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Analog Devices Inc. LTC3703EG#PBF
- Part No.:
- LTC3703EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3703EG#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:156
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Product details
Overview
LTC3703EG#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 eliminates current-sense resistors via MOSFET RDS(on) sensing - ideal for telecom power supplies and automotive high-voltage DC/DC conversion.
For engineers reviewing the LTC3703EG#PBF datasheet, LTC3703EG#PBF pinout, LTC3703EG#PBF application, or LTC3703EG#PBF equivalent, key selection considerations include its 100V input capability, gate drive strength (1.5A peak, 1Ω pull-down), no-RSENSE current limiting, line feedforward compensation for fast transient response, and 28-pin SSOP package with dedicated BGRTN pin for Miller-effect mitigation.
Technical Context
The LTC3703EG#PBF implements a constant-frequency, voltage-mode control loop with a 25MHz error amplifier and patented line feedforward compensation, enabling sub-µs line transient recovery without slope compensation. Its oscillator supports resistor programming (100–600kHz) or external synchronization up to 600kHz, with automatic pulse-skip disable upon sync lock.
It features dual independent gate drivers: a floating 100V-capable top driver (TG) powered from BOOST/SW, and a low-side driver (BG) referenced to BGRTN - allowing negative biasing to suppress false turn-on during high dV/dt at SW. Current limit is set via IMAX pin (12µA internal source) using one resistor, comparing VDS of the bottom MOSFET against a user-defined threshold.
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% over temperature - ensures stable regulation for precision 12V or 5V point-of-load supplies. |
| Switching Frequency | 100–600kHz programmable - balances inductor size, efficiency, and EMI filtering requirements. |
| Gate Drive Strength | 1.5A peak source / 1Ω pull-down RDS(on) - supports parallel MOSFETs and fast slew rates for <100ns transitions. |
| Current Limit Sensing | No external sense resistor required - uses bottom MOSFET VDS with 50mV instantaneous comparator and gm-based steady-state regulation. |
| Shutdown Current | 50µA typical - minimizes standby power in always-on automotive or network infrastructure systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and commercial telecom base station environments. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G Package), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 28) | Top gate driver supply | Provides floating bias for TG driver; must be bypassed to SW with 0.1µF X5R ceramic capacitor. |
| TG (Pin 27) | Top N-channel MOSFET gate driver | Drives gate of high-side switch; swing range = BOOST to SW - enables true high-side synchronous operation. |
| SW (Pin 26) | Switch node connection | Connects to inductor and BOOST capacitor; voltage swings from –0.3V to VIN - requires Schottky catch diode or synchronous rectifier. |
| DRVCC (Pin 20) | Bottom gate driver supply | Supplies BG driver; 9.3–15V range - powers low-side gate drive independently of VCC. |
| BG (Pin 19) | Bottom N-channel MOSFET gate driver | Drives gate of synchronous rectifier; swing range = BGRTN to DRVCC - supports negative bias on BGRTN to suppress Miller-induced shoot-through. |
| BGRTN (Pin 15) | Bottom gate return reference | Dedicated return path for BG driver; allows connection to –2V or similar to clamp gate voltage during high dV/dt events. |
| VIN (Pin 1) | High-voltage input sense | Connects directly to input rail up to 100V; feeds line feedforward circuitry - not a power supply pin. |
| VCC (Pin 21) | Main logic supply | 9.3–15V supply for internal circuits (excluding drivers); bypassed to GND with ≥0.1µF ceramic capacitor. |
| RUN/SS (Pin 13) | Enable and soft-start control | Pull below 0.9V for shutdown (50µA IQ); internal 4µA current source charges external capacitor for controlled startup. |
| IMAX (Pin 10) | Current limit threshold set | 12µA internal current source sets trip point via single resistor to ground - enables precise, resistor-programmed OCP. |
| FB (Pin 9) | Feedback input | Compares output voltage (via resistor divider) against 0.792–0.812V internal reference - sets regulated output voltage. |
| COMP (Pin 8) | Error amplifier output | Connects to RC compensation network between COMP and FB - determines loop stability and transient response. |
