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Analog Devices Inc. LTC3707EGN-SYNC#TRPBF
- Part No.:
- LTC3707EGN-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3707EGN-SYNC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,577
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Product details
Overview
LTC3707EGN-SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving all-N-channel MOSFET stages. It delivers ±1.5% output voltage accuracy, 180° phase-shifted operation up to 300kHz, and supports 4.5V–28V input with 0.8V reference for 5V/3.3V microprocessor core supplies in notebook computers.
For engineers reviewing the LTC3707EGN-SYNC#TRPBF datasheet, LTC3707EGN-SYNC#TRPBF pinout, LTC3707EGN-SYNC#TRPBF application, or LTC3707EGN-SYNC#TRPBF equivalent, key selection criteria include phase-lockable frequency synchronization, OPTI-LOOP compensation for wide output capacitance tolerance, dual independent RUN/SS soft-start control, and integrated 3.3V linear regulator with 10mA output.
Technical Context
The LTC3707EGN-SYNC#TRPBF implements constant-frequency current-mode control with two independent 180° out-of-phase channels, each featuring transconductance error amplifiers (gm = 1.3 mmho, GBW = 3 MHz) and precision 0.8V feedback references. Its phase-locked loop accepts external sync signals via PLLIN and allows DC tuning of oscillator frequency (140–310 kHz) through PLLFLTR.
It integrates dual N-channel gate drivers (TG/BG), internal 5V LDO (INTVCC), external VCC switchover (EXTVCC ≥ 4.7V), and dedicated protection circuitry including latched short-circuit shutdown (via RUN/SS discharge), output overvoltage lockout (0.84–0.88V threshold), and foldback current limiting activated below 70% nominal VOUT.
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 CPU/GPU core supplies. |
| Switching Frequency | 140–310 kHz (PLL-tunable); 180° interleaving reduces RMS input ripple by ~39% vs single-phase. |
| Reference Voltage | 0.800 V ±1.5%; compatible with future low-voltage microprocessors and SoCs. |
| Shutdown IQ | 20 μA; minimizes battery drain in portable standby modes. |
| Power Good Threshold | ±7.5% window on both outputs; open-drain PGOOD asserts low if either channel deviates. |
| Current Sense Threshold | 65–88 mV (adjustable via RSENSE); sets peak inductor current limit with ±1.5% accuracy. |
Pinout & Package
Package: 28-lead narrow SSOP (GN), 0.150″ wide, –40°C to +85°C operating range. RoHS-compliant, lead-free finish (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (1, 15) | Soft-start & latchoff timer inputs | Capacitor-based ramp controls startup current slew rate; <1.0V forces shutdown; >4.75V arms short-circuit latch. |
| SENSE1+, SENSE2+ / SENSE1–, SENSE2– (2,14 / 3,13) | Differential current sense inputs | Measure voltage across RSENSE to set per-channel peak current limit; common-mode range up to 1.6V. |
| VOSENSE1, VOSENSE2 (4, 12) | Remote feedback inputs | Accept resistive divider output for precise output voltage regulation; ±7.5% PGOOD trigger point. |
| PLLFLTR, PLLIN (5, 6) | PLL filter & sync input | DC voltage on PLLFLTR sets oscillator frequency; PLLIN accepts external clock (50kΩ internal termination) for phase alignment. |
| FCB (7) | Forced continuous/burst mode select | <0.8V forces continuous conduction; 0.8–2.8V enables Burst Mode; >4.3V disables burst (constant frequency). |
| ITH1, ITH2 (8, 11) | Error amplifier outputs | Control per-channel current comparator trip point; used for OPTI-LOOP compensation network connection. |
| SGND (9) | Small-signal ground | Must be isolated from PGND to prevent noise coupling into feedback and current sense paths. |
| 3.3VOUT (10) | Integrated linear regulator | Delivers 10mA DC (50mA peak) at 3.20–3.45V; powers auxiliary circuits without external LDO. |
| PGOOD (28) | Open-drain status output | Pulled low when either VOSENSE deviates >±7.5%; requires external pull-up to ≤7V. |
| TG1/TG2, BG1/BG2 (27,16 / 23,19) | Top/bottom gate drivers | Drive N-MOSFET gates with 50–110 ns transition times; TG swing = INTVCC–0.5V referenced to SW node. |
| VIN, INTVCC, EXTVCC (24, 21, 22) | Main input / internal LDO / external VCC | INTVCC = 4.8–5.2V regulated output; EXTVCC >4.7V bypasses internal LDO for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| 180° Interleaved Dual-Phase Control | Reduces input capacitor RMS current by ~39%, enabling smaller, lower-cost ceramic input banks and lowering EMI. |
| OPTI-LOOP Compensation | Allows stable loop response across wide COUT/ESR variations (e.g., 10μF–470μF ceramic or polymer), simplifying design reuse. |
| Programmable Operating Modes | FCB pin selects Burst Mode (high light-load efficiency), constant-frequency PWM (low noise), or forced continuous (secondary winding regulation). |
| Dual Independent Soft-Start | RUN/SS1 and RUN/SS2 support staggered startup sequencing for multi-rail systems and prevent inrush current stacking. |
| Integrated 3.3V Linear Regulator | Eliminates need for external 3.3V bias supply; delivers 10mA with ±2% load regulation for monitoring or level-shifting circuits. |
Applications
| Notebook Computer Power System | Telecom DC Distribution Board |
|---|---|
Use Scenario: Dual-rail 5V/3.3V core and I/O supply for Intel Core i-series or AMD Ryzen mobile processors with dynamic load steps up to 5A. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing interleaved switching, phase synchronization, and coordinated power-good assertion. Use Value: Achieves >90% efficiency at 3A load while reducing input ripple current by 39%, enabling compact 22μF ceramic input capacitors instead of larger tantalum units. | Use Scenario: Intermediate bus converter supplying multiple downstream POLs in 48V telecom shelf systems with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency, phase-locked controller synchronizing to system clock to suppress beat frequencies and meet CISPR-32 conducted emission limits. Use Value: 180° interleaving cuts input RMS current from 2.53A to 1.55A - reducing I²R losses by 2.66× and easing thermal design on shared PCB copper pours. |
