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Analog Devices Inc. LTC3829IFE#WTRPBF
- Part No.:
- LTC3829IFE#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3829IFE#WTRPBF.pdf
- Description:
- 3-PHASE, 1X OUT SYNC BUCK DC/DC
- Quantity:
- Payment:
- Shipping:
Inventory:4,368
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Product details
Overview
LTC3829IFE#WTRPBF from Analog Devices is a 3-phase, single-output synchronous step-down DC/DC controller driving triple N-channel MOSFET stages with differential remote sensing, phase-lockable 250–770 kHz operation, 0.6 V reference accuracy (±0.75%), and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the LTC3829IFE#WTRPBF datasheet, LTC3829IFE#WTRPBF pinout, LTC3829IFE#WTRPBF application, or LTC3829IFE#WTRPBF equivalent, key selection criteria include DCR temperature compensation, programmable active voltage positioning (AVP), stage shedding vs. Burst Mode trade-offs, and FE-package thermal performance (θJA = 25°C/W).
Technical Context
The LTC3829IFE#WTRPBF implements constant-frequency current-mode control with three independent PWM channels synchronized in 120° phase offset to minimize input capacitor RMS current and EMI. Its differential amplifier (gain = 0.997–1.003 V/V, PSRR = 100 dB) enables true point-of-load regulation across up to 3.3 V output with remote sense.
It supports 6-phase expansion via CLKOUT/PLLIN, provides nonlinear fast-transient response via IFAST pin (9–11 µA threshold), and integrates precision functions including ±0.75% 0.6 V reference, programmable current foldback, and AVP slope control using external resistor between AVP and DIFFP pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 38 V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
| Output Voltage Range | 0.6 V to 3.3 V with diffamp - enables precise low-voltage CPU/GPU core rail regulation at point of load. |
| Reference Accuracy | ±0.75% at 0.6 V - ensures tight output regulation over –40°C to 125°C junction temperature range. |
| Switching Frequency | 250 kHz to 770 kHz, phase-lockable - allows EMI shaping, multi-phase synchronization, and optimized efficiency vs. size trade-off. |
| Package Thermal Resistance | θJA = 25°C/W (FE package) - delivers higher power density than QFN variant under same PCB layout conditions. |
| Current Sensing | RSENSE or DCR with programmable tempco - eliminates need for sense resistors in high-current inductor designs. |
| Control Modes | PWM, Stage Shedding™, or Burst Mode® - selectable via MODE pin to optimize light-load efficiency without compromising transient response. |
Pinout & Package
38-lead plastic TSSOP (FE package) with exposed pad (Pin 39 = SGND/PGND), rated for –40°C to 125°C operating junction temperature. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIFFN (Pin 1) | Negative input of remote-sense differential amplifier | Must connect directly to remote load ground; defines common-mode rejection baseline for diffamp operation. |
| DIFFP (Pin 2) | Positive input of remote-sense differential amplifier | Must connect directly to remote load positive terminal-even when diffamp unused-to maintain signal integrity. |
| RUN (Pin 3) | Enable/disable control input | 1.22 V threshold with 100 mV hysteresis; internal 1.0 µA pull-up enables simple RC soft-start sequencing. |
| AVP (Pin 4) | Active Voltage Positioning slope programming | Resistor to DIFFP sets load-line droop; only functional when diffamp is enabled for dynamic IR compensation. |
| SENSE1+/SENSE1– (Pins 5/6) | Phase 1 current sense comparator inputs | Accepts DCR network or RSENSE; supports programmable max threshold (23–84 mV) via ILIM pin configuration. |
| TK/SS (Pin 11) | Soft-start and tracking control | Internal 1.25 µA current charges external capacitor; enables linear VOUT ramp or master-slave supply tracking. |
| FREQ (Pin 12) | Oscillator frequency programming | 10 µA current source; resistor to ground sets fOSC from 250 kHz to 770 kHz with ±10% tolerance. |
| VFB (Pin 15) | Error amplifier feedback input | Receives scaled output voltage from resistive divider; compared to 0.6 V reference to regulate output. |
| ITH (Pin 16) | Error amplifier output / current limit threshold | Directly controls peak inductor current per phase; used for loop compensation and current foldback. |
| ISET (Pin 17) | Stage shedding & Burst Mode threshold | Resistor to ground programs transition point between 3-phase → 1-phase or burst activation (6.5–8.5 µA). |
| ILIM (Pin 18) | Current sense threshold range select | SGND/FLOAT/INTVCC selects one of three max sense voltages (23–84 mV) per channel for overcurrent protection. |
| PGOOD (Pin 19) | Open-drain power-good indicator | Asserts after 100 µs delay when VFB stays within ±10% of target; requires external pull-up for logic-level signaling. |
| PLLIN (Pin 20) | External clock synchronization input | Accepts TTL/CMOS clock to lock internal oscillator; enables deterministic multi-controller timing alignment. |
| EXTVCC (Pin 25) | External bias supply input | Bypasses internal LDO when >4.7 V applied; reduces power loss and heat generation in high-current applications. |
| INTVCC (Pin 26) | Internal 5 V regulator output | Supplies gate drivers and analog circuitry; requires ≥4.7 µF low-ESR capacitor to PGND for stability. |
| VIN (Pin 27) | Main input supply | Primary power path for controller and top-gate drivers; decoupling capacitor required for high di/dt switching noise suppression. |
