My Inquiry
My Account
Analog Devices Inc. LTC1628IG-SYNC#TRPBF
- Part No.:
- LTC1628IG-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1628IG-SYNC#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,715
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1628IG-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, 99% duty cycle dropout capability, and integrated 5V/3.3V standby regulators - used in notebook computers, telecom power systems, and battery-powered digital devices.
For engineers reviewing the LTC1628IG-SYNC datasheet, LTC1628IG-SYNC pinout, LTC1628IG-SYNC application, or LTC1628IG-SYNC equivalent, key selection criteria include dual-phase interleaving for reduced input ripple, OPTI-LOOP® compensation for wide output capacitor compatibility, out-of-phase timing to minimize EMI, and robust protection features including foldback current limiting, latchable short-circuit shutdown, and output overvoltage protection.
Technical Context
The LTC1628IG-SYNC implements a constant-frequency current-mode architecture with two 180° out-of-phase control loops, each using an internal 0.8V reference and transconductance error amplifier (gm = 1.3 mmho, GBW = 3 MHz). Phase synchronization is achieved via PLLIN/PLLFLTR pins, enabling frequency locking from 120kHz to 360kHz depending on PLLFLTR voltage.
It integrates dual gate drivers (TG1/TG2, BG1/BG2) with <90ns rise/fall times, supports remote sensing (VOSENSE1/VOSENSE2), and provides independent RUN/SS pins for soft-start ramping and timed short-circuit detection. The IC also includes dedicated 3.3V linear regulator (±1% load regulation), INTVCC/EXTVCC power management, and PGOOD open-drain output monitoring both channels against ±7.5% trip threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide battery chemistries and industrial DC rails without external pre-regulation. |
| Output Accuracy | ±1% over temperature - ensures stable microprocessor core and I/O rail compliance across –40°C to 85°C. |
| Switching Frequency | 150kHz–300kHz (phase-lockable) - enables EMI-controlled layout and predictable filter design. |
| Duty Cycle Max | 99.4% - allows ultra-low dropout operation near VIN ≈ VOUT, critical for battery end-of-life scenarios. |
| PGOOD Threshold | ±7.5% on VOSENSE - provides reliable system-level power sequencing and fault reporting for host controllers. |
| Shutdown IQ | 20µA - minimizes quiescent drain in always-on subsystems like real-time clocks or wake-up logic. |
| 3.3V LDO Output | 3.25V–3.45V at 10mA - powers auxiliary circuitry (e.g., PMIC bias, sensor interfaces) without external regulators. |
Pinout & Package
28-Lead Plastic SSOP (G package), 5.6mm × 10.2mm body, 0.635mm pitch, exposed pad not electrically connected. Thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS1, RUN/SS2 (Pins 1, 15) | Soft-start & short-circuit timer input | Capacitor-based ramp controls inrush; falling below 1.0V disables respective channel; latches off after sustained overcurrent. |
| SENSE1+/SENSE1–, SENSE2+/SENSE2– (Pins 2,3,13,14) | Differential current sense inputs | Measure RSENSE voltage drop to set peak current limit; total source current ≤ –60µA per pair. |
| VOSENSE1, VOSENSE2 (Pins 4, 12) | Remote feedback voltage input | Accepts resistive divider output; regulates to 0.800V ±0.8%; trip threshold ±7.5% for PGOOD assertion. |
| PLLIN, PLLFLTR (Pins 6, 5) | Phase-locked loop interface | PLLIN accepts external sync edge; PLLFLTR sets oscillator frequency (120–360kHz) or receives sync-derived DC control. |
| FCB (Pin 7) | Forced continuous/burst mode select | Pull <0.8V for forced PWM; 0.8–2.7V enables Burst Mode®; >4.3V inhibits burst (constant frequency). |
| TG1/TG2, BG1/BG2 (Pins 16,27,19,23) | N-channel MOSFET gate drivers | TG drives high-side FETs with floating bootstrap supply; BG drives low-side FETs referenced to PGND; <90ns transitions. |
| INTVCC (Pin 21) | Internal 5V LDO output | Powers control logic and drivers; regulated to 4.8–5.2V; requires ≥4.7µF low-ESR decoupling to PGND. |
| 3.3VOUT (Pin 10) | Dedicated linear regulator output | Supplies up to 10mA DC / 50mA peak; line/load regulation ≤2%; leakage ≤50µA in shutdown. |
