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Analog Devices Inc. LTC3703IGN-5#TRPBF
- Part No.:
- LTC3703IGN-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703IGN-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,113
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Product details
Overview
LTC3703IGN-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 programmable constant-frequency control (100–600kHz), achieves ±1% reference accuracy (0.800V), and drives dual N-channel MOSFETs without requiring a current sense resistor. It is used in 48V telecom base station power supplies.
For engineers reviewing the LTC3703IGN-5#TRPBF datasheet, LTC3703IGN-5#TRPBF pinout, LTC3703IGN-5#TRPBF application, or LTC3703IGN-5#TRPBF equivalent, key selection criteria include high-input-voltage capability (60V max), gate driver strength (1Ω pull-down RDS(ON)), voltage-mode architecture with line feedforward compensation, and programmable current limit via IMAX pin.
Technical Context
The LTC3703IGN-5#TRPBF implements a voltage-mode control architecture with patented line feedforward compensation, enabling instantaneous duty-cycle adjustment to input voltage transients and eliminating input-dependent loop gain variation. Its error amplifier features 85dB DC open-loop gain and 25MHz unity-gain bandwidth, supporting fast load transient response.
It integrates dual 1Ω gate drivers - TG (top-side, floating, BOOST-referenced) and BG (bottom-side, BGRTN-referenced) - each capable of 1A peak source current. The IMAX pin uses an internal 12µA current source to set overcurrent threshold by sensing VDS across the synchronous MOSFET, removing need for external sense resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 60V continuous - enables direct conversion from 48V telecom or 36V automotive battery rails without pre-regulation |
| Reference Voltage | 0.800V ±1% - supports precise low-output-voltage regulation (e.g., 0.8V–12V) without external scaling |
| Switching Frequency | 100–600kHz programmable - balances efficiency (lower f) vs. size/noise (higher f); synchronizable externally |
| Gate Driver RDS(ON) | 1.2–1.8Ω (TG/BG pull-down) - ensures fast MOSFET turn-off, critical for high-current or paralleled FET designs |
| Current Limit Method | VDS-based sensing at IMAX pin - eliminates power loss and board space of shunt resistor; uses internal 12µA source |
| Shutdown Current | 25µA typical - minimizes standby power in always-on automotive or telecom systems |
| Operating Temp Range | –40°C to 125°C (junction) - qualified for under-hood automotive and industrial environments |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN package), 100°C/W junction-to-ambient thermal resistance, RoHS-compliant, tape-and-reel (TRPBF).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse skip enable / sync input | Logic-level input: <0.8V forces continuous mode; >0.8V enables pulse skip; also accepts external 100–600kHz sync clock |
| fSET | Oscillator frequency programming | Connects to ground via resistor (e.g., 25kΩ → 300kHz); sets free-running switching frequency |
| COMP | Error amplifier output | Direct connection point for RC compensation network to stabilize feedback loop and optimize transient response |
| FB | Feedback input | Monitors output voltage via resistor divider; compared to 0.800V internal reference to regulate VOUT |
| IMAX | Current limit threshold | Internal 12µA source sets comparator threshold; voltage drop across bottom MOSFET triggers cycle-by-cycle current limiting |
| INV | Mode select (buck/boost) | <1V configures buck operation (default); >2V reconfigures for boost topology using same controller |
| RUN/SS | Enable / soft-start control | Pull <0.9V disables controller (25µA shutdown); capacitor to ground provides controlled VOUT ramp-up (~750ms/µF) |
| GND | Analog ground reference | Primary return for internal analog circuits; must be low-impedance, separate from power ground where possible |
| BGRTN | Bottom gate driver return | Separate return for BG driver; allows negative bias (e.g., –2V) to suppress Miller-induced shoot-through during high dV/dt |
| BG | Bottom gate drive output | Drives source of low-side N-MOSFET; swings from BGRTN to DRVCC; 1A peak source, 1.2–1.8Ω pull-down |
| DRVCC | Bottom driver supply | 4.5–15V supply for BG driver; bypassed to BGRTN with ≥10µF X5R ceramic capacitor |
| VCC | Main logic supply | 4.5–15V supply for internal circuitry (excluding drivers); bypassed to GND with ≥0.1µF ceramic capacitor |
