft-start pins per channel - supporting both independent dual-output and 2-phase single-output configurations.
It embeds a programmable oscillator (100kHz–3MHz) with phase-lock capability via PLLIN/SPREAD pin, spread spectrum dithering (±12% to ±15%), and precision 0.8V reference with ±12mV total error over temperature. Power management includes VIN/EXTVCC dual-LDO biasing, sleep mode with 1.5μA shutdown IQ, and dropout detection enabling 99% duty cycle at 350kHz.
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 | Programmable 100kHz–3MHz - enables compact magnetics; 3MHz operation allows <1μH inductors. |
| Feedback Reference Voltage | 0.8V ±12mV - sets precise output regulation; supports 0.8V–39.6V output range via resistor divider. |
| Current Sense Threshold | 50mV typ (±5mV matching) - enables accurate RSENSE-based or DCR-based current sensing with low loss. |
| Output Overvoltage Protection | ±10% trip threshold at VFB - provides fast fault response to prevent downstream damage. |
| Operating Junction Temp | –40°C to +125°C - qualified per AEC-Q100 Grade I for under-hood automotive use. |
Pinout & Package
28-lead 4mm × 5mm QFN package with exposed thermal pad (Pin 29 = GND), side-wettable leads for automated optical inspection. Package meets IPC/JEDEC J-STD-020 moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense positive input | Connects to high-side of RSENSE or DCR network; sets current limit threshold with ITH voltage. |
| SENSE1–, SENSE2– | Differential current sense negative input | Supplies bias current above 3.2V; enables VIN-current reduction 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; sinks/source up to 2A peak; complements TG for synchronous rectification. |
| VFB1, VFB2 | Output voltage feedback input | Compares divided output to 0.8V reference; tie VFB2 to INTVCC for 2-phase single-output configuration. |
| TRACK/SS1, TRACK/SS2 | Soft-start and tracking input | Internal 12.5μA pull-up charges external capacitor; ramps VOUT linearly; supports supply tracking. |
| PLLIN/SPREAD | External sync clock input / spread spectrum enable | Accepts 0.1–3MHz external clock; tie to INTVCC for spread spectrum; tie to GND to disable. |
| MODE | Light-load operation mode select | Ground = Burst Mode; INTVCC = Continuous; INTVCC via 100kΩ = Pulse-Skipping. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces input RMS current by ~30% and cuts required input capacitance nearly in half vs. single-phase. |
| Spread spectrum modulation | Reduces peak conducted/EMI emissions by >10dB across 100kHz–10MHz band - simplifies EMC compliance. |
| OPTI-LOOP compensation | Allows stable loop response across 10μF–1000μF output capacitors and 0.5mΩ–50mΩ ESR - eliminates re-tuning for BOM changes. |
| VIN/EXTVCC dual-LDO biasing | Enables INTVCC sourcing from high-efficiency output rail (e.g., 5V output), reducing total system IQ by up to 70%. |
| 99% maximum duty cycle | Supports ultra-low dropout operation down to VOUT = 0.99 × VIN - critical for cold-crank 6V automotive scenarios. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with HTOL, TC, UHAST, and ESD testing - suitable for front-end ADAS power supplies. |
Applications
| Automotive Infotainment Power | Industrial Dual-Rail CPU Core Supply |
|---|---|
Use Scenario: Powering SoC, display, and audio subsystems in head units with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Dual-channel buck controller generating isolated 3.3V (SoC I/O) and 5V (USB/audio) rails with interleaved switching. Use Value: Spread spectrum and out-of-phase operation reduce 12V bus noise below CISPR 25 Class 5 limits without added ferrites. |
Use Scenario: Providing tightly regulated 1.2V core and 1.8V I/O rails for FPGA or ARM-based PLC controllers from 24V industrial bus. IC Role / Device Role / Timing Role: Configured as 2-phase single-output for 1.2V/20A core rail, with second channel supplying 1.8V/10A I/O rail. Use Value: OPTI-LOOP compensates for wide ESR variation across industrial-grade bulk capacitors, ensuring stability across temperature and lifetime. |
| Avionics Display Backlight Driver | Telecom Base Station Bias Supply |
Use Scenario: Generating 24V/2A backlight supply from 28V aircraft bus with high reliability and low EMI in confined avionics bays. IC Role / Device Role / Timing Role: Single-channel configured for 24V output using 99% duty cycle during low-VIN brownout conditions. Use Value: AEC-Q100 qualification and 125°C junction rating meet DO-160 Section 20 environmental stress requirements. |
Use Scenario: Delivering 3.3V/15A and 5V/12A bias rails for RF transceiver modules in 48V-powered macro base stations. IC Role / Device Role / Timing Role: Dual independent channels with separate RUN pins enable staggered startup and fault isolation between RF and digital sections. Use Value: 14μA no-load IQ minimizes standby power draw across thousands of deployed units, reducing OPEX. |
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 MOSFET support; max 24V input. | Targeted at space-constrained consumer SSDs, not high-voltage automotive/industrial systems. | Select LTC7802IUFDM#WPBF for 40V input, discrete MOSFET flexibility, and AEC-Q100 compliance. |
| ISL78234ARZ-T7A | Automotive-qualified dual-phase controller with 3.1V–40V input; lacks spread spectrum; fixed 2.2MHz frequency only. | Used in ADAS camera modules where EMI is managed via shielding rather than spectral shaping. | Choose LTC7802IUFDM#WPBF when spread spectrum, programmable frequency, and lower IQ are required. |
Compared with MP2918GL-Z and ISL78234ARZ-T7A, the LTC7802IUFDM#WPBF offers broader input range (4.5–40V), lower quiescent current (14μA vs. >30μA), and integrated spread spectrum - making it optimal for EMI-sensitive, high-reliability automotive and industrial dual-rail designs.
