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Analog Devices Inc. LTC3703EGN-5#TRPBF
- Part No.:
- LTC3703EGN-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703EGN-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,025
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Product details
Overview
LTC3703EGN-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 input voltages up to 60V, delivers ±1% reference accuracy, supports programmable switching frequency from 100kHz to 600kHz, and drives dual N-channel MOSFETs without requiring a current sense resistor. It enables efficient 5V/5A conversion in base station power supplies.
For engineers reviewing the LTC3703EGN-5#TRPBF datasheet, LTC3703EGN-5#TRPBF pinout, LTC3703EGN-5#TRPBF application, or LTC3703EGN-5#TRPBF equivalent, key selection criteria include its 60V VIN capability, voltage-mode control architecture, gate driver strength (1Ω pull-down), programmable current limit via IMAX pin, and compatibility with logic-level MOSFETs in narrow SSOP-16 packaging.
Technical Context
The LTC3703EGN-5#TRPBF implements a constant-frequency, voltage-mode control architecture with patented line feedforward compensation to achieve 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 outputs), supports bootstrap-based high-side drive up to 85V (continuous), and uses the bottom MOSFET's RDS(ON) as a current-sense element-eliminating external sense resistors. The RUN/SS pin provides soft-start via internal 4µA current source and shutdown with 25µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V continuous; supports direct 48V telecom rail conversion without pre-regulation |
| Reference Voltage | 0.800V ±1% over temperature; enables precise 5V output with simple resistor divider |
| Switching Frequency | 100kHz–600kHz programmable via fSET resistor; allows optimization of inductor size vs. efficiency |
| Gate Driver Strength | 1Ω pull-down RDS(ON) on TG/BG; drives multiple parallel MOSFETs for >10A applications |
| Current Limit Method | Voltage drop across bottom MOSFET sensed at IMAX pin; eliminates power loss from sense resistor |
| Shutdown Current | 25µA typical; reduces system standby power in automotive always-on modules |
| Operating Temp Range | –40°C to +85°C (E-grade); qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN package), 5.0mm × 6.2mm body, 0.635mm pitch, JEDEC MO-153 compliant. Thermal resistance θJA = 100°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Pulse skip enable / sync input | Pull >0.8V for pulse skip mode; accept 100–600kHz external clock for EMI control |
| fSET (2) | Oscillator frequency set | Resistor to GND programs 100–600kHz; sets timing capacitor charge rate |
| COMP (3) | Error amplifier output | Connect RC network here to stabilize loop; determines load transient recovery time |
| FB (4) | Feedback input | Monitors VOUT via resistor divider; compared to 0.8V reference for regulation |
| IMAX (5) | Current limit threshold | 12µA internal source sets trip point; voltage drop across bottom FET triggers limit |
| INV (6) | Mode select (buck/boost) | <1V = buck mode (default); >2V = boost mode; configures TG/BG phase relationship |
| RUN/SS (7) | Enable / soft-start | Internal 4µA source charges CSS; controls startup ramp time and prevents inrush |
| GND (8) | Analog ground | Reference for FB, COMP, IMAX; must be low-impedance connection to power ground plane |
| BGRTN (9) | Bottom gate return | Source node for BG driver; connect to –2V to suppress Miller-induced shoot-through |
| BG (10) | Bottom gate drive | Drives source of synchronous rectifier; swing from BGRTN to DRVCC |
| DRVCC (11) | Driver supply | 4.5–15V supply for BG driver; bypass with 10µF X5R ceramic to BGRTN |
| VCC (12) | Main supply | 4.5–15V for internal circuitry; bypass with 0.1µF ceramic near pin |
| SW (13) | Switch node | Connects to inductor and bootstrap cap; swings from –0.3V to VIN during operation |
| TG (14) | Top gate drive | Floating driver for high-side MOSFET; powered from BOOST, returns to SW |
| BOOST (15) | Bootstrap supply | Charged via external Schottky from DRVCC; maintains TG drive during high-side conduction |
| VIN (16) | Input voltage sense | Not a power pin; feeds line feedforward path 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-reduces BOM cost, PCB area, and conduction losses |
| Patented line feedforward compensation | Eliminates input-voltage dependence in control loop-enables <50mV line transient deviation at 25V→60V step |
| Programmable pulse skip mode | Improves light-load efficiency by disabling reverse current flow-extends battery runtime in automotive telematics |
| Strong 1Ω gate drivers | Supports paralleled MOSFETs and low-Qg devices-enables scalable designs from 5A to 30A with same controller |
| Undervoltage lockout with hysteresis | 3.7V turn-on / 3.1V turn-off thresholds prevent brownout oscillation during cold-crank automotive conditions |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Module |
|---|---|
Use Scenario: Converting 48V intermediate bus to 5V/5A for baseband processors and RF transceivers in 5G small cells. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-side and low-side N-MOSFETs; regulates output using voltage-mode feedback with line feedforward. Use Value: Enables direct 48V-to-5V conversion without pre-regulator stage-reducing component count and improving system efficiency by >3% versus two-stage approach. | Use Scenario: Providing stable 5V rail for camera image signal processors (ISPs) and radar microcontrollers in autonomous driving ECUs. IC Role / Device Role / Timing Role: High-reliability buck controller operating across –40°C to +85°C; uses RUN/SS soft-start to prevent inrush into large camera sensor capacitors. Use Value: 25µA shutdown current and robust UVLO ensure compliance with automotive ISO 16750-2 cold-crank requirements (4.5V minimum). |
