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Analog Devices Inc. LTC3807IFE#PBF
- Part No.:
- LTC3807IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3807IFE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:220
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Product details
Overview
LTC3807IFE#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, 50μA no-load IQ, and phase-lockable switching up to 750kHz - enabling efficient 12V/10A conversion in battery-powered digital systems.
For engineers reviewing the LTC3807IFE#PBF datasheet, LTC3807IFE#PBF pinout, LTC3807IFE#PBF application, or LTC3807IFE#PBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world efficiency curves, soft-start/tracking behavior, and validated alternative options for automotive always-on, distributed power, and portable electronics designs.
Technical Context
The LTC3807IFE#PBF implements a constant-frequency current-mode architecture with OPTI-LOOP® compensation, supporting RSENSE or DCR current sensing and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous conduction). Its 0.8V precision reference and power-good output enable tight regulation across wide VIN/VOUT ranges.
It integrates dual gate drivers (TG/BG), internal 5.1V LDO (INTVCC), EXTVCC switchover capability, and dropout detection with 99% duty cycle support. The PLLIN/MODE pin configures synchronization and light-load behavior, while TRACK/SS enables soft-start or supply tracking via external capacitor or resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 38V - accommodates 12V/24V intermediate buses and Li-ion, lead-acid, or multi-cell battery inputs without external pre-regulation. |
| Output Voltage Range | 0.8V to 24V - programmable via external feedback divider; supports core logic, FPGAs, and industrial I/O rails. |
| No-Load Quiescent Current | 50μA - extends runtime in battery-backed systems by minimizing standby power loss. |
| Switching Frequency Range | 75kHz to 750kHz (phase-lockable); 50kHz–900kHz (programmable) - balances size (inductor/capacitor), EMI, and efficiency for compact PCB layouts. |
| Current Sense Threshold | 22mV to 85mV (selectable via ILIM pin) - enables precise overcurrent protection across varied MOSFET RDS(on) and sense-resistor values. |
| Duty Cycle Max | 99% - sustains regulation during deep dropout (e.g., VIN = 12.5V → VOUT = 12V), critical for automotive cold-crank scenarios. |
| Power Good Accuracy | ±10% window around VFB setpoint with 2.5% hysteresis - ensures reliable system sequencing and fault reporting. |
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 pull-up charges external capacitor for linear VOUT ramp; accepts external voltage divider to track master supply during startup. |
| FREQ (Pin 2) | Oscillator frequency programming | 20µA internal pull-up sets VCO voltage; resistor-to-GND selects 50–900kHz; tie to INTVCC/GND for fixed 535kHz/350kHz. |
| PLLIN/MODE (Pin 3) | Sync input / light-load mode selector | Accepts external clock for phase-locking; grounded = Burst Mode®, tied to INTVCC = forced CCM, mid-voltage = pulse-skipping. |
| 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 operation. |
| SENSE– / SENSE+ (Pins 7/8) | Differential current sense inputs | Measure voltage across RSENSE or DCR network; common-mode range up to 28V supports high-side sensing in buck configurations. |
| VFB (Pin 9) | Feedback voltage input | Compares output voltage (via resistive divider) to 0.800V reference; ±0.8% accuracy over temperature ensures stable regulation. |
| ITH (Pin 10) | Error amplifier output & compensation node | Controls peak inductor current; connects to RC/CC network for OPTI-LOOP® compensation across diverse output capacitors and ESR. |
| PGOOD (Pin 11) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from target; used for system enable/disable sequencing and fault monitoring. |
| TG (Pin 12) | Top N-MOSFET gate driver output | Floating driver with 2.5Ω pull-up/pull-down; supports bootstrap operation; voltage swing = INTVCC superimposed on SW node. |
| SW (Pin 13) | Switch node connection | Connects to inductor and MOSFET source/drain junction; carries high di/dt; requires tight layout to minimize EMI and shoot-through risk. |
| BOOST (Pin 14) | Bootstrap supply for top gate driver | Capacitor between BOOST and SW provides floating bias; Schottky diode from BOOST to INTVCC maintains charge during 100% duty cycle. |
| BG (Pin 15) | Bottom N-MOSFET gate driver output | Ground-referenced driver with 2.4Ω pull-up/1.1Ω pull-down; drives synchronous rectifier with fast 13ns fall time. |
| INTVCC (Pin 16) | Internal LDO output (5.1V) | Powers control circuitry and drivers; decoupled with ≥2.2µF ceramic to PGND; bypassed by EXTVCC when >4.7V. |
