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Analog Devices Inc. LT7101EUHE#PBF
- Part No.:
- LT7101EUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LT7101EUHE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,933
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Product details
Overview
LT7101EUHE#PBF from Analog Devices is a 105V, 1A monolithic synchronous step-down DC/DC regulator with average current mode control, 4.4V–105V input range, 1V–VIN adjustable output, and 35ns minimum on-time. It delivers fast current programming without external sense resistors and supports Burst Mode, pulse-skipping, or forced continuous operation for optimized light-load efficiency in high-reliability power systems.
For engineers reviewing the LT7101EUHE#PBF datasheet, LT7101EUHE#PBF pinout, LT7101EUHE#PBF application, or LT7101EUHE#PBF equivalent, key selection considerations include its 100% duty cycle capability, CISPR 25-compliant low-EMI operation, programmable 200kHz–2MHz switching frequency, and integrated EXTVCC LDO enabling efficient 3.3V–40V auxiliary supply sourcing.
Technical Context
The LT7101EUHE#PBF employs constant-frequency average current mode control with internal reconstruction of inductor current via top/bottom switch sensing and RIND-based ramp synthesis-enabling precise, resistorless current regulation across wide duty cycles. Its architecture integrates a high-speed average current amplifier (gm = 1.52 mS), OPTI-LOOP® or fixed compensation, and dual LDOs (VIN- and EXTVCC-derived INTVCC) to sustain operation from 4.4V up to 105V input.
It features synchronized PWM with PLL input support, brick-wall average current limiting (1.00–1.21A), fast current monitoring (IMON output), and comprehensive protection including input/output overvoltage, thermal shutdown, and reverse-current detection. The 36-lead 5mm × 6mm QFN package provides θJC = 5°C/W thermal resistance for high-power-density designs.
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 | Up to 1A continuous - sustained at full load with thermal derating per junction temperature (TJ ≤ 125°C for E-grade). |
| Switching Frequency | 200kHz to 2MHz - programmable via FREQ pin resistor; enables optimization of size (high-freq) vs. efficiency (low-freq). |
| Min On-Time | 35ns - allows stable operation at ultra-high step-down ratios (e.g., 100V→3.3V @ 300kHz) without pulse skipping. |
| IQ in Regulation | 2µA @ 48VIN/3.3VOUT - enables always-on battery-backed systems with multi-year standby life. |
| Current Sense | No external RSENSE required - accurate average current programming/monitoring via ICTRL/IMON pins with ±2% typical error. |
| EMI Performance | CISPR 25 Class 5 compliant - achieved via spread-spectrum-capable oscillator, optimized SW node layout, and integrated boost capacitor drive. |
Pinout & Package
LT7101EUHE#PBF is housed in a thermally enhanced 36-lead (5mm × 6mm) plastic QFN package with exposed PGND pad (Pin 37), rated for –40°C to +125°C operating junction temperature. The package requires soldering of the exposed pad to PCB ground for specified electrical performance and thermal dissipation (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 30,31,32) | Main power input | Connects to 4.4V–105V source; supplies top MOSFET drain and VIN LDO for INTVCC generation. |
| SW (Pins 24,25,26) | Power switch node | Drives external inductor; connects internally to both top and bottom N-channel MOSFETs. |
| PGND / Exposed Pad (Pins 35,36,37) | Power ground return | Mandatory PCB ground connection for thermal management and low-impedance high-current return path. |
| ICTRL (Pin 16) | Average current setpoint input | 0.4V–1.3V analog voltage programs 0A–1.11A average output current; internal 20µA pull-up enables single-resistor programming. |
| IMON (Pin 17) | Current monitor output | 0.4V–1.3V output proportional to average output current (1.21V/A typical); enables real-time load telemetry. |
| FREQ (Pin 11) | Frequency control | Sinks 40µA; resistor to SGND sets fSW from 200kHz to 2MHz - critical for EMI filtering and inductor sizing. |
| PLLIN/MODE (Pin 12) | Sync clock input / light-load mode select | Accepts external 200kHz–2MHz clock for synchronization; also selects Burst Mode (float/SGND), pulse-skipping (100kΩ to INTVCC), or forced CCM (INTVCC). |
| EXTVCC (Pin 20) | Auxiliary LDO input | Enables INTVCC sourcing from regulated VOUT (3.3V–40V), reducing VIN LDO losses and improving full-load efficiency by ~2%. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI emission | CISPR 25 Class 5 compliance achieved without external filters - reduces system-level EMC test risk and board area. |
| Resistorless current programming | ICTRL pin accepts 0.4V–1.3V to set average output current from 0A to 1.11A with ±2% accuracy - eliminates sense resistor power loss and layout sensitivity. |
| 100% duty cycle operation | Internal charge pump maintains BOOST-SW voltage during continuous top-FET conduction - enables dropout-free regulation down to VOUT ≈ VIN – 0.5V. |
| Three light-load modes | Selectable Burst Mode (low IQ), pulse-skipping (low ripple), or forced CCM (lowest noise) - matches trade-offs between efficiency, output ripple, and EMI. |
| Integrated EXTVCC LDO | Derives INTVCC from VOUT (3.3V–40V), bypassing VIN LDO - improves full-load efficiency by reducing VIN-to-INTVCC dropout losses. |
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 or 72V military supply. IC Role / Device Role / Timing Role: Primary buck regulator providing programmable CC limit (via ICTRL) and precise CV regulation (±0.5% VFB accuracy) with fault-safe OVLO shutdown. Use Value: Eliminates external current-sense resistor and op-amp, reducing BOM cost and thermal footprint while maintaining <1% current regulation accuracy across temperature. |