| SW | Switch node connection | Connects to inductor and bootstrap capacitor; voltage swings from ~–0.5V (Schottky drop) to VIN |
| TG | Top gate drive output | Drives gate of high-side N-MOSFET; floating output referenced to SW; powered from BOOST pin |
| BOOST | Top gate driver supply | Floating supply for TG driver; bypassed to SW with 0.1µF X5R ceramic; charged via external Schottky from DRVCC |
| VIN | High-voltage input sense | Not a power pin; connects to input rail for line feedforward compensation; supports up to 70V (400ms) |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | VDS-based current sensing on bottom MOSFET eliminates 1–3W power loss and PCB area of shunt resistor |
| Patented line feedforward compensation | Real-time input voltage feedforward removes line-regulation dependency on loop bandwidth, enabling <100ns line transient recovery |
| Programmable pulse skip mode | Enables >90% efficiency at light loads (e.g., <100mA) by disabling reverse inductor current, reducing gate charge losses |
| Strong 1Ω gate drivers | 1A peak source + 1.2–1.8Ω pull-down enables driving multiple parallel MOSFETs or large Qg devices (e.g., Si7850DP) at 600kHz |
| Undervoltage lockout with hysteresis | 3.7V turn-on / 3.1V turn-off (0.65V hysteresis) prevents erratic startup during brown-out conditions in automotive 12V systems |
| Separate BGRTN pin | Allows negative bias on bottom gate return to counteract Miller-effect turn-on during high dV/dt at SW node, preventing shoot-through |
Applications
| 48V Telecom Power Supply | Automotive ADAS ECU Power |
|---|---|
Use Scenario: Converting 48V intermediate bus to 5V/3.3V for baseband processors and RF front-ends in 5G small cells. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-transient-response DC/DC conversion with line feedforward for rapid 48V input ripple rejection. Use Value: Eliminates pre-regulator stage; 60V rating supports full 48V telecom range including surges; pulse skip maintains >88% efficiency at 50mA load. |
Use Scenario: Generating 5V rail for radar sensor modules and camera ISPs in automotive ADAS domain controllers. IC Role / Device Role / Timing Role: High-reliability buck controller operating from 12V battery (with cold-crank down to 6V) and load-dump tolerant up to 60V. Use Value: –40°C to 125°C qualification meets AEC-Q100 Grade 1; 25µA shutdown current extends battery life in parked state; soft-start prevents inrush into capacitive camera loads. |
| Industrial PLC I/O Module | Networking Switch PoE Midspan |
Use Scenario: Providing isolated 12V/24V auxiliary power for analog input/output conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Robust buck controller interfacing with wide-input industrial SMPS, featuring undervoltage lockout and programmable current limit for fault containment. Use Value: 100–600kHz frequency programming allows noise-sensitive placement near ADCs; 1.2Ω BG driver RDS(ON) ensures clean turn-off during short-circuit events. |
Use Scenario: Generating 54V intermediate bus from AC/DC front-end to feed IEEE 802.3at PoE++ PSE circuitry in enterprise switches. IC Role / Device Role / Timing Role: High-voltage buck controller stepping down 75V DC-link to regulated 54V, synchronized to system clock to avoid spectral interference with Ethernet PHYs. Use Value: External sync capability (100–600kHz) enables deterministic EMI management; BOOST/TG floating drive supports reliable 54V switching with minimal layout sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP24894GQ-Z | 40V max input, integrated MOSFETs, fixed 500kHz fSW, no IMAX-based current sensing | Suitable for lower-voltage, space-constrained designs; lacks high-voltage robustness and programmable current limit | Select when input ≤40V and integration outweighs flexibility; not drop-in for 60V telecom use cases |
| LTC3891EMSE#PBF | 60V input, dual output, includes LDO bias rail, higher quiescent current (45µA), different pinout | Preferred for multi-rail systems needing bias supply; less optimal for single-output cost-sensitive designs | Choose when dual outputs or integrated bias are required; requires PCB redesign due to 16-pin MSOP vs. GN SSOP |
Compared with MP24894GQ-Z and LTC3891EMSE#PBF, the LTC3703IGN-5#TRPBF uniquely combines 60V operation, resistor-programmable frequency, VDS-based current limit, and line feedforward - making it optimal for high-transient, high-input-voltage industrial and telecom buck converters where precision and reliability are prioritized over integration.
