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Analog Devices Inc. LTC3245EMSE#TRPBF
- Part No.:
- LTC3245EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245EMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,760
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Product details
Overview
LTC3245EMSE#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 LTC3245EMSE#TRPBF datasheet, LTC3245EMSE#TRPBF pinout, LTC3245EMSE#TRPBF application, or LTC3245EMSE#TRPBF equivalent, key selection criteria include input voltage range (2.7V–38V), output current capability (250mA), multimode operation with automatic ratio selection, low quiescent current (18µA), and thermally enhanced 12-pin MSOP packaging with exposed GND pad.
Technical Context
The LTC3245EMSE#TRPBF 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 mode transitions without oscillation.
Regulation is achieved by sensing VOUT at the OUTS/ADJ pin and adjusting per-cycle charge transfer to match load demand. The control loop error is stored directly on COUT, forming the dominant pole; stability requires ≥4µF low-ESR ceramic output capacitance. PGOOD provides open-drain power-good signaling with 95% rising and 91% falling thresholds relative 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 down to 2.7V) and industrial 24V/36V rails without pre-regulation. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained systems. |
| Quiescent Current | 18µA typical - enables always-on operation in low-power automotive housekeeping rails with minimal battery drain. |
| Output Options | Fixed 3.3V, fixed 5V, or adjustable 2.5V–5V - selected via SEL1/SEL2 logic pins; eliminates need for external feedback resistors in standard configurations. |
| Operating Temp | –40°C to +125°C - rated for under-hood automotive environments and industrial control cabinets. |
| Protection | Short-circuit and overtemperature (150°C max junction) - ensures robustness during fault conditions without external circuitry. |
| Package | 12-lead MSOP with exposed GND pad - provides θJA = 40°C/W thermal resistance and mechanical reliability for reflow-soldered PCBs. |
Pinout & Package
Package: 12-lead plastic MSOP (MSE), 3mm × 4.9mm footprint, exposed thermal pad (Pin 13) connected to GND and required to be soldered to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2,3) | Power Input | Three parallel inputs accept 2.7V–38V; must be shorted together externally to reduce impedance and improve 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 (4µA shutdown). |
| SEL1 / SEL2 (Pins 5,6) | Output Configuration Inputs | Set 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 VOUT sense for fixed outputs or ADJ reference (1.200V ±2.4%) for resistor-divider programming of adjustable outputs. |
| PGOOD (Pin 8) | Open-Drain Status Output | Signals valid regulation when VOUT reaches ≥95% of target; requires external pull-up to VOUT or low-voltage rail. |
| 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; includes internal reverse-blocking to prevent backfeed when VIN drops below UVLO (2.2V typical). |
| GND (Pins 12,13) | Ground Reference | Pins 12 and 13 (exposed pad) are internally connected; pad must be soldered to PCB ground for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VIN range (2.7V–38V) | Eliminates need for upstream pre-regulators in automotive and industrial 12V/24V systems, supporting cold-crank and load-dump conditions. |
| Automatic multimode switching (2:1/1:1/1:2) | Maintains >75% efficiency across full VIN range without manual configuration or external mode control logic. |
| Low-noise constant-frequency operation | Reduces conducted EMI vs conventional charge pumps; enables use in noise-sensitive analog and RF subsystems. |
| AEC-Q100 qualification (Grade I) | Validated for automotive applications including ECU, body control modules, and infotainment power rails. |
| Thermally enhanced MSOP package | Exposes GND pad for direct PCB heat sinking, enabling 250mA continuous output at +85°C ambient without derating. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and EEPROM in engine control unit under varying battery voltage (6V–16V) and temperature (–40°C to +125°C). IC Role / Device Role / Timing Role: Primary 5V housekeeping regulator with PGOOD sequencing and short-circuit protection. Use Value: Eliminates inductor-based buck converter; reduces BOM count by 4 components and saves 25mm² PCB area while meeting AEC-Q100 requirements. |
Use Scenario: Generates stable 3.3V supply for PLC I/O modules and fieldbus interface ICs from unregulated 24V industrial rail. IC Role / Device Role / Timing Role: Non-isolated point-of-load regulator with UVLO and thermal shutdown for factory automation equipment. Use Value: Operates continuously across 2.7V–38V input without brownout; 18µA quiescent current extends backup battery life in fail-safe monitoring circuits. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Converts 12V vehicle battery to 5V for USB-C accessory ports and display backlight drivers in telematics units. IC Role / Device Role / Timing Role: High-efficiency buck-boost regulator with Burst Mode® enabled for dynamic load profiles (1mA–250mA). Use Value: Achieves 81% efficiency at 250mA (12V→5V), reducing thermal load vs LDO; 50mV output ripple (Burst Mode) meets USB power spec limits. |
