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Analog Devices Inc. LTC7103RUHE-1#PBF
- Part No.:
- LTC7103RUHE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103RUHE-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,179
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Product details
Overview
LTC7103RUHE-1#PBF from Analog Devices is a 105V, 2.3A monolithic synchronous step-down DC/DC regulator with average current mode control, operating from 4.4V to 105V input and delivering adjustable 1V–VIN output. It features 40ns minimum on-time, 100% duty cycle capability, and integrated current programming/monitoring without external sense resistors - enabling high-ratio conversion in automotive battery management and industrial power supplies.
For engineers reviewing the LTC7103RUHE-1#PBF datasheet, LTC7103RUHE-1#PBF pinout, LTC7103RUHE-1#PBF application, or LTC7103RUHE-1#PBF equivalent, key selection criteria include its CISPR 25-compliant low-EMI operation, programmable 200kHz–2MHz switching frequency, continuous inductor current mode support, and AEC-Q100 qualification in process for harsh-environment deployment.
Technical Context
The LTC7103RUHE-1#PBF implements constant-frequency average current mode control using internal top/bottom MOSFET current sensing and lossless inductor current reconstruction via RIND-based ramp generation. Its dual-loop architecture separates fast average current regulation (via ICTRL/IMON) from voltage loop compensation (via ITH or OPTI-LOOP®), enabling precise CC/CV control without external sense components.
It integrates two LDOs: a VIN-powered 3.5V INTVCC regulator and an EXTVCC-powered bypass LDO (3.1V–40V input), supporting bootstrapped efficiency optimization. The device supports three light-load modes (Burst Mode®, pulse-skipping, forced continuous), PLL synchronization, and input/output overvoltage protection - all within a thermally enhanced 5mm × 6mm QFN package with exposed PGND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 96V battery systems without pre-regulation |
| Max Output Current | 2.3A continuous - sustained at full load with thermal derating per θJA = 38°C/W in 5mm × 6mm QFN |
| Min On-Time | 40ns - enables stable 3.3V output from 100V input at 300kHz (3.3% duty cycle) |
| Quiescent Current | 2µA at 48VIN→3.3VOUT - extends battery life in always-on automotive modules |
| Switching Frequency | 200kHz to 2MHz - programmable via FREQ pin resistor; supports EMI filtering and layout optimization |
| Current Sensing | No external RSENSE required - accurate average current programming/monitoring via ICTRL/IMON pins |
| Protection Features | Input/output OVP, thermal shutdown, brick-wall current limit, reverse-current prevention - enhances system reliability |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37), rated for –40°C to +150°C junction temperature. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable control input | Holding <1.1V disables regulator; <0.7V reduces IQ to 0.7µA - enables precise undervoltage lockout via resistor divider |
| VIN (30,31,32) | Main power input | Supplies high-side MOSFET drain and powers INTVCC LDO - requires local ceramic decoupling to PGND |
| SW (24,25,26) | Power switch node | Connects internal top/bottom MOSFETs to external inductor - critical high-dI/dt path requiring tight layout |
| BOOST (27) | High-side gate drive supply | Bootstrapped rail generated via 0.1µF BST capacitor between BOOST and SW - enables 100% duty cycle operation |
| ICTRL (16) | Average current setpoint | 0.4V–1.3V input programs 0–2.5A average output current - internal 20µA pull-up enables single-resistor programming |
| IMON (17) | Current monitor output | 0.4V–1.3V analog voltage proportional to average output current - used for telemetry or closed-loop CC control |
| FREQ (11) | Switching frequency control | Sources 40µA; resistor to SGND sets 200kHz–2MHz - low capacitance required for Burst Mode stability |
| PLLIN/MODE (12) | Sync clock input / light-load mode select | Accepts external clock for phase alignment; tied to INTVCC/SGND/FLOAT to select forced continuous/pulse-skip/Burst Mode |
| PGND/Exposed Pad (35,36,37) | Power ground return | Primary thermal path and low-impedance return for high-current switches - must be solidly connected to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI/EMC emissions | CISPR 25 Class 5 compliant radiated emissions - reduces need for external EMI filters in automotive designs |
| PassThru™ 100% duty cycle | Maintains regulation during input brownout down to VOUT - eliminates dropout in battery-fed systems |
| Fast current programming | ICTRL pin sets average output current from 0A to 2.5A with ±3% accuracy - enables precision CC/CV battery charging |
| OPTI-LOOP® compensation | Automatic voltage-loop compensation adjustment based on fSW - simplifies design across 200kHz–2MHz range |
| EXTVCC LDO bypass | Derives INTVCC from VOUT (3.3V–40V), reducing VIN LDO losses - improves efficiency by up to 3% at high VIN |
| AEC-Q100 qualification | In process for Grade 1 (–40°C to +125°C ambient) - supports functional safety requirements in automotive ECUs |
Applications
| Battery Chargers and CC/CV Supplies | Automotive and Military Systems |
|---|---|
|
Use Scenario: 48V lithium-ion battery charger with constant-current/constant-voltage profile and input surge tolerance up to 100V. IC Role / Device Role / Timing Role: Primary buck controller providing regulated output while dynamically programming charge current via ICTRL and monitoring via IMON. Use Value: Eliminates external current-sense resistor and amplifier, reducing BOM cost and board area while maintaining ±3% current accuracy across temperature. |
Use Scenario: Power supply for ADAS camera module requiring 5V/2A from vehicle 12V–72V battery with low EMI and extended cold-crank operation. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with PassThru™ mode maintaining 5V output during 4.5V battery dips. Use Value: 40ns min on-time enables stable 5V output even at 72V input (6.9% duty cycle), avoiding need for cascaded converters. |
