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Analog Devices Inc. LTC3807IFE#TRPBF
- Part No.:
- LTC3807IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3807IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,422
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Product details
Overview
LTC3807IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance synchronous step-down DC/DC controller driving all-N-channel MOSFETs, featuring 4V–38V input range, 0.8V–24V programmable output, and 50μA no-load quiescent current - enabling long battery runtime in always-on automotive and portable systems.
For engineers reviewing the LTC3807IFE#TRPBF datasheet, LTC3807IFE#TRPBF pinout, LTC3807IFE#TRPBF application, or LTC3807IFE#TRPBF equivalent, key selection criteria include light-load efficiency mode selection (Burst/Pulse-Skip/Forced CCM), phase-lockable 75kHz–750kHz switching frequency, RSENSE/DCR current sensing, and 99% duty cycle dropout capability.
Technical Context
The LTC3807IFE#TRPBF implements constant-frequency current-mode control with an internal transconductance error amplifier (gm = 2 mmho) and OPTI-LOOP® compensation, supporting wide output capacitance and ESR ranges. Its dual LDO architecture powers internal circuitry from either VIN (via INTVCC) or an external 4.7V–14V source (via EXTVCC), with automatic switchover at ~4.7V.
Light-load behavior is configurable via PLLIN/MODE pin: ground for Burst Mode (50μA IQ), INTVCC for forced continuous conduction, or mid-voltage for pulse-skipping. Current foldback limits MOSFET dissipation during short circuits, while no-foldback operation is maintained during start-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - supports 12V/24V/36V intermediate bus rails and multi-cell Li-ion, lead-acid, and automotive battery chemistries. |
| Output Voltage Range | 0.8V to 24V - set by external resistor divider; precision 0.800V ±1.2mV reference enables accurate regulation across temperature. |
| No-Load Quiescent Current | 50μA in Burst Mode - extends battery life in standby or low-duty-cycle IoT and telematics applications. |
| Switching Frequency Range | 75kHz to 750kHz (PLL-sync capable); fixed options 350kHz/535kHz - balances size, efficiency, and EMI in space-constrained designs. |
| Max Duty Cycle | 99% - enables ultra-low dropout operation (e.g., 24VIN → 23.76VOUT) without requiring external bias supply. |
| Current Sense Threshold | 22mV to 85mV (selectable via ILIM pin) - accommodates low-value sense resistors or DCR sensing for high-current, high-efficiency converters. |
| Power Good Accuracy | ±10% VFB trip with 2.5% hysteresis - provides reliable system power sequencing and fault detection. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package), exposed pad (Pin 21) soldered to SGND for thermal performance; 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. |
| FREQ (Pin 2) | Oscillator frequency programming | 20µA internal pull-up sets VCO voltage; GND = 350kHz, INTVCC = 535kHz, resistor-to-GND enables 50–900kHz tuning. |
| PLLIN/MODE (Pin 3) | Light-load mode & sync input | GND = Burst Mode; INTVCC = Forced CCM; 1.2V–(INTVCC−1.3V) = Pulse-Skipping; external clock = PLL sync. |
| RUN (Pin 6) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down entire IC (IQ = 14µA); internal 7µA pull-up enables floating use. |
| SENSE– / SENSE+ (Pins 7, 8) | Differential current sense inputs | Support RSENSE or DCR sensing; common-mode range up to 28V; bias current < ±2µA minimizes sensing error. |
| VFB (Pin 9) | Feedback voltage input | Compares output divider voltage to 0.800V reference; ±5nA input current ensures minimal divider loading. |
| ITH (Pin 10) | Error amplifier output & compensation node | Directly controls peak inductor current; connects to RC network for OPTI-LOOP® compensation across wide COUT/ESR range. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from target; 2mA sink capability drives logic or microcontroller interrupt. |
| TG (Pin 12) | Top N-MOSFET gate driver output | Floating driver with 2.5Ω pull-up/pull-down; 25ns rise/fall into 3300pF - supports fast-switching GaN or SiC top FETs. |
| SW (Pin 13) | Switch node connection | Connects to inductor and bootstrap capacitor; rated –5V to 40V - handles high dV/dt ringing in high-frequency designs. |
