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Analog Devices Inc. LTC3807HFE#TRPBF
- Part No.:
- LTC3807HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3807HFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,654
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Product details
Overview
LTC3807HFE#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 operates from 4V to 38V input, delivers 0.8V–24V output, supports phase-lockable switching up to 750kHz, and features 50μA no-load IQ - optimized for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC3807HFE#TRPBF datasheet, LTC3807HFE#TRPBF pinout, LTC3807HFE#TRPBF application, or LTC3807HFE#TRPBF equivalent, key selection criteria include its 99% duty cycle dropout capability, selectable light-load modes (Burst Mode®/pulse-skipping/forced continuous), RSENSE or DCR current sensing, OPTI-LOOP® compensation, and 0.8V ±1.2mV reference accuracy over –40°C to 150°C junction temperature.
Technical Context
The LTC3807HFE#TRPBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and precision 0.8V reference. Its PLLIN/MODE pin selects among Burst Mode®, pulse-skipping, or forced continuous conduction at light loads - enabling efficiency optimization across load ranges without external circuit changes.
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, supports external EXTVCC switchover (4.7V threshold), and includes built-in output overvoltage protection (±10% VFB trip), power-good monitoring, and adjustable soft-start/tracking via the TRACK/SS pin with 10µA internal current source.
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 systems. |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider; 0.8V ±1.2mV reference ensures tight regulation. |
| No-Load Quiescent Current | 50µA - extends runtime in battery-powered applications; drops to 14µA in shutdown. |
| Switching Frequency Range | 75kHz to 750kHz - phase-lockable to external clock or programmable via FREQ pin resistor (50–900kHz). |
| Max Duty Cycle | 99% - enables ultra-low dropout operation when VIN approaches VOUT, critical for high-efficiency point-of-load designs. |
| Current Sense Threshold | 22mV to 85mV - selectable via ILIM pin (GND/FLOAT/INTVCC) to match RSENSE or DCR sensing networks. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive and industrial high-temp environments. |
Pinout & Package
Package: 20-lead plastic TSSOP (FE package), exposed pad (Pin 21) connected 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 current source ramps voltage; regulates VFB to min(0.8V, TRACK/SS) - enables controlled startup or supply tracking. |
| FREQ (Pin 2) | Oscillator frequency programming | 20µA internal pull-up; resistor to GND sets VCO frequency from 50kHz to 900kHz - enables precise loop bandwidth tuning. |
| PLLIN/MODE (Pin 3) | Light-load mode & sync input | Selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC); also accepts external clock for synchronization. |
| RUN (Pin 6) | Enable/shutdown control | 1.16V rising threshold disables control loop; 0.7V rising threshold shuts down entire IC - enables UVLO or logic-controlled enable. |
| SENSE– / SENSE+ (Pins 7/8) | Differential current sense inputs | Supports RSENSE or DCR sensing; common-mode range up to 28V - allows high-side or low-side current measurement. |
| VFB (Pin 9) | Feedback input | Compares output voltage (via resistive divider) to 0.8V reference; ±10% PGOOD window ensures reliable rail monitoring. |
| ITH (Pin 10) | Error amplifier output & compensation node | Directly controls peak inductor current; connects to external RC network for OPTI-LOOP® compensation - stabilizes loop over wide ESR/capacitance ranges. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from setpoint - provides system-level fault signaling without external logic. |
| TG (Pin 12) | Top N-MOSFET gate driver | Floating driver with 2.5Ω pull-up / 1.5Ω pull-down; supports bootstrap operation up to 46V BOOST swing - enables high-side switch control. |
| SW (Pin 13) | Switch node connection | Connects to inductor and MOSFET source/drain nodes - high dv/dt node requiring careful layout and Kelvin sensing. |
| BOOST (Pin 14) | Bootstrap supply for TG driver | Charged via external capacitor between BOOST and SW; diode from INTVCC prevents reverse discharge - sustains top-FET drive during 100% duty cycle. |
