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Analog Devices Inc. LTC7804EMSE#PBF
- Part No.:
- LTC7804EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7804EMSE#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BOOST CONTROL
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
LTC7804EMSE#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, 4.5V–40V input range (down to 1V post-startup), 3MHz phase-lockable switching frequency, spread spectrum EMI reduction, and Pass-Thru™ 100% duty cycle capability - deployed in automotive infotainment power supplies requiring high efficiency and low EMI.
For engineers reviewing the LTC7804EMSE#PBF datasheet, LTC7804EMSE#PBF pinout, LTC7804EMSE#PBF application, or LTC7804EMSE#PBF equivalent, key selection criteria include light-load mode configurability (Burst/Pulse-Skipping/Continuous), RSENSE or DCR current sensing flexibility, OPTI-LOOP compensation for wide output capacitor/ESR tolerance, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7804EMSE#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 modulates ITH to regulate output voltage via inductor current control.
It integrates a spread spectrum oscillator and phase-locked loop (PLL) on the PLLIN/SPREAD pin, enabling external clock synchronization (0.1–3MHz) or internal dithering when tied to INTVCC. The MODE pin selects among Burst Mode (ground), pulse-skipping (100kΩ to INTVCC), or forced continuous conduction (INTVCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V; supports operation down to 1V after startup when biased from VOUT - enables cold-crank automotive use cases. |
| Quiescent Current (IQ) | 14μA typical at no load - extends battery runtime in always-on vehicle subsystems. |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable up to 3MHz - allows EMI-sensitive designs to shift noise away from critical bands. |
| Feedback Reference Voltage | 1.200V ±12mV over temperature - ensures precise output regulation across automotive thermal ranges. |
| Current Sense Threshold | 50mV typical max; supports both RSENSE shunt and inductor DCR sensing - reduces BOM cost and board space vs. dedicated sense resistors. |
| Shutdown IQ | 1.2μA - meets ultra-low-power system sleep requirements. |
| Package | 16-pin MSOP with exposed GND pad - provides 40°C/W θJA for thermally constrained automotive PCB layouts. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE), 3mm × 4.9mm, exposed pad (Pin 17) connected to GND. Requires soldering of exposed pad for rated thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS (Pin 1) | Soft-Start Input | Internal 12.5μA pull-up charges external capacitor to ramp VFB reference linearly - prevents inrush current during power-up. |
| SENSE− (Pin 2) | Negative Current Sense Input | Differential input to current comparator; referenced to SENSE+ - enables accurate peak current limiting with minimal offset drift. |
| SENSE+ (Pin 3) | Positive Current Sense Input | Accepts common-mode voltage up to 40V; sources current when > INTVCC - supports high-side RSENSE or DCR sensing topologies. |
| VFB (Pin 4) | Error Amplifier Feedback Input | Compares divided output voltage against 1.200V reference - sets regulated VOUT via external resistor divider (e.g., 24V = 1.2V × (R1/R2 + 1)). |
| ITH (Pin 5) | Error Amplifier Output / Compensation Node | Controls current comparator trip point; connects to RC/CC network for loop stability - enables OPTI-LOOP tuning across diverse output capacitors. |
| RUN (Pin 6) | Enable/Shutdown Control | 1.2V threshold; <0.7V disables IC and drops IQ to 1.2μA - provides clean system-level power sequencing. |
| FREQ (Pin 7) | Frequency Programming Input | Resistor-to-GND sets 100kHz–3MHz; tie to INTVCC for 2.25MHz fixed - eliminates external clock source for most applications. |
| PLLIN/SPREAD (Pin 8) | Synchronization & Spread Spectrum Select | Tie to INTVCC for EMI-reducing dither; apply external clock (0.1–3MHz) for deterministic timing alignment - satisfies CISPR 25 Class 5 radiated emissions. |
| MODE (Pin 9) | Light-Load Operation Mode Select | GND = Burst Mode (highest light-load efficiency); INTVCC = Continuous; 100kΩ to INTVCC = Pulse-Skipping - balances efficiency vs. output ripple per load profile. |
| INTVCC (Pin 10) | Internal 5.15V LDO Output | Powers gate drivers and analog circuitry; requires ≥4.7μF ceramic decoupling - stable local supply avoids noise coupling into control loop. |
| EXTVCC (Pin 11) | External Bias Input for INTVCC LDO | Enables bypass of VBIAS LDO when >4.7V applied - improves efficiency by using downstream converter output as bias rail. |
