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Analog Devices Inc. LTC3245IMSE#PBF
- Part No.:
- LTC3245IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245IMSE#PBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,744
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Product details
Overview
LTC3245IMSE#PBF 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 LTC3245IMSE#PBF datasheet, LTC3245IMSE#PBF pinout, LTC3245IMSE#PBF application, or LTC3245IMSE#PBF equivalent, key selection considerations include input voltage range (2.7V–38V), output current capability (250mA), thermal performance (–40°C to 125°C junction), package type (12-lead MSOP), and mode configuration via SEL1/SEL2/BURST pins.
Technical Context
The LTC3245IMSE#PBF 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). Regulation is achieved by dynamically adjusting charge transfer per cycle based on sensed output voltage and load current.
Internal comparators with load-proportional hysteresis determine mode transitions to maximize efficiency across varying VIN and IOUT conditions. The device integrates soft-start, overtemperature shutdown (175°C trip), short-circuit current limiting (~900mA), and open-drain PGOOD with 95% rising/91% falling thresholds referenced to final regulation voltage.
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. |
| VOUT Options | Fixed 3.3V, fixed 5V, or adjustable 2.5V–5V - selected via SEL1/SEL2 logic; ADJ pin regulates to 1.200V reference for precision feedback. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontroller housekeeping rails, or small logic loads. |
| Quiescent Current | 18µA operating, 4µA shutdown - enables always-on systems with minimal battery drain. |
| Efficiency | 81% at 12V→5V/250mA - high efficiency across wide input range due to adaptive mode selection and low-loss charge pump switches. |
| Oscillator | 500kHz typical - constant frequency operation reduces EMI filtering burden vs. variable-frequency charge pumps. |
| Protection | Overtemperature shutdown (175°C), short-circuit current limit (900mA), UVLO (2.4V rising) - ensures robust operation in harsh environments. |
Pinout & Package
Package: 12-lead plastic MSOP (MSE), thermally enhanced, exposed pad (Pin 13) connected to GND. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity (θJA = 40°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 for low-impedance path and current sharing. |
| BURST (Pin 4) | Mode Control Input | Logic high enables low-noise constant-frequency operation; logic low enables Burst Mode® for higher light-load efficiency. |
| SEL1 / SEL2 (Pins 5,6) | Output Configuration Inputs | Set VOUT mode: both low = shutdown; SEL1 high/SEL2 low = adjustable; SEL2 high/SEL1 low = fixed 5V; both high = fixed 3.3V. |
| OUTS/ADJ (Pin 7) | Feedback Node | Serves as output sense (OUTS) for fixed outputs or adjust (ADJ) reference (1.200V) for resistor-divider programming. |
| PGOOD (Pin 8) | Open-Drain Status Output | Signals valid regulation (≥95% VOUT) with 0.4V max low-level voltage at 0.2mA sink; requires external pull-up. |
| C+ / C– (Pins 9,11) | Flying Capacitor Terminals | Connect single 1µF ceramic flying capacitor; polarity-sensitive-C+ to positive plate, C– to negative plate. |
| VOUT (Pin 10) | Regulated Output | Delivers up to 250mA; internal reverse-blocking prevents backfeed when VIN drops below UVLO. |
| GND (Pins 12,13) | Ground Reference | Pins 12 and 13 (exposed pad) are common GND; exposed pad must be soldered to PCB ground for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in space-constrained automotive/industrial modules. |
| Automatic multimode operation | Seamlessly transitions between 2:1, 1:1, and 1:2 charge-pump ratios without external control, maintaining regulation and peak efficiency across 2.7V–38V input. |
| Low-noise constant-frequency architecture | Delivers <50mVpp output ripple (Burst Mode) or <20mVpp (Low Noise Mode) with 10µF ceramic output capacitor-critical for noise-sensitive analog/RF subsystems. |
| AEC-Q100 qualification | Rated for –40°C to 125°C junction temperature with automotive-grade reliability testing-enables use in engine control units and body electronics. |
| Thermally enhanced MSOP | 12-lead MSOP with exposed GND pad achieves θJA = 40°C/W, enabling 250mA continuous output without heatsink in standard PCB layouts. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface circuitry in engine control units under cold-crank (≤6V) and load-dump (≤38V) conditions. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator providing stable 5V rail from vehicle battery; manages mode transitions during transient voltage events. Use Value: Eliminates need for pre-regulator + LDO cascade; maintains regulation across full automotive voltage range with 81% efficiency at 12V→5V/250mA. | Use Scenario: Supplies auxiliary 3.3V logic rail for PLC I/O modules, motor drives, and fieldbus gateways operating from unregulated 12V/24V industrial supplies. IC Role / Device Role / Timing Role: Buck-boost housekeeping supply enabling single-rail system design; supports brownout-free operation during line sags. Use Value: 2.7V–38V input range accommodates wide industrial input tolerances; 18µA quiescent current minimizes standby power loss. |
| Low-Power 12V-to-5V Conversion | Adjustable Bias Supply for Sensors |
