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Analog Devices Inc. LTC3703IG-5#TRPBF
- Part No.:
- LTC3703IG-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC3703IG-5#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
LTC3703IG-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 switching from 100kHz to 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 LTC3703IG-5#TRPBF datasheet, LTC3703IG-5#TRPBF pinout, LTC3703IG-5#TRPBF application, or LTC3703IG-5#TRPBF 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 support for pulse-skip or forced-continuous operation modes.
Technical Context
The LTC3703IG-5#TRPBF implements a voltage-mode control architecture with line feedforward compensation to deliver fast line transient response and input-voltage-independent loop gain. Its error amplifier features 25MHz unity-gain bandwidth and 74–85dB DC open-loop gain, enabling high crossover frequency loop design with low-value inductors.
It integrates two independent gate drivers: a floating high-side TG driver powered from BOOST (capable of 60V swing) and a low-side BG driver referenced to BGRTN, each delivering ≥0.75A 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.
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 regulation of output voltages down to 0.8V without external level-shifting circuitry. |
| Switching Frequency | 100kHz to 600kHz, programmable via fSET resistor - allows optimization of inductor size, efficiency, and EMI profile. |
| Gate Driver RDS(ON) | ≤1.8Ω (TG & BG) - ensures fast MOSFET turn-off and robust shoot-through immunity in high-dV/dt environments. |
| Current Limit Sensing | Voltage-based, no external sense resistor - reduces power loss and board area by using bottom MOSFET RDS(ON) as current shunt. |
| Shutdown Current | 25µA typical - minimizes system standby power in always-on automotive or network infrastructure applications. |
| Operating Temp Range | –40°C to +125°C (junction) - qualified for under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: 28-Lead Plastic SSOP (G package), RoHS-compliant, thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Floating high-side driver supply | Provides bias for TG driver; must be bypassed to SW with 0.1µF ceramic capacitor; supports up to 95V transient. |
| TG | Top gate drive output | Drives gate of high-side N-MOSFET; swings from SW to BOOST; requires external bootstrap diode from DRVCC. |
| SW | Switch node connection | Connects to inductor and bootstrap capacitor; voltage swings from –1V (Schottky drop) to VIN (70V max continuous). |
| BG | Bottom gate drive output | Drives gate of low-side N-MOSFET; swings from BGRTN to DRVCC; supports negative BGRTN for Miller immunity. |
| BGRTN | Bottom gate return reference | Separate return path for BG driver; enables connection to negative supply (e.g., –2V) to suppress false turn-on during dV/dt events. |
| DRVCC | Low-side driver supply | Power source for BG driver; must be 4.5V–15V; bypassed to BGRTN with 10µF X5R ceramic capacitor. |
| VIN | High-voltage input sense | Not a power pin; feeds line feedforward circuitry to improve line regulation; accepts up to 70V continuous. |
| IMAX | Current limit threshold set | Internal 12µA current source pulls up to ground via RIMAX; sets overcurrent trip point by comparing to bottom FET VDS. |
| RUN/SS | Enable and soft-start control | Pull below 0.9V to shut down (25µA IQ); internal 4µA current source charges CSS for controlled startup ramp. |
Key Features
| Feature | Design Value |
|---|---|
| No current sense resistor required | Uses bottom MOSFET RDS(ON) as current shunt - eliminates power loss, PCB area, and thermal derating concerns of discrete sense resistors. |
| Programmable pulse-skip mode | Enables high light-load efficiency by disabling bottom FET when inductor current reverses - avoids reverse conduction losses in buck topology. |
| Patented line feedforward compensation | Instantly adjusts duty cycle on input voltage transients - maintains <50mV output deviation during 25V→60V VIN steps (20µs/div). |
| Strong 1Ω gate drivers | Supports paralleling of multiple MOSFETs for >20A output designs - reduces gate drive loop inductance and transition time. |
| Undervoltage lockout with hysteresis | VUV+ = 3.7V, VUV– = 3.1V, 0.65V hysteresis - prevents erratic startup/shutdown during brown-out conditions in automotive systems. |
Applications
| 48V Telecom Power Supply | Automotive ADAS Power Rail |
|---|---|
Use Scenario: Generating stable 5V/12V intermediate bus from 48V telecom rectified input in base station RF modules. IC Role / Device Role / Timing Role: Synchronous buck controller managing dual N-MOSFET power stage with 60V input tolerance and 300kHz fixed-frequency operation. Use Value: Eliminates need for isolated pre-regulator; achieves >94% efficiency at 5A load with minimal thermal stress due to 1Ω drivers and 110°C/W θJA. |
Use Scenario: Powering radar sensor ECUs in engine compartments where ambient temperature reaches 105°C and input varies from 24V–42V. IC Role / Device Role / Timing Role: High-reliability step-down controller with –40°C to +125°C junction rating, UVLO hysteresis, and BGRTN-driven Miller immunity. Use Value: Ensures uninterrupted operation during cold-crank (4.5V) and load-dump (60V) events; negative BGRTN prevents shoot-through during high dV/dt switching. |
| Industrial PLC I/O Module | Networking Switch ASIC Core Supply |
Use Scenario: Providing 3.3V/10A regulated rail from 24V industrial bus with strict ripple (<20mVpp) and transient (<5% deviation) requirements. IC Role / Device Role / Timing Role: Voltage-mode controller with 25MHz error amplifier and line feedforward - enables wide-bandwidth loop compensation for sub-10µs recovery. Use Value: Delivers 92% efficiency at full load while maintaining <15mV overshoot on 5A load step - meets IEC 61000-4-4 immunity requirements. |