Use Scenario: Power conversion for radar transceivers, engine control units, and avionics displays operating from 28V or 270V DC aircraft buses. IC Role / Device Role / Timing Role: High-input-voltage DC/DC stage delivering 3.3V/5V/12V with CISPR 25 radiated emissions compliance and 150°C junction-rated variants available. Use Value: Enables single-stage conversion from harsh 100V transients without front-end TVS clamping, reducing component count and improving system reliability. |
| Industrial and Heavy Equipment | Medical Instruments and Telecom |
|
Use Scenario: Powering PLC I/O modules, motor drives, and sensors from unregulated 24V–72V factory floor supplies subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Input-robust buck controller with 110V absolute max rating, UVLO hysteresis (100mV), and programmable OVLO threshold (1.21V). Use Value: Survives 100V load-dump pulses without shutdown or latch-off, eliminating need for upstream transient suppressors in DIN-rail power systems. |
Use Scenario: Point-of-load regulation for FPGA, ADC, and RF transceiver rails in portable ultrasound, patient monitors, and 5G small-cell base stations. IC Role / Device Role / Timing Role: Low-noise, low-EMI power stage supporting dynamic load steps (50mA→500mA in 40µs) with minimal VOUT deviation (<100mV). Use Value: Delivers clean, fast-transient power with <25µs PGOOD response and <100ns SW edge control - meets strict medical EMC and signal integrity requirements. |
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 2.7V–6V input range; 10A max output; no ICTRL-based current programming; uses external sense resistor. | Targeted at low-VIN, high-current computing loads-not suitable for 48V+ industrial inputs. | Select LTC3310S only when input is ≤6V and >3A output is required; LT7101EUHE#PBF remains preferred for wide-VIN, precision-current applications. |
| LM5164QPWPRQ1 | 65V max input; 1A output; peak current mode (not average); requires external RSENSE; no IMON/ICTRL interface. | Automotive AEC-Q100 qualified but lacks current-programming flexibility and low-EMI features of LT7101EUHE#PBF. | Choose LM5164QPWPRQ1 for cost-sensitive automotive body electronics where AEC-Q100 is mandatory and current programming is not needed. |
Compared with LTC3310S and LM5164QPWPRQ1, the LT7101EUHE#PBF uniquely combines 105V input tolerance, resistorless average current control, and CISPR 25 compliance-making it the only option for high-accuracy, high-VIN, low-EMI industrial battery charging and avionics power.
Availability
LT7101EUHE#PBF is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and guaranteed parametric performance across –40°C to +125°C.
Supply support for LT7101EUHE#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 since 1965.
The LT7101EUHE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC regulators, engineered specifically for rugged, low-EMI power conversion in transportation, energy, and defense applications demanding >60V input operation and precision current control.
FAQ
What is the maximum input voltage rating for the LT7101EUHE#PBF?
The LT7101EUHE#PBF 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 and transportation power buses without external pre-regulation or transient suppression beyond standard design margins.
Does the LT7101EUHE#PBF require an external current sense resistor?
No, the LT7101EUHE#PBF does not require an external current sense resistor. It implements lossless average current sensing using internal top/bottom MOSFET conduction monitoring and RIND-based ramp synthesis, enabling accurate current programming via the ICTRL pin and monitoring via the IMON pin.
How is the switching frequency set on the LT7101EUHE#PBF?
The switching frequency of the LT7101EUHE#PBF is set using the FREQ pin: tie to SGND for 300kHz, to INTVCC for 1MHz, or connect a resistor to SGND to program 200kHz–2MHz. The pin sources a precise 40µA current, so RFREQ = VREF/40µA determines frequency per the datasheet lookup table.
What thermal performance can be expected from the LT7101EUHE#PBF in a standard PCB layout?
In a standard 4-layer PCB with 2oz copper and full thermal pad soldering, the LT7101EUHE#PBF achieves θJA = 38°C/W and θJC = 5°C/W. At 1A output and 48V input, typical power dissipation is ~0.8W, resulting in ~45°C junction rise above ambient - well within the –40°C to +125°C operating range.
Can the LT7101EUHE#PBF synchronize to an external clock?
Yes, the LT7101EUHE#PBF supports external clock synchronization via the PLLIN/MODE pin. When an external 200kHz–2MHz clock is applied, the phase-locked loop aligns the rising edge of the SW signal to the external clock, enabling noise spectral spreading and multi-phase interleaving in multi-rail systems.
LT7101EUHE#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)
LT7101EUHE#PBF FAQ
1.How can I place an order for LT7101EUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7101EUHE#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 LT7101EUHE#PBF reliable?
The price and inventory of LT7101EUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7101EUHE#PBF is usually 5 days.
3.What payment methods are accepted for LT7101EUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7101EUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7101EUHE#PBF?
LT7101EUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7101EUHE#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 LT7101EUHE#PBF?
For technical support, including LT7101EUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7101EUHE#PBF requirements.
6.How does Aetrix verify that LT7101EUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LT7101EUHE#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 LT7101EUHE#PBF meets industry standards.
7.What is the process for return or replacement of LT7101EUHE#PBF?
All LT7101EUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7101EUHE#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 LT7101EUHE#PBF part is unused and in its original packaging.
Return procedure for LT7101EUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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