My Inquiry
My Account
Analog Devices Inc. LTC7103EUHE#TRPBF
- Part No.:
- LTC7103EUHE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103EUHE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,582
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7103EUHE#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter with average current mode control, operating from 4.4V to 105V input and delivering up to 2.3A output current at adjustable 1V–VIN output voltage. It features 40ns minimum on-time, 100% duty cycle capability, and integrated current programming/monitoring without external sense resistor - enabling high-ratio conversion in battery chargers, industrial power supplies, and avionics systems.
For engineers reviewing the LTC7103EUHE#TRPBF datasheet, LTC7103EUHE#TRPBF pinout, LTC7103EUHE#TRPBF application, or LTC7103EUHE#TRPBF equivalent, key selection criteria include ultralow EMI (CISPR25-compliant), programmable 200kHz–2MHz switching frequency, EXTVCC LDO support for 3.3V–40V auxiliary supply, and precise average current limit setting via ICTRL pin with ±5% accuracy over temperature.
Technical Context
The LTC7103EUHE#TRPBF implements constant-frequency average current mode control using internal reconstruction of inductor current via top/bottom switch sensing and RIND-based ramp synthesis - eliminating need for external current sense components while maintaining stability at ultra-low duty cycles. Its dual LDO architecture (VIN- and EXTVCC-powered INTVCC) enables efficient operation across wide input ranges and supports bootstrapped configurations.
It integrates fast-responding average current loop with OPTI-LOOP® compensation at ITH, selectable pulse-skipping or Burst Mode® for light-load efficiency optimization, and robust protection including input/output overvoltage, thermal shutdown, and brick-wall current limiting. PLL synchronization via PLLIN/MODE allows deterministic timing alignment with system clocks.
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. |
| Max Output Current | 2.3A continuous - sustained at full load with thermal derating per 38°C/W θJA in 5mm × 6mm QFN package. |
| Output Voltage Range | 1V to VIN - enables both low-voltage logic rails and high-voltage bias supplies from same IC. |
| Switching Frequency | 200kHz to 2MHz - programmable via FREQ pin resistor; enables compact magnetics and noise spectrum placement. |
| Quiescent Current | 2µA at 48VIN→3.3VOUT - ensures minimal standby power draw in always-on systems. |
| Min On-Time | 40ns - supports >100:1 step-down ratios (e.g., 100V→1V) while maintaining constant-frequency operation. |
| Current Sense Accuracy | ±5% average current limit error - enables precise CC/CV battery charging without external shunt calibration. |
| EMI Performance | CISPR25 Class 5 compliant - meets automotive radiated emission limits without added filtering in typical layouts. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37), rated for –40°C to 125°C junction temperature. Thermal performance requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable control input | Holding <1.1V disables regulator; <0.7V reduces IQ to 0.7µA - enables VIN undervoltage lockout via resistor divider. |
| VIN (30,31,32) | Main power input | Supplies high-side MOSFET drain and powers internal VIN LDO generating 3.5V INTVCC - decoupling required to PGND. |
| SW (24,25,26) | Power switch node | Connects internal top/bottom N-MOSFETs to external inductor - requires low-inductance layout and BOOST capacitor tie. |
| EXTVCC (20) | Auxiliary LDO input | Accepts 3.3V–40V supply to power INTVCC, bypassing VIN LDO - improves efficiency and reduces thermal stress at high VIN. |
| ICTRL (16) | Average current setpoint | 0.4V–1.3V input programs 0A–2.5A average output current - internal 20µA pull-up enables single-resistor programming. |
| IMON (17) | Current monitor output | 0.4V–1.3V analog voltage proportional to average output current (1V = 2.3A) - enables real-time telemetry without sense resistor. |
| FREQ (11) | Frequency programming | Sources 40µA; resistor to SGND sets fSW from 200kHz to 2MHz - critical for EMI tuning and inductor size optimization. |
| PLLIN/MODE (12) | Sync clock input / light-load mode select | Accepts external clock (200kHz–2MHz) for phase alignment; tied to SGND for Burst Mode®, to INTVCC via 100kΩ for pulse-skipping. |
