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Analog Devices Inc. LTC3807EFE#TRPBF
- Part No.:
- LTC3807EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3807EFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,592
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Product details
Overview
LTC3807EFE#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, 50μA no-load quiescent current, and phase-lockable switching up to 750kHz - enabling high-efficiency power conversion in battery-powered digital systems and automotive always-on applications.
For engineers reviewing the LTC3807EFE#TRPBF datasheet, LTC3807EFE#TRPBF pinout, LTC3807EFE#TRPBF application, or LTC3807EFE#TRPBF equivalent, key selection considerations include its selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, precision 0.8V reference, and dual-package availability in 20-pin TSSOP with –40°C to 125°C operation.
Technical Context
The LTC3807EFE#TRPBF implements a current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho), programmable oscillator (50kHz–900kHz), and PLL synchronization capability (75kHz–750kHz). Its ITH pin serves as both error amplifier output and current limit threshold control point, directly modulating peak inductor current via sensed voltage across RSENSE or DCR.
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, 99% maximum duty cycle for ultra-low dropout, and independent EXTVCC LDO switchover (4.7V threshold) to support efficient self-biasing from regulated output rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports wide intermediate bus and battery chemistries including 12V/24V automotive and Li-ion stacks. |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider; enables single-controller flexibility across multiple rail requirements. |
| No-Load Quiescent Current | 50μA - extends runtime in battery-powered systems by minimizing standby power loss. |
| Switching Frequency Range | 50kHz to 900kHz (programmable) or 75kHz to 750kHz (PLL-synchronized) - balances efficiency, size, and EMI in compact designs. |
| Reference Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable regulation across industrial temperature range without external trimming. |
| Gate Driver Strength | TG: 2.5Ω pull-up / 1.5Ω pull-down; BG: 2.4Ω / 1.1Ω - drives large N-channel MOSFETs with fast rise/fall times (≤25ns) and low shoot-through risk. |
| Light-Load Operation Modes | Burst Mode®, pulse-skipping, or forced continuous - selected via PLLIN/MODE pin; optimizes efficiency across load range without sacrificing transient response. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package), exposed pad (Pin 21) connected to SGND for thermal performance; rated θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (Pin 1) | Soft-start & tracking control input | Internal 10µA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider to track another supply during startup. |
| FREQ (Pin 2) | Oscillator frequency programming | 20µA internal pull-up sets VCO voltage; GND = 350kHz, INTVCC = 535kHz, resistor-to-GND enables precise frequency tuning (50–900kHz). |
| PLLIN/MODE (Pin 3) | Light-load mode selection & sync input | GND = Burst Mode®, INTVCC = forced continuous, 1.2V–(INTVCC–1.3V) = pulse-skipping; external clock input enables phase-locking. |
| RUN (Pin 6) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down entire IC (IQ = 14µA); internal 7µA pull-up allows floating for always-on use. |
| SENSE– / SENSE+ (Pins 7, 8) | Differential current sense inputs | Measure voltage across RSENSE or DCR; SENSE– powers comparator when > INTVCC – 0.5V; supports selectable current limit via ILIM pin. |
| VFB (Pin 9) | Feedback input | Compares output voltage (via resistive divider) to 0.8V internal reference; ±1% accuracy over full temp range ensures tight regulation. |
| ITH (Pin 10) | Error amplifier output & current limit control | Directly sets peak inductor current threshold; also used for OPTI-LOOP® compensation network connection. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; includes 25µs fault delay and 2.5% hysteresis for noise immunity. |
| TG (Pin 12) | Top N-MOSFET gate driver | Floating driver with swing = INTVCC superimposed on SW node; supports bootstrap operation and dropout recovery via periodic CB recharge. |
| SW (Pin 13) | Switch node connection | Connects to inductor and bootstrap capacitor; voltage swings from 0V to VIN; critical for layout to minimize ringing and EMI. |
| BOOST (Pin 14) | Bootstrap supply | Capacitor between BOOST and SW provides gate drive voltage for TG; Schottky diode to INTVCC maintains charge during low-duty cycles. |
| BG (Pin 15) | Bottom N-MOSFET gate driver | Ground-referenced driver (0V to INTVCC); complements TG for synchronous rectification and high efficiency at light loads. |
| INTVCC (Pin 16) | Internal LDO output | 5.1V ±3% regulated supply for logic and drivers; decoupled with ≥2.2µF ceramic to PGND; powered from VIN or EXTVCC (switchover at 4.7V). |
