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Analog Devices Inc. LTC3807HUDC#TRPBF
- Part No.:
- LTC3807HUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3807HUDC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,897
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Product details
Overview
LTC3807HUDC#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4V to 38V input, delivers 0.8V–24V output, supports up to 750kHz phase-lockable switching, and features 50μA no-load IQ - optimized for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3807HUDC#TRPBF datasheet, LTC3807HUDC#TRPBF pinout, LTC3807HUDC#TRPBF application, or LTC3807HUDC#TRPBF equivalent, key selection criteria include its wide input/output voltage range, selectable light-load modes (Burst Mode®, pulse-skipping, forced CCM), OPTI-LOOP® compensation, and 20-pin 3mm × 4mm QFN package with exposed thermal pad.
Technical Context
The LTC3807HUDC#TRPBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and precision 0.8V reference (±1.2mV over –40°C to 150°C). Its PLLIN/MODE pin selects among Burst Mode®, pulse-skipping, or forced continuous conduction at light loads - each altering switching behavior without changing loop dynamics.
It integrates dual gate drivers (TG/BG) with 2.5Ω pull-up / 1.5Ω pull-down on TG and 2.4Ω / 1.1Ω on BG, minimum on-time of 95ns, and programmable frequency (50–900kHz via FREQ pin resistor or external sync). The device uses RSENSE or DCR sensing and includes output overvoltage protection, power-good monitoring, and adjustable soft-start/tracking via the TRACK/SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports 12V/24V automotive buses and wide-range industrial intermediate rails. |
| Output Voltage Range | 0.8V to 24V - programmable via external resistive divider; enables single-controller flexibility across multiple rail requirements. |
| No-Load Quiescent Current | 50μA - extends battery runtime in always-on systems; verified over full –40°C to 150°C junction temperature range. |
| Switching Frequency | 50kHz to 900kHz - set by FREQ pin resistor or synchronized externally up to 750kHz; enables compact magnetics and EMI optimization. |
| Current Sense Threshold | 22mV to 85mV - selectable via ILIM pin (GND/FLOAT/INTVCC); allows precise current limiting across varied MOSFET RDS(on) and sense resistor values. |
| Gate Driver Strength | TG: 2.5Ω pull-up / 1.5Ω pull-down; BG: 2.4Ω / 1.1Ω - ensures fast, low-loss switching of high-side and synchronous low-side N-MOSFETs. |
| Thermal Rating | Junction temperature range: –40°C to 150°C - qualified for under-hood automotive applications per H-grade specification. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC) with exposed thermal pad (Pin 21 = SGND), rated for –40°C to 150°C operation. Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (Pin 19) | Soft-start & tracking control input | Internal 10µA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor-divider input to track another supply during startup. |
| FREQ (Pin 20) | Oscillator frequency programming | 20µA internal pull-up sets VCO voltage; resistor to GND selects 50–900kHz; tie to INTVCC/GND for fixed 535kHz/350kHz. |
| PLLIN/MODE (Pin 1) | Light-load mode & sync input | Pull to SGND → Burst Mode®; to INTVCC → forced CCM; to 1.2–(INTVCC–1.3)V → pulse-skipping; apply external clock → phase-locked operation. |
| SGND (Pins 2,3,21) | Small-signal ground reference | Must be routed separately from PGND; exposed pad (Pin 21) is SGND and must be soldered to PCB ground for thermal and noise integrity. |
| RUN (Pin 4) | Enable/shutdown control | <1.16V disables regulation; <0.7V shuts down entire IC (IQ = 14µA); internal 7µA pull-up enables floating "always-on" configuration. |
| SENSE– / SENSE+ (Pins 5,6) | Differential current sense inputs | Measure voltage across RSENSE or DCR network; common-mode range up to 28V; bias current ±1µA minimizes sensing error. |
| VFB (Pin 7) | Feedback voltage input | Compares output divider voltage to 0.8V internal reference; ±5nA input current enables high-impedance dividers without gain error. |
| ITH (Pin 8) | Error amplifier output & compensation node | Controls peak inductor current; connects to RC/CC network for OPTI-LOOP® compensation across wide ESR/capacitance ranges. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from setpoint; 2mA sink capability drives LED or microcontroller interrupt directly. |
| TG (Pin 10) | Top-gate driver output | Floating high-side driver with swing = INTVCC superimposed on SW node; 25ns rise/fall time into 3300pF load. |
| SW (Pin 11) | Switch node connection | Connects to drain of top MOSFET and inductor; voltage swings from ~0V to VIN; critical for layout to minimize ringing and EMI. |
| BOOST (Pin 12) | Bootstrap supply for TG driver | Capacitor between BOOST and SW provides floating bias; Schottky diode from BOOST to INTVCC prevents reverse discharge. |
