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Analog Devices Inc. LTC3246MPMSE#TRPBF
- Part No.:
- LTC3246MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3246MPMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,661
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Product details
Overview
LTC3246MPMSE#TRPBF from Analog Devices is a wide-input-range switched-capacitor buck-boost DC/DC converter with integrated watchdog timer and reset controller. It delivers regulated 5V, 3.3V, or adjustable (2.5V–5V) output from 2.7V to 38V input, supports up to 500mA load, operates with zero inductors, and features multimode automatic ratio selection (2:1, 1:1, 1:2) for automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3246MPMSE#TRPBF datasheet, LTC3246MPMSE#TRPBF pinout, LTC3246MPMSE#TRPBF application, or LTC3246MPMSE#TRPBF equivalent, key selection criteria include its –55°C to 150°C MP-grade operating range, ultralow 20µA quiescent current, windowed watchdog function, and programmable reset timeout without external resistors-critical for ISO 26262 diagnostic coverage in safety-critical systems.
Technical Context
The LTC3246MPMSE#TRPBF implements fractional charge-pump conversion using internal switch matrices to dynamically select between 2:1 step-down, 1:1 step-down, and 1:2 step-up modes based on real-time VIN–VOUT relationship and load conditions. Its control loop regulates output by sensing OUTS/ADJ and modulating charge transfer timing per cycle.
It integrates dual independent timing circuits: an RT pin-controlled reset timer (14–28ms with 2.2nF) and a WT pin-controlled windowed watchdog (lower boundary 37.5–68ms, upper 1.2–2.2s internally; externally adjustable via CWT). Both timers reference internal 2.2V thresholds and support high-reliability fail-safe sequencing in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 38V (42V absolute max); enables direct connection to 12V/24V automotive batteries and industrial rails without pre-regulation. |
| Output Current | Up to 500mA continuous; sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained designs. |
| Quiescent Current | 20µA operating, 1.5µA shutdown; minimizes battery drain in always-on vehicle modules and remote IoT nodes. |
| Output Voltage Options | Fixed 3.3V or 5V, or adjustable 2.5V–5V via resistor divider on OUTS/ADJ; eliminates need for external feedback components in standard configurations. |
| Operating Temp Range | –55°C to +150°C junction (MP-grade); qualified for under-hood automotive and harsh industrial environments. |
| Protection Features | Overtemperature shutdown (175°C), short-circuit foldback (250mA), overvoltage reset (106–109% VOUT), undervoltage reset (93–99% VOUT); ensures robust fault recovery without external supervision. |
| EMI Performance | Ultralow EMI emissions due to capacitor-based topology and absence of magnetic components; simplifies EMC compliance in noise-sensitive applications. |
Pinout & Package
Package: 16-lead thermally enhanced MSOP with exposed GND pad (Pin 17), requiring soldering to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WT (1) | Watchdog Timer Control | Connect external capacitor to set watchdog timeout; tie to BIAS for ~1.6s internal timeout; grounding disables watchdog. |
| RT (2) | Reset Timeout Control | Capacitor sets reset duration (14–28ms with 2.2nF); tie to BIAS for ~200ms internal timeout. |
| RSTI (3) | Reset Input Comparator | Monitors external voltage vs 1.2V threshold; triggers reset if below threshold, enabling supply monitoring or pushbutton reset. |
| BIAS (4,8) | Internal Bias Reference | Provides internal reference; must be bypassed with ≥10µF ceramic capacitor-no external loading permitted. |
| SEL2 (5) | Mode Selection Logic | Combined with SEL1, selects output mode: LOW/LOW = shutdown, HIGH/LOW = 5V, HIGH/HIGH = 3.3V, LOW/HIGH = adjustable. |
| VIN (6,9) | Main Power Input | Accepts 2.7V–38V; both pins must be connected and bypassed with ≥1µF ceramic capacitor for stability. |
| SEL1 (7) | Mode Selection Logic | See SEL2; tolerant to 38V inputs and includes 1µA pull-down for direct VIN strapping. |
| WDI (10) | Watchdog Input | Falling-edge-triggered; must be toggled within watchdog window to prevent RST assertion; high-impedance, must not float. |
| C+ (11) | Flying Capacitor Positive | Connects only to positive terminal of external flying capacitor (CFLY); no external loading or driving. |
| VOUT (12) | Regulated Output | Delivers configured output (3.3V/5V/adjustable); requires ≥10µF low-ESR ceramic output capacitor. |
| C– (13) | Flying Capacitor Negative | Connects only to negative terminal of CFLY; no external loading or driving. |
