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Analog Devices Inc. LTC3245EDE#PBF
- Part No.:
- LTC3245EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3245EDE#PBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 250MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:805
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Product details
Overview
LTC3245EDE#PBF from Analog Devices is a wide-input (2.7V–38V), low-noise, 250mA switched-capacitor buck-boost DC/DC converter delivering regulated fixed 5V or 3.3V output-or adjustable 2.5V–5V-using fractional charge-pump conversion without inductors. It features automatic multimode switching (2:1/1:1/1:2), 18µA quiescent current, and AEC-Q100 qualification for automotive ECU and CAN transceiver supplies.
For engineers reviewing the LTC3245EDE#PBF datasheet, LTC3245EDE#PBF pinout, LTC3245EDE#PBF application, or LTC3245EDE#PBF equivalent, key selection criteria include input voltage range coverage (2.7V–38V), burst-mode vs. low-noise operation trade-offs, PGOOD monitoring capability, thermal performance in DFN package (θJA = 43°C/W), and compatibility with ceramic-only external components (3×1µF fly + 10µF output).
Technical Context
The LTC3245EDE#PBF implements a constant-frequency switched-capacitor architecture with three automatic conversion modes: 2:1 step-down (VIN > 2×VOUT), 1:1 linear-like regulation (VOUT < VIN < 2×VOUT), and 1:2 boost (VIN < VOUT). Mode selection is governed by internal comparators with load-dependent hysteresis to maximize efficiency across input and load variations.
Its control loop regulates output by adjusting per-cycle charge transfer onto the output capacitor, eliminating traditional PWM or hysteretic control. The OUTS/ADJ pin serves dual roles-output sensing for fixed outputs or 1.200V reference for adjustable configurations-while BURST, SEL1, and SEL2 pins configure operating mode, noise profile, and enable state via logic-level inputs tolerant up to 38V.
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 at 5V - sufficient for powering CAN transceivers, microcontroller housekeeping rails, and small sensors. |
| IQ (Operating) | 18µA typical - enables always-on subsystems in automotive body electronics with minimal battery drain. |
| Output Options | Fixed 3.3V/5V or adjustable 2.5V–5V - configured via SEL1/SEL2 pins; eliminates need for external feedback resistors in fixed-output use cases. |
| Protection | Short-circuit and overtemperature (175°C shutdown, 165°C restart) - ensures robustness in unregulated automotive environments. |
| Package | 12-pin 3mm × 4mm DFN with exposed pad - thermally enhanced layout for 150°C max junction temperature and 43°C/W θJA. |
| Oscillator | 500kHz typical - enables compact 1µF flying capacitor and predictable EMI behavior versus variable-frequency charge pumps. |
Pinout & Package
Package: 12-lead (3mm × 4mm) plastic DFN with exposed thermal pad (Pin 13 = GND). Requires soldering of exposed pad to PCB ground plane for thermal compliance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Power Input | Three parallel input pins accept 2.7V–38V; must be shorted together on PCB for low-impedance path and optimal thermal distribution. |
| BURST (4) | Mode Control Input | Logic high enables low-noise constant-frequency operation; logic low activates Burst Mode for <20µA IQ at light loads. |
| SEL1 (5), SEL2 (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 (7) | Feedback Node | Serves as VOUT sense for fixed outputs or 1.200V reference for adjustable outputs; connects to resistor divider or directly to VOUT. |
| PGOOD (8) | Open-Drain Status Output | Signals valid regulation (95% VOUT) with 0.4V max low-level voltage; requires external pull-up to VOUT or logic rail. |
| C+ (9), C– (11) | Flying Capacitor Terminals | Interface with single 1µF ceramic flying capacitor; polarity-sensitive-C+ connects to VIN side during 2:1 phase, C– to GND. |
| VOUT (10) | Regulated Output | Delivers up to 250mA; internally disconnects from VIN below UVLO (2.2V) to prevent reverse leakage. |
| GND (12), Exposed Pad (13) | Ground Reference | Both pins are system ground; exposed pad is mandatory for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless Buck-Boost Conversion | Eliminates magnetic components and associated EMI, simplifying layout and reducing BOM count to only three 1µF ceramics + one 10µF output cap. |
| Automatic Multimode Operation | Seamlessly transitions between 2:1, 1:1, and 1:2 charge-pump ratios based on VIN/VOUT/load-no external control required. |
| Low-Noise Constant-Frequency Mode | 500kHz fixed switching delivers <20mVPP ripple (10µF COUT) and predictable spectral content for noise-sensitive analog circuits. |
| AEC-Q100 Qualified (Grade I) | Rated for –40°C to +125°C junction temperature and validated for automotive ECU/CAN applications per stress test requirements. |
| Integrated Protection | Short-circuit current limiting (~900mA) and thermal shutdown with hysteresis prevent damage during fault conditions without external circuitry. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Providing stable 5V supply to engine control unit (ECU) microcontrollers and CAN transceivers under cold-crank (2.7V) and load-dump (38V) conditions. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator converting raw battery voltage to clean 5V rail with PGOOD sequencing and thermal margin. Use Value: Eliminates need for pre-regulator + LDO cascade; maintains regulation across full automotive voltage range while meeting AEC-Q100 reliability standards. |
Use Scenario: Generating 3.3V auxiliary power for PLC I/O modules, sensor interfaces, and communication peripherals in factory automation systems. IC Role / Device Role / Timing Role: Compact, low-quiescent housekeeping regulator replacing discrete buck converters where board space and component count are constrained. Use Value: 18µA IQ extends uptime in battery-backed systems; 12-pin DFN footprint (3mm × 4mm) saves >40% area versus MSOP alternatives. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Converting 12V industrial bus to 5V for USB peripherals, display controllers, or legacy logic in energy-conscious edge devices. IC Role / Device Role / Timing Role: Efficient buck-boost converter operating in 1:1 mode near VIN = VOUT, minimizing conduction loss and heat generation. Use Value: 81% efficiency at 12V→5V/250mA reduces thermal load versus linear regulators; no inductor enables conformal coating compatibility. |
