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Analog Devices Inc. LTC7103IUHE#PBF
- Part No.:
- LTC7103IUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103IUHE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
LTC7103IUHE#PBF 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 automotive battery management and industrial power supplies.
For engineers reviewing the LTC7103IUHE#PBF datasheet, LTC7103IUHE#PBF pinout, LTC7103IUHE#PBF application, or LTC7103IUHE#PBF equivalent, key selection criteria include wide-input voltage handling (up to 105V), ultralow EMI compliance (CISPR25 Class 5), programmable fixed-frequency operation (200kHz–2MHz), and accurate average current limit setting via ICTRL pin.
Technical Context
The LTC7103IUHE#PBF implements constant-frequency average current mode control using internal reconstruction of inductor current - eliminating need for external RSENSE while supporting fast transient response and stable operation at very low duty cycles. Its dual LDO architecture (VIN- and EXTVCC-powered INTVCC) enables high-efficiency bootstrapped operation across wide input ranges.
It integrates a PLL-synchronizable oscillator, OPTI-LOOP® or fixed internal compensation, brick-wall current limiting, and comprehensive protection including input/output overvoltage, thermal shutdown, and reverse-current prevention. The device supports both Burst Mode® and pulse-skipping light-load operation with selectable behavior via PLLIN/MODE pin.
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 - sufficient for powering FPGAs, DSPs, or multi-rail subsystems from single high-vin source. |
| Switching Frequency | 200kHz to 2MHz, programmable via resistor or PLL sync - enables optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering. |
| Min On-Time | 40ns - allows stable 48V→3.3V (14.5:1) or 72V→5V (14.4:1) conversion at 1MHz without pulse skipping. |
| IQ in Regulation | 2µA at 48VIN/3.3VOUT - enables always-on monitoring circuits in battery-backed systems with minimal standby drain. |
| Current Sensing | No external RSENSE required - average output current programmed via ICTRL voltage (0.4V–1.3V = 0A–2.5A) and monitored on IMON pin. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emission limits without added shielding or snubbers. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 38°C/W; exposed pad must be soldered to PCB ground plane for full electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable control input | 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 | Connects to high-side MOSFET drain and powers internal VIN LDO - requires local ceramic decoupling to PGND for stability and EMI suppression. |
| SW (24,25,26) | Power switch node | Drives external inductor; connects to BOOST capacitor - high di/dt node requiring tight layout and Kelvin routing to minimize ringing. |
| ICTRL (16) | Average current setpoint | 0.4V–1.3V input sets 0A–2.5A average output current - enables CC/CV battery charging or precision current sourcing without sense resistor. |
| IMON (17) | Current monitor output | 0.4V–1.3V analog voltage proportional to average output current - provides real-time feedback for telemetry or closed-loop current regulation. |
| FREQ (11) | Frequency programming | Resistor-to-SGND sets fSW from 200kHz to 2MHz - higher frequencies reduce inductor size but increase switching losses. |
| PLLIN/MODE (12) | Synchronization & light-load mode | Accepts external clock for phase alignment; tied to SGND for Burst Mode®, to INTVCC via 100kΩ for pulse-skipping - critical for noise-sensitive systems. |
| EXTVCC (20) | External bias supply | Accepts 3.3V–40V to power INTVCC LDO - bypasses VIN LDO, reducing dissipation and improving efficiency in high-VIN applications. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI design | CISPR25 Class 5 radiated emissions compliance achieved via optimized gate drive, spread-spectrum-capable oscillator, and integrated slew-rate control - eliminates need for external EMI filters in automotive designs. |
| 100% duty cycle operation | Enabled by internal charge pump maintaining BOOST-SW voltage during extended high-side conduction - supports dropout-limited operation down to VOUT ≈ VIN – 0.3V. |
| Accurate current programming | ±3% average current limit accuracy over temperature and line - enables reliable constant-current battery charging and LED driver applications without calibration. |
| Programmable light-load mode | Selectable Burst Mode® (low ripple) or pulse-skipping (fast transient) via PLLIN/MODE pin - balances efficiency vs. output voltage stability based on load profile. |
| Integrated protection suite | Includes input/output overvoltage lockout (OVLO/PGOOD), thermal shutdown, reverse-current prevention, and brick-wall current limiting - reduces BOM count and improves system reliability. |
Applications
| Battery Management Systems | Automotive ADAS Power Rails |
|---|---|
|
Use Scenario: Regulating 48V or 72V vehicle battery to 3.3V/5V/12V for radar, camera, and domain controller modules. IC Role / Device Role / Timing Role: Primary high-vin buck converter providing isolated, low-noise, and EMI-compliant power with precise current limiting for fault containment. Use Value: Eliminates need for intermediate 12V bus; supports direct 48V–3.3V conversion at 2.3A with <2µA quiescent current - extends battery runtime in parked ADAS systems. |
Use Scenario: Powering FPGA-based sensor fusion units requiring stable 1.2V core and 1.8V I/O rails from 12V/24V vehicle supply. IC Role / Device Role / Timing Role: High-efficiency, synchronized buck regulator supplying multiple downstream point-of-load converters via CLKOUT signal. Use Value: PLL synchronization ensures deterministic switching timing across multiple regulators - reduces beat-frequency noise and simplifies EMI filter design. |
| Industrial Motor Drives | Avionics Power Conditioning |
|
