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Analog Devices Inc. LTC3807IUDC#PBF
- Part No.:
- LTC3807IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3807IUDC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,574
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Product details
Overview
LTC3807IUDC#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, 50μA no-load quiescent current, and operates in Burst Mode®, pulse-skipping, or forced continuous mode - ideal for battery-powered digital systems requiring ultra-low standby power.
For engineers reviewing the LTC3807IUDC#PBF datasheet, LTC3807IUDC#PBF pinout, LTC3807IUDC#PBF application, or LTC3807IUDC#PBF equivalent, key selection criteria include its 20-pin 3mm × 4mm QFN package, selectable current limit via ILIM pin, OPTI-LOOP® compensation for wide ESR/output capacitance tolerance, and precision 0.8V reference with ±1.2mV initial accuracy over temperature.
Technical Context
The LTC3807IUDC#PBF implements a current-mode control architecture with dual gate drivers (TG/BG), internal 5.1V LDO (INTVCC), and programmable oscillator using FREQ pin bias current (20μA). Its PLLIN/MODE pin configures light-load behavior across three distinct modes - Burst Mode® (50μA IQ), pulse-skipping, or forced continuous - each with deterministic transient response and no current foldback during startup.
It features differential current sensing (SENSE+/SENSE−) supporting RSENSE or DCR methods, adjustable overcurrent threshold via ILIM pin (GND/FLOAT/INTVCC), and robust protection including output overvoltage detection (±10% VFB trip), PGOOD open-drain flag, and dropout recovery with BOOST capacitor recharge management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports wide intermediate bus and multi-cell battery inputs without external pre-regulation. |
| Output Voltage Range | 0.8V to 24V - set via external resistor divider on VFB; 0.800V ±1.2mV reference enables accurate low-VOUT regulation. |
| No-Load Quiescent Current | 50μA in Burst Mode - extends runtime in always-on battery systems such as automotive infotainment or portable medical devices. |
| Switching Frequency Range | 75kHz to 750kHz PLL-synchronizable - allows noise-sensitive system clock alignment and EMI reduction via spread-spectrum compatibility. |
| Gate Driver Strength | TG pull-up: 2.5Ω, BG pull-down: 1.1Ω - drives high-side and low-side N-MOSFETs with fast 13–25ns transitions for <100ns dead-time control. |
| Current Sense Threshold Options | 22mV / 43mV / 64mV (ILIM = GND/FLOAT/INTVCC) - enables precise, scalable overcurrent protection across 5A–30A output designs. |
| Soft-Start & Tracking | Internal 10μA TRACK/SS pull-up - sets monotonic VOUT ramp time with external capacitor; supports supply sequencing in multi-rail systems. |
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 (19) | Soft-start & tracking input | Regulates VFB to min(0.8V, TRACK/SS voltage); internal 10μA pull-up enables linear ramp with external capacitor. |
| FREQ (20) | Oscillator frequency control | 20μA internal current source develops voltage across external resistor to set 50kHz–900kHz fixed or PLL-synchronized frequency. |
| PLLIN/MODE (1) | Light-load operation mode select | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping - determines efficiency vs. ripple trade-off at light load. |
| SGND (2,3,21) | Small-signal ground reference | Must be isolated from PGND; pins 2/3 and exposed pad (21) require low-impedance connection to minimize noise coupling into error amplifier. |
| RUN (4) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down INTVCC LDO and reduces IQ to 14μA - supports UVLO implementation via resistor divider. |
| SENSE– (5), SENSE+ (6) | Differential current sense inputs | Measure voltage across RSENSE or DCR network; common-mode range up to 28V enables high-side sensing in buck configurations. |
| VFB (7) | Feedback voltage input | Compares output divider voltage to 0.800V reference; ±5nA input bias enables high-impedance dividers without gain error. |
| ITH (8) | Error amplifier output & compensation node | Directly controls peak inductor current; connects to RC/CC network for OPTI-LOOP® compensation across wide capacitor ESR ranges. |
| PGOOD (9) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from target; 25μs fault delay prevents false triggering during transients. |
| TG (10) | Top-gate driver output | Floating driver referenced to SW node; swing = INTVCC superimposed on SW - requires BOOST capacitor and Schottky diode for bootstrap operation. |
| SW (11) | Switch node connection | Connects to inductor and MOSFET bridge midpoint; handles full switching dv/dt and must be minimized in layout to reduce EMI. |
| BOOST (12) | Bootstrap supply for TG driver | Capacitor between BOOST and SW provides floating rail; clamped to (VIN + INTVCC) max - critical for high-duty-cycle (>98%) operation. |
| BG (13) | Bottom-gate driver output | Ground-referenced driver; swing = 0V to INTVCC - directly drives synchronous rectifier MOSFET source-to-ground. |