| RST (14) | Open-Drain Reset Output | Active-low during reset; high-impedance during watchdog period; requires external pull-up to VOUT or low-voltage rail. |
| GND (15,17) | Ground / Exposed Pad | Primary ground return; exposed pad (Pin 17) is GND and must be soldered to PCB ground plane for thermal and electrical performance. |
| OUTS/ADJ (16) | Output Sense / Adjust Input | Serves as VOUT feedback for fixed outputs or ADJ node for resistor-divider programming; regulates to 1.1V in adjustable mode. |
Key Features
| Feature | Design Value |
|---|---|
| Multimode Buck-Boost Charge Pump | Automatically switches between 2:1, 1:1, and 1:2 ratios to maintain regulation across 2.7V–38V input while optimizing efficiency-no manual mode selection required. |
| Integrated Windowed Watchdog | Provides dual-boundary timing (e.g., 37.5ms–2.2s) to detect both stuck and excessively fast WDI signals-essential for ASIL-B/C diagnostic coverage per ISO 26262. |
| Programmable Reset Without Resistors | Uses RT and WT pins with capacitors only-eliminates precision resistors, reduces BOM count, and avoids drift-related timing errors in temperature-varying environments. |
| MP-Grade Temperature Rating | Guaranteed and tested from –55°C to +150°C junction, enabling deployment in engine compartments, powertrain modules, and industrial motor drives without derating. |
| Ultralow Quiescent Current | 20µA operating current allows >10-year battery life in always-on telematics and sensor nodes when paired with low-leakage output capacitors. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and EEPROM in engine control unit located near hot exhaust manifold. IC Role / Device Role / Timing Role: Primary 5V housekeeping regulator with integrated watchdog and reset for fail-safe boot sequencing and runtime supervision. Use Value: Eliminates inductor, reduces EMI, and sustains operation at 150°C ambient-enabling compact placement directly on ECU board without heatsink. | Use Scenario: Supplies 3.3V logic rail for PLC I/O modules operating in uncooled factory cabinets with 24V DC input. IC Role / Device Role / Timing Role: Fixed 3.3V buck-boost converter with programmable reset timeout for brownout recovery and watchdog supervision of fieldbus communication. Use Value: Delivers stable 3.3V at full 500mA load across 18V–36V input variation, with <25mV ripple using 22µF ceramic output cap-reducing need for secondary LDO filtering. |
| Low-Power 12V-to-5V Conversion | ISO 26262 Diagnostic Subsystem |
Use Scenario: Replaces inefficient linear regulator in battery-powered ADAS camera module requiring 5V/200mA from 12V vehicle bus. IC Role / Device Role / Timing Role: High-efficiency 12V-to-5V switched-capacitor converter with ultralow IQ and shutdown mode for sleep-state power savings. Use Value: Achieves 81% efficiency at 12V→5V/500mA, cutting power loss by >60% versus LDO-extending runtime and reducing thermal stress on adjacent image sensors. | Use Scenario: Provides supervised power and timing functions for ASIL-B safety monitor in electric power steering controller. IC Role / Device Role / Timing Role: Dual-timer IC delivering independent reset and windowed watchdog signals with diagnostic coverage metrics engineered per ISO 26262 Annex D. Use Value: Enables hardware-level fault detection (e.g., software lockup, clock failure) without MCU intervention-reducing FMEDA analysis effort and supporting ASIL decomposition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost charge pump regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3245IMSE#TRPBF | No integrated watchdog timer; identical charge-pump architecture, 2.7V–38V input, 500mA output, same MSOP package. | Suitable where system-level watchdog is implemented externally or not required; lacks windowed timing for ASIL-B diagnostics. | Select LTC3245IMSE#TRPBF only if watchdog functionality is redundant or handled elsewhere-reduces cost and complexity where safety certification is not mandated. |
| MAX17521ATP+T | Inductor-based synchronous buck-boost; 4.5V–60V input, 3.3V/5V fixed or adjustable, 600mA output; requires external inductor and compensation. | Better suited for higher-power (>500mA) or lower-noise applications where inductor size is acceptable; lacks integrated reset/watchdog logic. | Choose MAX17521ATP+T when higher output current, tighter output tolerance (<±1%), or lower ripple is required-accepting added BOM count and layout area for magnetics. |
Compared with LTC3245IMSE#TRPBF, the LTC3246MPMSE#TRPBF adds certified watchdog timing and extended –55°C operation but trades slightly higher quiescent current; versus MAX17521ATP+T, it eliminates inductors and integrates supervision logic but limits peak current to 500mA and offers less precise output regulation.
