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Analog Devices Inc. LTC1703IG#TRPBF
- Part No.:
- LTC1703IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1703IG#TRPBF.pdf
- Description:
- IC REG CTRLR MOBILE 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,978
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Product details
Overview
LTC1703IG#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous buck controller optimized for mobile Pentium III microprocessor core and I/O supplies. It delivers two independent 550kHz PWM outputs - side 1 programmable via 5-bit Intel Mobile VID (0.9V–2.0V in 25/50mV steps), side 2 externally set (e.g., 1.5V/3A) - with integrated 0.8V ±1% reference, no external current sense resistor, and automatic Burst Mode™ operation for light-load efficiency.
For engineers reviewing the LTC1703IG#TRPBF datasheet, LTC1703IG#TRPBF pinout, LTC1703IG#TRPBF application, or LTC1703IG#TRPBF equivalent, key selection criteria include dual-phase interleaving to reduce input ripple, VID compliance for CPU voltage scaling, 28-pin SSOP package constraints, and gate driver capability for N-channel MOSFETs up to 10,000pF.
Technical Context
The LTC1703IG#TRPBF implements two independent voltage-mode feedback controllers with 25MHz gain-bandwidth error amplifiers, enabling high-loop crossover frequencies and fast transient response. Each channel uses floating top-gate drivers powered by charge-pumped BOOST pins and senses current via VDS of the bottom MOSFET, eliminating external sense resistors.
Its architecture supports out-of-phase (180°) dual-channel operation to halve RMS input current, integrates latched overvoltage protection (15% trip threshold, 25µs delay), and features independent RUN/SS pins for staggered startup and <100µA shutdown current. The VID interface on side 1 includes internal 40kΩ pull-ups with diode clamping for safe logic-level interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical; enables compact 1µH inductors and low-ESR ceramic output capacitors. |
| Output Voltage Range (Side 1) | 0.9V to 2.0V in 25mV/50mV steps per Intel Mobile VID spec; no external resistors needed for setting. |
| Reference Voltage | 0.800V ±1% (LTC1703I grade); ensures ≤±1.5% total DC output regulation at converter outputs. |
| Max Output Current (per Channel) | Up to 25A; determined by external MOSFET selection and thermal design, not IC-limited. |
| Shutdown Supply Current | <100µA with both RUN/SS pins grounded; critical for battery-powered system standby efficiency. |
| Operating Temperature | –40°C to +85°C (I-grade); qualified for industrial and mobile computing environments. |
| Fault Response | Latched FAULT output trips at +15% overvoltage with 25µs delay; forces BG pins high to clamp output until power cycle. |
Pinout & Package
Package: 28-pin Plastic SSOP (G package), 0.025" pitch, body size 10.2mm × 5.3mm. Thermal pad not present; requires standard SSOP PCB footprint and reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVCC (1) | Driver Power Supply | Supplies high-current gate drivers for QB1/QB2; must be ≥VGS(ON) of bottom FETs; bypass to PGND with ≥1µF. |
| BOOST1 (2) | Top-Gate Charge Pump Supply | Provides floating supply for TG1; bypass to SW1 with 1µF capacitor; Schottky diode from VIN improves drive. |
| BG1 (3) | Bottom Gate Driver Output | Drives gate of QB1 (N-MOSFET); sinks up to 5A peak; goes high during FAULT to clamp VOUT1. |
| TG1 (4) | Top Gate Driver Output | Drives gate of QT1 (N-MOSFET); floating output referenced to SW1; designed for ≤10,000pF load. |
| SW1 (5) | Switching Node | Connects to drain of QT1 and source of QB1; used for current sensing (VDS) and BOOST1 charge pump return. |
| IMAX1 (6) | Current Limit Threshold | Sets overcurrent trip point via external resistor to PGND; internal 10µA pull-up enables Kelvin connection. |
| FCB (7) | Force Continuous Buck | Pull to SGND to disable Burst Mode™ on both channels; normally tied to VCC for auto-mode operation. |
| RUN/SS1 (8) | Channel 1 Enable & Soft-Start | Pull low to disable channel 1; capacitor to SGND sets soft-start ramp time (~50ms/µF). |
| COMP1 (9) | Error Amplifier Output | Connects to compensation network (R/C) for loop stability; interfaces directly with PWM comparator. |
| SGND (10) | Signal Ground Reference | Return for FB, COMP, RUN/SS, VID; must be separated from PGND and joined at single point near CIN. |
| FB1 (11) | Side 1 Feedback Input | Internally connected to VID resistor network; connects to SENSE (VOUT1) for closed-loop regulation. |
| SENSE (12) | Side 1 Output Sense | Direct connection to VOUT1; completes VID-based feedback path; improves accuracy under PCB trace resistance. |
| VID0–VID4 (13–17) | 5-Bit VID Programming Inputs | Digital inputs selecting side 1 output voltage (Table 1); each has 40kΩ pull-up to VCC via diode for overvoltage tolerance. |
| VCC (18) | Analog/Digital Core Supply | 3V–7V supply for internal logic, references, and error amps; bypass to SGND with ≥1µF capacitor. |
| FB2 (19) | Side 2 Feedback Input | External resistor divider input for setting VOUT2; no VID circuitry; requires full compensation network. |
