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Analog Devices Inc. LTC7804IMSE#PBF
- Part No.:
- LTC7804IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7804IMSE#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BOOST CONTROL
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
LTC7804IMSE#PBF from Analog Devices is a high-performance synchronous boost DC/DC controller driving all-N-channel MOSFET stages, supporting 4.5V–40V input and up to 40V output, with 14μA no-load quiescent current, spread spectrum EMI reduction, and 100kHz–3MHz programmable switching frequency - deployed in automotive infotainment power supplies requiring low-noise 12V-to-24V conversion.
For engineers reviewing the LTC7804IMSE#PBF datasheet, LTC7804IMSE#PBF pinout, LTC7804IMSE#PBF application, or LTC7804IMSE#PBF equivalent, key selection criteria include light-load efficiency mode selection (Burst/Pulse-Skipping/Continuous), RSENSE/DCR current sensing flexibility, Pass-Thru™ 100% duty cycle capability, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7804IMSE#PBF implements a constant-frequency peak-current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and OPTI-LOOP compensation, enabling stable regulation across wide output capacitance and ESR ranges. Its dual-mode gate drivers support synchronized top/bottom N-MOSFET switching with 15ns dead-time control and <80ns minimum on-time.
It features dual power rails: INTVCC (5.15V ±2%) supplied either from VBIAS via internal LDO or from EXTVCC ≥4.7V, plus a dedicated BOOST charge pump delivering up to 65µA to sustain high-side driver operation. Spread spectrum dithering (0–20% frequency deviation) and phase-lockable PLL (0.1–3MHz) are implemented via the PLLIN/SPREAD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V continuous; operates down to 1V after startup when biased from output - enables cold-crank automotive operation and wide industrial input tolerance. |
| Output Voltage Range | Up to 40V regulated - supports high-voltage LED drivers, industrial sensors, and telecom bias rails. |
| No-Load Quiescent Current | 14μA typical - extends battery runtime in always-on telematics modules and remote monitoring nodes. |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable 0.1–3MHz - allows EMI-sensitive designs to shift noise away from critical bands or synchronize with system clocks. |
| Current Sense Threshold | 50mV typical (45–55mV) - enables precise overcurrent protection with low-loss RSENSE or DCR sensing, minimizing conduction loss. |
| Feedback Reference Voltage | 1.200V ±1.2% (1.188–1.212V) - ensures tight output voltage regulation across temperature and load, critical for ADC reference supplies. |
| Shutdown Current | 1.2μA maximum - meets ultra-low-power system sleep requirements without external disconnect circuitry. |
| Operating Temperature | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood automotive and industrial edge controllers. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE), 3mm × 4.9mm body, exposed pad (Pin 17) tied to GND - thermally enhanced for 40°C/W θJA in standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS (Pin 1) | Soft-start ramp control | Internal 12.5µA pull-up charges external capacitor; linearly scales VFB reference from 0V to 1.2V, controlling output voltage slew rate during startup. |
| SENSE– (Pin 2) | Negative current sense input | Differential input to current comparator; referenced against SENSE+ to detect inductor peak current via RSENSE or DCR voltage drop. |
| SENSE+ (Pin 3) | Positive current sense input | Supplies current to comparator when >INTVCC; enables accurate high-side sensing without additional op-amps or level-shifters. |
| VFB (Pin 4) | Feedback voltage input | Compares output divider voltage against 1.200V reference; sets regulated output as VOUT = 1.2V × (1 + R1/R2). |
| ITH (Pin 5) | Error amplifier output & compensation node | Controls current limit threshold and loop stability; connects to RC network for OPTI-LOOP compensation across varied output caps. |
| RUN (Pin 6) | Enable/shutdown control | 1.2V threshold disables switching; <0.7V forces full shutdown (1.2μA IQ); supports UVLO implementation with external resistor divider. |
| FREQ (Pin 7) | Frequency programming input | Resistor-to-GND sets 100kHz–3MHz; tie to INTVCC for 2.25MHz or GND for 375kHz - avoids external clock source in standalone applications. |
| PLLIN/SPREAD (Pin 8) | Sync input / spread spectrum enable | Tie to INTVCC for EMI-reducing dithering; apply external clock for phase synchronization - eliminates beat frequencies in multi-rail systems. |
| MODE (Pin 9) | Light-load operation mode select | GND = Burst Mode (lowest IQ); INTVCC = forced continuous; 100kΩ-to-INTVCC = pulse-skipping - balances efficiency vs. output ripple per application need. |
| INTVCC (Pin 10) | Internal 5.15V LDO output | Powers gate drivers and analog circuits; requires ≥4.7µF ceramic decoupling; switchover to EXTVCC occurs at 4.7V with 250mV hysteresis. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Accepts 0–30V; bypasses VBIAS LDO when ≥4.7V - improves efficiency by using downstream converter output instead of raw input. |