Availability
LTC3246MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial housekeeping rails, and ISO 26262 diagnostic subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3246MPMSE#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.
The LTC3246 belongs to ADI's µModule®-adjacent high-reliability power management portfolio, designed specifically for safety-critical automotive and industrial applications demanding wide-input operation, integrated supervision, and extended temperature qualification.
FAQ
What is the maximum operating junction temperature for the LTC3246MPMSE#TRPBF?
The LTC3246MPMSE#TRPBF is guaranteed and tested over a junction temperature range of –55°C to +150°C. This MP-grade rating exceeds standard automotive AEC-Q100 Grade 1 requirements and enables use in under-hood applications where ambient temperatures exceed 125°C. Thermal derating applies above 125°C, and the device includes overtemperature protection that shuts down operation above ~175°C to prevent damage.
How does the LTC3246MPMSE#TRPBF select its charge-pump conversion mode?
The LTC3246MPMSE#TRPBF automatically selects between 2:1 step-down, 1:1 step-down, and 1:2 step-up modes based on real-time comparison of VIN and the programmed VOUT. Internal comparators with hysteresis determine the optimal ratio: 2:1 when VIN > 2×VOUT, 1:1 when VOUT < VIN ≤ 2×VOUT, and 1:2 when VIN < VOUT. No external configuration is needed-the mode switching is fully transparent to the user and maintains regulation across all load conditions.
Can the LTC3246MPMSE#TRPBF generate an adjustable output voltage, and how is it configured?
Yes, the LTC3246MPMSE#TRPBF supports adjustable output from 2.5V to 5V using the OUTS/ADJ pin. To configure it, drive SEL1 high and SEL2 low, then connect a resistor divider between VOUT and GND with the tap at OUTS/ADJ. The internal reference is 1.11V, so RA/RB = (VOUT/1.11V) – 1. Select RB between 1kΩ and 1MΩ to balance accuracy and quiescent current-larger RB values reduce no-load current consumption.
What external components are required for basic operation of the LTC3246MPMSE#TRPBF?
For basic operation, the LTC3246MPMSE#TRPBF requires only three external components: a 2.2µF ceramic flying capacitor (CFLY) between C+ and C–, a ≥10µF low-ESR ceramic output capacitor (COUT) from VOUT to GND, and a ≥1µF ceramic input capacitor (CIN) from VIN to GND. Optional components include timing capacitors on RT and WT for programmable reset/watchdog, and a pull-up resistor on RST. No inductors, diodes, or feedback resistors are needed for fixed-output configurations.
Does the LTC3246MPMSE#TRPBF support pushbutton reset functionality?
Yes, the LTC3246MPMSE#TRPBF supports pushbutton reset via the RSTI pin. Connecting a momentary switch between RSTI and GND pulls RSTI below its 1.2V threshold, triggering an immediate reset pulse on the RST output. After release, the internal reset timer (set by RT pin capacitor or internal 200ms default) holds RST low for the timeout period before releasing it to high-impedance state-enabling clean system reboot without firmware involvement.
LTC3246MPMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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:
- 500mA
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3246MPMSE#TRPBF FAQ
1.How can I place an order for LTC3246MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3246MPMSE#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 LTC3246MPMSE#TRPBF reliable?
The price and inventory of LTC3246MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3246MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3246MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3246MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3246MPMSE#TRPBF?
LTC3246MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3246MPMSE#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 LTC3246MPMSE#TRPBF?
For technical support, including LTC3246MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3246MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3246MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3246MPMSE#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 LTC3246MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3246MPMSE#TRPBF?
All LTC3246MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3246MPMSE#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 LTC3246MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3246MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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