| PGOOD (Pin 28) | Open-drain power-good indicator | Pulled low if either VOSENSE deviates >±7.5%; releases within 10µs when both outputs are in regulation. |
Key Features
| Feature | Design Value |
|---|---|
| 2-Phase Interleaved Operation | Reduces RMS input current by ~39% vs single-phase (e.g., 2.53A → 1.55A), lowering input capacitor cost, EMI, and power loss (I²R reduction factor 2.66). |
| OPTI-LOOP® Compensation | Enables stable transient response across wide range of ceramic and polymer output capacitors (COUT) and ESR values without external tuning. |
| Dual Independent Control Loops | Each channel has dedicated ITH, RUN/SS, SENSE, and VOSENSE pins - supports asymmetric outputs (e.g., 5V@5A + 3.3V@5A) with separate soft-start and fault handling. |
| Integrated Standby Regulators | On-chip 5V LDO (INTVCC) and 3.3V LDO (3.3VOUT) eliminate need for external bias supplies in multi-rail systems. |
| Robust Protection Suite | Includes foldback current limiting, latchable short-circuit shutdown (defeatable), output overvoltage lockout (0.84–0.88V), and undervoltage lockout (3.5–4.0V). |
Applications
| High-Efficiency Notebook Power | Telecom DC Distribution |
|---|---|
Use Scenario: Dual-rail CPU/I/O power delivery in space-constrained ultraportable notebooks with Li-ion battery input (7V–20V). IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing 5V core and 3.3V I/O rails with interleaved switching to reduce input ripple and thermal stress. Use Value: Enables smaller input capacitors (22µF ceramic instead of 100µF tantalum), extends battery runtime via 95% peak efficiency, and meets CISPR-22 conducted EMI limits. | Use Scenario: Centralized 48V-to-5V/3.3V conversion in telecom line cards requiring high reliability and low noise. IC Role / Device Role / Timing Role: Primary controller for redundant dual-output DC/DC stage; uses PLLIN to synchronize to system clock and avoid beat frequencies. Use Value: Achieves <10mVpp output ripple under dynamic load, supports hot-swap sequencing via PGOOD, and maintains regulation during 48V brownout down to 3.5V input. |
| Battery-Powered PDAs | Industrial Embedded Systems |
Use Scenario: Power management in handheld PDAs with dual Li-poly batteries (6V–12.6V) powering ARM processor and display backlight. IC Role / Device Role / Timing Role: Generates clean 5V (for USB PHY) and 3.3V (for MCU/SRAM) with Burst Mode® operation to extend standby time. Use Value: Delivers 20µA shutdown IQ and <100µA light-load IQ, enabling >30-day shelf life; remote sensing compensates for PCB trace IR drop. | Use Scenario: Field-deployable IoT gateway requiring wide-input (12V–36V automotive/industrial bus) and dual isolated rails. IC Role / Device Role / Timing Role: Main DC/DC controller with EXTVCC powered from 5V output, reducing thermal load; uses RUN/SS latching for fault containment. Use Value: Supports –40°C to 85°C operation (LTC1628IG-SYNC grade), withstands 36V transients, and provides PGOOD-driven watchdog reset on rail failure. |
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 |
|---|---|---|---|
| LTC3727-1 | Single-channel, 2-phase capable (requires external clock sync); no integrated 3.3V LDO; higher max fSW (600kHz). | Requires external components for dual-rail generation; better suited for high-frequency, high-density designs where footprint is constrained. | Select LTC3727-1 when needing >300kHz operation or tighter layout control; LTC1628IG-SYNC preferred for integrated standby rails and simpler BOM. |
| MP8765GL-Z | Dual-channel, non-interleaved; no PLL sync; lower IQ (15µA shutdown); no remote sensing or PGOOD. | Lacks phase interleaving and protection features; suitable only for cost-sensitive, non-critical consumer applications. | Choose MP8765GL-Z for basic dual-buck needs without EMI or reliability requirements; LTC1628IG-SYNC remains superior for industrial/telecom use cases. |
Compared with LTC3727-1 and MP8765GL-Z, the LTC1628IG-SYNC uniquely combines dual independent 2-phase control, integrated 3.3V/5V bias rails, full protection suite, and –40°C to 85°C guaranteed operation - making it the only option supporting high-reliability, multi-rail, thermally constrained portable and telecom systems without external support ICs.
