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Analog Devices Inc. LTC3245IMSE#TRPBF
- Part No.:
- LTC3245IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245IMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
LTC3245IMSE#TRPBF 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, achieves 81% efficiency at 12V→5V/250mA, and features pin-selectable Burst Mode® for ultra-low quiescent current (18µA operating, 4µA shutdown). It serves as a compact, inductorless power supply for automotive ECU/CAN transceiver rails and industrial housekeeping.
For engineers reviewing the LTC3245IMSE#TRPBF datasheet, LTC3245IMSE#TRPBF pinout, LTC3245IMSE#TRPBF application, or LTC3245IMSE#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, thermally enhanced 12-lead MSOP package, multimode operation across extreme VIN ranges, PGOOD monitoring capability, and trade-off between low-noise constant-frequency vs. high-efficiency Burst Mode operation.
Technical Context
The LTC3245IMSE#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 boost (VIN < VOUT). Internal comparators with load-dependent hysteresis select the optimal mode to maintain regulation and peak efficiency across varying input voltage and load conditions.
Its control loop regulates output by adjusting per-cycle charge transfer strength, storing error directly on the output capacitor. The OUTS/ADJ pin serves dual roles-output sensing for fixed outputs or feedback reference (1.200V ±24mV) for adjustable configurations-and PGOOD provides open-drain power-good signaling with 95% rising / 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, microcontroller I/O rails, and sensor interfaces in space-constrained systems. |
| VOUT Options | Fixed 3.3V or 5V, or adjustable 2.5V–5V - selected via SEL1/SEL2 logic pins; eliminates need for external feedback resistors in standard applications. |
| Quiescent Current | 18µA typical (operating), 4µA (shutdown) - enables always-on subsystems with multi-year battery life in low-power monitoring nodes. |
| Thermal Rating | Junction temperature max 150°C; MSOP package θJA = 40°C/W - requires exposed pad soldering to PCB ground for rated thermal performance in automotive under-hood environments. |
| Protection | Short-circuit current limiting (900mA typ) and overtemperature shutdown (175°C trip) - ensures robustness during fault conditions without external circuitry. |
| Oscillator | 500kHz typical frequency - enables small ceramic flying capacitor (1µF) and reduces EMI compared to lower-frequency charge pumps. |
Pinout & Package
The LTC3245IMSE#TRPBF is housed in a thermally enhanced 12-lead plastic MSOP package (3mm × 4.9mm) with exposed GND pad (Pin 13) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Power Input | Three parallel input pins accept 2.7V–38V; internal UVLO (2.4V rising) prevents operation below safe regulation threshold. |
| BURST (4) | Mode Control Input | Logic high enables low-noise constant-frequency operation; logic low activates Burst Mode for <20µA light-load IQ. |
| SEL1 (5), SEL2 (6) | Output Configuration Inputs | Binary-coded selection of fixed 5V (SEL2=HI, SEL1=LO), fixed 3.3V (both HI), adjustable (SEL2=LO, SEL1=HI), or shutdown (both LO). |
| OUTS/ADJ (7) | Feedback Reference | Serves as VOUT sense node for fixed outputs or 1.200V reference for resistor-divider programming of adjustable VOUT. |
| PGOOD (8) | Open-Drain Status Output | Signals valid regulation when VOUT reaches 95% of target; pulls low during UVLO, shutdown, or overload (VOUT < 91%). |
| C+ (9), C– (11) | Flying Capacitor Terminals | Connect external 1µF ceramic flying capacitor; polarity-sensitive interface critical for proper charge transfer in all three conversion modes. |
| VOUT (10) | Regulated Output | Delivers up to 250mA; includes internal short-circuit protection and reverse-blocking above UVLO threshold. |
| GND (12,13) | Ground Reference | Pins 12 and 13 (exposed pad) are internally connected; pad must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive applications (–40°C to +125°C junction), supporting ECU and CAN transceiver power in passenger vehicles and commercial fleets. |
| No Inductors Required | Uses only three external ceramic capacitors (1µF fly, 1µF input, 10µF output) - eliminates magnetic components, reducing board area, cost, and EMI concerns. |
| Automatic Multimode Operation | Seamlessly transitions between 2:1, 1:1, and 1:2 charge-pump ratios based on VIN and load - maintains regulation without manual configuration or mode pins. |
| Low-Noise Constant-Frequency Architecture | 500kHz fixed switching frequency with <20mVpp ripple (COUT=10µF) - suitable for noise-sensitive analog and RF subsystems where burst-mode artifacts are unacceptable. |
| Programmable Soft-Start | ~500µs linear output ramp-up - limits inrush current during power-on, preventing brownout of upstream supplies and stress on input capacitors. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Providing stable 5V rail to microcontrollers, CAN transceivers, and sensor interfaces inside engine control units exposed to cold-crank (2.7V) and load-dump (38V) events. IC Role / Device Role / Timing Role: Primary buck-boost regulator converting unregulated vehicle battery voltage to clean, regulated 5V with PGOOD sequencing and thermal protection. Use Value: Eliminates need for pre-regulator + LDO cascade; AEC-Q100 qualification and 150°C junction rating ensure reliability in under-hood environments. |
Use Scenario: Generating auxiliary 3.3V or 5V supplies for PLC I/O modules, fieldbus gateways, and programmable logic controllers operating from 24V industrial bus. IC Role / Device Role / Timing Role: Compact, inductorless housekeeping supply enabling dense PCB layouts while maintaining regulation across wide input transients. Use Value: 2.7V–38V input range accommodates brownout and surge conditions; low 18µA quiescent current extends backup battery runtime. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Converting 12V system rail to 5V for USB peripherals, display controllers, or communication ICs in portable test equipment and edge IoT gateways. IC Role / Device Role / Timing Role: High-efficiency (81% @ 250mA) buck-boost converter replacing inefficient linear regulators or bulky inductor-based solutions. Use Value: Delivers full 250mA at 81% efficiency with no magnetics - reduces heat generation and board footprint versus LDO or traditional DC/DC. |