| BG1/BG2/BG3 (Pins 32/31/24) | Bottom gate driver outputs | Drive N-MOSFET sources to PGND; 1.1 Ω RDS(ON) pull-down ensures fast turn-off and shoot-through prevention. |
| SW1/SW2/SW3 (Pins 33/30/23) | Switch node connections | Connect to inductor high-side terminals; swing from ~–0.3 V (Schottky drop) to VIN during operation. |
| TG1/TG2/TG3 (Pins 34/29/22) | Top gate driver outputs | Floating drivers with INTVCC-referenced swing; require bootstrap capacitors tied to BOOSTn pins. |
| BOOST1/BOOST2/BOOST3 (Pins 35/28/21) | Bootstrap capacitor supply terminals | Charge path for top-gate drivers; swing from ~INTVCC–0.3 V to VIN+INTVCC during switching cycles. |
| CLKOUT (Pin 36) | Phase-locked clock output | 60° out-of-phase with Channel 1 in 3-phase mode; 180° out-of-phase during stage shedding for 6-phase expansion. |
| MODE (Pin 37) | Operating mode select | SGND = forced continuous; FLOAT = Burst Mode; INTVCC = Stage Shedding - configures light-load behavior. |
| IFAST (Pin 38) | Nonlinear fast-transient trip threshold | Resistor to ground sets threshold for immediate high-bandwidth response to large load steps (9–11 µA typical). |
| ITEMP (Pin 1) | DCR temperature compensation input | Connects to NTC thermistor near inductor; enables real-time DCR resistance correction for accurate current sensing. |
| DIFFOUT (Pin 2) | Differential amplifier output | Drives VFB through external resistor divider; maximum output current = 3 mA, slew rate = 2 V/µs. |
| SGND/PGND (Exposed Pad) | Combined signal & power ground | Must be soldered to PCB ground plane; serves as Kelvin return for all small-signal references and power paths. |
Key Features
| Feature | Design Value |
|---|---|
| Triple N-channel MOSFET synchronous drive | Enables high-efficiency, high-current buck conversion without external P-channel or driver ICs. |
| True remote sense differential amplifier | Compensates for PCB trace IR drop up to 3.3 V output, maintaining ±0.75% regulation at point-of-load. |
| Programmable DCR temperature compensation | Corrects copper winding resistance drift with temperature, preserving current-sense accuracy across –40°C to 125°C. |
| Active Voltage Positioning (AVP) | Provides programmable load-line droop to improve transient response and system stability in VRM applications. |
| Phase-lockable 250–770 kHz oscillator | Allows EMI reduction via spread-spectrum sync and deterministic interleaving across multiple controllers. |
| AEC-Q100 qualified (Grade I) | Validated for automotive under-hood environments with guaranteed –40°C to 125°C operation and robust reliability testing. |
Applications
| Server CPU Core Power | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Delivering tightly regulated 1.0–1.2 V @ 50 A to high-performance server CPUs with rapid load transients up to 75 A/µs. IC Role / Device Role / Timing Role: Primary 3-phase synchronous buck controller managing power delivery, current sharing, and dynamic voltage scaling. Use Value: Differential remote sensing maintains ±0.75% output accuracy at CPU die; stage shedding reduces quiescent current below 5 A while preserving fast transient recovery. | Use Scenario: Supplying 1.8 V @ 20 A to radar/SoC subsystems in autonomous driving ECUs with strict automotive qualification requirements. IC Role / Device Role / Timing Role: AEC-Q100-qualified 3-phase controller providing fault-tolerant, thermally robust power conversion in vibration-prone environments. Use Value: DCR temperature compensation ensures consistent current limiting across under-hood temperature swings; EXTVCC support lowers thermal load during sustained high-power operation. |
| Telecom Base Station RF Power Amplifier | Industrial PLC I/O Module |
Use Scenario: Generating 3.3 V @ 30 A for GaN-based RF power amplifiers requiring ultra-low noise and high PSRR. IC Role / Device Role / Timing Role: Low-noise, phase-interleaved buck controller minimizing input ripple and conducted EMI into sensitive RF front-ends. Use Value: 120° phase offset cuts input capacitor RMS current by >50%; differential amplifier rejects board-level noise coupling to feedback path. | Use Scenario: Providing isolated 2.5 V @ 15 A for FPGA and ADC power domains in modular industrial controllers with long-term field deployment. IC Role / Device Role / Timing Role: High-reliability, thermally efficient controller supporting extended lifetime and maintenance-free operation in harsh factory environments. Use Value: FE package's 25°C/W θJA enables full 15 A output without heatsink; programmable UVLO and PGOOD simplify system-level power sequencing and fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3883IUHF#TRPBF | 4-phase, digital PMBus interface, integrated MOSFET drivers, no diffamp, 0.5 V ref | Requires digital control infrastructure; lacks remote sensing; better for firmware-configurable systems | Select when digital telemetry, margining, and fault logging are required over analog simplicity and point-of-load accuracy. |
| MP2960AGQ-PR | 3-phase, analog controller, no diffamp, no AVP, 0.6 V ref, lower max fSW (600 kHz), QFN-only | Lower cost; no remote sense or active droop; limited thermal performance (θJA ≈ 34°C/W) | Select for cost-sensitive telecom or computing applications where board space permits larger input caps and local sensing suffices. |
Compared with LTC3829IFE#WTRPBF, LTC3883IUHF#TRPBF adds digital configurability but removes differential sensing critical for CPU core rails, while MP2960AGQ-PR offers lower BOM cost but sacrifices thermal efficiency and point-of-load regulation fidelity in automotive or high-density designs.
