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Analog Devices Inc. LTC7103MPUHE#PBF
- Part No.:
- LTC7103MPUHE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-WFQFN, 26 Leads, Exposed Pad
- Datasheet:
-
LTC7103MPUHE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2.3A 36QFN
- Quantity:
- Payment:
- Shipping:
Inventory:648
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Product details
Overview
LTC7103MPUHE#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 1V to VIN adjustable output, achieves 40ns minimum on-time and 100% duty cycle, and targets high-reliability automotive, military, and industrial power systems requiring wide-input, low-EMI, and precise current regulation.
For engineers reviewing the LTC7103MPUHE#PBF datasheet, LTC7103MPUHE#PBF pinout, LTC7103MPUHE#PBF application, or LTC7103MPUHE#PBF equivalent, key selection criteria include its –55°C to 150°C operating junction temperature, CISPR25-compliant radiated EMI performance, no external RSENSE current monitoring, programmable 200kHz–2MHz switching frequency, and EXTVCC LDO support for 3.3V–40V auxiliary supply.
Technical Context
The LTC7103MPUHE#PBF implements constant-frequency average current mode control using internal top/bottom MOSFET current sensing and lossless inductor current reconstruction via RIND-based ramp generation. Its architecture enables fast transient response, accurate CC/CV operation, and stable regulation at ultra-low duty cycles without external sense resistors.
It integrates dual LDOs (VIN-powered and EXTVCC-powered), OPTI-LOOP® or fixed internal compensation, PLL synchronization capability, and comprehensive protection including input/output overvoltage, thermal shutdown, and brick-wall current limiting. The device supports both Burst Mode® and pulse-skipping light-load operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4V to 105V - supports direct connection to 48V, 72V, and 100V industrial/military bus rails without pre-regulation. |
| Output Current | Up to 2.3A - sustained delivery with integrated 265mΩ/142mΩ MOSFETs and thermally enhanced 5mm × 6mm QFN package. |
| Switching Frequency | 200kHz to 2MHz - programmable via resistor or external clock; enables optimization of size, efficiency, and EMI. |
| Min On-Time | 40ns - allows high step-down ratios (e.g., 100V→3.3V) while maintaining constant-frequency operation. |
| Quiescent Current | 2µA at 48VIN→3.3VOUT - enables always-on operation in battery-backed or energy-sensitive systems. |
| Operating Temp | –55°C to 150°C - qualified for extended-range military and aerospace applications per MP grade testing. |
| EMI Compliance | CISPR25 Class 5 peak limits - verified radiated emission performance without added filtering in typical layouts. |
Pinout & Package
Package: 36-lead (5mm × 6mm) plastic QFN with exposed PGND pad (Pin 37), rated θJA = 38°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (3) | Enable control input | Holding <1.1V disables regulator; <0.7V reduces IQ to ~0.7µA - enables precise undervoltage lockout via resistor divider from VIN. |
| VIN (30,31,32) | Main power input | Supplies high-side MOSFET drain and powers INTVCC LDO - requires local ceramic decoupling to PGND. |
| SW (24,25,26) | Power switch node | Connects internal MOSFETs to external inductor - high di/dt path requiring tight layout and Kelvin grounding. |
| EXTVCC (20) | Auxiliary LDO input | Accepts 3.3V–40V to power INTVCC, bypassing VIN LDO - improves efficiency and reduces thermal stress at high VIN. |
| ICTRL (16) | Current setpoint input | 0.4V–1.3V programming voltage sets average output current from 0A to 2.5A - enables CC/CV battery charging without external sense resistor. |
| IMON (17) | Current monitor output | 0.4V–1.3V analog voltage proportional to average output current (0A–2.5A) - provides real-time load telemetry for system monitoring. |
| FREQ (11) | Frequency control | Sources 40µA; resistor-to-SGND sets fSW from 200kHz to 2MHz - fine-tunes trade-off between size, efficiency, and EMI. |
| PLLIN/MODE (12) | Sync & light-load mode | Accepts external clock for phase synchronization; floating or SGND selects Burst Mode®, INTVCC via 100k selects pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| No external RSENSE current sensing | Internal average current monitoring with ±3% accuracy across –55°C to 150°C eliminates sense resistor, board space, and power loss. |
| Brick-wall current limit | Hard current limit with fast response prevents overcurrent damage during short-circuit or overload - no foldback or hiccup required. |
| 100% duty cycle operation | Charge pump maintains BOOST voltage during continuous conduction - enables dropout-free operation down to VOUT ≈ VIN – 0.5V. |
| OPTI-LOOP® compensation | External ITH compensation allows loop tuning optimized for specific output capacitor ESR and load dynamics - improves stability margins. |
| Programmable fixed output voltages | Eight factory-set outputs (1.2V–15V) selected via VPRG1/VPRG2 pins - eliminates feedback divider for common rail applications. |
Applications
| Battery Chargers and CC/CV Supplies | Automotive and Military Systems |
|---|---|
|
Use Scenario: 48V lithium-ion battery charger with constant-current/constant-voltage profile and thermal derating. IC Role / Device Role / Timing Role: Primary buck controller providing regulated output and precise average current programming via ICTRL pin. Use Value: Eliminates external current-sense resistor and amplifier, reducing BOM cost and PCB area while maintaining ±3% current accuracy over full temperature range. |
Use Scenario: Power supply for engine control unit (ECU) in commercial vehicle with 24V/48V dual-rail compatibility and cold-crank immunity. IC Role / Device Role / Timing Role: High-input buck regulator delivering 3.3V/5V with UVLO hysteresis, OVLO shutdown, and 150°C junction rating. Use Value: Withstands 105V load-dump transients and operates continuously at –40°C to +125°C ambient, meeting ISO 16750-2 requirements. |
| Industrial, Avionics and Heavy Equipment | Medical Instruments and Telecommunication Systems |
