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Analog Devices Inc. LTC3734EUH#PBF
- Part No.:
- LTC3734EUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC3734EUH#PBF.pdf
- Description:
- IC REG CTRLR CPU 1OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,038
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Product details
Overview
LTC3734EUH#PBF from Analog Devices (formerly Linear Technology) is a single-phase synchronous step-down DC/DC controller IC designed for Intel mobile CPU voltage regulation. It drives all-N-channel MOSFETs, supports 6-bit IMVP-IV VID programming (0.7V–1.708V), operates up to 550kHz, and delivers ±1% output voltage accuracy in applications such as laptop VRMs and mobile computing power stages.
For engineers reviewing the LTC3734EUH#PBF datasheet, LTC3734EUH#PBF pinout, LTC3734EUH#PBF application, or LTC3734EUH#PBF equivalent, key selection criteria include its Intel-compatible PSIB input for power-saving mode selection, OPTI-LOOP® compensation for transient optimization across diverse output capacitors, lossless voltage positioning, and integrated gate drivers eliminating external driver ICs.
Technical Context
The LTC3734EUH#PBF implements a constant-frequency current-mode control architecture with an internal 0.6V reference and programmable oscillator (210kHz–550kHz via FREQSET pin). Its error amplifier output (ITH) directly controls peak inductor current through a differential current sense comparator with 59–85mV threshold range.
It features dual operational modes: fully synchronous mode (PSIB > 0.6V) for minimal output ripple and fast transient response, and power-saving mode (PSIB < 0.6V) enabling discontinuous conduction to maximize light-load efficiency. Deep sleep and deeper sleep states are managed via STP_CPUB and DPRSLPVR inputs with resistor-programmable offsets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.7V to 1.708V via 6-bit VID; resistor-programmable at boot-up and deeper sleep |
| Switching Frequency | 210kHz to 550kHz; set by 0V–2.4V analog voltage on FREQSET pin |
| Current Sense Threshold | 59–85mV; enables precise overcurrent protection and load-current sensing |
| Output Accuracy | ±1% over temperature; critical for Intel IMVP-IV compliance in CPU core regulation |
| Gate Drive Capability | 5A peak TG/BG drive; eliminates need for external MOSFET drivers in high-current VRM designs |
| Protection Features | Overvoltage (±10% trip), foldback current limit, short-circuit shutdown timer with defeat option |
| Operating Temp Range | –40°C to +85°C; qualified for industrial and mobile computing environments |
Pinout & Package
The LTC3734EUH#PBF is housed in a thermally enhanced 32-lead 5mm × 5mm × 0.8mm QFN package with exposed pad (Pin 33) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID5 (Pins 13,14,15,17,18,19) | IMVP-IV VID code input | Directly sets regulated output voltage during active mode per Intel specification |
| TG (Pin 24), BG (Pin 21) | Top/bottom N-MOSFET gate drivers | High-current (5A peak), low-propagation-delay outputs driving external power stage |
| SENSE+ / SENSE– (Pins 6,7) | Differential current sense inputs | Enable lossless current monitoring using external sense resistor; support foldback limiting |
| PSIB (Pin 32) | Power Saving Indicator Bias | Selects between synchronous (fast transient) and power-saving (high-efficiency) operating modes |
| RUN/SS (Pin 10) | Soft-start, run control, fault timer | Capacitor-based ramp controls inrush; also serves as short-circuit latchoff timeout input |
| PGOOD (Pin 26) | Open-drain power-good indicator | Signals valid output within ±10%; includes adaptive 110µs masking during VID/sleep transitions |
Key Features
| Feature | Design Value |
|---|---|
| Intel IMVP-IV Compliance | Full 6-bit VID decoding (0.7V–1.708V), PSIB interface, MCH_PG synchronization, and deep-sleep offset support |
| OPTI-LOOP® Compensation | Allows stable loop tuning across wide range of output capacitor ESR and capacitance values without redesign |
| Lossless Voltage Positioning | Enables accurate droop-based current sharing in multi-phase systems without sense resistors |
| Integrated Gate Drivers | Eliminates external driver ICs; reduces BOM count and layout complexity in high-current VRMs |
| Adaptive PGOOD Masking | 110µs blanking window prevents false resets during CPU state transitions (VID, sleep, deeper sleep) |
Applications
| Mobile CPU Core Regulation | Intel Mobile Platform VRM |
|---|---|
|
Use Scenario: Regulating core voltage for Intel Pentium M, Core Solo/Duo, and compatible mobile CPUs in laptops and ultraportables. IC Role / Device Role / Timing Role: Primary voltage regulator controller managing dynamic VID changes, deep-sleep entry/exit, and MCH_PG handshaking. Use Value: Enables compliant IMVP-IV operation with ±1% accuracy, fast transient response (<10µs load step recovery), and seamless transition between active, deep-sleep, and deeper-sleep states. |
Use Scenario: Implementing compact, high-efficiency single-phase VRM on Intel chipset reference designs for mobile notebooks. IC Role / Device Role / Timing Role: Central controller coordinating gate timing, current sensing, frequency programming, and power-good signaling per platform requirements. Use Value: Reduces component count via integrated drivers and OPTI-LOOP®, supports 20A+ output with <1% load regulation, and simplifies compliance testing with built-in AVP and masking logic. |
| Server Baseboard Management | Embedded Computing Power Stage |
|
Use Scenario: Providing auxiliary CPU core rail in 1U rackmount servers where space-constrained VRMs require high integration. IC Role / Device Role / Timing Role: High-density DC/DC controller delivering stable 1.2V/1.5V rails with programmable frequency and robust overvoltage/overcurrent protection. Use Value: Delivers >90% efficiency at 20A (VIN=15V→VOUT=1.6V), supports remote monitoring via PGOOD and ITH, and withstands –40°C to +85°C ambient without derating. |
