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Analog Devices Inc. LTC3703EG-5#PBF
- Part No.:
- LTC3703EG-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3703EG-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,550
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Product details
Overview
LTC3703EG-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 directly from up to 60V input, delivers precise 0.8V reference (±1%), supports programmable switching frequency from 100kHz to 600kHz, and drives dual external N-channel MOSFETs without requiring a current sense resistor - enabling efficient, high-current buck conversion in harsh environments.
For engineers reviewing the LTC3703EG-5#PBF datasheet, LTC3703EG-5#PBF pinout, LTC3703EG-5#PBF application, or LTC3703EG-5#PBF equivalent, key selection criteria include its 60V max VIN rating, 1Ω gate drivers, voltage-mode control architecture with line feedforward compensation, programmable current limit via IMAX pin, and compatibility with narrow 16-pin SSOP packaging for space-constrained industrial designs.
Technical Context
The LTC3703EG-5#PBF implements a constant-frequency, voltage-mode control architecture with patented line feedforward compensation to deliver exceptional line transient response and eliminate input-voltage-dependent loop gain variation. Its error amplifier features 25MHz unity-gain bandwidth and 85dB DC open-loop gain, enabling fast load regulation with optimized RC compensation at the COMP pin.
It integrates dual independent gate drivers: a floating top-side driver (TG) powered from BOOST/SW with ±1A peak current and 1.2–1.8Ω pull-down RDS(ON), and a bottom-side driver (BG) referenced to BGRTN with identical drive strength. Current limiting uses synchronous MOSFET RDS(ON) sensing - eliminating external sense resistors - via a 12µA internal current source on the IMAX pin and a cycle-by-cycle comparator with 50mV threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage (VIN) | 60V continuous - enables direct step-down from 48V telecom or 36V automotive battery rails without pre-regulation. |
| Reference Voltage | 0.800V ±1% - supports accurate output regulation down to 0.8V without external level-shifting circuitry. |
| Switching Frequency Range | 100kHz to 600kHz (programmable via fSET resistor) - balances efficiency, EMI, and magnetics size. |
| Gate Driver Strength | 1Ω typical pull-down RDS(ON) per driver - ensures fast MOSFET turn-off and supports paralleling for >10A applications. |
| Current Limit Sensing | Voltage-based sensing across bottom MOSFET - eliminates power loss and board area of discrete current sense resistor. |
| Shutdown Current | 25µA typical - minimizes system standby power in always-on automotive or networking equipment. |
| Operating Temperature | –40°C to 85°C (E-grade) - qualified for industrial and extended-temperature embedded power systems. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN package), 0.15mm lead thickness, 0.65mm pitch, JEDEC MS-013AC compliant. Thermal resistance θJA = 100°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC (1) | Pulse skip enable / sync input | Enables light-load efficiency optimization or external clock synchronization up to 600kHz; doubles as secondary output feedback pin. |
| fSET (2) | Oscillator frequency set | Resistor-to-ground sets free-running frequency; determines inductor size, ripple, and EMI profile. |
| COMP (3) | Error amplifier output | Connects to RC compensation network; controls loop stability, transient response, and bandwidth. |
| FB (4) | Feedback input | Monitors output voltage via resistor divider; compared against 0.8V internal reference for regulation. |
| IMAX (5) | Current limit threshold | 12µA internal current source sets overcurrent trip point using single resistor to ground. |
| INV (6) | Mode select (buck/boost) | Logic-level input selects step-down (buck) operation (<1V) or step-up (boost) mode (>2V). |
| RUN/SS (7) | Enable / soft-start control | Pulling below 0.9V shuts down IC; capacitor to ground provides controlled output ramp-up and inrush limiting. |
| GND (8) | Analog ground reference | Primary return for internal analog circuits; must be low-impedance and separated from power ground where possible. |
| BGRTN (9) | Bottom gate driver return | Separate return for BG driver; allows negative bias to suppress Miller-induced shoot-through during high dV/dt transitions. |
| BG (10) | Bottom gate drive output | Drives source of low-side N-MOSFET; swings from BGRTN to DRVCC; supports <1.8Ω pull-down for fast turn-off. |
| DRVCC (11) | Driver supply input | Provides power to BG driver; must be ≥4.5V for logic-level MOSFETs; bypassed with 10µF ceramic to BGRTN. |
| VCC (12) | Main supply input | Powers all internal logic and analog blocks except drivers; requires 4.5–15V and local 0.1µF ceramic bypass to GND. |
| SW (13) | Switch node connection | Connects to inductor and bootstrap capacitor; experiences full VIN-to-ground swing; critical for layout and noise control. |
| TG (14) | Top gate drive output | Floating driver for high-side N-MOSFET; powered from BOOST; returns to SW node for true high-side gate control. |
| BOOST (15) | Top gate driver supply | Charged via external Schottky diode from DRVCC; bypassed with 0.1µF ceramic to SW for stable floating rail. |
| VIN (16) | High-voltage input sense | Not a power pin; feeds line feedforward path to improve line regulation and transient immunity up to 60V. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) voltage drop for current limiting - reduces BOM cost, PCB area, and conduction losses. |
| Patented line feedforward compensation | Instantaneously adjusts duty cycle to input voltage changes - eliminates output overshoot/undershoot during 25V→60V transients. |
| Programmable pulse skip mode | Automatically disables bottom MOSFET when inductor current reverses - improves light-load efficiency by >15% at 10mA. |
| Strong 1Ω gate drivers | Delivers >1A peak current with <200ns rise/fall times - enables use of large paralleled MOSFETs for >20A designs. |
| Independent BGRTN pin | Allows negative bias on bottom gate return - prevents false turn-on due to Miller coupling during high dV/dt at SW node. |
| Integrated soft-start and shutdown | Internal 4µA RUN/SS current source enables adjustable start-up time (≈750ms/µF); shutdown draws only 25µA. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Rail |
|---|---|
