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Analog Devices Inc. LTC7804HMSE#PBF
- Part No.:
- LTC7804HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7804HMSE#PBF.pdf
- Description:
- LOW IQ SYNCH BOOST CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:1,299
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Product details
Overview
LTC7804HMSE#PBF from Analog Devices is a high-performance synchronous boost DC/DC controller driving all-N-channel MOSFET stages, featuring 4.5V–40V input range, 14μA no-load quiescent current, spread spectrum EMI reduction, and 100kHz–3MHz programmable switching frequency - used in automotive power supplies requiring AEC-Q100-compliant high-efficiency voltage boosting.
For engineers reviewing the LTC7804HMSE#PBF datasheet, LTC7804HMSE#PBF pinout, LTC7804HMSE#PBF application, or LTC7804HMSE#PBF equivalent, key selection criteria include low-IQ operation at 1V post-startup, Pass-Thru™ 100% duty cycle capability, RSENSE/DCR current sensing flexibility, and thermally enhanced MSOP-16 package rated to 150°C junction temperature.
Technical Context
The LTC7804HMSE#PBF implements a constant-frequency peak-current-mode control architecture with OPTI-LOOP compensation, enabling stable transient response across wide output capacitance and ESR variations. Its dual-mode gate drivers support synchronous rectification with 3Ω pull-up/pull-down resistance and <15ns transition delays.
It integrates phase-lockable oscillator with spread spectrum dithering (0–20% frequency deviation), selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), and dual power paths via INTVCC/EXTVCC LDOs - allowing efficient biasing from either VBIAS or external regulated supply ≥4.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V operating; supports down to 1V after startup when biased from output - enables cold-crank automotive operation. |
| No-Load Quiescent Current | 14μA typical - extends battery runtime in always-on systems like telematics or ADAS sensors. |
| Switching Frequency Range | 100kHz to 3MHz, programmable via resistor or PLL-synchronized - allows EMI optimization and compact magnetics design. |
| Feedback Reference Voltage | 1.200V ±12mV - sets precise output regulation with standard resistor dividers for outputs up to 40V. |
| Current Sense Threshold | 50mV typical - supports accurate current limiting with low-value sense resistors or DCR sensing. |
| Operating Junction Temperature | −40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| Shutdown Current | 1.2μA - minimizes leakage during system sleep states. |
Pinout & Package
Package: 16-lead plastic MSOP with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, rated for 150°C max junction temperature.
| 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 - controls output voltage slew rate during startup. |
| SENSE− (Pin 2) | Negative Current Sense Input | Differential input to current comparator; referenced to SENSE+ to set overcurrent trip point with ITH voltage. |
| SENSE+ (Pin 3) | Positive Current Sense Input | Accepts common-mode voltage up to 40V; supplies current to comparator when >INTVCC - enables high-side sensing. |
| VFB (Pin 4) | Feedback Input | Compares output divider voltage against 1.200V reference - primary regulation node for output voltage setting. |
| ITH (Pin 5) | Error Amplifier Output | Controls peak inductor current via current comparator threshold - compensation components connect here to GND. |
| RUN (Pin 6) | Enable/Shutdown Control | Below 1.2V disables switching; below 0.7V shuts down internal LDOs - enables UVLO or microcontroller-controlled sequencing. |
| FREQ (Pin 7) | Oscillator Programming | Resistor-to-GND sets frequency from 100kHz–3MHz; tied to INTVCC for 2.25MHz fixed operation. |
| PLLIN/SPREAD (Pin 8) | Synchronization & Spread Spectrum | External clock input for phase-locking; tied to INTVCC for spread spectrum noise reduction; tied to GND to disable dithering. |
| MODE (Pin 9) | Light-Load Operation Mode | GND = Burst Mode®; INTVCC = forced continuous; 100kΩ to INTVCC = pulse-skipping - selects efficiency vs. ripple trade-off. |
| INTVCC (Pin 10) | Internal 5.15V LDO Output | Powers gate drivers and analog circuitry; requires ≥4.7μF ceramic decoupling - critical for stability and drive strength. |
| EXTVCC (Pin 11) | External Bias Input | Enables bypass of VBIAS LDO when ≥4.7V applied - improves efficiency by using downstream regulator output as bias source. |
