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Analog Devices Inc. LTC1736IG#PBF
- Part No.:
- LTC1736IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1736IG#PBF.pdf
- Description:
- IC REG CONV PENTIUM 1OUT 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,492
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Product details
Overview
LTC1736IG#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller optimized for CPU power delivery. It features 5-bit VID voltage programming (0.925V–2.00V), ±1% output voltage accuracy, wide 3.5V–36V input range, and programmable fixed frequency up to 500kHz. It is used in mobile Pentium II/III processor power supplies with remote sensing and active voltage positioning support.
For engineers reviewing the LTC1736IG#PBF datasheet, LTC1736IG#PBF pinout, LTC1736IG#PBF application, or LTC1736IG#PBF equivalent, key selection criteria include VID-compatible DAC resolution, OPTI-LOOP compensation flexibility, forced continuous mode control via FCB pin, and crowbar overvoltage protection for CPU rail integrity.
Technical Context
The LTC1736IG#PBF implements a constant-frequency current-mode control architecture with dual N-channel MOSFET synchronous drive. Its error amplifier output (ITH) directly modulates peak inductor current, while VOSENSE enables remote output voltage sensing and supports active voltage positioning.
It integrates OPTI-LOOP compensation for transient response optimization across wide output capacitance and ESR ranges, and uses a programmable oscillator (via COSC capacitor) with external synchronization capability (FCB pin) supporting 90–130% of nominal frequency. Protection includes foldback current limiting, latched short-circuit shutdown with defeatable timer, and output overvoltage crowbar.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-input industrial and notebook DC bus rails including 5V, 12V, 24V systems. |
| Output Voltage Range | 0.925V to 2.00V in 25mV/50mV steps - matches Intel mobile VID specifications for Pentium II/III processors. |
| Output Accuracy | ±1% - ensures tight regulation critical for low-voltage CPU core supply stability under load transients. |
| Switching Frequency | Up to 500kHz (synchronizable) - balances efficiency vs. component size; set by external COSC capacitor. |
| Power Good Threshold | ±7.5% window around programmed VOUT - provides reliable system-level power sequencing and fault detection. |
| Current Sense Threshold | 60mV to 85mV (ΔVSENSE(MAX)) - sets peak inductor current limit; scales with RSENSE for IMAX design. |
| Operating Temp Range | –40°C to +85°C - qualified for extended industrial and mobile computing environments. |
Pinout & Package
Package: 24-Lead Plastic SSOP (G package), 0.150" wide body, 0.025" pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC (1) | Oscillator timing input | External capacitor sets switching frequency; enables synchronization when driven via FCB pin. |
| RUN/SS (2) | Soft-start and enable control | Capacitor sets ramp time; <1.5V disables operation; discharge initiates latchoff during overcurrent. |
| ITH (3) | Error amplifier output | Directly controls peak inductor current; 0V–2.4V range enables precise current-mode loop tuning. |
| FCB (4) | Forced continuous/sync input | GND = forced continuous; INTVCC = Burst Mode; external clock = synchronized discontinuous operation. |
| SGND (5) | Small-signal ground reference | Single-point tie for compensation network and COSC/CSS to minimize noise coupling. |
| PGOOD (6) | Open-drain status output | Pulled low when VOSENSE deviates >±7.5% - used for system power-good signaling and sequencing. |
| SENSE– / SENSE+ (7,8) | Differential current sense inputs | Monitor voltage drop across RSENSE; built-in offset enables accurate current foldback and short-circuit detection. |
| VFB (9) | Feedback divider tap | 0.8V reference point; VID inputs program internal resistive divider between VOSENSE and SGND. |
| VOSENSE (10) | Remote feedback input | Accepts remotely sensed output voltage; enables active voltage positioning and high-accuracy regulation. |
| VID0–VID4 (11–15) | Digital VID control inputs | 5-bit interface sets output voltage per Intel mobile VID spec; internal pull-ups to VIDVCC simplify interface. |
| VIDVCC (16) | VID logic supply | 2.7V–5.5V supply for VID inputs; typically tied to INTVCC for self-contained operation. |
| EXTVCC (17) | External VCC switch input | Enables high-efficiency INTVCC sourcing from 5V system rail when >4.7V; improves gate drive at low VIN. |
| PGND (18) | Power ground return | Common return for bottom MOSFET source, Schottky anode, and CIN negative terminal. |