Availability
LTC1628IG-SYNC is available at Aetrix Electronics and suitable for notebook computing, telecom power distribution, and battery-operated digital devices requiring stable component supply, extended temperature performance, and long-term lifecycle continuity.
Supply support for LTC1628IG-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) acquired Linear Technology in 2017 and continues its legacy of high-performance analog, power management, and mixed-signal ICs for demanding applications.
The LTC1628IG-SYNC belongs to Linear's precision switching controller product line, designed specifically for high-efficiency, multi-rail, thermally constrained portable and infrastructure power systems requiring phase interleaving, robust protection, and wide-input operation.
FAQ
What is the operating temperature range for the LTC1628IG-SYNC?
The LTC1628IG-SYNC is specified for –40°C to +85°C junction temperature operation, validated across the full range for all electrical parameters including output accuracy (±1%), PGOOD trip level (±7.5%), and UVLO (3.5V min). This makes it suitable for automotive cabin, industrial, and outdoor portable applications where ambient extremes are expected.
Does the LTC1628IG-SYNC support true dual independent outputs?
Yes, the LTC1628IG-SYNC provides two fully independent synchronous buck controllers - each with dedicated RUN/SS, ITH, SENSE+, SENSE–, VOSENSE, and gate drive pins (TG1/BG1 and TG2/BG2). This enables asymmetric configurations (e.g., 5V@5A + 3.3V@3A), separate soft-start timing, and independent fault responses without cross-talk.
How does the OPTI-LOOP® compensation in the LTC1628IG-SYNC improve design flexibility?
OPTI-LOOP® compensation in the LTC1628IG-SYNC dynamically adjusts loop gain based on output capacitor ESR and value, allowing stable operation with ceramic, polymer, or hybrid COUT ranging from 10µF to 220µF without external compensation components. This eliminates trial-and-error tuning and supports rapid prototyping across diverse output filter implementations.
Can the LTC1628IG-SYNC be synchronized to an external clock source?
Yes, the LTC1628IG-SYNC supports external synchronization via the PLLIN pin, which accepts TTL/CMOS-compatible clock edges. The internal phase-locked loop aligns the rising edge of TG1 to the PLLIN signal, enabling deterministic timing across multiple converters and eliminating beat frequencies in multi-rail systems.
What protection features are built into the LTC1628IG-SYNC?
The LTC1628IG-SYNC includes foldback current limiting, latchable short-circuit shutdown (with defeat option), output overvoltage lockout (0.84–0.88V), undervoltage lockout (3.5–4.0V), thermal shutdown (125°C), and PGOOD monitoring of both outputs. These features ensure safe operation during faults while maintaining system visibility through the open-drain PGOOD pin.
LTC1628IG-SYNC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.209", 5.30mm 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):
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1628IG-SYNC#TRPBF FAQ
1.How can I place an order for LTC1628IG-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1628IG-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 LTC1628IG-SYNC#TRPBF reliable?
The price and inventory of LTC1628IG-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 LTC1628IG-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1628IG-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1628IG-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1628IG-SYNC#TRPBF?
LTC1628IG-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1628IG-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 LTC1628IG-SYNC#TRPBF?
For technical support, including LTC1628IG-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1628IG-SYNC#TRPBF requirements.
6.How does Aetrix verify that LTC1628IG-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1628IG-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 LTC1628IG-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1628IG-SYNC#TRPBF?
All LTC1628IG-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1628IG-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 LTC1628IG-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LTC1628IG-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1628IG-SYNC#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