| VBIAS (Pin 12) | Main bias supply input | Primary power source for internal LDO; typically connected to VIN or VOUT; must be bypassed with local ceramic capacitor. |
| BG (Pin 13) | Bottom N-MOSFET gate driver | Ground-referenced 5.15V swing; drives main switch with 1.5Ω pull-down resistance - optimized for fast turn-off and shoot-through prevention. |
| BOOST (Pin 14) | Bootstrap supply for top driver | Connects to SW via capacitor and to INTVCC via Schottky diode; sustains floating gate drive for TG during high-duty-cycle operation. |
| TG (Pin 15) | Top N-MOSFET gate driver | Floating output with INTVCC swing superimposed on SW node; delivers 3.0Ω pull-up/1.5Ω pull-down for robust high-side switching. |
| SW (Pin 16) | Switch node connection | Direct interface to inductor and external MOSFETs; high dv/dt node requiring minimized trace length and guard ring for EMI control. |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad; must be soldered to PCB plane - provides primary thermal path and low-impedance return for high-current paths and sensitive analog signals. |
Key Features
| Feature | Design Value |
|---|---|
| Spread spectrum modulation | Reduces peak conducted/EMI by shifting oscillator frequency ±10% around center - simplifies compliance with CISPR 25 Class 5 in automotive power systems. |
| Pass-Thru™ 100% duty cycle | Enables seamless transition when VIN approaches or exceeds VOUT - eliminates dropout and maintains regulation during input transients like load dump recovery. |
| OPTI-LOOP compensation | Allows single-pole compensation network to stabilize loops with diverse output capacitors (ceramic, polymer, tantalum) and ESR values - reduces design iterations. |
| RSENSE or DCR current sensing | Supports both discrete shunt resistors and inductor DCR sensing - eliminates extra components while maintaining accuracy across temperature (±10% DCR drift compensated). |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with HTOL, TC, and ESD testing - meets functional safety requirements for ASIL-B automotive subsystems. |
| Low minimum on-time (80ns) | Enables high step-up ratios (e.g., 5V→36V) at 2MHz switching - supports compact magnetics and high-density power delivery in space-constrained ECUs. |
Applications
| Automotive Infotainment Power | Industrial Sensor Bias Supply |
|---|---|
|
Use Scenario: Generating stable 24V rail from 9–16V vehicle battery for LCD backlight drivers and audio amplifiers. IC Role / Device Role / Timing Role: Synchronous boost controller managing high-efficiency voltage step-up with spread spectrum EMI suppression to pass CISPR 25. Use Value: 14μA quiescent current prevents battery drain during vehicle sleep mode; Pass-Thru™ maintains output during cranking dips below 8V. |
Use Scenario: Providing isolated 36V bias for piezoelectric pressure sensors in factory automation equipment. IC Role / Device Role / Timing Role: High-voltage boost controller delivering regulated output with low ripple and precise current limiting for sensor excitation. Use Value: 50mV current sense threshold enables accurate overcurrent protection with 10mΩ shunt; 125°C rating supports operation near hot machinery. |
| Telecom Remote Radio Unit | Military Data Link Transceiver |
|
Use Scenario: Converting 48V backplane supply to 28V for RF power amplifiers in 5G small cells. IC Role / Device Role / Timing Role: High-frequency (2.25MHz) boost controller enabling compact filter design and reduced board area. Use Value: Phase-lockable frequency synchronizes multiple converters to suppress beat frequencies; 40V absolute max input withstands 48V transient surges. |
Use Scenario: Powering encrypted data link modems in airborne platforms with stringent EMI and thermal constraints. IC Role / Device Role / Timing Role: AEC-Q100-qualified boost controller operating from 28V aircraft bus to generate 15V/3A for FPGA and RF ICs. Use Value: Spread spectrum + 1.2μA shutdown current meets MIL-STD-461 RS103 and DO-160 Section 20 requirements; exposed pad ensures thermal reliability at altitude. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4316-AEC1 | Fixed 500kHz frequency; no spread spectrum; 2.5A integrated MOSFETs; lower max input (36V); no PLL sync. | Suitable for cost-sensitive, lower-power (<15W) automotive modules where EMI filtering is handled externally. | Select when integration and BOM count reduction outweigh programmability and EMI flexibility. |
| LM5122MQ | Higher IQ (2.5mA); no spread spectrum; 65V max input; supports external VDD bias; no AEC-Q100 grade. | Preferred for industrial HV inputs (e.g., 48V PoE++ systems) where extended input range and ruggedness dominate. | Choose when input exceeds 40V or when higher fault tolerance (OVP/OCP/OTP) is required over ultra-low IQ. |
Compared with MPQ4316-AEC1 and LM5122MQ, the LTC7804IMSE#PBF uniquely combines AEC-Q100 qualification, sub-15μA quiescent current, spread spectrum, and phase-lockable frequency - making it optimal for next-generation automotive and aerospace power systems demanding lowest EMI and longest battery life.
