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Analog Devices Inc. LTC3807HUDC#PBF
- Part No.:
- LTC3807HUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3807HUDC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,894
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Product details
Overview
LTC3807HUDC#PBF 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#PBF datasheet, LTC3807HUDC#PBF pinout, LTC3807HUDC#PBF application, or LTC3807HUDC#PBF equivalent, key selection criteria include its –40°C to 150°C junction-rated QFN package, selectable light-load modes (Burst Mode®, pulse-skipping, forced CCM), RSENSE/DCR current sensing, and OPTI-LOOP® compensation for wide output capacitance/ESR tolerance.
Technical Context
The LTC3807HUDC#PBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and precision 0.8V reference (±0.8% over temperature). Its PLLIN/MODE pin selects among Burst Mode® (50μA IQ), pulse-skipping, or forced continuous conduction - each altering inductor current waveform and efficiency profile at light loads.
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 up to 750kHz). The device uses OPTI-LOOP® compensation and includes output overvoltage protection, power-good monitoring, and adjustable soft-start/tracking via TRACK/SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports 12V/24V intermediate bus and wide battery chemistries (Li-ion, lead-acid, 3S–10S). |
| Output Voltage Range | 0.8V to 24V - programmable via resistive divider; 0.8V ±0.8% reference enables precise regulation down to sub-1V logic rails. |
| No-Load Quiescent Current | 50μA in Burst Mode® - extends runtime in always-on automotive or IoT edge nodes with microamp-level standby budgets. |
| Switching Frequency | 50kHz to 900kHz (programmable); 75kHz–750kHz (PLL-sync capable) - balances size (inductor/capacitor) vs. EMI and light-load efficiency. |
| Current Sense Threshold | 22mV to 85mV (selectable via ILIM pin) - accommodates low-value RSENSE or DCR sensing while maintaining accuracy across temperature. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive, industrial power supplies, and high-ambient embedded systems. |
| Package | 20-pin 3mm × 4mm QFN with exposed thermal pad (Pin 21 = SGND) - θJA = 43°C/W; requires PCB soldering of exposed pad for thermal compliance. |
Pinout & Package
20-pin 3mm × 4mm plastic QFN (UDC package) with exposed thermal pad (Pin 21 = SGND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TRACK/SS) | Soft-start & tracking control input | Internal 10µA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor-divider voltage to track another supply during startup. |
| 2 (FREQ) | VCO frequency programming | 20µA internal pull-up sets oscillator frequency; GND = 350kHz, INTVCC = 535kHz, resistor-to-GND enables 50–900kHz tuning. |
| 3 (PLLIN/MODE) | Light-load mode & sync input | GND = Burst Mode®, INTVCC = forced CCM, 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock input enables phase-locking up to 750kHz. |
| 4 (RUN) | Enable/shutdown control | 1.16V threshold disables control loop; 0.7V threshold shuts down entire IC (IQ = 14µA); internal 7µA pull-up allows floating for always-on operation. |
| 5 (SENSE–) | Current sense comparator negative input | Reference node for differential current sensing; supplies bias current to comparator when > INTVCC – 0.5V. |
| 6 (SENSE+) | Current sense comparator positive input | Connects to RSENSE or DCR network; trip threshold set by ITH voltage and ILIM pin state (22/43/64mV options). |
| 7 (VFB) | Feedback voltage input | Compares output voltage (via external divider) to 0.8V reference; ±5nA input bias minimizes divider error. |
| 8 (ITH) | Error amplifier output & compensation node | Controls peak inductor current; connects to RC/CC network for OPTI-LOOP® compensation across wide COUT/ESR range. |
| 9 (PGOOD) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; 2mA sink capability drives LED or system enable logic. |
| 10 (TG) | Top N-MOSFET gate driver output | Floating driver with 2.5Ω pull-up / 1.5Ω pull-down; swing = INTVCC superimposed on SW node; supports high-side drive in buck topology. |
| 11 (SW) | Switch node connection | Connects to inductor and source of bottom MOSFET; high dV/dt node requiring tight layout and Kelvin sensing for stability. |
| 12 (BOOST) | Bootstrap supply for top gate driver | Capacitor between BOOST and SW provides floating bias; Schottky diode from BOOST to INTVCC prevents reverse discharge. |
| 13 (BG) | Bottom N-MOSFET gate driver output | Ground-referenced driver with 2.4Ω pull-up / 1.1Ω pull-down; 25ns rise/fall time supports efficient synchronous rectification. |
| 14 (INTVCC) | Internal LDO output (5.1V) | Powers gate drivers and analog circuitry; sourced from VIN (4.85–5.35V) or EXTVCC (>4.7V); requires ≥2.2µF ceramic decoupling to PGND. |
| 15 (EXTVCC) | External bias input for INTVCC LDO | Bypasses VIN LDO when >4.7V; reduces power loss in high-efficiency designs (e.g., using LTC3807's own VOUT as EXTVCC source). |
| 16 (PGND) | Power ground return | Connects to source of bottom MOSFET and negative terminal of input capacitor; must be separate from SGND except at single-point star ground. |