| Industrial PLC I/O Module | Networking Switch ASIC Supply |
Use Scenario: Generating isolated 5V bias for digital isolators and analog front-ends in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck stage feeding downstream isolated DC/DC; handles 24V–60V wide-input industrial rails. Use Value: 60V absolute max VIN rating and 100°C/W thermal design allow operation in unventilated enclosures without derating. | Use Scenario: Delivering 5V/10A to high-performance switch ASICs in enterprise Ethernet switches with strict EMI limits. IC Role / Device Role / Timing Role: Synchronizable buck controller locked to system clock (e.g., 250kHz) to avoid beat frequencies with SERDES lanes. Use Value: External sync capability eliminates switching noise peaks in 150–200MHz band-simplifying FCC Class A radiated emissions testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP24894GQKT-Z | Lower max VIN (40V); integrated MOSFETs; no IMAX current limit programming | Suitable only for ≤36V inputs; limited to ≤6A due to internal FETs; lacks bottom-FET RDS(ON) sensing | Select when board space is critical and input voltage never exceeds 36V; avoid for 48V telecom or automotive 60V transients. |
| LTC3891EGN-5#TRPBF | Higher VIN (100V); includes built-in LDO for VCC; same GN-16 package and pin-compatible | Direct upgrade path for 60V+ systems; adds 5V/250mA LDO for auxiliary rails; shares identical layout and compensation network | Choose for future-proofing against higher input transients or when auxiliary bias is needed-no PCB change required. |
Compared with MP24894GQKT-Z, LTC3703EGN-5#TRPBF offers 50% higher input voltage headroom and true programmable current limiting, while LTC3891EGN-5#TRPBF extends voltage range and adds integrated bias generation-making it a drop-in replacement for upgraded reliability without layout revision.
Availability
LTC3703EGN-5#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS modules, and industrial PLC I/O requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC3703EGN-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3703 product line delivers high-voltage synchronous buck controllers optimized for telecom, automotive, and industrial power systems where input voltage resilience, efficiency across load range, and robust transient response are critical.
FAQ
What is the maximum input voltage rating for the LTC3703EGN-5#TRPBF?
The LTC3703EGN-5#TRPBF supports continuous input voltages up to 60V, with absolute maximum ratings of 70V for 400ms transients. This makes it suitable for direct regulation from 48V telecom buses and automotive 60V load-dump conditions. Exceeding 60V continuously risks violating the specified operating range and may impact long-term reliability.
Does the LTC3703EGN-5#TRPBF require an external current sense resistor?
No, the LTC3703EGN-5#TRPBF does not require an external current sense resistor. It senses current by monitoring the voltage drop across the bottom N-channel MOSFET's RDS(ON) using the IMAX pin, which contains a 12µA internal current source. This eliminates power loss and PCB area associated with discrete sense resistors.
How is the switching frequency programmed on the LTC3703EGN-5#TRPBF?
The switching frequency of the LTC3703EGN-5#TRPBF is programmed using an external resistor (RSET) connected from the fSET pin (Pin 2) to ground. A 25kΩ resistor sets ~300kHz; values from 10.7kΩ to 64.9kΩ yield 600kHz to 100kHz respectively. Frequency can also be synchronized externally via the MODE/SYNC pin.
What package type and footprint does the LTC3703EGN-5#TRPBF use?
The LTC3703EGN-5#TRPBF uses a 16-lead narrow plastic SSOP (GN package), measuring 5.0mm × 6.2mm with 0.635mm lead pitch. It is JEDEC MO-153 compliant and shares footprint compatibility with other Linear/ADI GN-16 controllers like the LTC3780 and LTC3850.
Can the LTC3703EGN-5#TRPBF operate in boost configuration?
Yes, the LTC3703EGN-5#TRPBF can operate in boost mode by applying >2V to the INV pin (Pin 6), which reconfigures TG as the main switch driver and BG as the synchronous rectifier driver. However, the datasheet emphasizes buck operation as primary; boost performance depends on external component selection and is not characterized across full temperature range.
LTC3703EGN-5#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):
- 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:
- 16-SSOP
LTC3703EGN-5#TRPBF FAQ
1.How can I place an order for LTC3703EGN-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EGN-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 LTC3703EGN-5#TRPBF reliable?
The price and inventory of LTC3703EGN-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 LTC3703EGN-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703EGN-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EGN-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EGN-5#TRPBF?
LTC3703EGN-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EGN-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 LTC3703EGN-5#TRPBF?
For technical support, including LTC3703EGN-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EGN-5#TRPBF requirements.
6.How does Aetrix verify that LTC3703EGN-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EGN-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 LTC3703EGN-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703EGN-5#TRPBF?
All LTC3703EGN-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EGN-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 LTC3703EGN-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703EGN-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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