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Analog Devices Inc. LTC7804IUD#PBF
- Part No.:
- LTC7804IUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7804IUD#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BOOST CONTROL
- Quantity:
- Payment:
- Shipping:
Inventory:243
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Product details
Overview
LTC7804IUD#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, 4.5V–40V input range (down to 1V post-startup), 40V max output, and phase-lockable 100kHz–3MHz switching frequency. It enables high-efficiency battery-powered industrial power supplies and automotive infotainment voltage boosters.
For engineers reviewing the LTC7804IUD#PBF datasheet, LTC7804IUD#PBF pinout, LTC7804IUD#PBF application, or LTC7804IUD#PBF equivalent, key selection criteria include low-IQ operation at light loads, RSENSE/DCR current sensing flexibility, Pass-Thru™ 100% duty cycle capability, OPTI-LOOP compensation for wide output capacitor tolerance, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC7804IUD#PBF implements a constant-frequency peak current-mode control architecture with dual gate drivers (TG/BG) supporting N-channel top/bottom MOSFETs. Its error amplifier (EA) compares VFB against a 1.200V reference and drives ITH to regulate inductor peak current via the current comparator (ICMP).
It integrates an internal 5.15V INTVCC LDO powered either from VBIAS or EXTVCC (≥4.7V), a spread spectrum oscillator/PLL block accepting external clocks on PLLIN/SPREAD, and MODE-selectable light-load operation-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 output - enables single-cell Li-ion to 24V system compatibility. |
| Output Voltage Range | Up to 40V - supports high-voltage LED strings, industrial sensors, and telecom bias rails. |
| No-Load Quiescent Current | 14μA - extends runtime in always-on battery systems such as telematics and remote monitoring. |
| Switching Frequency Range | 100kHz to 3MHz, programmable via FREQ pin resistor or phase-locked to external clock - allows optimization of size vs. efficiency in space-constrained designs. |
| Current Sensing | RSENSE or inductor DCR - provides design flexibility for precision vs. cost-sensitive implementations without additional sense resistors. |
| Spread Spectrum | Enabled by tying PLLIN/SPREAD to INTVCC - reduces peak conducted/radiated EMI by up to 20%, easing CISPR 25 Class 5 compliance. |
| Package | 16-pin 3mm × 3mm QFN with exposed GND pad - delivers θJC = 4.2°C/W thermal resistance for high-power density layouts. |
| AEC-Q100 Grade | Grade I (−40°C to +125°C junction) - qualified for automotive body electronics, ADAS power domains, and infotainment subsystems. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed GND pad (Pin 17), rated for −40°C to +125°C operating junction temperature. Exposed pad must be soldered to PCB for thermal performance (θJA = 68°C/W, θJC = 4.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 16) | Switch node connection | Drives external inductor; voltage swings between VIN and VOUT - requires low-inductance layout and Kelvin sensing for stability. |
| TG (Pin 15) | Top-side N-MOSFET gate driver output | Floating driver with INTVCC-referenced swing - requires BOOST-SW capacitor and Schottky diode for bootstrapping. |
| BG (Pin 13) | Bottom-side N-MOSFET gate driver output | GND-referenced driver - directly controls main switch; low 1.5Ω pull-down resistance minimizes turn-off losses. |
| SENSE+ / SENSE− (Pins 5 / 4) | Differential current sense inputs | Enable accurate peak current limiting using either discrete shunt or DCR sensing - critical for overcurrent protection and loop stability. |
| VFB (Pin 6) | Error amplifier feedback input | Regulates output via external resistor divider; 1.200V ±1.2% reference enables precise 5V–40V output programming. |
| ITH (Pin 7) | Error amplifier output & compensation node | Directly sets current limit threshold and hosts OPTI-LOOP network - allows dynamic response tuning across capacitor ESR/capacitance variations. |
| RUN (Pin 8) | Enable/shutdown control | 1.2V threshold with 100mV hysteresis - supports UVLO implementation or logic-level enable sequencing. |
| MODE (Pin 11) | Light-load operation mode select | GND = Burst Mode, INTVCC = forced CCM, 100k-to-GND = pulse-skipping - selects efficiency vs. output ripple trade-off. |
| FREQ (Pin 9) | Internal VCO frequency set | Resistor-to-GND sets 100kHz–3MHz; INTVCC = 2.25MHz, GND = 375kHz - enables EMI optimization and magnetic component sizing. |
