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Analog Devices Inc. LTC3703IG-5#PBF
- Part No.:
- LTC3703IG-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3703IG-5#PBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,608
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Product details
Overview
LTC3703IG-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 with 1Ω gate drivers - enabling efficient 5V/5A conversion in base station power modules.
For engineers reviewing the LTC3703IG-5#PBF datasheet, LTC3703IG-5#PBF pinout, LTC3703IG-5#PBF application, or LTC3703IG-5#PBF equivalent, key selection considerations include its 60V max VIN rating, voltage-mode control architecture, no-current-sense-resistor current limiting, programmable soft-start, and compatibility with logic-level MOSFETs in narrow SSOP-16 packaging.
Technical Context
The LTC3703IG-5#PBF implements a constant-frequency voltage-mode control loop with patented line feedforward compensation, delivering fast line and load transient response without requiring current-sense resistors. Its error amplifier features 85dB DC open-loop gain and 25MHz unity-gain bandwidth, enabling stable loop compensation across wide input/output conditions.
It integrates dual independent gate drivers: a floating high-side TG driver (capable of 1A peak source, 1.8Ω pull-down RDS(ON)) powered from BOOST/SW, and a low-side BG driver referenced to BGRTN (1A peak source, 1.8Ω RDS(ON)) powered from DRVCC. The IMAX pin enables current limit programming via a single resistor using the bottom MOSFET's RDS(ON) as the sense element.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 60V continuous - enables direct step-down from 48V telecom or 36V automotive battery rails without pre-regulation. |
| Reference Voltage | 0.800V ±1% - supports accurate regulation of low-output voltages (e.g., 0.8V–12V) without external level-shifting circuitry. |
| Switching Frequency | 100kHz–600kHz, programmable via fSET resistor - allows optimization of inductor size, efficiency, and EMI profile. |
| Gate Driver Strength | 1Ω typical pull-down impedance per driver - ensures fast MOSFET turn-off, minimizing shoot-through risk and conduction losses. |
| Current Limit Method | Voltage drop sensing across bottom MOSFET (no external sense resistor) - reduces BOM cost and PCB area while maintaining cycle-by-cycle protection. |
| Shutdown Current | 25µA typical - enables ultra-low-power standby in always-on automotive or networking systems. |
| Operating Temp Range | –40°C to 125°C junction - qualified for under-hood automotive and industrial environments with full parameter guarantee. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN package), 5.0mm × 6.2mm body, 0.65mm pitch, RoHS-compliant, lead-free (Pb-free).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse skip enable / sync input | Enables forced continuous or pulse-skip mode; accepts external 100–600kHz clock for EMI reduction. |
| fSET | Oscillator frequency set | Resistor-to-ground sets free-running frequency; determines inductor sizing and ripple trade-offs. |
| COMP | Error amplifier output | Connects to RC compensation network; controls loop stability and transient response speed. |
| FB | Feedback input | Monitors output voltage via resistor divider; compared against internal 0.8V reference for regulation. |
| IMAX | Current limit threshold | 12µA internal current source sets overcurrent trip point using single resistor to ground. |
| INV | Mode select (buck/boost) | Logic-high (>2V) configures boost topology; logic-low (<1V) selects buck operation. |
| RUN/SS | Enable / soft-start | Pull below 0.9V shuts down IC; capacitor to ground provides controlled ramp-up of output voltage. |
| GND | Analog ground reference | Primary return for internal analog circuits; must be connected to low-impedance system ground plane. |
| 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 of low-side N-MOSFET; swings from BGRTN to DRVCC (4.5V–15V). |
| DRVCC | Driver supply input | Provides power to BG driver; bypassed to BGRTN with ≥10µF low-ESR ceramic capacitor. |
| VCC | Main supply input | Powers all internal logic and analog blocks (except drivers); requires ≥0.1µF local bypass to GND. |
| SW | Switch node connection | Connects to inductor and bootstrap capacitor; handles full VIN swing (–1V to 70V transient). |
| TG | Top gate drive output | Floats with SW node; drives gate of high-side N-MOSFET using BOOST-supplied charge pump. |
| BOOST | Top gate driver supply | Charged via external Schottky diode from DRVCC; bypassed to SW with 0.1µF low-ESR ceramic. |
| VIN | High-voltage input 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 | Uses bottom MOSFET RDS(ON) as current sense element - eliminates power loss, board space, and cost of discrete shunt. |
| Programmable soft-start | Internal 4µA RUN/SS current source charges external capacitor - prevents inrush current and output overshoot during power-up. |
| Line feedforward compensation | Patented real-time duty-cycle adjustment based on VIN - achieves <50mV output deviation during 25V→60V input transients. |
| Selective pulse-skip mode | Automatically disables at light loads to reduce switching losses - improves light-load efficiency by >15% vs forced-continuous mode. |
| Undervoltage lockout | 3.7V (rising) / 3.1V (falling) VCC UVLO with 0.65V hysteresis - prevents erratic operation during brown-out or startup. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Module |
|---|---|
|
Use Scenario: Converting 48V intermediate bus to 5V/5A for baseband processors and FPGAs in 5G remote radio units. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-reliability DC/DC conversion with tight output regulation. Use Value: Enables direct 48V-to-5V conversion without pre-regulator stage, reducing component count and improving system efficiency by >3% at full load. |
Use Scenario: Generating 3.3V/3A from 12V vehicle battery for radar sensor SoCs in autonomous driving ECUs. IC Role / Device Role / Timing Role: High-voltage buck controller providing robust, temperature-stable output under wide input (6–16V) and load transients. Use Value: Delivers guaranteed operation from –40°C to 125°C junction, meeting AEC-Q100 Grade 1 requirements for safety-critical ADAS subsystems. |
