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Analog Devices Inc. LTC3807MPFE#PBF
- Part No.:
- LTC3807MPFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3807MPFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,098
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Product details
Overview
LTC3807MPFE#PBF 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 operates down to 50μA no-load IQ - enabling long battery runtime in automotive always-on and portable digital systems.
For engineers reviewing the LTC3807MPFE#PBF datasheet, LTC3807MPFE#PBF pinout, LTC3807MPFE#PBF application, or LTC3807MPFE#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, selectable light-load modes (Burst Mode®/pulse-skipping/forced continuous), OPTI-LOOP® compensation, and dual current-sense options (RSENSE or DCR).
Technical Context
The LTC3807MPFE#PBF implements constant-frequency current-mode control with an internal transconductance error amplifier (gm = 2 mmho) and precision 0.8V feedback reference (±1.2mV over –55°C to 150°C). Its PLLIN/MODE pin configures light-load behavior via external voltage level, while ITH serves as both error amplifier output and current limit control point.
It integrates dual LDOs: one powered from VIN (4.85V–5.35V INTVCC), another switchover-enabled from EXTVCC (≥4.7V), supporting efficient self-biasing from regulated outputs. Gate drivers deliver 2.5Ω TG pull-up / 1.5Ω BG pull-down on-resistance with <30ns transition delays and 95ns minimum on-time for high-frequency, high-duty-cycle operation (up to 99%).
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; enables single-controller flexibility across multiple rail requirements. |
| No-Load Quiescent Current | 50μA - extends battery life in always-on applications without sacrificing regulation accuracy. |
| Switching Frequency Range | 75kHz to 750kHz - phase-lockable to external clock or programmable via FREQ pin resistor; enables EMI optimization and compact magnetics. |
| Current Sense Options | RSENSE or DCR sensing - supports high-efficiency, low-heat dissipation designs using either discrete shunt or inductor DCR. |
| Operating Temperature Range | –55°C to 150°C - qualified for harsh-environment automotive and industrial applications requiring extended thermal margin. |
| Shutdown Current | 14μA - ultra-low power disable state ideal for system-level power sequencing and energy-sensitive wake-up circuits. |
Pinout & Package
Package: 20-lead plastic TSSOP with exposed pad (Pin 21 = SGND); θJA = 38°C/W; RoHS-compliant lead-free finish.
| 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; accepts external voltage divider to synchronize startup with other rails. |
| FREQ (Pin 2) | Oscillator frequency programming | 20μA internal pull-up sets VCO voltage; resistor-to-GND selects 50kHz–900kHz fixed frequency; GND/INTVCC forces 350kHz/535kHz. |
| 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 = phase-locked operation. |
| RUN (Pin 6) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down entire IC (14μA IQ); internal 7μA pull-up allows floating for always-on use. |
| SENSE– / SENSE+ (Pins 7, 8) | Differential current sense inputs | Support RSENSE or DCR sensing; common-mode range up to 28V; bias current ±1µA minimizes measurement error. |
| VFB (Pin 9) | Feedback voltage input | Compares output divider voltage to 0.8V reference; ±5nA input current ensures minimal divider loading and high accuracy. |
| ITH (Pin 10) | Error amplifier output & current limit control | Directly sets peak inductor current; gm = 2 mmho enables stable loop compensation across wide ESR/capacitance ranges. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; 25µs fault delay prevents false triggering during transients. |
| TG (Pin 12) | Top N-MOSFET gate driver output | Floating driver with 2.5Ω pull-up; supports bootstrap operation up to 46V BOOST-SW differential; 95ns min on-time enables high VIN/VOUT ratios. |
| SW (Pin 13) | Switch node connection | Connects to inductor and bootstrap capacitor; rated –5V to 40V; critical for layout integrity and EMI control. |
| BOOST (Pin 14) | Bootstrap supply for top gate driver | Charged via external Schottky diode from INTVCC; swing = INTVCC to (VIN + INTVCC); dropout detector refreshes CB every 10 cycles. |
| BG (Pin 15) | Bottom N-MOSFET gate driver output | Ground-referenced driver with 1.1Ω pull-down; complements TG for synchronous rectification and >95% efficiency at full load. |