| BG (Pin 15) | Bottom N-MOSFET gate driver | Ground-referenced driver with 2.4Ω pull-up / 1.1Ω pull-down - drives synchronous rectifier with fast rise/fall times (25ns/13ns). |
| INTVCC (Pin 16) | Internal LDO output (5.1V) | Powers gate drivers and analog circuits; sourced from VIN or EXTVCC (switchover at 4.7V) - improves efficiency when powered from regulated output. |
| EXTVCC (Pin 17) | External bias input for INTVCC LDO | Accepts 0–14V; bypasses VIN LDO when >4.7V - reduces power loss and heat in high-input-voltage applications. |
| PGND (Pin 18) | Power ground return | Connects to bottom MOSFET source and CIN (–) - must be separated from SGND to avoid noise coupling into sensitive analog circuitry. |
| VIN (Pin 19) | Main input supply | 4V–38V operating range; requires local ceramic decoupling to SGND - powers internal VIN LDO and supplies energy to switching stage. |
| ILIM (Pin 20) | Current limit threshold select | GND/FLOAT/INTVCC selection sets max sense voltage to 22mV/43mV/64mV - matches different RSENSE values or DCR coefficients. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Enables 50µA quiescent current at light loads while maintaining tight output regulation - ideal for always-on automotive ECUs. |
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (22µF–1000µF) and ESR ranges without redesign - reduces qualification effort. |
| 99% Maximum Duty Cycle | Supports VIN-to-VOUT ratios as low as 1.01:1 - eliminates need for pre-regulators in 12V→12V or 24V→24V hold-up applications. |
| Programmable Light-Load Mode | Three distinct low-power behaviors (Burst/Pulse-Skip/Forced Continuous) selected via single pin - balances efficiency vs. output ripple per system requirement. |
| Integrated EXTVCC Switchover | Automatically switches INTVCC sourcing from VIN to external supply above 4.7V - improves overall converter efficiency by >2% at high input voltages. |
| Robust Thermal Rating | Rated for –40°C to +150°C junction temperature - qualified for under-hood placement without derating in automotive Grade H applications. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in vehicle body electronics with 12V battery input and strict low-power requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 3.3V/5V rails; manages startup sequencing via TRACK/SS and monitors rail integrity via PGOOD. Use Value: 50µA no-load IQ extends sleep-mode battery life; 150°C rating enables direct mounting near engine bay electronics without heatsinks. |
Use Scenario: Generating isolated 12V and 5V auxiliary rails from 24V industrial DC bus in programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs; uses EXTVCC to derive INTVCC from its own 12V output, reducing total power loss. Use Value: 99% duty cycle supports brownout operation during 24V bus dips; selectable light-load mode minimizes standby loss in unattended factory automation systems. |
| Portable Medical Diagnostic Device | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Powering FPGA, ADCs, and wireless modules in handheld ultrasound or glucose monitors using Li-ion battery input (3.0–4.2V nominal, up to 38V with boost stages). IC Role / Device Role / Timing Role: Core power controller managing multiple output rails; employs soft-start via TRACK/SS to prevent inrush current during battery insertion. Use Value: Wide 4V–38V input accommodates battery + backup capacitor configurations; 0.8V reference enables precise low-voltage rail generation for modern low-power SoCs. |
Use Scenario: Providing 8.5V and 3.3V rails for RF amplifiers and baseband processors in outdoor 5G remote radio units powered from 48V telecom DC plant. IC Role / Device Role / Timing Role: High-reliability buck controller operating in forced continuous mode to suppress EMI; uses PLLIN/MODE to synchronize switching to system clock. Use Value: Phase-lockable 750kHz operation enables deterministic EMI filtering; –40°C to +150°C rating ensures operation in sealed, passively cooled enclosures exposed to desert/sunlight conditions. |
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 |
|---|---|---|---|
| LTC3891HDE#TRPBF | Dual-channel controller with integrated 5V/100mA bias LDO; higher IQ (75µA) but adds channel redundancy and independent mode control. | Suitable for multi-rail systems requiring independent sequencing and fault isolation - not drop-in for single-output designs. | Select when needing dual outputs or integrated bias supply; requires PCB layout revision due to different pinout and package (24-lead 4mm × 4mm QFN). |