| EXTVCC (Pin 17) | External bias input for INTVCC LDO | Enables higher-efficiency biasing from converter output rail; switchover at 4.7V with 250mV hysteresis prevents oscillation. |
| PGND (Pin 18) | Power ground return | Connects to bottom MOSFET source and CIN (–); must be separate from SGND to avoid noise coupling into sensitive analog circuits. |
| VIN (Pin 19) | Main input supply | 4V–38V input; bypassed with ceramic capacitor to SGND; powers internal VIN LDO when EXTVCC is inactive. |
| ILIM (Pin 20) | Current limit threshold select | Ground = 22mV, FLOAT = 43mV, INTVCC = 64mV max sense voltage - configures foldback protection level without external components. |
| SGND (Pins 4,5,21) | Small-signal ground | Must be routed separately from PGND; pins 4/5 and exposed pad (21) all connect to same low-noise analog ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (10µF–1000µF) and ESR (0.5mΩ–100mΩ) without redesigning compensation network. |
| Selectably Efficient Light-Load Operation | Burst Mode® achieves >85% efficiency at 1mA load; pulse-skipping reduces ripple vs Burst; forced CCM maintains low-noise output for noise-sensitive loads. |
| 99% Maximum Duty Cycle with Dropout Detection | Enables regulation down to VIN – VOUT ≤ 0.5V; internal detector forces periodic TG off-time to recharge BOOST capacitor during sustained dropout. |
| Programmable Current Limit with Foldback | Three ILIM-selectable thresholds (22/43/64mV) plus automatic foldback reduce MOSFET stress during short-circuit events without external circuitry. |
| Robust Power Sequencing Support | TRACK/SS pin enables monotonic soft-start or precise voltage tracking; PGOOD provides ±10% accurate output monitoring for FPGA/CPU reset assertion. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
|
Use Scenario: Maintaining microcontroller, CAN transceiver, and sensor power during vehicle ignition-off (12V battery, cold-crank down to 6V). IC Role / Device Role / Timing Role: Primary step-down controller regulating 3.3V/5V rails from unregulated 6V–16V battery input. Use Value: 50μA quiescent current minimizes parasitic drain; 99% duty cycle sustains output during cranking; PGOOD enables safe MCU wake-up sequencing. |
Use Scenario: Powering portable medical monitors or handheld test equipment with Li-ion (3.0V–4.2V) or 2-cell alkaline (2.0V–3.2V) batteries. IC Role / Device Role / Timing Role: High-efficiency buck controller generating stable 1.8V/3.3V for SoC, display, and ADC subsystems. Use Value: Burst Mode® extends battery life >3× vs forced CCM at light loads; wide VIN range eliminates need for pre-buck stage. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
|
Use Scenario: Converting 24V/48V backplane voltage to isolated 5V/12V rails for modular I/O cards in PLC chassis. IC Role / Device Role / Timing Role: Non-isolated point-of-load controller delivering up to 10A with precise remote sensing and current limiting. Use Value: RSENSE/DCR sensing flexibility supports low-loss inductor selection; phase-lockable frequency simplifies EMI filtering across multiple converters. |
Use Scenario: Regulating FPGA core (1.0V), I/O (3.3V), and auxiliary (5V) rails in fanless industrial gateways operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable controller with guaranteed –40°C to +125°C junction operation and ±0.8% VREF accuracy. Use Value: Internal LDO (INTVCC) and EXTVCC switchover ensure consistent gate drive under varying input conditions; robust UVLO prevents brownout resets. |
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 |
|---|---|---|---|
| LTC3892IFE#PBF | Dual-channel, 4–60V input, 55μA IQ, includes integrated MOSFET drivers and PMBus interface; larger 32-pin QFN package. | Supports dual-output or interleaved designs; PMBus enables telemetry and dynamic configuration not available in LTC3807IFE#PBF. | Choose LTC3892IFE#PBF when needing dual outputs, telemetry, or wider input range; LTC3807IFE#PBF remains optimal for single-channel cost- and size-sensitive designs. |
| MP2918GL-Z | Single-channel, 4.5–36V input, 60μA IQ, 500kHz fixed frequency, no PLL or Burst Mode; 16-pin QFN package. | Lacks light-load mode selection, phase-locking, and TRACK/SS functionality; simpler compensation but less flexible for low-noise or ultra-low-IQ use cases. | Choose MP2918GL-Z for basic, low-cost buck control where Burst Mode® and soft-start tracking are unnecessary; LTC3807IFE#PBF offers superior efficiency control and sequencing features. |
Compared with LTC3892IFE#PBF and MP2918GL-Z, the LTC3807IFE#PBF uniquely balances ultra-low 50μA quiescent current, programmable light-load behavior, and precise soft-start/tracking - making it ideal for single-rail, battery-conscious, and automotive always-on applications where feature density and footprint are constrained.
