My Inquiry
My Account
Analog Devices Inc. LT7101EUHE#TRPBF
- Part No.:
- LT7101EUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LT7101EUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,682
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT7101EUHE#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 industrial power supplies requiring wide VIN and low EMI.
For engineers reviewing the LT7101EUHE#TRPBF datasheet, LT7101EUHE#TRPBF pinout, LT7101EUHE#TRPBF application, or LT7101EUHE#TRPBF 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 LT7101EUHE#TRPBF 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 current regulation without external sense resistors. Its architecture supports fast transient response and stable operation at ultra-high step-down ratios (e.g., 100VIN→5VOUT) due to 35ns minimum controllable on-time and adaptive OPTI-LOOP® compensation.
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 lockout (OVLO/VOV(R)), thermal shutdown, brick-wall average current limit (1.00A typ), and reverse-current limiting (0A in Burst Mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 96V industrial/military bus rails without pre-regulation. |
| Output Current | Up to 1A continuous - sufficient for powering FPGAs, microcontrollers, and analog front-ends in compact systems. |
| Quiescent Current | 2µA in regulation (48VIN/3.3VOUT) - enables always-on monitoring circuits with multi-year battery life. |
| Switching Frequency | 200kHz to 2MHz, programmable via resistor or PLL sync - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering. |
| Min. On-Time | 35ns - enables stable 5V output from 100V input at 300kHz (duty cycle ≈ 5%), avoiding pulse-skipping instability. |
| EMI Performance | CISPR 25 Class 5 compliant - meets automotive EMC requirements without added shielding or complex layout. |
| Current Sensing | No external RSENSE required - average current programming/monitoring achieved via internal ICTRL/IMON pins with ±2% accuracy. |
Pinout & Package
LT7101EUHE#TRPBF uses a thermally enhanced 36-lead (5mm × 6mm) plastic QFN package with exposed PGND pad (Pin 37) that must be soldered to PCB for rated thermal performance (θJA = 38°C/W). The package supports –40°C to +125°C junction temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 30,31,32) | Main power input | Connects to 4.4–105V supply; decoupled to PGND with ≥47µF bulk + 0.1µF ceramic capacitor. |
| SW (Pins 24,25,26) | Switch node | Drives external inductor; requires low-ESR 0.1µF BST capacitor between BOOST and SW. |
| PGND/Exposed Pad (Pins 35,36,37) | Power ground return | Must be solidly connected to PCB ground plane to ensure thermal dissipation and low-noise current return path. |
| ICTRL (Pin 16) | Average output current programming | 0.4V–1.3V input sets 0–1.11A average current limit; internal 20µA pull-up enables single-resistor programming. |
| IMON (Pin 17) | Current monitor output | 0.4–1.3V analog voltage proportional to average output current (1.21V/A typ); used for telemetry or closed-loop CC control. |
| FREQ (Pin 11) | Switching frequency control | Sources 40µA; resistor to SGND sets 200kHz–2MHz; tie to SGND for 300kHz or INTVCC for 1MHz. |
| PLLIN/MODE (Pin 12) | External clock sync / light-load mode select | Accepts 2V–5V external clock for synchronization; tied to SGND for Burst Mode, INTVCC for forced CCM, or 100kΩ to INTVCC for pulse-skipping. |
| VPRG1/VPRG2 (Pins 18,19) | Output voltage configuration | Pin-strapping selects one of eight fixed outputs (1.2V–15V) or floating for adjustable mode via VFB divider. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI emission | CISPR 25 Class 5 compliance achieved via Silent Switcher®-like layout integration, internal gate drive shaping, and optimized SW node routing - eliminates need for external EMI filters in automotive designs. |
| Fast current programming | ICTRL pin enables <10µs step response for constant-current applications (e.g., LED drivers, battery charging) without external op-amps or sense resistors. |
| 100% duty cycle operation | Internal charge pump maintains BOOST-SW voltage during extended high-side conduction - supports dropout-free operation down to VOUT = VIN − 0.3V. |
| Multiple light-load modes | Selectable Burst Mode® (lowest IQ), pulse-skipping (low ripple), or forced CCM (best noise immunity) - configurable per system sleep/wake requirements. |
| Robust protection suite | Includes input OVLO (1.21V threshold), output OVP (7–13% VFB trip), thermal shutdown, and reverse-current limiting - reduces need for external supervision ICs. |
Applications
| Battery Charger CC/CV Stage | Automotive Infotainment Power Supply |
|---|---|
|
Use Scenario: Regulating 48V vehicle battery to 12V/1A for USB-C PD or display backlight driver with tight current accuracy. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing programmable constant-current (CC) and constant-voltage (CV) stages via ICTRL/IMON feedback loop. Use Value: Eliminates external current-sense amplifier and shunt resistor, reducing BOM cost by $0.32 and PCB area by 12 mm² while maintaining ±2% current regulation. |
Use Scenario: Powering ADAS camera modules and infotainment SoCs from 12V/24V/48V automotive bus with strict CISPR 25 radiated emissions limits. IC Role / Device Role / Timing Role: High-VIN DC/DC converter delivering low-noise 3.3V/5V with synchronized switching to avoid beat frequencies with CAN/LIN clocks. Use Value: Meets Class 5 peak limits at 48VIN→5VOUT without ferrite beads or metal shields, cutting EMC debug time by >40 hours. |
| Industrial PLC I/O Module | Avionics Remote Power Node |
|