| Battery-Powered Portable Instrument | Industrial Embedded Controller |
Use Scenario: Long-life handheld multimeter or oscilloscope using Li-ion battery (3.0–4.2V) with 5V analog front-end and 3.3V digital logic rails. IC Role / Device Role / Timing Role: Wide-input buck controller supporting dropout operation (99% duty cycle), low-IQ shutdown (20μA), and programmable Burst Mode for µA-level sleep current. Use Value: Extends battery runtime by >40% vs non-Burst Mode controllers under light loads (<100mA), with <200mV output ripple during burst cycles. | Use Scenario: DIN-rail mounted PLC CPU module requiring robust 5V/3.3V rails tolerant of 24VDC brownouts and reverse-polarity transients. IC Role / Device Role / Timing Role: Fault-resilient controller with latched short-circuit shutdown, output overvoltage protection, and undervoltage lockout (3.5V threshold). Use Value: Prevents field failures from accidental short circuits or hot-plug events via RUN/SS-based timed latchoff and automatic foldback current limiting. |
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, 600kHz max, no PLL sync, no integrated 3.3V LDO, 38-lead QFN package. | Suitable for space-constrained single-output designs where phase sync and auxiliary rail not required. | Select when only one high-current rail is needed and board area favors QFN over SSOP. |
| MP2918GL-Z | Monolithic dual-phase controller (integrated MOSFETs), 4.5–28V input, 0.6–5.5V output, no PLLIN, no 3.3VOUT pin. | Targeted at cost-sensitive consumer applications where integration outweighs programmability and protection granularity. | Choose for simplified BOM and layout when discrete FETs are undesirable and full feature set of LTC3707EGN-SYNC#TRPBF is unnecessary. |
Compared with LTC3728CUH#TRPBF and MP2918GL-Z, the LTC3707EGN-SYNC#TRPBF uniquely combines dual-channel phase synchronization, integrated 3.3V bias rail, and independent RUN/SS fault management-making it optimal for high-reliability, multi-rail embedded systems requiring precise sequencing and robust protection.
Availability
LTC3707EGN-SYNC#TRPBF is available at Aetrix Electronics and suitable for notebook computer power systems, telecom DC distribution boards, and battery-powered portable instruments requiring stable component supply with long-term lifecycle support.
Supply support for LTC3707EGN-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand its power management portfolio.
The LTC3707-SYNC product line was designed specifically for high-efficiency, dual-phase synchronous buck conversion in portable and space-constrained computing platforms, emphasizing phase interleaving, precision regulation, and comprehensive fault protection.
FAQ
What is the maximum input voltage rating for the LTC3707EGN-SYNC#TRPBF?
The LTC3707EGN-SYNC#TRPBF has an absolute maximum input voltage (VIN) rating of 30V. Continuous operation is specified from 4.5V to 28V, making it compatible with 24V industrial rails, 12V automotive systems, and multi-cell Li-ion batteries. Exceeding 30V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3707EGN-SYNC#TRPBF support external frequency synchronization?
Yes, the LTC3707EGN-SYNC#TRPBF supports external frequency synchronization via the PLLIN pin (Pin 6), which features a 50kΩ internal termination to SGND. When driven with a clean square wave, the phase-locked loop aligns the rising edge of TG1 with the rising edge of the PLLIN signal, enabling deterministic timing across multiple converters.
How does the FCB pin affect operating mode selection in the LTC3707EGN-SYNC#TRPBF?
The FCB pin (Pin 7) selects among three operating modes: <0.8V forces continuous conduction; 0.8–2.8V enables Burst Mode for high light-load efficiency; >4.3V disables burst (constant-frequency PWM). Leaving FCB floating is prohibited - it must be pulled to a defined voltage or grounded.
What is the function of the 3.3VOUT pin on the LTC3707EGN-SYNC#TRPBF?
Pin 10 (3.3VOUT) is an integrated linear regulator delivering 3.20–3.45V at up to 10mA DC (50mA peak). It provides a clean, low-noise bias supply for auxiliary circuits - eliminating the need for an external 3.3V LDO in many designs and simplifying power tree architecture.
Can the LTC3707EGN-SYNC#TRPBF operate in dropout condition, and what is its minimum on-time?
Yes, the LTC3707EGN-SYNC#TRPBF supports very low dropout operation with up to 99.4% duty cycle. Its minimum on-time is 180ns (tested with square-wave input), enabling regulation down to VOUT ≈ 0.1 × VIN - critical for high-step-down ratios like 24V-to-3.3V conversion.
LTC3707EGN-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
LTC3707EGN-SYNC#TRPBF FAQ
1.How can I place an order for LTC3707EGN-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3707EGN-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 LTC3707EGN-SYNC#TRPBF reliable?
The price and inventory of LTC3707EGN-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 LTC3707EGN-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3707EGN-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3707EGN-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3707EGN-SYNC#TRPBF?
LTC3707EGN-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3707EGN-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 LTC3707EGN-SYNC#TRPBF?
For technical support, including LTC3707EGN-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3707EGN-SYNC#TRPBF requirements.
6.How does Aetrix verify that LTC3707EGN-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3707EGN-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 LTC3707EGN-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3707EGN-SYNC#TRPBF?
All LTC3707EGN-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3707EGN-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 LTC3707EGN-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3707EGN-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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