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Analog Devices Inc. LT7101HUHE#TRPBF
- Part No.:
- LT7101HUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LT7101HUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
LT7101HUHE#TRPBF from Analog Devices is a 105V, 1A 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 35ns minimum on-time, 2µA quiescent current at 48VIN/3.3VOUT, and integrated current programming/monitoring without external RSENSE. Used in high-reliability automotive and industrial power supplies requiring wide VIN and low EMI.
For engineers reviewing the LT7101HUHE#TRPBF datasheet, LT7101HUHE#TRPBF pinout, LT7101HUHE#TRPBF application, or LT7101HUHE#TRPBF equivalent, key selection criteria include its 100% duty cycle capability, CISPR 25-compliant radiated EMI performance, programmable 200kHz–2MHz switching frequency, and H-grade (–40°C to 150°C) operation for under-hood and avionics use cases.
Technical Context
The LT7101HUHE#TRPBF implements constant-frequency average current mode control using internal reconstruction of inductor current via top/bottom switch sensing-eliminating external sense resistors. Its architecture supports fast current-loop response with OPTI-LOOP® or fixed internal compensation and enables stable regulation at ultra-high step-down ratios via 35ns minimum on-time and programmable ramp generation via RIND.
It integrates dual LDOs: a VIN-powered 3.5V INTVCC regulator and an EXTVCC-powered bypass LDO (3.1V–40V input), reducing power loss at high input voltages. Protection includes input/output overvoltage, thermal shutdown, brick-wall current limiting, and reverse-current detection with mode-selectable thresholds (0A in Burst Mode, 0.4A in forced continuous).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 96V industrial/bus systems without pre-regulation |
| Output Current | Up to 1A - delivers full rated load across full temperature range (–40°C to 150°C junction) |
| Quiescent Current | 2µA at 48VIN/3.3VOUT - enables always-on operation in battery-backed systems with multi-year standby life |
| Switching Frequency | 200kHz to 2MHz - selectable via resistor or external clock; allows optimization of size (high fSW) vs. efficiency (low fSW) |
| Min. On-Time | 35ns - enables stable 3.3V output from 100V input at 300kHz (3.3% duty cycle) without pulse-skipping instability |
| EMI Performance | CISPR 25 Class 5 compliant - meets stringent automotive radiated emission limits without added filtering |
| Current Sensing | No external RSENSE required - accurate average current programming and monitoring via ICTRL/IMON pins |
Pinout & Package
LT7101HUHE#TRPBF is housed in a thermally enhanced 36-lead (5mm × 6mm) plastic QFN package with exposed PGND pad (Pin 37), rated for 150°C maximum junction temperature. The package supports high-power dissipation with θJA = 38°C/W and θJC = 5°C/W when properly soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable/UVLO control | Holding <1.1V disables regulator; <0.7V reduces IQ to ~0.7µA; resistor divider enables precise input UVLO threshold |
| VIN (30,31,32) | Main power input | Connects to high-voltage source (up to 105V); multiple pins reduce IR drop and improve thermal path |
| SW (24,25,26) | Power switch node | Drives external inductor; paralleled pins handle high peak currents and reduce trace inductance |
| PGND/Exposed Pad (35,36,37) | Power ground return | Must be soldered to PCB ground plane for thermal management and low-noise current return path |
| ICTRL (16) | Average current setpoint | 0.4V–1.3V input programs 0A–1.11A 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 (1.21V/A scale) |
| FREQ (11) | Frequency control | Sources 40µA; resistor to SGND sets fSW from 200kHz–2MHz; tie to SGND/INTVCC for 300kHz/1MHz presets |
| PLLIN/MODE (12) | Synchronization & light-load mode | Accepts external clock for phase alignment; also selects Burst Mode (float/SGND), pulse-skipping (100k to INTVCC), or forced continuous (INTVCC) |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI/EMC emissions | CISPR 25 Class 5 compliance achieved via Silent Switcher®-inspired layout, controlled slew rates, and integrated boost capacitor |
| Fast current programming & monitoring | Direct ICTRL-to-current and IMON-to-current mapping eliminates external sense resistor and amplifier, saving board space and BOM cost |
| 100% duty cycle operation | Charge pump maintains BOOST-SW voltage during extended high-side conduction, enabling dropout-free operation near VOUT |
| Wide output voltage range | 1V to VIN programmable via VFB divider or eight pin-selectable fixed outputs (1.2V–15V) using VPRG1/VPRG2 |
| Thermally robust H-grade rating | Guaranteed operation from –40°C to 150°C junction temperature - qualified for under-hood automotive and harsh-environment industrial use |
Applications
| Battery Chargers and CC/CV Supplies | Automotive and Military Systems |
|---|---|
Use Scenario: Constant-current/constant-voltage charging of 12S Li-ion packs (up to 50.4V) from 48V vehicle bus. IC Role / Device Role / Timing Role: Primary buck controller regulating output voltage and precisely programming charge current via ICTRL pin. Use Value: Eliminates external current-sense resistor and amplifier, reducing thermal drift errors and improving charge accuracy to ±1.2% over temperature. | Use Scenario: Powering radar front-end modules and engine control units in diesel-electric hybrid vehicles. IC Role / Device Role / Timing Role: High-input-voltage DC/DC converter supplying 3.3V/5V rails from 24V/48V battery with EMI immunity for safety-critical subsystems. Use Value: CISPR 25 compliance ensures no interference with RF receivers; 150°C rating supports placement near hot engine compartments. |
| Industrial, Avionics and Heavy Equipment | Medical Instruments and Telecommunication Systems |
