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Analog Devices Inc. LT7101IUHE#TRPBF
- Part No.:
- LT7101IUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LT7101IUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,664
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Product details
Overview
LT7101IUHE#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. It is used in high-reliability industrial power supplies requiring wide-input, low-EMI regulation.
For engineers reviewing the LT7101IUHE#TRPBF datasheet, LT7101IUHE#TRPBF pinout, LT7101IUHE#TRPBF application, or LT7101IUHE#TRPBF equivalent, key selection criteria include its 105V absolute max input rating, programmable 200kHz–2MHz switching frequency, brick-wall current limit, CISPR 25-compliant EMI performance, and thermally enhanced 5mm × 6mm QFN package with exposed PGND pad.
Technical Context
The LT7101IUHE#TRPBF implements constant-frequency average current mode control using internal reconstruction of inductor current via top/bottom switch sensing-eliminating need for external sense resistor. Its architecture supports 100% duty cycle operation via charge-pump–assisted BOOST supply and integrates OPTI-LOOP® or fixed internal compensation.
It delivers fast current programming via ICTRL pin (0.4V–1.3V → 0A–1.11A avg), monitors output current on IMON pin (0.4V–1.3V), and enables synchronization via PLLIN/MODE pin with external clock input. Eight fixed output voltages (1.2V–15V) are selectable via VPRG1/VPRG2 pins, or adjustable mode via VFB divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 100V industrial bus rails without pre-regulation |
| Output Current | Up to 1A continuous - sufficient for powering FPGA I/O banks, sensor signal chains, or isolated gate drivers |
| Min On-Time | 35ns - enables stable 3.3V/5V output from 72V+ inputs at 300kHz+ switching frequency |
| IQ in Regulation | 2µA at 48VIN/3.3VOUT - enables always-on monitoring circuits in battery-backed systems |
| Switching Frequency | 200kHz to 2MHz - programmable via FREQ pin resistor; allows optimization of size vs. EMI vs. light-load efficiency |
| EMI Performance | CISPR 25 Class 5 compliant - meets automotive radiated emission limits without added filtering |
| Package | 36-lead 5mm × 6mm QFN with exposed PGND pad - provides θJA = 38°C/W for high-power density thermal management |
Pinout & Package
LT7101IUHE#TRPBF is housed in a thermally enhanced 36-lead plastic QFN (5mm × 6mm), with exposed pad (Pin 37) soldered to PCB PGND for optimal thermal and electrical performance. The package supports –40°C to +125°C junction temperature operation.
| 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 | Accepts up to 105V; powers internal high-side MOSFET and VIN LDO - requires local ceramic decoupling to PGND |
| SW (24,25,26) | Power switch node | Connects to external inductor; carries full switching current - must be routed with low-inductance, high-current copper |
| PGND/Exposed Pad (35,36,37) | Power ground reference | Primary return path for high di/dt currents; exposed pad must be solid-soldered to thermal plane for θJC = 5°C/W |
| ICTRL (16) | Average current setpoint | 0.4V–1.3V input programs 0A–1.11A avg output current - enables CC/CV battery charging or LED driver control |
| IMON (17) | Current monitor output | 0.4V–1.3V analog voltage proportional to average output current - enables real-time load telemetry without shunt |
| FREQ (11) | Frequency programming | Sources 40µA; resistor to SGND sets fSW from 200kHz to 2MHz - determines inductor size and EMI profile |
| PLLIN/MODE (12) | Sync & light-load mode control | Accepts external clock for synchronization; tied to SGND/INTVCC selects Burst Mode/pulse-skipping/forced continuous |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Internal lossless current reconstruction eliminates RSENSE power loss, board space, and thermal drift errors |
| Brick-wall current limit | Hard current limit at 1.00A avg (ICTRL = FLOAT) prevents overcurrent damage during short-circuit or overload |
| EXTVCC LDO input | Accepts 3.3V–40V external supply to power INTVCC - improves efficiency by bypassing VIN LDO under high-VIN conditions |
| Input/Output overvoltage protection | OVLO pin shuts down regulator if VIN exceeds programmed threshold; VFB OVP trips at ±10% of regulated voltage |
| Thermally robust QFN | 5mm × 6mm package with exposed PGND pad achieves θJA = 38°C/W - sustains 1A load at +85°C ambient without derating |
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 telemetry. IC Role / Device Role / Timing Role: Primary buck controller providing programmable CC/CV output with real-time current monitoring via IMON pin. Use Value: Eliminates external current sense resistor and amplifier, reducing BOM cost and improving accuracy over temperature (±1.5% IMON error). | Use Scenario: Power supply for radar front-end modules in 24V/28V vehicle platforms with strict EMI requirements. IC Role / Device Role / Timing Role: High-input buck regulator delivering 3.3V/1A with CISPR 25 Class 5 compliance and 105V abs-max tolerance. Use Value: Meets automotive EMC standards without ferrite beads or common-mode chokes, simplifying layout and qualification. |
| Industrial, Avionics and Heavy Equipment | Medical Instruments and Telecommunication Systems |
Use Scenario: 72V rail-to-5V conversion for PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Wide-input synchronous buck converter with 35ns min on-time enabling direct 72V→5V conversion at 300kHz. Use Value: Avoids cascaded regulation stages, improving system efficiency by >8% and reducing component count by 30%. | Use Scenario: Point-of-load regulator for FPGA core voltage in telecom base station equipment with remote current monitoring. IC Role / Device Role / Timing Role: Adjustable-output buck IC delivering 1.2V/1A with ICTRL-programmed current limit and IMON-based telemetry. Use Value: Enables dynamic current limiting and health reporting over digital interface, supporting predictive maintenance protocols. |
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 2.75V–5.5V input range; 3A output; no 105V rating or ICTRL-based current programming | Targeted at low-voltage DC/DC in portable electronics, not high-VIN industrial systems | Select when input is ≤5.5V and higher output current is required; not suitable for 48V+ rails |
| LM5164QPWPRQ1 | 65V max input; no integrated current monitor or ICTRL programming; requires external RSENSE for current limiting | Designed for automotive body electronics with AEC-Q100 qualification, but lacks advanced current control features | Choose for cost-sensitive AEC-Q100 designs where 105V rating and precision current control are unnecessary |
Compared with LTC3310S and LM5164QPWPRQ1, the LT7101IUHE#TRPBF uniquely combines 105V input capability, resistorless current programming/monitoring, and CISPR 25 compliance - making it the only option for compact, high-reliability 48V–100V industrial buck regulation with telemetry.
