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Analog Devices Inc. LTC3707IGN#TRPBF
- Part No.:
- LTC3707IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3707IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,342
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Product details
Overview
LTC3707IGN#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages for high-efficiency 5V/3.3V power conversion. It features 180° phase interleaving, ±1.5% output voltage accuracy over temperature, 0.8V precision reference, and supports input voltages from 4.5V to 28V - ideal for notebook computers and battery-powered digital systems.
For engineers reviewing the LTC3707IGN#TRPBF datasheet, LTC3707IGN#TRPBF pinout, LTC3707IGN#TRPBF application, or LTC3707IGN#TRPBF equivalent, key selection criteria include dual-channel current-mode control, OPTI-LOOP® compensation for wide output capacitance tolerance, FCB-selectable operating modes (Burst Mode®, constant frequency, forced continuous), and integrated 3.3V linear regulator with 10mA output.
Technical Context
The LTC3707IGN#TRPBF implements a constant-frequency, current-mode architecture with two independent 180° out-of-phase controllers, minimizing input ripple and EMI. Each channel uses differential current sensing (SENSE±), ITH-based error amplification, and programmable oscillator frequency (140–310 kHz via FREQSET).
It integrates dual gate drivers (TG/BG) with bootstrap operation for top-side N-MOSFETs, supports remote voltage sensing (VOSENSE±), and includes dedicated protection: output overvoltage latch (±7.5%), foldback current limiting, and RUN/SS–based short-circuit shutdown with configurable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports Li-ion, multi-cell battery, and industrial DC rails without external pre-regulation. |
| Output Voltage Accuracy | ±1.5% over –40°C to +85°C - ensures stable core/supply rail compliance for microprocessors and FPGAs. |
| Reference Voltage | 0.800V (±12mV) - enables precise feedback scaling for 3.3V, 5V, or custom outputs using standard resistor dividers. |
| Oscillator Frequency Range | 140kHz to 310kHz - adjustable via FREQSET pin; higher frequencies reduce inductor size, lower frequencies improve light-load efficiency. |
| Max Duty Cycle | 99.4% - enables ultra-low dropout operation (e.g., 5V out from 5.2V in), critical for battery end-of-discharge scenarios. |
| Quiescent Current (Shutdown) | 20μA - minimizes standby power loss in portable devices requiring long sleep duration. |
| Integrated 3.3V LDO | 10mA DC / 50mA peak - powers auxiliary circuitry (e.g., supervisors, level shifters) without external regulators. |
Pinout & Package
Package: 28-Lead Plastic SSOP (GN), RoHS-compliant, 5.6mm × 10.2mm body, 0.635mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & run control inputs | Capacitor-programmable ramp time; also triggers timed short-circuit shutdown when voltage drops below 1.0V. |
| SENSE1+, SENSE2+ / SENSE1–, SENSE2– (Pins 2,3,13,14) | Differential current sense inputs | Enable accurate peak-current mode control with RSENSE; common-mode range up to INTVCC + 1.1V. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote feedback voltage inputs | Accept resistive divider output for precise regulation; reject PCB trace IR drop in high-current applications. |
| FCB (Pin 7) | Forced Continuous/Burst Mode selector | Voltage-controlled mode selection: <0.8V = PWM, >0.8V & |
| TG1, TG2 / BG1, BG2 (Pins 16,27,19,23) | Top/bottom N-MOSFET gate drivers | High-current (3A peak) drivers with matched rise/fall times (60/110ns); TG floats on SW node for high-side drive. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low if either VOSENSE deviates >±7.5% - enables system sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| 180° phased dual controllers | Halves input capacitor RMS current vs. single-phase, reducing required CIN by ~30% and lowering EMI across 100kHz–1MHz band. |
| OPTI-LOOP® compensation | Enables stable loop response across 10μF–1000μF output capacitance and 1mΩ–100mΩ ESR - eliminates re-tuning for different ceramic/polymer caps. |
| Three selectable operating modes | Burst Mode® (high efficiency at light load), constant frequency (low noise), forced continuous (output sink capability) - selected via single FCB pin. |
| Integrated 3.3V/5V standby regulators | 3.3VOUT pin delivers 10mA with ±2% line/load regulation; INTVCC LDO provides 5V/40mA for internal logic and gate drivers. |
| Comprehensive protection suite | Includes output overvoltage latch, foldback current limiting, RUN/SS–based short-circuit timeout, and undervoltage lockout (3.5V UVLO). |
Applications
| Notebook Power Management | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Dual-rail power delivery (5V main, 3.3V I/O) in ultraportable notebooks with dynamic CPU load changes. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two independent output stages with interleaved switching to minimize input ripple. Use Value: 180° phase shift cuts input capacitor RMS current by 30%, enabling smaller, lower-ESR ceramics and extending battery runtime at full load. |
Use Scenario: Portable multimeter or handheld oscilloscope requiring clean, isolated 3.3V logic and 5V analog supply from single Li-ion cell. IC Role / Device Role / Timing Role: Primary DC/DC controller with integrated 3.3V LDO powering MCU peripherals while maintaining tight output regulation during battery discharge. Use Value: ±1.5% output accuracy and remote sensing ensure ADC reference stability and sensor interface integrity across –40°C to +85°C. |
| DC Power Distribution Systems | Industrial Embedded Controllers |
Use Scenario: Centralized 24V-to-5V/3.3V conversion in DIN-rail mounted PLC backplanes with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency dual-output controller operating in constant frequency mode to meet CISPR-22 conducted emissions requirements. Use Value: Programmable 140–310kHz switching frequency allows EMI peak avoidance; PGOOD enables system-level fault isolation and watchdog reset coordination. |