Availability
LTC7804IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor bias, and military data link applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LTC7804IMSE#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, communications, and automotive markets since 1965.
The LTC7804 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, and automotive-qualified DC/DC conversion in harsh environments with wide input ranges and stringent reliability demands.
FAQ
What is the maximum input voltage rating for the LTC7804IMSE#PBF?
The LTC7804IMSE#PBF has an absolute maximum VBIAS rating of 40V and can operate continuously from 4.5V to 40V. Its VIN range extends down to 1V after startup when biased from the output, but the absolute maximum voltage on any pin - including VBIAS, SENSE+, SENSE−, and BOOST - remains 40V or 46V respectively per Absolute Maximum Ratings table. Exceeding these limits risks permanent damage.
How does the MODE pin configure light-load operation on the LTC7804IMSE#PBF?
The MODE pin on the LTC7804IMSE#PBF selects among three light-load modes: grounding the pin enables Burst Mode® (lowest IQ, ~14μA); tying it to INTVCC forces continuous conduction; connecting it to INTVCC through a 100kΩ resistor enables pulse-skipping. An internal 100kΩ pull-down ensures Burst Mode defaults when left floating - critical for fail-safe behavior in automotive systems.
Can the LTC7804IMSE#PBF operate with inductor DCR current sensing?
Yes, the LTC7804IMSE#PBF supports both RSENSE and inductor DCR current sensing. The SENSE+ and SENSE− pins form a differential comparator that accepts the voltage drop across either a discrete shunt or the inductor's DCR. The datasheet provides DCR compensation guidelines and recommends filtering networks to reject switching noise - enabling accurate current limiting without added components.
What thermal performance can be expected from the LTC7804IMSE#PBF in MSOP package?
The LTC7804IMSE#PBF in the 16-lead MSOP (MSE) package has θJA = 40°C/W and θJC = 10°C/W when the exposed pad (Pin 17) is properly soldered to a 1-in² copper pour. At 12V→24V/6A operation, typical power dissipation is ~1.2W; with ambient at 85°C, junction temperature reaches ~133°C - within its –40°C to +125°C rated range only with adequate PCB copper and airflow.
Is spread spectrum enabled by default on the LTC7804IMSE#PBF?
No, spread spectrum is not enabled by default. It is activated only when the PLLIN/SPREAD pin is tied to INTVCC. If left floating or grounded, spread spectrum is disabled and the oscillator runs at fixed frequency. Tying PLLIN/SPREAD to INTVCC introduces ±10% frequency dithering - reducing peak EMI by up to 10dB - which must be verified per application layout and filter design.
LTC7804IMSE#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
LTC7804IMSE#PBF FAQ
1.How can I place an order for LTC7804IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7804IMSE#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 LTC7804IMSE#PBF reliable?
The price and inventory of LTC7804IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7804IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7804IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7804IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7804IMSE#PBF?
LTC7804IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7804IMSE#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 LTC7804IMSE#PBF?
For technical support, including LTC7804IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7804IMSE#PBF requirements.
6.How does Aetrix verify that LTC7804IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7804IMSE#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 LTC7804IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7804IMSE#PBF?
All LTC7804IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7804IMSE#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 LTC7804IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7804IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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