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Analog Devices Inc. LTC3703IGN#TRPBF
- Part No.:
- LTC3703IGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703IGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,852
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Product details
Overview
LTC3703IGN#TRPBF from Analog Devices (formerly Linear Technology) is a 100V synchronous step-down switching regulator controller with voltage-mode architecture, programmable 100–600kHz constant-frequency operation, ±1% reference accuracy, and dual N-channel MOSFET gate drive. It enables high-efficiency telecom power supplies (e.g., 48V input to 12V/5A output) without external current-sense resistors by sensing RDS(ON) of the bottom FET.
For engineers reviewing the LTC3703IGN#TRPBF datasheet, LTC3703IGN#TRPBF pinout, LTC3703IGN#TRPBF application, or LTC3703IGN#TRPBF equivalent, key selection considerations include its 100V max VIN capability, -40°C to 125°C extended temperature grade, no-RSENSE current limiting, 1Ω gate drivers, and compatibility with logic-level or standard-threshold N-MOSFETs in buck topology.
Technical Context
The LTC3703IGN#TRPBF implements voltage-mode control with patented line feedforward compensation for instantaneous input-voltage transient rejection, and a 25MHz error amplifier enabling fast load-step response. Its oscillator supports resistor-programmed frequency (100–600kHz) or external synchronization up to 600kHz.
It features dual independent gate drivers: TG delivers floating high-side drive (up to 100V swing) via BOOST/SW bootstrap, while BG provides low-side drive referenced to BGRTN - configurable with negative return to suppress Miller-induced shoot-through. Current limit is set by a single resistor on IMAX using an internal 12µA source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage (VIN) | 100V - enables direct conversion from 48V telecom or 72V automotive battery rails without pre-regulation. |
| Reference Accuracy | ±1% - ensures stable 0.792V to 0.812V feedback threshold across temperature, supporting precise output regulation. |
| Switching Frequency Range | 100–600kHz - allows optimization of inductor size, efficiency, and EMI filtering; synchronizable to external clock. |
| Gate Driver Strength | 1.5–2A peak, 1Ω pull-down RDS(ON) - drives multiple paralleled MOSFETs or large Qg devices with minimal switching loss. |
| Current Limit Method | No external sense resistor - uses VDS of synchronous bottom FET, reducing BOM count and power loss. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood applications requiring extended thermal margin. |
| Shutdown Current | 50µA typical - minimizes standby power in always-on systems such as network infrastructure. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN16), RoHS-compliant, moisture-sensitive level 3. Pin pitch: 0.65mm. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse-skip enable / sync input | Below 0.8V forces continuous mode; above 0.8V enables pulse-skip; accepts external 100–600kHz sync clock. |
| fSET | Oscillator frequency programming | Resistor-to-ground sets free-running frequency; 25kΩ yields ~300kHz per datasheet. |
| COMP | Error amplifier output | Connect RC compensation network here to stabilize loop; interfaces directly with feedback divider at FB. |
| FB | Feedback input | Monitors output via resistor divider; compared to 0.8V internal reference to regulate VOUT. |
| IMAX | Current limit threshold | 12µA internal source sets threshold voltage; RIMAX to ground defines overcurrent trip point. |
| RUN/SS | Enable / soft-start control | Pull <0.9V to shut down; internal 4µA current charges CSS for controlled VOUT ramp-up. |
| BGRTN | Bottom gate driver return | Separate return pin allows negative bias (e.g., –2V) to suppress Miller-induced false turn-on during dV/dt events. |
| BG | Bottom gate drive output | Drives source of low-side N-MOSFET; swings from BGRTN to DRVCC (9.3–15V). |
| DRVCC | Low-side driver supply | Must be ≥9.3V; powers BG driver; bypass with 10µF X5R ceramic to BGRTN. |
| VCC | Main IC supply | Powers all internal circuitry except drivers; requires 9.3–15V, bypassed with ≥0.1µF ceramic to GND. |
| SW | Switch node connection | Connects to inductor and BOOST capacitor; voltage swings from –0.3V (Schottky drop) to VIN. |
| TG | Top gate drive output | Floats with SW node; drives gate of high-side N-MOSFET; powered from BOOST. |
| BOOST | High-side driver supply | Bypassed to SW with 0.1µF X5R; charged via external Schottky from DRVCC for floating gate drive. |
| VIN | Input voltage sense | Not a power pin; feeds line feedforward circuitry to improve line regulation and transient response. |
| GND | Analog ground reference | Primary ground for internal circuits; separate from BGRTN to avoid noise coupling into gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor required | Eliminates power loss and board space for RSENSE; uses bottom FET's RDS(ON) for accurate, temperature-compensated current limiting. |
| Programmable pulse-skip mode | Improves light-load efficiency by disabling bottom FET when inductor current reverses - avoids reverse conduction losses. |
| Patented line feedforward compensation | Instantly adjusts duty cycle on input transients (e.g., 25V→60V step), limiting output deviation to <50mV per Figure 2. |
| 16-pin narrow SSOP package | Compact footprint (5mm × 6mm) with 0.65mm pitch; supports automated assembly and thermal relief via exposed pad (GN16 variant). |
| Undervoltage lockout (UVLO) | VCC UV+ = 8.7V, UV– = 6.2V - prevents erratic startup or brownout operation in unstable input conditions. |
| Independent BGRTN pin | Enables negative gate bias (e.g., –2V) to counteract Miller capacitance coupling at SW node, preventing shoot-through in high-dV/dt environments. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Rail |
|---|---|
Use Scenario: Converting 48V battery or PoE++ input to isolated 12V/5A for baseband processing units in 5G remote radio heads. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side and low-side N-MOSFETs; regulates output with feedforward-enhanced line stability. Use Value: 100V VIN rating eliminates need for intermediate 24V stage; no-RSENSE reduces heat and improves efficiency at full load (>92% @ 5A, VIN=48V). |
