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Analog Devices Inc. LTC1929CG#TRPBF
- Part No.:
- LTC1929CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1929CG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
LTC1929CG#TRPBF from Analog Devices (formerly Linear Technology) is a 2-phase, synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode architecture. It delivers up to 40A output at 1.6V with ±1% voltage accuracy, 150–300kHz phase-lockable switching, and true remote differential sensing for high-current server and desktop power rails.
For engineers reviewing the LTC1929CG#TRPBF datasheet, LTC1929CG#TRPBF pinout, LTC1929CG#TRPBF application, or LTC1929CG#TRPBF equivalent, this controller enables high-efficiency, low-noise, multi-phase DC/DC conversion with integrated OPTI-LOOP compensation, foldback current limiting, and soft-start timing control - critical for stable high-current CPU/GPU core supplies.
Technical Context
The LTC1929CG#TRPBF implements dual-channel current-mode control with out-of-phase 180° operation, reducing input/output RMS ripple by effectively doubling the fundamental frequency. Its internal differential amplifier supports true remote sensing across both VOUT+ and VOUT− terminals, enabling precise regulation under high-current PCB trace losses.
Phase synchronization via PLLIN and frequency tuning via PLLFLTR allow system-level clock alignment and dynamic frequency scaling between 140kHz and 310kHz. The RUN/SS pin integrates soft-start ramping, short-circuit latchoff with defeat option, and overvoltage soft-latch - all without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | 2-phase, single-output synchronous buck controller - enables parallel channel current sharing and ripple cancellation |
| Switching Frequency Range | 140–310 kHz - adjustable via PLLFLTR voltage; supports phase-locking to external clock on PLLIN |
| Input Voltage Range | 4V to 36V - accommodates wide-range industrial and server DC bus inputs |
| Output Voltage Accuracy | ±1% over temperature - ensures tight regulation for CPU/GPU core voltage domains |
| Current Sense Threshold | 75 mV typical - sets peak inductor current; supports RSENSE-based current limit calibration |
| Duty Cycle Capability | Up to 99.5% - enables very low dropout operation near VIN ≈ VOUT |
| Remote Sensing | Differential amplifier with 1V/V gain and 55 dB CMRR - rejects common-mode noise in high-current PCB layouts |
Pinout & Package
Package: 28-lead plastic SSOP (G package), RoHS-compliant, thermal resistance θJA = 95°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN/SS (Pin 1) | Soft-start & fault detection input | Charges external capacitor to control startup ramp; triggers latched shutdown if output drops below 70% nominal |
| SENSE1+/SENSE2+ (Pins 2,14) | Positive current sense inputs | Connect to high-side of external RSENSE; set current limit threshold with SENSE– pins |
| SENSE1–/SENSE2– (Pins 3,13) | Negative current sense inputs | Return path for current sense differential pair; referenced to SGND |
| EAIN (Pin 4) | Error amplifier feedback input | Compares regulated output voltage (via resistive divider) against 0.8V internal reference |
| ITH (Pin 8) | Error amplifier output & compensation node | Controls peak inductor current per phase; voltage range 0–2.4V defines PWM duty cycle |
| VDIFFOUT (Pin 10) | Differential amplifier output | Provides remote-sensed output voltage signal referenced to SGND for EAIN feedback |
| TG1/TG2 (Pins 16,27) | Top gate drivers | Floating N-channel MOSFET drivers with bootstrap supply (BOOST1/2); swing = INTVCC + SW node |
| BG1/BG2 (Pins 19,23) | Bottom gate drivers | GND-referenced N-channel drivers; swing = 0V to INTVCC (5V) |
| INTVCC (Pin 21) | Internal 5V LDO output | Power source for logic and gate drivers; switchover to EXTVCC > 4.7V improves efficiency |
| VIN (Pin 24) | Main input supply | Primary power rail (4–36V); powers internal circuitry and provides bootstrap recharge path |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output RMS ripple by ~70%, cutting required input capacitance and ESR by factor of 4 |
| OPTI-LOOP™ compensation | Enables stable transient response across wide range of output capacitor values and ESR without redesign |
| True remote differential sensing | Compensates for IR drop across high-current PCB traces or connectors - essential for ±1% regulation at 40A |
| Phase-lockable oscillator | Allows synchronization to system clock or other regulators to eliminate beat frequencies and EMI peaks |
| Integrated short-circuit protection | Timed latchoff with defeatable mode via RUN/SS current injection - prevents nuisance trips during load transients |
Applications
| Desktop CPU Core Supply | Network Server VRM |
|---|---|
Use Scenario: High-current, low-voltage power delivery to Intel/AMD processors requiring fast load-step response and <1% voltage deviation. IC Role / Device Role / Timing Role: Dual-phase controller managing two synchronous buck stages with 180° phase offset and shared ITH loop. Use Value: Achieves 40A at 1.6V with <5mV load regulation error and <20µs recovery from 0→20A step - enabled by current-mode control and remote sensing. |
Use Scenario: Redundant, high-efficiency 12V-to-1.8V conversion for multi-core Xeon processors in rack-mounted servers. IC Role / Device Role / Timing Role: Primary 2-phase controller coordinating with secondary controllers via PLLIN for system-wide clock alignment. Use Value: Cuts input capacitor RMS current by 75%, allowing smaller, lower-cost ceramic input banks while maintaining <10mV output ripple. |
| Large Memory Array Power | Industrial DC Power Distribution |
Use Scenario: Stable 1.2V/30A supply for DDR4/DDR5 memory modules with strict voltage tolerance and thermal constraints. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller with foldback current limiting to protect against memory bus shorts. Use Value: Maintains regulation during 100A/s load steps using OPTI-LOOP compensation and 2-phase ripple cancellation - no external compensation needed. |
