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Analog Devices Inc. LTC1736CG#TRPBF
- Part No.:
- LTC1736CG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1736CG#TRPBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,344
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Product details
Overview
LTC1736CG#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller optimized for CPU core power delivery in mobile computing platforms. It features 5-bit VID voltage programming (0.925V–2.00V), ±1% output voltage accuracy, wide 3.5V–36V input range, and OPTI-LOOP™ compensation. It drives dual N-channel MOSFETs to deliver up to 12A output current in notebook and palmtop systems powering Mobile Pentium® II/III processors.
For engineers reviewing the LTC1736CG#TRPBF datasheet, LTC1736CG#TRPBF pinout, LTC1736CG#TRPBF application, or LTC1736CG#TRPBF equivalent, key selection criteria include VID-compatible DAC resolution, forced continuous mode control via FCB pin, remote sense capability, burst-mode efficiency at light load, and crowbar overvoltage protection - all critical for stable low-voltage CPU rail design.
Technical Context
The LTC1736CG#TRPBF implements a constant-frequency, current-mode control architecture with an internal 5.2V LDO (INTVCC) and external oscillator capacitor (COSC) setting frequency from 265kHz to 335kHz (typical). Its error amplifier drives ITH to modulate peak inductor current, while VOSENSE enables remote output voltage sensing with ±7.5% PGOOD window monitoring.
It integrates VID decoding logic for Intel mobile processor voltage identification, foldback current limiting triggered below 70% VOUT, and latchoff short-circuit protection timed by RUN/SS capacitor discharge. The FCB pin supports three operational modes: Burst Mode (FCB ≥ 0.8V), synchronized cycle-skipping (external clock), or forced continuous conduction (FCB = GND).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-input industrial and notebook DC bus rails without pre-regulation. |
| Output Voltage Range | 0.925V to 2.00V in 25mV/50mV steps - matches Intel mobile VID specifications for Pentium II/III core supply. |
| Output Accuracy | ±1% - ensures tight regulation under line/load/temperature variation for CPU stability. |
| Switching Frequency | 265–335kHz (COSC = 47pF) - balances MOSFET switching loss vs. inductor size for 12A applications. |
| PGOOD Window | ±7.5% of set VOUT - provides reliable power-good assertion for system sequencing and fault detection. |
| Current Sense Threshold | 60–85mV - sets peak inductor current limit; enables precise RSENSE-based IMAX scaling (e.g., 0.004Ω → ~12A). |
| Operating Temp Range | 0°C to +85°C (Commercial grade) - validated for notebook ambient environments. |
Pinout & Package
Package: 24-Lead Plastic SSOP (G package), 0.150" body width, JEDEC MS-013AC compliant. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC (1) | Oscillator timing node | Connects external capacitor to set switching frequency; determines nominal fOSC and sync range. |
| RUN/SS (2) | Soft-start ramp & shutdown control | Capacitor sets soft-start time (~1.25s/µF); <1.5V forces shutdown; >4.1V triggers latchoff on undervoltage. |
| ITH (3) | Error amplifier output / current limit control | Voltage (0–2.4V) sets peak inductor current threshold; directly modulates PWM duty cycle. |
| FCB (4) | Mode selection & sync input | Selects Burst Mode (≥0.8V), forced continuous (GND), or external sync (1.5VPP clock signal). |
| PGOOD (6) | Open-drain status output | Pulled low when VOSENSE deviates >±7.5% from target - used for system power sequencing and fault signaling. |
| VID0–VID4 (11–15) | Digital voltage identification inputs | 5-bit parallel interface setting VOUT per Intel VID table; internal 40kΩ pull-ups to VIDVCC. |
| INTVCC (20) | Internal 5.2V regulator output | Powers gate drivers and control circuitry; can be supplied externally via EXTVCC ≥4.7V for higher efficiency. |
| TG / BG (24 / 19) | Top/bottom N-MOSFET gate drivers | High-current (3A peak) drivers with fast rise/fall times (50–90ns) for efficient synchronous rectification. |
Key Features
| Feature | Design Value |
|---|---|
| 5-bit VID DAC | Enables dynamic CPU voltage scaling across 32 discrete levels (0.925V–2.00V) without external DAC or resistor network. |
| OPTI-LOOP™ Compensation | Allows stable loop response across wide COUT/ESR variations - simplifies output capacitor selection for transient performance. |
| Output Overvoltage Crowbar | Activates immediate top-FET turn-off and bottom-FET turn-on if VOSENSE exceeds +7.5%, preventing damage to downstream logic. |
| Active Voltage Positioning Support | Compatible with AVP schemes where output voltage drops linearly with load current - improves CPU thermal margin during high-load transients. |
| Burst Mode™ Operation | Reduces light-load quiescent current to ~450µA and maintains >80% efficiency at 10mA load - extends battery life in portable systems. |
Applications
| Mobile CPU Core Supply | Notebook System Power |
|---|---|
Use Scenario: Delivering dynamically scaled 1.35V–1.60V core power to Mobile Pentium® II/III processors in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing VID-programmed VDDCORE with remote sense and PGOOD sequencing. Use Value: ±1% accuracy and 7.5% PGOOD window ensure CPU operates within Intel-specified voltage tolerances during DVFS transitions. | Use Scenario: Generating stable low-voltage rails (e.g., 1.5V, 1.8V) for chipset, memory, and I/O subsystems in clamshell-form-factor laptops. IC Role / Device Role / Timing Role: High-efficiency step-down controller supporting multi-rail power architecture with shared EXTVCC and synchronized switching. Use Value: Synchronizable fOSC (up to 500kHz) minimizes beat frequencies between rails, reducing EMI in densely packed PCB layouts. |
| Low-Voltage Industrial SMPS | Embedded Computing Platform |