| PLLIN/SPREAD (Pin 10) | External sync input / spread spectrum enable | INTVCC = spread spectrum dithering; external clock = phase-locking - essential for noise-sensitive multi-rail systems. |
| SS (Pin 1) | Soft-start ramp input | 12.5μA internal current charges external capacitor - defines monotonic VOUT ramp time (1ms per 10nF) to prevent inrush stress. |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad - must be solid-soldered to PCB plane for thermal management and low-noise reference integrity. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP compensation | Enables stable transient response across wide ranges of output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ), eliminating iterative loop tuning. |
| Pass-Thru™ 100% duty cycle | Allows seamless transition to direct conduction when VIN ≥ VOUT - eliminates dropout and enables buck-boost-like behavior in wide-input applications. |
| Low shutdown IQ (1.2μA) | Minimizes battery drain during system sleep states - critical for automotive modules requiring ASAM-compliant wake-up readiness. |
| Thermally enhanced QFN | 3mm × 3mm footprint with 4.2°C/W junction-to-case resistance - supports >6A output current in compact 2-layer PCB layouts. |
| AEC-Q100 Grade I qualification | Validated for automotive environments including temperature cycling, HAST, and ESD testing - meets requirements for body control modules and lighting drivers. |
| Programmable light-load modes | Three selectable modes (Burst, pulse-skipping, forced CCM) via MODE pin - lets designers optimize for lowest standby power, lowest ripple, or fastest load transient recovery. |
Applications
| Automotive Infotainment Power | Industrial Sensor Bias Supply |
|---|---|
Use Scenario: Boosting 12V vehicle battery to 24V for LCD backlight and audio amplifiers in head units. IC Role / Device Role / Timing Role: Primary synchronous boost controller managing high-current inductor switching and MOSFET gate drive timing. Use Value: Spread spectrum reduces radiated emissions below CISPR 25 limits; Pass-Thru™ avoids dropout during cold-crank transients. |
Use Scenario: Generating stable 15V bias for 4–20mA loop-powered pressure/temperature transmitters in factory automation. IC Role / Device Role / Timing Role: High-accuracy voltage regulator with tight VFB reference (±1.2%) and low drift over temperature. Use Value: 14μA quiescent current enables long-life operation on 2-wire loop power; AEC-Q100 qualification ensures reliability in harsh plant environments. |
| Portable Medical Instrumentation | Telecom Remote Radio Unit (RRU) |
Use Scenario: Battery-powered ultrasound probe requiring 30V for transducer bias and 5V for analog front-end from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output capable controller (with secondary LDO or post-regulator) delivering regulated high-voltage rail with low noise. Use Value: OPTI-LOOP compensates for aging electrolytic capacitors; low IQ extends field-deployed device runtime between charges. |
Use Scenario: Boosting 24V DC distribution bus to 48V for GaN PA bias in outdoor small-cell base stations. IC Role / Device Role / Timing Role: High-efficiency, high-frequency (2.25MHz) boost stage enabling compact magnetics and reduced board area. Use Value: Phase-lockable frequency synchronizes switching with system clock to suppress beat frequencies; 40V output rating covers full telecom voltage margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5122MTX/NOPB | Higher 2.5μA typical shutdown IQ; fixed 100kHz–2.2MHz frequency; no spread spectrum or Pass-Thru™ mode. | Targeted at industrial power supplies where EMI is less constrained and VIN never approaches VOUT. | Choose LM5122MTX/NOPB for cost-sensitive non-automotive designs needing simpler configuration and TI's long-term supply assurance. |
| MAX17595ATP+T | Supports wider 4.5V–60V input; includes integrated MOSFET drivers but lacks spread spectrum and AEC-Q100 qualification. | Suitable for high-input telecom rectifier stages but not automotive-grade EMI-critical systems. | Select MAX17595ATP+T when input exceeds 40V or when integrated drivers simplify layout - verify thermal derating for 3mm × 3mm QFN replacement. |
Compared with LM5122MTX/NOPB and MAX17595ATP+T, the LTC7804IUD#PBF uniquely combines ultra-low 14μA IQ, AEC-Q100 Grade I qualification, spread spectrum, and Pass-Thru™ capability - making it the only option for automotive-grade, battery-sensitive, EMI-compliant boost applications in compact form factor.