| BOOST (Pin 14) | Bootstrap supply for TG driver | Swings from INTVCC to (VIN + INTVCC); requires Schottky diode and ceramic cap between BOOST and SW. |
| BG (Pin 15) | Bottom N-MOSFET gate driver output | Ground-referenced driver with 2.4Ω pull-up/1.1Ω pull-down; 25ns rise/13ns fall into 3300pF - optimized for low-loss synchronous rectification. |
| INTVCC (Pin 16) | Internal LDO output (5.1V) | Powers drivers and analog circuitry; requires ≥2.2µF ceramic decoupling to PGND; load-regulated to ±1.1%. |
| EXTVCC (Pin 17) | External bias input for INTVCC LDO | Enables high-efficiency bypass of VIN LDO when >4.7V applied; switchover hysteresis = 250mV. |
| PGND (Pin 18) | Power ground return | Connects to bottom FET source and CIN(–); must be separate from SGND except at single-point star ground. |
| VIN (Pin 19) | Main input supply | 4V–38V operating range; requires local ceramic bypass to SGND; absolute max = 40V. |
| ILIM (Pin 20) | Current limit threshold select | GND = 22mV, FLOAT = 43mV, INTVCC = 64mV - configures sense voltage for 3 discrete current-limit levels. |
| SGND (Pins 2, 4, 5, 21) | Small-signal ground | Mandatory separate routing from PGND; pins 2/4/5 and exposed pad (21) must all connect to same low-noise SGND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces no-load IQ to 50μA while maintaining tight output regulation - critical for automotive always-on modules with strict leakage budgets. |
| OPTI-LOOP® Compensation | Enables stable loop response across 10× variation in output capacitance and ESR - eliminates re-tuning when changing bulk capacitors or using polymer/MLCC hybrids. |
| Programmable Light-Load Modes | Selectable Burst, Pulse-Skipping, or Forced CCM via single PLLIN/MODE pin - allows optimization of efficiency vs. output ripple for each application load profile. |
| 99% Maximum Duty Cycle | Supports near-dropout conversion (e.g., 12V→11.88V) without external VBST supply - simplifies layout and reduces BOM count in high-VIN/high-VOUT designs. |
| Three-Level Current Limit | ILIM pin selects 22mV/43mV/64mV sense thresholds - enables precise current limiting across diverse MOSFET RDS(on) and inductor DCR values. |
| Robust Protection Suite | Includes output overvoltage protection (OVP), power-good monitoring, undervoltage lockout (UVLO), and current foldback - reduces need for external supervision ICs. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: 24V vehicle battery powers 5V/3.3V rails for display controllers and CAN transceivers in head units. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 5V rail from 12V–36V unregulated bus; operates in Burst Mode during display-off state. Use Value: 50μA quiescent current prevents battery drain during weeks-long parking; 40V abs-max rating withstands load-dump transients. |
Use Scenario: Distributed 24V DC power system supplies isolated 12V/5V rails to analog input/output channels in factory automation controllers. IC Role / Device Role / Timing Role: High-efficiency step-down controller delivering 10A at 12V; uses DCR current sensing to eliminate sense resistor losses. Use Value: 99% duty cycle enables 12V output from 12.5V minimum input; phase-lock capability synchronizes multiple rails to reduce beat-frequency EMI. |
| Portable Medical Diagnostic Device | Telecom Remote Radio Unit (RRU) |
Use Scenario: Battery-powered ultrasound scanner requires clean, low-noise 3.3V and 1.8V rails for ADCs and FPGAs during intermittent imaging bursts. IC Role / Device Role / Timing Role: Dual-phase controller (with external sync) generating 3.3V; TRACK/SS pin coordinates soft-start with FPGA configuration sequence. Use Value: Programmable 350kHz/535kHz switching avoids sensitive RF bands; PGOOD signal triggers FPGA initialization upon rail stability. |
Use Scenario: Outdoor macrocell RRU converts -48V telecom bus to 12V/5V for power amplifiers and baseband processors under wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability buck controller operating from –40°C to 125°C junction; EXTVCC powered from intermediate 12V rail improves overall system efficiency. Use Value: Internal LDO switchover reduces heat generation; 150°C-rated H-grade variants available for extended thermal margin. |