| COMP2 (20) | Channel 2 Error Amplifier Output | Same function as COMP1; independent loop compensation required for side 2 stability. |
| RUN/SS2 (21) | Channel 2 Enable & Soft-Start | Independent control of channel 2; identical behavior to RUN/SS1. |
| FAULT (22) | Latched Overvoltage Flag | Open-drain output; pulls high on +15% overvoltage; ties to SGND to disable latching behavior. |
| PGND (23) | Power Ground Return | Return path for BG1/BG2 drivers and high-current paths; connect near QB1/QB2 sources and CIN/COUT. |
| SW2 (24) | Channel 2 Switching Node | Identical role to SW1; connects to QT2 drain and QB2 source. |
| TG2 (25) | Channel 2 Top Gate Driver | Identical to TG1; floating output referenced to SW2. |
| BG2 (26) | Channel 2 Bottom Gate Driver | Identical to BG1; drives QB2 gate; goes high during FAULT. |
| BOOST2 (27) | Channel 2 Top-Gate Supply | Identical to BOOST1; bypass to SW2 with 1µF capacitor. |
| IMAX2 (28) | Channel 2 Current Limit Set | Identical to IMAX1; sets overcurrent threshold for side 2 using external resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Intel Mobile VID Compliance | Side 1 supports full 5-bit VID code table (0.9V–2.0V) without external resistors - enables dynamic CPU voltage scaling. |
| Interleaved Dual-Phase Operation | 180° phase shift between channels reduces input capacitor RMS current by >45%, lowering EMI and enabling smaller CIN. |
| VDS-Based Current Sensing | Eliminates external sense resistor and associated power loss in high-current path - improves efficiency and simplifies layout. |
| Integrated 25MHz Error Amplifier | Enables complex pole-zero compensation for stable loop response across wide load/transient conditions. |
| Burst Mode™ for Light Loads | Automatically transitions to discontinuous conduction then Burst Mode™ below ~10% load - maintains >80% efficiency at 100mA. |
| Latched Overvoltage Protection | Hardware fault detection with 25µs delay and automatic shutdown - protects CPU from destructive overvoltage events. |
Applications
| Mobile Pentium III Processor Core Supply | Microprocessor I/O Supply |
|---|---|
Use Scenario: Powers the core voltage (VCCP) of Intel Mobile Pentium III processors in notebook PCs, requiring precise 0.9V–2.0V scaling and fast load transients. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller with VID-programmed side 1 and independently set side 2; manages CPU voltage sequencing and regulation. Use Value: Achieves ≤±1.5% DC regulation and ±2.2% transient deviation while supporting dynamic VID changes during CPU frequency scaling. | Use Scenario: Generates stable 1.5V/3A I/O supply (VCCIO) for Pentium III chipset interfaces, co-located with core supply on same PCB area. IC Role / Device Role / Timing Role: Side 2 operates as standalone buck controller with external resistor divider; shares PVCC/VCC rails and thermal management with side 1. Use Value: Enables compact dual-output solution in ≤1.5in² PCB area using shared input capacitors and interleaved switching to minimize input ripple. |
| Multiple Logic Supply Generator | High-Efficiency 2-Step Power Architecture |
Use Scenario: Generates multiple logic rail voltages (e.g., 1.8V, 2.5V, 3.3V) in embedded systems where space and efficiency are constrained. IC Role / Device Role / Timing Role: Configured with side 1 for VID-controlled rail and side 2 for fixed rail; uses separate inductor/capacitor sets per output. Use Value: Delivers >90% peak efficiency across 0.5A–15A loads while maintaining tight cross-regulation and independent enable control. | Use Scenario: Second-stage regulator in 2-step power systems (e.g., 19V battery → 5V intermediate → 1.5V CPU core), improving thermal distribution and system efficiency. IC Role / Device Role / Timing Role: Converts stable 5V intermediate bus to low-voltage, high-current CPU supply; leverages 550kHz switching for small magnetics. Use Value: Reduces RMS input current by 48% vs. single-phase dual controller, cutting power loss in input path by factor of 3.75 and easing EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6225CRZ-T | Single-channel 5-bit VID controller; no dual-phase interleaving; 300kHz max switching frequency. | Requires two ICs for dual output; lacks FCB pin and latched FAULT; lower integration for CPU core/I/O separation. | Select when only one regulated rail is needed or when lower switching frequency simplifies EMI filtering. |
| TPS51220ARUKT | Integrated dual-phase controller with 3-bit VID (0.7V–1.5V); includes MOSFET drivers; 600kHz switching. | Supports newer Intel mobile CPUs but narrower VID range; no separate PVCC pin; less flexible for discrete FET selection. | Select for newer platform compatibility where integrated drivers and tighter VID range suffice. |
Compared with ISL6225CRZ-T and TPS51220ARUKT, the LTC1703IG#TRPBF provides broader VID coverage (0.9V–2.0V), true dual independent controllers in one package, and dedicated PVCC/PGND separation for optimal high-current layout - making it uniquely suited for legacy Pentium III designs requiring maximum flexibility and proven reliability.