| VBIAS (Pin 12) | Main Bias Supply | Accepts 4.5V–40V; powers internal LDO when EXTVCC unused - supports wide-input industrial and transportation systems. |
| BG (Pin 13) | Bottom Gate Driver Output | Drives N-MOSFET source to GND; 1.5Ω pull-down resistance - ensures fast turn-off and minimizes shoot-through risk. |
| BOOST (Pin 14) | Bootstrap Supply for Top Driver | Connects to SW via capacitor; Schottky diode to INTVCC - sustains floating gate drive for high-side N-MOSFET without charge pump limitations. |
| TG (Pin 15) | Top Gate Driver Output | Swings INTVCC above SW node; drives N-MOSFET gate - enables efficient synchronous rectification with zero-body-diode conduction loss. |
| SW (Pin 16) | Switch Node Connection | Connects to inductor and MOSFET drains; handles full switching current - requires tight layout to minimize EMI and ringing. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to PCB plane - essential for thermal dissipation and low-noise small-signal referencing. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Modulation | Reduces peak conducted/radiated EMI by spreading fundamental and harmonic energy across 0–20% bandwidth - simplifies compliance with automotive EMC standards. |
| Pass-Thru™ 100% Duty Cycle | Allows VOUT to track VIN when VIN > VOUT - eliminates dropout loss in battery backup or input-following applications. |
| OPTI-LOOP Compensation | Enables stable loop response across 10μF–1000μF output capacitance and 1mΩ–100mΩ ESR - accommodates polymer, ceramic, or hybrid capacitor selections. |
| AEC-Q100 Qualified | Rated for −40°C to +125°C junction temperature (Grade E) - validated for automotive powertrain, ADAS, and infotainment systems. |
| Low-Voltage Startup Capability | Operates from 1V input after initial start-up when biased from VOUT - supports cold-crank scenarios where battery dips below 6V. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Rail Booster |
|---|---|
Use Scenario: Powers LCD displays, audio amplifiers, and USB-C PD ports in vehicles where battery voltage varies from 6V (cold crank) to 16V (load dump). IC Role / Device Role / Timing Role: Synchronous boost controller regulating 12V input to stable 24V/6A output with spread spectrum to meet CISPR 25 Class 5 limits. Use Value: 14μA IQ extends always-on functionality; Pass-Thru™ maintains output during low-VIN transients without dropout. |
Use Scenario: Generates 36V from 24V factory automation bus to drive solenoids, PLC I/O modules, and sensors requiring higher voltage rails. IC Role / Device Role / Timing Role: High-efficiency boost controller operating at 375kHz with RSENSE current sensing for precise overcurrent protection. Use Value: 4.5V–40V input range accommodates brownout conditions; AEC-Q100 qualification ensures long-term reliability in harsh environments. |
| Telecom Remote Radio Unit (RRU) | Military Avionics Power Sequencing |
Use Scenario: Supplies 48V intermediate bus from 28V aircraft or telecom battery in remote radio heads with strict EMI constraints. IC Role / Device Role / Timing Role: Phase-lockable boost controller synchronized to system clock to avoid beat frequencies with baseband signals. Use Value: PLLIN/SPREAD pin enables deterministic noise placement; 3MHz max frequency allows compact magnetics for size-constrained enclosures. |
Use Scenario: Provides controlled 28V→40V conversion for radar front-end modules requiring soft-start, fault reporting, and thermal derating. IC Role / Device Role / Timing Role: Precision current-mode controller with programmable soft-start (SS pin) and overtemperature protection. Use Value: RUN pin enables system-level shutdown coordination; exposed GND pad ensures thermal margin at 125°C ambient. |
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; 4.5V–38V input; 100μA IQ | Lacks EMI mitigation features; lower light-load efficiency; not AEC-Q100 qualified | Select when spread spectrum and ultra-low IQ are non-critical and cost is prioritized. |
| TPS40210DGQ | Current-mode controller with 500kHz–1MHz range; 2.97V–15V input; 1.5mA IQ; no PLL or spread spectrum | Lower input voltage ceiling; higher IQ limits battery life; no automotive qualification | Choose for low-voltage industrial DC-DC where thermal headroom exceeds 125°C. |
Compared with LTC3780EFE#PBF and TPS40210DGQ, the LTC7804EMSE#PBF delivers superior EMI performance via spread spectrum, 14× lower no-load IQ than TPS40210DGQ, and AEC-Q100 qualification - making it the only option suitable for automotive infotainment and safety-critical 24V boost applications requiring regulatory compliance and extended runtime.
