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Analog Devices Inc. LTC3807IUDC#TRPBF
- Part No.:
- LTC3807IUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3807IUDC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,017
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Product details
Overview
LTC3807IUDC#TRPBF 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 - ideal for battery-powered digital systems requiring ultra-low standby power.
For engineers reviewing the LTC3807IUDC#TRPBF datasheet, LTC3807IUDC#TRPBF pinout, LTC3807IUDC#TRPBF application, or LTC3807IUDC#TRPBF equivalent, key selection criteria include light-load efficiency mode selection (PLLIN/MODE), RSENSE/DCR current sensing flexibility, OPTI-LOOP® compensation tuning, 0.8V precision reference tolerance (±0.8%), and 99% maximum duty cycle for high-input, low-output dropout operation.
Technical Context
The LTC3807IUDC#TRPBF implements a peak-current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and programmable oscillator (50–900 kHz via FREQ pin or 75–750 kHz via PLLIN/MODE sync). Its dual LDO structure powers INTVCC from either VIN (4.5–38V) or EXTVCC (4.7–14V), enabling high-efficiency biasing from the regulated output rail.
It features three selectable light-load operating modes controlled by PLLIN/MODE: Burst Mode® (50μA IQ), pulse-skipping, or forced continuous conduction. Current limit is configurable via ILIM pin (GND/FLOAT/INTVCC), setting VSENSE(MAX) to 22/43/64 mV respectively, with foldback protection active during short-circuit conditions but disabled at startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports wide intermediate bus voltages and multi-cell Li-ion, lead-acid, or automotive batteries. |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider; 0.8V ±0.8% reference enables tight regulation at low VOUT. |
| No-Load Quiescent Current | 50μA in Burst Mode - extends battery runtime in always-on systems without compromising transient response. |
| Switching Frequency | 75kHz to 750kHz (phase-lockable) - allows EMI reduction via synchronization and optimization of size vs. efficiency trade-offs. |
| Max Duty Cycle | 99% - enables operation in near-dropout conditions (e.g., VIN = 12.5V → VOUT = 12V) with minimal voltage headroom. |
| Current Sense Threshold | 22/43/64 mV (ILIM-selectable) - sets precise overcurrent trip point while accommodating RSENSE or DCR sensing topologies. |
| Power Good Accuracy | ±10% VFB window with 25μs fault delay - provides reliable system-level power sequencing and fault reporting. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC) with exposed thermal pad (Pin 21 = SGND), rated for –40°C to 125°C junction temperature (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (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. |
| FREQ (20) | Oscillator frequency programming | 20µA internal pull-up sets VCO voltage; GND = 350kHz, INTVCC = 535kHz, resistor-to-GND enables 50–900kHz tuning. |
| PLLIN/MODE (1) | Light-load mode & sync input | GND = Burst Mode®, INTVCC = forced CCM, 1.2V–(INTVCC–1.3V) = pulse-skipping; also accepts external clock for synchronization. |
| ILIM (18) | Current limit range select | GND/FLOAT/INTVCC selects VSENSE(MAX) = 22/43/64 mV - configures current trip threshold without changing sense resistor. |
| TG (10) / BG (13) | Top/bottom gate drivers | TG swings from SW to (SW + INTVCC); BG swings from PGND to INTVCC - drives N-channel MOSFETs with 1.5Ω/1.1Ω typical on-resistance. |
| SENSE+ (6) / SENSE– (5) | Differential current sense inputs | Accepts Kelvin-connected RSENSE or DCR network; SENSE– supplies comparator bias when > INTVCC – 0.5V. |
| VFB (7) | Feedback input | Compares divided VOUT against 0.8V reference; ±5nA input bias enables high-impedance dividers with minimal error. |
| PGOOD (9) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from setpoint - used for system enable/disable sequencing and fault detection. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (22µF–1000µF) and ESR ranges without external component changes. |
| Selectably Low-Ripple Light-Load Operation | Burst Mode® delivers <15mVpp output ripple at 100µA load; pulse-skipping reduces audible noise vs. Burst Mode®. |
| No Current Foldback During Start-Up | Prevents premature current limiting during soft-start, ensuring reliable inrush handling into large output capacitors. |
| Internal LDO with EXTVCC Switchover | Automatically switches INTVCC sourcing from VIN to EXTVCC above 4.7V - improves efficiency when powering from regulated output rail. |
| 99% Duty Cycle Capability | Enables high-VIN/low-VOUT conversion (e.g., 12.5V→12V) without external bootstrap assist circuitry. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment microcontrollers and CAN transceivers in vehicle ignition-off state. 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: Enables >1-year battery hold-up time without parasitic drain exceeding OEM leakage budgets. | Use Scenario: Supplying FPGA core voltage in portable test equipment with intermittent usage patterns. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller supporting dynamic voltage scaling and rapid wake-up from deep sleep. Use Value: Delivers >92% efficiency at 100mA load (Burst Mode®) and seamless transition to forced CCM at full load. |
| Distributed DC Power Systems | Industrial IoT Edge Nodes |
