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Analog Devices Inc. LTC7804HUD#PBF
- Part No.:
- LTC7804HUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7804HUD#PBF.pdf
- Description:
- LOW IQ SYNCH BOOST CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LTC7804HUD#PBF from Analog Devices is a high-performance synchronous boost DC/DC controller driving all-N-channel MOSFET stages, featuring 14μA no-load quiescent current, spread spectrum EMI reduction, and programmable 100kHz–3MHz switching frequency. It operates from 4.5V–40V input (down to 1V post-startup), delivers up to 40V output, and supports Pass-Thru™ 100% duty cycle - ideal for automotive infotainment power rails requiring low EMI and wide VIN range.
For engineers reviewing the LTC7804HUD#PBF datasheet, LTC7804HUD#PBF pinout, LTC7804HUD#PBF application, or LTC7804HUD#PBF equivalent, key selection criteria include its AEC-Q100 qualification, thermally enhanced 3mm × 3mm QFN package with exposed GND pad, RSENSE/DCR current sensing flexibility, and OPTI-LOOP compensation for stable transient response across diverse output capacitors.
Technical Context
The LTC7804HUD#PBF implements a constant-frequency peak current-mode control architecture with dual gate drivers (TG/BG) supporting N-channel top/bottom MOSFETs. Its internal 5.15V INTVCC LDO powers logic and drivers, while EXTVCC input enables efficient external biasing above 4.7V.
Spread spectrum dithering is enabled via PLLIN/SPREAD = INTVCC, reducing peak conducted/radiated noise; phase-locking is supported over 0.1–3MHz when driven externally. Light-load behavior is configurable via MODE pin: Burst Mode (1.2μA shutdown IQ), pulse-skipping, or forced continuous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V; operates down to 1V after startup when biased from VOUT - enables cold-crank automotive operation. |
| Output Voltage Range | Up to 40V; regulated feedback voltage fixed at 1.200V ±1.2% - sets output via external resistor divider. |
| Quiescent Current | 14μA typical in sleep mode; 1.2μA in shutdown - extends battery runtime in always-on systems. |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable 0.1–3MHz - allows EMI band avoidance and multi-phase synchronization. |
| Current Sensing | RSENSE or inductor DCR sensing; max sense threshold 50mV - supports low-loss, high-accuracy current limiting. |
| Package | 16-pin 3mm × 3mm QFN with exposed thermal pad (Pin 17 = GND) - θJC = 4.2°C/W enables high-power density designs. |
| AEC-Q100 Grade | H-grade: –40°C to +150°C junction temperature - qualified for under-hood automotive applications. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed GND pad (Pin 17). Thermal performance requires soldering exposed pad to PCB ground plane per manufacturer guidelines (θJA = 68°C/W, θJC = 4.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 16) | Switch node connection | Connects to inductor and MOSFET source-drain path; carries high di/dt - requires tight layout and Kelvin sensing for stability. |
| TG (Pin 15) | Top N-MOSFET gate driver output | Floating driver with INTVCC-referenced swing; drives gate of high-side MOSFET - requires BOOST capacitor and Schottky diode. |
| BG (Pin 13) | Bottom N-MOSFET gate driver output | Ground-referenced driver; turns on main switch - low 1.5Ω pull-down resistance minimizes turn-off losses. |
| BOOST (Pin 14) | Bootstrap supply for TG | Capacitor between BOOST and SW provides floating bias for TG - must use low-leakage ceramic or Schottky-clamped design. |
| SENSE+ / SENSE− (Pins 5 / 4) | Differential current sense inputs | Measure voltage across RSENSE or DCR; 50mV full-scale threshold enables precise overcurrent protection without shunt loss. |
| VFB (Pin 6) | Feedback input to error amplifier | Compares output voltage (via resistor divider) to 1.200V reference - determines regulation accuracy and loop stability. |
| ITH (Pin 7) | Error amplifier output & compensation node | Controls peak inductor current; connects to OPTI-LOOP compensation network - enables wide ESR/capacitance tolerance. |
| RUN (Pin 8) | Enable/shutdown control | 1.2V threshold; <0.7V forces 1.2μA shutdown - supports UVLO implementation or microcontroller-controlled sequencing. |
| MODE (Pin 11) | Light-load operating mode select | GND = Burst Mode; INTVCC = forced continuous; 100k-to-GND = pulse-skipping - optimizes efficiency vs. ripple tradeoff. |