| VBIAS (Pin 12) | Main Bias Supply | Primary power input for internal LDO; typically connected to VIN or VOUT - must be bypassed with local ceramic capacitor. |
| BG (Pin 13) | Bottom Gate Driver | Drives N-channel MOSFET source to GND; swing from 0V to INTVCC - requires low-inductance layout for fast switching. |
| BOOST (Pin 14) | Bootstrap Supply | Charges floating driver for top MOSFET via external capacitor between BOOST and SW - enables high-side N-FET drive. |
| TG (Pin 15) | Top Gate Driver | Floating output referenced to SW node; swing = INTVCC superimposed on SW voltage - drives gate of high-side N-MOSFET. |
| SW (Pin 16) | Switch Node | Connection to inductor and MOSFET drains; high dv/dt node - demands tight layout and minimized parasitic inductance. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; connects to bottom MOSFET source, CIN/COUT negatives, and all small-signal grounds - must be soldered for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Modulation | Reduces peak conducted/radiated EMI by spreading oscillator energy across 0–20% bandwidth - simplifies compliance with CISPR 25 Class 5. |
| Pass-Thru™ Operation | Supports 100% duty cycle when VIN ≥ VOUT - maintains regulation during input voltage transients without dropout. |
| OPTI-LOOP Compensation | Enables single-pole compensation network to optimize transient response across diverse output capacitor types (ceramic, polymer, tantalum) and ESR values. |
| Low-Voltage Startup Capability | Operates from input as low as 1V after initial start-up - critical for automotive cold-crank and backup power applications. |
| AEC-Q100 Grade H Qualification | Validated for −40°C to +150°C operation with full reliability testing - meets automotive functional safety requirements for power conversion. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Bus Booster |
|---|---|
Use Scenario: Boosting 12V battery rail to 24V for LCD backlight and audio amplifiers in vehicle head units. IC Role / Device Role / Timing Role: Synchronous boost controller managing high-efficiency voltage translation with minimal thermal dissipation. Use Value: 14μA quiescent current prevents battery drain during vehicle sleep mode; AEC-Q100 qualification ensures reliability in under-dash environments. | Use Scenario: Stepping up industrial 12V/24V supply to 36V for PLC I/O modules requiring higher analog signal headroom. IC Role / Device Role / Timing Role: High-voltage boost controller delivering regulated output with programmable frequency to avoid sensitive communication bands. Use Value: 3MHz max switching frequency enables use of sub-2μH inductors; spread spectrum reduces EMI coupling into adjacent CAN/FlexRay interfaces. |
| Avionics Sensor Bias Supply | Telecom Remote Radio Unit (RRU) |
Use Scenario: Generating stable 15V bias from aircraft 28V DC bus for MEMS inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Precision feedback-controlled boost regulator with low-noise operation and robust overtemperature protection. Use Value: 1.200V ±12mV reference ensures <±1% output accuracy; 150°C junction rating supports operation near engine-mounted electronics. | Use Scenario: Providing 28V auxiliary supply from 48V telecom rectifier output for remote radio unit power amplifiers. IC Role / Device Role / Timing Role: High-efficiency synchronous boost controller supporting burst-mode operation during low-traffic periods. Use Value: Burst Mode® reduces standby power consumption by >5× versus continuous conduction; Pass-Thru™ avoids dropout during 48V brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7803HMSE#PBF | Lower max frequency (1MHz), no spread spectrum, no PLL synchronization - lacks EMI mitigation features. | Suitable for cost-sensitive non-automotive designs where EMI is less constrained. | Select LTC7804HMSE#PBF when spread spectrum, phase-locking, or >1MHz operation is required. |
| MP24913GQ-Z | Integrated MOSFETs (not controller-only); lower IQ (25μA), no AEC-Q100 qualification, fixed 500kHz frequency. | Applicable for space-constrained consumer/industrial designs needing integrated solution. | Choose LTC7804HMSE#PBF for discrete FET flexibility, ultra-low IQ, automotive qualification, and frequency programmability. |
Compared with LTC7803HMSE#PBF and MP24913GQ-Z, the LTC7804HMSE#PBF uniquely combines AEC-Q100 Grade H qualification, 14μA quiescent current, spread spectrum EMI reduction, and 100kHz–3MHz programmability - making it optimal for high-reliability automotive and industrial boost applications demanding both efficiency and regulatory compliance.