| PGOOD (14) | Open-drain status flag | Asserts low when VFB deviates >10% from target - provides system-level power-good signaling with 24µs fault response. |
| PGND/Exposed Pad (35,36,37) | Power ground return | Primary thermal and electrical path for high-current switching loops - must be solidly connected to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI operation | CISPR25 Class 5 compliance achieved via Silent Switcher®-inspired layout, controlled edge rates, and integrated boost capacitor routing. |
| Accurate current programming | ICTRL pin sets average output current from 0A to 2.5A with ±5% tolerance over –40°C to 125°C - eliminates external sense resistor and amplifier. |
| 100% duty cycle capability | Internal charge pump maintains BOOST-SW voltage during continuous conduction - enables dropout-free operation down to VOUT ≈ VIN − 0.5V. |
| Programmable light-load mode | Selectable Burst Mode® (low ripple) or pulse-skipping (fast transient) via PLLIN/MODE pin - optimizes efficiency vs. noise vs. response trade-offs. |
| Robust protection suite | Includes input/output overvoltage lockout (OVLO/VFB(OV)), thermal shutdown, reverse-current prevention, and brick-wall current limiting. |
| Flexible compensation | OPTI-LOOP® at ITH pin enables external Type II/III compensation; tying ITH to INTVCC selects auto-tuned internal compensation. |
Applications
| Battery Charging Systems | Industrial Power Supplies |
|---|---|
|
Use Scenario: Constant-current/constant-voltage (CC/CV) charging of Li-ion, lead-acid, or supercapacitor banks from 24V–72V industrial buses. IC Role / Device Role / Timing Role: Primary regulating controller implementing programmable current limit, voltage regulation, and thermal foldback. Use Value: Eliminates external current-sense resistor and amplifier, reducing BOM cost and board area while maintaining ±5% current accuracy over temperature. |
Use Scenario: Point-of-load (POL) conversion in PLCs, motor drives, and process controllers requiring stable 3.3V/5V/12V rails from unregulated 48V backplanes. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator with integrated gate drivers and EXTVCC LDO for low-noise bias generation. Use Value: Delivers 2.3A at >90% efficiency across 4.4V–105V input range, with CISPR25 compliance enabling direct use in EMC-sensitive environments. |
| Avionics & Heavy Equipment | Medical Instrumentation |
|
Use Scenario: Power conversion in aircraft subsystems (e.g., flight control sensors, cockpit displays) fed from 28V or 115VAC-derived 270VDC bus. IC Role / Device Role / Timing Role: Wide-input DC/DC regulator supporting MIL-STD-704/DO-160 voltage transients and cold-cranking conditions. Use Value: Withstands 110V absolute max input and operates down to 4.4V, enabling reliable start-up after severe line dips without external supervision. |
Use Scenario: Isolated auxiliary power for imaging modules (ultrasound, MRI) requiring ultra-low noise, high-reliability 5V/3.3V rails. IC Role / Device Role / Timing Role: Low-EMI primary regulator feeding downstream isolated DC/DC converters or LDOs. Use Value: Burst Mode® operation achieves <10mVpp output ripple at light loads, while CISPR25 compliance simplifies medical EMC certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3310S | 4.5V–22V input, 10A output, 5mm × 6mm QFN, no EXTVCC LDO, lower VIN range | Better suited for high-current, low-VIN applications like server POL; lacks 105V rating and EXTVCC efficiency boost | Select LTC3310S only when input stays below 22V and >5A output is required - not a drop-in replacement for LTC7103EUHE#TRPBF. |
| MAX20008A | 3.5V–60V input, 2.5A output, 4mm × 4mm TQFN, integrated spread-spectrum, no current monitoring | Optimized for automotive infotainment with AEC-Q100 Grade 1; lacks ICTRL/IMON and 105V capability | Choose MAX20008A for automotive cabin applications needing spread-spectrum EMI reduction but not high-VIN or current telemetry. |
Compared with LTC3310S and MAX20008A, the LTC7103EUHE#TRPBF uniquely combines 105V operation, integrated current programming/monitoring, EXTVCC LDO efficiency enhancement, and CISPR25 compliance - making it the only option for high-reliability, high-VIN, current-controlled industrial and avionics power designs.