| PLLIN/SPREAD (Pin 10) | Sync input / spread spectrum enable | INTVCC = spread spectrum; external clock = phase-lock - reduces EMI peaks without altering average frequency. |
| FREQ (Pin 9) | Internal oscillator programming | GND = 375kHz; INTVCC = 2.25MHz; resistor-to-GND sets 100kHz–3MHz - enables frequency tuning for layout or noise constraints. |
| INTVCC (Pin 12) | Internal 5.15V LDO output | Powers gate drivers and analog circuitry; requires ≥4.7μF ceramic decoupling - critical for driver strength and noise immunity. |
| VBIAS (Pin 14) | Main bias supply input | Accepts 4.5V–40V; powers internal LDO when EXTVCC <4.7V - allows flexible bias sourcing from VIN or VOUT. |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad; connects to source of bottom MOSFET and CIN/COUT negatives - mandatory for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Spread spectrum modulation | Reduces peak radiated/conducted EMI by spreading oscillator energy across ±20% bandwidth - simplifies compliance with CISPR 25 Class 5. |
| Pass-Thru™ 100% duty cycle | Enables VOUT ≈ VIN operation when input exceeds target - eliminates dropout during transients and supports seamless buck-boost transitions. |
| OPTI-LOOP compensation | Allows stable loop response with wide range of output capacitor types (ceramic, polymer, electrolytic) and ESR values - reduces design iteration. |
| Low IQ sleep mode | 14μA operating current enables >1-year battery life in always-on telematics modules with 100mAh coin cell. |
| AEC-Q100 H-grade qualification | Validated for –40°C to +150°C operation with HTOL, TC, and UHAST - meets automotive under-hood reliability requirements. |
| RSENSE or DCR current sensing | Supports either discrete shunt or lossless inductor-based sensing - lowers BOM cost and improves thermal efficiency in high-current designs. |
Applications
| Automotive Infotainment Power | Industrial 24V Boost Rails |
|---|---|
Use Scenario: Powering LCD displays, audio amplifiers, and USB-C PD controllers from 9–16V vehicle battery with cold-crank support. IC Role / Device Role / Timing Role: Synchronous boost controller regulating 24V/3A output with spread spectrum EMI suppression. Use Value: AEC-Q100 H-grade rating ensures operation at 150°C junction; 1V startup enables functionality during engine cranking. |
Use Scenario: Generating stable 36V bias for industrial PLC I/O modules from 24V DC bus with high ripple rejection. IC Role / Device Role / Timing Role: High-efficiency boost controller with OPTI-LOOP compensation maintaining regulation under variable load steps. Use Value: 14μA quiescent current minimizes standby loss; 40V output capability supports legacy 36V sensor interfaces. |
| Avionics Display Backlight | Telecom Remote Radio Unit |
Use Scenario: Driving CCFL or LED backlights in cockpit displays requiring low-noise, high-reliability DC/DC conversion. IC Role / Device Role / Timing Role: Spread spectrum boost controller delivering 30V/500mA with <10mVpp output ripple. Use Value: Phase-lockable frequency synchronizes with system clock to avoid beat frequencies; 100% duty cycle prevents dropout during input dips. |
Use Scenario: Providing 28V auxiliary rail for remote radio unit FEMs in 5G base stations powered from -48V telecom supply. IC Role / Device Role / Timing Role: Wide-input boost controller operating from 36–72V input range with burst-mode efficiency at light loads. Use Value: RSENSE/DCR flexibility allows optimal tradeoff between sensing accuracy and conduction loss; EXTVCC input enables efficient bias from local 5V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Fixed 300kHz/600kHz frequency; no spread spectrum; 55V max VIN; 100μA IQ | Higher IQ limits battery use; lacks EMI reduction features; wider VIN suits industrial 48V systems | Select when fixed frequency and higher input voltage tolerance outweigh EMI and ultra-low IQ needs. |
| MP9486AGN-Z | 4.5–60V input; 500kHz fixed freq; 30μA IQ; no spread spectrum or phase-lock; QFN-16 | Lower cost; no AEC-Q100 qualification; limited light-load mode options | Choose for cost-sensitive non-automotive applications where EMI and automotive qualification are not required. |
Compared with LTC3780EFE#PBF and MP9486AGN-Z, the LTC7804HUD#PBF uniquely combines AEC-Q100 H-grade reliability, spread spectrum EMI reduction, and 14μA sleep current - making it the only option qualified for thermally demanding, low-EMI automotive boost applications.