Use Scenario: Generating isolated 5V/2.3A auxiliary supply for gate drivers, encoders, and communication interfaces in variable-frequency drives. IC Role / Device Role / Timing Role: Robust, high-vin buck converter with input overvoltage protection and thermal derating for harsh factory environments. Use Value: 105V absolute max input rating and –40°C to +125°C operation allow direct connection to unregulated 72V DC bus - avoids pre-regulator stage and improves system efficiency. |
Use Scenario: Providing regulated 28V-to-5V conversion for flight control computers and inertial measurement units in MIL-STD-704 aircraft power systems. IC Role / Device Role / Timing Role: Radiation-tolerant (MP-grade variant available), high-reliability buck regulator with input surge immunity and latch-off protection. Use Value: Input UVLO/ovlo thresholds and 110V abs max rating meet MIL-STD-704 transient requirements; EXTVCC option enables efficient operation during brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | 4–60V input, 8A output, no integrated MOSFETs - requires external high-side/low-side FETs; lacks IMON/ICTRL current programming. | Used where higher current (>2.3A) or discrete FET selection is needed; not suitable for space-constrained layouts requiring monolithic integration. | Choose LTC3891 when output current >2.3A is required and board area allows external FETs; avoid if current monitoring or compact footprint is critical. |
| MAX20008AATP/V+T | 3.5–65V input, 2.5A output, integrated FETs; lower max input (65V vs. 105V); no EXTVCC pin or PLL sync; only 1.2V–5.5V fixed outputs. | Targeted at infotainment and body electronics; insufficient for 72V+ industrial or military inputs; limited output flexibility. | Choose MAX20008A for cost-sensitive 12V/24V automotive apps needing AEC-Q100 grade; avoid for >65V input or programmable current control. |
Compared with LTC3891EFE#PBF and MAX20008AATP/V+T, the LTC7103IUHE#PBF uniquely combines 105V input tolerance, monolithic 2.3A integration, accurate current programming/monitoring, and CISPR25-compliant EMI performance - making it optimal for compact, high-reliability 48V–72V systems demanding precise current control and low standby power.
Availability
LTC7103IUHE#PBF is available at Aetrix Electronics and suitable for automotive ADAS power rails, industrial motor drive auxiliaries, avionics power conditioning, and battery management systems requiring stable component supply across extended temperature and high-vin operating conditions.
Supply support for LTC7103IUHE#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets with precision power, sensing, and signal chain solutions.
The LTC7103IUHE#PBF belongs to Analog Devices' Power by Linear™ family of high-vin monolithic DC/DC regulators, designed specifically for robust, low-EMI power conversion in automotive, industrial, and military systems where wide input range and reliability are critical.
FAQ
What is the maximum input voltage rating for the LTC7103IUHE#PBF?
The LTC7103IUHE#PBF has an absolute maximum input voltage rating of 110V, with guaranteed operation from 4.4V to 105V. This allows direct interface with 48V, 72V, and 96V battery systems without pre-regulation - a key advantage over 60V-class alternatives. Operation beyond 105V is not specified and may compromise reliability or safety margins.
Does the LTC7103IUHE#PBF require an external current sense resistor?
No, the LTC7103IUHE#PBF does not require an external current sense resistor. It uses internal lossless sensing of top and bottom MOSFET currents combined with reconstructed inductor current ramp to enable accurate average current programming via the ICTRL pin and monitoring via the IMON pin - reducing component count and PCB area while maintaining ±3% current limit accuracy.
How is EMI performance validated for the LTC7103IUHE#PBF?
The LTC7103IUHE#PBF is validated to meet CISPR25 Class 5 radiated emission limits in standard test configurations (e.g., 48VIN→5VOUT, 2A, 400kHz). Test data shows peak emissions below Class 5 limits across 30–1000MHz in both horizontal and vertical polarizations - confirming suitability for automotive front-end power without additional EMI filtering components.
Can the LTC7103IUHE#PBF operate with 100% duty cycle?
Yes, the LTC7103IUHE#PBF supports true 100% duty cycle operation via an internal charge pump that maintains BOOST-SW voltage during extended high-side conduction. This enables dropout-limited operation down to VOUT ≈ VIN – 0.3V - critical for maintaining regulation during cold-crank or brownout events in automotive applications.
What is the purpose of the EXTVCC pin on the LTC7103IUHE#PBF?
The EXTVCC pin on the LTC7103IUHE#PBF accepts an external 3.3V–40V supply to power the INTVCC LDO, bypassing the internal VIN LDO. This reduces power dissipation and improves efficiency in high-VIN applications (e.g., 72V→5V), especially when the output voltage is within the EXTVCC operating range - a key enabler for thermally constrained designs.
LTC7103IUHE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-WFQFN, 26 Leads, Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7103IUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103IUHE#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 LTC7103IUHE#PBF reliable?
The price and inventory of LTC7103IUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103IUHE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7103IUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103IUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103IUHE#PBF?
LTC7103IUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103IUHE#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 LTC7103IUHE#PBF?
For technical support, including LTC7103IUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103IUHE#PBF requirements.
6.How does Aetrix verify that LTC7103IUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7103IUHE#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 LTC7103IUHE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7103IUHE#PBF?
All LTC7103IUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103IUHE#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 LTC7103IUHE#PBF part is unused and in its original packaging.
Return procedure for LTC7103IUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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