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Analog Devices Inc. LTC3245HMSE#TRPBF
- Part No.:
- LTC3245HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245HMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,377
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Product details
Overview
LTC3245HMSE#TRPBF from Analog Devices is a wide-input (2.7V–38V), low-noise, 250mA switched-capacitor buck-boost DC/DC converter delivering regulated fixed 3.3V/5V or adjustable 2.5V–5V output. It uses fractional charge-pump conversion with automatic 2:1/1:1/1:2 mode switching, requires no inductors, and features pin-selectable Burst Mode® for efficiency optimization. It is AEC-Q100 qualified and used in automotive ECU/CAN transceiver supplies.
For engineers reviewing the LTC3245HMSE#TRPBF datasheet, LTC3245HMSE#TRPBF pinout, LTC3245HMSE#TRPBF application, or LTC3245HMSE#TRPBF equivalent, key selection considerations include its 150°C max junction temperature rating, thermally enhanced 12-lead MSOP package, multimode operation under wide VIN, and trade-off between low-noise constant-frequency vs. high-efficiency Burst Mode operation.
Technical Context
The LTC3245HMSE#TRPBF implements a constant-frequency switched-capacitor architecture with three automatic conversion modes: 2:1 step-down (VIN > 2×VOUT), 1:1 step-down (VOUT < VIN ≤ 2×VOUT), and 1:2 step-up (VIN < VOUT). Internal comparators with load-dependent hysteresis select the optimal ratio to maintain regulation across input and load variations.
Its control loop regulates output by adjusting per-cycle charge transfer onto the output capacitor, yielding lower ripple than conventional charge pumps. The PGOOD open-drain output asserts at 95% of final VOUT and deasserts at 91%, supporting system power sequencing. Soft-start limits inrush current over ~500μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 38V - supports direct connection to automotive battery (cold-crank down to 2.7V) and industrial 24V rails without pre-regulation. |
| VOUT Options | Fixed 3.3V, fixed 5V, or adjustable 2.5V–5V - selected via SEL1/SEL2 pins; enables single BOM for multiple voltage rails. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontroller housekeeping rails, and low-power sensors. |
| Quiescent Current | 18µA operating, 4µA shutdown - extends battery life in always-on automotive modules. |
| Operating Junction Temp | –40°C to 150°C - H-grade rating meets under-hood automotive thermal requirements. |
| Oscillator Frequency | 450kHz to 500kHz - constant frequency enables predictable EMI filtering and reduces input/output filter complexity. |
| Protection Features | Short-circuit and overtemperature protection - latches off during fault, auto-restarts after thermal recovery (~165°C). |
Pinout & Package
Package: 12-lead plastic MSOP with exposed thermal pad (Pin 13 = GND), θJA = 40°C/W, rated for –40°C to 150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,3) | Power Input | Three parallel inputs accept 2.7V–38V; must be shorted externally; low-impedance path for charge pump and internal circuitry. |
| BURST (Pin 4) | Mode Control Input | Logic high = low-noise constant-frequency operation; logic low = Burst Mode for higher light-load efficiency; 38V-tolerant, 1µA pull-down. |
| SEL1 / SEL2 (Pins 5,6) | Output Configuration Inputs | Set VOUT mode: both low = shutdown; SEL2=H/SEL1=L = 5V; both high = 3.3V; SEL2=L/SEL1=H = adjustable (ADJ = 1.2V reference). |
| OUTS/ADJ (Pin 7) | VOUT Sense / Feedback Input | Serves as output voltage sense (OUTS) for fixed outputs or ADJ node for resistor-divider programming; regulated to 1.200V ±2.4% in adjustable mode. |
| PGOOD (Pin 8) | Open-Drain Status Output | Asserts high-impedance when VOUT reaches ≥95% of target; deasserts at ≤91%; requires external pull-up for logic-level signaling. |
| C+ / C– (Pins 9,11) | Flying Capacitor Terminals | Connect external 1µF ceramic flying capacitor (CFLY); polarity-sensitive; defines charge transfer path for all conversion modes. |
| VOUT (Pin 10) | Regulated Output | Delivers up to 250mA; internally disconnects from VIN below UVLO (2.2V typ.) to prevent reverse leakage. |
| GND (Pins 12,13) | Ground Reference | Pins 12 and 13 (exposed pad) are common GND; exposed pad must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless Buck-Boost Architecture | Eliminates magnetic components, reducing board area, cost, and EMI concerns in space-constrained automotive modules. |
| Automatic Multimode Conversion | Seamlessly transitions among 2:1, 1:1, and 1:2 charge-pump ratios without external intervention, maintaining regulation across 2.7V–38V input. |
| Low-Noise Constant-Frequency Operation | 450–500kHz fixed switching minimizes spectral energy spread, easing compliance with automotive CISPR 25 Class 5 conducted emissions limits. |
| AEC-Q100 Qualified (H-Grade) | Rated for –40°C to 150°C junction operation with full characterization, enabling use in engine control units and transmission control modules. |
| Three-Capacitor Solution | Requires only one 1µF flying cap (CFLY), one 10µF low-ESR output cap (COUT), and one 1µF input cap (CIN) - simplifies BOM and layout. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller core, CAN transceiver, and sensor interface in engine control unit under cold-crank (2.7V) and load-dump (38V) conditions. IC Role / Device Role / Timing Role: Primary non-isolated buck-boost regulator providing stable 5V rail from varying battery voltage. Use Value: Maintains regulation without pre-regulator or inductor; 150°C rating survives under-hood thermal stress; PGOOD enables safe MCU boot sequencing. |
