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Analog Devices Inc. LT7101MPUHE#TRPBF
- Part No.:
- LT7101MPUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LT7101MPUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,859
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Product details
Overview
LT7101MPUHE#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 to VIN output. It features 35ns minimum on-time, 2µA quiescent current at 48VIN→3.3VOUT, and fast current programming without external sense resistor-used in high-reliability battery chargers and avionics power supplies.
For engineers reviewing the LT7101MPUHE#TRPBF datasheet, LT7101MPUHE#TRPBF pinout, LT7101MPUHE#TRPBF application, or LT7101MPUHE#TRPBF equivalent, key selection criteria include wide-input voltage range (4.4–105V), ultralow EMI compliance (CISPR 25 Class 5), programmable fixed frequency (200kHz–2MHz), and –55°C to 150°C extended temperature operation.
Technical Context
The LT7101MPUHE#TRPBF implements constant-frequency average current mode control using internal top/bottom MOSFET current sensing and lossless inductor current reconstruction. Its architecture enables precise current regulation and fast transient response without external RSENSE, supported by an integrated ramp generator (RIND pin) and dual-loop compensation via ITH.
It integrates a bypass EXTVCC LDO (3.1V–40V input) to power INTVCC, enabling high-efficiency operation across wide VIN–VOUT differentials. The device supports three light-load modes-Burst Mode®, pulse-skipping, and forced continuous-with PLL synchronization (200kHz–2MHz) and 100% duty cycle capability for ultra-low dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 100V industrial/avionics bus rails without pre-regulation |
| Output Current | Up to 1A - delivers full rated current with thermal derating per θJA = 38°C/W in 5mm × 6mm QFN |
| Quiescent Current | 2µA at 48VIN→3.3VOUT - enables always-on systems with multi-year battery life in low-power monitoring applications |
| Min On-Time | 35ns - enables stable 300kHz operation down to 0.5V output from 100V input (300:1 step-down ratio) |
| Switching Frequency | 200kHz to 2MHz - programmable via resistor or PLL-synchronized to external clock for EMI reduction and multi-phase coordination |
| Operating Temp | –55°C to 150°C - qualified for military, aerospace, and downhole oil & gas electronics requiring extreme-temperature reliability |
| EMI Performance | CISPR 25 Class 5 compliant - achieves radiated emission margin without shielding or ferrites in typical 48VIN→5V/1A layout |
Pinout & Package
LT7101MPUHE#TRPBF is housed in a thermally enhanced 36-lead (5mm × 6mm) plastic QFN package with exposed PGND pad (Pin 37), rated for 150°C junction temperature and θJC = 5°C/W. The package requires soldering of the exposed pad to PCB ground for full electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 30,31,32) | Main power input | Supplies high-side MOSFET drain and powers internal VIN LDO (INTVCC); requires local 47µF ceramic + bulk capacitance |
| SW (Pins 24,25,26) | Power switch node | Connects to output inductor; carries full switching current and must be routed with minimal loop area for EMI control |
| PGND/Exposed Pad (35,36,37) | Power ground return | Primary return path for high di/dt currents; exposed pad must be solid-soldered to inner-layer ground plane |
| ICTRL (Pin 16) | Average current setpoint | 0.4V–1.3V input sets 0–1.11A average output current; internal 20µA pull-up enables single-resistor programming |
| IMON (Pin 17) | Current monitor output | 0.4V–1.3V analog voltage proportional to average output current (1.21V/A), referenced to SGND |
| FREQ (Pin 11) | Frequency control | Sources 40µA; resistor to SGND sets 200kHz–2MHz; tie to INTVCC for 1MHz or SGND for 300kHz |
| PLLIN/MODE (Pin 12) | Sync & light-load mode | Rising-edge synchronized to external clock (200kHz–2MHz); floating/SGND = Burst Mode®, INTVCC = forced continuous |
| EXTVCC (Pin 20) | Bypass LDO input | Enables INTVCC sourcing from VOUT (3.3V–40V), reducing VIN LDO dissipation and improving efficiency above 24V input |
Key Features
| Feature | Design Value |
|---|---|
| Fast current programming | 0–1.11A average output current set via ICTRL voltage (0.4V–1.3V), no external sense resistor required |
| Ultralow EMI design | CISPR 25 Class 5 compliant radiated emissions achieved with standard 4-layer PCB and no shielding |
| Wide-input operation | 4.4V–105V input range supports 12V, 24V, 48V, 72V, and 100V bus architectures without external components |
| Extended temperature grade | –55°C to 150°C operation verified per MIL-STD-883, suitable for space-constrained military and downhole applications |
| Three light-load modes | Selectable Burst Mode® (lowest IQ), pulse-skipping (low ripple), or forced continuous (best noise immunity) |
Applications
| Battery Chargers and CC/CV Supplies | Automotive and Military Systems |
|---|---|
Use Scenario: Constant-current/constant-voltage charging of Li-ion, lead-acid, or supercapacitor banks from variable 24–72V vehicle or platform buses. IC Role / Device Role / Timing Role: Primary buck regulator with programmable current limit (ICTRL) and accurate current monitor (IMON) for closed-loop charge control. Use Value: Eliminates external current sense resistor and amplifier, reducing BOM cost and board area while maintaining ±1.2% current accuracy over temperature. | Use Scenario: Power conversion in engine control units (ECUs), radar subsystems, and electronic warfare modules operating in under-hood or airborne environments. IC Role / Device Role / Timing Role: High-reliability 48VIN→5V/1A or 12VIN→3.3V/1A point-of-load regulator with extended temperature qualification and CISPR 25 compliance. Use Value: Enables single-chip solution meeting MIL-PRF-38534 Class H requirements and automotive EMC standards without added filtering. |
| Industrial, Avionics and Heavy Equipment | Medical Instruments and Telecommunication Systems |
