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Analog Devices Inc. LTC3703EG-5#TRPBF
- Part No.:
- LTC3703EG-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3703EG-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,706
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Product details
Overview
LTC3703EG-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down DC/DC controller IC designed for telecom and automotive power supplies. It operates with up to 60V input, delivers precise 0.8V reference (±1%), supports programmable switching frequency from 100kHz to 600kHz, and drives dual N-channel MOSFETs without requiring a current sense resistor - enabling efficient 5V/5A output in compact designs.
For engineers reviewing the LTC3703EG-5#TRPBF datasheet, LTC3703EG-5#TRPBF pinout, LTC3703EG-5#TRPBF application, or LTC3703EG-5#TRPBF equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative controllers with documented functional trade-offs.
Technical Context
The LTC3703EG-5#TRPBF implements voltage-mode control with patented line feedforward compensation, delivering fast line transient response and input-voltage-independent loop gain. Its error amplifier features 25MHz unity-gain bandwidth and 85dB DC open-loop gain, enabling aggressive compensation for high-bandwidth regulation.
It integrates dual 1Ω gate drivers (TG and BG), each capable of 1A peak source current, supporting logic-level MOSFETs with 4.5V–15V drive range. The IMAX pin uses a 12µA internal current source to set current limit via single external resistor, eliminating sensing loss while maintaining cycle-by-cycle overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V continuous - enables direct conversion from 48V telecom or 24V/36V automotive rails without pre-regulation. |
| Reference Voltage | 0.800V ±1% - ensures ±12.5mV absolute accuracy for stable 5V output with minimal feedback divider error. |
| Switching Frequency | 100kHz–600kHz, programmable via RFSET or synchronizable externally - allows noise-sensitive layout optimization and EMI compliance tuning. |
| Gate Drive Capability | 1Ω pull-down RDS(ON) on TG/BG outputs - supports parallel MOSFETs and fast slew rates for <100ns transitions on >1nF gates. |
| Current Limit Method | Voltage drop across bottom MOSFET sensed at IMAX pin - eliminates power loss and board space of shunt resistor; uses internal 12µA current source. |
| Shutdown Current | 25µA typical - reduces system standby power in battery-backed or always-on automotive modules. |
| Operating Temperature | –40°C to 85°C (E-grade) - qualified for under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), 0.635mm pitch, JEDEC MS-013AC. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Top gate driver floating supply | Provides charge-pump voltage for TG driver; must be bypassed to SW with 0.1µF X5R capacitor. |
| TG | Top N-MOSFET gate driver output | Swings from SW to BOOST; drives gate of high-side switch with 1A peak source capability. |
| SW | Switch node connection | Connects to inductor and bootstrap diode anode; handles full VIN swing (–1V to 70V). |
| BG | Bottom N-MOSFET gate driver output | Swings from BGRTN to DRVCC; 1A peak source, 1.8Ω pull-down RDS(ON). |
| BGRTN | Bottom gate return reference | Separate return path enables negative bias (e.g., –2V) to suppress Miller-induced shoot-through. |
| DRVCC | Bottom driver supply | Must be ≥4.5V to fully enhance logic-level MOSFETs; bypassed to BGRTN with 10µF low-ESR ceramic. |
| VIN | High-voltage input sense | Feeds line feedforward circuitry; not a power supply pin - connects directly to input rail. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 0.8V internal reference; sets regulated output. |
| COMP | Error amplifier output | Drives external RC compensation network; determines loop stability and transient response. |
| IMAX | Current limit threshold | 12µA internal current source sets overcurrent trip point using single resistor to ground. |
| RUN/SS | Enable and soft-start control | Pulling below 0.9V shuts down IC; internal 4µA current charges CSS for controlled VOUT ramp-up. |
| MODE/SYNC | Pulse skip enable / sync input | Below 0.8V forces continuous mode; above 0.8V enables pulse skip; accepts external 100–600kHz clock. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) as current sensor - saves 1–2W dissipation and PCB area in 5A+ designs. |
| Patented line feedforward compensation | Eliminates input-voltage dependency in control loop - achieves <50mV output deviation during 25V→60V VIN step (Fig. 1). |
| Programmable soft-start with internal 4µA current source | Enables precise turn-on timing (≈750ms/µF) and prevents inrush current damage to MOSFETs and capacitors. |
| Dual independent gate drivers with separate return paths | BGRTN pin allows negative bias to suppress dV/dt-induced false turn-on - critical for high dV/dt (>50V/ns) automotive SW nodes. |
| Integrated cycle-by-cycle and gm-amplifier current limiting | Combines instantaneous 50mV overvoltage detection with slow-reacting RUN/SS discharge - protects against both short-circuit and overload. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Converting 48V phantom power to 5V/3A for image sensor and ISP in vehicle-mounted cameras. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-efficiency, low-noise 5V rail with fast load transients during image capture bursts. Use Value: 60V input rating avoids need for intermediate 12V stage; pulse skip mode extends battery runtime during idle periods. |
Use Scenario: Generating stable 5V supply from 12V/24V vehicle battery for radar processing units operating in under-hood environments. IC Role / Device Role / Timing Role: High-reliability step-down controller with –40°C to 85°C operation and undervoltage lockout for cold-cranking immunity. Use Value: 25µA shutdown current minimizes parasitic drain; line feedforward ensures <100mV output deviation during alternator load dump events. |
