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Analog Devices Inc. LT7101IUHE#PBF
- Part No.:
- LT7101IUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LT7101IUHE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,531
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Product details
Overview
LT7101IUHE#PBF 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 automotive battery chargers and industrial power supplies requiring wide-input, low-EMI regulation.
For engineers reviewing the LT7101IUHE#PBF datasheet, LT7101IUHE#PBF pinout, LT7101IUHE#PBF application, or LT7101IUHE#PBF equivalent, key selection criteria include its 100% duty cycle capability, CISPR 25-compliant radiated EMI performance, programmable 200kHz–2MHz switching frequency, and eight pin-selectable fixed output voltages (1.2V–15V) alongside adjustable mode.
Technical Context
The LT7101IUHE#PBF implements constant-frequency average current mode control using internal reconstruction of inductor current via top/bottom switch sensing and RIND-based ramp synthesis-enabling precise CC/CV operation without external sense resistors. Its architecture supports fast current loop response (93kHz bandwidth) and automatic OPTI-LOOP compensation scaling with switching frequency.
It integrates dual LDOs: a VIN-powered 3.5V INTVCC regulator and an EXTVCC-powered bypass LDO (3.1V–40V input), enabling high-efficiency operation across wide input-output differentials. Protection includes input/output overvoltage, thermal shutdown, and brick-wall average current limiting with ±10% accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 100V industrial/automotive bus rails without pre-regulation. |
| Output Current | 1A continuous - delivers full rated load at 105VIN/5VOUT with thermally enhanced 5mm × 6mm QFN package (θJA = 38°C/W). |
| 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 - programmable via resistor on FREQ pin; supports PLL synchronization to external clock for noise-sensitive applications. |
| Current Programming Accuracy | ±10% average output current limit - achieved via ICTRL voltage (0.4V–1.3V) with no external sense resistor, reducing BOM cost and board area. |
| EMI Performance | CISPR 25 Class 5 compliant - validated radiated emission test at 48VIN→5VOUT/1A with 400kHz switching, eliminating need for external EMI filters in automotive designs. |
| Minimum On-Time | 35ns - enables stable 3.3V output from 100V input at 300kHz (3.3% duty cycle), avoiding pulse-skipping instability. |
Pinout & Package
LT7101IUHE#PBF is housed in a thermally enhanced 36-lead (5mm × 6mm) plastic QFN package with exposed PGND pad (Pin 37) that must be soldered to PCB for rated electrical and thermal performance (TJMAX = 150°C, θJC = 5°C/W). The package supports –40°C to +125°C junction temperature operation.
| 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 from VIN sets precise undervoltage lockout threshold. |
| VIN (30,31,32) | Main power input | Connects to high-side MOSFET drain and powers internal VIN LDO; requires local ceramic decoupling to PGND. |
| SW (24,25,26) | Power switch node | Drives external inductor; connects to BOOST capacitor (0.1µF) for high-side gate drive; shared between three pins for low-inductance routing. |
| PGND/Exposed Pad (35,36,37) | Power ground return | Primary return path for high-current switching loops; exposed pad must be solidly soldered to PCB ground plane for thermal and EMI performance. |
| ICTRL (16) | Average current setpoint | Voltage input (0.4V–1.3V) programs 0A–1.11A average output current; internal 20µA pull-up enables single-resistor programming. |
| IMON (17) | Current monitor output | Analog voltage (0.4V–1.3V) proportional to average output current (0A–1.11A); enables real-time load monitoring without sense resistor. |
| FREQ (11) | Switching frequency control | Sources 40µA; resistor to SGND sets fSW from 200kHz to 2MHz; low capacitance required for Burst Mode stability. |
| PLLIN/MODE (12) | Sync input / light-load mode select | Accepts external clock for forced continuous sync; tied to SGND/float = Burst Mode, INTVCC = pulse-skipping, 100kΩ to INTVCC = forced continuous. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI/EMC emissions | CISPR 25 Class 5 compliance verified at 48V→5V/1A - eliminates need for external EMI filters in automotive and industrial applications. |
| Fast current programming & monitoring | 0.4V–1.3V ICTRL input sets 0A–1.11A average output current; IMON provides corresponding 0.4V–1.3V analog monitor - no RSENSE or amplifier required. |
| 100% duty cycle operation | Internal charge pump maintains BOOST-SW voltage during continuous conduction - enables dropout-free regulation down to VOUT ≈ VIN – 0.3V. |
| Programmable light-load modes | Selectable Burst Mode®, pulse-skipping, or forced continuous operation - optimizes efficiency (up to 95%) and output ripple across 10µA–1A load range. |
| Wide output voltage flexibility | Eight pin-selectable fixed outputs (1.2V–15V) or fully adjustable 1V–VIN via VFB divider - supports diverse system rail requirements with single BOM part. |
| Robust protection suite | Input/output overvoltage lockout, thermal shutdown, reverse current limiting (0A/0.4A), and PGOOD fault reporting - enhances reliability in harsh environments. |
Applications
| Battery Chargers | Automotive Power Systems |
|---|---|
|
Use Scenario: Constant-current/constant-voltage charging of 12V–48V Li-ion or lead-acid battery banks in EV auxiliary systems or off-grid solar storage. IC Role / Device Role / Timing Role: Primary buck regulator providing programmable CC/CV output with fast current loop response (93kHz) for tight charge profile control. Use Value: Eliminates external current sense resistor and amplifier, reducing BOM cost by $0.15+ and PCB area by >8mm² while maintaining ±10% current accuracy over temperature. |
Use Scenario: Powering infotainment, ADAS cameras, and telematics modules from 12V/24V/48V vehicle batteries with stringent CISPR 25 EMI limits. IC Role / Device Role / Timing Role: High-voltage buck converter with integrated EMI reduction features and PLL synchronization to avoid band-specific interference. Use Value: Meets Class 5 radiated emission limits without ferrite beads or common-mode chokes, cutting filter component count by 3–5 parts and simplifying layout validation. |