| 17 (VIN) | Main input supply | 4V–38V input; bypassed to SGND with low-ESR capacitor; powers internal VIN LDO when EXTVCC is inactive. |
| 18 (ILIM) | Current limit threshold select | GND = 22mV, FLOAT = 43mV, INTVCC = 64mV - configures current-sense gain without external components. |
| 19 (SGND) | Small-signal ground | Must be routed separately from PGND; pins 2,3,21 all connect to SGND; critical for noise immunity in feedback and current sense paths. |
| 20 (SGND) | Small-signal ground | Duplicate SGND pin for robust grounding; electrically tied to Pin 2 and Pin 21; improves layout flexibility and reduces ground impedance. |
| 21 (SGND) | Exposed thermal pad | Internally connected to SGND; must be soldered to PCB ground plane for thermal and electrical integrity; defines θJA = 43°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 50μA while maintaining regulated output - essential for automotive "always-on" modules meeting ISO 16750-2 quiescent current limits. |
| OPTI-LOOP® Compensation | Enables stable loop response across 10× variation in output capacitance and ESR - eliminates re-tuning when changing bulk/MLCC/Ceramic capacitor types. |
| Selectably Programmable Light-Load Modes | Three distinct modes (Burst, pulse-skip, forced CCM) allow trade-off between light-load efficiency, output ripple, and EMI - configurable per application need without hardware change. |
| Wide Output Voltage Range (0.8V–24V) | Supports both low-voltage logic rails (e.g., 1.2V FPGA core) and high-voltage intermediate buses (e.g., 12V/24V motor control) with same controller IC. |
| Robust Overvoltage Protection | Monitors VFB with ±10% trip threshold and 2.5% hysteresis - protects downstream loads from catastrophic failure due to feedback divider fault or open-circuit. |
| High-Temperature Qualified QFN | Rated for –40°C to +150°C junction operation - validated for under-hood automotive, industrial motor drives, and aerospace power subsystems. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Power management for telematics control units (TCUs), ADAS domain controllers, and infotainment head units requiring <100μA standby current and operation down to cold-crank 4.5V. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 5V/3.3V/1.2V rails from 12V battery; manages soft-start sequencing and power-good handshaking with MCU. Use Value: 50μA Burst Mode® IQ meets OEM requirements for ignition-off leakage; 150°C rating ensures reliability in sealed enclosures near engine compartments. |
Use Scenario: Portable medical monitors, handheld test equipment, and ruggedized tablets operating from Li-ion (3.0–4.2V) or multi-cell alkaline packs. IC Role / Device Role / Timing Role: High-efficiency step-down controller generating stable 3.3V/1.8V rails; tracks main system rail during hot-plug battery insertion. Use Value: 99% duty cycle dropout operation maintains regulation during battery sag; TRACK/SS pin enables controlled voltage ramp to prevent inrush into large capacitive loads. |
| Distributed DC Power Systems | Industrial Embedded Power Supplies |
Use Scenario: Intermediate bus conversion in telecom/datacom systems where 24V or 48V backplane supplies feed point-of-load regulators. IC Role / Device Role / Timing Role: Wide-input (4V–38V) controller stepping 24V down to 12V/5V for downstream POL converters; synchronized via PLLIN/MODE to reduce system-level EMI. Use Value: Phase-lockable 75–750kHz operation enables deterministic switching alignment across multiple rails; RSENSE/DCR flexibility simplifies current sensing in high-current designs. |
Use Scenario: PLC I/O modules, motor drive auxiliary supplies, and factory automation sensors requiring long-term reliability in 60°C+ ambient environments. IC Role / Device Role / Timing Role: Main 24V-to-5V/3.3V converter powering microcontrollers, isolated gate drivers, and analog front-ends; shutdown controlled via RUN pin for firmware-initiated power cycling. Use Value: –40°C to +150°C qualification ensures operation in uncooled enclosures; PGOOD output enables safe system reset and brown-out detection. |
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 |
|---|---|---|---|
| LTC3892-2 | Dual-output, 60V max input, 3.5mA typical IQ (no Burst Mode®), integrated bootstrap diode | Designed for higher-input industrial/motor drives; lacks ultra-low-IQ light-load optimization | Select when dual-rail generation or >38V input is required; not drop-in for low-IQ battery systems |
| MP2918 | Single-output, 36V max input, 100μA no-load IQ, fixed 500kHz frequency, no PLL sync | Lower-cost alternative with reduced feature set; no OPTI-LOOP®, no TRACK/SS, limited temp range (–40°C to 125°C) | Use in cost-sensitive industrial applications where 150°C rating and advanced compensation are unnecessary |
Compared with LTC3892-2 and MP2918, the LTC3807HUDC#PBF uniquely combines ultra-low 50μA Burst Mode® IQ, 150°C operation, and OPTI-LOOP® adaptability - making it optimal for thermally constrained, battery-sensitive, or automotive-qualified designs where light-load efficiency and long-term reliability are non-negotiable.