Availability
LTC7804HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V bus boosting, avionics sensor biasing, and telecom RRU power conversion requiring stable component supply and long-term lifecycle support.
Supply support for LTC7804HMSE#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 precision instrumentation, communications, and industrial markets.
The LTC7804 belongs to Analog Devices' Power by Linear™ high-efficiency DC/DC controller family, designed specifically for demanding automotive, industrial, and aerospace applications requiring ultra-low quiescent current, wide input range, and robust EMI performance.
FAQ
What is the maximum junction temperature rating for the LTC7804HMSE#PBF?
The LTC7804HMSE#PBF is rated for a maximum junction temperature of +150°C and is qualified per AEC-Q100 Grade H. This specification is validated through high-temperature life testing and thermal characterization, ensuring reliable operation in under-hood automotive environments and other high-ambient industrial settings where thermal management is critical. The MSOP-16 package includes an exposed thermal pad (Pin 17) that must be soldered to PCB copper for effective heat transfer.
Does the LTC7804HMSE#PBF support current sensing using inductor DCR?
Yes, the LTC7804HMSE#PBF supports both RSENSE and inductor DCR current sensing via its differential SENSE+ and SENSE− inputs. When using DCR sensing, an RC network is placed between SENSE+ and SENSE− to compensate for inductor impedance phase shift. The device's current comparator operates with a typical 50mV threshold, and the ITH voltage adjusts the trip point dynamically - enabling accurate peak-current-mode control regardless of sensing method.
How does the spread spectrum feature of the LTC7804HMSE#PBF reduce EMI?
The LTC7804HMSE#PBF reduces peak radiated and conducted EMI by modulating its switching frequency ±10% around the nominal value (0–20% total deviation) 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 Class 5 and FCC Part 15 limits without requiring additional filtering components or shielding.
Can the LTC7804HMSE#PBF operate with input voltage below 4.5V?
Yes - once started, the LTC7804HMSE#PBF can regulate with input voltage as low as 1V when biased from the output (VBIAS connected to VOUT). This "bootstrap" operation is enabled by its internal charge pump and low-IQ design. However, initial startup requires VBIAS ≥4.5V to power the internal LDOs and gate drivers. This capability is essential for automotive cold-crank scenarios where battery voltage dips below 6V.
What is the purpose of the EXTVCC pin on the LTC7804HMSE#PBF?
The EXTVCC pin on the LTC7804HMSE#PBF provides an alternative bias path for the INTVCC LDO: when EXTVCC ≥4.7V, the internal VBIAS LDO is disabled and power is sourced from EXTVCC instead. This improves overall system efficiency by allowing use of a high-efficiency downstream switching regulator output (e.g., from a buck converter) as the controller's bias supply - reducing losses compared to deriving bias directly from the high-voltage boost input rail.
LTC7804HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7804HMSE#PBF FAQ
1.How can I place an order for LTC7804HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7804HMSE#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 LTC7804HMSE#PBF reliable?
The price and inventory of LTC7804HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7804HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7804HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7804HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7804HMSE#PBF?
LTC7804HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7804HMSE#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 LTC7804HMSE#PBF?
For technical support, including LTC7804HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7804HMSE#PBF requirements.
6.How does Aetrix verify that LTC7804HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7804HMSE#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 LTC7804HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7804HMSE#PBF?
All LTC7804HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7804HMSE#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 LTC7804HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7804HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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