Use Scenario: Generating isolated 5V/1A for digital I/O conditioning circuits in DIN-rail mounted controllers exposed to 100V transients. IC Role / Device Role / Timing Role: Wide-input buck regulator with 110V absolute max rating and robust OVLO/UVLO hysteresis protecting downstream logic during brownouts. Use Value: Survives 100V surge events per IEC 61000-4-5 Level 4 without latch-up, enabling single-stage conversion instead of 2-stage (pre-regulator + point-of-load). |
Use Scenario: Providing 28V-to-5V/1A power for flight-critical sensors in UAVs where weight, reliability, and radiation tolerance are critical. IC Role / Device Role / Timing Role: Radiation-hardened-by-design (RHBD) buck controller operating up to 125°C junction with internal LDO redundancy (INTVCC/EXTVCC). Use Value: Reduces system weight by 3.8g versus discrete MOSFET+controller solution and extends MTBF by 2.1× via integrated thermal protection and current limiting. |
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 max, 5mm × 6mm QFN, no integrated current monitor or ICTRL pin | Better suited for high-current, low-VIN applications (e.g., server POL); lacks LT7101EUHE#TRPBF's 105V rating and current-programming capability | Choose LTC3310S when output current >1.5A is needed and input voltage stays below 22V; avoid for >40V inputs or CC-mode control. |
| MAX20006 | 3.5V–65V input, 1A, 16-pin TQFN, integrated spread-spectrum but no IMON/ICTRL interface | Optimized for automotive AEC-Q100 Grade 1 (–40°C to +125°C), but limited to 65VIN and lacks programmable current limit | Choose MAX20006 for cost-sensitive automotive body electronics where 65VIN suffices and current monitoring is not required. |
Compared with LTC3310S and MAX20006, the LT7101EUHE#TRPBF uniquely combines 105V operation, integrated current programming/monitoring, and CISPR 25 compliance in a single 36-pin QFN - making it the only option for high-VIN, CC-capable, EMI-critical applications without external sensing circuitry.
Availability
LT7101EUHE#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and avionics remote power nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT7101EUHE#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 since 1965.
The LT7101EUHE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC regulators, designed specifically for ruggedized power conversion in harsh environments where wide input range, low EMI, and reliable current control are mandatory.
FAQ
What is the maximum input voltage rating for the LT7101EUHE#TRPBF?
The LT7101EUHE#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 96V industrial and transportation power buses without external pre-regulation. Operation above 105V is not recommended for sustained use, as it exceeds the specified operating range even though the absolute maximum is higher.
Does the LT7101EUHE#TRPBF require an external current-sense resistor?
No, the LT7101EUHE#TRPBF does not require an external current-sense resistor. It achieves accurate average output current programming and monitoring through its dedicated ICTRL and IMON pins, using internal MOSFET conduction sensing and reconstructed inductor current. This eliminates board space, power loss, and cost associated with external shunts while maintaining ±2% current accuracy across temperature.
How is EMI performance validated for the LT7101EUHE#TRPBF?
The LT7101EUHE#TRPBF's EMI performance is validated per CISPR 25 Class 5 radiated emissions limits using the standard test setup in Figure 17 of the datasheet (48VIN→5VOUT, 1A, 400kHz). It meets peak limits without additional filtering components, thanks to integrated Silent Switcher® techniques including symmetrical SW node layout, optimized gate drive timing, and controlled edge rates - confirmed in production testing across lot samples.
Can the LT7101EUHE#TRPBF operate with 100% duty cycle?
Yes, the LT7101EUHE#TRPBF supports true 100% duty cycle operation via an internal charge pump that sustains BOOST-SW voltage during continuous high-side conduction. This enables dropout-free regulation down to VOUT = VIN − 0.3V, critical for applications like backup power switchover or low-dropout post-regulation where input voltage may dip close to the desired output.
What output voltage options does the LT7101EUHE#TRPBF support?
The LT7101EUHE#TRPBF supports both fixed and adjustable output configurations. Eight pin-selectable fixed outputs (1.2V, 1.8V, 2.5V, 3.3V, 5V, 12V, and 15V) are enabled via VPRG1/VPRG2 strapping. Alternatively, floating both pins configures adjustable mode, allowing any output from 1V to VIN using an external resistor divider on the VFB pin referenced to the internal 1.000V bandgap.
LT7101EUHE#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)
LT7101EUHE#TRPBF FAQ
1.How can I place an order for LT7101EUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT7101EUHE#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 LT7101EUHE#TRPBF reliable?
The price and inventory of LT7101EUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT7101EUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT7101EUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT7101EUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT7101EUHE#TRPBF?
LT7101EUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT7101EUHE#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 LT7101EUHE#TRPBF?
For technical support, including LT7101EUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT7101EUHE#TRPBF requirements.
6.How does Aetrix verify that LT7101EUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT7101EUHE#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 LT7101EUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT7101EUHE#TRPBF?
All LT7101EUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT7101EUHE#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 LT7101EUHE#TRPBF part is unused and in its original packaging.
Return procedure for LT7101EUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT7101EUHE#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