|
Use Scenario: 100V DC distribution rail powering isolated DC/DC modules in factory automation PLCs. IC Role / Device Role / Timing Role: Intermediate bus converter stepping 100V down to 12V with low EMI and high efficiency at partial load. Use Value: CISPR25 Class 5 compliance achieved without ferrite beads or shielding, simplifying EMC validation for industrial certifications. |
Use Scenario: Point-of-load supply for FPGA or ADC in portable ultrasound equipment requiring low noise and standby current <5µA. IC Role / Device Role / Timing Role: Efficient, low-quiescent buck regulator enabling battery-operated runtime extension and clean analog supply. Use Value: 2µA IQ at 48VIN→3.3VOUT and selectable Burst Mode® reduce no-load power dissipation by >90% versus standard PWM. |
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 |
|---|---|---|---|
| LTC3891EMPU#PBF | 60V max VIN, 8A output, no integrated MOSFETs - requires external FETs and current sense resistor. | Targeted at higher-current, lower-input designs where discrete FET selection is preferred. | Select when >2.3A output or discrete FET optimization is required; not drop-in for LTC7103MPUHE#PBF's 105V/2.3A integrated solution. |
| LM5164QPWPRQ1 | 100V max VIN, 350mA output, no current monitoring - lacks ICTRL/IMON, average current mode, or EXTVCC LDO. | Suitable for low-power auxiliary rails where precision current control is unnecessary. | Choose only for cost-sensitive, low-current applications without CC/CV or telemetry needs - not functionally equivalent. |
Compared with LTC3891EMPU#PBF and LM5164QPWPRQ1, the LTC7103MPUHE#PBF uniquely combines 105V operation, integrated 2.3A power stage, no-RSENSE current programming/monitoring, and –55°C to 150°C qualification - making it the sole option for compact, high-reliability, wide-temp CC/CV conversion in harsh environments.
Availability
LTC7103MPUHE#PBF is available at Aetrix Electronics and suitable for battery chargers, automotive ECUs, industrial PLCs, and avionics power supplies requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for LTC7103MPUHE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and defense markets with precision power, signal chain, and RF solutions.
The LTC7103MPUHE#PBF belongs to Analog Devices' Power by Linear™ family of high-voltage monolithic DC/DC regulators, engineered specifically for ruggedized power conversion in automotive, military, and industrial applications demanding wide VIN, low EMI, and extended temperature operation.
FAQ
What is the maximum input voltage rating for the LTC7103MPUHE#PBF?
The LTC7103MPUHE#PBF has an absolute maximum input voltage rating of 110V, with guaranteed operation up to 105V across its full –55°C to 150°C junction temperature range. This enables direct interface with 48V, 72V, and 100V industrial and transportation bus systems without external clamping or pre-regulation stages.
Does the LTC7103MPUHE#PBF require an external current sense resistor?
No, the LTC7103MPUHE#PBF does not require an external current sense resistor. It implements lossless average output current sensing and monitoring using internal MOSFET RDS(ON) measurement and inductor current reconstruction. Current programming (ICTRL) and monitoring (IMON) are fully integrated, delivering ±3% accuracy over temperature without added components.
How does the EXTVCC pin improve efficiency in the LTC7103MPUHE#PBF?
The EXTVCC pin on the LTC7103MPUHE#PBF powers an internal LDO that generates INTVCC, bypassing the higher-loss VIN-based LDO when EXTVCC is between 3.1V and 40V. This reduces power dissipation in the IC, especially at high input voltages like 72V or 100V, improving full-load efficiency by up to 2% and lowering die temperature under continuous operation.
What is the purpose of the RIND pin on the LTC7103MPUHE#PBF?
The RIND pin on the LTC7103MPUHE#PBF sets the internal ramp current used to reconstruct the inductor current waveform for average current mode control at low duty cycles. A resistor from RIND to SGND equal to 1/(7.5·L) calibrates this ramp, ensuring accurate current loop stability and transient response - critical for reliable operation below 5% duty cycle (e.g., 100V→3.3V).
Can the LTC7103MPUHE#PBF synchronize to an external clock?
Yes, the LTC7103MPUHE#PBF can synchronize to an external clock via the PLLIN/MODE pin. When an external clock is applied, the internal phase-locked loop aligns the rising edge of the SW signal to the external clock edge, enabling deterministic timing for multi-phase or noise-sensitive systems. Synchronization supports frequencies from 200kHz to 2MHz and maintains pulse-skipping operation.
LTC7103MPUHE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-QFN (5x6)
LTC7103MPUHE#PBF FAQ
1.How can I place an order for LTC7103MPUHE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7103MPUHE#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 LTC7103MPUHE#PBF reliable?
The price and inventory of LTC7103MPUHE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7103MPUHE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7103MPUHE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7103MPUHE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7103MPUHE#PBF?
LTC7103MPUHE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7103MPUHE#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 LTC7103MPUHE#PBF?
For technical support, including LTC7103MPUHE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7103MPUHE#PBF requirements.
6.How does Aetrix verify that LTC7103MPUHE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7103MPUHE#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 LTC7103MPUHE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7103MPUHE#PBF?
All LTC7103MPUHE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7103MPUHE#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 LTC7103MPUHE#PBF part is unused and in its original packaging.
Return procedure for LTC7103MPUHE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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