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Analog Devices Inc. LTC3245EMSE#PBF
- Part No.:
- LTC3245EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245EMSE#PBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,299
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Product details
Overview
LTC3245EMSE#PBF from Analog Devices is a wide-input (2.7V–38V), low-noise, 250mA switched-capacitor buck-boost DC/DC converter delivering 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#PBF datasheet, LTC3245EMSE#PBF pinout, LTC3245EMSE#PBF application, or LTC3245EMSE#PBF equivalent, key selection criteria include input voltage range (2.7V–38V), output current capability (250mA), multimode operation with automatic ratio selection, thermal performance (125°C max junction), and package compatibility (12-lead MSOP with exposed GND pad).
Technical Context
The LTC3245EMSE#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 boost (VIN < VOUT)-selected automatically based on real-time VIN, VOUT, and load conditions. Internal comparators with load-dependent hysteresis ensure stable transitions between modes without oscillation.
Regulation is achieved by controlling per-cycle charge transfer to maintain VOUT at the target value, with error stored directly on COUT. The device supports two distinct operational profiles: low-noise constant-frequency mode (BURST = high) with ~20mV ripple (COUT = 10µF), and higher-efficiency Burst Mode® (BURST = low) with ~50mV ripple and 18µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 38V - enables direct use across automotive battery (cold-crank to load-dump) and industrial 12V/24V rails without pre-regulation. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained systems. |
| VOUT Options | Fixed 3.3V, fixed 5V, or adjustable 2.5V–5V - selected via SEL1/SEL2 pins; eliminates need for external feedback resistors in standard applications. |
| IQ (Operating) | 18µA - enables ultra-low-power housekeeping supply in always-on automotive modules with minimal battery drain. |
| Oscillator Freq | 500kHz typical - provides predictable EMI profile and simplifies input/output filtering vs variable-frequency charge pumps. |
| Thermal Rating | –40°C to 125°C junction - validated for under-hood automotive environments and industrial control cabinets. |
| Protection | Short-circuit and overtemperature - internal limiting prevents latch-up during fault conditions; thermal shutdown at ~175°C with hysteresis. |
Pinout & Package
The LTC3245EMSE#PBF is housed in a thermally enhanced 12-lead plastic MSOP package (MSE) with an exposed GND pad (Pin 13) that must be soldered to PCB ground for thermal and electrical performance. Package dimensions: 3mm × 4.9mm, 0.85mm height.
| 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 bias circuitry. |
| BURST (Pin 4) | Mode Control | Logic-high selects low-noise constant-frequency operation; logic-low enables 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 VOUT sense for fixed outputs or ADJ reference (1.200V ±2.4%) for resistor-programmed outputs. |
| PGOOD (Pin 8) | Power Status | Open-drain output asserts high-impedance when VOUT reaches ≥95% of regulation; sinks current if VOUT drops below 91% or during UVLO/shutdown. |
| C+ / C– (Pins 9,11) | Flying Capacitor | Connect 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; high-impedance when VIN < UVLO (2.2V typ); reverse-current blocking prevents backfeed from VOUT to VIN. |
| GND (Pins 12,13) | Ground Reference | Pins 12 and 13 (exposed pad) are internally connected; exposed pad must be soldered to PCB GND plane for θJA = 40°C/W and safe thermal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless Buck-Boost Conversion | Eliminates magnetic components, reducing BOM cost, board area, and EMI concerns in noise-sensitive automotive and industrial designs. |
| Automatic Multimode Operation | Seamlessly transitions among 2:1, 1:1, and 1:2 charge-pump ratios without external control, maintaining regulation across full VIN range and load conditions. |
| Low-Noise Constant-Frequency Architecture | Delivers <20mVpp output ripple (COUT = 10µF) with predictable 500kHz switching spectrum, easing compliance with automotive EMC requirements. |
| AEC-Q100 Qualified (Grade I) | Validated for automotive applications including ECU and CAN transceiver power rails, with guaranteed operation from –40°C to +125°C junction temperature. |
| Minimal External Components | Requires only three ceramic capacitors (1µF fly, 1µF input, 10µF output) - reduces layout complexity and improves reliability versus multi-inductor solutions. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit under cold-crank (5.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary 5V housekeeping regulator providing stable, low-noise rail independent of battery fluctuations. Use Value: Eliminates need for upstream buck pre-regulator; maintains regulation across 2.7V–38V while consuming only 18µA quiescent current. | Use Scenario: Supplies 3.3V to isolated communication ICs and analog front-ends in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main system rail, enabling independent power sequencing and fault containment. Use Value: Delivers 250mA at 3.3V with automatic mode switching, ensuring stable output even during brownout events down to 2.7V input. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Converts 12V industrial bus to clean 5V for USB peripherals and digital I/O in edge gateway devices. IC Role / Device Role / Timing Role: Efficient, compact DC/DC stage replacing linear regulators to avoid thermal derating at 250mA load. Use Value: Achieves 81% efficiency at 12V→5V/250mA, dissipating only ~120mW - enabling operation in sealed enclosures without heatsinking. | Use Scenario: Generates precision 2.7V bias for MEMS pressure sensors in medical instrumentation requiring stable excitation voltage. IC Role / Device Role / Timing Role: Adjustable output regulator using external resistor divider to set exact VOUT within 2.5V–5V range. Use Value: Maintains ±1% output accuracy over temperature via 1.200V reference (±2.4mV), supporting high-resolution ADC measurements. |