| INTVCC (Pin 16) | Internal LDO output (5.1V) | Powers control circuitry and gate drivers; requires ≥2.2µF ceramic decoupling to PGND; switchover to EXTVCC above 4.7V improves efficiency. |
| PGND (Pin 18) | Power ground return | Connects to bottom MOSFET source and CIN (–); must be separate from SGND but tied at single point near CIN to minimize noise coupling. |
| VIN (Pin 19) | Main input supply | Accepts 4V–38V; bypassed to SGND with low-ESR capacitor; powers VIN LDO and internal logic before EXTVCC takeover. |
| ILIM (Pin 20) | Current limit threshold select | GND/FLOAT/INTVCC sets max sense voltage to 22/43/64mV - adjusts current limit without changing RSENSE value. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable transient response across diverse output capacitors (ceramic, polymer, electrolytic) and ESR values without redesigning compensation network. |
| Selectably Optimized Light-Load Efficiency | Burst Mode® (50μA IQ), pulse-skipping, or forced continuous conduction - user-selectable per application trade-off between ripple, efficiency, and EMI. |
| Wide Output Voltage Programmability | 0.8V–24V range with ±0.8% reference accuracy (–55°C to 150°C) - eliminates need for multiple controllers in multi-rail systems. |
| Robust Overvoltage & Short-Circuit Protection | Output overvoltage protection at VFB >±10%; current foldback limits MOSFET dissipation during shorts without disabling startup sequence. |
| Dropout-Aware Bootstrap Refresh | Integrated dropout detector forces periodic TG off-time to recharge BOOST capacitor when VIN ≈ VOUT - maintains gate drive in 99% duty cycle operation. |
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 system rails with ultra-low quiescent current. Use Value: 50μA no-load IQ and –55°C to 150°C rating ensure reliable cold-cranking and extended parking runtime without battery drain. |
Use Scenario: Supplying FPGA, DSP, or microprocessor cores in portable test equipment and handheld instruments. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller delivering up to 10A at 12V output from 24V input with tight voltage regulation. Use Value: Phase-lockable 750kHz operation enables small 2.2µH inductors and low-profile 22µF ceramic output caps - reducing board area by >35% vs lower-frequency alternatives. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
|
Use Scenario: Intermediate bus conversion in telecom and datacom systems with 48V or 24V backplanes. IC Role / Device Role / Timing Role: Wide 4V–38V input range accommodates fluctuating bus voltages; supports remote sensing and precise load regulation. Use Value: RSENSE or DCR current sensing provides accurate current limiting across varying line/load conditions - critical for parallel-phase and hot-swap implementations. |
Use Scenario: Powering PLC I/O modules, motor drives, and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Controller for isolated or non-isolated 5V/12V auxiliary supplies; integrated PGOOD enables safe system power sequencing. Use Value: TRACK/SS pin enables synchronized startup with main CPU rail and soft-start to prevent inrush current tripping upstream breakers. |
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 |
|---|---|---|---|
| LTC3891MPFE#PBF | Includes integrated 5V/100mA bias supply and higher 60V VIN rating; same 20-pin TSSOP package and –55°C to 150°C grade. | Eliminates need for external INTVCC LDO in high-VIN systems; better suited for 48V industrial or PoE-powered applications. | Choose LTC3891MPFE#PBF when bias supply integration and >38V input capability are required; pin-compatible but not functionally identical due to added features. |
| MP2918GL-Z | Monolithic 60V synchronous buck converter (integrated MOSFETs); 500kHz fixed frequency; 40μA IQ; QFN-16 package. | Reduces BOM count and layout complexity but lacks programmable frequency, DCR sensing, and extended temperature range. | Choose MP2918GL-Z for cost-sensitive, space-constrained designs where 10A output and –40°C to 125°C operation suffice; not drop-in compatible. |
Compared with LTC3807MPFE#PBF, LTC3891MPFE#PBF adds integrated bias power and higher input voltage tolerance, while MP2918GL-Z trades configurability and ruggedness for monolithic simplicity - making LTC3807MPFE#PBF optimal for high-reliability, thermally demanding, and highly configurable industrial power designs.