Use Scenario: Powering FPGA, DSP, or ADC subsystems in rail signaling, wind turbine controllers, and flight data recorders where input voltage varies from 36V to 100V. IC Role / Device Role / Timing Role: Wide-input synchronous buck converter with 100% duty cycle support for brownout resilience and low-dropout operation during line sag. Use Value: Maintains regulated output down to VIN = VOUT + 0.3V, avoiding system reset during transient undervoltage events. | Use Scenario: Isolated auxiliary supply generation in MRI gradient amplifiers, ultrasound beamformers, and 5G base station RF front-ends requiring low-noise, low-EMI bias rails. IC Role / Device Role / Timing Role: Low-ripple, low-EMI 48VIN→12V/1A or 3.3V/1A regulator with selectable light-load mode and PLL synchronization to system clock. Use Value: Reduces conducted and radiated noise coupling into sensitive analog signal chains, eliminating need for post-regulator LDOs. |
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), 5mm × 5mm package, no EXTVCC LDO or ICTRL current programming | Optimized for low-VIN, high-current POL in compute and telecom; lacks wide-input and current-programming capability | Select LTC3310S only for ≤6V input, high-current digital rail applications where current programming is unnecessary |
| LM5164QPWPRQ1 | 4.5V–65V input, 1A, 1.5MHz max freq, no current monitor or ICTRL pin, AEC-Q100 Grade 1 (–40°C to 125°C) | Automotive-qualified but limited to 65V input and lacks current programming/monitoring functionality | Select LM5164QPWPRQ1 only for automotive body electronics with <65V input and no requirement for programmable current limiting |
Compared with LTC3310S and LM5164QPWPRQ1, the LT7101MPUHE#TRPBF uniquely combines 105V input, –55°C to 150°C operation, and integrated current programming/monitoring-making it the only option for high-reliability, wide-input, current-controlled buck applications in avionics and defense.
Availability
LT7101MPUHE#TRPBF is available at Aetrix Electronics and suitable for battery chargers, avionics power supplies, and military-grade embedded systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT7101MPUHE#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 LT7101MPUHE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC regulators, designed specifically for rugged, wide-input, high-reliability power conversion in aerospace, defense, and industrial control systems.
FAQ
What is the maximum input voltage rating for the LT7101MPUHE#TRPBF?
The LT7101MPUHE#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 and transportation bus systems without external protection circuitry. The LT7101MPUHE#TRPBF's robust input stage includes integrated overvoltage lockout (OVLO) and input overvoltage protection.
Does the LT7101MPUHE#TRPBF require an external current sense resistor?
No, the LT7101MPUHE#TRPBF does not require an external current sense resistor. It implements lossless inductor current sensing using internal MOSFET RDS(ON) monitoring and a reconstructed ramp signal (via RIND pin). Average output current is programmed via ICTRL voltage (0.4V–1.3V) and monitored on IMON pin (0.4V–1.3V), both with ±1.2% accuracy over temperature.
What is the purpose of the EXTVCC pin on the LT7101MPUHE#TRPBF?
The EXTVCC pin on the LT7101MPUHE#TRPBF connects to an external 3.3V–40V supply (typically the output rail) to power the internal INTVCC LDO, bypassing the VIN-based LDO. This reduces power dissipation and improves efficiency-especially at high input voltages-while enabling reliable startup when VIN is marginal. The LT7101MPUHE#TRPBF uses EXTVCC automatically when present and valid.
Can the LT7101MPUHE#TRPBF operate with 100% duty cycle?
Yes, the LT7101MPUHE#TRPBF supports true 100% duty cycle operation via its internal charge pump and floating gate drive architecture. This enables ultra-low dropout regulation-for example, maintaining 12V output with VIN as low as 12.3V-critical for brownout resilience in battery-powered and vehicle systems. The LT7101MPUHE#TRPBF maintains regulation without dropout even during sustained low-VIN conditions.
What are the supported light-load operating modes for the LT7101MPUHE#TRPBF?
The LT7101MPUHE#TRPBF supports three selectable light-load modes: Burst Mode® (2µA IQ, lowest power), pulse-skipping (moderate ripple, medium efficiency), and forced continuous conduction mode (lowest noise, best transient response). Mode selection is controlled via the PLLIN/MODE pin: floating or tied to SGND enables Burst Mode®, tied to INTVCC forces continuous mode, and pulled to INTVCC via 100kΩ enables pulse-skipping.
LT7101MPUHE#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:
- -55°C ~ 150°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LT7101MPUHE#TRPBF FAQ
1.How can I place an order for LT7101MPUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7101MPUHE#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 LT7101MPUHE#TRPBF reliable?
The price and inventory of LT7101MPUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7101MPUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT7101MPUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7101MPUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7101MPUHE#TRPBF?
LT7101MPUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7101MPUHE#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 LT7101MPUHE#TRPBF?
For technical support, including LT7101MPUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7101MPUHE#TRPBF requirements.
6.How does Aetrix verify that LT7101MPUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT7101MPUHE#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 LT7101MPUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT7101MPUHE#TRPBF?
All LT7101MPUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7101MPUHE#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 LT7101MPUHE#TRPBF part is unused and in its original packaging.
Return procedure for LT7101MPUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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