Availability
LTC7103EUHE#TRPBF is available at Aetrix Electronics and suitable for battery chargers, industrial power supplies, avionics systems, and medical instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC7103EUHE#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 LTC7103EUHE#TRPBF belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC regulators, designed specifically for rugged, wide-input industrial and transportation power systems where reliability, EMI control, and precision current regulation are critical.
FAQ
What is the maximum input voltage rating for the LTC7103EUHE#TRPBF?
The LTC7103EUHE#TRPBF has an absolute maximum input voltage rating of 110V, with guaranteed operation from 4.4V to 105V. This enables direct interface with 48V, 72V, and 100V industrial and transportation power buses without external pre-regulation stages. Operation above 105V is not specified and may compromise reliability or safety margins.
Does the LTC7103EUHE#TRPBF require an external current sense resistor?
No, the LTC7103EUHE#TRPBF does not require an external current sense resistor. It implements lossless average current sensing using internal top and bottom MOSFET conduction monitoring combined with RIND-based ramp synthesis. Current programming is set via the ICTRL pin voltage (0.4V–1.3V), and current monitoring is provided on the IMON pin (0.4V–1.3V), both with ±5% accuracy over temperature.
How is EMI performance achieved in the LTC7103EUHE#TRPBF without external filters?
The LTC7103EUHE#TRPBF achieves CISPR25 Class 5 radiated emission compliance through integrated layout techniques: symmetrical SW node routing, integrated bootstrap capacitor path, controlled switching edge rates, and optimized internal gate drive. These features reduce high-frequency common-mode noise at the source, minimizing need for ferrite beads or Y-capacitors in typical 2-layer PCB implementations.
Can the LTC7103EUHE#TRPBF operate with 100% duty cycle?
Yes, the LTC7103EUHE#TRPBF supports true 100% duty cycle operation via an internal charge pump that maintains BOOST-to-SW voltage even when the top MOSFET is continuously on. This enables dropout-free regulation down to VOUT ≈ VIN − 0.5V, critical for applications like cold-cranking in automotive systems or brownout recovery in industrial equipment.
What is the purpose of the EXTVCC pin on the LTC7103EUHE#TRPBF?
The EXTVCC pin on the LTC7103EUHE#TRPBF accepts an external 3.3V–40V supply to power the INTVCC rail, bypassing the internal VIN LDO. This reduces power dissipation and improves efficiency - especially at high VIN - by avoiding linear regulation losses. When used, EXTVCC must be tied to the regulated output (e.g., 5V or 12V) and the SS timeout feature must be disabled via 75kΩ resistor to INTVCC.
LTC7103EUHE#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:
- 2.3A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC7103EUHE#TRPBF FAQ
1.How can I place an order for LTC7103EUHE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103EUHE#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 LTC7103EUHE#TRPBF reliable?
The price and inventory of LTC7103EUHE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103EUHE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7103EUHE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103EUHE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103EUHE#TRPBF?
LTC7103EUHE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103EUHE#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 LTC7103EUHE#TRPBF?
For technical support, including LTC7103EUHE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103EUHE#TRPBF requirements.
6.How does Aetrix verify that LTC7103EUHE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7103EUHE#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 LTC7103EUHE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7103EUHE#TRPBF?
All LTC7103EUHE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103EUHE#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 LTC7103EUHE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7103EUHE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7103EUHE#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…
