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Analog Devices Inc. LTC3807EUDC#TRPBF
- Part No.:
- LTC3807EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3807EUDC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:19,444
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Product details
Overview
LTC3807EUDC#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 supports 4V–38V input, 0.8V–24V output, 75kHz–750kHz phase-lockable switching frequency, and delivers up to 10A output current in typical 12V/10A converter designs. It is used in battery-powered digital systems requiring ultra-low standby power.
For engineers reviewing the LTC3807EUDC#TRPBF datasheet, LTC3807EUDC#TRPBF pinout, LTC3807EUDC#TRPBF application, or LTC3807EUDC#TRPBF equivalent, key selection criteria include its 50μA no-load IQ, selectable light-load modes (Burst Mode®/pulse-skipping/forced continuous), OPTI-LOOP® compensation, 0.8V precision reference, and 99% duty cycle dropout capability.
Technical Context
The LTC3807EUDC#TRPBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and programmable oscillator (50–900 kHz). Its PLLIN/MODE pin selects among three distinct light-load operating modes-Burst Mode® (50μA IQ), pulse-skipping, or forced continuous conduction-each with defined transient response and ripple trade-offs.
It features dual current sensing options (RSENSE or DCR), adjustable current limit via ILIM pin (three threshold levels: 22/43/64 mV), and integrated protection including output overvoltage detection (±10% VFB trip), power-good monitoring, and current foldback during short-circuit conditions.
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 battery inputs. |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider; enables regulation of core, I/O, or auxiliary rails. |
| No-Load Quiescent Current | 50μA in Burst Mode - extends runtime in always-on battery systems such as IoT sensors or telematics modules. |
| Switching Frequency Range | 75kHz to 750kHz (phase-lockable) - allows EMI optimization and inductor size reduction without sacrificing transient response. |
| Reference Voltage Accuracy | ±1% (0.792V–0.808V) over –40°C to 125°C - ensures tight output regulation across temperature for precision analog or FPGA supplies. |
| Gate Driver Strength | TG/BG pull-up: 2.5Ω/2.4Ω; pull-down: 1.5Ω/1.1Ω - drives high-side and low-side N-MOSFETs with fast rise/fall times (<30 ns) for high-efficiency operation. |
| Soft-Start/Tracking | Internal 10μA TRACK/SS pull-up - enables linear output ramp via external capacitor or precise voltage tracking with external divider. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC), exposed pad (Pin 21) soldered to SGND for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (TRACK/SS) | Soft-start & tracking control | Regulates VFB to smaller of 0.8V or applied voltage; internal 10μA pull-up enables capacitor-based ramp or supply tracking. |
| 2 (FREQ) | Oscillator frequency programming | Resistor-to-GND sets frequency from 50–900 kHz; INTVCC or GND selects fixed 535 kHz or 350 kHz respectively. |
| 3 (PLLIN/MODE) | Light-load mode selection | GND = Burst Mode®; INTVCC = forced continuous; 1.2V–(INTVCC–1.3V) = pulse-skipping - determines efficiency vs. ripple trade-off at light load. |
| 4 (RUN) | Enable/shutdown control | <1.16V disables regulation; <0.7V reduces IQ to 14μA; internal 7μA pull-up allows floating for always-on use. |
| 5 (SENSE–), 6 (SENSE+) | Differential current sense inputs | Measure voltage across RSENSE or DCR network; common-mode range up to 28V supports high-side sensing. |
| 7 (VFB) | Feedback input | Compares output voltage (via resistive divider) to 0.8V reference; ±5 nA bias current minimizes divider error. |
| 8 (ITH) | Error amplifier output & compensation node | Controls peak inductor current; connects to RC network for OPTI-LOOP® compensation across wide COUT/ESR ranges. |
| 9 (PGOOD) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from setpoint; 25μs fault delay prevents false triggering during transients. |
| 10 (TG) | Top gate driver output | Floating high-side driver with swing = INTVCC superimposed on SW node; drives N-MOSFET gate with 2.5Ω pull-up/1.5Ω pull-down. |
| 11 (SW) | Switch node connection | Connects to inductor and source of high-side MOSFET; carries full switching waveform and must be minimized for EMI. |
| 12 (BOOST) | Bootstrap supply for TG | Charged via external diode/capacitor from INTVCC; supports high-side drive up to VIN + INTVCC (max 46V). |
| 13 (BG) | Bottom gate driver output | Ground-referenced driver for synchronous N-MOSFET; 2.4Ω pull-up/1.1Ω pull-down ensures fast turn-on/off. |
| 14 (INTVCC) | Internal LDO output (5.1V) | Powers gate drivers and control circuitry; sourced from VIN or EXTVCC (switchover at 4.7V); requires ≥2.2µF ceramic decoupling to PGND. |
