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Analog Devices Inc. LTC3703EGN#PBF
- Part No.:
- LTC3703EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703EGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
LTC3703EGN#PBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-down switching regulator controller with voltage-mode architecture, ±1% reference accuracy, programmable 100–600kHz switching frequency, and dual N-channel MOSFET gate drive. It operates without a current sense resistor by sensing the bottom FET's RDS(on) voltage drop and supports automotive and telecom power supplies up to 100V input.
For engineers reviewing the LTC3703EGN#PBF datasheet, LTC3703EGN#PBF pinout, LTC3703EGN#PBF application, or LTC3703EGN#PBF equivalent, key selection criteria include high-voltage VIN capability (100V), gate driver strength (2A peak, 1Ω pull-down), line feedforward compensation for fast transient response, and programmable current limit via IMAX pin - all critical for robust high-input-voltage DC/DC design.
Technical Context
The LTC3703EGN#PBF implements a constant-frequency voltage-mode control loop with a 25MHz error amplifier and patented line feedforward compensation, enabling rapid line and load transient response without external compensation complexity. Its oscillator supports both resistor-programmed operation (100–600kHz) and external synchronization within the same range.
It features dual independent gate drivers: a floating high-side TG driver powered from BOOST/SW (capable of 100V swing) and a low-side BG driver referenced to BGRTN, with programmable undervoltage lockout (8.7V VCC UV+), soft-start via RUN/SS capacitor, and cycle-by-cycle current limiting using the bottom MOSFET's VDS as the current sense element.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage (VIN) | 100V - enables direct conversion from telecom -48V nominal (up to 72V) or automotive transients without pre-regulation |
| Reference Accuracy | ±1% - ensures tight output voltage regulation across temperature and line/load conditions |
| Switching Frequency Range | 100–600kHz - balances efficiency, inductor size, and EMI filtering requirements |
| Gate Driver Strength | 2A peak source / 1Ω pull-down RDS(on) - supports parallel MOSFETs and fast slew rates for high-current designs |
| Current Limit Sensing | No external sense resistor required - uses bottom MOSFET VDS with 12µA IMAX bias for programmable threshold |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and automotive under-hood applications |
| Shutdown Current | 50µA typical - minimizes standby power loss in always-on systems |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN16), RoHS-compliant lead-free finish, 0.65mm pitch, JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse-skip enable / sync input | Below 0.81V forces continuous mode; above 0.87V enables pulse-skip; accepts external clock up to 600kHz |
| fSET | Oscillator frequency set | Resistor-to-ground sets free-running frequency (100–600kHz); no capacitor needed |
| COMP | Error amplifier output | Connect RC network here to stabilize voltage-mode loop and optimize transient response |
| FB | Feedback input | Monitors output via resistor divider; compared to 0.792–0.812V internal reference for regulation |
| IMAX | Current limit threshold | 12µA internal current source sets limit via single resistor to ground; senses bottom FET VDS |
| INV | Mode select (buck/boost) | <1V = buck mode (TG = top switch); >2V = boost mode (TG = synchronous rectifier) |
| RUN/SS | Enable / soft-start | Pull <0.9V shuts down IC; internal 4µA current charges CSS for controlled VOUT ramp-up |
| GND | Analog ground | Reference for internal circuits; separate from power ground paths to minimize noise coupling |
| VIN | High-voltage input sense | Not a supply pin - feeds line feedforward path to improve line regulation and transient immunity |
| BOOST | Floating high-side supply | Bypassed to SW with 0.1µF ceramic; powers TG driver via charge-pump topology |
| TG | Top gate driver output | Drives gate of high-side N-MOSFET; swings from SW to BOOST; requires bootstrap capacitor |
| SW | Switch node | Connection point for inductor, bootstrap diode, and Schottky catch diode; sees full VIN swing |
| VCC | Main logic supply | 9.3–15V input for internal circuitry; bypassed to GND with ≥0.1µF ceramic |
| DRVCC | Low-side driver supply | 9.3–15V supply for BG driver; bypassed to BGRTN with 10µF low-ESR ceramic |
| BG | Bottom gate driver output | Drives gate of synchronous rectifier; swings from BGRTN to DRVCC |
| BGRTN | Bottom gate return | Separate return for BG driver; allows negative bias to suppress Miller-induced shoot-through |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor | Eliminates power loss and board space for shunt; uses bottom MOSFET RDS(on) as intrinsic current sensor |
| Line feedforward compensation | Compensates for input voltage changes in real time, reducing output overshoot/undershoot during line transients |
| Programmable pulse-skip mode | Improves light-load efficiency by disabling bottom FET when inductor current reverses - no reverse conduction loss |
| 16-pin narrow SSOP package | Compact footprint (5.0 × 6.0 mm) with thermal pad option; compatible with standard reflow and automated assembly |
| Undervoltage lockout (UVLO) | Hysteresis-enabled (8.0V/8.7V thresholds) prevents erratic startup during brown-out conditions |
| Soft-start with internal current source | 4µA RUN/SS pull-up enables precise, capacitor-defined ramp time without external components |
Applications
| Telecom Power Supply | Automotive ADAS Power |
|---|---|
Use Scenario: 48V telecom base station power conversion to 12V intermediate bus. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating high-voltage input with fast line transient response. Use Value: Direct 100V VIN support eliminates pre-regulator stage; line feedforward maintains <±1% VOUT during 25V→75V input steps. |
Use Scenario: Front-end power for radar modules in 12V/24V automotive systems with load dump immunity. IC Role / Device Role / Timing Role: High-reliability step-down controller driving parallel MOSFETs for >5A output. Use Value: 100V absolute max rating withstands ISO 7637-2 Pulse 5a (120V transient); 2A gate drivers ensure fast switching at 300kHz. |
