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Analog Devices Inc. LTC3707IGN-SYNC#PBF
- Part No.:
- LTC3707IGN-SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3707IGN-SYNC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,994
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Product details
Overview
LTC3707IGN-SYNC#PBF from Analog Devices (formerly Linear Technology) is a dual-phase, constant-frequency current-mode synchronous step-down controller driving two independent N-channel MOSFET stages. It delivers ±1.5% output voltage accuracy, 180° phase interleaving up to 300kHz, and supports 4.5V–28V input with dual 5V/3.3V outputs - used in notebook CPU core and I/O power rails.
For engineers reviewing the LTC3707IGN-SYNC#PBF datasheet, LTC3707IGN-SYNC#PBF pinout, LTC3707IGN-SYNC#PBF application, or LTC3707IGN-SYNC#PBF equivalent, key selection criteria include phase-lockable frequency control, OPTI-LOOP compensation for wide-output-capacitance stability, dual remote sense capability, and integrated 3.3V linear regulator for auxiliary rail generation.
Technical Context
The LTC3707IGN-SYNC#PBF implements a dual-channel, 180° out-of-phase current-mode architecture with independent error amplifiers (ITH1/ITH2), differential current sensing (SENSE±), and synchronized top/bottom gate drivers (TG1/BG1, TG2/BG2). Each channel features programmable soft-start via RUN/SS pins and foldback current limiting during short-circuit events.
Its PLLIN/PLLFLTR interface enables external synchronization or DC voltage-controlled frequency tuning from 140kHz to 310kHz. The FCB pin selects between Burst Mode®, forced continuous conduction, or secondary winding regulation - all while maintaining independent VOSENSE1/VOSENSE2 feedback paths with ±7.5% PGOOD monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V (30V absolute max); supports Li-ion, Li-poly, and 12V/24V industrial rails. |
| Output Voltage Accuracy | ±1.5% over temperature; enables tight regulation for microprocessor core and I/O supplies. |
| Switching Frequency | 140kHz–310kHz (DC-tunable via PLLFLTR); phase-lockable to external clock on PLLIN. |
| Feedback Reference | 0.800V ±12mV; precision reference compatible with future low-voltage microprocessors. |
| Power Good Threshold | ±7.5% of setpoint on either VOSENSE pin; open-drain PGOOD asserts low if either output deviates. |
| Shutdown Quiescent Current | 20μA; enables ultra-low-power system standby without disabling auxiliary 3.3VOUT rail. |
| Integrated 3.3V LDO | 3.35V ±50mV at 10mA; powers auxiliary logic or level-shifters without external regulator. |
Pinout & Package
Package: 28-Lead Plastic SSOP (0.150″ wide), –40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & latchoff control inputs | Capacitor-based ramp controls startup current; falling below 1.0V shuts down respective channel. |
| SENSE1+, SENSE2+ / SENSE1–, SENSE2– (Pins 2,3,13,14) | Differential current sense inputs | Measure RSENSE voltage drop to set peak inductor current limit per channel. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote output voltage feedback | Accepts resistive divider signal; enables accurate regulation despite PCB trace IR drop. |
| FCB (Pin 7) | Mode selection control | Voltage <0.8V forces continuous conduction; 0.8V–2.8V enables Burst Mode®; >4.3V disables burst. |
| TG1, TG2 / BG1, BG2 (Pins 16,27,19,23) | High-current gate drivers | TG drives top N-MOSFETs (floating); BG drives bottom N-MOSFETs (ground-referenced). |
| PGOOD (Pin 28) | Open-drain status output | Pulled low if either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V. |
Key Features
| Feature | Design Value |
|---|---|
| 180° phase interleaving | Reduces RMS input current by ~39% vs. in-phase dual controllers, lowering input capacitor size and EMI. |
| OPTI-LOOP® compensation | Enables stable loop response across wide COUT/ESR ranges without manual compensation redesign. |
| Dual independent current sensing | Per-channel SENSE± inputs support asymmetric output configurations (e.g., 5V/3.3V @ 5A each). |
| Integrated 3.3V linear regulator | Delivers 10mA DC (50mA peak) from INTVCC; eliminates need for external 3.3V bias supply. |
| Programmable short-circuit protection | RUN/SS capacitor sets timed latchoff; foldback limits MOSFET dissipation during sustained overload. |
Applications
| Mobile Computing Power | Telecom DC Distribution |
|---|---|
|
Use Scenario: Dual-rail power delivery for Intel/AMD mobile CPUs requiring separate core (VDD) and I/O (VDDIO) supplies. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller generating tightly regulated 1.2V/1.8V core and 3.3V/5V I/O rails with coordinated soft-start. Use Value: 180° interleaving cuts input ripple current by >35%, enabling smaller ceramic input capacitors and reducing battery stress in portable systems. |
Use Scenario: Distributed power architecture in 48V telecom line cards supplying multiple point-of-load converters. IC Role / Device Role / Timing Role: Primary controller stepping 48V down to intermediate 5V/3.3V rails feeding downstream POL modules. Use Value: Wide 4.5V–28V input range accommodates 48V-to-12V intermediate bus; PGOOD enables system-level power sequencing and fault reporting. |
| Industrial Embedded Systems | Battery-Powered Instrumentation |
|
Use Scenario: Reliable dual-output power for FPGA-based control units in factory automation equipment. IC Role / Device Role / Timing Role: Controller managing isolated 5V logic and 3.3V analog subsystems with independent remote sensing and thermal derating. Use Value: ±1.5% output accuracy and –40°C to +85°C rating ensure stable operation in uncontrolled industrial environments. |
