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Analog Devices Inc. LTC7804EUD#PBF
- Part No.:
- LTC7804EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7804EUD#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BOOST CONTROL
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
LTC7804EUD#PBF from Analog Devices is a high-performance synchronous boost DC/DC controller driving all-N-channel MOSFET stages, featuring 14 μA no-load quiescent current, spread spectrum EMI reduction, and programmable 100 kHz–3 MHz switching frequency. It operates from 4.5 V to 40 V input (down to 1 V post-startup), delivers up to 40 V output, and supports Pass-Thru™ 100% duty cycle - ideal for automotive infotainment power rails and industrial 24 V bus boost converters.
For engineers reviewing the LTC7804EUD#PBF datasheet, LTC7804EUD#PBF pinout, LTC7804EUD#PBF application, or LTC7804EUD#PBF equivalent, key selection criteria include light-load mode flexibility (Burst/Pulse-Skipping/Continuous), RSENSE/DCR current sensing compatibility, OPTI-LOOP compensation tuning, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7804EUD#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 precise 1.200 V reference and drives ITH to regulate inductor peak current, enabling stable loop response across wide output capacitance and ESR ranges via OPTI-LOOP compensation.
Spread spectrum dithering is enabled by pulling PLLIN/SPREAD to INTVCC, reducing conducted/EMI peaks without altering average frequency; phase-locking is achieved when an external clock is applied to PLLIN/SPREAD. The MODE pin selects among Burst Mode (low IQ), pulse-skipping (low ripple), or forced continuous conduction - each with distinct transient response and efficiency trade-offs at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 40 V; supports operation down to 1 V after startup when biased from VOUT - enables cold-crank automotive use cases. |
| Output Voltage Range | Up to 40 V; regulated via external resistor divider on VFB - suitable for 24 V/36 V industrial bus boosting. |
| No-Load Quiescent Current | 14 μA typical; extends battery runtime in always-on systems like telematics or ADAS sensors. |
| Switching Frequency Range | 100 kHz to 3 MHz; programmable via FREQ pin resistor or phase-locked to external clock - allows EMI-sensitive layout optimization. |
| Current Sense Threshold | 50 mV typical; supports low-loss RSENSE or DCR sensing - reduces power loss and thermal stress in high-current designs. |
| Shutdown Current | 1.2 μA max; enables ultra-low-power system-level sleep modes without auxiliary regulators. |
| Feedback Reference Voltage | 1.200 V ±1.0% over temperature; ensures accurate output regulation across –40°C to 125°C junction range. |
| Package | 16-pin 3 mm × 3 mm QFN (UD); thermally enhanced exposed pad - delivers θJA = 68°C/W for compact high-power density layouts. |
Pinout & Package
Package: 16-lead (3 mm × 3 mm) plastic QFN with exposed GND pad (Pin 17), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top-side N-MOSFET gate driver output | Floating driver with INTVCC-referenced swing; requires BOOST capacitor for high-side drive - enables efficient synchronous rectification. |
| SW (Pin 2) | Switch node connection | Connects to inductor and source of bottom MOSFET; critical for layout low-inductance routing to minimize EMI and ringing. |
| SENSE– (Pin 4) | Negative current sense input | Differential input to current comparator; used with SENSE+ to set precise current limit - supports Kelvin sensing for accuracy. |
| SENSE+ (Pin 5) | Positive current sense input | Accepts common-mode voltage up to 40 V; supplies current to comparator when > INTVCC - enables direct DCR sensing without bias network. |
| VFB (Pin 6) | Error amplifier feedback input | Compares output voltage (via resistor divider) to 1.200 V reference - determines final regulated output voltage with <±1% tolerance. |
| ITH (Pin 7) | Error amplifier output & compensation node | Controls peak inductor current; connects to OPTI-LOOP compensation network - allows dynamic response tuning for varied output caps. |
| RUN (Pin 8) | Enable/shutdown control | 1.2 V threshold; <0.7 V forces shutdown (1.2 μA IQ); ties directly to VIN for always-on operation - simplifies power sequencing. |
| FREQ (Pin 9) | Internal VCO frequency programming | Resistor-to-GND sets 100 kHz–3 MHz; tie to INTVCC for 2.25 MHz fixed - enables EMI spread or noise-sensitive frequency selection. |
| PLLIN/SPREAD (Pin 10) | External sync input / spread spectrum enable | Tie to INTVCC for spread spectrum; apply external clock for phase-lock - reduces peak EMI without changing average fSW. |
| MODE (Pin 11) | Light-load operating mode select | GND = Burst Mode; INTVCC = Continuous; 100 kΩ to INTVCC = Pulse-Skipping - balances efficiency vs. output ripple at light loads. |