Use Scenario: Generates 3.3V housekeeping supply for PLC I/O modules and fieldbus gateways operating from 24V industrial bus. IC Role / Device Role / Timing Role: Secondary DC/DC converter replacing linear regulators to reduce heat dissipation in sealed enclosures. Use Value: 81% efficiency at 12V→5V/250mA eliminates need for heatsinking; low 18µA quiescent current supports low-power sleep states. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Converts 12V vehicle battery to clean 5V for USB peripherals or display backlight drivers in infotainment head units. IC Role / Device Role / Timing Role: Efficient intermediate voltage regulator with low output ripple in Burst Mode or constant-frequency mode. Use Value: 20mV typical ripple (COUT=10µF) in low-noise mode meets analog circuit noise floor; 50mV in Burst Mode trades ripple for >85% light-load efficiency. |
Use Scenario: Provides programmable 2.5V–5V bias for precision analog sensors (e.g., pressure, temperature) in automotive ADAS cameras. IC Role / Device Role / Timing Role: Adjustable output regulator using external resistor divider on OUTS/ADJ pin. Use Value: 1.200V ±2.4% reference enables accurate VOUT setting; 0.2mV/mA load regulation ensures stable sensor excitation across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17522GTE+ | Inductor-based synchronous buck-boost; 4.5V–60V input; 3.3V/5V fixed or adjustable; 350mA output; requires inductor and more external components. | Better suited for higher-current (>300mA) or higher-efficiency (>90%) applications where inductor size is acceptable. | Select MAX17522GTE+ when higher output current or tighter line/load regulation is required; avoid if inductor-free design is mandatory. |
| LTC3265EMSE#TRPBF | Low-noise inverting/boost charge pump; 4.5V–32V input; generates ±5V or ±12V; 100mA per rail; no positive buck-boost capability. | Designed for bipolar analog signal chains (e.g., op-amp supplies), not unipolar logic/system rails. | Select LTC3265EMSE#TRPBF only for dual-rail analog biasing; not a functional substitute for LTC3245HMSE#TRPBF's positive buck-boost function. |
Compared with MAX17522GTE+ and LTC3265EMSE#TRPBF, the LTC3245HMSE#TRPBF uniquely delivers inductorless positive buck-boost conversion with AEC-Q100 H-grade qualification, making it the only drop-in solution for space- and thermal-constrained automotive 5V/3.3V housekeeping rails requiring no magnetics.
Availability
LTC3245HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial housekeeping rails, and low-power 12V-to-5V conversion requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3245HMSE#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 LTC3245HMSE#TRPBF belongs to Analog Devices' Power by Linear™ family of highly integrated DC/DC converters, designed specifically for reliable, inductorless power conversion in harsh automotive and industrial environments.
FAQ
What is the maximum junction temperature rating for the LTC3245HMSE#TRPBF?
The LTC3245HMSE#TRPBF is an H-grade device rated for a maximum operating junction temperature of 150°C. This specification is guaranteed over the –40°C to 150°C junction temperature range and supports deployment in under-hood automotive locations where ambient temperatures exceed 105°C. Thermal derating applies above 150°C to preserve reliability.
How does the LTC3245HMSE#TRPBF select between 2:1, 1:1, and 1:2 charge-pump modes?
The LTC3245HMSE#TRPBF uses two internal comparators with load-dependent hysteresis to automatically select the optimal conversion ratio-2:1 for VIN > 2×VOUT, 1:1 for VOUT < VIN ≤ 2×VOUT, and 1:2 for VIN < VOUT. No external control is needed; the decision is made dynamically based on real-time VIN, VOUT, and load current to maximize efficiency while maintaining regulation.
Can the LTC3245HMSE#TRPBF generate an adjustable output voltage, and how is it configured?
Yes, the LTC3245HMSE#TRPBF supports adjustable output from 2.5V to 5V. To enable this, drive SEL2 low and SEL1 high, then connect the OUTS/ADJ pin to a resistor divider between VOUT and GND. The internal 1.200V reference sets VOUT = 1.2V × (1 + RA/RB). Select RB between 1kΩ and 1MΩ to balance accuracy and quiescent current.
What is the purpose of the PGOOD pin on the LTC3245HMSE#TRPBF, and how should it be used?
The PGOOD pin on the LTC3245HMSE#TRPBF is an open-drain output that signals valid regulation: it goes high-impedance when VOUT reaches ≥95% of its target and returns low-impedance when VOUT drops ≤91% due to overload or shutdown. It must be pulled up externally (e.g., to VOUT) with a resistor; adding an RC network allows programmable delay for power sequencing in complex systems.
Does the LTC3245HMSE#TRPBF require external compensation components?
No, the LTC3245HMSE#TRPBF is fully internally compensated. Its control loop stability relies solely on proper selection of the output capacitor (COUT ≥10µF, low-ESR ceramic) and flying capacitor (CFLY = 1µF ceramic). No external compensation resistors or capacitors are needed, simplifying design and reducing bill-of-materials count.
LTC3245HMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 2.5V (3.3V, 5V)
- Voltage - Output (Max):
- 5V
- Current - Output:
- 250mA
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3245HMSE#TRPBF FAQ
1.How can I place an order for LTC3245HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245HMSE#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 LTC3245HMSE#TRPBF reliable?
The price and inventory of LTC3245HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3245HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245HMSE#TRPBF?
LTC3245HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245HMSE#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 LTC3245HMSE#TRPBF?
For technical support, including LTC3245HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3245HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3245HMSE#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 LTC3245HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3245HMSE#TRPBF?
All LTC3245HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245HMSE#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 LTC3245HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3245HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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