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Analog Devices Inc. LTC7103HUHE#TRPBF
- Part No.:
- LTC7103HUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103HUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,968
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Product details
Overview
LTC7103HUHE#TRPBF from Analog Devices is a 105V, 2.3A monolithic synchronous step-down DC/DC converter with average current mode control. It operates from 4.4V to 105V input, delivers 1V to VIN adjustable output, achieves 40ns minimum on-time and 100% duty cycle, and targets high-reliability automotive, industrial, and avionics power supplies requiring ultralow EMI and wide-input operation.
For engineers reviewing the LTC7103HUHE#TRPBF datasheet, LTC7103HUHE#TRPBF pinout, LTC7103HUHE#TRPBF application, or LTC7103HUHE#TRPBF equivalent, key selection criteria include its 150°C junction-rated QFN package, programmable 200kHz–2MHz switching frequency, no external sense resistor for current monitoring, CISPR25-compliant radiated emissions, and EXTVCC LDO support for high-efficiency bootstrapped operation.
Technical Context
The LTC7103HUHE#TRPBF implements constant-frequency average current mode control using internal top/bottom MOSFET current sensing and lossless inductor current reconstruction-enabling precise, resistorless current programming and fast transient response without external RSENSE. Its architecture supports ultralow duty-cycle operation via a dedicated RIND-based ramp generator and maintains regulation down to 1V output across the full 4.4V–105V input range.
It integrates dual LDOs (VIN- and EXTVCC-powered INTVCC), PLL synchronization (200kHz–2MHz), OPTI-LOOP® or fixed internal compensation, and comprehensive protection including input/output overvoltage, thermal shutdown, and brick-wall current limiting. The H-grade variant guarantees operation from –40°C to 150°C junction temperature with 38°C/W θJA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 96V industrial/automotive battery rails without pre-regulation. |
| Output Current | Up to 2.3A continuous - enables single-chip 5V/2.3A or 12V/2A conversion in compact layouts. |
| Switching Frequency | 200kHz to 2MHz - selectable via FREQ pin resistor; allows optimization of size (high-f) vs. efficiency (low-f) and EMI filtering. |
| Min On-Time | 40ns - enables stable 1V@100V input (1% duty cycle) without pulse-skipping instability. |
| Quiescent Current | 2µA at 48VIN/3.3VOUT - extends battery life in always-on systems such as telematics and sensor nodes. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emission limits without added shielding or complex layout. |
| Junction Temp Range | –40°C to 150°C - qualified for under-hood automotive, avionics, and heavy-equipment environments. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37), thermally enhanced for 150°C operation (θJA = 38°C/W). Exposed pad must be soldered to PCB ground plane for rated electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable/Shutdown Control | Holding <1.1V disables regulator; <0.7V reduces IQ to 0.7µA - enables precise undervoltage lockout via resistor divider from VIN. |
| VIN (30,31,32) | Main Power Input | Connects to 4.4V–105V source; powers high-side MOSFET and internal VIN LDO generating INTVCC. |
| SW (24,25,26) | Power Switch Node | Drives external inductor; connects internally to top/bottom N-MOSFETs - requires low-inductance layout and 0.1µF BOOST capacitor. |
| EXTVCC (20) | External Bias Input | Accepts 3.1V–40V supply (e.g., VOUT) to power INTVCC via dedicated LDO - improves efficiency and reduces VIN LDO dissipation. |
| ICTRL (16) | Average Current Setpoint | 0.4V–1.3V input programs 0A–2.5A average output current - eliminates need for external current-sense resistor and amplifier. |
| IMON (17) | Current Monitor Output | 0.4V–1.3V analog voltage proportional to average output current (0A–2.5A) - enables real-time load monitoring and fault logging. |
| FREQ (11) | Frequency Programming | Sources 40µA; resistor to SGND sets fSW from 200kHz to 2MHz - supports EMI spread-spectrum tuning and multi-phase synchronization. |
| PLLIN/MODE (12) | Sync Clock Input / Light-Load Mode Select | Accepts external clock (200kHz–2MHz) for phase alignment; also selects Burst Mode (float/SGND) or pulse-skipping (INTVCC via 100kΩ). |
| PGOOD (14) | Open-Drain Status Flag | Pulled low when VFB deviates >10% from target - provides system-level power-good signaling for sequenced startup or fault isolation. |
