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Analog Devices Inc. LTC3707IGN-SYNC#TRPBF
- Part No.:
- LTC3707IGN-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3707IGN-SYNC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,678
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Product details
Overview
LTC3707IGN-SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down DC/DC controller IC driving all-N-channel MOSFET stages for high-efficiency power conversion. It delivers ±1.5% output voltage accuracy, 180° out-of-phase operation up to 300kHz, and supports 4.5V–28V input with dual 0.8V reference outputs - used in notebook CPU core and I/O rail regulation.
For engineers reviewing the LTC3707IGN-SYNC#TRPBF datasheet, LTC3707IGN-SYNC#TRPBF pinout, LTC3707IGN-SYNC#TRPBF application, or LTC3707IGN-SYNC#TRPBF equivalent, key selection criteria include phase-lockable frequency control, OPTI-LOOP compensation for wide output capacitance tolerance, dual independent RUN/SS soft-start and short-circuit protection, and integrated 3.3V linear regulator output.
Technical Context
The LTC3707IGN-SYNC#TRPBF implements a constant-frequency current-mode architecture with two independent 180° interleaved control loops, each featuring transconductance error amplifiers (gm = 1.3 mmho, GBW = 3 MHz) and precision 0.8V feedback references. Phase synchronization is achieved via PLLIN/PLLFLTR pins enabling external clock locking across 140–310 kHz.
It integrates dual N-channel gate drivers (TG/BG), internal 5V INTVCC LDO with EXTVCC switchover (4.7V threshold), 3.3V linear regulator (±2% load regulation), and comprehensive protection including output overvoltage latch (±7.5%), foldback current limiting, and latched short-circuit shutdown via RUN/SS discharge timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V (30V absolute max); supports Li-ion, LiPo, and 12V/24V industrial rails. |
| Output Voltage Accuracy | ±1.5% over temp; enables tight regulation for microprocessor core/I/O supplies. |
| Switching Frequency | 150–300kHz fixed or phase-locked; 180° interleaving reduces input RMS current by ~39% vs single-phase. |
| Feedback Reference | Precision 0.8V (±1.5%); compatible with standard resistor dividers for 1.2V–5V outputs. |
| Power Good Threshold | ±7.5% window on both VOSENSE1/VOSENSE2; open-drain PGOOD asserts low if either rail deviates. |
| Shutdown Quiescent Current | 20μA; enables ultra-low-power standby in battery-operated systems. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and portable computing environments. |
Pinout & Package
Package: 28-lead narrow SSOP (0.150″ wide), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & run control inputs | Capacitor-based ramp controls startup current; <1.0V forces shutdown; enables timed short-circuit latchoff. |
| SENSE1+/SENSE2+, SENSE1–/SENSE2– (Pins 2,3,13,14) | Differential current sense inputs | Measure RSENSE voltage drop to set peak inductor current; supports accurate current-mode control. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote output voltage feedback | Accepts resistive divider signal; enables precise regulation despite PCB trace IR drop. |
| PLLIN, PLLFLTR (Pins 6, 5) | Phase-locked loop interface | PLLIN accepts external sync clock; PLLFLTR sets oscillator frequency (140–310 kHz) or receives AC/DC control voltage. |
| FCB (Pin 7) | Forced continuous/burst mode select | Pull <0.8V for continuous conduction; 0.8–2.7V enables Burst Mode; >4.3V disables burst (constant freq). |
| TG1/TG2, BG1/BG2 (Pins 27,16,23,19) | N-channel MOSFET gate drivers | TG drives top FETs with floating bootstrap supply; BG drives bottom FETs referenced to PGND. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low if either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V. |
| 3.3VOUT (Pin 10) | Integrated linear regulator output | Supplies 10mA DC / 50mA peak; powers auxiliary circuitry without external LDO. |
Key Features
| Feature | Design Value |
|---|---|
| 180° Interleaved Dual-Phase Control | Reduces input capacitor RMS current by ~39%, enabling smaller, lower-cost input bulk capacitors and lower EMI. |
| OPTI-LOOP Compensation | Allows stable loop response across wide range of output capacitor ESR (1–100 mΩ) and capacitance (10–1000 μF). |
| Dual Independent Soft-Start | Separate RUN/SS pins enable staggered startup of dual rails to limit inrush and avoid input voltage sag. |
| Integrated 3.3V Linear Regulator | Eliminates need for external 3.3V LDO; supports 10mA load with ±2% line/load regulation. |
| Output Overvoltage Protection | Latches bottom FET on during overvoltage events (>±7.5%), clamping VOUT until fault clears. |
| Low Dropout Operation | Supports 99% duty cycle; maintains regulation down to VIN ≈ VOUT + 0.1V (e.g., 5.1V → 5V). |
Applications
| Notebook CPU Core & I/O Power | Telecom DC Distribution System |
|---|---|
Use Scenario: Dual-rail power delivery for Intel/AMD mobile processors requiring tightly regulated 1.2V core and 3.3V/5V I/O supplies with fast transient response. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching, phase synchronization, and coordinated soft-start sequencing. Use Value: 180° phasing cuts input ripple current by ~39%, reducing required input capacitance and EMI filter size while improving efficiency at full load. | Use Scenario: Centralized 48V-to-12V/5V conversion in telecom line cards with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: High-efficiency dual-output controller delivering isolated secondary regulation via FCB pin and remote sensing for long PCB traces. Use Value: ±1.5% output accuracy and ±7.5% PGOOD window ensure compliance with GR-63-CORE telecom power integrity standards. |
| Battery-Powered Portable Instrument | Industrial Embedded Controller Power |
