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Analog Devices Inc. LTC3807EUDC#PBF
- Part No.:
- LTC3807EUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3807EUDC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
LTC3807EUDC#PBF from Analog Devices (formerly Linear Technology) is a high-performance, constant-frequency current-mode synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It supports 4V–38V input, 0.8V–24V output, 75kHz–750kHz phase-lockable switching frequency, 50μA no-load quiescent current, and operates in Burst Mode®, pulse-skipping, or forced continuous mode-enabling high-efficiency power conversion in battery-powered digital systems.
For engineers reviewing the LTC3807EUDC#PBF datasheet, LTC3807EUDC#PBF pinout, LTC3807EUDC#PBF application, or LTC3807EUDC#PBF equivalent, key selection criteria include its 20-pin 3mm × 4mm QFN package, OPTI-LOOP® compensation for wide output capacitance/ESR tolerance, precision 0.8V reference, power-good indicator, and selectable current limit via ILIM pin-critical for automotive always-on, distributed power, and low-IQ portable designs.
Technical Context
The LTC3807EUDC#PBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho), programmable oscillator (50–900 kHz), and phase-locked loop supporting external synchronization from 75 kHz to 750 kHz. Its dual-gate drivers deliver 2.5Ω TG pull-up and 1.5Ω BG pull-down on-resistance with <30 ns transition delays.
It features integrated protection including output overvoltage detection (±10% VFB trip), current foldback limiting, undervoltage lockout (3.6–4.2 V), and dropout operation up to 99% duty cycle. Power sequencing is enabled via TRACK/SS soft-start/tracking and RUN pin with 1.15–1.27 V turn-on threshold and 50 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports wide intermediate bus voltages and multiple battery chemistries (e.g., 12V, 24V, 36V Li-ion stacks). |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider; enables single-controller flexibility across logic rails and analog supplies. |
| No-Load Quiescent Current | 50μA - extends runtime in battery-backed systems by minimizing standby power loss. |
| Switching Frequency Range | 75kHz to 750kHz (PLL-sync) or 50kHz to 900kHz (fixed) - balances efficiency, size, and EMI in compact layouts. |
| Reference Voltage Accuracy | ±0.8% (0.792V–0.808V) over –40°C to 125°C - ensures tight output regulation across temperature without external trimming. |
| Gate Driver Strength | TG pull-up: 2.5Ω; BG pull-down: 1.1Ω - drives high-side and low-side N-MOSFETs with fast rise/fall times (<30 ns) and minimal dead-time loss. |
| Shutdown Current | 14μA - enables ultra-low-power system sleep states while retaining fast wake-up capability. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC) with exposed thermal pad (Pin 21 = SGND), rated for –40°C to 125°C operating junction temperature (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; accepts external voltage divider to track another supply during startup. |
| FREQ (Pin 20) | Oscillator frequency programming | 20μA internal pull-up sets VCO voltage; resistor-to-GND selects 50–900 kHz; tied to GND/INTVCC for fixed 350/535 kHz. |
| PLLIN/MODE (Pin 1) | Light-load mode selection & sync input | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock = PLL-synchronized operation. |
| SGND (Pins 2, 3, 21) | Small-signal ground reference | Must be routed separately from PGND; exposed pad (Pin 21) must be soldered to PCB ground for thermal and noise performance. |
| RUN (Pin 4) | Enable/shutdown control | 1.15–1.27 V turn-on threshold with 50 mV hysteresis; <0.7 V forces full shutdown (14μA IQ). |
| SENSE– / SENSE+ (Pins 5, 6) | Differential current sense inputs | Support RSENSE or DCR sensing; common-mode range up to 28V; bias current ±1 μA minimizes sensing error. |
| VFB (Pin 7) | Feedback voltage input | Compares output divider voltage to 0.8V internal reference; ±5 nA input current enables high-impedance dividers. |
| ITH (Pin 8) | Error amplifier output & compensation node | Controls peak inductor current; connects to RC network for OPTI-LOOP® compensation across wide COUT/ESR ranges. |
| PGOOD (Pin 9) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from setpoint; 2 mA sink capability supports direct MCU interrupt or enable signaling. |
| TG (Pin 10) | Top gate driver output | Floating driver with swing = INTVCC superimposed on SW node; drives high-side N-MOSFET gate with 2.5Ω pull-up. |
| SW (Pin 11) | Switch node connection | Connects to inductor and source of high-side MOSFET; critical for layout to minimize ringing and EMI. |
| BOOST (Pin 12) | Bootstrap supply for top gate 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 | Drives synchronous rectifier N-MOSFET gate from 0V to INTVCC; 1.1Ω pull-down ensures fast turn-off. |
