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Analog Devices Inc. LTC7802JUFDM#WPBF
- Part No.:
- LTC7802JUFDM#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802JUFDM#WPBF.pdf
- Description:
- 40V, LOW IQ DUAL PHSE SYCH STP-D
- Quantity:
- Payment:
- Shipping:
Inventory:155
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Product details
Overview
LTC7802JUFDM#WPBF 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 0.8V–99%×VIN outputs, supports up to 3MHz switching with spread spectrum EMI reduction, and achieves 14μA no-load quiescent current-ideal for automotive infotainment power rails requiring low-noise, wide-input battery-supplied operation.
For engineers reviewing the LTC7802JUFDM#WPBF datasheet, LTC7802JUFDM#WPBF pinout, LTC7802JUFDM#WPBF application, or LTC7802JUFDM#WPBF equivalent, key selection criteria include its AEC-Q100 qualification, out-of-phase dual-channel architecture reducing input capacitance, OPTI-LOOP compensation for broad output capacitor compatibility, and selectable light-load modes (Burst/Pulse-Skipping/Continuous) with precise 0.8V reference and PGOOD monitoring.
Technical Context
The LTC7802JUFDM#WPBF implements constant-frequency peak-current-mode control with two independent 180° out-of-phase channels, enabling reduced input ripple and lower RMS input capacitor stress. Its phase-lockable oscillator (100kHz–3MHz) supports external synchronization via PLLIN/SPREAD and programmable frequency setting through the FREQ pin using resistor dividers.
It integrates dual 5.1V INTVCC LDOs powered from VIN or EXTVCC (switchover at 4.7V), precision 0.8V feedback reference with ±12mV tolerance over temperature, and robust protection including output overvoltage detection (±10% trip), dropout detection enabling 99% duty cycle, and thermal shutdown. The J-grade variant is rated for −40°C to +150°C junction operation.
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. |
| Quiescent Current (No Load) | 14μA - extends runtime in always-on vehicle modules like telematics or ADAS sensors. |
| Switching Frequency | Programmable 100kHz–3MHz - enables compact magnetics and noise shaping via spread spectrum dithering. |
| Feedback Reference Voltage | 0.8V ±12mV - ensures tight output regulation across temperature and load for stable MCU/SOC core supplies. |
| Operating Junction Temp | −40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and powertrain applications. |
| Output Voltage Range | 0.8V to 99% × VIN - supports wide-range outputs including 3.3V, 5V, and 12V rails from single input source. |
| Shutdown Current | 1.5μA - enables ultra-low-power system sleep states with full controller disable. |
Pinout & Package
Package: 28-lead 4mm × 5mm side-wettable QFN (UFDM) with exposed GND pad (Pin 29), optimized for thermal dissipation and automated optical inspection in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1+, SENSE2+ | Differential current sense positive inputs | Interface with RSENSE or DCR networks to set accurate current limit thresholds (50mV typ) per channel. |
| SENSE1–, SENSE2– | Differential current sense negative inputs | Supply bias current above 3.2V to reduce VIN-referred IQ; enable sleep mode current sourcing from output rail. |
| TG1, TG2 / BG1, BG2 | Top/bottom N-MOS gate drivers | Deliver 2Ω pull-up/pull-down drive strength with <25ns transition times for efficient 3MHz switching. |
| VFB1, VFB2 | Output voltage feedback inputs | Accept resistor divider signals; VFB2 tied to INTVCC configures 2-phase single-output operation. |
| MODE | Light-load operation mode select | Ground = Burst Mode; INTVCC = Continuous; 100k-to-INTVCC = Pulse-Skipping - directly controls efficiency vs. noise trade-off. |
| PLLIN/SPREAD | Sync input / spread spectrum enable | External clock input for phase-locking; tie to INTVCC for EMI-reducing frequency dithering; ground to disable. |
| RUN1, RUN2 | Independent channel enable | Below 1.1V disables respective channel; both below 0.7V enters 1.5μA shutdown - supports dynamic rail sequencing. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low when VOUT deviates >±10% from regulation point - enables safe system boot and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak conducted/EMI by spreading oscillator frequency ±12% to ±15%, easing CISPR 25 Class 5 compliance without added filtering. |
