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Analog Devices Inc. LTC7103IUHE#TRPBF
- Part No.:
- LTC7103IUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103IUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,991
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Product details
Overview
LTC7103IUHE#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter with average current mode control, operating from 4.4V to 105V input and delivering up to 2.3A at adjustable 1V–VIN output. It features 40ns minimum on-time, 100% duty cycle capability, and integrated current programming/monitoring without external sense resistor - enabling high-ratio conversion in battery chargers and industrial power supplies.
For engineers reviewing the LTC7103IUHE#TRPBF datasheet, LTC7103IUHE#TRPBF pinout, LTC7103IUHE#TRPBF application, or LTC7103IUHE#TRPBF equivalent, key selection criteria include ultralow EMI (CISPR25-compliant), programmable 200kHz–2MHz switching frequency, fast average current loop response, EXTVCC LDO support for efficiency optimization, and thermal robustness in automotive and avionics systems.
Technical Context
The LTC7103IUHE#TRPBF implements constant-frequency average current mode control using internal reconstruction of inductor current via top/bottom switch sensing and RIND-based ramp generation - eliminating need for external current sense components. Its dual LDO architecture (VIN- and EXTVCC-powered INTVCC) enables efficient operation across wide input ranges while supporting 100% duty cycle via charge-pump-assisted BOOST supply.
Control logic integrates PLL synchronization (via PLLIN/MODE), selectable light-load modes (Burst Mode® or pulse-skipping), and comprehensive protection including input/output overvoltage, reverse-current limiting, and thermal shutdown. The ICTRL/IMON interface provides direct analog programming and monitoring of average output current with ±5% accuracy over temperature.
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 bus rails without pre-regulation. |
| Max Output Current | 2.3A continuous - sustained at full load with thermal derating per 5mm × 6mm QFN package θJA = 38°C/W. |
| Min On-Time | 40ns - enables stable 3.3V/5V output from 72V+ inputs at 300kHz+ switching frequencies. |
| Switching Frequency | 200kHz to 2MHz (programmable) - allows optimization of size (higher fSW → smaller inductor) vs. efficiency (lower fSW → lower switching loss). |
| IQ in Regulation | 2µA @ 48VIN/3.3VOUT - enables always-on subsystems in battery-backed equipment with multi-year standby life. |
| Current Sense Accuracy | ±5% average current limit error - ensures precise CC/CV battery charging and LED driver compliance without calibration. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emission limits without added filtering or shielding. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable/Shutdown Control | Holding <1.1V disables regulator; <0.7V reduces IQ to 0.7µA - used for VIN undervoltage lockout or system-level power sequencing. |
| VIN (30,31,32) | Main Power Input | High-side MOSFET drain and VIN-LDO input - accepts up to 105V; multiple pins reduce IR drop and improve thermal spreading. |
| SW (24,25,26) | Power Switch Node | Connection point for external inductor - low-inductance parallel routing minimizes switching node ringing and EMI. |
| EXTVCC (20) | External Bias Input | Enables INTVCC generation from VOUT (3.3V–40V), bypassing VIN-LDO to cut quiescent power dissipation in high-VIN applications. |
| ICTRL (16) | Average Current Setpoint | Analog voltage input (0.4V–1.3V) programs 0–2.5A average output current - enables programmable CC mode for battery charging. |
| IMON (17) | Current Monitor Output | Analog voltage output (0.4V–1.3V) proportional to average output current - provides real-time feedback for system telemetry or safety monitoring. |
| FREQ (11) | Frequency Programming | Resistor-to-SGND sets 200kHz–2MHz fSW; tie to SGND for 300kHz or INTVCC for 1MHz - no external clock required for basic operation. |
| PLLIN/MODE (12) | Synchronization & Light-Load Mode | Accepts external clock for phase alignment; also selects Burst Mode® (float/SGND) or pulse-skipping (100kΩ to INTVCC) at light loads. |
| PGOOD (14) | Power-Good Indicator | Open-drain output asserts low if VFB deviates >10% from regulation - used for downstream power sequencing or fault reporting. |
| SS (15) | Soft-Start & Timeout | Capacitor-to-ground sets output ramp time; internal 11µA current source enables 1.2ms default soft-start - prevents inrush current damage. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI Operation | CISPR25 Class 5 radiated emissions compliance achieved via optimized switching edge rates, integrated boost capacitor, and symmetrical layout-aware pinout - eliminates need for external EMI filters in automotive designs. |
| Integrated Current Sensing | Accurate average output current programming (ICTRL) and monitoring (IMON) without external RSENSE - reduces BOM cost, board space, and thermal drift errors in CC/CV applications. |
| 100% Duty Cycle Capability | Charge-pump-assisted BOOST supply sustains gate drive during continuous conduction - enables dropout-free operation down to VOUT ≈ VIN − 0.5V in hold-up or brownout scenarios. |
| Wide Input Range Support | Single IC handles 4.4V–105V inputs with internal 110V absolute max rating - replaces multiple discrete converters in multi-rail industrial systems (e.g., 12V/24V/48V/72V battery banks). |
| OPTI-LOOP® Compensation | External compensation via ITH pin enables optimized transient response across full load and input range - avoids stability compromises inherent in fixed-compensation solutions. |
| Thermally Enhanced Package | 5mm × 6mm QFN with exposed PGND pad achieves θJA = 38°C/W - supports 2.3A continuous output at +85°C ambient without forced airflow or heatsink. |
Applications
| Battery Charging Systems | Automotive Power Distribution |
|---|---|
|
Use Scenario: Constant-current/constant-voltage charging of 12S Li-ion packs (42V–50.4V) from 48V or 72V vehicle bus. IC Role / Device Role: Primary buck regulator with programmable ICHG and real-time current monitoring for charge termination and thermal management. Use Value: Eliminates external current-sense amplifier and shunt resistor, reducing solution size by 35% and improving accuracy to ±5% over temperature. |