Availability
LTC7802IUFDM#WPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, avionics displays, and telecom base station bias rails requiring stable component supply, long-term lifecycle support, and AEC-Q100 traceability.
Supply support for LTC7802IUFDM#WPBF 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, industrial automation, and automotive safety markets since 1965.
The LTC7802IUFDM#WPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, low-EMI, multi-phase DC/DC conversion in demanding automotive and industrial environments.
FAQ
What is the maximum input voltage rating for the LTC7802IUFDM#WPBF?
The LTC7802IUFDM#WPBF has an absolute maximum input supply voltage (VIN) rating of 40V. Its operational input range is specified from 4.5V to 40V, making it suitable for 12V, 24V, and 36V automotive and industrial bus systems. Exceeding 40V on VIN may cause permanent damage per Absolute Maximum Ratings.
Does the LTC7802IUFDM#WPBF support synchronization to an external clock source?
Yes, the LTC7802IUFDM#WPBF supports external clock synchronization via the PLLIN/SPREAD pin. When an external clock (0.1–3MHz) is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge. This enables deterministic timing across multiple converters in noise-sensitive systems.
How does the MODE pin configure light-load behavior in the LTC7802IUFDM#WPBF?
The MODE pin of the LTC7802IUFDM#WPBF selects among three light-load operating modes: grounding enables Burst Mode® for lowest IQ; connecting to INTVCC forces continuous conduction; and applying a DC voltage between 1.2V and (INTVCC – 1.3V) selects pulse-skipping. An internal 100kΩ pull-down ensures Burst Mode if left floating.
Can the LTC7802IUFDM#WPBF be used in a 2-phase single-output configuration?
Yes, the LTC7802IUFDM#WPBF supports 2-phase single-output operation. Tie VFB2 to INTVCC to share feedback and compensation between channels, while using VFB1 and ITH1 as the master control loop. This configuration delivers higher current capability and lower output ripple compared to dual independent outputs.
What thermal management requirements apply to the LTC7802IUFDM#WPBF package?
The LTC7802IUFDM#WPBF uses a 28-lead 4mm × 5mm QFN with exposed thermal pad (Pin 29). For rated electrical and thermal performance, this pad must be soldered to a minimum 100mm² PCB copper area with ≥4 thermal vias to inner ground planes. θJA is 43°C/W with proper layout; junction temperature must remain ≤125°C for AEC-Q100 Grade I operation.
LTC7802IUFDM#WPBF 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)
LTC7802IUFDM#WPBF FAQ
1.How can I place an order for LTC7802IUFDM#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802IUFDM#WPBF 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#WPBF reliable?
The price and inventory of LTC7802IUFDM#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7802IUFDM#WPBF is usually 5 days.
3.What payment methods are accepted for LTC7802IUFDM#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802IUFDM#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802IUFDM#WPBF?
LTC7802IUFDM#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802IUFDM#WPBF 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#WPBF?
For technical support, including LTC7802IUFDM#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802IUFDM#WPBF requirements.
6.How does Aetrix verify that LTC7802IUFDM#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC7802IUFDM#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LTC7802IUFDM#WPBF?
All LTC7802IUFDM#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802IUFDM#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LTC7802IUFDM#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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