| INTVCC (Pin 12) | Internal 5.15 V LDO output | Powers gate drivers and analog circuits; requires ≥4.7 μF ceramic decoupling - ensures stable core supply under load transients. |
| EXTVCC (Pin 13) | External bias input for INTVCC LDO | Enables bypass of VBIAS LDO when >4.7 V; improves efficiency using downstream regulator output - reduces heat in multi-rail systems. |
| VBIAS (Pin 14) | Main bias supply input | Accepts 4.5–40 V; powers internal LDO and logic; typically tied to VIN or VOUT - provides flexible biasing for wide-input applications. |
| BG (Pin 15) | Bottom N-MOSFET gate driver output | GND-referenced driver with 1.5 Ω pull-down; complements TG for synchronous boost - eliminates body-diode conduction losses. |
| BOOST (Pin 16) | Bootstrap supply for TG driver | Requires capacitor to SW; Schottky diode to INTVCC - sustains high-side drive during 100% duty cycle Pass-Thru operation. |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad; connects to CIN/COUT negatives and small-signal grounds - mandatory for thermal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak radiated/conducted EMI by dithering oscillator frequency up to ±10% - eases compliance with CISPR 25 Class 5 automotive EMI limits. |
| OPTI-LOOP Compensation | Allows single-pole compensation network to optimize transient response across wide output capacitance (10 μF–1000 μF) and ESR ranges - eliminates iterative loop tuning. |
| Pass-Thru™ Capability | Supports 100% duty cycle when VIN ≥ VOUT - maintains regulated output during input brownouts or battery sag without dropout. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E, –40°C to +125°C) with full reliability testing - meets requirements for infotainment, ADAS, and body electronics. |
| RSENSE or Inductor DCR Sensing | Configurable current sensing eliminates need for dedicated sense resistors - reduces BOM cost and board space while maintaining ±5% current limit accuracy. |
| Low Shutdown IQ | 1.2 μA maximum shutdown current - enables system-level deep sleep without auxiliary power management ICs. |
Applications
| Automotive Infotainment Power | Industrial 24V Bus Boost |
|---|---|
Use Scenario: Powering LCD displays, audio amplifiers, and USB-C PD controllers from a 12 V vehicle battery with cold-crank capability (down to 1 V). IC Role / Device Role / Timing Role: Synchronous boost controller regulating 24 V output with spread spectrum to meet CISPR 25 EMI limits. Use Value: 14 μA quiescent current extends battery life in parked mode; Pass-Thru™ maintains display operation during engine cranking. | Use Scenario: Stepping up 24 V industrial bus to 36 V for PLC I/O modules requiring higher isolation margins. IC Role / Device Role / Timing Role: High-efficiency boost controller with RSENSE current sensing and OPTI-LOOP for stable regulation under variable load. Use Value: 95% peak efficiency at 6 A reduces thermal design burden; AEC-Q100 qualification ensures long-term reliability in harsh environments. |
| Telecom Remote Radio Unit | Military Avionics Power |
Use Scenario: Generating 28 V bias for RF power amplifiers in 5G remote radio heads powered from 48 V backplane. IC Role / Device Role / Timing Role: Phase-lockable boost controller synchronized to system clock to avoid beat frequencies in sensitive RF bands. Use Value: PLLIN/SPREAD pin enables deterministic EMI placement; 3 MHz max frequency allows compact magnetics for space-constrained enclosures. | Use Scenario: Providing 28 V/36 V outputs for mission-critical avionics sensors and data acquisition units in aircraft with wide input transients. IC Role / Device Role / Timing Role: Robust boost controller with UVLO hysteresis (300 mV), overtemperature protection, and 125°C junction rating. Use Value: Guaranteed operation from –40°C to +125°C; 40 V absolute max input withstands MIL-STD-704A transients up to ±100 V. |
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 | Fixed 100 kHz–2 MHz frequency; no spread spectrum; 25 μA IQ; non-AEC-Q100 | Lower EMI mitigation capability; wider input range (3 V–75 V); less suited for automotive EMI-critical designs | Select when spread spectrum is unnecessary and input voltage may dip below 4.5 V. |
| MAX20096ATPA/VY+ | AEC-Q100 Grade 0 (–40°C to +150°C); integrated MOSFETs; 2.2 MHz fixed fSW; 28 μA IQ | Higher integration reduces external component count but limits output voltage to 36 V and max current to 5 A | Select for space-constrained automotive applications where 5 A output suffices and discrete MOSFETs are undesirable. |
Compared with LM5122MTX/NOPB and MAX20096ATPA/VY+, the LTC7804EUD#PBF uniquely combines ultra-low 14 μA quiescent current, spread spectrum EMI reduction, Pass-Thru™ operation, and AEC-Q100 qualification - making it optimal for automotive and industrial boost converters demanding efficiency, reliability, and regulatory compliance.