Availability
LTC7804EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 24V-to-36V boost converters, and telecom remote radio units requiring stable component supply, AEC-Q100 qualification, and low EMI design support.
Supply support for LTC7804EMSE#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 ultra-low IQ, wide input range, and robust EMI performance.
FAQ
What is the minimum input voltage required for startup of the LTC7804EMSE#PBF?
The LTC7804EMSE#PBF requires a minimum 4.5V on the VBIAS pin to initiate startup. Once running and biased from the output (VBIAS tied to VOUT), it sustains operation down to 1V input - enabling reliable cold-crank performance in automotive systems where battery voltage may dip below 6V during engine cranking. This behavior is confirmed in the Electrical Characteristics table and Applications Information section of the datasheet.
Does the LTC7804EMSE#PBF support both RSENSE and inductor DCR current sensing?
Yes, the LTC7804EMSE#PBF supports both sensing methods via its differential SENSE+ and SENSE− pins. It accepts common-mode voltages up to 40V and includes internal offsets optimized for low-value shunts or DCR-based detection. The datasheet specifies 50mV typical maximum sense threshold and provides design guidelines for both configurations in the Applications Information section.
How does the spread spectrum feature of the LTC7804EMSE#PBF reduce EMI?
The LTC7804EMSE#PBF's spread spectrum dithers the switching frequency by up to ±10% around the nominal value when the PLLIN/SPREAD pin is tied to INTVCC. This spreads energy across a wider bandwidth, reducing peak radiated and conducted emissions - directly addressing CISPR 25 Class 5 requirements for automotive electronics without requiring additional filtering components.
What package type and thermal characteristics apply to the LTC7804EMSE#PBF?
The LTC7804EMSE#PBF uses a 16-lead MSOP (MSE) package with an exposed GND pad (Pin 17). Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated performance - critical for automotive applications operating at 125°C junction temperature.
Can the LTC7804EMSE#PBF operate in 100% duty cycle mode, and how is it enabled?
Yes, the LTC7804EMSE#PBF supports Pass-Thru™ 100% duty cycle operation when VIN exceeds VOUT. This mode is automatic and requires no configuration - the controller seamlessly transitions to direct conduction, eliminating dropout loss and maintaining regulation during input voltage surges or transient conditions.
LTC7804EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC7804EMSE#PBF FAQ
1.How can I place an order for LTC7804EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7804EMSE#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 LTC7804EMSE#PBF reliable?
The price and inventory of LTC7804EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7804EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7804EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7804EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7804EMSE#PBF?
LTC7804EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7804EMSE#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 LTC7804EMSE#PBF?
For technical support, including LTC7804EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7804EMSE#PBF requirements.
6.How does Aetrix verify that LTC7804EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7804EMSE#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 LTC7804EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7804EMSE#PBF?
All LTC7804EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7804EMSE#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 LTC7804EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7804EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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