| BG (Pin 13) | Bottom-gate driver output | Ground-referenced driver for synchronous N-MOSFET; 25ns rise/fall time; complements TG for efficient dead-time control. |
| INTVCC (Pin 14) | Internal LDO output (5.1V) | Powers gate drivers and control circuitry; requires ≥2.2µF ceramic decoupling to PGND; can be bypassed by EXTVCC ≥4.7V. |
| EXTVCC (Pin 15) | External bias input for INTVCC LDO | When ≥4.7V, disables VIN-based LDO and powers INTVCC from external source - improves efficiency in buck-derived bias schemes. |
| PGND (Pin 16) | Power ground return | Connects to source of bottom MOSFET and negative terminal of input capacitor; must be low-inductance path to minimize switching noise. |
| VIN (Pin 17) | Main input supply | Accepts 4V–38V; requires local ceramic bypass to SGND; absolute max 40V transient rating. |
| ILIM (Pin 18) | Current limit threshold select | Tie to SGND/FLOAT/INTVCC to set max sense voltage to 22/43/64mV (typical) - configures current foldback level without external components. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide output capacitance (10µF–1000µF) and ESR (0.5mΩ–100mΩ) without redesigning compensation network. |
| Selectably Optimized Light-Load Efficiency | Burst Mode® reduces IQ to 50µA while maintaining regulation; pulse-skipping balances ripple/noise; forced CCM eliminates subharmonics for sensitive analog loads. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation - e.g., 12V→11.8V conversion at high load - critical for post-regulation in distributed power systems. |
| Programmable Current Limit with Foldback | Three ILIM-selectable thresholds (22/43/64mV) plus automatic foldback during short-circuit reduce MOSFET thermal stress without external sensing resistors. |
| Robust Automotive H-Grade Qualification | Specified and tested over –40°C to 150°C junction temperature; meets AEC-Q100 stress test requirements for under-hood deployment. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Providing clean, regulated 5V/3.3V rails from 12V vehicle battery to MCU, display, and audio codecs in head units. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency conversion with dynamic load-step response and low-noise Burst Mode® during standby. Use Value: 50μA quiescent current prevents battery drain during vehicle sleep mode; 150°C rating ensures reliability near engine compartment heat sources. | Use Scenario: Generating isolated 12V and 5V auxiliary supplies from 24V DC field bus in programmable logic controllers. IC Role / Device Role / Timing Role: High-voltage input controller enabling compact, thermally robust power stages with programmable frequency to avoid noise-sensitive frequency bands. Use Value: 4V–38V input range accommodates brownout and surge conditions on industrial 24V lines; 99% duty cycle maintains regulation during undervoltage events. |
| Battery-Powered Test Equipment | Distributed Telecom DC-DC Converter |
Use Scenario: Portable oscilloscope or multimeter requiring long runtime from Li-ion pack (8.4V–12.6V) while powering mixed-signal analog and digital subsystems. IC Role / Device Role / Timing Role: Core step-down controller delivering tightly regulated outputs with soft-start sequencing and PGOOD signaling for system-level power management. Use Value: Adjustable soft-start via TRACK/SS prevents inrush current; 0.8V reference enables accurate low-voltage rails; low IQ extends usable battery life by hours. | Use Scenario: Intermediate bus converter in 48V telecom shelf supplying 12V/5V to line cards with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Synchronous controller supporting high-frequency (≥500kHz) operation to shrink magnetics and improve transient response across varying line/load conditions. Use Value: Phase-lockable frequency synchronizes multiple converters to suppress beat frequencies; EXTVCC option enables efficient self-bias from downstream 12V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | Fixed 500kHz frequency; no external sync; lower max input (30V); 65μA IQ; QFN-20 package | Lacks Burst Mode® and OPTI-LOOP®; limited to ≤30V input; less flexible compensation | Choose for cost-sensitive, fixed-frequency designs where 30V input ceiling and simpler layout are acceptable. |
| TPS53355DQPR | Integrated MOSFETs (30A); 4.5–25V input; 600kHz default; 2.5mA IQ; 32-pin QFN | Monolithic solution with higher integration but lower input voltage range and much higher no-load IQ | Choose when board space is constrained and integrated power stage suffices; avoid where 38V input or ultra-low IQ is required. |
Compared with MP2918GL-Z and TPS53355DQPR, the LTC3807HUDC#TRPBF uniquely combines 38V input capability, 50μA IQ, phase-lockable frequency, and OPTI-LOOP® - making it optimal for high-reliability, wide-input, low-power-loss applications where external MOSFETs are preferred for thermal or current scalability.