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 4A power stage; 3.4V–42V input; 2.2MHz fixed frequency; 2.5μA shutdown IQ | Lower current, higher frequency, monolithic solution - suited for compact, medium-power point-of-load designs where board space is constrained. | Choose LT8640S when integrating power stage saves layout complexity and thermal management is manageable; not drop-in due to different pinout and integrated FETs. |
| MP2918 | 4V–60V input; 0.6V reference; 100μA no-load IQ; no PLL sync; smaller 16-pin QFN | Higher input voltage range but lacks phase-lock capability and OPTI-LOOP®; lower light-load efficiency than LTC3807IFE#TRPBF. | Choose MP2918 for cost-sensitive industrial supplies where 60V input tolerance is required and synchronization is unnecessary. |
Compared with LT8640S and MP2918, the LTC3807IFE#TRPBF delivers superior light-load efficiency (50μA vs. ≥100μA), flexible frequency synchronization, and robust compensation for high-output-capacitance loads - making it optimal for automotive and high-reliability distributed power systems.
Availability
LTC3807IFE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power modules, and portable medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3807IFE#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 emphasis on precision, reliability, and ruggedness.
The LTC3807IFE#TRPBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding automotive, industrial, and telecom applications requiring wide input range, ultra-low quiescent current, and robust protection features.
FAQ
What is the maximum input voltage rating for the LTC3807IFE#TRPBF?
The LTC3807IFE#TRPBF has an absolute maximum input voltage rating of 40V on the VIN pin. Its operational input range is specified from 4V to 38V, making it suitable for 24V and 36V industrial and automotive bus systems. Exceeding 40V may cause permanent damage per Absolute Maximum Ratings.
How does the LTC3807IFE#TRPBF achieve 50μA quiescent current?
The LTC3807IFE#TRPBF achieves 50μA no-load quiescent current in Burst Mode operation by disabling most internal circuitry-including the gate drivers and oscillator-when the ITH voltage drops below 0.425V. The error amplifier output is parked at 0.450V, and only essential bias currents remain active, minimizing power draw during light or no-load conditions.
Can the LTC3807IFE#TRPBF synchronize to an external clock?
Yes, the LTC3807IFE#TRPBF can synchronize to an external clock via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of the TG signal to the rising edge of the external clock, enabling precise timing coordination across multiple converters to suppress beat-frequency EMI.
What package type is used for the LTC3807IFE#TRPBF?
The LTC3807IFE#TRPBF uses a 20-lead plastic TSSOP package (FE package) with an exposed thermal pad (Pin 21) that must be soldered to SGND for proper thermal performance. Its thermal resistance is θJA = 38°C/W, and it operates over –40°C to +125°C junction temperature.
Does the LTC3807IFE#TRPBF support both RSENSE and DCR current sensing?
Yes, the LTC3807IFE#TRPBF supports both RSENSE and DCR current sensing through its differential SENSE+ and SENSE– inputs. The input bias current is less than ±2µA, and the common-mode voltage range extends to 28V, enabling accurate sensing across a wide range of inductor DCR values or discrete sense resistors.
LTC3807IFE#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
LTC3807IFE#TRPBF FAQ
1.How can I place an order for LTC3807IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807IFE#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 LTC3807IFE#TRPBF reliable?
The price and inventory of LTC3807IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3807IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807IFE#TRPBF?
LTC3807IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807IFE#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 LTC3807IFE#TRPBF?
For technical support, including LTC3807IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3807IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3807IFE#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 LTC3807IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3807IFE#TRPBF?
All LTC3807IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807IFE#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 LTC3807IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3807IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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