| Industrial, Avionics and Heavy Equipment | Medical Instruments and Telecommunication |
|
Use Scenario: 24V/48V distributed power rail in railway signaling cabinet exposed to 105V transients per EN 50155. IC Role / Device Role / Timing Role: Primary DC/DC converter with input OVP (OVLO pin) and thermal shutdown protecting downstream FPGA and ADCs. Use Value: 110V absolute max VIN rating and robust protection suite ensure reliable operation during lightning-induced surges. |
Use Scenario: Point-of-load regulator for ultrasound imaging front-end requiring ultra-low noise 3.3V supply with fast transient response. IC Role / Device Role / Timing Role: Synchronous buck delivering 2.3A with Burst Mode® for low-noise standby and forced continuous for imaging bursts. Use Value: 2µA quiescent current extends battery runtime in portable devices; selectable light-load modes optimize efficiency vs. noise trade-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7103RUHE#PBF | Lacks continuous inductor current mode; only supports Burst Mode® and pulse-skipping at light loads | Not suitable for applications requiring continuous conduction mode (CCM) under all load conditions | Select when CCM operation is unnecessary and pin compatibility with LTC7103-1 is not required |
| LM5164QPWPRQ1 | 65V max VIN, 1.5A output, no integrated current monitoring - requires external RSENSE for CC control | Lower voltage/current rating; lacks ICTRL/IMON interface and CISPR 25 compliance | Choose for cost-sensitive 48V automotive applications where 105V tolerance and precision current control are not needed |
Compared with LTC7103RUHE#PBF and LM5164QPWPRQ1, the LTC7103RUHE-1#PBF uniquely delivers 105V operation with integrated current programming, CISPR 25 compliance, and guaranteed continuous inductor current mode - making it the only option for high-reliability, high-ratio CC/CV power in automotive and industrial environments.
Availability
LTC7103RUHE-1#PBF is available at Aetrix Electronics and suitable for battery chargers, automotive ADAS power supplies, industrial 48V/72V distribution systems, and medical imaging equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC7103RUHE-1#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 healthcare markets.
The LTC7103-1 product line delivers high-voltage, high-efficiency synchronous buck regulators with integrated current control for demanding applications including battery management, avionics, and heavy equipment power systems.
FAQ
What is the maximum input voltage rating for the LTC7103RUHE-1#PBF?
The LTC7103RUHE-1#PBF has an absolute maximum input voltage rating of 110V, with specified operation from 4.4V to 105V. This allows direct connection to 96V battery systems and tolerance of transient surges common in automotive and industrial environments. Operation beyond 105V is not guaranteed and may trigger internal protection circuits.
Does the LTC7103RUHE-1#PBF require an external current sense resistor?
No, the LTC7103RUHE-1#PBF does not require an external current sense resistor. It implements lossless average current sensing using internal MOSFET RDS(ON) monitoring and inductor current reconstruction. Current programming is achieved via the ICTRL pin (0.4V–1.3V), and monitoring via the IMON pin (0.4V–1.3V), both with ±3% accuracy over temperature.
How does the LTC7103RUHE-1#PBF achieve 100% duty cycle operation?
The LTC7103RUHE-1#PBF achieves 100% duty cycle operation through an internal charge pump that maintains BOOST-to-SW voltage during extended high-side MOSFET conduction. This enables PassThru™ mode, allowing VOUT to track VIN down to VOUT level - critical for maintaining regulation during cold-crank events in automotive systems.
What light-load efficiency modes does the LTC7103RUHE-1#PBF support?
The LTC7103RUHE-1#PBF supports three selectable light-load modes: Burst Mode® (lowest IQ, ~2µA), pulse-skipping (reduced ripple), and forced continuous conduction mode (best transient response). Mode selection is controlled via the PLLIN/MODE pin - tied to SGND (Burst), INTVCC (forced CCM), or pulled to INTVCC via 100kΩ (pulse-skipping).
Is the LTC7103RUHE-1#PBF qualified for automotive applications?
Yes, the LTC7103RUHE-1#PBF is undergoing AEC-Q100 qualification (Grade 1, –40°C to +125°C ambient) and features built-in protections essential for automotive use: input/output overvoltage protection, thermal shutdown, and robust 110V absolute maximum ratings. Its CISPR 25 Class 5 compliance further validates suitability for ECU and ADAS power designs.
LTC7103RUHE-1#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:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC7103RUHE-1#PBF FAQ
1.How can I place an order for LTC7103RUHE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103RUHE-1#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 LTC7103RUHE-1#PBF reliable?
The price and inventory of LTC7103RUHE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103RUHE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC7103RUHE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103RUHE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103RUHE-1#PBF?
LTC7103RUHE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103RUHE-1#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 LTC7103RUHE-1#PBF?
For technical support, including LTC7103RUHE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103RUHE-1#PBF requirements.
6.How does Aetrix verify that LTC7103RUHE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7103RUHE-1#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 LTC7103RUHE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC7103RUHE-1#PBF?
All LTC7103RUHE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103RUHE-1#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 LTC7103RUHE-1#PBF part is unused and in its original packaging.
Return procedure for LTC7103RUHE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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