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Analog Devices Inc. LTC3703IGN#PBF
- Part No.:
- LTC3703IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703IGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:619
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Product details
Overview
LTC3703IGN#PBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-down switching regulator controller with voltage-mode architecture, driving external dual N-channel MOSFETs. It delivers ±1% DC output accuracy, programmable 100–600kHz switching frequency, and operates across –40°C to 125°C junction temperature. Ideal for telecom power supplies and automotive high-voltage DC/DC conversion.
For engineers reviewing the LTC3703IGN#PBF datasheet, LTC3703IGN#PBF pinout, LTC3703IGN#PBF application, or LTC3703IGN#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world application mappings - all extracted from official Linear Technology documentation and product markings.
Technical Context
The LTC3703IGN#PBF implements a constant-frequency, voltage-mode control loop with patented line feedforward compensation, enabling fast line transient response without current-sense resistors. Its error amplifier features 25MHz unity-gain bandwidth and 74–85dB DC open-loop gain, supporting high crossover frequencies with low-inductance designs.
It integrates dual 1.5–2A peak gate drivers: TG drives the high-side N-MOSFET via floating bootstrap supply (BOOST–SW), while BG drives the low-side N-MOSFET referenced to BGRTN. Current limiting uses synchronous MOSFET RDS(on) sensing at IMAX, eliminating external sense resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | Up to 100V VIN - enables direct conversion from 48V telecom or 72V automotive battery rails without pre-regulation. |
| Output Accuracy | ±1% reference (0.792–0.812V) - ensures stable regulation of 12V, 5V, or sub-1V outputs without trimming. |
| Switching Frequency | 100–600kHz, programmable via fSET resistor or synchronizable externally - balances efficiency, size, and EMI in noise-sensitive systems. |
| Gate Drive Strength | 1.5–2A peak per driver with ≤1.5Ω pull-down RDS(on) - supports paralleling MOSFETs and fast slew rates for <100ns transitions. |
| Current Limit Sensing | Resistor-programmable via IMAX pin using internal 12µA current source - eliminates sense resistor losses and PCB area. |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive and industrial base station environments. |
| Shutdown Current | 50µA typical - enables ultra-low-power standby in always-on telecom or telematics modules. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN16), 0.15mm lead pitch, RoHS-compliant lead-free finish. Thermal resistance θJA = 110°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse-skip enable / sync input | Pull <0.81V for forced continuous mode; accept 100–600kHz external clock; also serves as secondary feedback input. |
| fSET | Oscillator frequency programming | Resistor-to-ground sets free-running frequency; 25kΩ yields ~300kHz per datasheet Figure 1. |
| COMP | Error amplifier output | Connect RC network here to stabilize loop; high bandwidth (25MHz) enables aggressive compensation for fast load steps. |
| FB | Feedback input | Monitors VOUT via resistor divider; compared to 0.8V internal reference to regulate output voltage precisely. |
| IMAX | Current limit threshold | 12µA internal current source sets overcurrent trip point by voltage drop across bottom MOSFET during conduction. |
| INV | Mode selection | Pull >2V for boost operation; <1V for buck - reconfigures TG/BG drive logic for topology flexibility. |
| RUN/SS | Enable / soft-start control | Internal 4µA current source charges external capacitor; 0.9V threshold initiates startup; 4V clamp enables full operation. |
| GND | Analog ground reference | Primary return for internal circuits; separate from BGRTN to avoid noise coupling into gate drive paths. |
| BGRTN | Bottom gate driver return | Allows negative bias (e.g., –2V) to suppress Miller-induced shoot-through during high dV/dt SW transitions. |
| BG | Bottom gate driver output | Drives low-side N-MOSFET gate from BGRTN to DRVCC; strong 1.5–2A sink/source minimizes switching losses. |
| DRVCC | Low-side driver supply | Must be 9.3–15V; powers BG driver; bypass with 10µF X5R ceramic to BGRTN for low-impedance local energy storage. |
| VCC | Main IC supply | 9.3–15V input for core logic; bypass with ≥0.1µF ceramic to GND; UVLO triggers at 8.7V rising edge. |
| SW | Switch node connection | Connects to inductor and bootstrap capacitor; swings from Schottky drop below ground to VIN; rated –1V to 100V. |
| TG | Top gate driver output | Floating driver for high-side N-MOSFET; powered from BOOST; returns to SW node for true high-side gate control. |
| BOOST | High-side driver supply | Bypass to SW with 0.1µF X5R ceramic; charged via external Schottky from DRVCC; enables 100V-rated top-side drive. |
| VIN | High-voltage input sense | Not a power pin; feeds line feedforward circuitry to improve line regulation; withstands up to 100V continuously. |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | Uses bottom MOSFET RDS(on) voltage drop for current limiting - reduces BOM cost, board space, and conduction losses. |
| Programmable pulse-skip mode | Enables high light-load efficiency by skipping cycles when inductor current reverses - critical for 48V telecom standby power budgets. |
| Separate BGRTN pin | Allows negative bias on low-side gate return to suppress Miller-induced false turn-on - prevents shoot-through in high dV/dt applications. |
| Line feedforward compensation | Instantaneously adjusts duty cycle vs. VIN changes - eliminates overshoot/undershoot during 25V→75V input transients (Fig. 2). |
| 16-pin narrow SSOP package | Compact footprint (5.0 × 6.2 mm) with exposed pad option - supports high-density power module layouts in space-constrained base stations. |
Applications
| Telecom Power Supply | Automotive ADAS ECU |
|---|---|
Use Scenario: 48V telecom rectified input stepped down to 12V/5A for line card power. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side/low-side N-MOSFETs with 100V input tolerance. Use Value: Eliminates pre-regulator stage; achieves >90% efficiency at 75VIN/12VOUT per Fig. 1b; withstands lightning surge transients. |