Use Scenario: Providing regulated 1.2V–1.8V supplies for FPGA or ASIC cores in ruggedized industrial controllers with 24VDC input. IC Role / Device Role / Timing Role: Robust buck controller with 36V absolute max VIN, UVLO (3.5V), and latched short-circuit protection for unregulated field power sources. Use Value: Foldback current limiting and crowbar OVP protect against sustained overloads and wiring faults in harsh environments. | Use Scenario: Powering ARM-based embedded modules requiring programmable output voltage and remote sensing for board-level thermal compensation. IC Role / Device Role / Timing Role: VID-configurable controller with SENSE+/– differential inputs enabling Kelvin connection to minimize IR drop errors. Use Value: Remote sense capability maintains ±1% regulation at load point despite PCB trace resistance up to 50mΩ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6226CRZ-T | 6-bit VID (0.7V–1.85V), 300kHz fixed fOSC, no external COSC, integrated MOSFET drivers only (no external FET support) | Targeted at lower-current (<8A) mobile platforms; lacks programmable frequency and crowbar OVP | Choose ISL6226CRZ-T only if fixed-frequency, lower-cost, integrated-driver solution suffices and VID range matches. |
| TPS51220ARGER | 5-bit VID (0.5V–1.5V), 300kHz/600kHz selectable fOSC, integrated LDO for gate drive, no crowbar OVP, supports AVP | Optimized for newer low-voltage CPUs; narrower VOUT range and no 36V VIN tolerance | Choose TPS51220ARGER for sub-1.5V core rails with tighter space constraints and TI ecosystem integration. |
Compared with ISL6226CRZ-T and TPS51220ARGER, the LTC1736CG#TRPBF offers wider input voltage (3.5–36V), broader VID range (0.925–2.00V), external MOSFET flexibility, and hardware crowbar protection - making it uniquely suitable for legacy and ruggedized mobile CPU power designs requiring field-serviceable FETs and robust fault handling.
Availability
LTC1736CG#TRPBF is available at Aetrix Electronics and suitable for notebook power systems, mobile CPU core supplies, and industrial low-voltage SMPS requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC1736CG#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC series.
The LTC1736CG#TRPBF belongs to Linear's high-performance power management controller family, designed specifically for demanding CPU core voltage regulation in mobile and embedded computing with emphasis on VID compatibility, efficiency across load range, and robust protection.
FAQ
What is the maximum input voltage rating for the LTC1736CG#TRPBF?
The LTC1736CG#TRPBF has an absolute maximum input voltage rating of 36V on the VIN pin. Continuous operation is specified from 3.5V to 30V, with transient tolerance up to 36V. Exceeding 36V may cause permanent damage to the IC. This wide input range allows direct connection to 24V industrial buses or unregulated notebook adapters without front-end pre-regulation.
How does the VID interface on the LTC1736CG#TRPBF set output voltage?
The LTC1736CG#TRPBF uses five digital inputs (VID0–VID4) to select one of 32 output voltages from 0.925V to 2.00V per Intel mobile VID specifications. The internal 5-bit DAC configures a resistive divider between VOSENSE and SGND, establishing VFB = 0.8V in regulation. LSB (VID0) provides 50mV steps above 1.30V and 25mV steps below - enabling precise CPU core voltage scaling.
Does the LTC1736CG#TRPBF support remote output voltage sensing?
Yes, the LTC1736CG#TRPBF supports true remote sensing via dedicated SENSE+ and SENSE– pins. These differential inputs connect directly to the load-side feedback nodes, compensating for IR drop across PCB traces and connectors. When used, the controller regulates VOSENSE to maintain ±1% accuracy at the load point - critical for high-current CPU rails where trace resistance can exceed 20mΩ.
What protection features are integrated into the LTC1736CG#TRPBF?
The LTC1736CG#TRPBF integrates multiple hardware protections: output overvoltage crowbar (immediate top-FET off/bottom-FET on), internal foldback current limiting (reduces IMAX to ~25% during overload), latched short-circuit shutdown (timed by RUN/SS capacitor), and undervoltage lockout (UVLO at 3.5V). These operate independently of external microcontrollers, ensuring fail-safe behavior during fault conditions.
Can the LTC1736CG#TRPBF operate in forced continuous conduction mode?
Yes, the LTC1736CG#TRPBF supports forced continuous conduction mode by grounding the FCB pin. In this mode, both top and bottom MOSFETs switch continuously regardless of load current, eliminating discontinuous operation artifacts. This is useful for noise-sensitive applications or when secondary winding regulation requires consistent switching - though efficiency at light loads drops compared to Burst Mode™ operation.
LTC1736CG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, Intel Pentium® II, III
- Voltage - Input:
- 3.5V ~ 36V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.93V ~ 2V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1736CG#TRPBF FAQ
1.How can I place an order for LTC1736CG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1736CG#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 LTC1736CG#TRPBF reliable?
The price and inventory of LTC1736CG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1736CG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1736CG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1736CG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1736CG#TRPBF?
LTC1736CG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1736CG#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 LTC1736CG#TRPBF?
For technical support, including LTC1736CG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1736CG#TRPBF requirements.
6.How does Aetrix verify that LTC1736CG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1736CG#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 LTC1736CG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1736CG#TRPBF?
All LTC1736CG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1736CG#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 LTC1736CG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1736CG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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