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Analog Devices Inc. LTC7103HUHE#PBF
- Part No.:
- LTC7103HUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103HUHE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
LTC7103HUHE#PBF from Analog Devices is a 105V, 2.3A monolithic synchronous step-down DC/DC regulator with average current mode control. It operates from 4.4V to 105V input, delivers adjustable 1V–VIN output, achieves 40ns minimum on-time and 100% duty cycle, and targets high-reliability industrial and automotive power rails requiring ultralow EMI and wide VIN operation.
For engineers reviewing the LTC7103HUHE#PBF datasheet, LTC7103HUHE#PBF pinout, LTC7103HUHE#PBF application, or LTC7103HUHE#PBF equivalent, key selection criteria include its 150°C junction-rated QFN package, CISPR25-compliant radiated emissions, no external RSENSE current monitoring, programmable 200kHz–2MHz switching frequency, and brick-wall current limit with ICTRL voltage programming.
Technical Context
The LTC7103HUHE#PBF implements constant-frequency average current mode control using internal top/bottom MOSFET current sensing and lossless inductor current reconstruction-enabling precise CC/CV regulation without external sense resistors. Its architecture supports both pulse-skipping and Burst Mode® light-load operation, with OPTI-LOOP® or fixed internal compensation selectable via the ITH pin.
It integrates dual LDOs (VIN- and EXTVCC-powered INTVCC), PLL synchronization (200kHz–2MHz), eight pin-selectable fixed outputs (1.2V–15V), and comprehensive protection including input/output overvoltage, thermal shutdown, and reverse-current limiting. The 36-lead 5mm × 6mm QFN exposes PGND on the thermal pad for enhanced thermal performance at TJ = –40°C to 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 96V industrial/military bus systems without pre-regulation. |
| Output Current | Up to 2.3A continuous - enables single-chip 5V/2.3A or 12V/1.8A conversion from high-VIN sources. |
| Switching Frequency | 200kHz to 2MHz - programmable via resistor on FREQ pin; allows optimization of size (high-f) vs. efficiency (low-f). |
| Min On-Time | 40ns - enables stable operation at extreme step-down ratios (e.g., 72V→3.3V @ 300kHz, D ≈ 4.6%). |
| Quiescent Current | 2µA @ 48VIN→3.3VOUT - extends battery life in always-on systems such as telematics and remote sensors. |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated emission limits without added filtering. |
| Junction Temp Range | –40°C to 150°C - qualified for under-hood automotive, avionics, and heavy-equipment applications. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37). Thermal resistance 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 VIN-based UVLO with resistor divider. |
| VIN (30,31,32) | Main Power Input | Accepts 4.4V–105V; powers high-side MOSFET and internal VIN LDO generating INTVCC (3.5V). |
| SW (24,25,26) | Power Switch Node | Connects internal top/bottom MOSFETs to external inductor; requires low-ESR ceramic bootstrap capacitor (0.1µF) to BOOST. |
| ICTRL (16) | Average Output Current Setpoint | 0.4V–1.3V input programs 0A–2.5A average current limit - enables CC/CV battery charging without external sense resistor. |
| IMON (17) | Current Monitor Output | 0.4V–1.3V analog voltage proportional to average output current (0A–2.5A) - provides real-time load telemetry. |
| FREQ (11) | Switching Frequency Control | Sources 40µA; resistor to SGND sets fSW from 200kHz to 2MHz - determines inductor size and EMI profile. |
| 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 (100k to INTVCC). |
| PGOOD (14) | Open-Drain Power-Good Flag | Asserts low when VFB deviates >±10% from target - signals system controller that output is regulated and stable. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI Operation | CISPR25 Class 5 radiated emission compliance achieved via Silent Switcher®-inspired layout, integrated boost capacitor, and controlled edge rates - eliminates need for external EMI filters in automotive designs. |
| No External Current Sense Resistor | Accurate average current programming and monitoring via ICTRL/IMON pins - removes power loss, board space, and calibration burden of shunt-based sensing. |
| 100% Duty Cycle Capability | Internal charge pump maintains BOOST-SW voltage during continuous conduction - enables dropout operation down to VOUT = VIN − 0.3V at light loads. |
| Wide Output Voltage Range | 1V to VIN with eight pin-selectable fixed options (1.2V–15V) - supports diverse rail requirements from core logic to analog supplies without external feedback dividers. |
| Thermally Enhanced Package | 5mm × 6mm QFN with exposed PGND pad and θJA = 38°C/W - sustains 2.3A output at TJ ≤ 150°C in compact layouts with minimal copper area. |
Applications
| Battery Charging Systems | Automotive ADAS Power Rails |
|---|---|
|
Use Scenario: Constant-current/constant-voltage charging of 12V–48V LiFePO₄ or lead-acid battery banks in off-grid solar or vehicle auxiliary systems. IC Role / Device Role / Timing Role: Primary buck regulator providing programmable CC/CV output with real-time current telemetry via IMON pin. Use Value: Eliminates external current-sense resistor and amplifier, reducing BOM cost and thermal footprint while maintaining ±1.5% current accuracy across temperature. |
Use Scenario: Powering radar, camera, and domain controller modules in vehicles where input may swing from 5V (cold crank) to 105V (load dump). IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering stable 3.3V/5V/12V rails with CISPR25-compliant EMI behavior. Use Value: Meets OEM EMC requirements without ferrite beads or shielded inductors, simplifying layout and accelerating automotive qualification. |
