My Inquiry
My Account
Analog Devices Inc. LTC1629EG-6#TRPBF
- Part No.:
- LTC1629EG-6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1629EG-6#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1629EG-6 from Analog Devices (formerly Linear Technology) is a dual-phase, polyphase synchronous step-down switching regulator controller with 0.6V ±1% reference, current-mode control, and phase-lockable 150–300kHz fixed-frequency operation. It drives external N-channel MOSFETs in high-current DC/DC applications such as desktop computers, internet servers, and large memory arrays, delivering up to 40A output with true remote sensing and power-good monitoring.
For engineers reviewing the LTC1629EG-6 datasheet, LTC1629EG-6 pinout, LTC1629EG-6 application, or LTC1629EG-6 equivalent, key selection considerations include its dual-phase current-sharing capability, 0.6V reference accuracy, 28-pin SSOP package, OPTI-LOOP® compensation for wide ESR/capacitance tolerance, and support for up to 12-phase expansion via CLKOUT synchronization.
Technical Context
The LTC1629EG-6 implements a constant-frequency, current-mode control architecture with two independent PWM channels operating 180° out of phase. Its internal differential amplifier enables true remote sensing across both output terminals, while the RUN/SS pin integrates soft-start ramping and timed short-circuit shutdown.
Phase synchronization is achieved via PLLIN input and programmable PHASMD pin (0°/180°/240° phase offsets), and the oscillator frequency is adjustable from 120kHz to 360kHz using the PLLFLTR pin voltage. The controller supports dropout operation up to 99% duty cycle and includes overvoltage soft-latch, current foldback, and micropower shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 0.600 V ±1% - sets precise output regulation point for high-accuracy supplies |
| Operating Frequency Range | 120–360 kHz - adjustable via PLLFLTR voltage; nominal 190–250 kHz at 1.2V |
| Input Voltage Range | 4 V to 36 V - supports wide industrial and computing rail inputs |
| Duty Cycle Max | 99.5% - enables ultra-low dropout operation near VIN ≈ VOUT |
| Current Sense Threshold | 62–88 mV - defines peak inductor current limit per phase; supports RSENSE-based current programming |
| Power Good Accuracy | ±10% window on EAIN - provides reliable output voltage status indication with 10µs response |
| Thermal Range | –40°C to +85°C - qualified for extended industrial ambient conditions |
| Package | 28-Lead SSOP - surface-mount, thermally enhanced plastic package with 95°C/W θJA |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), exposed pad not electrically connected, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start & run control input | Capacitor-based ramp controls startup current; <0.8V forces shutdown; also serves as short-circuit timeout timer |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense inputs | Connect to high-side of sense resistors; used with SENSE– to set per-phase current limit threshold |
| SENSE1–/SENSE2– (Pins 3,13) | Negative current sense inputs | Return path for sense resistor; referenced to SGND; common-mode range extends to 1.1×INTVCC |
| EAIN (Pin 4) | Error amplifier inverting input | Receives feedback from VDIFFOUT; compared to 0.6V reference to regulate output voltage |
| PLLFLTR (Pin 5) | PLL low-pass filter / frequency control | DC voltage (0–2.4V) sets oscillator frequency; also accepts AC sync signal for PLL locking |
| PLLIN (Pin 6) | External synchronization input | 50kΩ internally pulled to SGND; rising edge aligns TG1 turn-on for multi-controller phase coherence |
| PHASMD (Pin 7) | Phase mode select | GND/Open/INTVCC selects 180°/180°/240° phase offset between controllers and CLKOUT timing |
| ITH (Pin 8) | Error amplifier output & compensation node | 0–2.4V control voltage sets current comparator thresholds; primary loop compensation point |
| SGND (Pin 9) | Signal ground reference | Common return for all analog circuitry; must be isolated from PGND to avoid noise coupling |
| VDIFFOUT (Pin 10) | Differential amplifier output | Unity-gain remote sense output; drives external divider to set VOUT; slew rate 5V/µs |
| VOS+/VOS– (Pins 11,12) | Operational amplifier inputs | Configurable as diff amp or standalone op amp; precision internal resistors enable flexible feedback design |
| PGOOD (Pin 15) | Open-drain power-good indicator | Pulled low when EAIN deviates >±10% from 0.6V; requires external pull-up to ≤7V |
| TG1/TG2 (Pins 16,27) | Top gate drivers | Floating N-channel drivers; swing = INTVCC superimposed on SW node; 5A peak sink/source |
| SW1/SW2 (Pins 17,26) | Switch node connections | Connect to inductor high-side; voltage swings from Schottky drop below GND to VIN |
| BOOST1/BOOST2 (Pins 18,25) | Bootstrap supplies | Capacitors tied between BOOST–SW; diodes from BOOST to INTVCC; swing = INTVCC to VIN+INTVCC |