Use Scenario: Compact handheld test equipment powered by 3S Li-ion (9–12.6V) requiring clean, low-noise 3.3V logic and 5V analog rails. IC Role / Device Role / Timing Role: Dual-phase controller operating in Burst Mode at light load (<100mA) and forced continuous mode under dynamic load steps. Use Value: 20μA shutdown IQ and programmable Burst Mode extend battery runtime; OPTI-LOOP ensures stability with ceramic output caps. | Use Scenario: DIN-rail mounted PLC module needing robust 24V-to-5V/3.3V conversion tolerant of wide ambient temperature (–40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade dual buck controller with latched short-circuit protection and overvoltage lockout for field-replaceable power modules. Use Value: –40°C to +85°C guaranteed operation, 30V absolute max VIN, and integrated 3.3V LDO simplify BOM and improve system-level reliability. |
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#TRPBF | Single-channel, higher frequency (up to 1MHz), no integrated 3.3V LDO, no PLL sync, uses external VREF. | Suitable for space-constrained designs needing higher switching frequency but lacking dual-rail coordination or sync capability. | Select when only one output is needed and higher frequency improves size/efficiency trade-off; not drop-in for dual-phase systems. |
| MP2918GL-Z | Dual-phase controller with PMBus interface, digital compensation, 4.5–28V input, but no integrated 3.3V LDO or PLLIN sync pin. | Preferred where telemetry, margining, or firmware-configurable loop response is required in server or networking gear. | Choose for digital power management ecosystems; requires PMBus host and lacks analog sync flexibility of LTC3707IGN-SYNC#TRPBF. |
Compared with LTC3728CUH#TRPBF and MP2918GL-Z, the LTC3707IGN-SYNC#TRPBF uniquely combines dual-phase interleaving, hardware PLL synchronization, integrated 3.3V LDO, and analog Burst Mode control - making it optimal for cost-sensitive, analog-intensive portable and telecom power designs requiring deterministic timing and minimal external components.
Availability
LTC3707IGN-SYNC#TRPBF is available at Aetrix Electronics and suitable for notebook computing, telecom DC distribution, and industrial embedded power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3707IGN-SYNC#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 its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3707IGN-SYNC#TRPBF belongs to Linear's legacy high-efficiency dual-phase controller family, designed specifically for portable computing and telecom infrastructure where interleaved regulation, low quiescent current, and analog flexibility outweigh digital configurability.
FAQ
What is the maximum supported switching frequency for LTC3707IGN-SYNC#TRPBF?
The LTC3707IGN-SYNC#TRPBF supports a phase-lockable frequency range of 150kHz to 300kHz. When synchronized externally via PLLIN, the internal oscillator tracks the input clock; with PLLIN open, frequency defaults to minimum (~140kHz). The absolute maximum specified frequency is 310kHz under PLLFLTR = 2.4V, per Electrical Characteristics table.
Does LTC3707IGN-SYNC#TRPBF require external MOSFETs?
Yes, the LTC3707IGN-SYNC#TRPBF is a controller-only IC and requires external N-channel MOSFETs for both high-side (top) and low-side (bottom) switches in each phase. It provides dedicated TG and BG gate drive outputs with bootstrap support for high-side FETs, but does not integrate any power switches.
How does the FCB pin affect operating mode in LTC3707IGN-SYNC#TRPBF?
The FCB pin on the LTC3707IGN-SYNC#TRPBF selects between three modes: <0.8V forces continuous conduction mode; 0.8–2.7V enables Burst Mode for light-load efficiency; >4.3V disables Burst Mode and enforces constant-frequency PWM. It also supports secondary winding regulation when used with an auxiliary transformer winding.
Can LTC3707IGN-SYNC#TRPBF operate with only one output enabled?
Yes, LTC3707IGN-SYNC#TRPBF supports independent channel control: pulling RUN/SS1 low disables only Channel 1 while Channel 2 remains active, and vice versa. Both channels share common resources (INTVCC, PLL, FCB), but soft-start, current sensing, and feedback are fully independent.
What protection features are built into LTC3707IGN-SYNC#TRPBF?
The LTC3707IGN-SYNC#TRPBF includes output overvoltage protection (latches bottom FET on if VOSENSE exceeds ±7.5%), foldback current limiting during output faults, latched short-circuit shutdown via RUN/SS timing, undervoltage lockout (3.5V), and thermal shutdown (TJ = 125°C). All protections are hardware-based with no software dependency.
LTC3707IGN-SYNC#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-SYNC#TRPBF FAQ
1.How can I place an order for LTC3707IGN-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3707IGN-SYNC#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-SYNC#TRPBF reliable?
The price and inventory of LTC3707IGN-SYNC#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-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3707IGN-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3707IGN-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3707IGN-SYNC#TRPBF?
LTC3707IGN-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3707IGN-SYNC#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-SYNC#TRPBF?
For technical support, including LTC3707IGN-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3707IGN-SYNC#TRPBF requirements.
6.How does Aetrix verify that LTC3707IGN-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3707IGN-SYNC#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-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3707IGN-SYNC#TRPBF?
All LTC3707IGN-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3707IGN-SYNC#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-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3707IGN-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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