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Analog Devices Inc. LTC3245IDE#PBF
- Part No.:
- LTC3245IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3245IDE#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 250MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:659
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Product details
Overview
LTC3245IDE#PBF from Analog Devices is a wide-input, low-noise, 250mA switched-capacitor buck-boost DC/DC converter delivering regulated 3.3V, 5V, or adjustable (2.5V–5V) output from 2.7V to 38V input. 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 LTC3245IDE#PBF datasheet, LTC3245IDE#PBF pinout, LTC3245IDE#PBF application, or LTC3245IDE#PBF equivalent, key selection criteria include its 2.7V–38V input range, 12-pin DFN package with exposed thermal pad, multimode operation with automatic ratio selection, 18µA quiescent current, and PGOOD monitoring capability for power sequencing in space-constrained industrial and automotive systems.
Technical Context
The LTC3245IDE#PBF implements a constant-frequency switched-capacitor architecture with three operating modes-2:1 step-down (VIN > 2×VOUT), 1:1 step-down (VOUT < VIN ≤ 2×VOUT), and 1:2 step-up (VIN < VOUT)-selected automatically based on real-time VIN, VOUT, and load conditions. Internal comparators with load-dependent hysteresis ensure stable transitions between modes while maintaining regulation.
It integrates soft-start (500µs), overtemperature shutdown (175°C trip, 165°C restart), short-circuit current limiting (~900mA), and open-drain PGOOD with 95% rising / 91% falling thresholds. The OUTS/ADJ pin serves dual function: output sensing for fixed outputs or feedback reference (1.200V ±24mV) for adjustable configurations using external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 38V - supports direct connection to automotive battery (cold crank to load dump) and industrial 24V rails without pre-regulation. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in housekeeping supplies. |
| Quiescent Current | 18µA typical - enables always-on functionality in low-power wake-up circuits without excessive battery drain. |
| Output Accuracy | ±4% over temp and line - ensures reliable logic-level compliance for 3.3V/5V digital subsystems across automotive temperature range. |
| Oscillator Frequency | 450kHz to 500kHz - fixed-frequency operation minimizes EMI and simplifies input/output filtering vs variable-frequency charge pumps. |
| Thermal Rating | –40°C to 125°C junction - validated for under-hood automotive environments per AEC-Q100 Grade I. |
| Protection Features | Short-circuit, overtemperature, UVLO - eliminates need for external fault management circuitry in safety-critical applications. |
Pinout & Package
The LTC3245IDE#PBF is housed in a thermally enhanced 12-pin (3mm × 4mm) plastic DFN package with exposed GND pad (Pin 13) requiring soldering to PCB ground plane for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 2, 3) | Power Input | Three parallel inputs accept 2.7V–38V; must be tied together externally to minimize impedance and support high-current paths. |
| BURST (Pin 4) | Mode Control | Logic high enables low-noise constant-frequency operation; logic low activates Burst Mode® for <18µA IQ at light loads. |
| SEL1 / SEL2 (Pins 5, 6) | Output Configuration | Two-pin encoding selects fixed 5V (SEL2=HI, SEL1=LO), fixed 3.3V (both HI), adjustable (SEL2=LO, SEL1=HI), or shutdown (both LO). |
| OUTS/ADJ (Pin 7) | Feedback Node | Serves as output sense for fixed voltages or 1.200V reference for adjustable outputs via external resistor divider. |
| PGOOD (Pin 8) | Power Status Monitor | Open-drain output signals valid regulation when VOUT reaches ≥95% of target; pulls low during UVLO or overload. |
| C+ / C– (Pins 9, 11) | Flying Capacitor Interface | Connects external 1µF ceramic flying capacitor; polarity-sensitive terminals define charge transfer path in all three 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) | Reference & Thermal Path | Pins 12 and 13 (exposed pad) are both GND; pad must be soldered to PCB ground plane for thermal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in compact automotive modules. |
| Automatic multimode switching | Maintains >81% efficiency across 12V→5V conversion while adapting seamlessly between 2:1, 1:1, and 1:2 charge-pump ratios. |
| Low-noise constant frequency | 450–500kHz operation with <20mVpp ripple (COUT=10µF) meets stringent analog supply requirements in sensor signal chains. |
| AEC-Q100 qualification | Validated for automotive Grade I (–40°C to +125°C) operation, including reliability testing for humidity, temperature cycling, and vibration. |
| Integrated protection | Self-contained short-circuit current limit and thermal shutdown enable robust deployment without external supervision circuitry. |
Applications
| Automotive ECU Housekeeping Supply | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and EEPROM in engine control unit under varying battery conditions (6V cold crank to 36V load dump). IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator providing stable 5V rail from raw battery input; manages mode transitions autonomously during voltage transients. Use Value: Eliminates need for pre-regulator + LDO cascade, reducing component count by ≥4 parts while maintaining 95% PGOOD assertion across full automotive temperature range. | Use Scenario: Supplies 3.3V to low-power wireless sensor node (MCU + RF transceiver + analog front-end) in factory automation environment. IC Role / Device Role / Timing Role: Central power management IC enabling always-on wake-up capability with 18µA quiescent current and fast startup (<1ms). Use Value: Extends battery life beyond 10 years in energy-harvesting deployments by minimizing no-load consumption and supporting programmable output voltage for optimal MCU core voltage scaling. |
| 12V-to-5V Industrial Conversion | Rail Translation for Legacy Interface |