Use Scenario: Powering ARM or x86 application processors in industrial gateways, medical handhelds, and ruggedized edge devices. IC Role / Device Role / Timing Role: Flexible buck controller supporting both VID-based and resistor-programmed outputs for mixed-signal SoC supply domains. Use Value: Enables boot-time voltage setting independent of processor VID, supports deep-sleep offset for ultra-low-power idle states, and provides precise current limiting for system-level fault containment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6260CRZ-T | Supports 3-phase operation; lacks OPTI-LOOP®; uses different VID mapping (IMVP-6) | Targeted at higher-current multi-phase notebook VRMs; not drop-in for IMVP-IV systems | Choose ISL6260CRZ-T only when upgrading to IMVP-6 platforms or requiring >30A output with phase interleaving. |
| TPS51220ARUKR | Lower max frequency (1MHz); integrated LDO bias rail; no deep-sleep offset programming | Optimized for cost-sensitive single-phase Intel Atom/Celeron designs; limited sleep-state flexibility | Prefer TPS51220ARUKR for entry-level mobile platforms where deep-sleep offset and 550kHz switching are noncritical. |
Compared with ISL6260CRZ-T and TPS51220ARUKR, the LTC3734EUH#PBF uniquely combines IMVP-IV VID compliance, resistor-programmable boot/deep-sleep voltages, and OPTI-LOOP® for broad capacitor compatibility-making it the preferred choice for legacy Intel mobile CPU VRMs requiring design stability and field-proven reliability.
Availability
LTC3734EUH#PBF is available at Aetrix Electronics and suitable for mobile computing power supplies, Intel VRM reference designs, and industrial embedded CPU power stages requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3734EUH#PBF 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 full technical and manufacturing continuity for its high-performance power management portfolio.
The LTC3734EUH#PBF belongs to Linear's precision DC/DC controller family, engineered specifically for Intel mobile voltage regulation standards including IMVP-IV, with emphasis on transient performance, efficiency across load ranges, and seamless sleep-state transitions.
FAQ
What is the primary function of the LTC3734EUH#PBF in a power system?
The LTC3734EUH#PBF is a single-phase synchronous step-down DC/DC controller IC that regulates CPU core voltage in Intel mobile platforms. It interprets 6-bit VID codes, drives external N-channel MOSFETs, manages deep-sleep states via STP_CPUB and DPRSLPVR, and ensures ±1% output accuracy. The LTC3734EUH#PBF integrates gate drivers, error amplification, and protection circuitry to form a complete VRM control solution without external drivers.
How does the PSIB pin affect operation of the LTC3734EUH#PBF?
The PSIB pin on the LTC3734EUH#PBF selects between two operating modes: when pulled above 0.6V, it enables fully synchronous mode for lowest output ripple and fastest transient response; when below 0.6V, it activates power-saving mode, turning off the bottom MOSFET during reverse inductor current to eliminate circulating losses and maximize light-load efficiency. This dual-mode capability is essential for meeting Intel IMVP-IV efficiency requirements across the full load range.
Can the LTC3734EUH#PBF be used without a microprocessor VID interface?
Yes - the LTC3734EUH#PBF supports resistor-programmed output voltage during initial boot-up (via RBOOT pin) and in deeper sleep state (via RDPRSLP and RDPSLP pins), independent of VID signals. This allows standalone operation in systems lacking a VID-capable processor or during pre-boot sequences. The LTC3734EUH#PBF ignores VID bits until after MCH_PG assertion and 15 clock cycles, ensuring reliable startup before VID handoff.
What package type and thermal characteristics does the LTC3734EUH#PBF have?
The LTC3734EUH#PBF uses a 32-lead 5mm × 5mm × 0.8mm plastic QFN package with exposed thermal pad (Pin 33) that must be soldered to PCB ground. Its junction-to-ambient thermal resistance (θJA) is 34°C/W, and maximum junction temperature is 125°C. This package enables high-power density in space-constrained mobile VRMs while maintaining thermal reliability under continuous 20A output conditions.
Does the LTC3734EUH#PBF include overvoltage protection, and how does it respond?
Yes - the LTC3734EUH#PBF includes dedicated overvoltage protection that triggers when output exceeds ±10% of the nominal set point (e.g., >0.66V for a 0.6V reference). Upon detection, the top MOSFET is immediately turned off and the bottom MOSFET is turned on to sink excess energy and clamp the output. This hardware-level response acts independently of the control loop and ensures robust protection against transient overshoots and fault conditions.
LTC3734EUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller, Intel Mobile CPU
- Voltage - Input:
- 4V ~ 30V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.7V ~ 1.71V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
LTC3734EUH#PBF FAQ
1.How can I place an order for LTC3734EUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3734EUH#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 LTC3734EUH#PBF reliable?
The price and inventory of LTC3734EUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3734EUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3734EUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3734EUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3734EUH#PBF?
LTC3734EUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3734EUH#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 LTC3734EUH#PBF?
For technical support, including LTC3734EUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3734EUH#PBF requirements.
6.How does Aetrix verify that LTC3734EUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3734EUH#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 LTC3734EUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3734EUH#PBF?
All LTC3734EUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3734EUH#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 LTC3734EUH#PBF part is unused and in its original packaging.
Return procedure for LTC3734EUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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