Use Scenario: Long-life portable test equipment powered by Li-ion packs with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency dual buck controller supporting Burst Mode® for microamp-level standby and full-load PWM operation. Use Value: 20μA shutdown IQ extends battery runtime; adjustable soft-start prevents inrush damage to aging cells. |
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 |
|---|---|---|---|
| LTC3728CUH#PBF | Single-channel, 30V max VIN, no integrated 3.3V LDO, 6mm × 6mm QFN package. | Requires external 3.3V bias; suited for space-constrained single-rail designs where dual-phase isn't needed. | Select when only one high-current output is required and board area is critical. |
| MP8772GQ-Z | Monolithic dual-phase controller (integrated MOSFETs), 16V max VIN, fixed 500kHz switching. | No external MOSFET flexibility; limited input voltage range excludes 24V/28V industrial use. | Select for cost-sensitive, lower-power applications where integration outweighs input range and configurability needs. |
Compared with LTC3707IGN-SYNC#PBF, LTC3728CUH#PBF offers higher voltage tolerance but lacks dual-channel coordination and auxiliary regulation, while MP8772GQ-Z trades design flexibility for reduced BOM count and footprint - making LTC3707IGN-SYNC#PBF optimal for high-reliability, multi-rail industrial and computing systems demanding wide input range and precise sequencing.
Availability
LTC3707IGN-SYNC#PBF is available at Aetrix Electronics and suitable for notebook power management, telecom DC distribution, and industrial embedded systems requiring stable component supply with long lifecycle assurance.
Supply support for LTC3707IGN-SYNC#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3707IGN-SYNC#PBF belongs to Linear's high-efficiency dual-phase controller family, designed specifically for noise-sensitive, high-current applications where input ripple reduction and precise multi-rail sequencing are critical.
FAQ
What is the maximum supported switching frequency for LTC3707IGN-SYNC#PBF?
The LTC3707IGN-SYNC#PBF supports a tunable oscillator range from 140kHz to 310kHz via the PLLFLTR pin, with phase-lockable operation up to 300kHz when synchronized to an external clock on PLLIN. Its absolute maximum rated frequency is 300kHz under standard operating conditions, consistent with its current-mode architecture and gate driver timing specifications.
Does LTC3707IGN-SYNC#PBF support remote voltage sensing on both outputs?
Yes, LTC3707IGN-SYNC#PBF provides dedicated VOSENSE1 and VOSENSE2 pins for independent remote sensing on each output channel. This allows precise regulation at the load point by compensating for PCB trace resistance, ensuring ±1.5% accuracy even with milliohm-level IR drops between the converter and target ICs.
How does the FCB pin affect operating mode selection in LTC3707IGN-SYNC#PBF?
The FCB pin on LTC3707IGN-SYNC#PBF selects among three modes: voltage <0.8V forces continuous conduction; 0.8V–2.8V enables Burst Mode® for light-load efficiency; >4.3V disables burst and enforces constant-frequency PWM. This pin operates identically across both channels and can also regulate a secondary winding when used with auxiliary transformer feedback.
What is the function of the 3.3VOUT pin on LTC3707IGN-SYNC#PBF?
The 3.3VOUT pin on LTC3707IGN-SYNC#PBF is an integrated linear regulator output delivering 3.35V ±50mV at up to 10mA DC (50mA peak). It is powered from INTVCC and intended for biasing auxiliary circuitry such as level shifters, supervisors, or logic interfaces - eliminating the need for a discrete 3.3V LDO in many designs.
Can LTC3707IGN-SYNC#PBF operate with input voltages below 4.5V?
No, LTC3707IGN-SYNC#PBF has a specified minimum input voltage of 4.5V and an undervoltage lockout (UVLO) threshold of 3.5V–4.0V. Operation below 4.5V violates the guaranteed performance envelope; attempting to power it from a deeply discharged Li-ion cell (<3.6V) will cause UVLO shutdown and prevent regulation.
LTC3707IGN-SYNC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-SYNC#PBF FAQ
1.How can I place an order for LTC3707IGN-SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3707IGN-SYNC#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 LTC3707IGN-SYNC#PBF reliable?
The price and inventory of LTC3707IGN-SYNC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3707IGN-SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3707IGN-SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3707IGN-SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3707IGN-SYNC#PBF?
LTC3707IGN-SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3707IGN-SYNC#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 LTC3707IGN-SYNC#PBF?
For technical support, including LTC3707IGN-SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3707IGN-SYNC#PBF requirements.
6.How does Aetrix verify that LTC3707IGN-SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3707IGN-SYNC#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 LTC3707IGN-SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3707IGN-SYNC#PBF?
All LTC3707IGN-SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3707IGN-SYNC#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 LTC3707IGN-SYNC#PBF part is unused and in its original packaging.
Return procedure for LTC3707IGN-SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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