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Analog Devices Inc. LTC3245EDE#TRPBF
- Part No.:
- LTC3245EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3245EDE#TRPBF.pdf
- Description:
- IC REG CHRG PUMP ADJ 250MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,248
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Product details
Overview
LTC3245EDE#TRPBF from Analog Devices is a wide-input (2.7V–38V), low-noise, 250mA switched-capacitor buck-boost DC/DC converter delivering 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#TRPBF datasheet, LTC3245EDE#TRPBF pinout, LTC3245EDE#TRPBF application, or LTC3245EDE#TRPBF equivalent, key selection criteria include input voltage range (2.7V–38V), output current capability (250mA), burst vs. low-noise mode trade-offs, thermal performance (125°C operating junction), and DFN package compatibility with space-constrained industrial and automotive PCB layouts.
Technical Context
The LTC3245EDE#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 step-up (VIN < VOUT). Internal comparators with load-dependent hysteresis optimize mode transitions to maintain regulation and peak efficiency across varying line and load conditions.
Its control loop regulates output by adjusting per-cycle charge transfer strength, storing error directly on COUT. The OUTS/ADJ pin serves dual roles-output sensing for fixed outputs or feedback reference (1.200V ±24mV) for adjustable configurations-while 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 battery-fed operation from 3-cell Li-ion (12.6V) up to 24V industrial rails and 36V automotive transients. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontroller housekeeping rails, and low-power sensors without external pass devices. |
| IQ (Operating) | 18µA - enables multi-year battery life in always-on automotive monitoring modules with minimal standby drain. |
| VOUT Options | Fixed 3.3V/5V or adjustable 2.5V–5V - eliminates need for external feedback resistors in standard logic supply applications. |
| Oscillator | 450kHz–500kHz - enables predictable EMI filtering and small ceramic flying capacitor (1µF) selection without inductor size penalties. |
| Thermal Rating | –40°C to 125°C junction - validated for under-hood automotive environments and industrial control cabinets without derating. |
| Protection | Short-circuit and overtemperature - latches off at ~175°C junction, re-enables at ~165°C; delivers 900mA short-circuit current before limiting. |
Pinout & Package
The LTC3245EDE#TRPBF is housed in a thermally enhanced 12-pin (3mm × 4mm) plastic DFN package with exposed GND pad (Pin 13) requiring soldering to PCB ground plane for rated θJA = 43°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Power Input | Three parallel pins accept 2.7V–38V input; must be tied together externally to minimize impedance and support full 250mA output. |
| BURST (4) | Mode Control | Logic high enables low-noise constant-frequency operation (20mV ripple); logic low activates Burst Mode for 18µA IQ and higher light-load efficiency. |
| SEL1 / SEL2 (5,6) | Output Configuration | Two-pin encoding selects shutdown (LL), adjustable (HL), fixed 5V (LH), or fixed 3.3V (HH); internal 1µA pull-downs allow direct VIN strapping. |
| OUTS/ADJ (7) | Feedback Node | Serves as VOUT sense for fixed outputs or 1.200V reference for adjustable mode; sets output via resistor divider (RA/RB) when SEL1=H, SEL2=L. |
| PGOOD (8) | Power Status | Open-drain output asserts high-impedance when VOUT reaches ≥95% of target; requires external pull-up to VOUT or logic rail for system sequencing. |
| C+ / C– (9,11) | Flying Capacitor | Connects external 1µF ceramic flying capacitor; polarity-sensitive-C+ to VIN/C– during 2:1 phase, C+ to VOUT/C– to GND during 1:1 phase. |
| VOUT (10) | Regulated Output | Delivers up to 250mA; internally disconnects from VIN below UVLO (2.2V typ.) to prevent reverse leakage into depleted batteries. |
| GND (12,13) | Ground Reference | Pins 12 and exposed pad 13 are common GND; pad must be soldered to PCB ground plane to meet thermal and electrical specs. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless Architecture | Eliminates magnetic components and associated EMI, enabling ultra-thin designs in space-constrained automotive ECUs and IoT sensor nodes. |
| Automatic Multimode Switching | Seamlessly transitions between 2:1, 1:1, and 1:2 charge-pump ratios based on VIN and load-no firmware or external control required. |
| AEC-Q100 Qualified | Validated for automotive applications including engine control units, body electronics, and infotainment power rails per Grade I (–40°C to 125°C). |
| Low-Noise Constant Frequency | 450kHz–500kHz fixed switching frequency reduces output ripple to 20mV (COUT = 10µF), easing compliance with sensitive analog or RF subsystem requirements. |
| Three-Capacitor Solution | Requires only one 1µF flying cap + one 10µF output cap + one 1µF input cap-minimizes BOM count and board area versus inductor-based alternatives. |
Applications
| Automotive ECU Power | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Supplying 5V to microcontrollers, CAN transceivers, and LIN interfaces in engine control units exposed to 12V/24V battery rails with cold-crank (4.5V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: Primary non-isolated buck-boost regulator providing stable 5V output with automatic mode switching to maintain regulation across wide input swings. Use Value: Eliminates need for discrete LDO post-regulation stages while sustaining 250mA output at 81% efficiency (12V→5V), reducing heat and component count. | Use Scenario: Generating 3.3V for FPGA configuration, ADC reference, and MCU I/O rails in programmable logic controllers operating from unregulated 12V or 24V industrial supplies. IC Role / Device Role / Timing Role: Compact, low-quiescent housekeeping supply replacing inefficient linear regulators or larger inductor-based DC/DC modules. Use Value: Delivers 220mA at 3.3V with 18µA IQ and no inductor-enabling fanless enclosure design and extended uptime during brownout conditions. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Converting 12V from a PoE-powered switch to regulated 5V for USB peripherals or Ethernet PHYs in network edge devices. IC Role / Device Role / Timing Role: Efficient intermediate bus converter supporting dynamic load steps up to 250mA with soft-start and PGOOD sequencing. Use Value: Achieves 81% efficiency at full load and maintains regulation down to 2.7V input-critical for maintaining operation during PoE cable voltage drop. | Use Scenario: Providing precision-adjustable 2.5V–5V bias for MEMS pressure sensors or current-sense amplifiers in portable medical instruments. IC Role / Device Role / Timing Role: Programmable output regulator using external resistor divider on OUTS/ADJ pin to set exact sensor excitation voltage. Use Value: 1.200V ±24mV reference enables <±1% output accuracy; low 0.3Ω closed-loop output impedance ensures stable bias under sensor load transients. |