Use Scenario: Powering isolated gate drivers and sensors in 72V DC traction inverters for electric forklifts. IC Role / Device Role / Timing Role: Wide-VIN buck regulator delivering 12V/1A with fast transient response to motor startup surges. Use Value: 35ns min-on-time enables stable 12V output from 72V input at 500kHz, minimizing inductor size while maintaining regulation during line dips. | Use Scenario: Generating clean 5V/1A supply for FPGA-based signal processing boards in portable ultrasound devices. IC Role / Device Role / Timing Role: Low-noise, low-IQ buck regulator powering digital core logic with burst-mode operation during idle periods. Use Value: 2µA quiescent current extends battery runtime; integrated EXTVCC LDO improves efficiency by >15% vs. VIN-fed bias at 48V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3310S | Lower max input (6V), higher max output current (10A), 5V–6V optimized; no 105V rating or H-grade temp support | Targeted at low-VIN, high-current point-of-load; unsuitable for 48V+ industrial or automotive inputs | Select LTC3310S only for sub-6V input systems requiring >1A output; LT7101HUHE#TRPBF remains sole choice for 105V/H-grade requirement |
| LM5164QPWPRQ1 | 65V max input, AEC-Q100 qualified, 1A output, but lacks integrated current monitoring and 35ns min-on-time | Automotive-qualified but limited to 65V; cannot replace LT7101HUHE#TRPBF in 72V+ or precision current-programming applications | Choose LM5164QPWPRQ1 for cost-sensitive AEC-Q100 designs below 65V; LT7101HUHE#TRPBF is required where 105V, current monitoring, or 150°C operation is mandatory |
Compared with LTC3310S and LM5164QPWPRQ1, the LT7101HUHE#TRPBF uniquely combines 105V input, H-grade temperature range, integrated current programming/monitoring, and CISPR 25 compliance-making it irreplaceable in high-reliability, wide-VIN industrial and automotive power designs.
Availability
LT7101HUHE#TRPBF is available at Aetrix Electronics and suitable for battery chargers, automotive ECUs, industrial motor drives, and medical imaging equipment requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LT7101HUHE#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 LT7101 product line delivers high-voltage, high-efficiency synchronous buck regulators with integrated current sensing and EMI-optimized design-targeted at demanding applications including electric vehicle subsystems, avionics power, and ruggedized industrial controls.
FAQ
What is the maximum junction temperature rating for LT7101HUHE#TRPBF?
The LT7101HUHE#TRPBF is specified for operation from –40°C to 150°C junction temperature, making it suitable for under-hood automotive, avionics, and industrial environments where ambient temperatures exceed 105°C. This H-grade qualification is confirmed in the Absolute Maximum Ratings table and guaranteed across the full operating range per Analog Devices' datasheet Rev. A.
Does LT7101HUHE#TRPBF require an external current-sense resistor?
No, the LT7101HUHE#TRPBF does not require an external current-sense resistor. It implements lossless inductor current sensing using internal top and bottom MOSFET current reconstruction, enabling accurate average current programming via the ICTRL pin and monitoring via the IMON pin - both fully integrated within the LT7101HUHE#TRPBF die.
Can LT7101HUHE#TRPBF operate with 100% duty cycle?
Yes, the LT7101HUHE#TRPBF supports true 100% duty cycle operation using an internal charge pump that maintains the BOOST-to-SW voltage during extended high-side conduction. This feature eliminates dropout at low differential voltages - for example, sustaining 12V output from a 12.5V input - and is explicitly documented in the Features and Electrical Characteristics sections of the LT7101HUHE#TRPBF datasheet.
What package type and thermal characteristics does LT7101HUHE#TRPBF use?
The LT7101HUHE#TRPBF uses a 36-lead 5mm × 6mm plastic QFN package with exposed PGND pad (UHE). Its thermal resistance is θJA = 38°C/W and θJC = 5°C/W when the exposed pad is soldered to a 4-layer PCB with 1-in² copper area, enabling reliable 1A operation at 150°C junction temperature - as verified in the Package Description and Absolute Maximum Ratings tables.
How is the switching frequency programmed on LT7101HUHE#TRPBF?
The switching frequency of LT7101HUHE#TRPBF is programmed via the FREQ pin: connect to SGND for 300kHz, to INTVCC for 1MHz, or to a resistor-to-SGND to set 200kHz–2MHz. The pin sources 40µA, so RFREQ = VREF/40µA defines frequency - e.g., 12.5kΩ yields 200kHz. External clock synchronization is also supported via PLLIN/MODE pin, as detailed in the Oscillator and PLL section of the LT7101HUHE#TRPBF datasheet.
LT7101HUHE#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:
- 1A
- Frequency - Switching:
- 200kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LT7101HUHE#TRPBF FAQ
1.How can I place an order for LT7101HUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7101HUHE#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 LT7101HUHE#TRPBF reliable?
The price and inventory of LT7101HUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7101HUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT7101HUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7101HUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7101HUHE#TRPBF?
LT7101HUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7101HUHE#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 LT7101HUHE#TRPBF?
For technical support, including LT7101HUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7101HUHE#TRPBF requirements.
6.How does Aetrix verify that LT7101HUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT7101HUHE#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 LT7101HUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT7101HUHE#TRPBF?
All LT7101HUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7101HUHE#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 LT7101HUHE#TRPBF part is unused and in its original packaging.
Return procedure for LT7101HUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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