Use Scenario: Fanless industrial gateway with thermal constraints requiring minimal heat generation during idle operation. IC Role / Device Role / Timing Role: Dual buck controller entering Burst Mode® automatically below 100mA load to maintain <25μA total quiescent draw. Use Value: 20μA shutdown IQ and 125°C junction rating support unventilated enclosures; STBYMD pin enables wake-up from deep sleep via external signal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z (Monolithic Power) | Single-chip dual-phase controller with integrated MOSFETs (30V/15A); no external gate drivers required. Fixed 500kHz frequency, no FCB mode selection. | Lower BOM count but limited to ≤15A per phase; lacks 3.3V LDO and remote sensing. | Choose MP2918GL-Z for space-constrained, medium-current designs where integration outweighs flexibility. |
| LTC3855IUH#PBF | Pin-compatible successor with wider VIN (4.5V–38V), improved current sense accuracy (±0.5%), and enhanced thermal performance (θJA = 40°C/W vs. 95°C/W). | Supports higher input voltages (e.g., 24V industrial rails) and tighter regulation for advanced processors. | Choose LTC3855IUH#PBF for new designs requiring extended voltage range, better accuracy, or improved thermal margin. |
Compared with MP2918GL-Z, LTC3707IGN#TRPBF offers greater design flexibility via external MOSFET selection, remote sensing, and three operating modes - critical for thermally sensitive or EMI-sensitive applications. Compared with LTC3855IUH#PBF, it provides proven reliability in legacy systems but lacks newer features like spread-spectrum clocking and enhanced current monitoring.
Availability
LTC3707IGN#TRPBF is available at Aetrix Electronics and suitable for notebook computing, battery-operated instrumentation, and industrial embedded power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3707IGN#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving aerospace, industrial, automotive, and communications markets.
The LTC3707IGN#TRPBF belongs to Linear's high-efficiency DC/DC controller product line, designed specifically for dual-phase, synchronous step-down conversion in portable and battery-critical applications where input ripple reduction and light-load efficiency are paramount.
FAQ
What is the maximum input voltage rating for the LTC3707IGN#TRPBF?
The LTC3707IGN#TRPBF has an absolute maximum input voltage (VIN) rating of 30V, with recommended operational range of 4.5V to 28V. Exceeding 30V risks permanent damage per Absolute Maximum Ratings. The device includes undervoltage lockout (UVLO) that disables operation below 3.5V nominal, ensuring reliable startup across battery chemistries.
How does the FCB pin affect operating mode selection in the LTC3707IGN#TRPBF?
The FCB pin on the LTC3707IGN#TRPBF selects among three distinct operating modes: pulling FCB <0.8V forces continuous PWM operation; setting FCB between 0.8V and (INTVCC – 2V) enables Burst Mode® for high light-load efficiency; tying FCB to INTVCC disables Burst Mode® and enforces constant-frequency discontinuous conduction mode. Leaving FCB floating is not permitted.
Can the LTC3707IGN#TRPBF drive both high-side and low-side N-channel MOSFETs simultaneously?
Yes - the LTC3707IGN#TRPBF integrates dual high-current gate drivers: TG1/TG2 for top-side N-MOSFETs (floating, bootstrapped) and BG1/BG2 for bottom-side N-MOSFETs (ground-referenced). Each driver supports 3A peak current, with controlled dead-time (80ns min) to prevent shoot-through, enabling fully synchronous rectification in both channels.
What is the purpose of the STBYMD pin on the LTC3707IGN#TRPBF?
The STBYMD pin on the LTC3707IGN#TRPBF provides three-state control: grounded to shut down both controllers via RUN/SS; open to enable normal soft-start; pulled >2V to activate internal 5V and 3.3V LDOs independently of RUN/SS state - allowing "always-on" wake-up circuitry. It decouples common bias paths to optimize standby power and sequencing flexibility.
Does the LTC3707IGN#TRPBF support remote output voltage sensing?
Yes - the LTC3707IGN#TRPBF supports true remote sensing via dedicated VOSENSE1 and VOSENSE2 pins (Pins 4 and 12), which accept feedback signals from external resistor dividers placed directly at the load. This compensates for PCB trace resistance and ensures ±1.5% regulation accuracy at the point-of-load, critical for high-current or long-trace applications.
LTC3707IGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 28V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3707IGN#TRPBF FAQ
1.How can I place an order for LTC3707IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3707IGN#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 LTC3707IGN#TRPBF reliable?
The price and inventory of LTC3707IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3707IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3707IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3707IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3707IGN#TRPBF?
LTC3707IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3707IGN#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 LTC3707IGN#TRPBF?
For technical support, including LTC3707IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3707IGN#TRPBF requirements.
6.How does Aetrix verify that LTC3707IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3707IGN#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 LTC3707IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3707IGN#TRPBF?
All LTC3707IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3707IGN#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 LTC3707IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3707IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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