Availability
LTC3807HUDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, battery-powered test equipment, and distributed telecom DC-DC converters requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3807HUDC#TRPBF 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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3807HUDC#TRPBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding DC-DC conversion in automotive, industrial, and battery-critical applications where wide input range, low quiescent current, and thermal robustness are essential.
FAQ
What is the maximum operating junction temperature for the LTC3807HUDC#TRPBF?
The LTC3807HUDC#TRPBF is an H-grade part with a guaranteed operating junction temperature range of –40°C to 150°C. Its absolute maximum junction temperature is 150°C, and thermal design must ensure θJA = 43°C/W (QFN package) is maintained via proper PCB copper area and exposed pad soldering. Derating applies above 125°C for long-term reliability.
How does the LTC3807HUDC#TRPBF achieve 50μA quiescent current?
The LTC3807HUDC#TRPBF achieves 50μA no-load IQ through proprietary low-power biasing of its current-mode control loop and gate drivers, combined with intelligent sleep-mode activation when the ITH voltage drops below 0.425V. This occurs automatically in Burst Mode® operation at light loads, disabling non-essential circuitry while retaining regulation capability - a feature validated across –40°C to 150°C.
Can the LTC3807HUDC#TRPBF be synchronized to an external clock?
Yes, the LTC3807HUDC#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–750kHz) is applied, the internal phase-locked loop aligns the rising edge of the TG signal to the rising edge of that clock, enabling deterministic switching and EMI reduction in multi-converter systems - a function confirmed in the functional diagram and electrical characteristics table.
What is the purpose of the EXTVCC pin on the LTC3807HUDC#TRPBF?
The EXTVCC pin on the LTC3807HUDC#TRPBF provides an alternative input to the internal LDO that powers INTVCC. When EXTVCC exceeds 4.7V, the device switches from VIN-derived to EXTVCC-derived biasing, improving overall efficiency - especially when using the LTC3807HUDC#TRPBF's own regulated output (e.g., 12V) as the EXTVCC source, eliminating losses from the VIN LDO.
Does the LTC3807HUDC#TRPBF support output voltage tracking during startup?
Yes, the LTC3807HUDC#TRPBF supports output voltage tracking via the TRACK/SS pin. By connecting an external resistor divider from a master supply to the TRACK/SS pin, the LTC3807HUDC#TRPBF regulates its VFB to match the TRACK/SS voltage - ensuring coordinated, controlled ramp-up of multiple rails without sequencing ICs or complex timing circuits.
LTC3807HUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 38V
- Frequency - Switching:
- 50kHz ~ 900kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC3807HUDC#TRPBF FAQ
1.How can I place an order for LTC3807HUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807HUDC#TRPBF 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 LTC3807HUDC#TRPBF reliable?
The price and inventory of LTC3807HUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807HUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3807HUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807HUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807HUDC#TRPBF?
LTC3807HUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807HUDC#TRPBF 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 LTC3807HUDC#TRPBF?
For technical support, including LTC3807HUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807HUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3807HUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3807HUDC#TRPBF 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 LTC3807HUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3807HUDC#TRPBF?
All LTC3807HUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807HUDC#TRPBF, 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 LTC3807HUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3807HUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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