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Analog Devices Inc. LTC3245HMSE#PBF
- Part No.:
- LTC3245HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3245HMSE#PBF.pdf
- Description:
- IC REG CHG PUMP ADJ 250MA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:294
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Product details
Overview
LTC3245HMSE#PBF from Analog Devices is a wide-input (2.7V–38V), low-noise, 250mA switched-capacitor buck-boost DC/DC converter in a thermally enhanced 12-lead MSOP package. It delivers regulated fixed 3.3V/5V or adjustable 2.5V–5V output using fractional charge-pump conversion with automatic 2:1/1:1/1:2 mode switching-enabling stable power for automotive ECU/CAN transceiver supplies and industrial housekeeping rails without inductors.
For engineers reviewing the LTC3245HMSE#PBF datasheet, LTC3245HMSE#PBF pinout, LTC3245HMSE#PBF application, or LTC3245HMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, 18µA operating quiescent current, 500kHz constant-frequency operation, and pin-selectable Burst Mode® versus low-noise regulation modes.
Technical Context
The LTC3245HMSE#PBF implements a three-mode switched-capacitor architecture: 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-current-proportional hysteresis dynamically select the optimal ratio to maintain regulation across input and load variations.
Its constant-frequency control loop regulates output by adjusting per-cycle charge transfer, storing error signal directly on COUT-yielding lower output ripple than conventional charge pumps. The BURST pin enables trade-off between efficiency (Burst Mode®, 4µA shutdown, 20µA no-load) and noise (low-noise mode, 20mV typical ripple with 10µF COUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 38V - supports direct battery input from 3-cell Li-ion to 24V industrial rails without pre-regulation. |
| VOUT Options | Fixed 3.3V/5V or adjustable 2.5V–5V - selected via SEL1/SEL2 pins; ADJ reference = 1.200V ±2.4%. |
| IOUT Max | 250mA - sustained output current in 2:1/1:1 modes; reduced in 1:2 mode due to drive limitation. |
| Quiescent Current | 18µA (operating), 4µA (shutdown) - enables always-on subsystems in automotive/industrial applications. |
| Thermal Rating | Junction temp up to 150°C - H-grade qualification ensures reliability in under-hood or high-ambient environments. |
| Oscillator Freq | 450kHz–500kHz - fixed-frequency operation simplifies EMI filtering and reduces input/output ripple sensitivity. |
| Protection | Short-circuit and overtemperature - thermal shutdown at ~175°C with hysteresis; indefinite short-circuit tolerance. |
Pinout & Package
Package: 12-lead plastic MSOP with exposed pad (Pin 13 = GND), θJA = 40°C/W, rated for –40°C to 150°C junction operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,2,3) | Power Input | Three parallel inputs accept 2.7V–38V; must be tied together for low-impedance path and thermal sharing. |
| BURST (4) | Mode Control | Logic high = low-noise constant-frequency; logic low = Burst Mode® for higher light-load efficiency. |
| SEL1 (5), SEL2 (6) | Output Configuration | Set fixed 5V (SEL2=HI/SEL1=LO), fixed 3.3V (both HI), adjustable (SEL2=LO/SEL1=HI), or shutdown (both LO). |
| OUTS/ADJ (7) | VOUT Sense / Adjust | Serves as feedback node: shorted to VOUT for fixed outputs; connected to resistor divider for adjustable VOUT. |
| PGOOD (8) | Power Good Flag | Open-drain output asserts high-impedance when VOUT reaches ≥95% of regulation; falls at ≤91%. |
| C+ (9), C– (11) | Flying Capacitor Interface | Connect external 1µF ceramic flying capacitor; polarity-sensitive terminals for charge transfer phases. |
| VOUT (10) | Regulated Output | Delivers up to 250mA; internal reverse-blocking prevents backfeed when VIN drops below UVLO (2.2V typ). |
| GND (12,13) | Ground Reference | Pins 12 + exposed pad (13) are common GND; pad must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Uses single 1µF flying capacitor and three external ceramics - eliminates magnetic EMI, saves board space, lowers BOM cost. |
| Automatic multimode switching | Seamlessly transitions between 2:1, 1:1, and 1:2 charge-pump ratios based on VIN/VOUT/load - maintains regulation without user intervention. |
| AEC-Q100 qualified | H-grade variant meets automotive reliability standards for ECU, CAN transceiver, and body electronics applications. |
| Low-noise constant frequency | 450–500kHz fixed switching minimizes conducted EMI; 20mV typical ripple (10µF COUT) vs. 50mV in Burst Mode®. |
| Integrated protection | Short-circuit current limiting (900mA typ) and thermal shutdown with hysteresis - enables robust operation in unattended systems. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface in engine control unit under varying battery voltage (6V–16V cold-crank to alternator surge). IC Role / Device Role / Timing Role: Primary 5V housekeeping regulator delivering 250mA with UVLO lockout and thermal resilience up to 150°C junction. Use Value: Eliminates need for pre-regulator + LDO cascade; maintains regulation during 6V cranking dips and 38V load-dump transients. |
Use Scenario: Generating stable 3.3V rail for PLC I/O modules, fieldbus interfaces, and isolated ADCs in factory automation cabinets. IC Role / Device Role / Timing Role: Wide-input buck-boost converter supplying isolated digital logic and communication ICs from 12V/24V system rails. Use Value: Supports brownout-free operation across 2.7V–38V input range; low 18µA quiescent current extends backup battery life. |
| Low-Power 12V-to-5V Conversion | Adjustable Bias Supply for Sensors |
|