| INTVCC (Pin 14) | Internal LDO output (5.1V) | Supplies gate drivers and control circuits; requires ≥2.2μF ceramic decoupling to PGND; bypassed by EXTVCC if >4.7V. |
| EXTVCC (Pin 15) | External bias input for INTVCC LDO | Enables higher-efficiency biasing from regulated output (e.g., VOUT); switchover at 4.5–4.9 V with 250 mV hysteresis. |
| PGND (Pin 16) | Power ground return | Connects to source of bottom MOSFET and negative terminal of input capacitor; must be low-inductance path. |
| VIN (Pin 17) | Main input supply | Accepts 4–38V; requires local ceramic bypass to SGND; powers internal VIN LDO when EXTVCC is inactive. |
| ILIM (Pin 18) | Current limit threshold select | SGND/FLOAT/INTVCC sets max sense voltage to 22/43/64 mV - configures current limit without external components. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitor values (e.g., 22μF–1000μF) and ESR ranges without redesigning compensation network. |
| Selectably Optimized Light-Load Efficiency | Burst Mode® (50μA IQ), pulse-skipping, or forced continuous operation - preserves efficiency down to µA loads without sacrificing transient response. |
| Programmable Current Limit | Three discrete thresholds (22/43/64 mV) selected by ILIM pin state - eliminates need for precision current-sense resistors in cost-sensitive applications. |
| 99% Maximum Duty Cycle | Enables operation in near-dropout conditions (e.g., VIN = 12.5V → VOUT = 12V), reducing minimum input requirement and improving system-level efficiency. |
| Integrated Output Overvoltage Protection | Monitors VFB directly; trips at ±10% deviation with 2.5% hysteresis and 25 µs fault reporting delay - protects downstream loads without external circuitry. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment head units, telematics modules, or ADAS sensors that remain active during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary step-down controller regulating 12V battery to 3.3V/5V logic rails with ultra-low 50μA quiescent current. Use Value: Extends vehicle battery life during extended parking; meets ISO 16750-2 quiescent current requirements for "always-on" ECUs. | Use Scenario: Supplying core voltage to portable medical monitors, handheld test equipment, or ruggedized tablets with limited battery capacity. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 10A at 3.3V from 12V Li-ion pack, using Burst Mode® to sustain weeks of standby time. Use Value: Achieves >90% efficiency at 100mA load and >85% at 10mA, directly extending operational runtime per charge cycle. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
Use Scenario: Intermediate bus converter in 48V telecom or server rack systems stepping down to 12V/5V distribution rails. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-current (10A+) point-of-load conversion with phase-lockable frequency for EMI reduction. Use Value: Enables synchronized switching across multiple converters to suppress beat frequencies and simplify filtering in dense PCB layouts. | Use Scenario: Power management for PLC I/O modules, motor drive logic, or industrial gateways requiring reliable start-up under varying input conditions. IC Role / Device Role / Timing Role: Robust controller with 4V–38V input range, TRACK/SS tracking for coordinated multi-rail sequencing, and PGOOD monitoring for system health checks. Use Value: Ensures deterministic power-up sequence across 3.3V, 5V, and 12V rails; withstands brownouts and cold-cranking events in harsh environments. |
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 |
|---|---|---|---|
| LTC3892EUF#PBF | Wider 4.5V–60V input range; dual-output; integrated MOSFET drivers support higher current (up to 20A); includes PMBus interface. | Suitable for higher-input industrial or automotive systems requiring dual outputs or telemetry; larger 28-pin QFN package. | Select when >38V input, dual rail, or digital monitoring is required; not drop-in due to pin count, footprint, and feature set differences. |
| MP2918GL-Z | Lower 4.5V–36V input; 500kHz fixed frequency; 60μA IQ; no PLL sync; smaller 16-pin QFN; lower cost. | Targeted at cost-sensitive consumer electronics where 750kHz sync or 24V output capability is unnecessary. | Choose for simplified BOM and layout where Burst Mode® efficiency and 24V output are not needed; verify ILIM and compensation compatibility. |
Compared with LTC3807EUDC#PBF, LTC3892EUF#PBF adds dual-output capability and telemetry but increases complexity and footprint, while MP2918GL-Z reduces cost and size at the expense of programmability, max output voltage, and synchronization-making LTC3807EUDC#PBF optimal for single-rail, high-flexibility, medium-power industrial and automotive applications.
