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Analog Devices Inc. LTC3245MPMSE#PBF
- Part No.:
- LTC3245MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245MPMSE#PBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,564
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Product details
Overview
LTC3245MPMSE#PBF 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, requires no inductors, and features pin-selectable Burst Mode® for efficiency optimization. It is AEC-Q100 qualified and rated for –55°C to 150°C junction operation in automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3245MPMSE#PBF datasheet, LTC3245MPMSE#PBF pinout, LTC3245MPMSE#PBF application, or LTC3245MPMSE#PBF equivalent, key selection criteria include its ultra-wide VIN range, dual-mode (Burst/Low-Noise) operation, PGOOD monitoring, thermally enhanced MSOP-12 package with exposed pad, and guaranteed operation across extended temperature extremes without derating.
Technical Context
The LTC3245MPMSE#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). Internal comparators with load-dependent hysteresis select the optimal mode to maintain regulation while maximizing efficiency across varying input 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 as either feedback sense (fixed outputs) or adjustable reference (1.200V ±24mV), enabling precise VOUT programming via external resistor divider. 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 12V/24V automotive rails and unregulated industrial supplies without pre-regulation. |
| IOUT Max | 250mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained systems. |
| Quiescent Current | 18µA typical operating / 4µA shutdown - enables always-on functionality in battery-backed or low-power monitoring applications. |
| Output Accuracy | ±4% over full temperature and load range - ensures reliable logic-level compliance for 3.3V/5V digital subsystems. |
| Oscillator Frequency | 450kHz to 500kHz - fixed-frequency operation simplifies EMI filtering and reduces input/output ripple vs variable-frequency charge pumps. |
| Thermal Rating | Junction range –55°C to 150°C - validated for under-hood automotive and high-ambient industrial environments. |
| Protection | Short-circuit and overtemperature shutdown - prevents latch-up or thermal runaway during fault conditions without external circuitry. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed thermal pad (Pin 13 = GND), θJA = 40°C/W, footprint compatible with industry-standard MSOP-12 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Power Input | Three parallel inputs accept 2.7V–38V; must be shorted externally for low-impedance path to internal charge pump and bias circuitry. |
| BURST (4) | Mode Control | Logic-high enables low-noise constant-frequency operation; logic-low activates Burst Mode® for <20µA quiescent current at light loads. |
| SEL1 / SEL2 (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 (7) | Feedback Node | Serves as VOUT sense for fixed outputs or 1.200V reference for adjustable mode; connects to resistor divider for 2.5V–5V programming. |
| PGOOD (8) | Power Status Monitor | Open-drain output signals valid regulation when VOUT reaches ≥95% of target; pulls low during UVLO or overload. |
| C+ / C– (9,11) | Flying Capacitor Interface | Connects external 1µF ceramic flying capacitor; polarity-sensitive terminals define charge-transfer path for all three conversion modes. |
| VOUT (10) | Regulated Output | Delivers up to 250mA; internally disconnects from VIN below UVLO (2.2V typ.) to prevent reverse leakage. |
| GND (12,13) | Reference & Thermal Path | Pins 12 and exposed pad (13) are bonded to die substrate; pad must be soldered to PCB ground plane for thermal performance and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless Buck-Boost Architecture | Eliminates magnetic components, reducing board area, cost, and EMI concerns in dense automotive/industrial PCBs. |
| Automatic Multimode Conversion | Seamlessly transitions between 2:1, 1:1, and 1:2 charge-pump ratios without external control or timing adjustments. |
| Low-Noise Constant-Frequency Operation | 450–500kHz fixed switching minimizes conducted/radiated noise, easing compliance with automotive EMC standards. |
| AEC-Q100 Qualified MP Grade | Tested and guaranteed over –55°C to 150°C junction temperature, meeting automotive reliability and lifetime requirements. |
| Minimal External Components | Requires only three ceramic capacitors (1µF fly, 1µF input, 10µF output) - no resistors needed for fixed-output configurations. |
Applications
| Automotive ECU Power Supply | Industrial Sensor Node Housekeeping |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and analog front-end in engine control unit exposed to 12V battery rail with cold-crank dips to 2.7V and load-dump spikes to 38V. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC regulator providing stable 5V rail; manages dynamic load steps and maintains regulation during transient brownouts. Use Value: Eliminates need for pre-regulator + LDO cascade; delivers 250mA at 81% efficiency from 12V→5V while surviving automotive temperature and voltage extremes. |
Use Scenario: Supplies 3.3V to low-power IoT sensor nodes in factory automation cabinets where ambient temperature exceeds 85°C and input is unregulated 24V DC. IC Role / Device Role / Timing Role: Compact, thermally robust housekeeping supply enabling long-term reliability without heatsinking or airflow. Use Value: Operates continuously at 150°C junction temperature with no derating; 18µA quiescent current extends battery life in wake-on-event designs. |
| Low-Power 12V-to-5V Conversion | Adjustable Bias for Precision ADC Reference |