Use Scenario: Converts 12V industrial bus to clean 5V for USB peripherals, optocouplers, and level-shifting logic in PLC backplane modules. IC Role / Device Role / Timing Role: High-efficiency buck-boost regulator replacing inefficient linear regulators or bulky inductor-based solutions in convection-cooled enclosures. Use Value: Achieves 81% efficiency at 250mA load with <50mVpp output ripple, reducing thermal stress and enabling fanless operation in sealed IP65-rated housings. | Use Scenario: Generates 3.3V from 5V or 24V supply to interface legacy 5V logic with modern 3.3V FPGAs or ADCs in test equipment. IC Role / Device Role / Timing Role: Programmable voltage translator supporting multiple I/O standards (TTL, LVCMOS, RS-485 bias) within single footprint. Use Value: Enables flexible board reuse across product variants via simple SEL pin strapping-no PCB redesign required when changing interface voltage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3265IDE#PBF | Includes integrated low-noise LDO post-regulator; higher IQ (65µA); fixed 3.3V/5V only; no adjustable option. | Better suited for noise-sensitive analog supplies (e.g., precision ADC references) where ultra-low ripple is critical. | Select LTC3265IDE#PBF when combined charge-pump + LDO performance justifies higher quiescent current and cost premium. |
| MAX17523ATP+T | Inductor-based synchronous buck-boost; wider 4.5V–60V input; higher 500mA output; requires external inductor and compensation. | Preferred for higher-power applications (>300mA) or where strict EMI compliance mandates spread-spectrum control. | Choose MAX17523ATP+T when system-level efficiency above 90% at >300mA or regulatory EMI limits require inductor-based topology. |
Compared with LTC3265IDE#PBF, the LTC3245IDE#PBF offers lower quiescent current and adjustable output flexibility but lacks post-regulation filtering; versus MAX17523ATP+T, it trades higher peak efficiency for smaller size, lower EMI, and zero-inductor simplicity in sub-300mA applications.
Availability
LTC3245IDE#PBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial sensor node designs, and 12V-to-5V conversion applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3245IDE#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 healthcare markets with precision power, signal chain, and RF solutions.
The LTC3245IDE#PBF belongs to Analog Devices' µModule®-adjacent switched-capacitor regulator family, designed specifically for space-constrained, high-reliability automotive and industrial applications where inductor-free, wide-input, and AEC-Q100-compliant power conversion is essential.
FAQ
What input voltage range does the LTC3245IDE#PBF support?
The LTC3245IDE#PBF supports an input voltage range of 2.7V to 38V, enabling direct connection to automotive batteries (including cold-crank and load-dump conditions) and standard industrial 24V rails. Its undervoltage lockout triggers at 2.2V (falling) and 2.4V (rising), ensuring reliable startup and brownout protection. This wide range eliminates the need for upstream pre-regulators in most embedded systems.
How does the LTC3245IDE#PBF select between buck, buck-boost, and boost modes?
The LTC3245IDE#PBF automatically selects between 2:1 step-down, 1:1 step-down, and 1:2 step-up modes using internal comparators that monitor VIN relative to VOUT and load current. No external control is needed-the device transitions seamlessly between modes to maintain regulation and optimize efficiency across the full input range. Mode selection is transparent to the user and occurs without output disruption.
Can the LTC3245IDE#PBF generate an adjustable output voltage?
Yes, the LTC3245IDE#PBF supports adjustable output from 2.5V to 5V using the OUTS/ADJ pin as a 1.200V reference. Configure with an external resistor divider (RA/RB) where RA/RB = (VOUT/1.2V) – 1. Set SEL1 = high and SEL2 = low to enable adjustable mode. This flexibility allows precise matching to MCU core voltages or custom logic levels without requiring multiple fixed-output SKUs.
What is the purpose of the PGOOD pin on the LTC3245IDE#PBF?
The PGOOD pin on the LTC3245IDE#PBF is an open-drain output that signals valid regulation: it goes high-impedance when VOUT reaches ≥95% of its target voltage and returns low when VOUT drops below ~91% due to overload or shutdown. Used with an external pull-up resistor (e.g., to VOUT), it enables safe power sequencing in multi-rail systems and provides fault indication for host microcontrollers without additional monitoring circuitry.
Is the LTC3245IDE#PBF suitable for automotive applications?
Yes, the LTC3245IDE#PBF is AEC-Q100 qualified for automotive Grade I (–40°C to +125°C junction temperature) and packaged in a thermally enhanced 12-pin DFN with exposed GND pad. It includes automotive-grade reliability testing for temperature cycling, humidity, and mechanical shock. Its wide 2.7V–38V input range, integrated protections, and low 18µA quiescent current make it ideal for ECU, body control module, and ADAS housekeeping supplies.
LTC3245IDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3245IDE#PBF FAQ
1.How can I place an order for LTC3245IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245IDE#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 LTC3245IDE#PBF reliable?
The price and inventory of LTC3245IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3245IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245IDE#PBF?
LTC3245IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245IDE#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 LTC3245IDE#PBF?
For technical support, including LTC3245IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245IDE#PBF requirements.
6.How does Aetrix verify that LTC3245IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3245IDE#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 LTC3245IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3245IDE#PBF?
All LTC3245IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245IDE#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 LTC3245IDE#PBF part is unused and in its original packaging.
Return procedure for LTC3245IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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