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Analog Devices Inc. LTC7103EUHE#PBF
- Part No.:
- LTC7103EUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103EUHE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,502
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Product details
Overview
LTC7103EUHE#PBF from Analog Devices is a 105V, 2.3A monolithic synchronous step-down DC/DC regulator with average current mode control. It operates from 4.4V to 105V input, delivers adjustable 1V–VIN output, achieves 40ns minimum on-time and 2µA quiescent current at 48VIN/3.3VOUT, and supports CISPR25-compliant low-EMI operation in automotive battery supply systems.
For engineers reviewing the LTC7103EUHE#PBF datasheet, LTC7103EUHE#PBF pinout, LTC7103EUHE#PBF application, or LTC7103EUHE#PBF equivalent, key selection criteria include input voltage range (4.4–105V), programmable current limit (0–2.5A), fixed/flexible frequency (200kHz–2MHz), EXTVCC LDO support (3.3–40V), and thermal performance in the 5mm × 6mm QFN package.
Technical Context
The LTC7103EUHE#PBF implements constant-frequency average current mode control using internal top/bottom MOSFET current sensing and lossless inductor current reconstruction-enabling precise current programming without external RSENSE. Its architecture integrates OPTI-LOOP® compensation, PLL synchronization, and dual LDO biasing (VIN- and EXTVCC-powered INTVCC) for high-step-down-ratio stability.
It features brick-wall average current limiting (2.25–2.75A), fast current monitor (IMON output scaling 0.4–1.3V per 0–2.5A), 100% duty cycle capability via charge-pump boosted gate drive, and selectable light-load modes (Burst Mode® or pulse-skipping) with programmable frequency and external clock sync.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports wide-range industrial and automotive battery inputs including 48V, 72V, and 96V nominal systems. |
| Output Current | Up to 2.3A continuous - rated for sustained load delivery with thermal derating above 125°C junction temperature. |
| Quiescent Current | 2µA in regulation at 48VIN/3.3VOUT - enables always-on operation in low-power telemetry and battery-backed subsystems. |
| Switching Frequency | 200kHz to 2MHz, programmable via resistor or PLL sync - allows optimization of inductor size, EMI profile, and transient response. |
| Minimum On-Time | 40ns - enables stable 3.3V/5V output from 72V+ inputs at high switching frequencies without pulse skipping. |
| Current Sensing | No external sense resistor required - average current programmed via ICTRL (0.4–1.3V → 0–2.5A) and monitored on IMON (0.4–1.3V). |
| Package | 36-lead 5mm × 6mm QFN with exposed PGND pad - thermally enhanced for ≤38°C/W θJA with proper PCB copper area. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed thermal pad (Pin 37 = PGND). Requires soldering of exposed pad to PCB ground plane for rated electrical and thermal performance (TJMAX = 150°C, θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable control input | Holding <1.1V disables regulator; <0.7V reduces IQ to ~0.7µA; used for VIN undervoltage lockout via resistor divider. |
| VIN (30,31,32) | Main power input | Supplies high-side MOSFET drain and VIN LDO; decoupled to PGND; absolute max 110V. |
| SW (24,25,26) | Power switch node | Connects internal MOSFETs to external inductor; requires low-ESR ceramic bootstrap capacitor to BOOST. |
| EXTVCC (20) | External bias input | Enables INTVCC generation from VOUT (3.3–40V), bypassing VIN LDO to improve efficiency and reduce thermal stress. |
| ICTRL (16) | Average current programming | Voltage input (0.4–1.3V) sets average output current limit (0–2.5A); internal 20µA pull-up enables single-resistor programming. |
| IMON (17) | Current monitor output | Analog voltage (0.4–1.3V) proportional to average output current (0–2.5A); used for system-level current telemetry or protection. |
| FREQ (11) | Frequency control | Sets switching frequency from 200kHz–2MHz via resistor-to-SGND; sources 40µA; minimized capacitance required for Burst Mode. |
| PLLIN/MODE (12) | Sync and light-load mode select | Accepts external clock (200kHz–2MHz) for phase alignment; selects Burst Mode (float/SGND) or pulse-skipping (100kΩ to INTVCC). |
| PGND/Exposed Pad (35,36,37) | Power ground return | Primary thermal and electrical ground path; exposed pad must be soldered to PCB ground plane for full spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI/EMC emissions | CISPR25 Class 5 radiated emission compliant - achieved via controlled slew rates, integrated boot diode, and optimized layout-aware pinout. |
| Accurate current programming & monitoring | 0.5% typical current limit accuracy and ±1% IMON linearity - eliminates need for external sense resistor and amplifier in CC/CV applications. |
| 100% duty cycle operation | Enabled by internal charge pump maintaining BOOST-SW voltage - supports dropout-limited operation down to VOUT ≈ VIN – 0.5V. |
| Programmable fixed-frequency or PLL sync | 200kHz–2MHz range with ±15% accuracy; external clock sync preserves timing integrity in multi-regulator systems. |
| OPTI-LOOP® or fixed internal compensation | ITH pin supports external Type II/III compensation or tie-to-INTVCC for auto-tuned internal loop - simplifies stability design across wide VIN/VOUT ranges. |
| Input/output overvoltage protection | OVLO pin shuts down regulator if VIN exceeds 1.21V threshold; VFB OVP trips at +7% to +13% deviation - protects downstream loads. |
Applications
| Battery Chargers and CC/CV Supplies | Automotive and Military Systems |
|---|---|
Use Scenario: Constant-current charging of LiFePO4 or lead-acid batteries from 24V–72V vehicle bus. IC Role / Device Role / Timing Role: Primary buck regulator with programmable current limit and real-time IMON feedback for closed-loop CC control. Use Value: Eliminates external current-sense resistor and amplifier, reducing BOM cost and board space while maintaining ±1% current accuracy. |
Use Scenario: Power conversion for infotainment head units or radar modules operating from 12V/24V/48V automotive battery rails. IC Role / Device Role / Timing Role: High-input-voltage DC/DC converter with CISPR25-compliant EMI and 150°C junction rating for under-hood deployment. Use Value: Meets stringent automotive EMC requirements without added filtering, and sustains operation at elevated ambient temperatures. |