| 15 (EXTVCC) | External bias input for INTVCC LDO | Accepts 0–14V; bypasses VIN LDO when >4.7V - enables high-efficiency self-bias from regulated output rail. |
| 16 (PGND) | Power ground return | Return path for bottom MOSFET source and CIN negative terminal; must be separated from SGND except at single-point star ground. |
| 17 (VIN) | Main input supply | 4V–38V input; requires local ceramic bypass to SGND pins; powers INTVCC LDO when EXTVCC is inactive. |
| 18 (ILIM) | Current limit threshold select | GND/FLOAT/INTVCC selects max sense voltage: 22/43/64 mV - sets current limit without external components. |
| 19 (SGND) | Small-signal ground | Reference for VFB, ITH, TRACK/SS, FREQ, PLLIN/MODE; routed separately from PGND to avoid noise coupling into control loop. |
| 20 (SGND) | Small-signal ground | Duplicate SGND pin for robust grounding of sensitive analog nodes; both SGND pins must connect to same low-impedance plane. |
| 21 (Exposed Pad) | Thermal & electrical ground | Internally connected to SGND; must be soldered to PCB copper area for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 50μA while maintaining regulated output - critical for multi-day battery life in portable instrumentation. |
| OPTI-LOOP® Compensation | Enables stable loop response across diverse output capacitors (ceramic, polymer, electrolytic) and ESR values without redesign. |
| Programmable Light-Load Mode | Selectable Burst Mode®, pulse-skipping, or forced continuous via PLLIN/MODE pin - balances efficiency, ripple, and EMI per system requirement. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation (e.g., 12V→11.8V) - essential for post-regulation in automotive or industrial backup supplies. |
| Three-Level Current Limit | Hardware-selectable sense thresholds (22/43/64 mV) simplify current protection design without trimming resistors or DACs. |
| Integrated Power-Good Monitor | Open-drain PGOOD asserts after soft-start and deasserts if VFB drifts >±10% - provides reliable sequencing signal for downstream logic or microcontrollers. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Always-on telematics control unit (TCU) powered by vehicle battery with cold-cranking down to 4.5V. IC Role / Device Role / Timing Role: Primary buck controller regulating 5V/3.3V rails for MCU, CAN transceiver, and GPS module. Use Value: 50μA Burst Mode® IQ prevents battery drain during weeks of parking; 4V–38V input handles load-dump and cranking transients. | Use Scenario: Portable medical monitor with Li-ion battery (2.7V–4.2V per cell) and 12-hour runtime requirement. IC Role / Device Role / Timing Role: High-efficiency 3.3V/2A supply for ARM Cortex-M7 processor and OLED display backlight driver. Use Value: 0.8V reference accuracy ±1% ensures consistent ADC reference and sensor biasing; OPTI-LOOP® maintains stability with aging polymer capacitors. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
Use Scenario: 24V intermediate bus powering multiple isolated point-of-load converters in factory automation PLC. IC Role / Device Role / Timing Role: Pre-regulator stepping 24V down to 12V for downstream isolated flyback controllers. Use Value: Phase-lockable 750kHz operation synchronizes switching to reduce beat frequencies; 24V max output supports auxiliary 12V/5V rails. | Use Scenario: DIN-rail mounted HMI panel with fanless cooling and -40°C to 85°C ambient rating. IC Role / Device Role / Timing Role: Main 5V/10A supply for ARM-based SoM, Ethernet PHY, and USB hub. Use Value: 125°C junction-rated UDC package ensures reliability at elevated board temperatures; EXTVCC self-bias improves overall system efficiency. |
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 |
|---|---|---|---|
| LT8640S | Integrated power stage (2.5A), 3V–42V input, 2.2MHz fixed frequency, 2.5μA shutdown IQ - monolithic vs. controller topology. | Lower current, higher frequency, no external MOSFETs - suited for space-constrained, lower-power designs where layout simplicity outweighs flexibility. | Select LT8640S when board area is critical and output current ≤2.5A; LTC3807EUDC#TRPBF remains preferred for >5A, thermally demanding, or high-efficiency discrete-FET designs. |
| MP2918 | 4V–36V input, 0.6V reference, 500kHz max frequency, 100μA no-load IQ - lacks phase-lock, Burst Mode®, and OPTI-LOOP®. | Lower cost, simpler feature set - suitable for cost-sensitive industrial supplies where light-load efficiency and advanced compensation are secondary. | Choose MP2918 for budget-driven applications with moderate transient requirements; LTC3807EUDC#TRPBF offers superior light-load IQ, EMI control, and design flexibility. |
Compared with LT8640S and MP2918, the LTC3807EUDC#TRPBF provides the lowest quiescent current (50μA), widest input/output range, and most flexible light-load mode selection - making it optimal for high-reliability, battery-sensitive, or thermally constrained synchronous buck designs requiring discrete MOSFET optimization.