Availability
LTC3807EUDC#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, long-term lifecycle support, and guaranteed performance across –40°C to 125°C.
Supply support for LTC3807EUDC#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 its legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive-grade qualification.
The LTC3807EUDC#PBF belongs to Linear's synchronous buck controller product line, designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in battery-critical and thermally constrained applications.
FAQ
What is the maximum output voltage supported by the LTC3807EUDC#PBF?
The LTC3807EUDC#PBF supports an output voltage range of 0.8V to 24V, set by an external resistor divider on the VFB pin. Its internal 0.8V reference and robust error amplifier enable precise regulation across this full span, making it suitable for both low-voltage logic rails and higher intermediate supplies like 12V or 15V analog subsystems.
How does the LTC3807EUDC#PBF achieve ultra-low quiescent current in Burst Mode® operation?
The LTC3807EUDC#PBF draws just 50μA in Burst Mode® by disabling most internal circuitry-including the gate drivers and oscillator-when load current drops below threshold. The ITH pin is parked at 0.450V, and the controller wakes only periodically to recharge the output capacitor, maintaining regulation while minimizing standby power loss in battery systems.
Can the LTC3807EUDC#PBF synchronize its switching frequency to an external clock source?
Yes-the LTC3807EUDC#PBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–750kHz) is applied, its internal phase-locked loop locks the rising edge of the TG signal to the external clock's rising edge, enabling EMI reduction through frequency alignment across multiple converters in the same system.
What package type and thermal characteristics does the LTC3807EUDC#PBF use?
The LTC3807EUDC#PBF uses a 20-lead 3mm × 4mm plastic QFN (UDC) package with an exposed thermal pad (Pin 21 = SGND). Its thermal resistance is θJA = 43°C/W, and it is rated for operation from –40°C to 125°C junction temperature-requiring proper PCB copper area and soldering of the exposed pad for reliable thermal performance.
Does the LTC3807EUDC#PBF include built-in protection features?
Yes-the LTC3807EUDC#PBF integrates output overvoltage protection (±10% VFB trip), undervoltage lockout (3.6–4.2 V), current foldback limiting, and short-circuit protection via current sense comparator. It also features a dedicated open-drain PGOOD output for system-level fault monitoring and sequencing control.
LTC3807EUDC#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC3807EUDC#PBF FAQ
1.How can I place an order for LTC3807EUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807EUDC#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 LTC3807EUDC#PBF reliable?
The price and inventory of LTC3807EUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807EUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3807EUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807EUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807EUDC#PBF?
LTC3807EUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807EUDC#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 LTC3807EUDC#PBF?
For technical support, including LTC3807EUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807EUDC#PBF requirements.
6.How does Aetrix verify that LTC3807EUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3807EUDC#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 LTC3807EUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3807EUDC#PBF?
All LTC3807EUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807EUDC#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 LTC3807EUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3807EUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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