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Analog Devices Inc. LTC3703EG#TRPBF
- Part No.:
- LTC3703EG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3703EG#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,023
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Product details
Overview
LTC3703EG#TRPBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-down switching regulator controller driving external N-channel MOSFETs in voltage-mode architecture. It delivers ±1% DC output accuracy, programmable 100–600kHz switching frequency, and eliminates current-sense resistors by sensing VDS across the bottom MOSFET. It is used in telecom power supplies, automotive high-voltage DC/DC conversion, and industrial 48V–75V input systems.
For engineers reviewing the LTC3703EG#TRPBF datasheet, LTC3703EG#TRPBF pinout, LTC3703EG#TRPBF application, or LTC3703EG#TRPBF equivalent, key selection criteria include its 100V VIN capability, dual N-MOSFET synchronous drive, gate driver strength (1.5A peak, 1Ω RDS(ON)), line feedforward compensation for fast transient response, and programmable current limit with no external sense resistor.
Technical Context
The LTC3703EG#TRPBF implements voltage-mode control with a 25MHz error amplifier and patented line feedforward compensation, enabling rapid line and load transient response without current-sense components. Its oscillator supports user-programmed frequency (100–600kHz) or external synchronization up to 600kHz, and pulse-skip mode improves light-load efficiency.
It features dual independent gate drivers: TG provides floating high-side drive (up to 100V swing) powered via BOOST/SW bootstrap, while BG drives the low-side MOSFET referenced to BGRTN - configurable with negative bias to suppress Miller-induced shoot-through. The IMAX pin integrates a 12µA current source for single-resistor current limit programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage (VIN) | 100V - enables direct step-down from telecom -48V phantom, 72V automotive, or industrial 96V bus without pre-regulator |
| Feedback Reference Voltage | 0.792–0.812V (±1%) - supports precise regulation of outputs as low as 0.8V with minimal external divider error |
| Switching Frequency Range | 100–600kHz - balances inductor size, efficiency, and EMI; synchronizable to external clock for noise-sensitive systems |
| Gate Driver Strength | 1.5A peak source / 1Ω pull-down RDS(ON) - drives multiple parallel MOSFETs or high-Qg devices with fast slew rates |
| Current Limit Sensing | VDS-based bottom-FET sensing - eliminates power loss and board space of discrete current-sense resistor |
| Operating Temperature Range | –40°C to +85°C - qualified for commercial/industrial environments; junction max 125°C |
| Shutdown Current | 50µA typical - minimizes standby power in always-on systems such as remote monitoring nodes |
Pinout & Package
Package: 28-Lead Plastic SSOP (G Package), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (Pin 6) | Multifunction control input | Enables pulse-skip mode (>0.81V) or forces continuous operation/sync (<0.75V); also accepts external clock up to 600kHz |
| fSET (Pin 7) | Oscillator frequency programming | Resistor-to-ground sets free-running frequency from 100kHz to 600kHz; determines inductor/capacitor sizing |
| COMP (Pin 8) | Error amplifier output | Connects RC compensation network to stabilize loop; high bandwidth (25MHz) enables aggressive transient response |
| FB (Pin 9) | Output voltage feedback | Monitors regulated output via resistor divider; compared to internal 0.8V reference for closed-loop control |
| IMAX (Pin 10) | Current limit threshold | 12µA internal current source sets overcurrent trip point using single resistor to ground; senses VDS of bottom MOSFET |
| INV (Pin 11) | Mode select (buck/boost) | Pull >2V for boost mode (TG = main switch); <1V for buck mode (TG = top switch, BG = sync switch) |
| RUN/SS (Pin 13) | Enable & soft-start control | Pull <0.9V shuts down IC (50µA IQ); capacitor to ground controls ramp rate and prevents output overshoot |
| GND (Pin 14) | Analog ground reference | Primary return for internal circuits; separate from power grounds to minimize noise coupling into feedback path |
| BGRTN (Pin 15) | Bottom gate driver return | Separate return allows negative bias (e.g., –2V) to counteract Miller-induced false turn-on during high dV/dt at SW node |
| BG (Pin 19) | Bottom gate driver output | Drives source-connected N-MOSFET; swings from BGRTN to DRVCC; integrated 1Ω pull-down prevents shoot-through |
| DRVCC (Pin 20) | Low-side driver supply | Provides 9.3–15V power to BG driver; bypassed to BGRTN with ≥10µF X5R ceramic capacitor |
| VCC (Pin 21) | Main logic supply | Powers internal circuitry (error amp, oscillator, logic); requires 9.3–15V low-noise supply bypassed to GND with ≥0.1µF ceramic |
| SW (Pin 26) | Switch node connection | Connects to inductor and bootstrap capacitor; voltage swings from ~–0.3V (Schottky drop) to VIN |
| TG (Pin 27) | Top gate driver output | Floating driver for high-side N-MOSFET; powered from BOOST, returns to SW; enables true high-side switching |
| BOOST (Pin 28) | High-side driver supply | Charged via external Schottky diode from DRVCC; bypassed to SW with 0.1µF X5R ceramic for stable floating rail |
| VIN (Pin 1) | High-voltage input sense | Connects directly to input rail; feeds line feedforward path - not a power supply pin |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | VDS-based current limit sensing on bottom MOSFET eliminates power loss, PCB area, and thermal drift errors of shunt resistors |
| Patented line feedforward compensation | Instantaneous duty-cycle adjustment to input voltage transients - reduces output deviation to <1% during 25V→75V steps |
| Programmable pulse-skip mode | Disables bottom MOSFET when inductor current reverses - improves light-load efficiency by >15% vs forced-continuous mode |
| 1.5A peak gate drivers with 1Ω RDS(ON) | Supports paralleling of high-current MOSFETs (e.g., Si7456DP) and fast switching at 600kHz with minimal transition losses |
| Separate BGRTN pin for negative bias | Allows –2V BGRTN supply to raise Miller immunity threshold - prevents false turn-on during >50V/ns dV/dt events at SW node |
| Undervoltage lockout (UVLO) with hysteresis | Enables at VCC ≥8.7V, disables at ≤6.2V - ensures stable startup and prevents brownout oscillation in noisy 12V/24V systems |
Applications
| Telecom Power Supply | Automotive High-Voltage DC/DC |
|---|---|