Use Scenario: Generating 1.2V/25A core voltage for multi-gigabit Ethernet switch ASICs with tight dynamic voltage positioning (DVP) specs. IC Role / Device Role / Timing Role: Programmable-frequency (500kHz) buck controller driving paralleled Si7850DP MOSFETs with soft-start and cycle-by-cycle current limiting. Use Value: Supports fast soft-start (750ms/µF) and instantaneous current limit (50mV comparator threshold) - prevents ASIC latch-up during power-up and fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP24894GS-Z | 40V max input, integrated MOSFETs, 500kHz fixed frequency, no IMAX-based current sensing | Suitable for space-constrained 12V–24V systems; lacks high-voltage capability and programmable current limit | Select when board area is critical and input voltage stays ≤40V; not suitable for 48V telecom or automotive battery direct connection. |
| LTC3891IFE#PBF | 60V input, dual-output, includes LDO for bias supply, higher quiescent current (45µA shutdown) | Designed for multi-rail industrial systems requiring auxiliary 3.3V/5V outputs alongside main buck | Choose when secondary regulated output or integrated bias LDO is needed; shares same 60V rating but adds complexity and cost. |
Compared with MP24894GS-Z and LTC3891IFE#PBF, the LTC3703IG-5#TRPBF uniquely combines 60V input tolerance, external MOSFET flexibility, resistor-programmable current limit, and ultra-low 25µA shutdown current - making it optimal for high-reliability, high-input-voltage, discrete-power-stage designs.
Availability
LTC3703IG-5#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, automotive ADAS modules, and industrial PLC I/O systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3703IG-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 precision instrumentation, communications, and industrial markets.
The LTC3703-5 product line was engineered specifically for high-input-voltage synchronous buck conversion in telecom infrastructure and harsh-environment automotive applications - emphasizing reliability, wide temperature operation, and elimination of lossy current sense elements.
FAQ
What is the maximum input voltage rating for the LTC3703IG-5#TRPBF?
The LTC3703IG-5#TRPBF supports up to 60V continuous input voltage on the VIN pin, with absolute maximum ratings of 70V continuous and 80V for 400ms transients. This enables direct connection to 48V telecom rectified buses and 36V automotive battery systems without pre-regulation stages. Exceeding 60V continuous violates the specified operating range and may impact long-term reliability.
Does the LTC3703IG-5#TRPBF require an external current sense resistor?
No, the LTC3703IG-5#TRPBF does not require an external current sense resistor. It senses output current by monitoring the voltage drop across the bottom N-channel MOSFET's RDS(ON) using the IMAX pin and internal 12µA current source. This eliminates power loss, board space, and thermal management issues associated with discrete sense resistors - a key differentiator for high-efficiency, high-current designs.
How is the switching frequency programmed on the LTC3703IG-5#TRPBF?
The switching frequency of the LTC3703IG-5#TRPBF is set using an external resistor (RSET) connected from the fSET pin (Pin 2 in GN16, Pin 7 in G28) to ground. With RSET = 25kΩ, the nominal frequency is 300kHz; values from ~10kΩ to 100kΩ yield 100kHz–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 LTC3703IG-5#TRPBF?
The BGRTN pin on the LTC3703IG-5#TRPBF provides a dedicated return path for the bottom gate (BG) driver, separate from system ground. Connecting BGRTN to a small negative supply (e.g., –2V) raises the effective threshold for Miller-induced false turn-on of the bottom MOSFET during high dV/dt transitions at the SW node - significantly improving shoot-through immunity in high-frequency, high-voltage buck converters.
What temperature range is guaranteed for the LTC3703IG-5#TRPBF?
The LTC3703IG-5#TRPBF is specified for operation from –40°C to +125°C junction temperature. As an "I" grade part, it is fully tested and guaranteed across this full range - unlike the "E" grade (–40°C to +85°C). This makes the LTC3703IG-5#TRPBF suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed 100°C.
LTC3703IG-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm 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:
- 28-SSOP
LTC3703IG-5#TRPBF FAQ
1.How can I place an order for LTC3703IG-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703IG-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 LTC3703IG-5#TRPBF reliable?
The price and inventory of LTC3703IG-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 LTC3703IG-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703IG-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703IG-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703IG-5#TRPBF?
LTC3703IG-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703IG-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 LTC3703IG-5#TRPBF?
For technical support, including LTC3703IG-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703IG-5#TRPBF requirements.
6.How does Aetrix verify that LTC3703IG-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703IG-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 LTC3703IG-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703IG-5#TRPBF?
All LTC3703IG-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703IG-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 LTC3703IG-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703IG-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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