Use Scenario: Local regulation of 24V backplane to 5V/3.3V for sensor interface modules in factory automation racks. IC Role / Device Role / Timing Role: Intermediate bus converter with programmable frequency (350–535kHz) to avoid sensitive communication band interference. Use Value: Phase-lockable oscillator synchronizes multiple LTC3807IUDC#TRPBF units to eliminate beat frequencies and reduce conducted EMI. | Use Scenario: Powering LoRaWAN node MCU, RF transceiver, and analog front-end from single Li-SOCl₂ cell (3.6V nominal). IC Role / Device Role / Timing Role: Wide-input (4–38V) controller accepting variable input from energy harvesting or backup battery sources. Use Value: 4V UVLO and 14μA shutdown current ensure reliable operation down to end-of-life battery voltage while minimizing self-discharge. |
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 |
|---|---|---|---|
| LTC3892IUF#TRPBF | Dual-channel, 4–60V input, integrated MOSFET drivers only (no power FETs), higher IQ (65μA), supports spread-spectrum modulation. | Suitable for dual-rail systems (e.g., ±12V generation) where channel interleaving reduces input/output ripple. | Choose LTC3892IUF#TRPBF when needing two independent controllers in one package or wider input range beyond 38V. |
| MP2918GL-Z | Single-channel, 4.5–36V input, 500kHz fixed frequency, 45μA IQ, no PLL sync, no EXTVCC option, lower cost. | Targeted at cost-sensitive consumer electronics where phase synchronization and ultra-wide VIN are not required. | Choose MP2918GL-Z when design prioritizes BOM cost over advanced features like Burst Mode® optimization or EXTVCC bias flexibility. |
Compared with LTC3807IUDC#TRPBF, LTC3892IUF#TRPBF adds dual-channel capability and extended input range but increases complexity and quiescent current, while MP2918GL-Z simplifies design and reduces cost but sacrifices light-load efficiency tuning, synchronization, and bias-source flexibility.
Availability
LTC3807IUDC#TRPBF 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 traceable sourcing.
Supply support for LTC3807IUDC#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 power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3807IUDC#TRPBF belongs to Linear's precision current-mode controller family, designed specifically for high-efficiency, low-quiescent-power synchronous buck regulation in battery-critical and wide-input industrial applications.
FAQ
What is the absolute maximum input voltage rating for the LTC3807IUDC#TRPBF?
The LTC3807IUDC#TRPBF has an absolute maximum input supply voltage (VIN) of 40V. Exceeding this rating may cause permanent damage. The recommended operating range remains 4V to 38V, with internal undervoltage lockout engaging below 3.6V (rising) and 3.92V (falling) on INTVCC to prevent erratic startup.
How does the ILIM pin affect current limiting in the LTC3807IUDC#TRPBF?
The ILIM pin on the LTC3807IUDC#TRPBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly sets the peak inductor current trip point without altering the sense resistor value, enabling flexible overcurrent protection configuration across varying output power levels.
Can the LTC3807IUDC#TRPBF operate with only the INTVCC pin powered, without VIN applied?
No, the LTC3807IUDC#TRPBF cannot operate with only INTVCC powered. VIN must be present and within 4V–38V to enable the internal LDO that generates INTVCC (or to allow EXTVCC to take over). INTVCC is an output, not an input - applying voltage solely to INTVCC violates absolute maximum ratings and risks device damage.
What is the purpose of the exposed thermal pad (Pin 21) on the LTC3807IUDC#TRPBF QFN package?
The exposed thermal pad (Pin 21) on the LTC3807IUDC#TRPBF is electrically and thermally connected to SGND. It must be soldered to a PCB copper pour tied to the small-signal ground plane to achieve the specified θJA of 43°C/W and ensure reliable operation at full load. Leaving it unconnected degrades thermal performance and risks junction temperature exceedance.
Does the LTC3807IUDC#TRPBF support output voltage tracking during power-up?
Yes, the LTC3807IUDC#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 LTC3807IUDC#TRPBF regulates its VFB to match the TRACK/SS voltage - enabling coordinated start-up with other rails in multi-voltage systems such as FPGAs or processors with I/O and core domains.
LTC3807IUDC#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC3807IUDC#TRPBF FAQ
1.How can I place an order for LTC3807IUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807IUDC#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 LTC3807IUDC#TRPBF reliable?
The price and inventory of LTC3807IUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807IUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3807IUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807IUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807IUDC#TRPBF?
LTC3807IUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807IUDC#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 LTC3807IUDC#TRPBF?
For technical support, including LTC3807IUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807IUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3807IUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3807IUDC#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 LTC3807IUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3807IUDC#TRPBF?
All LTC3807IUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807IUDC#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 LTC3807IUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3807IUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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