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Analog Devices Inc. LTC1628CG-SYNC#PBF
- Part No.:
- LTC1628CG-SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628CG-SYNC#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:251
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Product details
Overview
LTC1628CG-SYNC from Analog Devices (formerly Linear Technology) is a dual-phase, synchronous step-down switching regulator controller driving two independent N-channel MOSFET stages for 5V and 3.3V outputs. It features ±1% output voltage accuracy, 150kHz–300kHz phase-lockable fixed-frequency operation, 3.5V–36V input range, and 99% duty cycle dropout capability-designed for high-efficiency power conversion in portable computing and telecom systems.
For engineers reviewing the LTC1628CG-SYNC datasheet, LTC1628CG-SYNC pinout, LTC1628CG-SYNC application, or LTC1628CG-SYNC equivalent, key selection criteria include out-of-phase current-mode control for reduced input capacitance, OPTI-LOOP® compensation for wide output capacitor ESR tolerance, dual 0.8V reference feedback, remote sense capability, and integrated 5V/3.3V standby regulators with PGOOD monitoring.
Technical Context
The LTC1628CG-SYNC implements a constant-frequency current-mode architecture with two channels operating 180° out of phase to minimize RMS input current and EMI. Each channel uses independent ITH error amplifier outputs to control peak inductor current via differential SENSE+/- inputs referenced to a precision 0.8V internal reference.
Its OPTI-LOOP® compensation allows stable transient response across broad ranges of output capacitance and ESR. The device supports three low-power modes-Burst Mode®, forced continuous, and constant frequency-selected via the FCB pin, and includes foldback current limiting, latchable short-circuit shutdown, and output overvoltage protection with bottom-MOSFET latching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports all common battery chemistries and industrial DC rails. |
| Output Voltage Accuracy | ±1% - ensures tight regulation for sensitive microprocessor core and I/O supplies. |
| Switching Frequency | 150kHz to 300kHz (phase-lockable) - enables EMI-controlled layout and predictable filter design. |
| Duty Cycle Max | 99.4% - sustains regulation under very low VIN-to-VOUT ratios (e.g., 5V out from 5.2V input). |
| Feedback Reference | 0.800V ±0.008V - precise, temperature-stable reference compatible with modern low-voltage ICs. |
| PGOOD Threshold | ±7.5% on VOSENSE - provides reliable system power-good signaling for sequenced startup. |
| Shutdown IQ | 20µA - enables ultra-low quiescent power in battery-backed standby states. |
| Operating Temp | 0°C to +85°C - commercial-grade rating suitable for notebook, telecom, and industrial enclosures. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 0.025" pitch, JEDEC MS-012AC compliant. Thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & run control | Capacitor-based ramp controls startup current; also triggers timed latchoff during sustained overcurrent. |
| SENSE1+/SENSE2+, SENSE1−/SENSE2− (Pins 2,3,13,14) | Differential current sense inputs | Measure voltage drop across RSENSE to regulate peak inductor current per channel. |
| VOSENSE1/VOSENSE2 (Pins 4, 12) | Remote feedback inputs | Accept resistive divider output from load point to compensate for PCB trace IR drop. |
| PLLFLTR, PLLIN (Pins 5, 6) | Phase-locked loop interface | Enable synchronization to external clock or DC voltage tuning of oscillator frequency (140–310 kHz). |
| FCB (Pin 7) | Mode select & secondary winding control | Selects Burst Mode®, constant frequency, or forced continuous; used to regulate auxiliary windings. |
| ITH1/ITH2 (Pins 8, 11) | Error amplifier output | Directly sets current limit threshold; also serves as compensation node for OPTI-LOOP® stability. |
| SGND (Pin 9) | Small-signal ground reference | Must be isolated from PGND to prevent noise coupling into feedback and current sense paths. |
| 3.3VOUT (Pin 10) | Integrated linear regulator output | Supplies 10mA DC / 50mA peak for biasing logic or low-noise analog circuitry. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Asserts low if either VOSENSE deviates >±7.5% - used for system enable sequencing. |
| TG1/TG2, BG1/BG2 (Pins 16,27,19,23) | Top/bottom gate drivers | Drive external N-MOSFETs with fast rise/fall times (≤90ns) and 3A peak current capability. |
| VIN, INTVCC, EXTVCC (Pins 24,21,22) | Main, internal, and external supply inputs | INTVCC powered by internal 5V LDO or bypassed via EXTVCC ≥4.7V for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual controllers | Reduces RMS input current by up to 39%, enabling smaller input capacitors and lower EMI without added filtering. |
| OPTI-LOOP® compensation | Allows stable loop response across ceramic, polymer, and electrolytic output capacitors with ESR from 1mΩ to 100mΩ. |
| Dual N-MOSFET synchronous drive | Eliminates Schottky losses; achieves >90% efficiency at 5A loads with proper MOSFET selection (e.g., FDS6680A). |
| Adjustable soft-start & foldback limiting | Prevents inrush damage and limits fault energy during shorts - configurable per channel via RUN/SS and ITH pins. |
| Integrated 5V/3.3V standby regulators | Provides auxiliary bias rails without external LDOs - reduces BOM count and improves system-level power sequencing. |
| Output overvoltage protection | Latches bottom MOSFET on until VOUT returns to safe range - prevents damage to downstream logic during transients. |
Applications
| Notebook Power Management | Telecom DC Distribution |
|---|---|
Use Scenario: Dual-rail CPU and chipset power in thin-and-light notebooks with limited board space and thermal budget. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing independent 5V and 3.3V outputs with coordinated soft-start and PGOOD sequencing. Use Value: 39% lower RMS input current reduces required input capacitance by ~50%, shrinking total solution size and cost while meeting CISPR-22 Class B EMI limits. | Use Scenario: Intermediate bus conversion in 48V telecom systems powering multiple line cards with varying load profiles. IC Role / Device Role / Timing Role: High-efficiency, phase-locked dual controller delivering regulated 5V/3.3V rails with burst-mode operation for light-load efficiency. Use Value: Phase-locking enables synchronized switching across multiple LTC1628CG-SYNC units, minimizing beat frequencies and simplifying system-level EMI filtering. |