| PGND/Exposed Pad (35,36,37) | Power Ground Return | Primary return path for high-current switch node and internal LDOs - must be solidly connected to PCB ground plane for thermal and EMI integrity. |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Internal average current sensing and monitoring (ICTRL/IMON) eliminates RSENSE, saving board space and eliminating sense-resistor power loss and drift. |
| Ultralow EMI design | Integrated slew-rate control, optimized gate drive, and Silent Switcher®-inspired layout reduce radiated emissions to meet CISPR25 Class 5 without ferrites or shields. |
| 100% duty cycle capability | Charge-pump boosted gate drive sustains top MOSFET conduction indefinitely - enables dropout-free operation during cold-crank or brownout conditions. |
| Programmable light-load mode | Selectable Burst Mode® (low ripple) or pulse-skipping (higher efficiency) optimizes trade-off between output ripple and quiescent current at <10mA loads. |
| Robust protection suite | Includes input/output overvoltage lockout (OVLO/VOV(R)), thermal shutdown, reverse-current prevention, and brick-wall current limiting - enhances system reliability in harsh environments. |
| Flexible voltage programming | Eight pin-selectable fixed outputs (1.2V–15V) or fully adjustable 1V–VIN via VFB divider - simplifies BOM management across multiple output requirements. |
Applications
| Battery Charger CC/CV Stage | Automotive ADAS Power Supply |
|---|---|
Use Scenario: High-voltage battery charger front-end delivering constant current (CC) then constant voltage (CV) to Li-ion or lead-acid packs. IC Role / Device Role / Timing Role: Primary buck regulator controlling charge current via ICTRL and monitoring actual current via IMON - replaces discrete op-amp + sense resistor loop. Use Value: Enables accurate ±1% current regulation without sense resistor drift or PCB heating; 105V input withstands load-dump transients up to 110V. |
Use Scenario: Powering radar, camera, and domain controller modules in vehicles with 12V/24V/48V architectures and strict CISPR25 EMI limits. IC Role / Device Role / Timing Role: Main 5V/2.3A or 3.3V/2A supply with synchronized switching (via PLLIN) to avoid beat frequencies in multi-rail systems. Use Value: Meets Class 5 radiated emission limits without added filters; H-grade 150°C rating ensures operation near engine bay heat sources. |
| Industrial PLC I/O Module | Avionics Remote Power Node |
Use Scenario: Distributed 24V-to-5V/3.3V conversion in programmable logic controllers with wide ambient temperature swings and long service life requirements. IC Role / Device Role / Timing Role: Isolated point-of-load regulator with EXTVCC bootstrapping from VOUT to minimize power loss and thermal stress on VIN LDO. Use Value: 2µA quiescent current extends uptime in battery-backed modules; 40ns min on-time supports 24V→3.3V (14% duty) with clean regulation. |
Use Scenario: Powering mission-critical sensors and comms interfaces in aircraft where reliability, radiation tolerance, and thermal margin are paramount. IC Role / Device Role / Timing Role: High-reliability 28V-to-5V/12V converter with redundant OVLO monitoring and 150°C guaranteed operation. Use Value: MP-grade qualification path available; exposed-pad QFN ensures low thermal resistance in conduction-cooled avionics chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | 4–60V input, 10A peak, no integrated MOSFETs; requires external high-side/low-side FETs and sense resistor. | Used where higher current (>2.3A) or custom FET selection is needed; lacks integrated current monitor and EXTVCC LDO. | Select when board space allows discrete FETs and design requires >2.3A or >60V input - not drop-in; requires redesign of power stage and current sensing. |
| LM5164QPWPRQ1 | 3–100V input, 350mA max, integrated FETs; no average current mode, no ICTRL/IMON, no EXTVCC input. | Targeted at low-power automotive body electronics; lacks precision current control and high-temp rating. | Select only for sub-500mA loads where cost and footprint are critical - cannot replace LTC7103HUHE#TRPBF in 2.3A or current-programmed applications. |
Compared with LTC3891EFE#PBF and LM5164QPWPRQ1, the LTC7103HUHE#TRPBF uniquely combines 105V input, 2.3A integrated power stage, resistorless average current programming, and 150°C operation - making it the only single-chip solution for high-reliability, high-current, wide-VIN industrial and automotive buck conversion.