| BG (19) | Bottom gate driver output | Drives bottom N-MOSFET gate from PGND to INTVCC; supports high-current synchronous rectification. |
| INTVCC (20) | Internal 5.2V regulator output | Supplies drivers and control circuitry; decoupled with 1µF ceramic + ≥4.7µF tantalum for stability. |
| VIN (21) | Main input supply | 3.5V–36V input; requires local ceramic + bulk capacitor decoupling to handle high RMS ripple current. |
| SW (22) | Switch node | Connects to inductor and bootstrap capacitor; swings from ~–0.4V (Schottky drop) to VIN. |
| BOOST (23) | Floating top-gate supply | Return for bootstrap capacitor; voltage swing = INTVCC superimposed on SW node. |
| TG (24) | Top gate driver output | Floating driver output referenced to SW; delivers full INTVCC swing to top N-MOSFET gate. |
Key Features
| Feature | Design Value |
|---|---|
| 5-bit VID DAC | Programs output from 0.925V to 2.00V in 25mV/50mV steps - enables dynamic CPU voltage scaling per Intel mobile specification. |
| OPTI-LOOP Compensation | Allows stable transient response across wide range of output capacitor values and ESR - reduces need for custom compensation per design. |
| Pin-defeatable Burst Mode | Enables high-efficiency light-load operation (<10mA) with automatic transition to forced continuous mode - eliminates audible noise without sacrificing regulation. |
| Output Overvoltage Crowbar | Activates immediate bottom-FET conduction upon >7.5% overvoltage - protects CPU from destructive overvoltage events during transients or faults. |
| Active Voltage Positioning Support | VOSENSE input accepts remote sense signals - maintains tight regulation at CPU die while compensating for PCB IR drop. |
Applications
| Mobile CPU Core Supply | Notebook System Power |
|---|---|
Use Scenario: Powering Intel Mobile Pentium II/III processors requiring dynamically adjustable core voltage with tight transient response. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing VID-programmed VCCCORE with remote sensing and active voltage positioning. Use Value: Enables compliance with Intel mobile VID specs, ±1% accuracy ensures stable CPU operation under rapid load changes up to 12A. | Use Scenario: Generating low-noise, high-efficiency 1.35V–1.60V rails for embedded controllers and chipset I/O in thin-and-light notebooks. IC Role / Device Role / Timing Role: High-efficiency step-down controller with Burst Mode for standby power savings and forced continuous mode for clean sleep/wake transitions. Use Value: Achieves >90% efficiency at 5A load (VIN=15V) and maintains >80% down to 10mA via pin-defeatable Burst Mode. |
| Low-Voltage Industrial PSU | Embedded Processor Power |
Use Scenario: Providing regulated 1.2V–1.8V supplies for FPGA or DSP cores in ruggedized industrial equipment with wide input voltage variation. IC Role / Device Role / Timing Role: Wide-input (3.5V–36V) synchronous buck controller with UVLO, overvoltage crowbar, and thermal-latched shutdown. Use Value: Maintains regulation across 12V/24V battery or PoE-derived inputs; crowbar protection prevents downstream IC damage during fault conditions. | Use Scenario: Delivering tightly regulated core voltage to ARM-based SoCs in portable medical or test instrumentation with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable controller enabling fixed-frequency operation to avoid sensitive RF bands; OPTI-LOOP minimizes output capacitor count. Use Value: Synchronization to external clock eliminates beat frequencies; ±1% accuracy and remote sensing ensure SoC stability across temperature and layout variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1735IG#PBF | Same pinout, identical VID interface, but lacks OPTI-LOOP compensation and has lower max frequency (300kHz vs 500kHz). | Suitable for cost-sensitive designs where transient response requirements are relaxed and lower switching loss is acceptable. | Select LTC1735IG#PBF only if design does not require wide-output-capacitor compatibility or >300kHz operation. |
| TPS51116PWR | Integrated MOSFETs (vs external), 3–28V input, supports VR11.1/VR12.0; no VID0–VID4 pins - uses SMBus interface instead. | Targeted at newer Intel platforms requiring digital interface and integrated power stages; not VID-pin compatible. | Choose TPS51116PWR only for new designs targeting VR11+/VR12 compliance and integrated FET simplicity. |
Compared with LTC1735IG#PBF, the LTC1736IG#PBF offers higher frequency headroom and OPTI-LOOP for broader capacitor compatibility; versus TPS51116PWR, it provides direct VID-pin compatibility for legacy Pentium II/III systems but requires external MOSFETs and discrete compensation.