Availability
LTC3703IGN-5#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS ECUs, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 125°C.
Supply support for LTC3703IGN-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 industrial, automotive, communications, and healthcare markets.
The LTC3703 series is part of Linear's high-voltage power controller product line, engineered specifically for efficient, robust DC/DC conversion in demanding 24–60V input applications such as telecom infrastructure and automotive subsystems.
FAQ
What is the maximum input voltage rating for the LTC3703IGN-5#TRPBF?
The LTC3703IGN-5#TRPBF supports up to 60V continuous input voltage and 70V for 400ms transient conditions. This rating enables direct operation from 48V telecom buses and 36V automotive systems, eliminating the need for pre-regulators. Absolute maximum ratings specify 80V for 400ms on VIN, but sustained operation above 60V violates the device's guaranteed specifications and may impair reliability.
Does the LTC3703IGN-5#TRPBF require an external current sense resistor?
No, the LTC3703IGN-5#TRPBF does not require an external current sense resistor. It implements VDS-based current sensing using the bottom MOSFET's on-resistance. An internal 12µA current source at the IMAX pin sets the current limit threshold, and the controller compares the voltage drop across the MOSFET to this threshold for cycle-by-cycle protection - reducing power loss and PCB area versus shunt-based solutions.
How is the switching frequency programmed on the LTC3703IGN-5#TRPBF?
The switching frequency of the LTC3703IGN-5#TRPBF is programmed using an external resistor (RSET) connected from the fSET pin (Pin 2) to ground. With RSET = 25kΩ, the nominal frequency is 300kHz. The range spans 100kHz (RSET ≈ 75kΩ) to 600kHz (RSET ≈ 12.5kΩ). The oscillator can also be synchronized to an external 100–600kHz clock applied to the MODE/SYNC pin, which disables pulse skip mode automatically.
What is the purpose of the BGRTN pin on the LTC3703IGN-5#TRPBF?
The BGRTN pin on the LTC3703IGN-5#TRPBF provides a dedicated return path for the bottom gate driver (BG), decoupling it from the main GND. This allows connection to a negative supply (e.g., –2V) to counteract Miller capacitance-induced gate turn-on during high dV/dt transitions at the SW node - significantly reducing risk of shoot-through between top and bottom MOSFETs in high-speed, high-voltage buck converters.
Can the LTC3703IGN-5#TRPBF be used in boost configuration?
Yes, the LTC3703IGN-5#TRPBF supports boost operation via the INV pin (Pin 6). Pulling INV above 2V reconfigures the controller to drive the TG output as the main switch and the BG output as the synchronous rectifier - enabling step-up conversion. However, the datasheet emphasizes buck operation as primary; boost use requires careful attention to external component stress, especially at BOOST and SW nodes, and is not validated for all 60V input conditions.
LTC3703IGN-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3703IGN-5#TRPBF FAQ
1.How can I place an order for LTC3703IGN-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703IGN-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 LTC3703IGN-5#TRPBF reliable?
The price and inventory of LTC3703IGN-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 LTC3703IGN-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703IGN-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703IGN-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703IGN-5#TRPBF?
LTC3703IGN-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703IGN-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 LTC3703IGN-5#TRPBF?
For technical support, including LTC3703IGN-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703IGN-5#TRPBF requirements.
6.How does Aetrix verify that LTC3703IGN-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703IGN-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 LTC3703IGN-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703IGN-5#TRPBF?
All LTC3703IGN-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703IGN-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 LTC3703IGN-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703IGN-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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