Use Scenario: Replaces inefficient linear regulators in battery-powered instrumentation where 12V source must power 5V ADCs, op-amps, and digital logic. IC Role / Device Role / Timing Role: High-efficiency switched-capacitor converter delivering regulated 5V with no inductor-related size or saturation limitations. Use Value: Achieves 81% efficiency at full 250mA load-doubling battery life versus linear solution; low 500kHz ripple simplifies filtering. | Use Scenario: Generates precision-adjustable bias voltage (2.5V–5V) for MEMS sensors, current-sense amplifiers, and reference buffers requiring tight tolerance and low noise. IC Role / Device Role / Timing Role: Programmable output regulator using external resistor divider; ADJ pin holds 1.200V reference with ±2.5mV accuracy over temperature. Use Value: Enables single-component solution for multiple sensor bias requirements; 0.2Ω closed-loop output impedance ensures <1.5% droop at 250mA step load. |
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 |
|---|---|---|---|
| MAX17522ATP+T | Inductor-based synchronous buck-boost; 4.5V–60V input; 3.3V/5V fixed or adjustable; 500mA output; higher peak efficiency but larger solution size. | Requires inductor and more external components; better suited for higher-current (>300mA) or lower-ripple (<10mVpp) applications. | Select MAX17522ATP+T when output current exceeds 250mA or when ultra-low output ripple mandates inductor-based topology. |
| LTC3265EMSE#PBF | Low-noise inverting/boost charge pump; 4.5V–32V input; generates ±5V or ±12V; no buck-boost capability; 100mA per rail. | Designed for bipolar supply generation (e.g., op-amp rails), not single-rail step-up/down; incompatible for 3.3V/5V housekeeping use cases. | Select LTC3265EMSE#PBF only for dual-rail applications requiring negative voltage; not a functional substitute for LTC3245IMSE#PBF's buck-boost function. |
Compared with MAX17522ATP+T and LTC3265EMSE#PBF, the LTC3245IMSE#PBF uniquely delivers inductorless buck-boost regulation with 250mA output, AEC-Q100 qualification, and seamless 2.7V–38V operation-making it optimal for compact, automotive-grade 5V/3.3V housekeeping rails where board space and reliability are critical.
Availability
LTC3245IMSE#PBF 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, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LTC3245IMSE#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 industrial, automotive, communications, and healthcare markets.
The LTC3245IMSE#PBF belongs to Analog Devices' Power Management product line, designed specifically for high-reliability, wide-input-range DC/DC conversion in automotive and industrial environments where inductor-free solutions are preferred.
FAQ
What input voltage range does the LTC3245IMSE#PBF support?
The LTC3245IMSE#PBF supports an input voltage range of 2.7V to 38V, enabling direct connection to automotive batteries (including cold-crank and load-dump transients) and industrial 24V systems. Its undervoltage lockout activates at 2.4V (rising) and 2.2V (falling), ensuring reliable startup and shutdown behavior across this full range.
How is the output voltage configured on the LTC3245IMSE#PBF?
The LTC3245IMSE#PBF output voltage is configured using SEL1 and SEL2 pins: fixed 5V (SEL2 = high, SEL1 = low), fixed 3.3V (both SEL1 and SEL2 = high), adjustable 2.5V–5V (SEL1 = high, SEL2 = low with external resistor divider on OUTS/ADJ), or shutdown (both SEL1 and SEL2 = low). The OUTS/ADJ pin serves as a 1.200V reference for precision adjustment.
Does the LTC3245IMSE#PBF require an inductor?
No, the LTC3245IMSE#PBF is a switched-capacitor buck-boost converter and requires only three external ceramic capacitors: one 1µF flying capacitor (CFLY) and two output/input storage capacitors (e.g., 10µF COUT). This eliminates inductors, reducing EMI, board area, and cost-ideal for space-constrained automotive and industrial designs.
What thermal performance can be expected from the LTC3245IMSE#PBF in MSOP package?
The LTC3245IMSE#PBF in the 12-lead MSOP package (MSE) has a junction-to-ambient thermal resistance (θJA) of 40°C/W when the exposed pad (Pin 13) is properly soldered to the PCB ground plane. At 250mA output into 5V with 12V input, typical power dissipation is ~120mW, resulting in ~5°C junction-to-ambient rise-well within its –40°C to 125°C operating junction temperature range.
Is the LTC3245IMSE#PBF qualified for automotive applications?
Yes, the LTC3245IMSE#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to 125°C junction temperature) and is manufactured with controlled processes to meet automotive reliability standards. It includes overtemperature shutdown (175°C), short-circuit protection, and robust input voltage tolerance-making it suitable for ECU, body control, and infotainment subsystems.
LTC3245IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3245IMSE#PBF FAQ
1.How can I place an order for LTC3245IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245IMSE#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 LTC3245IMSE#PBF reliable?
The price and inventory of LTC3245IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3245IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245IMSE#PBF?
LTC3245IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245IMSE#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 LTC3245IMSE#PBF?
For technical support, including LTC3245IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245IMSE#PBF requirements.
6.How does Aetrix verify that LTC3245IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3245IMSE#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 LTC3245IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3245IMSE#PBF?
All LTC3245IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245IMSE#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 LTC3245IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3245IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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