Use Scenario: Provides programmable 2.5V–5V bias voltage for precision analog sensors (e.g., pressure, current shunt amplifiers) in test equipment. IC Role / Device Role / Timing Role: Adjustable-output charge-pump regulator with 1.200V reference tolerance (±2.4%) and low output impedance (0.3Ω @5V). Use Value: Enables single-part support for multiple sensor families via resistor-divider programming; eliminates need for discrete DAC or trimming potentiometers. |
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 |
|---|---|---|---|
| MAX17521ATP+T | Inductor-based synchronous buck-boost; wider 4.5V–60V input; higher 500mA output; requires external inductor and compensation network. | Used where higher output current or tighter output voltage accuracy (<±1%) is required; not suitable for ultra-low-EMI designs. | Select MAX17521ATP+T when >250mA load or >60V transient immunity is needed; avoid if board space or EMI constraints prohibit inductors. |
| LTC3265EMSE#TRPBF | Low-noise dual-output (±VOUT) charge pump; 2.7V–4.5V input only; 100mA per rail; includes integrated LDO post-regulators. | Targeted at precision bipolar analog supplies (e.g., op-amp rails); lacks wide-VIN capability and automotive qualification. | Select LTC3265EMSE#TRPBF for dual-rail analog signal chains; avoid for automotive or single-rail >4.5V input applications. |
Compared with MAX17521ATP+T and LTC3265EMSE#TRPBF, the LTC3245EMSE#TRPBF uniquely balances ultra-wide input range (2.7V–38V), inductorless design, AEC-Q100 qualification, and 250mA output in a compact MSOP package-making it optimal for cost- and space-sensitive automotive and industrial housekeeping rails.
Availability
LTC3245EMSE#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 voltage ranges.
Supply support for LTC3245EMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3245EMSE#TRPBF belongs to Analog Devices' Power Management product line, designed specifically for inductorless, wide-input-range DC/DC conversion in space- and noise-constrained automotive and industrial systems.
FAQ
What is the maximum output current of the LTC3245EMSE#TRPBF?
The LTC3245EMSE#TRPBF delivers up to 250mA continuous output current in 2:1 and 1:1 step-down modes. In 1:2 step-up mode, output current is limited to 150mA at VIN = 3.3V and 75mA at VIN = 2.7V due to internal charge-pump drive strength. Derating is required above +85°C ambient to maintain 150°C max junction temperature.
Does the LTC3245EMSE#TRPBF require an inductor?
No, the LTC3245EMSE#TRPBF is a switched-capacitor charge-pump DC/DC converter and requires only three external ceramic capacitors: one 1µF flying capacitor (CFLY) and two 10µF output/input capacitors (COUT, CIN). This eliminates magnetic components, reduces EMI, and simplifies layout compared to inductor-based regulators.
How is output voltage configured on the LTC3245EMSE#TRPBF?
Output voltage on the LTC3245EMSE#TRPBF is set via SEL1 and SEL2 logic pins: fixed 5V (SEL2=HI, SEL1=LO), fixed 3.3V (both HI), adjustable 2.5V–5V (SEL2=LO, SEL1=HI), or shutdown (both LO). For adjustable mode, a resistor divider connects OUTS/ADJ to GND with VOUT = 1.2V × (1 + RA/RB).
What is the purpose of the PGOOD pin on the LTC3245EMSE#TRPBF?
The PGOOD pin on the LTC3245EMSE#TRPBF is an open-drain output that signals valid regulation: it goes high-impedance when VOUT reaches ≥95% of its target voltage and returns low-impedance when VOUT falls below 91% due to overload or shutdown. It requires an external pull-up resistor (e.g., to VOUT) for proper logic-level signaling.
Is the LTC3245EMSE#TRPBF qualified for automotive applications?
Yes, the LTC3245EMSE#TRPBF is AEC-Q100 qualified (Grade I, –40°C to +125°C) and manufactured under controlled automotive processes. It includes built-in short-circuit protection, overtemperature shutdown (150°C max junction), and UVLO (2.2V typical) - making it suitable for ECU, CAN transceiver, and body electronics power rails.
LTC3245EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3245EMSE#TRPBF FAQ
1.How can I place an order for LTC3245EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245EMSE#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 LTC3245EMSE#TRPBF reliable?
The price and inventory of LTC3245EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3245EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245EMSE#TRPBF?
LTC3245EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245EMSE#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 LTC3245EMSE#TRPBF?
For technical support, including LTC3245EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3245EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3245EMSE#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 LTC3245EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3245EMSE#TRPBF?
All LTC3245EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245EMSE#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 LTC3245EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3245EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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