Availability
LTC7804IUD#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor bias supplies, portable medical instrumentation, and telecom remote radio units requiring stable component supply, long-lifecycle support, and AEC-Q100 compliance.
Supply support for LTC7804IUD#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 LTC7804 belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring low EMI, wide input range, and robust thermal performance.
FAQ
What is the minimum input voltage required for LTC7804IUD#PBF to operate after startup?
The LTC7804IUD#PBF can operate with input voltages as low as 1V after startup when biased from the boost converter output (VBIAS tied to VOUT). This capability enables single-cell Li-ion (2.7V–4.2V) or supercapacitor backup systems to sustain regulation during brownout conditions. The 4.5V–40V nominal input range applies when VBIAS is supplied externally.
How does the MODE pin configure light-load operation in LTC7804IUD#PBF?
The MODE pin on the LTC7804IUD#PBF selects among three light-load behaviors: grounding enables Burst Mode (lowest IQ), connecting to INTVCC forces continuous conduction mode (lowest ripple), and pulling to ~2.5V via 100kΩ resistor enables pulse-skipping mode (balanced efficiency/ripple). Internal 100kΩ pull-down ensures default Burst Mode if left floating.
Can LTC7804IUD#PBF drive both high-side and low-side N-channel MOSFETs without external level-shifting components?
Yes, the LTC7804IUD#PBF integrates dedicated gate drivers for both top-side (TG) and bottom-side (BG) N-channel MOSFETs. TG uses an internal charge pump (BOOST pin) to generate floating gate drive above SW, while BG operates referenced to GND. No external level shifters are needed - only a BOOST-SW capacitor and Schottky diode are required for proper bootstrapping.
What is the purpose of the PLLIN/SPREAD pin on LTC7804IUD#PBF, and how is it configured for spread spectrum?
The PLLIN/SPREAD pin on the LTC7804IUD#PBF serves dual functions: applying an external clock enables phase-locking, while tying it to INTVCC activates spread spectrum dithering to reduce EMI peaks. To enable spread spectrum, connect PLLIN/SPREAD directly to INTVCC; tie to GND to disable dithering and run at fixed frequency. This pin must never be left floating.
Is LTC7804IUD#PBF pin-compatible with other variants in the LTC7804 family, such as LTC7804EUD#PBF or LTC7804HUD#PBF?
Yes, all LTC7804 variants - including LTC7804IUD#PBF, LTC7804EUD#PBF, and LTC7804HUD#PBF - share identical 16-pin 3mm × 3mm QFN packaging and pinout. They differ only in temperature grade (E = −40°C to +125°C, I = −40°C to +125°C, H = −40°C to +150°C) and qualification level (I-grade is AEC-Q100 qualified). Layout and schematic are fully interchangeable.
LTC7804IUD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7804IUD#PBF FAQ
1.How can I place an order for LTC7804IUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7804IUD#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 LTC7804IUD#PBF reliable?
The price and inventory of LTC7804IUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7804IUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7804IUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7804IUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7804IUD#PBF?
LTC7804IUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7804IUD#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 LTC7804IUD#PBF?
For technical support, including LTC7804IUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7804IUD#PBF requirements.
6.How does Aetrix verify that LTC7804IUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7804IUD#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 LTC7804IUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7804IUD#PBF?
All LTC7804IUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7804IUD#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 LTC7804IUD#PBF part is unused and in its original packaging.
Return procedure for LTC7804IUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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