| fSET (Pin 7) | Oscillator frequency set | Resistor-to-ground sets free-running frequency (100–600kHz); enables optimization of magnetics and EMI performance. |
| MODE/SYNC (Pin 6) | Mode select / external sync input | Pull <0.81V for forced continuous mode; apply external clock 100–600kHz for noise-sensitive applications. |
| INV (Pin 11) | Topology select | Pull >2V for boost mode (TG drives main switch); <1V for buck mode (TG drives high-side, BG drives synchronous rectifier). |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | Uses bottom MOSFET RDS(on) as current-sense element - reduces BOM cost, PCB area, and power loss vs. discrete shunt. |
| Patented line feedforward compensation | Instantaneously adjusts duty cycle to input voltage changes - achieves <100ns line transient recovery with minimal output deviation. |
| Dedicated BGRTN pin | Enables negative biasing of bottom gate driver return - prevents false turn-on caused by Miller capacitance coupling during high dV/dt at SW node. |
| Programmable pulse-skip mode | Disables bottom MOSFET when inductor current reverses - improves light-load efficiency by eliminating reverse conduction losses. |
| 100V input-rated switch node | SW pin rated to 100V with 20ns transient allowance - supports robust operation in 48V telecom and 60V+ automotive systems. |
| Integrated undervoltage lockout | VCC UVLO thresholds at 8.7V (rising) and 6.2V (falling) - prevents erratic operation during brown-out or startup sequencing. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power System |
|---|---|
Use Scenario: Converting 48V intermediate bus to isolated 12V/5V rails for baseband processors and RF transceivers in 5G small cells. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-reliability DC/DC conversion with tight line regulation under dynamic load steps. Use Value: 100V input rating avoids need for cascaded converters; line feedforward ensures <±1% output deviation during 20V input transients. |
Use Scenario: Generating 5V/3.3V from 12V/24V vehicle battery for camera modules, radar sensors, and domain controllers in autonomous driving systems. IC Role / Device Role / Timing Role: High-voltage synchronous buck controller providing stable, low-noise power with programmable soft-start and fault protection. Use Value: BGRTN pin enables –2V bias to prevent shoot-through during cranking transients (–12V to +20V battery dips); 50µA shutdown current extends battery life. |
| Industrial Motor Drive Auxiliary Supply | Networking Equipment Mid-Board Converter |
Use Scenario: Deriving 15V gate drive and 5V logic rails from 60–80V DC link in servo inverters and PLC power stages. IC Role / Device Role / Timing Role: Robust high-input-voltage controller supporting wide VIN range and operating up to 85°C ambient. Use Value: 1.5A gate drivers support paralleled MOSFETs for >20A output; programmable frequency avoids EMI bands in noisy factory environments. |
Use Scenario: Stepping down 48V PoE++ or 54V mid-span supply to 12V for switch ASICs and PHYs in enterprise switches and routers. IC Role / Device Role / Timing Role: Synchronous buck controller delivering high efficiency (>92% at 5A) and fast load transient response for bursty data traffic loads. Use Value: 25MHz error amplifier and optimized compensation enable <50µs load step recovery; no-RSENSE design preserves efficiency at full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3779EUF#PBF | 4-phase interleaved controller; supports up to 60V VIN; includes phase shedding and digital interface. | Targeted at higher-current (>30A), lower-ripple applications requiring multiphase coordination. | Select LTC3779EUF#PBF only when multi-phase operation, digital monitoring, or tighter ripple specs are required - not a drop-in replacement. |
| LM5116MH/NOPB | 100V capable; current-mode control; requires external current-sense resistor; no BGRTN pin or line feedforward. | Suitable for cost-sensitive designs where ±2% accuracy and slower line response are acceptable. | Choose LM5116MH/NOPB for simpler BOM and legacy current-mode familiarity - but expect reduced line transient performance and added sense resistor loss. |
Compared with LTC3703EG#PBF, the LTC3779EUF#PBF offers multiphase scalability at the expense of complexity and cost, while the LM5116MH/NOPB trades feedforward-enhanced line regulation and no-RSENSE simplicity for broader vendor availability and current-mode familiarity - neither matches LTC3703EG#PBF's combination of 100V capability, voltage-mode speed, and integrated shoot-through mitigation.