| Industrial 48V Equipment | Avionics & Heavy Machinery |
|
Use Scenario: Generating 3.3V/5V/12V rails for PLC I/O modules, motor drives, and sensors operating from unregulated 48V factory bus with brownout tolerance. IC Role / Device Role / Timing Role: Wide-input synchronous buck with 4.4V UVLO, 105V abs max rating, and 2µA sleep current for fail-safe operation during line dips. Use Value: Supports direct connection to 48V PoE++ or telecom rectifiers without pre-regulator stage, improving system efficiency by 8–12% versus two-stage conversion. |
Use Scenario: Powering flight control computers and radar subsystems in helicopters and UAVs where input can swing from 28V nominal to 100V transients. IC Role / Device Role / Timing Role: High-reliability buck regulator with –40°C to +125°C operation, input overvoltage protection (OVLO), and robust thermal design (θJC = 5°C/W). Use Value: Withstands MIL-STD-704F transient spikes up to 100V without latch-up or derating, reducing need for upstream TVS clamping and associated voltage drop. |
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 | 4.5V–22V input, 10A output, 5mm × 6mm QFN - lacks 105V rating and average current mode; uses peak current mode control. | Targeted at lower-voltage, higher-current computing/ASIC rails; unsuitable for 48V+ industrial inputs. | Select LTC3310S only when input stays below 22V and >5A output is required; LT7101IUHE#PBF remains sole choice for >40V input with current programming. |
| LM5164QPWPRQ1 | 3.5V–100V input, 1A output, SOIC-10 - no integrated current monitor, no Burst Mode, larger solution size, higher IQ (15µA). | Designed for cost-sensitive automotive body electronics; lacks EMI certification and precision current control. | Choose LM5164QPWPRQ1 for basic 100V buck needs where current monitoring and CISPR 25 compliance are not required; LT7101IUHE#PBF adds critical functionality for advanced power management. |
Compared with LTC3310S and LM5164QPWPRQ1, the LT7101IUHE#PBF uniquely combines 105V operation, ±10% programmable average current control without RSENSE, and certified CISPR 25 EMI performance - making it irreplaceable for high-voltage, current-critical, and EMI-sensitive applications.
Availability
LT7101IUHE#PBF is available at Aetrix Electronics and suitable for battery chargers, automotive power systems, and industrial 48V equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT7101IUHE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LT7101IUHE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC regulators, engineered specifically for demanding applications requiring wide input range, low EMI, and precise current control in harsh environments.
FAQ
What is the maximum input voltage rating for the LT7101IUHE#PBF?
The LT7101IUHE#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 100V industrial and automotive power buses without external pre-regulation stages. Operation beyond 105V is not specified and may compromise reliability or safety margins.
Does the LT7101IUHE#PBF require an external current sense resistor?
No, the LT7101IUHE#PBF does not require an external current sense resistor. It achieves accurate average output current programming and monitoring through internal sensing of top and bottom switch currents combined with RIND-based ramp synthesis. ICTRL and IMON pins provide voltage-controlled current setpoint and analog monitor output respectively.
How does the LT7101IUHE#PBF achieve CISPR 25 compliance?
The LT7101IUHE#PBF achieves CISPR 25 Class 5 radiated emission compliance through optimized internal gate drive timing, integrated slew-rate control, and a proprietary Silent Switcher®-inspired layout within the 5mm × 6mm QFN package. Verified test data shows <40dBµV/m margin at 48V→5V/1A with 400kHz switching, eliminating need for external EMI filters.
What are the supported light-load operating modes for the LT7101IUHE#PBF?
The LT7101IUHE#PBF supports three selectable light-load modes via the PLLIN/MODE pin: Burst Mode® (pin floating or tied to SGND), pulse-skipping (pin tied to INTVCC through 100kΩ), and forced continuous conduction (pin tied to INTVCC). Each mode optimizes trade-offs between efficiency, output ripple, and EMI across the 10µA–1A load range.
Can the LT7101IUHE#PBF operate with 100% duty cycle?
Yes, the LT7101IUHE#PBF supports true 100% duty cycle operation using an internal charge pump that maintains BOOST-SW voltage even when the high-side MOSFET is continuously on. This enables dropout-free regulation down to VOUT ≈ VIN – 0.3V, critical for applications like battery backup systems where input voltage sags near output level.
LT7101IUHE#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:
- 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#PBF FAQ
1.How can I place an order for LT7101IUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7101IUHE#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 LT7101IUHE#PBF reliable?
The price and inventory of LT7101IUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7101IUHE#PBF is usually 5 days.
3.What payment methods are accepted for LT7101IUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7101IUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7101IUHE#PBF?
LT7101IUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7101IUHE#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 LT7101IUHE#PBF?
For technical support, including LT7101IUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7101IUHE#PBF requirements.
6.How does Aetrix verify that LT7101IUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LT7101IUHE#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 LT7101IUHE#PBF meets industry standards.
7.What is the process for return or replacement of LT7101IUHE#PBF?
All LT7101IUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7101IUHE#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 LT7101IUHE#PBF part is unused and in its original packaging.
Return procedure for LT7101IUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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