| Industrial PLC I/O Power | Networking Switch ASIC Supply |
|
Use Scenario: Stepping down 24V industrial rail to 1.2V/10A for FPGA-based motion control logic in programmable logic controllers. IC Role / Device Role / Timing Role: Voltage-mode controller driving paralleled MOSFETs to support high-current, low-noise digital core supplies. Use Value: Strong 1Ω gate drivers allow parallel MOSFET configurations without gate driver ICs, simplifying thermal design and layout. |
Use Scenario: Providing 1.8V/8A power to Ethernet switch ASICs in enterprise rack-mounted switches operating from 48V PoE++ infrastructure. IC Role / Device Role / Timing Role: Synchronous buck controller synchronized to system clock to minimize spectral noise coupling into high-speed SerDes lanes. Use Value: External SYNC capability enables deterministic EMI placement at fixed frequencies, easing FCC/CE compliance 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 |
|---|---|---|---|
| MP2451DT-LF-Z | 36V max VIN, integrated MOSFETs, fixed 2MHz frequency, no IMAX current limit programming. | Suitable for lower-input-voltage, space-constrained designs where integration outweighs flexibility. | Choose MP2451DT-LF-Z only if input ≤36V and integrated FETs meet current/power needs; lacks LTC3703IG-5#PBF's 60V rating and programmable current limit. |
| LTC3891IFE#PBF | 60V max VIN, dual-output, includes LDO bias supply, higher quiescent current (45µA), different pinout. | Preferred for multi-rail systems requiring auxiliary 3.3V/5V outputs alongside main buck channel. | Choose LTC3891IFE#PBF when dual-output capability or integrated bias LDO is required; not pin-compatible with LTC3703IG-5#PBF. |
Compared with MP2451DT-LF-Z and LTC3891IFE#PBF, the LTC3703IG-5#PBF uniquely combines 60V operation, external MOSFET flexibility, resistor-programmable current limit, and ultra-low 25µA shutdown current - making it optimal for high-reliability, high-input-voltage, discrete-FET buck designs where thermal management and long-term stability are critical.
Availability
LTC3703IG-5#PBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS modules, and industrial PLC I/O power systems requiring stable component supply, extended temperature qualification, and long-lifecycle availability.
Supply support for LTC3703IG-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3703 product line was developed specifically for high-voltage, synchronous buck controller applications in telecom infrastructure, automotive electronics, and industrial power systems - emphasizing reliability, wide input range, and minimal external component count.
FAQ
What is the maximum input voltage supported by the LTC3703IG-5#PBF?
The LTC3703IG-5#PBF supports up to 60V continuous input voltage, with absolute maximum ratings extending to 70V for short durations (400ms). This enables direct step-down from standard 48V telecom and 36V automotive battery rails without pre-regulation stages, distinguishing it from lower-voltage controllers like the MP2451DT-LF-Z.
Does the LTC3703IG-5#PBF require an external current sense resistor?
No, the LTC3703IG-5#PBF eliminates the need for an external current sense resistor by using the voltage drop across the bottom synchronous MOSFET's RDS(ON) to implement current limiting. An internal 12µA current source at the IMAX pin allows precise threshold setting with a single resistor to ground - reducing BOM cost, PCB area, and power loss.
What package type and lead count does the LTC3703IG-5#PBF use?
The LTC3703IG-5#PBF uses a 16-lead narrow plastic SSOP (GN package), measuring 5.0mm × 6.2mm with 0.65mm lead pitch. This compact, surface-mount package supports high-density layouts and is RoHS-compliant and lead-free (Pb-free), matching the footprint of other Linear/Analog Devices GN-series controllers.
How does the LTC3703IG-5#PBF achieve fast line transient response?
The LTC3703IG-5#PBF achieves fast line transient response through patented line feedforward compensation, which dynamically adjusts the duty cycle in real time based on instantaneous VIN changes. Combined with a 25MHz error amplifier bandwidth and high-gain voltage-mode control, this architecture limits output deviation to under 50mV during rapid 25V→60V input steps - critical for telecom and industrial applications.
What is the operating temperature range guaranteed for the LTC3703IG-5#PBF?
The LTC3703IG-5#PBF is guaranteed to operate over a junction temperature range of –40°C to 125°C (I-grade), with full electrical specifications assured across this range. This qualification meets AEC-Q100 Grade 1 requirements and supports deployment in under-hood automotive, base station, and industrial environments where ambient temperatures exceed 85°C.
LTC3703IG-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC3703IG-5#PBF FAQ
1.How can I place an order for LTC3703IG-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703IG-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 LTC3703IG-5#PBF reliable?
The price and inventory of LTC3703IG-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 LTC3703IG-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3703IG-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703IG-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703IG-5#PBF?
LTC3703IG-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703IG-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 LTC3703IG-5#PBF?
For technical support, including LTC3703IG-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703IG-5#PBF requirements.
6.How does Aetrix verify that LTC3703IG-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3703IG-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 LTC3703IG-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3703IG-5#PBF?
All LTC3703IG-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703IG-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 LTC3703IG-5#PBF part is unused and in its original packaging.
Return procedure for LTC3703IG-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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