Availability
LTC3807MPFE#PBF 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 across extended temperature and long product lifecycles.
Supply support for LTC3807MPFE#PBF 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 legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LTC3807MPFE#PBF belongs to Linear's high-efficiency synchronous controller product line, designed specifically for demanding power conversion applications requiring ultra-low IQ, wide input/output ranges, and robust operation in extreme thermal environments.
FAQ
What is the operating temperature range of the LTC3807MPFE#PBF?
The LTC3807MPFE#PBF is specified for –55°C to 150°C junction temperature operation and is tested and guaranteed across this full range. This extended grade makes it suitable for under-hood automotive, aerospace, and industrial applications where ambient temperatures exceed standard commercial or industrial limits. The device uses a 20-lead TSSOP package with exposed pad soldered to PCB ground for optimal thermal performance.
How does the LTC3807MPFE#PBF achieve 50μA quiescent current?
The LTC3807MPFE#PBF achieves 50μA no-load IQ through optimized biasing of its current-mode control loop and selective circuit shutdown in Burst Mode® operation. When light-load conditions trigger sleep mode, internal circuitry-including the error amplifier and gate drivers-is gated off while maintaining regulation via the ITH pin's parked voltage (0.450V). This architecture preserves fast wake-up response while minimizing static power draw, directly enabling multi-day battery operation in always-on systems.
Can the LTC3807MPFE#PBF be synchronized to an external clock?
Yes, the LTC3807MPFE#PBF supports external synchronization via the PLLIN/MODE pin. Applying a clean CMOS/TTL clock signal (75kHz–750kHz) to this pin locks the internal VCO to the external source and forces forced continuous conduction mode. This capability reduces EMI by eliminating switching frequency sidebands and enables deterministic timing in multi-rail or multi-phase power systems - critical for noise-sensitive ADCs, RF transceivers, and real-time control applications.
What current sensing methods does the LTC3807MPFE#PBF support?
The LTC3807MPFE#PBF supports both discrete RSENSE and lossless DCR current sensing. Its SENSE+ and SENSE– inputs accept differential signals with ±1µA input bias current and 28V common-mode range, enabling direct connection to either a shunt resistor or a small-signal winding on the output inductor. The ILIM pin further allows hardware-selectable current limit thresholds (22/43/64mV), providing design flexibility without recalculating sense resistor values.
Does the LTC3807MPFE#PBF include output overvoltage protection?
Yes, the LTC3807MPFE#PBF includes dedicated output overvoltage protection. When the VFB pin voltage deviates more than ±10% from its regulated setpoint (e.g., due to feedback divider failure or load dump), the PGOOD output is deasserted and internal protection circuitry limits output voltage excursion. This safeguard prevents damage to downstream loads and complements the precision 0.8V reference (±0.8% over temperature) and tight load/line regulation (±0.1%) inherent to the LTC3807MPFE#PBF design.
LTC3807MPFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3807MPFE#PBF FAQ
1.How can I place an order for LTC3807MPFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807MPFE#PBF 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 LTC3807MPFE#PBF reliable?
The price and inventory of LTC3807MPFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807MPFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3807MPFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807MPFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807MPFE#PBF?
LTC3807MPFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807MPFE#PBF 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 LTC3807MPFE#PBF?
For technical support, including LTC3807MPFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807MPFE#PBF requirements.
6.How does Aetrix verify that LTC3807MPFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3807MPFE#PBF 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 LTC3807MPFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3807MPFE#PBF?
All LTC3807MPFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807MPFE#PBF, 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 LTC3807MPFE#PBF part is unused and in its original packaging.
Return procedure for LTC3807MPFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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