Availability
LTC1736IG#PBF is available at Aetrix Electronics and suitable for notebook CPU power supplies, industrial low-voltage PSUs, and embedded processor core rails requiring stable component supply and long-term lifecycle support.
Supply support for LTC1736IG#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1736IG#PBF belongs to Linear's CPU power controller product line, designed specifically for high-accuracy, VID-programmable synchronous buck regulation in mobile computing platforms.
FAQ
What is the operating temperature range for the LTC1736IG#PBF?
The LTC1736IG#PBF is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade rating makes it suitable for deployment in mobile computing, ruggedized industrial equipment, and embedded systems exposed to extended thermal environments. The device includes thermal shutdown protection and is characterized across this full range for parameters including output accuracy, current sense threshold, and oscillator frequency stability.
How does the LTC1736IG#PBF implement active voltage positioning (AVP)?
The LTC1736IG#PBF supports active voltage positioning through its VOSENSE pin, which accepts a remote-sensed feedback signal from the CPU load point. When configured with appropriate external resistor dividers and compensation, the controller actively lowers the output voltage under increasing load to counteract IR drop in the power delivery path - maintaining constant voltage at the die. This behavior is enabled by the combination of VOSENSE input, VFB reference, and OPTI-LOOP compensation network.
Can the LTC1736IG#PBF be synchronized to an external clock, and what are the limits?
Yes, the LTC1736IG#PBF can be synchronized to an external clock applied to the FCB pin. The internal oscillator locks to external frequencies between 90% and 130% of its nominal frequency (set by COSC). The external clock must exceed 1.3V for ≥0.3µs (high) and fall below 0.3V for ≥0.3µs (low). Top MOSFET turn-on aligns with the rising edge of the external clock, ensuring deterministic timing for EMI-sensitive applications.
What protection features does the LTC1736IG#PBF include for output overvoltage conditions?
The LTC1736IG#PBF includes dedicated output overvoltage crowbar protection. When VOSENSE exceeds the programmed value by more than +7.5%, the overvoltage comparator triggers immediate shutdown of the top MOSFET and full conduction of the bottom MOSFET, forcing rapid discharge of the output capacitor. This hardware-level crowbar action protects connected CPUs and other low-voltage logic from destructive overvoltage events caused by feedback loop failure or transient surges.
How is the output voltage programmed on the LTC1736IG#PBF?
The LTC1736IG#PBF uses five digital inputs (VID0–VID4) to program the output voltage via an internal 5-bit DAC-based resistive divider. These pins accept logic-high (VIDVCC or floating) or logic-low (GND) states, selecting one of 32 possible output voltages from 0.925V to 2.00V. The LSB (VID0) provides 25mV steps below 1.30V and 50mV steps above - fully compliant with Intel mobile Pentium II/III VID specifications. Internal pull-up resistors simplify interface design.
LTC1736IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC1736IG#PBF FAQ
1.How can I place an order for LTC1736IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1736IG#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 LTC1736IG#PBF reliable?
The price and inventory of LTC1736IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1736IG#PBF is usually 5 days.
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LTC1736IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1736IG#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 LTC1736IG#PBF?
For technical support, including LTC1736IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1736IG#PBF requirements.
6.How does Aetrix verify that LTC1736IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1736IG#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 LTC1736IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC1736IG#PBF?
All LTC1736IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1736IG#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 LTC1736IG#PBF part is unused and in its original packaging.
Return procedure for LTC1736IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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