| Out-of-Phase Dual Channels | 180° phase shift halves input ripple current amplitude, allowing 50% smaller bulk input capacitors and lower supply-induced noise coupling. |
| OPTI-LOOP Compensation | Enables stable loop response across wide range of output capacitor ESR (0.5mΩ–100mΩ) and capacitance (10μF–1000μF), simplifying design reuse. |
| AEC-Q100 Qualified (Grade 1) | Validated for automotive use with guaranteed operation from −40°C to +150°C junction, including HTOL, TC, and ESD testing per standard. |
| 99% Duty Cycle Capability | Dropout detector forces periodic top-FET off-time to recharge bootstrap caps, enabling near-100% conduction during low-VIN conditions (e.g., cold-crank). |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
|
Use Scenario: Dual-rail power for SoC (3.3V) and display interface (5V) in head-unit systems operating from 9V–16V battery with cold-crank down to 4.5V. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent output regulation, sequencing, and EMI-constrained switching. Use Value: 14μA IQ preserves battery life during vehicle sleep; spread spectrum meets stringent automotive EMC limits; AEC-Q100 ensures reliability. |
Use Scenario: High-efficiency 24V-to-5V/3.3V conversion for isolated digital I/O power in factory automation controllers exposed to 40V transients. IC Role / Device Role / Timing Role: Wide-input dual-controller providing regulated auxiliary rails with input overvoltage tolerance and robust start-up under varying line conditions. Use Value: 40V absolute max input rating withstands load-dump events; out-of-phase operation minimizes input capacitor stress; PGOOD enables safe I/O initialization. |
| Avionics Sensor Hub Supply | Medical Imaging Front-End Power |
|
Use Scenario: Low-noise, high-reliability 28V-to-12V/5V conversion for inertial measurement units (IMUs) and GPS receivers in UAVs and aircraft subsystems. IC Role / Device Role / Timing Role: Dual-channel controller delivering tightly regulated, low-ripple supplies with deterministic timing for time-critical sensor data acquisition. Use Value: 0.8V reference accuracy ±12mV ensures stable ADC reference; 150°C junction rating supports conduction-cooled enclosures; shutdown IQ <2μA aids power budgeting. |
Use Scenario: Precision dual-rail supply (1.8V/3.3V) for FPGA-based image processing in portable ultrasound devices powered from 12V Li-ion packs. IC Role / Device Role / Timing Role: Synchronous buck controller enabling fast transient response and soft-start ramp control to prevent inrush into sensitive analog front-end circuitry. Use Value: TRACK/SS pins allow coordinated voltage ramping; OPTI-LOOP supports ceramic capacitor stability; Burst Mode extends battery runtime between scans. |
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; lacks spread spectrum, fixed 600kHz–2.2MHz range, no EXTVCC switchover. | Lower BOM count but higher thermal density; unsuitable for CISPR 25 Class 5 EMI targets without external filters. | Select MP2918GL-Z only when board space is critical and EMI requirements are less stringent than automotive Grade 5. |
| ISL78234ARZ-T7A | AEC-Q100 Grade 0 (−40°C to +150°C), 40V input, but fixed 2.1MHz frequency, no programmable light-load modes, and no spread spectrum. | Designed specifically for ADAS camera modules; lacks flexible frequency tuning and multi-mode light-load optimization. | Choose ISL78234ARZ-T7A when targeting camera power with strict ASIL-B compliance and fixed high-frequency operation is acceptable. |
Compared with MP2918GL-Z and ISL78234ARZ-T7A, the LTC7802JUFDM#WPBF uniquely combines AEC-Q100 Grade 1 qualification, programmable 100kHz–3MHz operation, spread spectrum EMI reduction, and three selectable light-load modes-making it the only option supporting both ultra-low IQ and stringent automotive EMC requirements in a single package.
Availability
LTC7802JUFDM#WPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, and avionics sensor hub designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC7802JUFDM#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, Inc. 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, sensing, and signal chain solutions.