Use Scenario: 12V battery input converted to 3.3V for radar processor in engine compartment. IC Role / Device Role / Timing Role: High-reliability buck controller operating across –40°C to +125°C with robust UVLO and thermal shutdown. Use Value: 125°C junction rating meets AEC-Q100 Grade 1; 50µA shutdown current extends battery life during vehicle sleep mode. |
| Industrial PLC I/O Module | Networking Switch PSU |
Use Scenario: 24–60V DC field bus powering isolated 5V/3A digital I/O banks. IC Role / Device Role / Timing Role: Voltage-mode controller with programmable frequency (250kHz) to avoid AM radio band interference. Use Value: Synchronizable to system clock; ±1% reference ensures accurate ADC reference rail generation; no RSENSE improves long-term stability. |
Use Scenario: 54V PoE++ midspan supply generating 12V for switch ASICs and PHYs. IC Role / Device Role / Timing Role: High-efficiency buck controller driving paralleled Si7456DP MOSFETs per typical application (Fig. 1). Use Value: Strong 2A gate drivers support multi-phase scaling; 100V rating accommodates 54V+10% worst-case PoE voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3779IUH#PBF | Two-phase interleaved controller; supports up to 60V VIN; includes phase shedding and current balancing. | Targeted at higher-current (>20A), lower-ripple applications where single-phase LTC3703IGN#PBF reaches thermal limits. | Select LTC3779 for multi-phase scalability; LTC3703IGN#PBF remains optimal for cost-sensitive, single-phase 5–10A designs. |
| MPQ4316-AEC1 | Integrated 100V buck converter (MOSFETs onboard); fixed 100kHz–2.5MHz frequency; AEC-Q100 Grade 1 qualified. | Replaces discrete FET + controller solution with monolithic IC; lacks programmable IMAX or BGRTN flexibility. | Choose MPQ4316-AEC1 for simplified layout and automotive qualification; retain LTC3703IGN#PBF when discrete FET selection, shoot-through mitigation, or custom current limiting is required. |
Compared with LTC3779IUH#PBF and MPQ4316-AEC1, the LTC3703IGN#PBF offers unmatched 100V standalone controller flexibility with dedicated BGRTN and IMAX programming - making it the preferred choice for thermally constrained, high-reliability single-phase buck designs where discrete MOSFET optimization is essential.
Availability
LTC3703IGN#PBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS ECUs, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3703IGN#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 support, manufacturing, and quality assurance for legacy Linear products including the LTC3703 series.
The LTC3703 product line delivers high-voltage synchronous buck control for demanding applications like 48V telecom infrastructure and automotive power systems - emphasizing precision regulation, thermal robustness, and design flexibility without integrated power stages.
FAQ
What is the maximum input voltage rating for the LTC3703IGN#PBF?
The LTC3703IGN#PBF supports up to 100V on the VIN pin, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. This allows direct step-down from 48V telecom rectified inputs or 72V automotive battery systems without pre-regulation. The SW pin is similarly rated for –1V to 100V operation, accommodating inductive ringing during switching transitions.
Does the LTC3703IGN#PBF require an external current-sense resistor?
No, the LTC3703IGN#PBF does not require an external current-sense resistor. It implements current limiting by monitoring the voltage drop across the low-side synchronous MOSFET's RDS(on), using the IMAX pin with its internal 12µA current source. This eliminates sense resistor losses and PCB area, as detailed in the Current Limit section of the datasheet.
What package type and temperature range does the LTC3703IGN#PBF use?
The LTC3703IGN#PBF uses a 16-lead narrow plastic SSOP (GN16) package with lead-free finish and is rated for operation from –40°C to +125°C junction temperature. This is explicitly stated in the Order Information table, distinguishing it from the E-grade (–40°C to +85°C) and H-grade (–40°C to +150°C) variants.
How does the LTC3703IGN#PBF achieve fast line transient response?
The LTC3703IGN#PBF achieves fast line transient response through patented line feedforward compensation, which instantaneously adjusts duty cycle in response to input voltage changes. This technique, combined with a high-bandwidth 25MHz error amplifier, minimizes output voltage deviation during large VIN steps - as demonstrated in Figure 2 showing minimal overshoot during 25V→60V transients.
Can the LTC3703IGN#PBF be used in boost configuration?
Yes, the LTC3703IGN#PBF supports boost operation via the INV pin: pulling INV above 2V reconfigures TG and BG drive logic to operate as a step-up controller, enabling regulated outputs up to 80V. This dual-mode capability is documented in the Buck or Boost Mode Operation section and functional diagram, confirming topology flexibility beyond standard buck use cases.
LTC3703IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 9.3V ~ 15V
- Frequency - Switching:
- 100kHz ~ 600kHz
- Duty Cycle (Max):
- 93%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3703IGN#PBF FAQ
1.How can I place an order for LTC3703IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703IGN#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 LTC3703IGN#PBF reliable?
The price and inventory of LTC3703IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3703IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703IGN#PBF?
LTC3703IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703IGN#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 LTC3703IGN#PBF?
For technical support, including LTC3703IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703IGN#PBF requirements.
6.How does Aetrix verify that LTC3703IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3703IGN#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 LTC3703IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3703IGN#PBF?
All LTC3703IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703IGN#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 LTC3703IGN#PBF part is unused and in its original packaging.
Return procedure for LTC3703IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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