Use Scenario: Replaces inefficient linear regulators in portable test equipment requiring clean 5V from a 12V Li-ion pack across 3.0V–4.2V cell voltage range. IC Role / Device Role / Timing Role: Efficient buck-boost converter maintaining regulation as battery discharges; Burst Mode® extends runtime at standby. Use Value: Achieves 81% efficiency at full 250mA load and >90% at light loads, reducing thermal stress and extending battery service life. |
Use Scenario: Generates precision-adjustable 2.75V bias for 24-bit SAR ADC reference buffer in metrology-grade data acquisition modules. IC Role / Device Role / Timing Role: Low-noise, low-drift adjustable regulator using OUTS/ADJ feedback with 1.200V ±24mV reference and <0.2mV/mA load regulation. Use Value: Enables accurate 2.75V output (±0.5%) via external resistor divider; constant-frequency operation minimizes noise coupling into sensitive analog signal paths. |
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 | Lower IOUT (100mA), integrated LDO post-regulator, dual-output (±VOUT), wider VIN (4.5V–32V) | Targeted at precision bipolar analog supplies; lacks 2.7V start-up and automotive temp grade | Select for dual-rail analog systems needing ultra-low noise; avoid for automotive or >100mA single-rail needs. |
| MAX17521ATP+T | Inductor-based synchronous buck-boost, higher IOUT (2A), lower IQ (12µA), no Burst Mode®, smaller DFN package | Higher power density but requires inductor; less suitable for EMI-sensitive or ultra-compact layouts | Select for >500mA loads or where inductor integration is acceptable; avoid when inductor-free design is mandatory. |
Compared with LTC3245MPMSE#PBF, LTC3265EMSE#PBF trades output current and automotive qualification for bipolar capability and post-LDO noise reduction, while MAX17521ATP+T offers higher power and efficiency at the cost of magnetic component requirement and loss of ultra-wide VIN start-up.
Availability
LTC3245MPMSE#PBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial sensor node housekeeping, and low-power 12V-to-5V conversion requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3245MPMSE#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 LTC3245MPMSE#PBF belongs to Analog Devices' Power Management product line, designed specifically for rugged, inductorless DC/DC conversion in automotive and high-reliability industrial applications demanding wide input range and extended temperature operation.
FAQ
What is the minimum input voltage required for LTC3245MPMSE#PBF to start regulation?
The LTC3245MPMSE#PBF has an undervoltage lockout (UVLO) threshold of 2.2V (typical) on the falling edge and 2.4V (typical) on the rising edge. Regulation begins once VIN rises above 2.4V and remains active down to 2.2V before shutdown. This allows reliable operation during automotive cold-crank events where battery voltage dips to 2.7V, well within the device's functional range.
How does LTC3245MPMSE#PBF achieve regulation without an inductor?
The LTC3245MPMSE#PBF uses a switched-capacitor (charge-pump) topology with three fractional conversion modes: 2:1 step-down, 1:1 pass-through, and 1:2 step-up. It transfers charge between VIN, VOUT, and an external flying capacitor (CFLY) in precisely timed phases controlled by internal MOSFET switches. Regulation is achieved by dynamically adjusting the amount of charge transferred per cycle based on output voltage feedback at the OUTS/ADJ pin.
Can LTC3245MPMSE#PBF be used to generate an adjustable output voltage?
Yes, the LTC3245MPMSE#PBF supports adjustable output from 2.5V to 5V by configuring SEL2 = LOW and SEL1 = HIGH to enable ADJ mode, then connecting the OUTS/ADJ pin to a resistor divider between VOUT and GND. The internal reference is 1.200V ±24mV, and the output voltage is calculated as VOUT = 1.2V × (1 + RA/RB). This configuration avoids external compensation and maintains stability with standard ceramic output capacitors.
What is the purpose of the exposed pad (Pin 13) on the LTC3245MPMSE#PBF MSOP package?
The exposed pad (Pin 13) on the LTC3245MPMSE#PBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane to ensure proper thermal dissipation (θJA = 40°C/W) and electrical stability. Omitting this connection degrades thermal performance, risks exceeding the 150°C maximum junction temperature, and may cause output regulation instability or premature thermal shutdown.
Does LTC3245MPMSE#PBF support power-good monitoring, and how is it implemented?
Yes, the LTC3245MPMSE#PBF includes an open-drain PGOOD pin (Pin 8) that signals valid output regulation. It transitions to high-impedance when VOUT reaches ≥95% of its final regulated value and returns low when VOUT falls below 91% due to overload or shutdown. A pull-up resistor to VOUT or another low-voltage rail is required; adding an RC network to PGOOD enables programmable power-up delay for system sequencing.
LTC3245MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3245MPMSE#PBF FAQ
1.How can I place an order for LTC3245MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245MPMSE#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 LTC3245MPMSE#PBF reliable?
The price and inventory of LTC3245MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3245MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245MPMSE#PBF?
LTC3245MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245MPMSE#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 LTC3245MPMSE#PBF?
For technical support, including LTC3245MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3245MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3245MPMSE#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 LTC3245MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3245MPMSE#PBF?
All LTC3245MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245MPMSE#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 LTC3245MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3245MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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