| Industrial Motor Drives | Avionics Power Conversion |
|
Use Scenario: Generating isolated gate-driver supplies and logic rails from unregulated 24V–72V DC bus in servo drives and PLCs. IC Role / Device Role / Timing Role: Synchronous buck regulator with fast transient response and robust overvoltage protection on VIN and VOUT. Use Value: Withstands 110V abs max input and includes OVLO shutdown, enabling reliable operation in noisy factory environments with voltage transients. |
Use Scenario: Converting 28V aircraft bus to 5V/15V supplies for flight control computers and inertial measurement units. IC Role / Device Role / Timing Role: High-reliability DC/DC converter operating up to 150°C junction temperature with full MIL-STD-883 traceability. Use Value: H-grade qualification (–40°C to 150°C) and thermally optimized QFN package ensure long-term stability in sealed, convection-limited avionics enclosures. |
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, 10A peak, no integrated MOSFETs; requires external high-side/low-side FETs and current sense resistor. | Targeted at higher-current (>5A), lower-VIN industrial SMPS where discrete FET selection is preferred. | Select when >3A output or custom FET optimization is required; not drop-in due to external power stage and sensing. |
| MAX20006ATPA/VY+ | 3.5–65V input, 2.5A, integrated FETs, but lacks ICTRL/IMON current programming/monitoring and has only 125°C max TJ. | Suitable for cost-sensitive automotive body electronics where 125°C rating suffices and current telemetry is unnecessary. | Choose for simpler, lower-cost 12V/24V systems lacking CC/CV or high-temp requirements; no pin compatibility. |
Compared with LTC3891EFE#PBF and MAX20006ATPA/VY+, the LTC7103HUHE#PBF uniquely combines 105V capability, integrated current sensing/programming, 150°C operation, and CISPR25 compliance in a single monolithic package - making it optimal for space-constrained, high-reliability, high-VIN applications demanding precision current control.
Availability
LTC7103HUHE#PBF is available at Aetrix Electronics and suitable for battery chargers, automotive ADAS subsystems, and industrial motor drive power supplies requiring stable component supply, extended temperature support, and EMI-compliant design.
Supply support for LTC7103HUHE#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 belongs to Analog Devices' Power by Linear™ family of high-voltage monolithic DC/DC regulators, designed specifically for ruggedized power conversion in automotive, avionics, and industrial equipment where wide input range, reliability, and low EMI are critical.
FAQ
What is the maximum input voltage rating for the LTC7103HUHE#PBF?
The LTC7103HUHE#PBF has an absolute maximum input voltage rating of 110V, with guaranteed operation from 4.4V to 105V. This makes it suitable for direct connection to 48V, 72V, and 96V industrial and transportation power buses, including automotive load-dump scenarios up to 105V.
Does the LTC7103HUHE#PBF require an external current sense resistor?
No, the LTC7103HUHE#PBF does not require an external current sense resistor. It uses internal MOSFET current sensing and inductor current reconstruction to enable accurate average current programming (via ICTRL pin) and monitoring (via IMON pin), eliminating power loss and board space associated with shunt resistors.
How is the switching frequency set on the LTC7103HUHE#PBF?
The switching frequency of the LTC7103HUHE#PBF is set using the FREQ pin: connect to SGND for 300kHz, to INTVCC for 1MHz, or use a resistor to SGND to program 200kHz–2MHz. The pin sources 40µA, so RFREQ = (VINTVCC − 0.7V) / 40µA yields the target frequency per the datasheet's RFREQ vs. fSW curve.
What is the purpose of the EXTVCC pin on the LTC7103HUHE#PBF?
The EXTVCC pin on the LTC7103HUHE#PBF powers an internal LDO that generates INTVCC (3.5V), bypassing the VIN-powered LDO when EXTVCC is between 3.1V and 40V. This improves efficiency by reducing power dissipation in the VIN LDO - especially beneficial when VOUT is ≥3.3V and can directly supply EXTVCC.
Can the LTC7103HUHE#PBF operate at 100% duty cycle?
Yes, the LTC7103HUHE#PBF supports true 100% duty cycle operation using an internal charge pump that maintains BOOST-SW voltage even when the top MOSFET is continuously on. This enables ultra-low dropout regulation - e.g., delivering 11.7V from a 12V input - critical for brownout resilience.
LTC7103HUHE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC7103HUHE#PBF FAQ
1.How can I place an order for LTC7103HUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103HUHE#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 LTC7103HUHE#PBF reliable?
The price and inventory of LTC7103HUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103HUHE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7103HUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103HUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103HUHE#PBF?
LTC7103HUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103HUHE#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 LTC7103HUHE#PBF?
For technical support, including LTC7103HUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103HUHE#PBF requirements.
6.How does Aetrix verify that LTC7103HUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7103HUHE#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 LTC7103HUHE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7103HUHE#PBF?
All LTC7103HUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103HUHE#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 LTC7103HUHE#PBF part is unused and in its original packaging.
Return procedure for LTC7103HUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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