Use Scenario: Delivering programmable 2.5V–5V bias voltage to precision analog sensors (e.g., pressure, temperature) requiring stable excitation. IC Role / Device Role / Timing Role: Adjustable-output charge-pump regulator using OUTS/ADJ pin with external resistor divider for fine-tuned voltage setting. Use Value: 1.200V ±2.0% reference enables <1% output accuracy; low output impedance (0.3Ω @5V) ensures minimal load-induced droop. |
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 at >500mA loads is critical; unsuitable for ultra-low-EMI or inductor-free designs. | Select MAX17521ATP+T when input exceeds 38V or continuous >300mA output is needed; avoid if board space or EMI sensitivity prohibits inductors. |
| TPS60403DBVR | Inductorless charge pump; 1.6V–5.5V input; fixed 5V output; 60mA max; no Burst Mode; no PGOOD; smaller 5-pin SOT-23 package. | Targeted at low-current portable devices; lacks automotive qualification, wide-VIN support, and multimode flexibility. | Choose TPS60403DBVR only for sub-60mA, single-cell battery-powered applications where size trumps performance and qualification. |
Compared with MAX17521ATP+T and TPS60403DBVR, the LTC3245EDE#PBF uniquely balances ultra-wide VIN (2.7V–38V), inductorless design, AEC-Q100 qualification, and multimode efficiency optimization-making it the only drop-in solution for automotive and industrial 5V/3.3V housekeeping where reliability, simplicity, and voltage range are jointly critical.
Availability
LTC3245EDE#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 and voltage ranges.
Supply support for LTC3245EDE#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 precision instrumentation, industrial automation, and automotive safety markets.
The LTC3245EDE#PBF belongs to Analog Devices' Power by Linear™ family of highly integrated DC/DC converters designed specifically for space-constrained, wide-input automotive and industrial applications demanding reliability without inductors.
FAQ
What input voltage range does the LTC3245EDE#PBF support, and how does it handle cold-crank conditions?
The LTC3245EDE#PBF supports an input voltage range of 2.7V to 38V, enabling direct connection to automotive batteries during cold-crank events (down to 2.7V) and load-dump transients (up to 38V). Its undervoltage lockout threshold is 2.2V (falling), ensuring reliable startup and regulation even under severe battery sag. This makes the LTC3245EDE#PBF suitable for primary power conversion in ECUs and CAN nodes without external pre-regulation.
How does the LTC3245EDE#PBF achieve regulation without an inductor, and what external components are required?
The LTC3245EDE#PBF uses switched-capacitor fractional conversion with a single 1µF flying capacitor (CFLY) and two 1µF bypass capacitors on VIN, plus a 10µF low-ESR ceramic output capacitor (COUT). It achieves regulation by dynamically selecting among 2:1 step-down, 1:1 linear-like, and 1:2 boost modes based on VIN and load-eliminating inductors while maintaining tight output tolerance (±4% for fixed outputs) and low ripple (<20mVPP in low-noise mode).
Can the LTC3245EDE#PBF generate an adjustable output voltage, and how is it configured?
Yes, the LTC3245EDE#PBF supports adjustable output from 2.5V to 5V using the OUTS/ADJ pin as a 1.200V reference. To configure, set SEL2 = LOW and SEL1 = HIGH, then connect a resistor divider between VOUT and GND with the tap to OUTS/ADJ. The output voltage is calculated as VOUT = 1.200V × (1 + RA/RB), where RB is selected between 1kΩ and 1MΩ to balance accuracy and quiescent current.
What is the purpose of the PGOOD pin on the LTC3245EDE#PBF, and how should it be used in system design?
The PGOOD pin on the LTC3245EDE#PBF is an open-drain output that signals valid regulation-going high-impedance when VOUT reaches 95% of its target and returning low when VOUT falls below 91%. It must be pulled up externally (e.g., to VOUT with a 100kΩ resistor) to generate a logic-high signal. This enables safe power sequencing in multi-rail systems and fault detection in automotive and industrial controllers.
Is the LTC3245EDE#PBF qualified for automotive applications, and what temperature grade does the E-grade suffix indicate?
Yes, the LTC3245EDE#PBF is AEC-Q100 qualified for automotive applications. The "E" in the part number denotes the commercial/industrial grade with guaranteed operation from –40°C to +125°C junction temperature, matching the requirements for engine bay and cabin ECU environments. Its thermally enhanced DFN package (θJA = 43°C/W) and integrated overtemperature protection ensure robustness under sustained high-temperature operation.
LTC3245EDE#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)
LTC3245EDE#PBF FAQ
1.How can I place an order for LTC3245EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245EDE#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 LTC3245EDE#PBF reliable?
The price and inventory of LTC3245EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3245EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245EDE#PBF?
LTC3245EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245EDE#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 LTC3245EDE#PBF?
For technical support, including LTC3245EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245EDE#PBF requirements.
6.How does Aetrix verify that LTC3245EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3245EDE#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 LTC3245EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3245EDE#PBF?
All LTC3245EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245EDE#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 LTC3245EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3245EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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