| MP2918GL-Z | Single-channel controller with 45µA IQ, 4.5–60V input, but lacks PLL synchronization, EXTVCC switchover, and OPTI-LOOP® - uses standard Type II compensation. | Better suited for cost-sensitive industrial SMPS where phase-locking and ultra-low IQ are non-critical. | Choose for simpler designs with wider input range (up to 60V); verify stability with external compensation network - no direct pin compatibility. |
Compared with LTC3891HDE#TRPBF and MP2918GL-Z, the LTC3807HFE#TRPBF offers superior light-load efficiency via Burst Mode®, tighter reference accuracy (±1.2mV vs ±2%), and proven thermal robustness for automotive H-grade use - making it optimal for single-rail, high-reliability, low-IQ applications where layout space and thermal margin are constrained.
Availability
LTC3807HFE#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power supplies, portable medical diagnostics, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3807HFE#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 LTC3807 belongs to Linear's high-performance DC/DC controller family, designed specifically for demanding automotive, industrial, and battery-powered applications requiring ultra-low quiescent current, wide input range, and robust thermal operation.
FAQ
What is the maximum junction temperature rating for the LTC3807HFE#TRPBF?
The LTC3807HFE#TRPBF is rated for operation from –40°C to +150°C junction temperature, qualifying it for automotive Grade H applications and high-ambient industrial environments. This rating is verified per manufacturer specifications and supported by thermal characterization data showing θJA = 38°C/W for the TSSOP package.
Does the LTC3807HFE#TRPBF support synchronization to an external clock?
Yes, the LTC3807HFE#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of the TG gate drive to the rising edge of the input clock - enabling deterministic EMI reduction and multi-phase interleaving in complex power systems.
How does the EXTVCC feature improve efficiency in the LTC3807HFE#TRPBF?
The EXTVCC feature in the LTC3807HFE#TRPBF allows the internal INTVCC LDO to be powered from an external regulated supply (e.g., the converter's own output) instead of VIN when EXTVCC exceeds 4.7V. This bypasses the VIN LDO's dropout loss, improving overall efficiency by up to 2.5% in high-input-voltage applications such as 48V telecom systems.
Can the LTC3807HFE#TRPBF operate in dropout mode, and what is its minimum on-time?
Yes, the LTC3807HFE#TRPBF supports dropout operation with up to 99% duty cycle. Its minimum on-time is 95ns, enabling stable regulation even when VIN is only slightly above VOUT - critical for applications like 12V input to 12V output with hold-up capacitors or automotive cold-crank scenarios.
What current sensing methods are supported by the LTC3807HFE#TRPBF?
The LTC3807HFE#TRPBF supports both RSENSE (shunt resistor) and DCR (inductor winding resistance) current sensing via its differential SENSE+ and SENSE– inputs. The ILIM pin selects one of three current sense thresholds (22mV/43mV/64mV), allowing optimization for different shunt values or DCR coefficients without changing external components.
LTC3807HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3807HFE#TRPBF FAQ
1.How can I place an order for LTC3807HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807HFE#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 LTC3807HFE#TRPBF reliable?
The price and inventory of LTC3807HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3807HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807HFE#TRPBF?
LTC3807HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807HFE#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 LTC3807HFE#TRPBF?
For technical support, including LTC3807HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3807HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3807HFE#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 LTC3807HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3807HFE#TRPBF?
All LTC3807HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807HFE#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 LTC3807HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3807HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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