Availability
LTC3807IFE#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, long-term lifecycle support, and guaranteed −40°C to +125°C operation.
Supply support for LTC3807IFE#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, inheriting its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LTC3807IFE#PBF 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, and robust protection are mandatory.
FAQ
What is the maximum output voltage supported by the LTC3807IFE#PBF?
The LTC3807IFE#PBF supports an output voltage range of 0.8V to 24V, set by an external resistive feedback divider connected to the VFB pin. Its internal 0.800V reference and precision error amplifier maintain ±0.8% regulation accuracy over temperature, enabling stable generation of standard logic rails (1.2V, 1.8V, 3.3V, 5V, 12V) and higher intermediate voltages up to 24V.
How does the LTC3807IFE#PBF achieve ultra-low quiescent current in shutdown mode?
The LTC3807IFE#PBF draws only 14μA in full shutdown when the RUN pin voltage falls below 0.7V, disabling both the main control loop and internal LDOs (VIN and EXTVCC paths). This is achieved through dedicated low-leakage bias circuitry and complete gate driver disablement - critical for preserving battery charge in always-on automotive modules and portable instrumentation.
Can the LTC3807IFE#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC3807IFE#PBF supports external synchronization via the PLLIN/MODE pin, accepting clock inputs from 75kHz to 750kHz. When an external clock is applied, the internal phase-locked loop aligns the rising edge of the TG signal to the external clock's rising edge, enabling deterministic EMI reduction and multi-converter interleaving without additional timing ICs.
What are the three current limit threshold options for the LTC3807IFE#PBF, and how are they selected?
The LTC3807IFE#PBF offers three programmable current limit thresholds - 22mV, 43mV, and 64mV - selected by connecting the ILIM pin to SGND, FLOAT (open), or INTVCC respectively. These thresholds directly set the maximum allowable voltage across the current sense element (RSENSE or DCR), enabling scalable overcurrent protection without external resistors or calibration.
Does the LTC3807IFE#PBF support both RSENSE and DCR current sensing, and what design considerations apply?
Yes, the LTC3807IFE#PBF supports both discrete sense-resistor (RSENSE) and inductor DCR sensing via its differential SENSE+ and SENSE– inputs. For RSENSE, place the resistor between PGND and the bottom MOSFET source; for DCR, use an RC network from SW to SENSE+ and SENSE– to PGND to compensate for inductor parasitics and temperature drift.
LTC3807IFE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LTC3807IFE#PBF FAQ
1.How can I place an order for LTC3807IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3807IFE#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 LTC3807IFE#PBF reliable?
The price and inventory of LTC3807IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3807IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3807IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3807IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3807IFE#PBF?
LTC3807IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3807IFE#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 LTC3807IFE#PBF?
For technical support, including LTC3807IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3807IFE#PBF requirements.
6.How does Aetrix verify that LTC3807IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3807IFE#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 LTC3807IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3807IFE#PBF?
All LTC3807IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3807IFE#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 LTC3807IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3807IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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