Use Scenario: Powering ADAS ECUs, infotainment head units, and telematics modules from unregulated 12V–72V automotive battery. IC Role / Device Role: High-input-voltage DC/DC converter with CISPR25-compliant EMI and load-dump immunity. Use Value: Meets OEM EMC requirements without ferrite beads or metal shields, cutting validation time and BOM cost. |
| Industrial Motor Drives | Avionics Power Supplies |
|
Use Scenario: Generating 5V/2.3A auxiliary rail for gate drivers, position sensors, and MCU in servo drives powered from 48V/96V DC bus. IC Role / Device Role: Robust, high-efficiency step-down regulator with overvoltage protection and thermal shutdown. Use Value: Sustains full load at +105°C ambient due to low RDS(ON) (265mΩ top / 142mΩ bottom) and thermally optimized QFN package. |
Use Scenario: Converting 28V aircraft bus to 3.3V/5V for flight control computers and inertial measurement units. IC Role / Device Role: MIL-STD-704-compliant power converter with input overvoltage protection and extended temperature operation. Use Value: Guaranteed –40°C to +125°C operation with internal OVLO and UVLO thresholds tightly specified (±25mV) for mission-critical reliability. |
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 |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1.5A max, no integrated current monitor, requires external RSENSE | Lacks ICTRL/IMON interface and 100% duty cycle - unsuitable for CC battery charging or ultra-low-dropout hold-up. | Select LTC7103IUHE#TRPBF when precise current programming, >65V input, or CISPR25 compliance is required. |
| MAX20006AATP/V+T | 3.5V–65V input, 2.5A, integrated current sense but only burst-mode light-load operation | No PLL sync, no programmable frequency, limited to 65V - cannot replace LTC7103 in 72V+ avionics or industrial systems. | Choose LTC7103IUHE#TRPBF for 105V operation, EMI-sensitive environments, or designs requiring pulse-skipping mode flexibility. |
Compared with LM5164QPWPRQ1 and MAX20006AATP/V+T, the LTC7103IUHE#TRPBF uniquely combines 105V input rating, integrated current programming/monitoring, CISPR25 compliance, and 100% duty cycle - making it the only single-chip solution for high-reliability, high-ratio, current-controlled buck conversion in harsh environments.
Availability
LTC7103IUHE#TRPBF is available at Aetrix Electronics and suitable for battery chargers, automotive power distribution units, industrial motor drives, and avionics power supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LTC7103IUHE#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 LTC7103IUHE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC regulators, engineered specifically for demanding applications requiring wide input range, low EMI, and precision current control - such as EV battery management and aerospace power systems.
FAQ
What is the maximum input voltage rating for the LTC7103IUHE#TRPBF?
The LTC7103IUHE#TRPBF has an absolute maximum input voltage rating of 110V, with guaranteed operation from 4.4V to 105V. This allows direct connection to 48V, 72V, and 96V industrial and automotive battery systems without pre-regulation stages. The device includes internal input overvoltage protection triggered at 1.21V on the OVLO pin, which corresponds to ~105V at VIN when configured with standard resistor dividers.
Does the LTC7103IUHE#TRPBF require an external current sense resistor?
No, the LTC7103IUHE#TRPBF does not require an external current sense resistor. It uses internal lossless sensing of top and bottom MOSFET currents combined with RIND-based ramp reconstruction to provide accurate average output current programming (via ICTRL pin) and monitoring (via IMON pin). This eliminates shunt resistor losses, board space, and thermal drift - a key differentiator versus conventional current-mode buck controllers.
Can the LTC7103IUHE#TRPBF operate with 100% duty cycle?
Yes, the LTC7103IUHE#TRPBF supports true 100% duty cycle operation via an internal charge pump that maintains BOOST-to-SW voltage even when the high-side MOSFET remains continuously on. This enables dropout-free regulation down to VOUT ≈ VIN − 0.5V, critical for hold-up during input brownouts in automotive and industrial systems where uninterrupted power is essential.
What is the purpose of the EXTVCC pin on the LTC7103IUHE#TRPBF?
The EXTVCC pin on the LTC7103IUHE#TRPBF powers an internal LDO that generates INTVCC, bypassing the higher-loss VIN-powered LDO when EXTVCC is between 3.1V and 40V. In typical applications, EXTVCC is tied to VOUT, reducing quiescent power dissipation and improving efficiency - especially beneficial in high-VIN, low-IOUT scenarios like always-on automotive modules where IQ drops to 2µA.
How is EMI performance validated for the LTC7103IUHE#TRPBF?
The LTC7103IUHE#TRPBF is validated to meet CISPR25 Class 5 radiated emission limits using standardized automotive test setups (horizontal/vertical polarization, 1m distance). Data sheets include measured plots (Figures G30/G31) showing compliance up to 1GHz without external EMI filters. This is achieved through controlled slew rates, optimized internal gate drivers, symmetrical SW node layout, and integrated bootstrap capacitor - all designed into the silicon and package.
LTC7103IUHE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC7103IUHE#TRPBF FAQ
1.How can I place an order for LTC7103IUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103IUHE#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 LTC7103IUHE#TRPBF reliable?
The price and inventory of LTC7103IUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103IUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7103IUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103IUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103IUHE#TRPBF?
LTC7103IUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103IUHE#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 LTC7103IUHE#TRPBF?
For technical support, including LTC7103IUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103IUHE#TRPBF requirements.
6.How does Aetrix verify that LTC7103IUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7103IUHE#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 LTC7103IUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7103IUHE#TRPBF?
All LTC7103IUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103IUHE#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 LTC7103IUHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7103IUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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