| EXTVCC (Pin 17) | External bias input | Enables higher-efficiency biasing from regulated output rail; must be ≤14V; tied to SGND if unused. |
| PGND (Pin 18) | Power ground | Return path for bottom MOSFET source and CIN (–) terminal; separate from SGND to avoid noise coupling into sensitive analog circuitry. |
| VIN (Pin 19) | Main input supply | Accepts 4V–38V; requires local ceramic bypass to SGND; absolute max = 40V. |
| ILIM (Pin 20) | Current limit range select | GND/INTVCC/FLOAT selects max sense threshold: 22/43/64mV - adjusts current limit without changing RSENSE. |
| SGND (Pins 2, 4, 5, 21) | Small-signal ground | Mandatory star-point connection for VFB, ITH, TRACK/SS, FREQ, PLLIN/MODE; exposed pad (Pin 21) must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitance (e.g., 22µF–150µF) and ESR (1mΩ–100mΩ), eliminating need for re-tuning per design. |
| Selectably Programmable Light-Load Mode | Three distinct operating modes (Burst Mode®, pulse-skipping, forced continuous) enable optimization of efficiency vs. output ripple vs. transient response without hardware change. |
| 99% Maximum Duty Cycle | Supports ultra-low dropout operation (e.g., 12V→11.8V at high load), critical for maintaining regulation in brownout or battery-depleted conditions. |
| Integrated EXTVCC Switchover LDO | Automatically switches INTVCC sourcing from VIN to external rail when EXTVCC exceeds 4.7V, reducing power loss and improving system efficiency. |
| Current Foldback Protection | Reduces MOSFET stress during short-circuit by lowering peak current limit - prevents thermal runaway while maintaining controllability. |
| Power-Good Output with Hysteresis | PGOOD asserts only after VFB stabilizes within ±10% and holds for ≥25µs; 2.5% hysteresis prevents chatter near trip point under noisy conditions. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment, telematics, and ADAS modules that remain active during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary step-down controller regulating 12V battery to 3.3V/5V/8.5V rails with ultra-low IQ (50μA) and robust cold-crank tolerance (4V start). Use Value: Extends battery life over weeks of parking; withstands 40V load-dump transients via 40V abs-max VIN rating and integrated OVP. |
Use Scenario: Power management in portable test equipment, handheld medical monitors, and IoT edge nodes. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering 10A at 3.3V from single-cell Li-ion (3.0–4.2V) or two-cell pack (6–8.4V). Use Value: Burst Mode® delivers >85% efficiency at 1mA load; soft-start prevents inrush into capacitive loads; TRACK/SS enables sequenced multi-rail startup. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
Use Scenario: Intermediate bus converter in 24V/48V distributed architectures powering FPGA, DSP, and memory subsystems. IC Role / Device Role / Timing Role: Wide-input (4–38V), wide-output (0.8–24V) controller supporting dynamic voltage scaling and remote sensing. Use Value: Phase-lockable frequency avoids beat frequencies in multi-converter systems; RSENSE/DCR sensing accommodates diverse inductor choices. |
Use Scenario: Main power supply for PLC I/O modules, motor drives, and factory automation controllers requiring long-term reliability. IC Role / Device Role / Timing Role: Industrial-grade controller (–40°C to 125°C) with 150°C junction max, EXTVCC biasing, and robust UVLO hysteresis (50mV). Use Value: Guaranteed operation across extended temperature range; shutdown IQ = 14μA enables safe firmware-controlled power cycling. |
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 |
|---|---|---|---|
| LTC3892EFE#TRPBF | Dual-channel, 4–60V input, 55μA IQ, integrated MOSFET drivers with higher current capability (TG: 1.5Ω, BG: 0.9Ω), but larger 32-pin QFN package. | Required for dual-output or higher-current (>15A) designs; not drop-in compatible due to pin count, routing, and control logic differences. | Choose LTC3892EFE#TRPBF when needing dual outputs or higher drive strength; LTC3807EFE#TRPBF remains optimal for cost-sensitive, space-constrained single-channel designs. |
| MP2918GL-Z | Monolithic synchronous buck controller (integrated MOSFETs), 4.5–36V input, 100μA IQ, fixed 500kHz frequency, no PLL or Burst Mode®. | Suitable for lower-power (<6A), simpler designs where board space and BOM count outweigh flexibility; lacks programmable frequency and advanced light-load modes. | Choose MP2918GL-Z for simplified layout and reduced component count in non-critical efficiency applications; LTC3807EFE#TRPBF offers superior efficiency control and thermal headroom. |
Compared with LTC3892EFE#TRPBF and MP2918GL-Z, the LTC3807EFE#TRPBF uniquely balances ultra-low IQ, wide input/output range, flexible light-load operation, and compact TSSOP packaging - making it ideal for single-rail, battery-sensitive, and thermally constrained industrial and automotive applications.