Use Scenario: Robust 24V-to-3.3V/5V conversion in programmable logic controllers with wide input variation and high reliability demands. IC Role / Device Role / Timing Role: Industrial-grade controller operating from –40°C to 85°C ambient, leveraging undervoltage lockout and thermal shutdown. Use Value: Delivers 95% peak efficiency at full load with 99.5% max duty cycle - sustains output during brownout conditions down to VIN = 3.5V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3829EUH#PBF | Higher integration: includes 5V bias supply, enhanced PGOOD accuracy (±0.5%), wider frequency range (50kHz–900kHz) | Supports higher VIN (up to 60V) and adds digital interface options; requires different compensation network | Preferred for new designs needing extended input range or digital monitoring; not pin-compatible |
| MP8765GL-Z | Single-chip 2-phase controller with integrated MOSFET drivers only; no external RSENSE support - uses DCR sensing | Lacks true remote differential sensing and PLL synchronization; optimized for cost-sensitive telecom power | Suitable for space-constrained boards where layout simplicity outweighs precision sensing needs |
Compared with LTC1929CG#TRPBF, LTC3829EUH#PBF offers broader frequency agility and tighter PGOOD tolerance but requires PCB redesign, while MP8765GL-Z reduces BOM count at the expense of remote sensing fidelity and phase-lock capability - making LTC1929CG#TRPBF optimal for high-accuracy, high-current server and desktop VRMs.
Availability
LTC1929CG#TRPBF is available at Aetrix Electronics and suitable for desktop computing, network server power delivery, and industrial DC distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1929CG#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC1929CG#TRPBF belongs to Linear's PolyPhase® controller family, designed specifically for high-current, low-voltage DC/DC conversion in computing and communications infrastructure where efficiency, thermal performance, and ripple suppression are critical.
FAQ
What is the maximum output current supported by the LTC1929CG#TRPBF?
The LTC1929CG#TRPBF is a controller - not a complete regulator - so maximum output current depends on external MOSFET selection, inductor sizing, and thermal design. In the reference design (Figure 1), it delivers 40A at 1.6V using 1µH inductors and appropriate N-channel MOSFETs. Peak current per phase is limited by the 75mV current sense threshold and RSENSE value; the LTC1929CG#TRPBF itself does not impose a hard current ceiling beyond its gate drive capability (3A peak per TG/BG pin).
Does the LTC1929CG#TRPBF include a power good (PGOOD) signal?
No - the LTC1929CG#TRPBF does not include PGOOD functionality. That feature is exclusive to the LTC1929CG-PG variant (e.g., LTC1929CG-PG#TRPBF). The LTC1929CG#TRPBF lacks the PGOOD open-drain output pin (Pin 15) and associated overvoltage/undervoltage monitoring circuitry. For PGOOD capability, the LTC1929CG-PG#TRPBF must be selected instead.
How does the OPTI-LOOP™ compensation work in the LTC1929CG#TRPBF?
OPTI-LOOP™ in the LTC1929CG#TRPBF is an adaptive compensation architecture that adjusts loop gain based on output capacitor ESR and capacitance. It uses the ITH pin voltage and internal transconductance amplifier characteristics to maintain stability across diverse output filter configurations - eliminating the need for manual compensation network changes when using ceramic, polymer, or tantalum capacitors. This allows the LTC1929CG#TRPBF to retain fast transient response even with low-ESR ceramic outputs.
Can the LTC1929CG#TRPBF operate in dropout mode?
Yes - the LTC1929CG#TRPBF supports very low dropout operation with up to 99.5% duty cycle. When VIN approaches VOUT, its internal dropout detector forces brief top-FET off-times (~400ns every 10th cycle) to recharge the bootstrap capacitor, sustaining gate drive integrity. This enables regulation down to VIN − VOUT ≈ 0.3V, making the LTC1929CG#TRPBF suitable for brownout conditions in 12V or 5V intermediate bus architectures.
What is the purpose of the AMPMD pin on the LTC1929CG#TRPBF?
The AMPMD pin is not present on the LTC1929CG#TRPBF. It exists only on the base LTC1929 (non-PG) variant to configure the internal op amp as either a unity-gain differential amplifier (AMPMD = GND) or uncommitted op amp (AMPMD = INTVCC). The LTC1929CG#TRPBF is functionally identical to the LTC1929CG-PG, which fixes AMPMD internally - so Pin 15 is PGOOD, not AMPMD. Therefore, the LTC1929CG#TRPBF always operates its differential amplifier in default unity-gain mode.
LTC1929CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- -
- Duty Cycle (Max):
- 99.5%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1929CG#TRPBF FAQ
1.How can I place an order for LTC1929CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1929CG#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 LTC1929CG#TRPBF reliable?
The price and inventory of LTC1929CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1929CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1929CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1929CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1929CG#TRPBF?
LTC1929CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1929CG#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 LTC1929CG#TRPBF?
For technical support, including LTC1929CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1929CG#TRPBF requirements.
6.How does Aetrix verify that LTC1929CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1929CG#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 LTC1929CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1929CG#TRPBF?
All LTC1929CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1929CG#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 LTC1929CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1929CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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