Use Scenario: Generating 5V/3A power rail for radar sensor ECUs in vehicles with wide battery range (9V–16V nominal, up to 40V load dump). IC Role / Device Role / Timing Role: High-voltage buck controller operating in forced-continuous mode for consistent transient response during rapid acceleration/deceleration events. Use Value: –40°C to +125°C rating ensures reliability under hood; 50µA shutdown current extends battery life during vehicle sleep mode. |
| Industrial PLC I/O Module | Networking Switch Midplane |
Use Scenario: Providing 3.3V/2A auxiliary supply from 24V DC industrial bus for isolated digital I/O and communication interfaces. IC Role / Device Role / Timing Role: Synchronous step-down controller with programmable soft-start (via RUN/SS capacitor) to prevent inrush into downstream capacitive loads. Use Value: 1Ω gate drivers support paralleled MOSFETs for higher current; pulse-skip mode maintains >85% efficiency at 10mA standby load. |
Use Scenario: Generating 1.2V/20A core voltage for switch ASICs from 12V midplane supply in enterprise Ethernet switches. IC Role / Device Role / Timing Role: Controller driving multiple paralleled N-MOSFETs (Si7456DP) in multiphase-like configuration using single-phase topology. Use Value: Strong 2A peak gate drive reduces MOSFET switching time; 300kHz operation balances efficiency and inductor size for dense PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703EGN#TRPBF | Same functionality and pinout; rated for –40°C to +85°C ambient (vs. +125°C for IGN grade). | Suitable for commercial-grade telecom equipment or indoor networking gear where junction temperature stays below 125°C. | Select when cost sensitivity outweighs extended temperature requirement and thermal margin is sufficient. |
| LTC3779IUFD#PBF | 4-phase synchronous controller with integrated MOSFET drivers; supports up to 60V VIN; includes PMBus interface and telemetry. | Targeted at high-current server VRMs (≥40A); adds digital control, phase shedding, and fault logging not present in LTC3703. | Choose only if multi-phase operation, telemetry, or digital configurability are required - not a drop-in replacement. |
Compared with LTC3703EGN#TRPBF, the LTC3703IGN#TRPBF offers guaranteed operation up to +125°C junction temperature - critical for automotive or industrial enclosures with limited airflow. Versus LTC3779IUFD#PBF, it provides simpler analog control, lower component count, and cost advantage for single-phase ≤10A designs, but lacks digital interface and multi-phase capability.
Availability
LTC3703IGN#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS modules, and industrial PLC I/O systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3703IGN#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3703 belongs to ADI's high-voltage DC/DC controller product line, designed specifically for robust, efficient step-down conversion in harsh environments including telecom infrastructure, automotive electronics, and industrial automation.
FAQ
What is the maximum input voltage supported by the LTC3703IGN#TRPBF?
The LTC3703IGN#TRPBF supports a maximum input voltage of 100V on the VIN pin, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. This enables direct step-down from high-voltage sources like 48V telecom systems or 72V battery stacks without pre-regulation stages. Operation above 100V risks permanent damage per datasheet Note 1.
Does the LTC3703IGN#TRPBF require an external current-sense resistor?
No, the LTC3703IGN#TRPBF does not require an external current-sense resistor. It implements no-RSENSE current limiting by monitoring the voltage drop across the synchronous bottom MOSFET's RDS(ON), as detailed in the Current Limit section and Figure 1. The IMAX pin uses an internal 12µA current source to set the trip threshold with a single resistor to ground.
What is the operating temperature range of the LTC3703IGN#TRPBF?
The LTC3703IGN#TRPBF is specified for operation from –40°C to +125°C junction temperature, as stated in the Order Information table and Absolute Maximum Ratings. This "I" grade variant is qualified for automotive under-hood and industrial environments where ambient temperatures exceed +85°C, unlike the "E" grade (–40°C to +85°C).
Can the LTC3703IGN#TRPBF be used in boost configuration?
Yes, the LTC3703IGN#TRPBF supports boost mode operation via the INV pin: pulling INV above 2V configures it as a step-up controller with TG driving the main switch and BG driving the synchronous rectifier. However, this mode is limited to ≤60V output per datasheet description and is less commonly implemented than its primary buck application.
What package type and lead finish does the LTC3703IGN#TRPBF use?
The LTC3703IGN#TRPBF uses a 16-lead narrow plastic SSOP package (GN16) with lead-free (Pb-free) finish and tape-and-reel packaging (#TRPBF suffix). The part marking is "3703I", and it complies with JEDEC moisture sensitivity level 3, requiring bake prior to reflow if exposed beyond floor life.
LTC3703IGN#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3703IGN#TRPBF FAQ
1.How can I place an order for LTC3703IGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703IGN#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 LTC3703IGN#TRPBF reliable?
The price and inventory of LTC3703IGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703IGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703IGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703IGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703IGN#TRPBF?
LTC3703IGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703IGN#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 LTC3703IGN#TRPBF?
For technical support, including LTC3703IGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703IGN#TRPBF requirements.
6.How does Aetrix verify that LTC3703IGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703IGN#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 LTC3703IGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703IGN#TRPBF?
All LTC3703IGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703IGN#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 LTC3703IGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703IGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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