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; wider 4.5V–60V input; higher 500mA output; requires external inductor and compensation. | Preferred where higher output current or tighter output tolerance (<±0.5%) is required; unsuitable for ultra-low EMI or inductor-free layouts. | Select MAX17522ATP+T when >250mA load or >38V input is needed; avoid if board space or EMI constraints prohibit inductors. |
| LTC3265EMSE#TRPBF | Low-noise inverting/boost charge pump; fixed ±5V dual output; 100mA per rail; no buck-boost capability; MSOP-16 package. | Used for bipolar sensor bias or op-amp supplies-not a functional replacement for single-rail buck-boost regulation. | Choose LTC3265EMSE#TRPBF only for dual-rail inverting/boost needs; not a substitute for LTC3245EDE#TRPBF's wide-input single-output function. |
Compared with MAX17522ATP+T and LTC3265EMSE#TRPBF, the LTC3245EDE#TRPBF uniquely combines inductorless operation, 2.7V–38V input flexibility, and 250mA output in a 3mm×4mm DFN-making it optimal for space- and EMI-sensitive automotive and industrial point-of-load applications where inductors are prohibited.
Availability
LTC3245EDE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, industrial housekeeping rails, and low-power 12V-to-5V conversion requiring stable component supply, AEC-Q100 compliance, and compact DFN packaging.
Supply support for LTC3245EDE#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' monolithic charge-pump DC/DC converter product line, designed specifically for inductorless, wide-input-voltage power conversion in harsh automotive and industrial environments where reliability, small footprint, and low EMI are critical.
FAQ
What input voltage range does the LTC3245EDE#TRPBF support, and how does it handle cold-crank conditions?
The LTC3245EDE#TRPBF supports an input voltage range of 2.7V to 38V, with undervoltage lockout (UVLO) activating below 2.2V (typical). During automotive cold-crank events where battery voltage dips to ~4.5V, the LTC3245EDE#TRPBF remains operational and maintains regulation-enabling continuous power to ECUs and CAN transceivers without brownout resets. Its 2:1/1:1/1:2 automatic mode switching ensures stable 5V or 3.3V output even as VIN varies dynamically.
How does the LTC3245EDE#TRPBF achieve low noise without an inductor?
The LTC3245EDE#TRPBF achieves low noise through its constant-frequency switched-capacitor architecture operating at 450kHz–500kHz, combined with precise per-cycle charge regulation and optimized flying capacitor timing. Unlike conventional charge pumps, it avoids burst-mode jitter and minimizes output ripple to 20mV (with 10µF COUT) in low-noise mode-eliminating the EMI and filtering challenges associated with inductors while maintaining tight regulation across load and line variations.
Can the LTC3245EDE#TRPBF be configured for adjustable output, and what is the reference voltage accuracy?
Yes, the LTC3245EDE#TRPBF can be configured for adjustable output (2.5V–5V) by connecting the OUTS/ADJ pin to a resistor divider between VOUT and GND, with SEL1 = high and SEL2 = low. The internal reference voltage at OUTS/ADJ is 1.200V ±24mV (±2%) over temperature, enabling accurate programming-for example, 3.3V output with RA = 180kΩ and RB = 100kΩ. This reference stability ensures <±1% output accuracy under typical operating conditions.
What thermal protection features does the LTC3245EDE#TRPBF include, and how do they behave during overload?
The LTC3245EDE#TRPBF includes overtemperature protection that disables the charge pump when junction temperature exceeds ~175°C (typical), then re-enables at ~165°C. During sustained overload, this thermal shutdown prevents permanent damage but causes intermittent output interruption. Its DFN package has θJA = 43°C/W, and the exposed GND pad must be soldered to PCB ground to ensure rated thermal performance-critical for automotive under-hood deployments where ambient temperatures reach 105°C.
Is the LTC3245EDE#TRPBF pin-compatible with other variants in the LTC3245 family, such as the MSOP version?
No, the LTC3245EDE#TRPBF (12-pin 3mm×4mm DFN) is not pin-compatible with the LTC3245EMSE#TRPBF (12-pin MSOP) due to differing pinouts and package footprints-though both share identical electrical functionality and feature sets. The DFN exposes GND on Pin 13 (thermal pad), while the MSOP places GND on Pin 12 only. PCB layout must be redesigned when migrating between packages; however, bill-of-materials and schematic design remain interchangeable.
LTC3245EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN 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-DFN (4x3)
LTC3245EDE#TRPBF FAQ
1.How can I place an order for LTC3245EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245EDE#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 LTC3245EDE#TRPBF reliable?
The price and inventory of LTC3245EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3245EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245EDE#TRPBF?
LTC3245EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245EDE#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 LTC3245EDE#TRPBF?
For technical support, including LTC3245EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3245EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3245EDE#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 LTC3245EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3245EDE#TRPBF?
All LTC3245EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245EDE#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 LTC3245EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3245EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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