Availability
LTC3807HUDC#PBF is available at Aetrix Electronics and suitable for automotive always-on systems, battery-powered digital devices, and distributed DC power systems requiring stable component supply with guaranteed long-term availability and extended temperature support.
Supply support for LTC3807HUDC#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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for the LTC portfolio - a leader in high-performance analog and power management ICs.
The LTC3807 belongs to Linear's high-efficiency synchronous controller family, designed specifically for demanding DC/DC conversion in automotive, industrial, and portable applications where low quiescent current, wide input range, and robust thermal performance are critical.
FAQ
What is the maximum operating junction temperature for the LTC3807HUDC#PBF?
The LTC3807HUDC#PBF is specified for operation from –40°C to +150°C junction temperature. This H-grade qualification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section, with thermal derating applied above 125°C per Note 2. The device uses a 20-pin QFN package with θJA = 43°C/W, requiring proper PCB thermal design to maintain reliability at maximum ambient conditions.
How does the LTC3807HUDC#PBF achieve 50μA quiescent current in Burst Mode® operation?
The LTC3807HUDC#PBF achieves 50μA no-load IQ by entering sleep mode when the ITH voltage drops below 0.425V - disabling most internal circuitry including gate drivers and error amplifier output. In this state, the ITH pin is parked at 0.450V, and only essential bias currents remain active. This behavior is explicitly defined in the Light Load Current Operation section and verified in Figure G17 (Quiescent Current vs Temperature).
Can the LTC3807HUDC#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3807HUDC#PBF supports external synchronization via the PLLIN/MODE pin. When an external clock is applied, the internal phase-locked loop aligns the rising edge of the TG signal to the external clock's rising edge. The device accepts external clocks from 75kHz to 750kHz, as confirmed in the Oscillator and Phase-Locked Loop table and Figure G24 (Oscillator Frequency vs Temperature).
What are the three current sense threshold options on the LTC3807HUDC#PBF, and how are they selected?
The LTC3807HUDC#PBF offers three programmable current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), and 64mV (ILIM = INTVCC). These values are specified in the Electrical Characteristics table under VSENSE(MAX) and are selected solely by the voltage applied to the ILIM pin - no external resistors or calibration required. This simplifies design across varying RSENSE values or DCR-based sensing networks.
Does the LTC3807HUDC#PBF support output voltage tracking, and how is it implemented?
Yes, the LTC3807HUDC#PBF supports output voltage tracking via the TRACK/SS pin. When an external resistor divider from a master supply is connected to TRACK/SS, the controller regulates VFB to match the TRACK/SS voltage - causing VOUT to ramp in parallel with the master rail. This is detailed in the PIN FUNCTIONS section and demonstrated in Figure G09 (Tracking Start-Up), enabling coordinated power sequencing in multi-rail systems.
LTC3807HUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3807HUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807HUDC#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 LTC3807HUDC#PBF reliable?
The price and inventory of LTC3807HUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807HUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3807HUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807HUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807HUDC#PBF?
LTC3807HUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807HUDC#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 LTC3807HUDC#PBF?
For technical support, including LTC3807HUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807HUDC#PBF requirements.
6.How does Aetrix verify that LTC3807HUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3807HUDC#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 LTC3807HUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3807HUDC#PBF?
All LTC3807HUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807HUDC#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 LTC3807HUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3807HUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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