| BG1/BG2 (Pins 19,23) | Bottom gate drivers | Ground-referenced N-channel drivers; 0–INTVCC swing; optimized for synchronous rectification |
| PGND (Pin 20) | Power ground | Return for bottom FET sources and CIN negative terminals; separate from SGND |
| INTVCC (Pin 21) | Internal 5V LDO output | Supplies drivers and logic; bypassed with 1µF ceramic + ≥4.7µF tantalum; switchover to EXTVCC at 4.7V |
| EXTVCC (Pin 22) | External supply input | Bypasses internal LDO when >4.7V; max 7V; improves efficiency by powering INTVCC from regulated output |
| VIN (Pin 24) | Main input supply | 4–36V input rail; decoupled directly to SGND; powers internal circuits when EXTVCC inactive |
| CLKOUT (Pin 28) | Phase-synchronized clock output | Drives additional LTC1629-6 controllers for 3–12 phase expansion; enables scalable high-current designs |
Key Features
| Feature | Design Value |
|---|---|
| PolyPhase™ dual-phase architecture | 180° interleaved switching reduces RMS input/output ripple current by >70%, enabling smaller capacitors and lower thermal stress |
| True remote sensing differential amplifier | VDIFFOUT delivers unity-gain differential measurement across full output terminals, correcting for PCB IR drop in >20A systems |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitance (10µF–1000µF) and ESR (1mΩ–100mΩ) without redesign |
| Phase-lockable frequency control | PLLIN input and PLLFLTR voltage enable synchronization to external clocks or precise frequency tuning across temperature |
| Integrated power-good monitor | PGOOD asserts within 10µs when output deviates >±10% from target, supporting system-level fault management and sequencing |
| Micropower shutdown & current foldback | 20–40µA shutdown current; foldback limits MOSFET dissipation during overload before latchoff triggers |
Applications
| Desktop Computer VRM | Internet Server Power Supply |
|---|---|
|
Use Scenario: Regulating 3.3V/40A CPU core voltage in high-performance desktop motherboards with tight transient response requirements. IC Role / Device Role / Timing Role: Dual-phase synchronous buck controller managing two parallel power stages with interleaved timing to reduce input ripple and improve thermal distribution. Use Value: Achieves <1% load regulation and <10µs PGOOD assertion, meeting Intel VRM specifications while minimizing input capacitor count and board area. |
Use Scenario: Providing 1.8V/30A auxiliary rail in 1U rack-mounted servers where airflow and thermal density constrain component placement. IC Role / Device Role / Timing Role: PolyPhase controller driving Si7840DP/Si7440DP MOSFET pairs with 180° phase shift to halve RMS input current and reduce hot-spot temperature rise. Use Value: Enables 92% peak efficiency at 20A with 5°C lower MOSFET junction temperature versus single-phase implementation. |
| Large Memory Array Power | DC Power Distribution System |
|
Use Scenario: Supplying 1.2V/25A to DDR4 memory modules in enterprise storage arrays requiring low-noise, high-reliability regulation. IC Role / Device Role / Timing Role: Dual-phase controller with true remote sensing (VDIFFOUT → VOS+/VOS–) compensating for >50mΩ PCB trace resistance between regulator and DIMM slots. Use Value: Maintains ±0.5% output accuracy under full load despite 150mV IR drop, eliminating need for point-of-load regulators. |
Use Scenario: Centralized 5V/50A intermediate bus in industrial automation PLCs where multiple downstream DC/DC converters draw from shared rail. IC Role / Device Role / Timing Role: Base controller in 4-phase daisy-chained configuration (via CLKOUT), scaling total output to 100A with synchronized switching across all phases. Use Value: Reduces required input bulk capacitance by 60% and eliminates input EMI filter resonances through deterministic ripple cancellation. |
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 |
|---|---|---|---|
| MP2940AGQ-10-Z | Single-chip dual-phase controller with integrated MOSFET drivers and PMBus interface; no external PLLIN/CLKOUT for multi-phase expansion | Targeted at space-constrained, digitally managed systems; lacks true remote sensing amplifier and VDIFFOUT output | Select MP2940AGQ-10-Z only if digital telemetry and footprint reduction outweigh need for scalable multi-phase architecture and precision remote sensing. |
| ISL65425IRZ-T | Fixed 300kHz dual-phase controller with 0.6V reference; no PLLFLTR voltage tuning or PHASMD programmability; 32-pin QFN package | Designed for cost-sensitive server VRMs; lacks OPTI-LOOP compensation and EXTVCC switchover capability | Choose ISL65425IRZ-T when fixed-frequency operation and simplified layout are prioritized over frequency flexibility and efficiency optimization at light loads. |
Compared with MP2940AGQ-10-Z and ISL65425IRZ-T, the LTC1629EG-6 uniquely supports scalable 2–12 phase expansion, true differential remote sensing, and adaptive frequency tuning-making it optimal for high-reliability, thermally constrained, or future-proofed high-current analog power designs.
