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Analog Devices Inc. LTC7802EUFDM#PBF
- Part No.:
- LTC7802EUFDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC7802EUFDM#PBF.pdf
- Description:
- 40V, LOW IQ DUAL PHSE SYCH STP-D
- Quantity:
- Payment:
- Shipping:
Inventory:168
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Product details
Overview
LTC7802EUFDM#PBF 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–40V input, delivers 0.8V–99%×VIN output, features 14μA no-load quiescent current, 3MHz max switching frequency, and spread spectrum EMI reduction - used in automotive infotainment power rails and industrial dual-rail supplies.
For engineers reviewing the LTC7802EUFDM#PBF datasheet, LTC7802EUFDM#PBF pinout, LTC7802EUFDM#PBF application, or LTC7802EUFDM#PBF equivalent, key selection criteria include out-of-phase dual-channel operation, RSENSE/DCR current sensing, OPTI-LOOP compensation, programmable 100kHz–3MHz frequency, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC7802EUFDM#PBF implements constant-frequency peak-current-mode control with two independent 180° out-of-phase channels to minimize input ripple and reduce required bulk capacitance. Each channel integrates a transconductance error amplifier (gm = 1.8 mmho), precision 0.8V reference (±12 mV over temp), and dedicated ITH, VFB, TRACK/SS, and PGOOD pins.
Its architecture supports three light-load modes via the MODE pin: Burst Mode® (14μA IQ), pulse-skipping, or forced continuous conduction. Spread spectrum dithering (±12% to ±15% frequency deviation) is enabled by pulling PLLIN/SPREAD to INTVCC, directly reducing conducted and radiated EMI without external filters.
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. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Ch1 on) - enables >1-year battery runtime in always-on vehicle modules. |
| Switching Frequency Range | 100kHz to 3MHz (programmable via FREQ pin resistor) - allows optimization of size (high-f) vs. efficiency (low-f). |
| Feedback Reference Voltage | 0.800V ±12mV (0°C–85°C) - ensures tight output regulation across temperature for 3.3V/5V rails. |
| Current Sense Threshold | 50mV typ (SENSE+ to SENSE−) - enables accurate current limiting with low-value, low-power sense resistors (e.g., 2mΩ). |
| Duty Cycle Capability | 99% at 350kHz - supports ultra-low dropout operation (e.g., 3.3V out from 3.6V input). |
| Package | 28-lead 4mm × 5mm QFN with exposed thermal pad - provides 43°C/W θJA for high-power density layouts. |
Pinout & Package
28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29), rated for –40°C to +125°C junction temperature. Thermal pad must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| 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 SENSE−. |
| SENSE1−, SENSE2− | Differential current sense negative input | Sinks bias current above 3.2V; enables VIN-referred IQ reduction in sleep mode. |
| TG1, TG2 | Top N-MOSFET gate drive output | Floating driver with INTVCC-referenced swing; requires BOOST-SW bootstrap capacitor. |
| BG1, BG2 | Bottom N-MOSFET gate drive output | GND-referenced driver (0V to INTVCC); synchronously commutates with TG for 100% duty cycle support. |
| VFB1, VFB2 | Output voltage feedback input | Compares divider output to 0.8V reference; VFB2 tied to INTVCC configures 2-phase single-output mode. |
| PGOOD1, PGOOD2 | Open-drain power-good indicator | Pulls low if VOUT deviates >±10% from regulation point; enables system sequencing and fault reporting. |
| PLLIN/SPREAD | Sync input / spread spectrum enable | Accepts external clock (0.1–3MHz) for phase-locking; tied to INTVCC enables EMI-reducing dithering. |
| RUN1, RUN2 | Independent channel enable | Logic-level shutdown: <1.1V disables channel; both <0.7V reduces IQ to 1.5μA globally. |
| TRACK/SS1, TRACK/SS2 | Soft-start and tracking input | Internal 12.5μA pull-up ramps voltage; 10nF → 0.65ms ramp time; supports supply tracking during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual-channel operation | Reduces input RMS current by ~30% and cuts required input capacitance by half versus single-phase designs. |
| Spread spectrum modulation | Spreads energy across ±12–15% frequency band, lowering peak EMI by >10dB and easing CISPR 25 Class 5 compliance. |
| OPTI-LOOP™ compensation | Enables stable loop response across wide range of ceramic/POSCAP output capacitors (10μF–1000μF) and ESR (0.5mΩ–50mΩ). |
| Multi-mode light-load control | MODE pin selects Burst Mode® (ultra-low IQ), pulse-skipping (low-noise), or forced CCM (lowest output ripple) - no external components needed. |
| AEC-Q100 Grade E qualification | Validated for automotive applications (-40°C to +125°C), including HTOL, TC, and ESD testing per stress test plan. |
Applications
| Automotive Infotainment Power | Industrial Dual-Rail CPU Core Supply |
|---|---|
Use Scenario: Powering SoC, DSP, and display controllers in head units with strict EMI limits and cold-crank tolerance. IC Role / Device Role / Timing Role: Dual-phase buck controller delivering 3.3V/12A and 5V/10A from 8–16V battery rail with spread spectrum and 99% duty cycle. Use Value: Meets CISPR 25 Class 5 radiated emissions without ferrite beads; sustains operation down to 4.5V during cranking. |
Use Scenario: Generating tightly regulated core and I/O voltages for FPGA or ARM-based PLCs in factory automation. IC Role / Device Role / Timing Role: Independent dual-channel controller enabling staggered startup, independent sequencing, and fault-isolated shutdown. Use Value: Eliminates need for discrete sequencing ICs; PGOOD1/PGOOD2 signals feed into FPGA configuration logic for safe boot. |
| Telecom Base Station Bias Rails | Avionics Sensor Hub Power |
Use Scenario: Providing isolated 5V and 3.3V rails for RF front-end ICs and ADCs in 4G/5G remote radio units. IC Role / Device Role / Timing Role: High-frequency (2.25MHz) dual controller minimizing solution size while maintaining <1% output ripple under dynamic load. Use Value: 3MHz capability shrinks inductors by 70% vs. 500kHz designs; RSENSE sensing enables precise current monitoring for thermal derating. |