Use Scenario: Generating stable 12V/5V rails from –48V telecom battery backup or 72V vehicle battery under cold-crank conditions. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency step-down conversion with fast line regulation. Use Value: 100V absolute max rating withstands telecom surge transients; line feedforward maintains <100mV output deviation during 40V→75V input steps. |
Use Scenario: Converting 12V/24V/48V battery inputs to 3.3V/5V for ADAS sensors, infotainment, or gateway ECUs in vehicles with wide input range. IC Role / Device Role / Timing Role: High-reliability voltage-mode controller with robust UVLO and thermal protection for automotive-grade power stages. Use Value: –40°C to +85°C operation meets AEC-Q200 ambient requirements; 50µA shutdown current extends battery life in sleep modes. |
| Industrial 48V Server PSU | Networking Equipment Midplane |
Use Scenario: Point-of-load conversion in 48V datacenter server racks where efficiency, thermal management, and compact layout are critical. IC Role / Device Role / Timing Role: Synchronous buck controller driving paralleled MOSFETs to deliver >20A loads with minimal conduction loss. Use Value: Dual 1.5A gate drivers enable low-RDS(ON) MOSFET paralleling; programmable frequency avoids noise coupling into sensitive SerDes lanes. |
Use Scenario: Distributed power architecture in switches/routers requiring tightly regulated 1.8V/3.3V rails from 12V midplane with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable controller locked to system clock to eliminate beat frequencies and meet CISPR-32 Class B emissions. Use Value: External clock sync up to 600kHz enables deterministic noise placement; ±1% reference ensures <±15mV tolerance on 1.8V outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S | 42V max VIN, integrated MOSFETs, 2A output, Silent Switcher® architecture | Better EMI performance and smaller solution size; unsuitable for >42V inputs or >5A loads | Select LT8640S for compact, low-noise 12V–24V systems where integration outweighs voltage scalability |
| MPQ4316-AEC1 | 60V max VIN, AEC-Q100 qualified, 6A integrated, 2.2MHz fixed frequency | Automotive-qualified with higher switching frequency; lacks 100V rating and external MOSFET flexibility | Select MPQ4316-AEC1 for production automotive modules requiring qualification and higher frequency, but not for telecom or 72V+ inputs |
Compared with LT8640S and MPQ4316-AEC1, the LTC3703EG#TRPBF uniquely supports 100V input with external MOSFETs - enabling scalable, high-power, high-voltage designs where thermal management, efficiency at partial load, and design flexibility are prioritized over integration or automotive certification.
Availability
LTC3703EG#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive high-voltage DC/DC converters, and industrial 48V server applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3703EG#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 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3703 series.
The LTC3703 belongs to Linear's high-voltage controller family designed specifically for efficient, robust, and flexible synchronous buck conversion in demanding 48V–100V input environments such as telecom infrastructure and industrial power systems.
FAQ
What is the maximum input voltage rating for the LTC3703EG#TRPBF?
The LTC3703EG#TRPBF has an absolute maximum input voltage rating of 100V on the VIN pin, enabling direct step-down from high-voltage sources like telecom -48V battery systems (with phantom power), 72V automotive architectures, and industrial 96V buses. This rating is confirmed in the Absolute Maximum Ratings table and applies across the full operating temperature range.
Does the LTC3703EG#TRPBF require an external current-sense resistor?
No, the LTC3703EG#TRPBF does not require an external current-sense resistor. It implements current limiting by sensing the voltage drop (VDS) across the bottom N-channel MOSFET during its on-time, using the IMAX pin with a single external resistor to ground. This eliminates power loss, board space, and thermal drift associated with shunt resistors.
What package type and lead finish does the LTC3703EG#TRPBF use?
The LTC3703EG#TRPBF uses a 28-Lead Plastic SSOP (G Package) with lead-free (RoHS-compliant) finish and tape-and-reel packaging. The part marking is "LTC3703EG", and it is rated for operation from –40°C to +85°C ambient temperature, with a maximum junction temperature of 125°C.
Can the LTC3703EG#TRPBF operate in boost configuration?
Yes, the LTC3703EG#TRPBF supports both buck and boost topologies. When the INV pin is pulled above 2V, it configures the controller for boost operation - with TG driving the main switch and BG driving the synchronous rectifier - enabling regulated outputs up to 80V. This dual-mode capability is documented in the Applications section and Functional Diagram.
How is the switching frequency programmed on the LTC3703EG#TRPBF?
The switching frequency of the LTC3703EG#TRPBF is programmed using an external resistor connected from the fSET pin (Pin 7) 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. The oscillator can also be synchronized to an external clock applied to the MODE/SYNC pin.
LTC3703EG#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
- 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#TRPBF FAQ
1.How can I place an order for LTC3703EG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EG#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 LTC3703EG#TRPBF reliable?
The price and inventory of LTC3703EG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703EG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703EG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EG#TRPBF?
LTC3703EG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EG#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 LTC3703EG#TRPBF?
For technical support, including LTC3703EG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EG#TRPBF requirements.
6.How does Aetrix verify that LTC3703EG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EG#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 LTC3703EG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703EG#TRPBF?
All LTC3703EG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EG#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 LTC3703EG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703EG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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