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 |
|---|---|---|---|
| LTC3265EMSE#PBF | Includes integrated LDO post-regulator; lower max IOUT (100mA); wider VOUT adjust range (1.2V–5V); higher IQ (40µA). | Better suited for ultra-low-noise analog supplies where ripple must be <10mV; not optimal for high-current digital loads. | Select LTC3265EMSE#PBF only when LDO-cleaned output is required and load current ≤100mA. |
| MAX17521ATP+T | Inductor-based synchronous buck-boost; higher efficiency at >500mA; larger solution size; requires inductor and more passives. | Preferred for high-current (>300mA), high-efficiency (>90%) applications where board space allows magnetics. | Choose MAX17521ATP+T when output current exceeds 250mA or peak efficiency above 90% is mandatory. |
Compared with LTC3245EMSE#PBF, LTC3265EMSE#PBF adds LDO filtering at the cost of current capability and quiescent current, while MAX17521ATP+T trades component count and EMI simplicity for higher power delivery - making LTC3245EMSE#PBF the optimal balance of integration, efficiency, and noise for mid-current automotive/industrial housekeeping.
Availability
LTC3245EMSE#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 across extended temperature ranges and long production lifecycles.
Supply support for LTC3245EMSE#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 automotive, industrial, communications, and healthcare markets.
The LTC3245 belongs to Analog Devices' high-voltage monolithic charge-pump regulator product line, designed specifically for robust, inductorless power conversion in automotive and harsh-environment industrial applications.
FAQ
What input voltage range does the LTC3245EMSE#PBF support?
The LTC3245EMSE#PBF supports an input voltage range of 2.7V to 38V, covering automotive battery variations including cold-crank (down to ~5.5V) and load-dump transients (up to 36V). Its undervoltage lockout activates at 2.2V (falling) and 2.4V (rising), ensuring reliable startup and shutdown behavior across this full range. This eliminates the need for external pre-regulators in many vehicle subsystems.
How does the LTC3245EMSE#PBF select between 2:1, 1:1, and 1:2 conversion modes?
The LTC3245EMSE#PBF uses internal comparators with load-dependent hysteresis to automatically select the optimal conversion ratio - 2:1 step-down when VIN > 2×VOUT, 1:1 step-down when VOUT < VIN ≤ 2×VOUT, and 1:2 boost when VIN < VOUT. Mode transitions occur seamlessly without external intervention, maintaining regulation across varying input and load conditions while maximizing efficiency.
Can the LTC3245EMSE#PBF generate an adjustable output voltage?
Yes, the LTC3245EMSE#PBF can generate an adjustable output from 2.5V to 5V by configuring SEL1 = high and SEL2 = low, then connecting the OUTS/ADJ pin to a resistor divider between VOUT and GND. The internal reference is 1.200V ±2.4mV, enabling precise programming - for example, RA = 15kΩ and RB = 10kΩ yields VOUT = 3.0V. This flexibility supports custom sensor bias or mixed-voltage system requirements.
What is the purpose of the PGOOD pin on the LTC3245EMSE#PBF?
PGOOD on the LTC3245EMSE#PBF is an open-drain status indicator that goes high-impedance when VOUT reaches ≥95% of its final regulated value and remains high-impedance until VOUT falls below 91% due to overload or shutdown. It requires an external pull-up resistor (e.g., to VOUT) to assert a logic-high signal, enabling power sequencing, fault detection, and system reset coordination in automotive and industrial controllers.
Does the LTC3245EMSE#PBF require special layout considerations for thermal performance?
Yes - the LTC3245EMSE#PBF's exposed GND pad (Pin 13) must be soldered to a minimum 100mm² PCB copper area connected to internal/external ground planes. This ensures the specified θJA of 40°C/W and safe operation at 125°C junction temperature. Inadequate pad soldering or undersized thermal land increases junction temperature, potentially triggering thermal shutdown or reducing lifetime reliability in continuous 250mA operation.
LTC3245EMSE#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
LTC3245EMSE#PBF FAQ
1.How can I place an order for LTC3245EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245EMSE#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 LTC3245EMSE#PBF reliable?
The price and inventory of LTC3245EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3245EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245EMSE#PBF?
LTC3245EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245EMSE#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 LTC3245EMSE#PBF?
For technical support, including LTC3245EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245EMSE#PBF requirements.
6.How does Aetrix verify that LTC3245EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3245EMSE#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 LTC3245EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3245EMSE#PBF?
All LTC3245EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245EMSE#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 LTC3245EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3245EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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