Use Scenario: Powering inertial measurement units (IMUs) and pressure sensors in flight control systems requiring high reliability and low noise. IC Role / Device Role / Timing Role: AEC-Q100 qualified controller operating from 28V aircraft bus, delivering clean 3.3V/5V with <10mVpp ripple and fast transient response. Use Value: OPTI-LOOP compensation maintains stability with aging tantalum output caps; shutdown IQ <2μA extends backup battery life. |
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 gate drivers; max 24V input; no spread spectrum. | Targeted at cost-sensitive consumer power supplies; lacks AEC-Q100 rating and automotive temp range. | Select when board space is critical and EMI requirements are moderate; not suitable for automotive or harsh environments. |
| ISL78234ARZ-T7A | Automotive-qualified dual-phase controller with 3.5V–40V input; includes PMBus interface and telemetry; higher IQ (35μA) and no spread spectrum. | Designed for ASIL-B systems requiring digital monitoring; supports real-time current/voltage reporting via I²C. | Select when diagnostics, fault logging, or closed-loop telemetry are required; adds complexity and BOM cost vs. LTC7802EUFDM#PBF. |
Compared with MP2918GL-Z and ISL78234ARZ-T7A, the LTC7802EUFDM#PBF offers superior EMI performance via hardware-enabled spread spectrum, lowest quiescent current in Burst Mode, and flexible RSENSE/DCR sensing - making it optimal for space-constrained, EMI-sensitive automotive and industrial applications where analog control simplicity is preferred.
Availability
LTC7802EUFDM#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, telecom base stations, and avionics sensor hubs requiring stable component supply, long lifecycle support, and AEC-Q100 compliance.
Supply support for LTC7802EUFDM#PBF 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 industrial, automotive, communications, and healthcare markets.
The LTC7802EUFDM#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, multi-phase DC/DC conversion in demanding automotive and industrial environments.
FAQ
What is the maximum supported switching frequency for the LTC7802EUFDM#PBF?
The LTC7802EUFDM#PBF supports up to 3MHz switching frequency when the FREQ pin is configured with a 12.1kΩ resistor to ground. At this frequency, the device maintains stable operation with minimum on-time of 40ns and achieves high power density while preserving efficiency above 90% at medium loads. The LTC7802EUFDM#PBF also supports phase-locking to external clocks from 100kHz to 3MHz via the PLLIN/SPREAD pin.
How does the LTC7802EUFDM#PBF achieve ultra-low quiescent current in battery-powered systems?
The LTC7802EUFDM#PBF achieves 14μA no-load IQ by combining Burst Mode® operation, intelligent bias current routing (via SENSE1− ≥3.2V), and dual-stage LDO power management. In sleep mode, it disconnects the error amplifier and parks ITH at 0.45V, shutting off both MOSFETs. The LTC7802EUFDM#PBF further reduces input-referred current by sourcing bias from SENSE1− or EXTVCC when those nodes exceed 3.2V or 4.8V respectively.
Can the LTC7802EUFDM#PBF be used in a single-output, two-phase configuration?
Yes - the LTC7802EUFDM#PBF supports 2-phase interleaved operation for a single output by connecting VFB2 to INTVCC, tying TRACK/SS2 to TRACK/SS1, and paralleling ITH1 and ITH2. This configuration shares feedback and compensation, forces 180° phase shift, and doubles effective ripple frequency - reducing output capacitor count and improving transient response. The LTC7802EUFDM#PBF datasheet confirms this in the "2-Phase Single Output" application diagram.
What protection features are integrated into the LTC7802EUFDM#PBF?
The LTC7802EUFDM#PBF integrates output overvoltage protection (OVP) triggered at +7% to +13% above the 0.8V reference, power-good monitoring with ±10% window and 25μs fault delay, undervoltage lockout (UVLO) on INTVCC (4.1V rising / 3.75V falling), and automatic dropout recovery with 99% duty cycle enforcement. It also includes internal thermal shutdown and gate-drive shoot-through prevention via fixed dead-time control. These protections operate independently per channel.
Is the LTC7802EUFDM#PBF pin-compatible with other members of the LTC78xx family?
No - the LTC7802EUFDM#PBF has a unique 28-pin UFDM QFN footprint and pinout optimized for dual-channel control with dedicated SENSE, PGOOD, and TRACK/SS pins per channel. It is not pin-compatible with LTC7801 (single-channel), LTC7803 (single-channel with integrated drivers), or LTC7804 (dual-channel with different feature set). Layout reuse requires full schematic and PCB revision; the LTC7802EUFDM#PBF pin mapping must be followed exactly per the datasheet top view.
LTC7802EUFDM#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#PBF FAQ
1.How can I place an order for LTC7802EUFDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7802EUFDM#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#PBF reliable?
The price and inventory of LTC7802EUFDM#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC7802EUFDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7802EUFDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7802EUFDM#PBF?
LTC7802EUFDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7802EUFDM#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#PBF?
For technical support, including LTC7802EUFDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7802EUFDM#PBF requirements.
6.How does Aetrix verify that LTC7802EUFDM#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7802EUFDM#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC7802EUFDM#PBF?
All LTC7802EUFDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7802EUFDM#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#PBF part is unused and in its original packaging.
Return procedure for LTC7802EUFDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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