Use Scenario: Replacing inefficient linear regulators in battery-powered test equipment requiring clean 5V from 12V LiPo pack. IC Role / Device Role / Timing Role: High-efficiency (81% at 12V→5V/250mA) charge-pump converter with selectable low-noise/Burst Mode® operation. Use Value: Doubles runtime vs. LDO; 500kHz fixed frequency allows compact RC filtering instead of bulky LC stages. |
Use Scenario: Providing programmable 2.5V–5V bias to precision analog sensors (e.g., RTD, strain gauges) in portable instrumentation. IC Role / Device Role / Timing Role: Adjustable-output regulator with 1.200V ±2.4% reference and resistor-divider programming for accurate sensor excitation. Use Value: Enables single-component solution for multiple sensor VREF requirements; tight reference tolerance minimizes calibration drift. |
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 only; requires external inductor and compensation. | Higher peak efficiency (>92%) but larger solution size and magnetic EMI; not suitable for ultra-low-noise or inductor-free designs. | Select MAX17521ATP+T when highest efficiency and wide input are critical, and board space/EMI allow inductor use. |
| LTC3265EMSE#PBF | Low-noise inverting/boost charge pump; 4.5V–32V input; dual ±1.8V/±3.3V outputs; no buck-boost capability. | Designed for bipolar bias generation (e.g., op-amp supplies); lacks positive buck-boost functionality and PGOOD flag. | Select LTC3265EMSE#PBF only for dual-rail inverting/boost needs-not a functional substitute for LTC3245HMSE#PBF's single-rail buck-boost role. |
Compared with MAX17521ATP+T and LTC3265EMSE#PBF, the LTC3245HMSE#PBF uniquely combines inductorless buck-boost operation, AEC-Q100 H-grade qualification, and pin-selectable noise/efficiency trade-offs-making it the only drop-in solution for space-constrained automotive and industrial 3.3V/5V housekeeping rails.
Availability
LTC3245HMSE#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 long product lifecycles.
Supply support for LTC3245HMSE#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 (now part of Analog Devices, Inc., formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3245HMSE#PBF belongs to the LTC® switched-capacitor DC/DC converter family, designed specifically for inductorless, wide-input, low-quiescent-power regulation in automotive, industrial, and space-constrained applications.
FAQ
What is the maximum junction temperature rating for the LTC3245HMSE#PBF?
The LTC3245HMSE#PBF is an H-grade device rated for operation up to 150°C junction temperature, with thermal shutdown activating at approximately 175°C. Its 12-lead MSOP package features an exposed pad (Pin 13) soldered to PCB ground, achieving θJA = 40°C/W for reliable thermal performance in under-hood or high-ambient environments.
How does the LTC3245HMSE#PBF select between 2:1, 1:1, and 1:2 charge-pump modes?
The LTC3245HMSE#PBF uses two internal comparators with load-current-proportional hysteresis to automatically select the optimal conversion ratio: 2:1 when VIN > 2×VOUT, 1:1 when VOUT < VIN ≤ 2×VOUT, and 1:2 when VIN < VOUT. This dynamic switching maintains regulation across wide input and load variations without external control.
Can the LTC3245HMSE#PBF generate an adjustable output voltage, and how is it configured?
Yes, the LTC3245HMSE#PBF supports adjustable output from 2.5V to 5V via the OUTS/ADJ pin. Configure by setting SEL2 = LOW and SEL1 = HIGH, then connecting OUTS/ADJ to a resistor divider between VOUT and GND. The internal 1.200V reference enables precise programming using RA/RB = (VOUT/1.2V) – 1.
What is the purpose of the PGOOD pin on the LTC3245HMSE#PBF, and how should it be used?
The PGOOD pin on the LTC3245HMSE#PBF is an open-drain output that goes high-impedance when VOUT reaches ≥95% of its regulation voltage and pulls low when VOUT drops ≤91%. It must be pulled up externally (e.g., to VOUT) with a resistor to signal valid power; adding an RC filter can delay assertion for sequencing purposes.
Does the LTC3245HMSE#PBF require external components beyond the flying capacitor and output capacitor?
Yes-the LTC3245HMSE#PBF requires three external ceramic capacitors: one 1µF flying capacitor (CFLY) between C+ and C–, one 10µF low-ESR output capacitor (COUT) from VOUT to GND, and one 1µF input capacitor (CIN) from VIN to GND. No inductors, diodes, or compensation networks are needed, minimizing BOM count and layout complexity.
LTC3245HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3245HMSE#PBF FAQ
1.How can I place an order for LTC3245HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3245HMSE#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 LTC3245HMSE#PBF reliable?
The price and inventory of LTC3245HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3245HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3245HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3245HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3245HMSE#PBF?
LTC3245HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3245HMSE#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 LTC3245HMSE#PBF?
For technical support, including LTC3245HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3245HMSE#PBF requirements.
6.How does Aetrix verify that LTC3245HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3245HMSE#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 LTC3245HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3245HMSE#PBF?
All LTC3245HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3245HMSE#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 LTC3245HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3245HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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