Availability
LTC7103HUHE#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, industrial PLCs, and avionics remote power nodes requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for LTC7103HUHE#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7103HUHE#TRPBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC regulator family, designed specifically for demanding applications requiring ultrawide input range, low EMI, and robust operation in extreme temperature environments.
FAQ
What is the maximum input voltage rating for the LTC7103HUHE#TRPBF?
The LTC7103HUHE#TRPBF has an absolute maximum input voltage rating of 110V and a specified operating input voltage range of 4.4V to 105V. This allows direct connection to 48V, 72V, and 96V battery systems while surviving automotive load-dump transients up to 110V. Operation beyond 105V is not guaranteed and may trigger internal protection circuits.
Does the LTC7103HUHE#TRPBF require an external current-sense resistor?
No, the LTC7103HUHE#TRPBF does not require an external current-sense resistor. It uses internal lossless sensing of the top and bottom MOSFET currents combined with inductor current reconstruction to enable accurate average current programming (via ICTRL pin) and monitoring (via IMON pin) - eliminating RSENSE placement, power loss, and temperature drift.
How does the EXTVCC pin improve efficiency in the LTC7103HUHE#TRPBF?
The EXTVCC pin on the LTC7103HUHE#TRPBF accepts 3.1V–40V input (e.g., VOUT) to power the INTVCC rail via a dedicated LDO, bypassing the higher-loss VIN LDO. This reduces power dissipation in the IC, especially at high input voltages like 48V or 72V, and improves full-load efficiency by up to 2–3% compared to VIN-only biasing.
What is the purpose of the RIND pin on the LTC7103HUHE#TRPBF?
The RIND pin on the LTC7103HUHE#TRPBF sets the internal ramp current used to replicate the inductor's up-slope during low-duty-cycle operation. A resistor from RIND to SGND equal to 1/(7.5·L) calibrates this ramp, ensuring stable average current mode control at very high step-down ratios (e.g., 100V→3.3V). It is required when VPRG1/VPRG2 are floating (adjustable mode).
Can the LTC7103HUHE#TRPBF synchronize to an external clock?
Yes, the LTC7103HUHE#TRPBF supports external clock synchronization via the PLLIN/MODE pin. When an external clock (200kHz–2MHz) is applied, its phase-locked loop aligns the rising edge of the SW signal to the external clock edge. This enables deterministic EMI reduction and coordinated switching in multi-regulator systems - a feature confirmed in the device's functional diagram and electrical characteristics table.
LTC7103HUHE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN, 26 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.4V
- Voltage - Input (Max):
- 105V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 105V
- Current - Output:
- 2.3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC7103HUHE#TRPBF FAQ
1.How can I place an order for LTC7103HUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103HUHE#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 LTC7103HUHE#TRPBF reliable?
The price and inventory of LTC7103HUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103HUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7103HUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103HUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103HUHE#TRPBF?
LTC7103HUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103HUHE#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 LTC7103HUHE#TRPBF?
For technical support, including LTC7103HUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103HUHE#TRPBF requirements.
6.How does Aetrix verify that LTC7103HUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7103HUHE#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 LTC7103HUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7103HUHE#TRPBF?
All LTC7103HUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103HUHE#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 LTC7103HUHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7103HUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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