The LTC7802JUFDM#WPBF belongs to Analog Devices' Power by Linear™ controller family, engineered for high-efficiency, low-EMI, wide-input DC/DC conversion in safety-critical and thermally constrained environments.
FAQ
What is the maximum junction temperature rating for the LTC7802JUFDM#WPBF?
The LTC7802JUFDM#WPBF is specified for operation from −40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This rating is validated through HTOL, temperature cycling, and thermal characterization per JEDEC standards. The device incorporates thermal shutdown protection that activates above TJMAX to prevent permanent damage. Always verify PCB thermal design using θJA = 43°C/W and derate lifetime above 125°C per Analog Devices' reliability guidelines.
How does the LTC7802JUFDM#WPBF achieve ultra-low quiescent current in battery-powered systems?
The LTC7802JUFDM#WPBF achieves 14μA no-load IQ through multiple design features: selective internal circuit disabling in light-load modes, SENSE1– bias current sourcing from output rails (reducing VIN-referred current), and dual LDO architecture that shuts off the VIN-powered regulator when EXTVCC ≥ 4.7V. In shutdown (both RUN pins < 0.7V), IQ drops to 1.5μA. These mechanisms are confirmed in the Electrical Characteristics table (Rev. A, Page 3) and validated across the full −40°C to +150°C range for the J-grade part.
Can the LTC7802JUFDM#WPBF be configured for single-output, two-phase operation?
Yes, the LTC7802JUFDM#WPBF supports single-output, two-phase operation by connecting VFB2 to INTVCC (5.1V), which forces both channels to regulate to the same feedback node (VFB1). TRACK/SS1 and ITH1 serve both channels, while TRACK/SS2 and ITH2 are unused. This configuration reduces output ripple by √2 and improves transient response, as documented in the Pin Functions section (Page 10) and Applications Information (Page 12). External component values must be matched for balanced current sharing.
What is the purpose of the PLLIN/SPREAD pin on the LTC7802JUFDM#WPBF?
The PLLIN/SPREAD pin on the LTC7802JUFDM#WPBF serves dual functions: when driven by an external clock, it synchronizes the rising edge of TG1 to that clock (phase-locking); when tied to INTVCC, it enables spread spectrum frequency dithering (±12% to ±15%) to reduce EMI peaks. Grounding the pin disables both features. This behavior is explicitly defined in the Pin Functions section (Page 9) and verified in Typical Performance Characteristics (Figure G17). No external components are required for basic operation.
Does the LTC7802JUFDM#WPBF support RSENSE and DCR current sensing simultaneously across both channels?
Yes, the LTC7802JUFDM#WPBF supports independent current sensing methods per channel: SENSE1+/- and SENSE2+/- accept either discrete RSENSE resistors or DCR-based sensing networks (using RC filter networks per channel). The datasheet confirms "RSENSE or DCR Current Sensing" as a key feature and specifies matching error (±3.5mV) and maximum threshold (50mV typ) separately for each channel. Both configurations are validated in the Electrical Characteristics table (Page 3) and supported in all operating modes including Burst and Pulse-Skipping.
LTC7802JUFDM#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-QFN (4x5)
LTC7802JUFDM#WPBF FAQ
1.How can I place an order for LTC7802JUFDM#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802JUFDM#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 LTC7802JUFDM#WPBF reliable?
The price and inventory of LTC7802JUFDM#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7802JUFDM#WPBF is usually 5 days.
3.What payment methods are accepted for LTC7802JUFDM#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802JUFDM#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802JUFDM#WPBF?
LTC7802JUFDM#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802JUFDM#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 LTC7802JUFDM#WPBF?
For technical support, including LTC7802JUFDM#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802JUFDM#WPBF requirements.
6.How does Aetrix verify that LTC7802JUFDM#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC7802JUFDM#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 LTC7802JUFDM#WPBF meets industry standards.
7.What is the process for return or replacement of LTC7802JUFDM#WPBF?
All LTC7802JUFDM#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802JUFDM#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 LTC7802JUFDM#WPBF part is unused and in its original packaging.
Return procedure for LTC7802JUFDM#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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