Availability
LTC3829IFE#WTRPBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, telecom base station RF power supplies, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 compliance, and high-current 3-phase regulation.
Supply support for LTC3829IFE#WTRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3829 belongs to Analog Devices' Power by Linear™ multiphase controller family, engineered for high-efficiency, high-current DC/DC conversion in space-constrained, thermally demanding applications such as CPU/GPU VRMs and automotive power systems.
FAQ
What is the maximum output current capability of the LTC3829IFE#WTRPBF?
The LTC3829IFE#WTRPBF itself does not deliver current-it drives external N-channel MOSFETs. With appropriate FET selection, heatsinking, and layout, it supports >50 A continuous output in 3-phase configurations. Peak transient capability reaches 75 A/µs in nonlinear fast-transient mode, as verified in typical application circuits with 0.6 µH inductors and 0.002 Ω sense resistors.
Does the LTC3829IFE#WTRPBF support remote voltage sensing, and how is it implemented?
Yes, the LTC3829IFE#WTRPBF supports true remote voltage sensing via an integrated differential amplifier. Pins DIFFP and DIFFN connect directly to the load's positive and ground terminals; DIFFOUT feeds the error amplifier's VFB pin through a resistor divider. This architecture rejects PCB trace IR drop and maintains ±0.75% regulation accuracy at the point of load, even with 3.3 V output.
How does the LTC3829IFE#WTRPBF handle thermal management in the FE package?
The LTC3829IFE#WTRPBF uses a 38-lead TSSOP (FE) package with θJA = 25°C/W-significantly lower than the QFN variant's 34°C/W. Its exposed pad (Pin 39) must be soldered to a solid PCB ground plane for optimal conduction cooling. Combined with EXTVCC support (bypassing the internal LDO), this enables full-rated operation at 125°C junction temperature without external heatsinks in properly designed layouts.
Can the LTC3829IFE#WTRPBF be synchronized to an external clock, and what is the required signal format?
Yes, the LTC3829IFE#WTRPBF accepts external synchronization on the PLLIN pin (Pin 20). It supports TTL- or CMOS-level square waves from 250 kHz to 770 kHz. The internal oscillator locks to the external clock with minimal jitter, enabling deterministic phase alignment across multiple controllers in multi-rail systems or EMI-critical applications.
What are the key differences between Burst Mode®, Stage Shedding™, and forced continuous conduction modes on the LTC3829IFE#WTRPBF?
Burst Mode® (MODE = float) disables switching during light loads to maximize efficiency but increases output ripple. Stage Shedding™ (MODE = INTVCC) turns off Phases 2 and 3 while boosting Phase 1 gain-retaining low ripple and fast transient response down to ~5 A. Forced continuous mode (MODE = SGND) maintains switching at all loads, optimizing ripple and noise at the expense of light-load efficiency. All three are selected solely by the MODE pin voltage.
LTC3829IFE#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 3
- Output Phases:
- 3
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 250kHz ~ 770kHz
- Duty Cycle (Max):
- 94%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3829IFE#WTRPBF FAQ
1.How can I place an order for LTC3829IFE#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3829IFE#WTRPBF 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 LTC3829IFE#WTRPBF reliable?
The price and inventory of LTC3829IFE#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3829IFE#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC3829IFE#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3829IFE#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3829IFE#WTRPBF?
LTC3829IFE#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3829IFE#WTRPBF 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 LTC3829IFE#WTRPBF?
For technical support, including LTC3829IFE#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3829IFE#WTRPBF requirements.
6.How does Aetrix verify that LTC3829IFE#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3829IFE#WTRPBF 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 LTC3829IFE#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC3829IFE#WTRPBF?
All LTC3829IFE#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3829IFE#WTRPBF, 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 LTC3829IFE#WTRPBF part is unused and in its original packaging.
Return procedure for LTC3829IFE#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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