Availability
LTC1703IG#TRPBF is available at Aetrix Electronics and suitable for mobile computing power supplies, industrial embedded controllers, and high-reliability CPU voltage regulation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1703IG#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 (including former Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, communications, and power conversion markets.
The LTC1703IG#TRPBF belongs to Linear's legacy high-efficiency power controller product line, specifically engineered for mobile microprocessor voltage regulation with emphasis on VID compliance, dual-phase interleaving, and robust fault protection.
FAQ
What is the operating temperature range for the LTC1703IG#TRPBF?
The LTC1703IG#TRPBF is rated for –40°C to +85°C ambient operation (I-grade). This specification is validated per the Absolute Maximum Ratings table and Electrical Characteristics test conditions. The device maintains full parameter performance across this range, including reference voltage accuracy (0.800V ±1%), feedback voltage tolerance, and oscillator frequency stability. Thermal derating is not required within this envelope, and the 28-pin SSOP package provides adequate thermal dissipation for typical mobile CPU supply applications.
Does the LTC1703IG#TRPBF support latched or auto-recover fault protection?
The LTC1703IG#TRPBF features latched overvoltage fault protection by default: when either output exceeds +15% of its programmed value for >25µs, the FAULT pin goes high and both BG drivers force high to clamp the output, disabling further switching until power is cycled. However, tying the FAULT pin directly to SGND disables latching and enables auto-recovery - the controller resumes normal operation immediately after the overvoltage condition clears. This configuration is confirmed in the Pin Functions section and Typical Application schematic.
Can the LTC1703IG#TRPBF operate with only one channel enabled?
Yes, the LTC1703IG#TRPBF supports independent channel enable/disable via RUN/SS1 and RUN/SS2 pins. Pulling RUN/SS1 low disables only channel 1 (TG1/BG1 go low), while RUN/SS2 low disables only channel 2. Both pins low places the entire LTC1703IG#TRPBF into shutdown mode with supply current dropping below 100µA. This capability is explicitly documented in the Pin Functions description and Electrical Characteristics table under ICC and IPVCC shutdown conditions.
What is the purpose of the FCB pin on the LTC1703IG#TRPBF?
The FCB (Force Continuous Bar) pin on the LTC1703IG#TRPBF forces both converters to remain in continuous conduction mode regardless of load current. When FCB voltage drops below 0.8V (e.g., tied to SGND), Burst Mode™ and discontinuous operation are disabled. This is useful for noise-sensitive applications or when output ripple must be minimized at light loads. FCB is normally tied to VCC to allow automatic mode transition. Leaving FCB floating is prohibited per the Pin Functions section.
How does the LTC1703IG#TRPBF achieve current limiting without an external sense resistor?
The LTC1703IG#TRPBF implements VDS-based current limiting: it monitors the voltage drop across the bottom N-channel MOSFET (QB1/QB2) while that FET is conducting. The IMAX1/IMAX2 pins set the comparator threshold using an internal 10µA current source and an external resistor to PGND. This eliminates the power loss and board space associated with a discrete sense resistor in the high-current path, while maintaining accurate overcurrent protection calibrated to the RDS(on) of the selected MOSFET.
LTC1703IG#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
- Applications:
- Controller, Mobile Intel Pentium® III
- Voltage - Input:
- 3V ~ 7V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.9V ~ 2V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1703IG#TRPBF FAQ
1.How can I place an order for LTC1703IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1703IG#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 LTC1703IG#TRPBF reliable?
The price and inventory of LTC1703IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1703IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1703IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1703IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1703IG#TRPBF?
LTC1703IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1703IG#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 LTC1703IG#TRPBF?
For technical support, including LTC1703IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1703IG#TRPBF requirements.
6.How does Aetrix verify that LTC1703IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1703IG#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 LTC1703IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1703IG#TRPBF?
All LTC1703IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1703IG#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 LTC1703IG#TRPBF part is unused and in its original packaging.
Return procedure for LTC1703IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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