Use Scenario: Generating precision-adjustable bias voltages (2.5V–5V) for MEMS sensors, ADC references, or op-amp rails in instrumentation and medical devices. IC Role / Device Role / Timing Role: Programmable output regulator using external resistor divider on OUTS/ADJ pin to set exact VOUT with 1.200V ±24mV reference accuracy. Use Value: Adjustable output avoids multiple SKUs; tight reference tolerance (±2%) enables accurate sensor excitation without trimming. |
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; 4.5V–60V input; 3.3V/5V fixed or adjustable; higher peak efficiency (>92%) but requires inductor and more external components. | Preferred where highest efficiency and >500mA output are required; unsuitable for ultra-low-noise or inductor-free designs. | Select MAX17521ATP+T when board space allows inductors and efficiency >90% is critical; LTC3245IMSE#TRPBF remains superior for EMI-sensitive, space-constrained, or AEC-Q100-compliant applications. |
| LTC3265EMSE#TRPBF | Low-noise inverting/positive charge pump; 4.5V–32V input; generates ±5V or ±12V; no adjustable positive output; 100mA max per rail. | Designed for bipolar supply generation (e.g., op-amp rails); lacks single-rail adjustable output and automotive qualification. | Choose LTC3265EMSE#TRPBF for dual-rail applications requiring low-noise negative voltage; LTC3245IMSE#TRPBF is the correct choice for single-rail, wide-VIN, AEC-Q100-compliant positive regulation. |
Compared with MAX17521ATP+T and LTC3265EMSE#TRPBF, the LTC3245IMSE#TRPBF uniquely combines inductorless design, AEC-Q100 qualification, programmable output, and seamless multimode operation - making it the only option meeting all requirements for automotive ECU and industrial housekeeping use cases demanding compactness, reliability, and wide input range.
Availability
LTC3245IMSE#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, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3245IMSE#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 with precision power, signal chain, and RF solutions.
The LTC3245 belongs to Analog Devices' high-voltage monolithic charge pump regulator product line, designed specifically for inductorless, wide-input-range power conversion in harsh environments including automotive under-hood and industrial control systems.
FAQ
What is the maximum output current capability of the LTC3245IMSE#TRPBF?
The LTC3245IMSE#TRPBF delivers up to 250mA continuous output current in 5V fixed mode with VIN = 12V. Current capability varies with input voltage and output configuration: at 3.3V output, it supports 250mA for VIN ≥ 5V, 175mA for 4V ≤ VIN < 5V, and 110mA for 3.3V ≤ VIN < 4V. The device includes short-circuit protection limiting output to ~900mA.
Does the LTC3245IMSE#TRPBF require an inductor?
No, the LTC3245IMSE#TRPBF is a switched-capacitor (charge pump) DC/DC converter and requires no inductor. It operates with only three external ceramic capacitors: a 1µF flying capacitor (CFLY), a 1µF input capacitor (CIN), and a minimum 10µF low-ESR output capacitor (COUT). This inductorless architecture reduces EMI, board area, and bill-of-materials cost.
How does the LTC3245IMSE#TRPBF select between 2:1, 1:1, and 1:2 conversion modes?
The LTC3245IMSE#TRPBF uses internal comparators with load-dependent hysteresis to automatically select the optimal conversion ratio. When VIN > 2×VOUT, it enters 2:1 step-down; when VOUT < VIN ≤ 2×VOUT, it uses 1:1 step-down; and when VIN < VOUT, it switches to 1:2 boost. Mode transitions occur seamlessly without user intervention to maintain regulation and maximize efficiency.
What is the purpose of the PGOOD pin on the LTC3245IMSE#TRPBF?
The PGOOD pin on the LTC3245IMSE#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 if VOUT drops below 91% due to overload or shutdown. It enables power sequencing and system-level fault detection when pulled up to VOUT or another logic rail with an external resistor.
Is the LTC3245IMSE#TRPBF qualified for automotive applications?
Yes, the LTC3245IMSE#TRPBF is AEC-Q100 qualified for automotive applications, rated for operation from –40°C to +125°C junction temperature. Its I-grade temperature rating, robust protection features (short-circuit, overtemperature), and ability to withstand cold-crank (2.7V) and load-dump (38V) conditions make it suitable for ECU, CAN transceiver, and body electronics power supplies.
LTC3245IMSE#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
LTC3245IMSE#TRPBF FAQ
1.How can I place an order for LTC3245IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245IMSE#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 LTC3245IMSE#TRPBF reliable?
The price and inventory of LTC3245IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3245IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245IMSE#TRPBF?
LTC3245IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245IMSE#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 LTC3245IMSE#TRPBF?
For technical support, including LTC3245IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3245IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3245IMSE#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 LTC3245IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3245IMSE#TRPBF?
All LTC3245IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245IMSE#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 LTC3245IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3245IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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