Availability
LTC3807EUDC#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, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3807EUDC#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3807EUDC#TRPBF belongs to Linear's high-performance DC/DC controller family, designed specifically for efficiency-critical, wide-input-voltage applications in automotive, industrial, and portable electronics where low IQ, robust protection, and flexible configuration are mandatory.
FAQ
What is the maximum output voltage supported by the LTC3807EUDC#TRPBF?
The LTC3807EUDC#TRPBF supports an output voltage range of 0.8V to 24V, set by an external resistor divider on the VFB pin. The upper limit of 24V is specified in the datasheet under "Wide Output Voltage Range" and confirmed in the Electrical Characteristics table (VOUT = 0.8V to 24V). This enables direct regulation of 12V, 15V, or 24V auxiliary rails without post-regulation stages.
Does the LTC3807EUDC#TRPBF support synchronization to an external clock?
Yes, the LTC3807EUDC#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop locks the rising edge of the TG signal to the rising edge of the external clock. The device operates in forced continuous mode during synchronization, and the valid input frequency range is 75kHz to 750kHz as specified in the Absolute Maximum Ratings and Electrical Characteristics tables.
How does the ILIM pin affect current limiting in the LTC3807EUDC#TRPBF?
The ILIM pin on the LTC3807EUDC#TRPBF selects one of three maximum current sense thresholds: 22 mV (ILIM = GND), 43 mV (ILIM = FLOAT), or 64 mV (ILIM = INTVCC). These thresholds directly set the peak inductor current limit based on the sense resistor or DCR network. The selected value appears in the Electrical Characteristics table under "VSENSE(MAX)" with corresponding min/typ/max values across temperature.
What is the purpose of the EXTVCC pin on the LTC3807EUDC#TRPBF?
The EXTVCC pin on the LTC3807EUDC#TRPBF provides an alternative input to the internal LDO that powers INTVCC. When EXTVCC exceeds 4.7V (with 250mV hysteresis), the device switches from the VIN-based LDO to the EXTVCC-based LDO, improving system efficiency by avoiding linear regulation losses. This allows self-biasing from the output rail or another clean supply, and is explicitly detailed in the "INTVCC/EXTVCC Power" section of the datasheet.
Can the LTC3807EUDC#TRPBF operate in dropout mode, and what is its minimum on-time?
Yes, the LTC3807EUDC#TRPBF supports very low dropout operation with up to 99% duty cycle. Its minimum on-time is specified as 95 ns under typical conditions (inductor ripple ≥40% of IMAX). This enables regulation even when input and output voltages are closely spaced (e.g., 12.1V → 12V), and the dropout behavior is managed by an internal detector that periodically forces top-FET off to recharge the bootstrap capacitor.
LTC3807EUDC#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)
LTC3807EUDC#TRPBF FAQ
1.How can I place an order for LTC3807EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807EUDC#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 LTC3807EUDC#TRPBF reliable?
The price and inventory of LTC3807EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3807EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807EUDC#TRPBF?
LTC3807EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807EUDC#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 LTC3807EUDC#TRPBF?
For technical support, including LTC3807EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807EUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3807EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3807EUDC#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 LTC3807EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3807EUDC#TRPBF?
All LTC3807EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807EUDC#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 LTC3807EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3807EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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