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Analog Devices Inc. LTC3703EGN#TRPBF
- Part No.:
- LTC3703EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,450
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Product details
Overview
LTC3703EGN#TRPBF 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 capability-designed for telecom power supplies, automotive high-voltage DC/DC conversion, and industrial 48V systems.
For engineers reviewing the LTC3703EGN#TRPBF datasheet, LTC3703EGN#TRPBF pinout, LTC3703EGN#TRPBF application, or LTC3703EGN#TRPBF equivalent, key selection criteria include its 100V input rating, no-current-sense-resistor operation via synchronous MOSFET RDS(on) sensing, 1Ω gate drivers, programmable current limit, and -40°C to +85°C operating range in 16-lead narrow SSOP.
Technical Context
The LTC3703EGN#TRPBF implements voltage-mode control with patented line feedforward compensation, enabling fast line transient response without external compensation. 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 independent gate drivers: TG delivers 1.5–2A peak source current with floating bootstrap supply (up to 115V), while BG provides 1.5–2A peak source current referenced to BGRTN, with 1Ω pull-down RDS(on). Current limiting uses cycle-by-cycle comparator (50mV threshold) plus gm-amplifier-based steady-state regulation via RUN/SS discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 100V - enables direct conversion from telecom -48V nominal (with margin) or automotive 72V transients without pre-regulator |
| Reference Accuracy | ±1% - ensures output voltage stability across temperature and line/load variations without trimming |
| Switching Frequency | 100–600kHz programmable - balances inductor size, efficiency, and EMI filtering requirements |
| Gate Driver Strength | 1.5–2A peak, 1Ω RDS(on) - supports paralleling of multiple MOSFETs and fast slew rates for <10ns rise/fall times |
| Current Sense Method | Voltage drop across bottom MOSFET - eliminates sense resistor losses and PCB area, improves efficiency at high currents |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive under-hood environments with derated lifetime above 125°C junction |
| Shutdown Current | 50µA typical - enables low-power standby modes in battery-backed or energy-sensitive systems |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN16), 0.15mm pitch, exposed pad not present, JEDEC MS-013AC compliant. Thermal resistance θJA = 110°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse-skip enable / sync input | Below 0.8V forces continuous conduction; above 0.8V enables pulse-skip; accepts external 100–600kHz clock for EMI control |
| fSET | Oscillator frequency set | 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) allows aggressive compensation for fast load steps |
| FB | Feedback input | Compares output divider voltage to 0.8V internal reference; ±0.05% line/load regulation supports precision regulation |
| IMAX | Current limit threshold | 12µA internal current source sets limit via single resistor; senses VDS of bottom MOSFET instead of shunt |
| INV | Mode select (buck/boost) | Below 1V configures buck mode (TG=top switch); above 2V configures boost mode (TG=bottom switch) |
| RUN/SS | Enable / soft-start | Below 0.9V shuts down IC; internal 4µA current charges CSS for controlled VOUT ramp with no overshoot |
| GND | Analog ground | Reference for FB, COMP, IMAX, RUN/SS; separate from power grounds to minimize noise coupling |
| BGRTN | Bottom gate return | Allows negative bias (e.g., -2V) to suppress Miller-induced shoot-through during high dV/dt SW transitions |
| BG | Bottom gate driver | Drives synchronous MOSFET source-to-BGRTN; swing = BGRTN to DRVCC (9.3–15V) |
| DRVCC | Driver supply | Power for BG driver only; bypass with 10µF X5R ceramic to BGRTN for low-impedance local supply |
| VCC | Main supply | Powers all analog/oscillator/logic circuits (9.3–15V); bypass with ≥0.1µF ceramic to GND |
| SW | Switch node | Connects to inductor and BOOST capacitor; voltage swings from Schottky drop below GND to VIN (≤100V) |
| TG | Top gate driver | Floating driver powered by BOOST; swing = SW to BOOST (up to 115V); drives top N-MOSFET gate |
| BOOST | Top gate supply | Bypassed to SW with 0.1µF X5R; charged via external Schottky from DRVCC to sustain floating drive |
| VIN | Input voltage sense | Not a supply pin; feeds line feedforward circuitry to improve line regulation and transient response |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(on) as current sensor - eliminates 2–5% conduction loss and PCB space of shunt resistor |
| Programmable pulse-skip mode | Enables >90% efficiency at light loads (e.g., <10% full scale) by skipping cycles instead of forced continuous operation |
| Patented line feedforward compensation | Instantly adjusts duty cycle on input voltage transients - reduces output deviation to <1% during 25V→75V steps (Fig. 2) |
| 16-pin narrow SSOP package | Compact footprint (5.0 × 6.2 mm) with 0.15mm pitch - suitable for dense telecom and automotive PCB layouts |
| Undervoltage lockout (UVLO) | 8.7V turn-on / 6.2V turn-off hysteresis - prevents erratic operation during brown-out or startup with unregulated inputs |
| Soft-start with internal current source | 4µA constant current charges external capacitor - enables precise, overshoot-free VOUT ramp time (e.g., 750ms/µF) |
Applications
| Telecom Power Supply | Automotive High-Voltage DC/DC |
|---|---|
Use Scenario: 48V telecom rectifier output stepped down to 12V for base station radios and backhaul equipment. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing up to 100V input transients and delivering 5A continuous output. Use Value: Eliminates pre-regulator stage, reduces BOM count by removing current sense resistor, and maintains ±1% output accuracy over -40°C to +85°C. |