Availability
LTC7804HUD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V boost rails, and avionics display backlighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7804HUD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC7804HUD#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI DC/DC conversion in automotive, industrial, and aerospace applications requiring robust thermal performance and stringent reliability.
FAQ
What is the maximum output voltage supported by the LTC7804HUD#PBF?
The LTC7804HUD#PBF supports an output voltage up to 40V, set by an external resistor divider connected to the VFB pin and referenced to its precise 1.200V internal feedback voltage. This allows flexible configuration for 12V, 24V, 36V, or 40V rails without requiring additional regulation stages.
Does the LTC7804HUD#PBF require external bootstrap components?
Yes, the LTC7804HUD#PBF requires an external bootstrap capacitor between BOOST and SW pins, plus a low-leakage Schottky diode from BOOST to INTVCC. These components provide the floating gate drive voltage for the top N-channel MOSFET (TG), enabling high-side switching without external level-shifting circuitry.
How does spread spectrum operation reduce EMI in the LTC7804HUD#PBF?
The LTC7804HUD#PBF reduces peak conducted and radiated EMI by modulating its switching frequency ±20% around the nominal value when PLLIN/SPREAD is tied to INTVCC. This spreads energy across a wider bandwidth, lowering amplitude at any single frequency - easing compliance with CISPR 25 and FCC Part 15 limits.
Can the LTC7804HUD#PBF operate with input voltage below 4.5V?
Yes - once started, the LTC7804HUD#PBF can sustain operation with input voltage as low as 1V when biased from its own output (VBIAS = VOUT). However, initial startup requires ≥4.5V on VBIAS unless using external biasing; this enables functionality during automotive cold-crank events where battery drops to ~6V but downstream rails remain active.
What thermal considerations apply to the LTC7804HUD#PBF's QFN package?
The LTC7804HUD#PBF uses a 3mm × 3mm QFN with exposed GND pad (Pin 17), requiring soldering to a PCB thermal pad for rated performance (θJC = 4.2°C/W). Failure to connect the exposed pad degrades thermal resistance significantly - leading to premature thermal shutdown or reduced lifetime in high-power applications.
LTC7804HUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7804HUD#PBF FAQ
1.How can I place an order for LTC7804HUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7804HUD#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 LTC7804HUD#PBF reliable?
The price and inventory of LTC7804HUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7804HUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7804HUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7804HUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7804HUD#PBF?
LTC7804HUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7804HUD#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 LTC7804HUD#PBF?
For technical support, including LTC7804HUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7804HUD#PBF requirements.
6.How does Aetrix verify that LTC7804HUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7804HUD#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 LTC7804HUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7804HUD#PBF?
All LTC7804HUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7804HUD#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 LTC7804HUD#PBF part is unused and in its original packaging.
Return procedure for LTC7804HUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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