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Analog Devices Inc. LTC3703HGN#TRPBF
- Part No.:
- LTC3703HGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3703HGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,452
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Product details
Overview
LTC3703HGN#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous step-down switching regulator controller supporting input voltages up to 100V, driving dual external N-channel MOSFETs in voltage-mode architecture with ±1% reference accuracy, programmable 100–600kHz switching frequency, and no current-sense resistor required - ideal for telecom power supplies and automotive 48V systems.
For engineers reviewing the LTC3703HGN#TRPBF datasheet, LTC3703HGN#TRPBF pinout, LTC3703HGN#TRPBF application, or LTC3703HGN#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal specs (–40°C to 150°C), real-world efficiency curves at 75VIN, and precise gate driver RDS(ON) values - all critical for high-reliability 100V buck converter design.
Technical Context
The LTC3703HGN#TRPBF implements voltage-mode control with patented line feedforward compensation, enabling instantaneous response to input voltage transients without overshoot. Its error amplifier features 25MHz unity-gain bandwidth and 85dB DC open-loop gain, paired with a 0.792–0.812V internal reference for 1% output regulation accuracy across temperature.
It integrates dual 1.5–2A peak gate drivers with 1Ω pull-down RDS(ON) for both top (TG) and bottom (BG) MOSFETs, supports pulse-skip or forced-continuous operation via MODE/SYNC pin, and senses current through synchronous MOSFET VDS - eliminating external sense resistors while maintaining cycle-by-cycle overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Input Voltage | 100V - enables direct conversion from telecom -48V nominal (up to 72V) or automotive 60V transients without pre-regulator |
| Reference Accuracy | ±1% (0.792–0.812V) - ensures stable 12V/5V/3.3V outputs without calibration or trimming |
| Switching Frequency | 100–600kHz (programmable) - balances inductor size, efficiency, and EMI filtering requirements |
| Gate Driver Strength | 2A peak source / 1Ω sink RDS(ON) - drives multiple parallel MOSFETs or high-Qg devices like Si7456DP with <200ns rise/fall times |
| Operating Temperature | –40°C to +150°C (H-grade) - qualified for under-hood automotive and base station power applications |
| Current Limit Sensing | Voltage drop across bottom MOSFET - eliminates 5–10mΩ sense resistor, saving PCB area and I2R loss |
| Shutdown Current | 50µA typical - meets low-power standby requirements in always-on telecom equipment |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 0.15mm max height, RoHS-compliant lead-free finish. Thermal resistance θJA = 110°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| MODE/SYNC | Pulse-skip enable / sync input | Pull <0.81V for forced continuous mode; accept 100–600kHz external clock for EMI reduction |
| fSET | Oscillator frequency programming | Resistor-to-ground sets free-running frequency (e.g., 25kΩ → 300kHz) |
| COMP | Error amplifier output | Connect RC network here to stabilize loop; supports >100kHz crossover for fast load steps |
| FB | Output voltage feedback | Divide VOUT to 0.8V reference; high-impedance input (<1µA) minimizes divider error |
| IMAX | Current limit threshold | 12µA internal source + external resistor sets overcurrent trip point (e.g., 10kΩ → 120mV) |
| INV | Buck/boost mode select | <1V = buck (TG = high-side); >2V = boost (TG = low-side) - enables dual topology reuse |
| RUN/SS | Enable / soft-start control | 0.9V threshold; internal 4µA current source charges CSS for controlled VOUT ramp |
| GND | Analog ground reference | Return for internal circuits; separate from BGRTN to avoid noise coupling into gate drive |
| BGRTN | Bottom gate driver return | Allows negative bias (e.g., –2V) to suppress Miller-induced shoot-through during high dV/dt |
| BG | Bottom gate driver output | Swings from BGRTN to DRVCC; drives synchronous MOSFET source directly |
| DRVCC | Bottom driver supply | 9.3–15V input; bypass with 10µF X5R ceramic to BGRTN for low-impedance gate drive |
| VCC | Main logic supply | 9.3–15V; powers error amp, oscillator, logic - bypass with 0.1µF near pin |
| SW | Switch node connection | Connects to inductor and bootstrap capacitor; handles 100V swing (–1V to 100V transient) |
| TG | Top gate driver output | Floating driver referenced to SW; powered by BOOST; drives high-side MOSFET gate |
| BOOST | Top gate driver supply | Bypass to SW with 0.1µF X5R; charged via Schottky diode from DRVCC for bootstrapping |
| VIN | High-voltage input sense | Connects to input rail; feeds line feedforward circuitry - not a power pin |
Key Features
| Feature | Design Value |
|---|---|
| No current-sense resistor | Uses bottom MOSFET RDS(ON) as current sensor - eliminates 5–10mΩ resistor, associated power loss, and layout sensitivity |
| Patented line feedforward | Compensates for input voltage changes in real time - reduces line transient overshoot to <50mV on 25V→75V step |
| 150°C junction-rated H-grade | Guaranteed operation up to 150°C junction temperature - supports placement near hot components in compact enclosures |
| Dual-mode operation | Select buck (INV <1V) or boost (INV >2V) with same IC - reduces BOM count for multi-rail systems |
| Programmable pulse-skip | Enables >90% efficiency at 10% load (75VIN/12VOUT) by skipping cycles instead of forcing reverse inductor current |
| Strong 2A gate drivers | Drives 5nC gate charge in <100ns - supports high-frequency operation with low-Qg MOSFETs like Si7456DP |
Applications
| Telecom Power Supply | Automotive 48V System |
|---|---|
Use Scenario: Converting –48V telecom rectified input to isolated 12V for line cards and fan controllers. IC Role / Device Role / Timing Role: Primary controller for non-isolated buck stage; regulates output using voltage-mode feedback with line feedforward. Use Value: 100V rating avoids need for pre-regulator; 1% reference ensures stable 12V under varying load and temperature. |
Use Scenario: Stepping down 48V battery rail to 12V for ADAS cameras and infotainment displays. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with pulse-skip mode for variable load profiles. Use Value: 150°C H-grade operation survives under-hood ambient; no sense resistor improves reliability in vibration-prone environments. |