| INTVCC (14) | Internal LDO output | 5.1V ±3%, powers gate drivers and control logic; decoupled with ≥2.2µF ceramic to PGND - bypasses VIN LDO when EXTVCC >4.7V. |
| EXTVCC (15) | External bias input for INTVCC LDO | Enables higher-efficiency biasing from regulated output rail (e.g., VOUT); switchover at 4.7V ±250mV hysteresis eliminates supply conflict. |
| PGND (16) | Power ground return | Connects to bottom MOSFET source and CIN(–); must tie to thermal pad and remain separate from SGND to avoid ground bounce in high-di/dt paths. |
| VIN (17) | Main input supply | Accepts 4V–38V; requires local 10µF ceramic bypass to SGND near pin - feeds internal VIN LDO when EXTVCC is inactive. |
| ILIM (18) | Current limit threshold select | GND = 22mV, FLOAT = 43mV, INTVCC = 64mV - sets comparator trip point without external resistors, simplifying overcurrent design. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Transconductance amplifier (gm = 2 mmho) with ITH node allows stable loop tuning across 10µF–1000µF output capacitors and 1mΩ–100mΩ ESR - eliminates trial-and-error compensation. |
| Selectably Programmable Light-Load Mode | Three distinct operational modes (Burst/Pulse-Skipping/Forced Continuous) configured via single PLLIN/MODE pin - enables optimal efficiency vs. output ripple trade-off per application requirement. |
| 99% Maximum Duty Cycle | Dropout detector forces periodic top-FET off-time to recharge BOOST capacitor - sustains regulation down to VOUT ≈ VIN – 0.3V, critical for high-VIN/low-VOUT conversion. |
| Integrated Dual LDO Architecture | VIN-fed and EXTVCC-fed LDOs share INTVCC rail with automatic switchover at 4.7V - enables efficient self-biasing from output rail while maintaining start-up capability from input. |
| Robust Protection Suite | Includes output overvoltage lockout (±10% VFB trip), PGOOD monitoring, undervoltage lockout (3.8V rising), and no current foldback during soft-start - ensures safe power-up under fault conditions. |
Applications
| Automotive Infotainment Systems | Portable Medical Monitoring Devices |
|---|---|
Use Scenario: Powering DSPs, displays, and audio codecs in 12V vehicle electrical systems with strict EMC and low-quiescent requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 3.3V/5V rails from 7V–16V battery input; operates in Burst Mode® during sleep states. Use Value: 50μA no-load IQ extends battery life >3× versus conventional controllers; 750kHz PLL sync avoids interference with CAN/LIN bus clocks. | Use Scenario: Supplying microcontroller, sensor interface, and wireless transceiver in handheld ECG or glucose meters powered by Li-ion cells. IC Role / Device Role / Timing Role: High-efficiency step-down controller converting 3.6V–4.2V battery to 1.8V/3.3V system rails; uses TRACK/SS for controlled power-up sequencing. Use Value: 0.8V reference enables accurate low-VOUT regulation; 20-pin QFN minimizes PCB area in space-constrained enclosures. |
| Distributed Telecom Power Systems | Industrial PLC I/O Modules |
Use Scenario: Generating isolated 12V/5V intermediate rails from 48V backplane in modular telecom equipment with thermal constraints. IC Role / Device Role / Timing Role: Non-isolated buck controller driving discrete N-MOSFETs; configured for forced continuous mode to meet ripple specs for FPGA core supplies. Use Value: 4V–38V input range accommodates 48V nominal with 20% tolerance; 99% duty cycle maintains regulation during brownouts. | Use Scenario: Providing 24V-to-5V/3.3V conversion for microcontroller, analog front-end, and fieldbus transceivers in DIN-rail mounted automation modules. IC Role / Device Role / Timing Role: Main DC/DC controller with PGOOD signaling to system supervisor IC; ILIM pin set to 43mV for 15A output current limit. Use Value: Wide –40°C to 125°C operating range meets industrial ambient requirements; EXTVCC option enables efficient self-biasing from 5V rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3855IUFD#PBF | Higher integration: integrated 5V/1.2A LDO, dual-phase capable, 2MHz max frequency, but larger 28-pin QFN package. | Targeted at higher-current, multi-phase, or space-tolerant designs where board area is less constrained than thermal budget. | Choose LTC3855IUFD#PBF when needing integrated biasing and >20A output capability; LTC3807IUDC#PBF remains optimal for compact, ultra-low-IQ single-phase systems. |
| MP2918GL-Z | Monolithic solution (integrated MOSFETs), 4.5V–36V input, 0.6V–25V output, 100μA IQ, no PLL sync, smaller 16-pin QFN. | Suitable for lower-power (<10A), cost-sensitive applications where external MOSFET flexibility and sub-50μA IQ are not required. | Choose MP2918GL-Z for simplified BOM and layout in mid-power applications; LTC3807IUDC#PBF preferred when discrete MOSFET optimization, lowest IQ, or clock synchronization are mandatory. |
Compared with LTC3855IUFD#PBF and MP2918GL-Z, the LTC3807IUDC#PBF delivers the lowest quiescent current (50μA), widest input range (4V–38V), and unique PLL synchronization - making it the only choice for high-reliability, thermally constrained, noise-sensitive single-phase buck designs requiring long battery life and precise timing control.