Availability
LTC3703EG#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS subsystems, and industrial motor drive auxiliary rails requiring stable component supply across extended temperature and high-reliability lifecycles.
Supply support for LTC3703EG#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 product support, datasheets, and application engineering for all Linear ICs including the LTC3703 series.
The LTC3703 belongs to Linear's high-voltage DC/DC controller family, designed specifically for efficient, reliable step-down conversion from 48V–100V inputs in telecom, automotive, and industrial infrastructure - emphasizing no-RSENSE operation, fast transient response, and robust gate drive.
FAQ
What is the maximum input voltage rating for the LTC3703EG#PBF?
The LTC3703EG#PBF supports a maximum input voltage of 100V on the VIN pin, with the SW pin rated to withstand up to 100V (with 20ns transient allowance). This enables direct conversion from 48V telecom buses and 72V automotive systems without pre-regulation stages. Absolute maximum ratings specify VIN and SW at –0.3V to 100V, and BOOST at –0.3V to 115V - all verified per Linear Technology's 3703fc datasheet.
Does the LTC3703EG#PBF require an external current-sense resistor?
No, the LTC3703EG#PBF does not require an external current-sense resistor. It implements no-RSENSE current limiting by monitoring the voltage drop across the bottom N-channel MOSFET's RDS(on) during conduction. The IMAX pin uses a 12µA internal current source and a single external resistor to ground to set the current limit threshold, eliminating power loss and board space associated with shunt resistors.
How does the BGRTN pin improve reliability in high-dV/dt applications?
The BGRTN pin on the LTC3703EG#PBF provides a dedicated return path for the bottom gate driver, enabling connection to a negative bias (e.g., –2V) to counteract Miller-effect-induced false turn-on during rapid SW node transitions. This prevents shoot-through between top and bottom MOSFETs - a critical reliability feature in automotive and industrial systems with high-voltage transients. The functional diagram and Applications Information section of the LTC3703 datasheet confirm this design intent.
Can the LTC3703EG#PBF operate in boost configuration?
Yes, the LTC3703EG#PBF supports both buck and boost topologies. When the INV pin is pulled above 2V, it configures the controller for step-up operation - with TG driving the main switch and BG driving the synchronous rectifier - enabling regulated outputs up to 80V. This dual-mode capability is explicitly documented in the "Buck or Boost Mode Operation" section of the LTC3703 datasheet (page 12), and confirmed by the pin function description for INV.
What is the purpose of the MODE/SYNC pin on the LTC3703EG#PBF?
The MODE/SYNC pin on the LTC3703EG#PBF serves two functions: enabling pulse-skip mode (when pulled >0.81V) or forced continuous conduction mode (when pulled <0.75V), and accepting an external synchronization clock (100–600kHz) to align switching frequency with system timing requirements. When synchronized, pulse-skip mode is automatically disabled - ensuring deterministic EMI behavior in noise-sensitive applications like medical or test equipment.
LTC3703EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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:
- 28-SSOP
LTC3703EG#PBF FAQ
1.How can I place an order for LTC3703EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EG#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 LTC3703EG#PBF reliable?
The price and inventory of LTC3703EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703EG#PBF is usually 5 days.
3.What payment methods are accepted for LTC3703EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EG#PBF?
LTC3703EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EG#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 LTC3703EG#PBF?
For technical support, including LTC3703EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EG#PBF requirements.
6.How does Aetrix verify that LTC3703EG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EG#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 LTC3703EG#PBF meets industry standards.
7.What is the process for return or replacement of LTC3703EG#PBF?
All LTC3703EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EG#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 LTC3703EG#PBF part is unused and in its original packaging.
Return procedure for LTC3703EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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