| Battery-Powered PDAs | Industrial Embedded Systems |
Use Scenario: Long-runtime handheld devices requiring extended battery life and robust fault handling during hot-swap or cable disconnect events. IC Role / Device Role / Timing Role: Primary DC/DC controller with foldback current limiting, latchable short-circuit shutdown, and 99% dropout for deep-battery operation. Use Value: Foldback limiting maintains safe power dissipation (<1W) during sustained shorts, while 99% duty cycle extends usable battery range down to 3.6V input. | Use Scenario: DIN-rail mounted programmable logic controllers needing reliable, long-lifecycle power with minimal derating over temperature. IC Role / Device Role / Timing Role: Dual-output controller with remote sensing, ±1% accuracy, and 0°C–85°C operation for stable I/O and processor rail generation. Use Value: Remote sense compensates for up to 100mΩ PCB trace resistance, ensuring ±1% regulation at load point despite thermal drift and voltage drop. |
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 | Single-chip dual-phase controller with integrated MOSFET drivers only; no onboard 3.3V LDO or PLLIN sync input. | Lacks dedicated 3.3V linear regulator and external clock synchronization - less suitable for multi-rail sequenced systems. | Choose MP2918GL-Z when board space is critical and auxiliary 3.3V rail is provided externally. |
| TPS546D24RQFT | 60A single-channel PMBus-configurable buck with integrated MOSFETs; not dual-phase or discrete driver-based. | Designed for high-current single-rail applications; lacks dual independent outputs and standalone 3.3V LDO. | Choose TPS546D24RQFT for high-current, digitally controlled single-rail designs where flexibility outweighs discrete driver benefits. |
Compared with MP2918GL-Z and TPS546D24RQFT, the LTC1628CG-SYNC uniquely combines dual independent phase control, integrated 3.3V LDO, PLL synchronization, and discrete gate drive - making it optimal for compact, multi-rail, analog-controlled systems requiring high reliability and low EMI.
Availability
LTC1628CG-SYNC is available at Aetrix Electronics and suitable for notebook computers, telecom DC distribution systems, and battery-powered portable electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC1628CG-SYNC 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.
The LTC1628-SYNC belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for high-efficiency, low-EMI dual-rail DC/DC conversion in space-constrained portable and telecom applications.
FAQ
What is the maximum supported input voltage for the LTC1628CG-SYNC?
The LTC1628CG-SYNC has an absolute maximum input voltage rating of 36V on the VIN pin. Continuous operation is specified from 3.5V to 36V, with undervoltage lockout releasing at 3.5V (typical) and re-engaging at 3.4V (min) during brownout conditions. Exceeding 36V risks permanent damage to internal circuitry and gate drivers.
Does the LTC1628CG-SYNC support remote voltage sensing for both outputs?
Yes, the LTC1628CG-SYNC supports true remote sensing on both outputs via dedicated VOSENSE1 and VOSENSE2 pins. Each accepts a resistive divider directly at the load point, enabling accurate regulation despite PCB trace resistance - critical for maintaining ±1% accuracy under dynamic load conditions.
How does the FCB pin affect operating mode selection in the LTC1628CG-SYNC?
The FCB pin selects among three distinct operating modes: below 0.8V forces continuous conduction mode; between 0.8V and (INTVCC – 2V) enables Burst Mode®; above 4.3V activates constant-frequency operation. This pin also regulates secondary windings when used with coupled inductors - a function unique to the LTC1628CG-SYNC among dual-phase controllers.
Can the LTC1628CG-SYNC synchronize both channels to an external clock source?
Yes, the LTC1628CG-SYNC synchronizes only Channel 1's top gate signal to the external clock applied to PLLIN; Channel 2 automatically operates 180° out of phase. This ensures interleaved operation while maintaining deterministic timing alignment - essential for reducing input ripple and EMI in multi-unit systems.
What thermal derating applies to the LTC1628CG-SYNC at 85°C ambient?
At TA = 85°C, the LTC1628CG-SYNC junction temperature must remain ≤125°C. With θJA = 95°C/W, maximum allowable power dissipation is (125 – 85)/95 ≈ 0.42W. This requires careful layout with thermal vias under the exposed pad (if present) and adequate copper area - especially when delivering 5A per channel at high duty cycles.
LTC1628CG-SYNC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.209", 5.30mm 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):
- 3.5V ~ 30V
- 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:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1628CG-SYNC#PBF FAQ
1.How can I place an order for LTC1628CG-SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628CG-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 LTC1628CG-SYNC#PBF reliable?
The price and inventory of LTC1628CG-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 LTC1628CG-SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LTC1628CG-SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628CG-SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628CG-SYNC#PBF?
LTC1628CG-SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628CG-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 LTC1628CG-SYNC#PBF?
For technical support, including LTC1628CG-SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628CG-SYNC#PBF requirements.
6.How does Aetrix verify that LTC1628CG-SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1628CG-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 LTC1628CG-SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LTC1628CG-SYNC#PBF?
All LTC1628CG-SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628CG-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 LTC1628CG-SYNC#PBF part is unused and in its original packaging.
Return procedure for LTC1628CG-SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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