Availability
LTC1629EG-6 is available at Aetrix Electronics and suitable for desktop computers, internet servers, and large memory arrays requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for LTC1629EG-6 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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets.
The LTC1629EG-6 belongs to Linear's PolyPhase™ controller family, engineered specifically for high-current, multi-phase DC/DC conversion in computing and data center infrastructure where thermal management, ripple suppression, and scalability are critical.
FAQ
What is the maximum output current supported by the LTC1629EG-6 in a dual-phase configuration?
The LTC1629EG-6 itself does not deliver current-it controls external MOSFETs. In a dual-phase setup with appropriate silicon (e.g., Si7840DP/Si7440DP) and layout, the LTC1629EG-6 enables up to 40A continuous output. Peak current depends on RSENSE value, inductor selection, thermal design, and input voltage; typical designs achieve 30–40A with <2°C MOSFET temperature rise per phase.
Does the LTC1629EG-6 support remote voltage sensing, and how is it implemented?
Yes, the LTC1629EG-6 supports true remote sensing via its dedicated differential amplifier. VDIFFOUT outputs a buffered, unity-gain representation of the voltage difference between VOS+ and VOS–, which are connected directly to the positive and negative output terminals. This compensates for PCB trace resistance and ensures regulation accuracy at the load, not just at the converter output pads.
Can the LTC1629EG-6 operate in dropout mode, and what is its minimum on-time limitation?
Yes, the LTC1629EG-6 supports very low dropout operation with up to 99.5% duty cycle. Its minimum on-time is 180ns (tested with square wave), enabling stable regulation even when VIN is only slightly above VOUT. A dropout detector actively recharges bootstrap capacitors every 10th cycle to sustain gate drive during extended 100% duty operation.
How does the OPTI-LOOP® compensation in the LTC1629EG-6 simplify design across different output capacitor types?
OPTI-LOOP® compensation in the LTC1629EG-6 dynamically adapts loop stability to varying output capacitance and ESR. Unlike conventional Type-II/III compensators, it allows stable operation with ceramic (low-ESR), polymer (medium-ESR), or tantalum (high-ESR) capacitors-ranging from 10µF to 1000µF-without changing external compensation components, reducing qualification effort and BOM variants.
What is the function of the CLKOUT pin on the LTC1629EG-6, and how many additional controllers can it synchronize?
The CLKOUT pin on the LTC1629EG-6 provides a phase-synchronized clock signal used to daisy-chain additional LTC1629-6 controllers. With proper PHASMD configuration and inter-controller wiring, CLKOUT enables expansion to up to 12 evenly phased controllers-supporting system-level output currents from 15A to 200A while maintaining interleaved timing and ripple cancellation benefits.
LTC1629EG-6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 28-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):
- 4V ~ 36V
- Frequency - Switching:
- 220kHz
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1629EG-6#TRPBF FAQ
1.How can I place an order for LTC1629EG-6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1629EG-6#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 LTC1629EG-6#TRPBF reliable?
The price and inventory of LTC1629EG-6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1629EG-6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1629EG-6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1629EG-6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1629EG-6#TRPBF?
LTC1629EG-6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1629EG-6#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 LTC1629EG-6#TRPBF?
For technical support, including LTC1629EG-6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1629EG-6#TRPBF requirements.
6.How does Aetrix verify that LTC1629EG-6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1629EG-6#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 LTC1629EG-6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1629EG-6#TRPBF?
All LTC1629EG-6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1629EG-6#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 LTC1629EG-6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1629EG-6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1629EG-6#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…
