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Analog Devices Inc. LTC3703IGN-5#PBF
- Part No.:
- LTC3703IGN-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703IGN-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,479
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Product details
Overview
LTC3703IGN-5#PBF 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 ±1% reference accuracy, supports 100kHz–600kHz programmable switching frequency, and drives dual external 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#PBF datasheet, LTC3703IGN-5#PBF pinout, LTC3703IGN-5#PBF application, or LTC3703IGN-5#PBF equivalent, key selection criteria include high-input-voltage capability (60V max), gate driver strength (1Ω pull-down RDS(ON)), voltage-mode control architecture, programmable current limit via IMAX pin, and compatibility with logic-level MOSFETs using separate DRVCC and BOOST supplies.
Technical Context
The LTC3703IGN-5#PBF implements a constant-frequency voltage-mode control architecture with patented line feedforward compensation, enabling fast line transient response without slope compensation. Its error amplifier features 25MHz unity-gain bandwidth and 85dB DC open-loop gain, supporting high crossover frequencies for tight regulation under dynamic load changes.
It integrates dual independent gate drivers: a floating high-side TG driver powered from BOOST/SW and a low-side BG driver referenced to BGRTN, each capable of 1A peak source current and 1.8Ω pull-down RDS(ON). The IMAX pin uses an internal 12µA current source to set overcurrent threshold by sensing VDS across the bottom MOSFET, eliminating 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% - allows precise output regulation down to 0.8V without external level-shifting circuitry. |
| Switching Frequency | 100kHz to 600kHz, programmable via fSET resistor - balances efficiency, inductor size, and EMI filtering requirements. |
| Gate Driver RDS(ON) | 1.2Ω to 1.8Ω (TG/BG pull-down) - ensures fast MOSFET turn-off and robust shoot-through prevention. |
| Current Limit Sensing | Voltage-based, using bottom MOSFET RDS(ON) - eliminates power loss and board space of discrete current sense resistor. |
| Shutdown Current | 25µA typical - minimizes standby power in always-on automotive or network infrastructure systems. |
| Operating Temp Range | –40°C to 125°C (junction) - qualified for under-hood automotive and industrial ambient environments. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN package), 5.0mm × 6.0mm body, 0.635mm pitch, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse skip enable / sync input | Enables forced continuous mode when pulled <0.8V; accepts external clock up to 600kHz for EMI control. |
| fSET | Oscillator frequency programming | Resistor-to-ground sets free-running frequency; 25kΩ yields ~300kHz. |
| COMP | Error amplifier output | Connects RC compensation network to stabilize loop and optimize transient response. |
| FB | Feedback input | Monitors output voltage via resistor divider; compared to 0.8V internal reference. |
| IMAX | Current limit threshold | 12µA internal current source sets overcurrent trip point using single resistor to ground. |
| INV | Mode select (buck/boost) | <1V selects buck (step-down); >2V selects boost (step-up) - configures TG/BG drive polarity. |
| RUN/SS | Enable / soft-start control | Pulling <0.9V disables controller; internal 4µA current charges CSS for controlled startup ramp. |
| GND | Analog ground reference | Return for internal circuits; must be low-impedance connection to minimize noise coupling. |
| BGRTN | Bottom gate driver return | Separate return path for BG driver; allows negative bias to suppress Miller-induced shoot-through. |
| BG | Bottom gate drive output | Drives source-connected N-MOSFET gate from BGRTN to DRVCC (4.5V–15V range). |
| DRVCC | Low-side driver supply | Must be ≥4.5V to fully enhance logic-level MOSFETs; bypassed with 10µF X5R ceramic. |
| VCC | Main IC supply | Powers all internal circuitry except drivers; requires 0.1µF local bypass to GND. |
| SW | Switch node connection | Connects to inductor and bootstrap capacitor; swings from –0.3V to 70V (400ms rating). |
| TG | Top gate drive output | Floating driver referenced to SW; powered from BOOST; drives high-side N-MOSFET gate. |
| BOOST | High-side driver supply | Charged via external Schottky diode from DRVCC; bypassed with 0.1µF X5R to SW. |
| VIN | Input voltage sense | Not a power pin; feeds line feedforward circuitry to improve line regulation and transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) as current-sense element - reduces BOM cost, PCB area, and conduction losses. |
| Programmable constant frequency | 100kHz–600kHz via single fSET resistor - enables optimization of magnetics size, efficiency, and conducted EMI. |
| Patented line feedforward compensation | Real-time duty-cycle adjustment to input voltage changes - eliminates output overshoot/undershoot during VIN transients. |
| Dual independent gate drivers | 1Ω typical pull-down impedance per driver - supports paralleling MOSFETs and fast switching at high frequencies. |
| Selectible Pulse Skip Mode | Enables high light-load efficiency by skipping cycles and disabling reverse current flow - critical for always-on telecom systems. |
| Separate BGRTN pin | Allows negative bias on bottom gate return - actively suppresses Miller-induced false turn-on during high dV/dt at SW node. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Rail |
|---|---|
Use Scenario: Generating stable 5V/12V intermediate bus from 48V vehicle battery or telecom rectified -48V supply. IC Role / Device Role / Timing Role: Synchronous buck controller managing high-side and low-side N-MOSFETs in fixed-frequency voltage-mode topology. Use Value: Direct 60V input capability eliminates pre-regulator stage; ±1% reference ensures accurate downstream DC/DC converter inputs. | Use Scenario: Powering radar, camera, and domain controller modules in vehicles with wide input voltage range (9V–60V). IC Role / Device Role / Timing Role: Primary step-down controller delivering regulated 3.3V or 5V with fast load transient response for safety-critical subsystems. Use Value: –40°C to 125°C operation and undervoltage lockout (3.1V–3.7V) ensure reliable startup and brownout protection in harsh under-hood environments. |