Availability
LTC3807IUDC#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical devices, and distributed telecom power systems requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LTC3807IUDC#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 continuity, technical documentation, and manufacturing for all Linear power management ICs.
The LTC3807IUDC#PBF belongs to Linear's high-performance synchronous buck controller family, designed specifically for efficiency-critical, wide-input-range DC/DC conversion in battery-powered, automotive, and industrial systems where low IQ, precise regulation, and robust protection are essential.
FAQ
What is the absolute maximum input voltage rating for the LTC3807IUDC#PBF?
The LTC3807IUDC#PBF has an absolute maximum input supply voltage (VIN) rating of 40V. Exceeding this voltage, even momentarily, may cause permanent damage. The recommended operating range remains 4V to 38V, with proper derating and layout practices required to maintain reliability at upper limits. Always observe the 40V absolute maximum in system-level surge and transient protection design.
How does the ILIM pin configure current limit thresholds on the LTC3807IUDC#PBF?
The ILIM pin on the LTC3807IUDC#PBF selects one of three fixed current sense voltage thresholds: tying ILIM to SGND sets 22mV, floating sets 43mV, and connecting to INTVCC sets 64mV. These correspond to precise peak inductor current limits determined by the external sense resistor value (e.g., 22mV across 5mΩ = 4.4A peak). This eliminates need for external scaling resistors and simplifies overcurrent protection calibration.
Can the LTC3807IUDC#PBF operate with only the INTVCC LDO powered from VIN, without EXTVCC?
Yes, the LTC3807IUDC#PBF operates fully with INTVCC powered solely from VIN via its internal LDO - no EXTVCC connection is required. When EXTVCC is unconnected or below 4.7V, the VIN LDO automatically supplies 5.1V to INTVCC. EXTVCC is optional and used only to improve efficiency by powering INTVCC from a cleaner, regulated rail like the converter's own output.
What is the purpose of the exposed thermal pad (Pin 21) on the LTC3807IUDC#PBF QFN package?
The exposed thermal pad (Pin 21) on the LTC3807IUDC#PBF is electrically connected to SGND and must be soldered to a PCB copper pour for thermal and electrical performance. It reduces θJA from 43°C/W to typical values below 35°C/W when properly implemented, enabling reliable operation at full load in high-ambient environments. Failure to solder this pad degrades thermal performance and may trigger premature thermal shutdown.
Does the LTC3807IUDC#PBF support output voltage tracking during power-up?
Yes, the LTC3807IUDC#PBF supports precise output voltage tracking via the TRACK/SS pin. By connecting an external resistor divider from a master supply to TRACK/SS, the LTC3807IUDC#PBF regulates its VFB to match the TRACK/SS voltage - ensuring its output ramps synchronously with another rail. This enables safe sequencing in multi-supply FPGAs, processors, or mixed-signal ASICs without external supervision circuitry.
LTC3807IUDC#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)
LTC3807IUDC#PBF FAQ
1.How can I place an order for LTC3807IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807IUDC#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 LTC3807IUDC#PBF reliable?
The price and inventory of LTC3807IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3807IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807IUDC#PBF?
LTC3807IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807IUDC#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 LTC3807IUDC#PBF?
For technical support, including LTC3807IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807IUDC#PBF requirements.
6.How does Aetrix verify that LTC3807IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3807IUDC#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 LTC3807IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3807IUDC#PBF?
All LTC3807IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807IUDC#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 LTC3807IUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3807IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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