| Industrial, Avionics and Heavy Equipment | Medical Instruments and Telecommunication Systems |
Use Scenario: 48V-to-5V/3.3V conversion for PLC I/O modules or motor drive logic supplies in factory automation. IC Role / Device Role / Timing Role: Wide-input buck regulator with EXTVCC LDO support enabling efficient bootstrapped operation from regulated 5V rail. Use Value: Reduces power dissipation in VIN LDO by >60% versus VIN-only biasing, lowering thermal load on PCB and improving system MTBF. |
Use Scenario: Point-of-load regulation for FPGA or DSP cores in portable diagnostic equipment powered from 48V telecom rectifiers. IC Role / Device Role / Timing Role: Synchronous buck controller with 40ns min-on-time and programmable frequency to meet tight transient response specs. Use Value: Enables use of small 18µH inductors at 1MHz, shrinking solution size by 35% vs legacy 300kHz designs while maintaining <1% output ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8640S | 60V max input, 4A output, Silent Switcher® architecture, lower IQ (2.5µA), no EXTVCC LDO or average current mode. | Preferred for sub-60V applications requiring ultra-low EMI; lacks programmable current limit and IMON output. | Select LT8640S when EMI is paramount and input stays below 60V; LTC7103EUHE#PBF remains superior for >60V inputs and CC/CV functionality. |
| LM5164 | 100V max input, 350mA output, peak current mode, no IMON, no EXTVCC, smaller 10-pin WSON package. | Suitable for low-power auxiliary rails; cannot replace LTC7103EUHE#PBF in 2.3A main supply roles. | Choose LM5164 only for <0.5A loads where footprint and cost outweigh current monitoring needs; LTC7103EUHE#PBF is required for >1A CC/CV or telemetry. |
Compared with LT8640S and LM5164, the LTC7103EUHE#PBF uniquely combines 105V input rating, 2.3A output, average current mode control, and integrated current monitor-making it the only drop-in solution for high-reliability 48V–72V battery-powered systems requiring programmable current limiting and real-time telemetry.
Availability
LTC7103EUHE#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial 48V power distribution, and avionics DC/DC conversion requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC7103EUHE#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 precision instrumentation, communications, and power management markets.
The LTC7103EUHE#PBF belongs to Analog Devices' Power by Linear™ high-voltage DC/DC regulator family, designed specifically for robust, low-EMI power conversion in automotive, industrial, and military applications with wide input voltage ranges.
FAQ
What is the maximum input voltage rating for the LTC7103EUHE#PBF?
The LTC7103EUHE#PBF has an absolute maximum input voltage rating of 110V, with guaranteed operation up to 105V across its –40°C to 125°C junction temperature range. This makes the LTC7103EUHE#PBF suitable for 72V and 96V nominal battery systems common in heavy-duty vehicles and industrial equipment.
Does the LTC7103EUHE#PBF require an external current sense resistor?
No, the LTC7103EUHE#PBF does not require an external current sense resistor. It uses internal MOSFET current sensing and inductor current reconstruction to enable accurate average current programming via the ICTRL pin and monitoring via the IMON pin - a core feature confirmed in the datasheet's "Fast and Accurate Output Current Programming and Monitoring with No External RSENSE" specification.
How is the output voltage configured on the LTC7103EUHE#PBF?
The LTC7103EUHE#PBF supports both adjustable and fixed-output configurations. For adjustable output, connect a resistor divider from VOUT to VFB (pin 10) to set VOUT = 1V × (1 + R1/R2). For fixed output, program VPRG1 and VPRG2 (pins 18,19) to SGND or INTVCC to select one of eight preset voltages (1.2V–15V), as detailed in the "Output Voltage Programming" section of the datasheet.
What thermal considerations apply to the LTC7103EUHE#PBF in continuous 2.3A operation?
In continuous 2.3A operation, the LTC7103EUHE#PBF requires adequate PCB copper area under the exposed PGND pad (pin 37) to maintain junction temperature ≤125°C. With θJA = 38°C/W and typical power dissipation of ~1.2W at 48VIN/5VOUT, ≥4 cm² of 2-oz copper connected to the pad is recommended. The LTC7103EUHE#PBF's thermal shutdown activates above 150°C but is not production tested.
Can the LTC7103EUHE#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC7103EUHE#PBF supports external clock synchronization via the PLLIN/MODE pin (pin 12). It accepts external clocks from 200kHz to 2MHz, locking the rising edge of the SW signal to the external clock's rising edge. This capability is explicitly documented in the "Synchronizable Frequency" electrical characteristic table and functional diagram.
LTC7103EUHE#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:
- 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#PBF FAQ
1.How can I place an order for LTC7103EUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103EUHE#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 LTC7103EUHE#PBF reliable?
The price and inventory of LTC7103EUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103EUHE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7103EUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103EUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103EUHE#PBF?
LTC7103EUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103EUHE#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 LTC7103EUHE#PBF?
For technical support, including LTC7103EUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103EUHE#PBF requirements.
6.How does Aetrix verify that LTC7103EUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7103EUHE#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 LTC7103EUHE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7103EUHE#PBF?
All LTC7103EUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103EUHE#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 LTC7103EUHE#PBF part is unused and in its original packaging.
Return procedure for LTC7103EUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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