| Industrial PLC I/O Module | Networking Switch PoE Midspan |
|
Use Scenario: Providing isolated 5V auxiliary power for digital I/O conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Primary DC/DC controller driving Si7850DP MOSFETs in synchronous buck topology with tight output regulation. Use Value: 0.8V reference enables accurate 5V output without trimming; 16-pin SSOP footprint simplifies thermal management in dense PCB layouts. |
Use Scenario: Generating 5V bias rail for PoE PD interface ICs and Ethernet PHYs in midspan injectors handling multiple 802.3af/at devices. IC Role / Device Role / Timing Role: High-input-voltage controller supporting wide VIN range (36–57V) from PoE PSE output while maintaining constant frequency. Use Value: External sync capability allows alignment with system clock to reduce conducted EMI in multi-rail networking equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2482DK-LF-Z | Lower max VIN (40V); no line feedforward; fixed 500kHz frequency; integrated MOSFETs (not external drive). | Suitable only for ≤40V inputs; lacks high-transient-response capability needed in telecom line transients. | Select when board space is constrained and input voltage never exceeds 40V; avoid for 48V telecom or automotive 60V surge scenarios. |
| LTC3779EUH#PBF | Higher VIN (100V); dual-phase operation; requires current sense resistor; 4mm × 4mm QFN package. | Supports higher power (≥20A) and 100V inputs but adds sensing loss and complexity for simple 5V/5A use cases. | Choose for 100V systems or multiphase scaling; LTC3703EG-5#TRPBF remains optimal for cost-sensitive, single-phase 60V buck designs. |
Compared with MP2482DK-LF-Z, LTC3703EG-5#TRPBF delivers superior line transient immunity and 20V higher input headroom; compared with LTC3779EUH#PBF, it offers lower BOM cost and simpler layout by eliminating the current sense resistor and supporting single-phase operation.
Availability
LTC3703EG-5#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS camera modules, and industrial PLC I/O modules requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC3703EG-5#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, industrial, automotive, and communications markets.
The LTC3703 product line was designed specifically for high-input-voltage synchronous buck conversion in harsh environments - targeting telecom base stations, automotive infotainment, and industrial control where reliability, efficiency, and transient robustness are critical.
FAQ
What is the maximum input voltage supported by the LTC3703EG-5#TRPBF?
The LTC3703EG-5#TRPBF supports up to 60V continuous input voltage, with absolute maximum ratings extending to 70V for 400ms transients. This makes it suitable for 48V telecom systems and 24V/36V automotive applications where load dump events may reach 60V. Operation beyond 60V continuous requires the pin-compatible LTC3703 (100V version).
Does the LTC3703EG-5#TRPBF require an external current sense resistor?
No, the LTC3703EG-5#TRPBF does not require an external current sense resistor. It senses current through the voltage drop across the bottom N-channel MOSFET's RDS(ON), using the IMAX pin with a 12µA internal current source and external resistor to ground - eliminating sensing power loss and PCB area.
How does the LTC3703EG-5#TRPBF achieve fast line transient response?
The LTC3703EG-5#TRPBF achieves fast line transient response via patented line feedforward compensation, which dynamically adjusts duty cycle in real time based on VIN changes. Combined with a 25MHz error amplifier and high-bandwidth voltage-mode control, it limits output deviation to <50mV during 25V→60V input steps - as verified in Figure 1 of the datasheet.
What package type is used for the LTC3703EG-5#TRPBF?
The LTC3703EG-5#TRPBF uses a 28-lead plastic SSOP (G package), 0.635mm pitch, per JEDEC MS-013AC. It has θJA = 110°C/W and is RoHS-compliant. This package provides robust thermal performance and compatibility with standard surface-mount assembly processes.
Can the LTC3703EG-5#TRPBF operate in both buck and boost configurations?
The LTC3703EG-5#TRPBF is optimized for synchronous buck (step-down) operation. While the INV pin can configure top/bottom gate polarity, the controller architecture - including feedback structure, feedforward design, and current limit sensing - is specified and characterized only for buck mode. Boost operation is not supported or guaranteed.
LTC3703EG-5#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):
- 4.1V ~ 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-5#TRPBF FAQ
1.How can I place an order for LTC3703EG-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EG-5#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-5#TRPBF reliable?
The price and inventory of LTC3703EG-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703EG-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EG-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EG-5#TRPBF?
LTC3703EG-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EG-5#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-5#TRPBF?
For technical support, including LTC3703EG-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EG-5#TRPBF requirements.
6.How does Aetrix verify that LTC3703EG-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EG-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703EG-5#TRPBF?
All LTC3703EG-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EG-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703EG-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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