Availability
LTC3807EFE#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-lifecycle support, and guaranteed industrial temperature operation.
Supply support for LTC3807EFE#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, inheriting its legacy of high-performance analog and power management ICs with rigorous industrial and automotive qualification.
The LTC3807EFE#TRPBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding DC/DC conversion in battery-backed, automotive, and industrial environments where low IQ, wide VIN/VOUT range, and robust protection are mandatory.
FAQ
What is the operating temperature range for the LTC3807EFE#TRPBF?
The LTC3807EFE#TRPBF is specified for operation from –40°C to +125°C ambient temperature, with a maximum junction temperature of 125°C. Its thermal resistance (θJA) is 38°C/W in the 20-lead TSSOP package, enabling reliable performance in automotive and industrial environments when properly heatsinked via the exposed pad.
How does the LTC3807EFE#TRPBF achieve ultra-low quiescent current?
The LTC3807EFE#TRPBF achieves 50μA no-load IQ through adaptive circuitry that disables non-essential blocks in Burst Mode® operation - including the oscillator, gate drivers, and portions of the error amplifier - while retaining core regulation capability. In shutdown (RUN < 0.7V), IQ drops further to 14μA via complete internal LDO disablement.
Can the LTC3807EFE#TRPBF be synchronized to an external clock?
Yes - the LTC3807EFE#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal (75kHz–750kHz) is applied, its internal phase-locked loop aligns the rising edge of the TG signal to the external clock's rising edge, eliminating beat frequencies in multi-regulator systems and simplifying EMI filtering.
What is the purpose of the EXTVCC pin on the LTC3807EFE#TRPBF?
The EXTVCC pin on the LTC3807EFE#TRPBF allows the internal INTVCC LDO to be powered from an external regulated supply (e.g., the LTC3807EFE#TRPBF's own output rail) instead of VIN. When EXTVCC exceeds 4.7V, the device automatically switches biasing, reducing power loss and improving overall system efficiency - especially in high-VIN, low-VOUT configurations.
Does the LTC3807EFE#TRPBF support current sensing using DCR?
Yes - the LTC3807EFE#TRPBF supports both RSENSE and DCR current sensing. Its SENSE+ and SENSE– inputs accept differential voltage signals from either a discrete shunt resistor or the voltage drop across an inductor's DCR, with optional RC filter networks to compensate for DCR temperature drift and improve noise immunity.
LTC3807EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3807EFE#TRPBF FAQ
1.How can I place an order for LTC3807EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807EFE#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 LTC3807EFE#TRPBF reliable?
The price and inventory of LTC3807EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3807EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807EFE#TRPBF?
LTC3807EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807EFE#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 LTC3807EFE#TRPBF?
For technical support, including LTC3807EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3807EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3807EFE#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 LTC3807EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3807EFE#TRPBF?
All LTC3807EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807EFE#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 LTC3807EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3807EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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