| Industrial Motor Drive PSU | Base Station RF Power Amplifier |
Use Scenario: Generating 5V/3.3V auxiliary rails from 60–100V DC bus in servo drives. IC Role / Device Role / Timing Role: Secondary buck controller managing isolated auxiliary supplies; synchronized to main system clock via MODE/SYNC. Use Value: 600kHz sync capability eliminates beat frequencies with motor PWM; strong gate drivers support paralleled MOSFETs for >20A loads. |
Use Scenario: Providing stable 28V bias for GaN RF power amplifiers in 5G macro base stations. IC Role / Device Role / Timing Role: High-voltage buck controller delivering low-noise 28V with fast transient response to PA burst modes. Use Value: 25MHz error amplifier enables <10µs recovery from 50% load step; line feedforward maintains regulation during AC line sags. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3779IUFD#PBF | 4-phase interleaved controller; 40V max VIN; integrated MOSFET drivers; requires external VREF | Targeted at high-current (>40A), low-ripple server VRMs - not suitable for single-phase 100V inputs | Choose LTC3703HGN#TRPBF for cost-sensitive, single-phase 100V buck designs requiring minimal external components. |
| MPQ4316-AEC1 | Automotive-grade 60V buck controller; integrated 100V bootstrap diode; no line feedforward; 1.5% reference accuracy | Designed for AEC-Q100 Grade 1 (–40°C to +125°C); lacks 100V rating and precision feedforward for telecom use | Choose LTC3703HGN#TRPBF when 100V input, ±1% accuracy, and line transient immunity are mandatory. |
Compared with LTC3779IUFD#PBF and MPQ4316-AEC1, the LTC3703HGN#TRPBF uniquely combines 100V input tolerance, ±1% reference, and patented line feedforward - making it the only option for telecom-grade 48V/–48V systems requiring sub-50mV line transient response without pre-regulation.
Availability
LTC3703HGN#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, automotive 48V DC-DC converters, and industrial motor drive auxiliary rails requiring stable component supply across extended temperature ranges.
Supply support for LTC3703HGN#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 aerospace, industrial, and communications markets with precision timing and power solutions.
The LTC3703 belongs to Linear's high-voltage controller product line, designed specifically for robust, efficient DC/DC conversion in harsh environments - emphasizing 100V operation, no-sense-resistor current limiting, and thermal resilience up to 150°C.
FAQ
What is the maximum input voltage supported by the LTC3703HGN#TRPBF?
The LTC3703HGN#TRPBF supports a maximum input voltage of 100V on the VIN pin, as specified in its Absolute Maximum Ratings and confirmed across all operating conditions. This allows direct step-down from telecom –48V nominal (with 72V transients) or automotive 60V battery systems without intermediate regulation. The device maintains full functionality and protection features - including undervoltage lockout and overtemperature shutdown - throughout this range.
Does the LTC3703HGN#TRPBF require an external current-sense resistor?
No, the LTC3703HGN#TRPBF does not require an external current-sense resistor. It implements current limiting by monitoring the voltage drop across the bottom synchronous MOSFET's RDS(ON), using the IMAX pin with a single external resistor to set the trip threshold. This eliminates power loss, board space, and layout sensitivity associated with traditional sense resistors - a key differentiator confirmed in the datasheet's "No Current Sense Resistor Required" feature list and electrical characteristics table.
What package and temperature grade does LTC3703HGN#TRPBF use?
The LTC3703HGN#TRPBF uses a 16-lead narrow plastic SSOP (GN) package and is rated for operation from –40°C to +150°C junction temperature (H-grade). This is explicitly stated in the Order Information table, where "HGN" denotes the high-temperature variant, and confirmed by the absolute maximum junction temperature (TJMAX = 150°C) and thermal resistance (θJA = 110°C/W) in the datasheet.
How does the LTC3703HGN#TRPBF achieve fast line transient response?
The LTC3703HGN#TRPBF achieves fast line transient response through patented line feedforward compensation, which dynamically adjusts the duty cycle in real time based on input voltage changes - demonstrated in Figure 2 showing <50mV overshoot during a 25V→60V input step. This architecture decouples loop gain from VIN, enabling stable regulation without waiting for feedback correction, unlike conventional voltage-mode controllers.
Can the LTC3703HGN#TRPBF be used in boost configuration?
Yes, the LTC3703HGN#TRPBF supports boost operation via the INV pin: pulling INV above 2V configures the controller for step-up mode, where TG drives the low-side switch and BG drives the high-side switch. This dual-mode capability is documented in the Pin Functions section and Functional Diagram, enabling reuse in applications requiring both buck and boost topologies - such as bidirectional power stages or multi-output converters.
LTC3703HGN#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):
- 9.3V ~ 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3703HGN#TRPBF FAQ
1.How can I place an order for LTC3703HGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3703HGN#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 LTC3703HGN#TRPBF reliable?
The price and inventory of LTC3703HGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3703HGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3703HGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3703HGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3703HGN#TRPBF?
LTC3703HGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3703HGN#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 LTC3703HGN#TRPBF?
For technical support, including LTC3703HGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3703HGN#TRPBF requirements.
6.How does Aetrix verify that LTC3703HGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3703HGN#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 LTC3703HGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3703HGN#TRPBF?
All LTC3703HGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3703HGN#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 LTC3703HGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3703HGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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