Use Scenario: Converting 36–75V telecom rectified input to stable 5V/12V intermediate bus for base station RF modules and backplane controllers. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-reliability DC/DC conversion with tight line regulation under rapid input transients. Use Value: 60V absolute max VIN and line feedforward ensure <50mV output deviation during 48V→72V surges; eliminates need for bulky pre-regulators. |
Use Scenario: Generating 3.3V/5V rails from 12V vehicle battery for camera ECU, radar processor, and sensor fusion units in autonomous driving systems. IC Role / Device Role / Timing Role: High-voltage buck controller delivering low-noise, thermally robust power with programmable frequency to avoid AM band interference. Use Value: Pulse skip mode extends idle battery life; –40°C to 85°C rating and undervoltage lockout (3.1V–3.7V) ensure cold-crank reliability. |
| Industrial PLC I/O Module | Networking Switch Midplane |
Use Scenario: Providing isolated 5V/24V auxiliary power from unregulated 24–60V DC field bus in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Robust step-down controller supporting wide input range, high ripple rejection, and fault-tolerant current limiting for mission-critical control hardware. Use Value: Programmable current limit via IMAX pin enables precise overcurrent protection matching I/O module load profiles without calibration. |
Use Scenario: Generating 1.2V/1.8V core voltages for ASICs and FPGAs from 12V midplane supply in enterprise Ethernet switches and routers. IC Role / Device Role / Timing Role: High-bandwidth voltage-mode controller enabling fast load transient response (<5µs recovery) for bursty packet-processing loads. Use Value: 25MHz error amplifier and optimized COMP compensation support >200kHz loop crossover - maintains regulation during 5A load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S | Higher integration (integrated MOSFETs), lower max VIN (42V), higher quiescent current (2.5µA vs 25µA in shutdown) | Better suited for compact, low-power DC/DC modules; not rated for 60V telecom input | Select LT8640S for space-constrained designs needing integrated power stage; LTC3703EG-5#PBF remains preferred for >48V input or high-current discrete MOSFET solutions. |
| TPS546D24 | Dual-output PMBus-enabled controller, 18V max VIN, no line feedforward, requires external current sense resistor | Targeted at data center VRMs with digital telemetry; lacks high-voltage capability and analog feedforward performance | Choose TPS546D24 for digitally managed, multi-rail server power; LTC3703EG-5#PBF is superior for analog-controlled, high-voltage industrial buck stages. |
Compared with LT8640S and TPS546D24, the LTC3703EG-5#PBF uniquely combines 60V operation, resistorless current sensing, and analog line feedforward - making it irreplaceable for high-reliability, high-input-voltage buck converters where digital control or integrated FETs are undesirable.
Availability
LTC3703EG-5#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS subsystems, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed E-grade temperature performance.
Supply support for LTC3703EG-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3703 family was engineered specifically for high-voltage synchronous buck conversion in telecom and automotive applications - emphasizing ruggedness, analog control fidelity, and elimination of lossy external components like current sense resistors.
FAQ
What is the maximum input voltage rating for the LTC3703EG-5#PBF?
The LTC3703EG-5#PBF has a maximum continuous input voltage (VIN) rating of 60V, with absolute maximum ratings extending to 70V for short durations (400ms). This makes the LTC3703EG-5#PBF suitable for direct step-down from 48V telecom distribution buses and 36V automotive systems without pre-regulation stages.
Does the LTC3703EG-5#PBF require an external current sense resistor?
No, the LTC3703EG-5#PBF does not require an external current sense resistor. It senses output current by measuring the voltage drop across the on-resistance (RDS(ON)) of the bottom synchronous MOSFET using the IMAX pin and an internal 12µA current source - reducing power loss, board area, and component count.
How is the switching frequency programmed on the LTC3703EG-5#PBF?
The switching frequency of the LTC3703EG-5#PBF is programmed using an external resistor (RSET) connected from the fSET pin (Pin 2) to ground. With RSET = 25kΩ, the nominal frequency is 300kHz; values from ~10kΩ to 100kΩ yield 100kHz to 600kHz. The oscillator can also be synchronized to an external clock applied to the MODE/SYNC pin.
What is the purpose of the BGRTN pin on the LTC3703EG-5#PBF?
The BGRTN pin on the LTC3703EG-5#PBF provides a dedicated return path for the bottom gate driver (BG), separate from system ground. Connecting a small negative bias (e.g., –2V) to BGRTN counteracts Miller-induced gate voltage spikes during high dV/dt switching at the SW node - preventing unintended turn-on and shoot-through in high-speed buck converters.
Can the LTC3703EG-5#PBF operate in boost configuration?
Yes, the LTC3703EG-5#PBF supports boost (step-up) operation via the INV pin (Pin 6). When INV is pulled above 2V, the controller reconfigures TG and BG outputs to drive a boost topology - with TG controlling the main switch and BG driving the synchronous rectifier - enabling bidirectional converter flexibility within the same IC footprint.
LTC3703EG-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3703EG-5#PBF FAQ
1.How can I place an order for LTC3703EG-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703EG-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 LTC3703EG-5#PBF reliable?
The price and inventory of LTC3703EG-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 LTC3703EG-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3703EG-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703EG-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703EG-5#PBF?
LTC3703EG-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703EG-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 LTC3703EG-5#PBF?
For technical support, including LTC3703EG-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703EG-5#PBF requirements.
6.How does Aetrix verify that LTC3703EG-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3703EG-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 LTC3703EG-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3703EG-5#PBF?
All LTC3703EG-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703EG-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 LTC3703EG-5#PBF part is unused and in its original packaging.
Return procedure for LTC3703EG-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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