| Industrial PLC I/O Power | Networking Equipment DC/DC |
Use Scenario: Isolated 24V field bus power converted to 5V/3.3V for digital I/O modules. IC Role / Device Role / Timing Role: Non-isolated buck controller with programmable current limit for short-circuit protection. Use Value: IMAX-based current limiting avoids external sense resistor drift; –40°C to +85°C rating ensures operation in uncontrolled cabinets. |
Use Scenario: Mid-rail generation in 1U servers converting 48V backplane to 12V CPU/memory rails. IC Role / Device Role / Timing Role: High-efficiency synchronous controller synchronized to system clock to reduce EMI. Use Value: MODE/SYNC pin enables external clock synchronization up to 600kHz, allowing deterministic noise placement away from sensitive bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3779EFE#PBF | 4-phase interleaved controller; supports up to 60V VIN; includes phase shedding and digital interface | Targeted at high-current (>30A), low-ripple server/ASIC rails - not single-phase replacement | Select only when multi-phase architecture and PMBus control are required; not pin-compatible |
| MP24894GQ-Z | Monolithic 100V buck converter (integrated MOSFETs); fixed 500kHz fSW; no IMAX or line feedforward | Suitable for lower-current (<6A), cost-sensitive designs where layout simplicity outweighs performance tuning | Choose for BOM reduction and smaller footprint; sacrifices programmability and transient performance of LTC3703EGN#PBF |
Compared with LTC3779EFE#PBF and MP24894GQ-Z, the LTC3703EGN#PBF uniquely delivers programmable 100–600kHz operation, line feedforward compensation, and resistor-based current limit in a discrete-driver architecture - making it optimal for high-performance, high-input-voltage, single-phase buck designs requiring design flexibility and transient robustness.
Availability
LTC3703EGN#PBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive ADAS subsystems, and industrial PLC I/O modules requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LTC3703EGN#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 its high-performance analog and power management portfolio with rigorous qualification standards.
The LTC3703EGN#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for robust, efficient DC/DC conversion in harsh environments including telecom infrastructure and automotive power systems.
FAQ
What is the maximum input voltage rating for the LTC3703EGN#PBF?
The LTC3703EGN#PBF has an absolute maximum input voltage rating of 100V on the VIN pin, with guaranteed operation up to 100V under specified conditions. This enables direct use in 48V telecom systems with transient margins and 24V automotive applications with load dump protection. The device's internal feedforward compensation maintains regulation stability even during large VIN steps such as 25V to 75V, as verified in Figure 2 of the datasheet.
Does the LTC3703EGN#PBF require an external current sense resistor?
No, the LTC3703EGN#PBF does not require an external current sense resistor. It implements current limiting by monitoring the voltage drop across the bottom N-channel MOSFET's RDS(on) during conduction. The IMAX pin provides a 12µA internal current source, allowing users to set the current limit threshold with a single resistor to ground - eliminating power loss, board area, and tolerance drift associated with shunt resistors.
What package type and temperature grade does the LTC3703EGN#PBF use?
The LTC3703EGN#PBF uses a 16-lead narrow plastic SSOP (GN16) package with lead-free finish and is rated for operation from –40°C to +85°C. This temperature grade (E-grade) is validated per Linear Technology's industrial qualification standards and includes thermal metrics such as θJA = 110°C/W. The part marking "3703" appears on the top surface of the device.
How is the switching frequency programmed on the LTC3703EGN#PBF?
The switching frequency of the LTC3703EGN#PBF is programmed using a resistor connected from the fSET pin to ground. A 25kΩ resistor sets the nominal frequency to 300kHz, and values between ~8.2kΩ (600kHz) and ~150kΩ (100kHz) achieve the full 100–600kHz range. No capacitor is required. Alternatively, the internal oscillator can be synchronized to an external clock applied to the MODE/SYNC pin, supporting lock-in from 100kHz to 600kHz.
Can the LTC3703EGN#PBF operate in boost configuration?
Yes, the LTC3703EGN#PBF supports boost mode operation via the INV pin: pulling INV above 2V configures the controller for step-up topology, where TG drives the synchronous rectifier and BG drives the main switch. In this mode, it can regulate output voltages up to 80V. However, the LTC3703EGN#PBF datasheet emphasizes buck operation as the primary use case, and boost-mode performance (e.g., efficiency, transient response) is not characterized to the same extent as buck mode.
LTC3703EGN#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3703EGN#PBF FAQ
1.How can I place an order for LTC3703EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EGN#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 LTC3703EGN#PBF reliable?
The price and inventory of LTC3703EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3703EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EGN#PBF?
LTC3703EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EGN#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 LTC3703EGN#PBF?
For technical support, including LTC3703EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EGN#PBF requirements.
6.How does Aetrix verify that LTC3703EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EGN#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 LTC3703EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3703EGN#PBF?
All LTC3703EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EGN#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 LTC3703EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3703EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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