| Industrial PLC I/O Module | Networking Switch Midplane |
Use Scenario: Providing isolated 5V/3.3V rails for digital I/O, analog front-ends, and communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency buck controller driving logic-level MOSFETs with programmable current limit for short-circuit protection. Use Value: IMAX-based current limiting avoids sense resistor losses; Pulse Skip Mode maintains >85% efficiency at 10mA load for energy-sensitive edge nodes. | Use Scenario: Generating 12V/5V system rails from 48V midplane in enterprise Ethernet switches and routers. IC Role / Device Role / Timing Role: Synchronous step-down controller synchronized to system clock via MODE/SYNC pin to reduce EMI coupling into high-speed SerDes lanes. Use Value: External synchronization up to 600kHz enables deterministic noise placement; strong 1Ω drivers support multi-phase parallel configurations. |
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-LF-Z | Lower max input (40V vs 60V); integrated MOSFETs; no IMAX-based current sensing. | Suitable for lower-voltage industrial DC/DC where board space is constrained but 48V operation not required. | Select MP24894GQKT-LF-Z only if input stays ≤40V and integrated FETs meet current/power needs. |
| LTC3891IFE#PBF | Higher VIN rating (150V); includes built-in LDO for bias supply; same 16-pin GN package footprint. | Preferred for 72V+ battery systems or where auxiliary 3.3V/5V bias rail is needed without external regulators. | LTC3891IFE#PBF offers extended voltage range and integrated bias, but costs more and consumes more quiescent current. |
Compared with MP24894GQKT-LF-Z and LTC3891IFE#PBF, the LTC3703IGN-5#PBF uniquely balances 60V operation, external MOSFET flexibility, resistor-free current limiting, and precise 0.8V reference - making it optimal for high-reliability 48V telecom and automotive buck designs requiring design margin and thermal robustness.
Availability
LTC3703IGN-5#PBF 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 product lifecycles.
Supply support for LTC3703IGN-5#PBF 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 semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, reliability, and ruggedness-critical applications.
The LTC3703 family was designed specifically for high-input-voltage synchronous buck conversion in telecom, automotive, and industrial systems - emphasizing voltage-mode control, MOSFET driver strength, and resistorless current limiting.
FAQ
What is the maximum input voltage supported by the LTC3703IGN-5#PBF?
The LTC3703IGN-5#PBF supports up to 60V continuous input voltage, with absolute maximum ratings extending to 70V (continuous) and 80V (400ms). This makes it suitable for direct regulation from 48V telecom supplies and 36V/48V automotive battery systems without pre-regulation stages. The device's internal feedforward compensation maintains tight regulation across this full input range.
Does the LTC3703IGN-5#PBF require an external current sense resistor?
No, the LTC3703IGN-5#PBF does not require an external current sense resistor. It senses output current by monitoring the voltage drop across the RDS(ON) of the bottom synchronous MOSFET using the IMAX pin and its internal 12µA current source. This eliminates power loss, board space, and cost associated with discrete sense resistors while maintaining accurate overcurrent protection.
How is the switching frequency programmed on the LTC3703IGN-5#PBF?
The switching frequency of the LTC3703IGN-5#PBF is programmed using an external resistor (RSET) connected from the fSET pin to ground. A 25kΩ resistor sets the nominal frequency to 300kHz; values between 10kΩ and 100kΩ yield 100kHz to 600kHz. The oscillator can also be synchronized to an external clock applied to the MODE/SYNC pin within the same 100kHz–600kHz range.
What is the purpose of the BGRTN pin on the LTC3703IGN-5#PBF?
The BGRTN pin on the LTC3703IGN-5#PBF provides a dedicated return path for the bottom gate driver, enabling connection to a negative supply (e.g., –2V) to counteract Miller capacitance-induced false turn-on during high dV/dt transitions at the SW node. This feature significantly improves shoot-through immunity in high-frequency, high-voltage buck converters using logic-level MOSFETs.
Can the LTC3703IGN-5#PBF operate in boost (step-up) mode?
Yes, the LTC3703IGN-5#PBF can operate in boost mode. Pulling the INV pin above 2V reconfigures the gate drive logic so that TG drives the synchronous MOSFET and BG drives the main switch, enabling step-up operation. However, the datasheet emphasizes its primary use case as a synchronous buck controller, and boost-mode performance (e.g., efficiency, stability) is not characterized to the same extent as buck mode.
LTC3703IGN-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3703IGN-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703IGN-5#PBF 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#PBF reliable?
The price and inventory of LTC3703IGN-5#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3703IGN-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703IGN-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703IGN-5#PBF?
LTC3703IGN-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703IGN-5#PBF 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#PBF?
For technical support, including LTC3703IGN-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703IGN-5#PBF requirements.
6.How does Aetrix verify that LTC3703IGN-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3703IGN-5#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3703IGN-5#PBF?
All LTC3703IGN-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703IGN-5#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3703IGN-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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