Availability
LTC7804EUD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V bus boost, and telecom remote radio unit applications requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7804EUD#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™ high-efficiency DC/DC controller product line, designed specifically for demanding automotive and industrial applications requiring low IQ, EMI robustness, and wide input/output voltage flexibility.
FAQ
What is the minimum input voltage required for LTC7804EUD#PBF startup?
The LTC7804EUD#PBF requires a minimum 4.5 V on VBIAS to initiate startup. However, once running and biased from the output rail (VBIAS tied to VOUT), it can sustain operation down to 1 V input - enabling functionality during automotive cold-crank events where battery voltage dips below 6 V. This behavior is confirmed in the Electrical Characteristics table and Applications Information section of the datasheet.
Does LTC7804EUD#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC7804EUD#PBF supports both methods. SENSE+ and SENSE− form a differential input that accepts either a shunt resistor (RSENSE) or the voltage drop across an inductor's DCR. When SENSE+ exceeds INTVCC, it actively sources current into the comparator - a feature enabling accurate DCR sensing without external bias networks. This dual-sensing capability is explicitly detailed in the Pin Functions and Applications Information sections.
How does the MODE pin configure light-load operation in LTC7804EUD#PBF?
The MODE pin of the LTC7804EUD#PBF selects among three light-load strategies: grounding enables Burst Mode (lowest IQ, ~14 μA); tying to INTVCC forces continuous conduction (best transient response); and connecting via a 100 kΩ resistor to INTVCC selects pulse-skipping (low ripple, moderate IQ). These configurations are defined in the Pin Functions section and validated in Typical Performance Characteristics Figures G04–G07.
Is LTC7804EUD#PBF pin-compatible with other variants in the LTC7804 family?
Yes, the LTC7804EUD#PBF shares identical pinout and footprint with all other LTC7804 UD-package variants (e.g., LTC7804IUD#PBF, LTC7804HUD#PBF) and MSOP-package versions (e.g., LTC7804EMSE#PBF). The QFN (UD) and MSOP (MSE) packages have different land patterns, but all 16-pin variants - regardless of temperature grade (E/I/H) or automotive suffix (#WPBF) - maintain consistent pin assignment and electrical behavior per the Pin Configuration diagram and Order Information table.
What thermal performance can be expected from the LTC7804EUD#PBF QFN package?
The LTC7804EUD#PBF in its 3 mm × 3 mm QFN package has θJA = 68°C/W and θJC = 4.2°C/W when the exposed GND pad (Pin 17) is properly soldered to a 1-in² copper area. This enables reliable operation at full load (e.g., 6 A output) up to +125°C junction temperature. Thermal data is specified in the Package Description section and validated in the Absolute Maximum Ratings table.
LTC7804EUD#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)
LTC7804EUD#PBF FAQ
1.How can I place an order for LTC7804EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7804EUD#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 LTC7804EUD#PBF reliable?
The price and inventory of LTC7804EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7804EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7804EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7804EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7804EUD#PBF?
LTC7804EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7804EUD#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 LTC7804EUD#PBF?
For technical support, including LTC7804EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7804EUD#PBF requirements.
6.How does Aetrix verify that LTC7804EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7804EUD#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 LTC7804EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7804EUD#PBF?
All LTC7804EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7804EUD#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 LTC7804EUD#PBF part is unused and in its original packaging.
Return procedure for LTC7804EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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