Use Scenario: 24V/48V vehicle battery (with 80V load dump) converted to stable 5V/3.3V for ADAS ECUs and infotainment processors. IC Role / Device Role / Timing Role: High-reliability step-down controller with robust UVLO, thermal shutdown, and fast line transient response. Use Value: Withstands ISO 7637-2 pulse 5a (87V/100ms) without latch-up; 100V rating avoids costly discrete clamp networks. |
| Industrial 48V System Power | Networking Equipment Midplane |
Use Scenario: Factory automation PLCs requiring isolated 24V and 5V rails from unregulated 48V PoE++ or battery backup. IC Role / Device Role / Timing Role: Main non-isolated buck controller driving Si7456DP MOSFETs in high-efficiency, low-noise configuration. Use Value: Programmable 300kHz frequency enables optimal tradeoff between efficiency (92% @ 5A) and EMI filter size in space-constrained enclosures. |
Use Scenario: Data center switch midplane supplying 12V to line cards from centralized 48V distribution bus. IC Role / Device Role / Timing Role: High-current synchronous controller supporting parallel MOSFETs and synchronized switching to reduce system-level ripple. Use Value: Synchronization input (MODE/SYNC) aligns switching edges across multiple LTC3703EGN#TRPBF units, minimizing aggregate input ripple current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#TRPBF | Integrated 6A power switches, 60V max input, spread-spectrum EMI reduction, requires external current sense resistor | Better for compact, medium-power designs where integration outweighs input voltage headroom needs | Select when board space is critical and 60V input suffices; avoid if 100V transient immunity is mandatory |
| MPQ4316-AEC1-LF-P | Automotive-grade (AEC-Q100), 65V max input, integrated MOSFETs, fixed 400kHz frequency, no sync input | Targeted for ASIL-B automotive subsystems needing qualification, not telecom or industrial 100V systems | Choose for automotive infotainment or body control modules; not suitable for telecom -48V or industrial 72V applications |
Compared with LT8390A and MPQ4316, the LTC3703EGN#TRPBF uniquely supports 100V input with external MOSFET flexibility, no current sense resistor, and synchronization capability-making it irreplaceable for high-reliability, high-input-voltage buck designs requiring design longevity and thermal robustness.
Availability
LTC3703EGN#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive high-voltage DC/DC converters, and industrial 48V system power requiring stable component supply, long lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3703EGN#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3703EGN#TRPBF belongs to Linear's high-voltage controller product line, engineered specifically for ruggedized DC/DC conversion in telecom infrastructure, automotive power systems, and industrial equipment where input voltages exceed 60V.
FAQ
What is the maximum input voltage rating for the LTC3703EGN#TRPBF?
The LTC3703EGN#TRPBF supports a maximum input voltage of 100V on the VIN pin, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. This rating applies across the full -40°C to +85°C operating temperature range and enables direct use with telecom -48V systems (including 100V transients) and automotive 24V/48V architectures with load dump protection. Exceeding 100V risks permanent damage per datasheet Note 1.
Does the LTC3703EGN#TRPBF require an external current sense resistor?
No, the LTC3703EGN#TRPBF does not require an external current sense resistor. It implements current limiting by sensing the voltage drop across the bottom synchronous MOSFET's RDS(on), using the IMAX pin with a single external resistor to ground. This method eliminates power loss and PCB area associated with shunt resistors, as explicitly stated in the Features section and verified in the Current Limit section of the datasheet.
What package type and temperature range does the LTC3703EGN#TRPBF use?
The LTC3703EGN#TRPBF uses a 16-lead narrow plastic SSOP (GN16) package with operating temperature range of -40°C to +85°C. This is confirmed in the Order Information table, where "LTC3703EGN#TRPBF" maps to "E grade", "16-Lead Narrow Plastic SSOP", and "–40°C to 85°C". The package has θJA = 110°C/W and JEDEC MS-013AC mechanical dimensions.
Can the LTC3703EGN#TRPBF operate in boost mode?
Yes, the LTC3703EGN#TRPBF can operate in boost mode by applying >2V to the INV pin, which reconfigures TG as the bottom switch and BG as the top switch. The datasheet confirms this capability in the Buck or Boost Mode Operation section and specifies up to 80V regulated output in boost configuration. However, the LTC3703EGN#TRPBF variant is optimized and characterized for buck operation; boost performance depends on external component selection and layout.
What is the purpose of the BGRTN pin on the LTC3703EGN#TRPBF?
The BGRTN pin on the LTC3703EGN#TRPBF serves as the dedicated return path for the bottom gate driver (BG), allowing connection to a negative supply (e.g., -2V) to suppress Miller-induced false turn-on of the bottom MOSFET during high dV/dt transitions at the SW node. This feature is documented in Pin Functions and Applications Information sections, and is critical for reliable operation with fast-switching, high-side-referenced synchronous rectifiers.
LTC3703EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3703EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EGN#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 LTC3703EGN#TRPBF reliable?
The price and inventory of LTC3703EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EGN#TRPBF?
LTC3703EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EGN#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 LTC3703EGN#TRPBF?
For technical support, including LTC3703EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3703EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EGN#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 LTC3703EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703EGN#TRPBF?
All LTC3703EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EGN#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 LTC3703EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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