Availability
LT7101IUHE#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, avionics DC/DC converters, and medical instrument point-of-load regulation requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT7101IUHE#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 LT7101IUHE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage monolithic DC/DC regulators, designed specifically for ruggedized industrial and transportation systems demanding wide-input operation, low EMI, and accurate current control without external sensing components.
FAQ
What is the maximum input voltage rating for the LT7101IUHE#TRPBF?
The LT7101IUHE#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 100V industrial bus rails without pre-regulation. Exceeding 105V during normal operation risks violating the recommended operating conditions, though the 110V abs-max rating provides margin against transients. The LT7101IUHE#TRPBF's OVLO pin can be configured to shut down the device if input exceeds a user-defined threshold.
Does the LT7101IUHE#TRPBF require an external current sense resistor?
No, the LT7101IUHE#TRPBF does not require an external current sense resistor. It uses internal lossless current reconstruction by monitoring top and bottom switch currents and replicating the inductor ramp, enabling accurate average current programming via the ICTRL pin and monitoring via the IMON pin. This eliminates RSENSE power loss, board area, and temperature-induced gain drift - a key differentiator confirmed in the datasheet's "Fast and Accurate Output Current Programming and Monitoring with No External RSENSE" feature list. The LT7101IUHE#TRPBF maintains ±1.5% IMON accuracy across temperature.
How is the switching frequency set on the LT7101IUHE#TRPBF?
The switching frequency of the LT7101IUHE#TRPBF is set via the FREQ pin, which sources a 40µA current. A resistor from FREQ to SGND programs fSW from 200kHz to 2MHz. Tying FREQ to SGND yields ~300kHz; tying to INTVCC yields ~1MHz. The datasheet specifies ±15% accuracy across this range. For synchronization, the PLLIN/MODE pin accepts an external clock (200kHz–2MHz), forcing the SW rising edge to align with the external clock - critical for multi-rail systems avoiding beat frequencies. The LT7101IUHE#TRPBF supports both free-running and synchronized operation without changing external components.
What thermal performance can be expected from the LT7101IUHE#TRPBF in a standard PCB layout?
In a standard 4-layer PCB with 2oz copper and the exposed PGND pad fully soldered to an internal ground plane, the LT7101IUHE#TRPBF achieves θJA = 38°C/W and θJC = 5°C/W. At 1A output and 48V input, typical power dissipation is ~0.8W, resulting in ~30°C junction rise above ambient - well within its –40°C to +125°C operating range. The datasheet confirms TJMAX = 150°C and specifies thermal derating above 125°C. Proper thermal vias under the exposed pad (≥9 vias, 0.3mm diameter) are essential to realize the rated θJA; insufficient thermal relief will cause premature thermal shutdown. The LT7101IUHE#TRPBF includes overtemperature protection that activates above TJ ≈ 160°C.
Can the LT7101IUHE#TRPBF operate in 100% duty cycle mode?
Yes, the LT7101IUHE#TRPBF supports true 100% duty cycle operation via an internal charge pump that maintains BOOST-to-SW voltage even when the high-side MOSFET is continuously on. This enables dropout-free regulation at ultra-low differential voltages - for example, delivering 4.8V from a 5V input. The charge pump is enabled automatically when needed and does not require external components. This capability is explicitly stated in the datasheet's "100% Maximum Duty Cycle Operation" feature and verified in Figure 14's 5V-to-5V test circuit. The LT7101IUHE#TRPBF maintains regulation stability and current limit integrity throughout 100% duty cycle operation.
LT7101IUHE#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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LT7101IUHE#TRPBF FAQ
1.How can I place an order for LT7101IUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7101IUHE#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 LT7101IUHE#TRPBF reliable?
The price and inventory of LT7101IUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7101IUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT7101IUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7101IUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7101IUHE#TRPBF?
LT7101IUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7101IUHE#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 LT7101IUHE#TRPBF?
For technical support, including LT7101IUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7101IUHE#TRPBF requirements.
6.How does Aetrix verify that LT7101IUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT7101IUHE#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 LT7101IUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT7101IUHE#TRPBF?
All LT7101IUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7101IUHE#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 LT7101IUHE#TRPBF part is unused and in its original packaging.
Return procedure for LT7101IUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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