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Analog Devices Inc. LTC3246EMSE#PBF
- Part No.:
- LTC3246EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3246EMSE#PBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,893
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Product details
Overview
LTC3246EMSE#PBF from Analog Devices is a switched-capacitor buck-boost DC/DC converter with integrated watchdog timer and reset controller. It delivers regulated 3.3V, 5V, or adjustable (2.5V–5V) output from 2.7V–38V input, supports up to 500mA load, operates with 20µA quiescent current, and features automatic 2:1/1:1/1:2 mode switching - used in automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3246EMSE#PBF datasheet, LTC3246EMSE#PBF pinout, LTC3246EMSE#PBF application, or LTC3246EMSE#PBF equivalent, key selection criteria include wide-input voltage range, ultralow EMI, windowed watchdog timing, pushbutton reset capability, and thermally enhanced MSOP-16 packaging for high-reliability diagnostics in ISO 26262 systems.
Technical Context
The LTC3246EMSE#PBF implements fractional charge-pump conversion using a single flying capacitor and internal switch matrix to achieve regulation across three modes: 2:1 step-down (VIN > 2×VOUT), 1:1 step-down (VOUT < VIN ≤ 2×VOUT), and 1:2 step-up (VIN < VOUT). Mode selection is fully automatic and optimized for efficiency under varying input and load conditions.
Its integrated POR/watchdog controller provides dual-timing functions: reset timeout (150–270ms internal, adjustable via RT pin) and windowed watchdog (37.5–2.2s internal, adjustable via WT pin), with independent WDI and RSTI inputs enabling system-level fault detection and manual reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 38V - enables direct connection to 12V/24V automotive rails and unregulated industrial supplies without pre-regulation. |
| Output Voltage Options | Fixed 3.3V or 5V, or adjustable 2.5V–5V - selected via SEL1/SEL2 logic pins; eliminates external feedback resistors for standard outputs. |
| Max Output Current | 500mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained designs. |
| Quiescent Current | 20µA operating / 1.5µA shutdown - extends battery life in always-on automotive and IoT monitoring applications. |
| Charge Pump Modes | Automatic 2:1, 1:1, 1:2 switching - maintains regulation and peak efficiency (>81% at 12V→5V/500mA) without inductors or manual configuration. |
| Watchdog Function | Windowed timeout (37.5ms–2.2s internal, adjustable externally) - detects both stuck-high and stuck-low WDI signals for robust system health monitoring. |
| Thermal Rating | –40°C to 125°C junction (E-grade) - qualified for under-hood automotive and industrial environments with derating guidance provided. |
Pinout & Package
The LTC3246EMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), requiring soldering to PCB ground plane for thermal performance and functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WT (1) | Watchdog Timer Control | Connects external capacitor to set upper watchdog timeout boundary; tie to BIAS for ~1.6s internal timeout. |
| RT (2) | Reset Timeout Control | Connects external capacitor to set reset timeout period; tie to BIAS for ~200ms internal timeout. |
| RSTI (3) | Reset Input Comparator | Monitors external voltage against 1.2V threshold; initiates reset when below threshold and holds until timeout completes. |
| BIAS (4,8) | Internal Bias Reference | Provides internal reference; must be bypassed with ≥10µF ceramic capacitor - not for external loading. |
| SEL2 (5) | Mode Selection Logic | Combined with SEL1, selects output mode (shutdown, adjustable, 5V, or 3.3V); tolerates 38V input, pull-down enabled. |
| VIN (6,9) | Main Power Input | Accepts 2.7V–38V supply; both pins must be connected and bypassed with ≥1µF ceramic capacitor. |
| SEL1 (7) | Mode Selection Logic | Paired with SEL2 per Table 1; high-impedance input with 1µA pull-down, 38V tolerant. |
| WDI (10) | Watchdog Input | Falling-edge-triggered; must toggle 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 permitted. |
| VOUT (12) | Regulated Output | Delivers configured output (3.3V/5V/adjustable); capable of 500mA continuous; short-circuit protected. |
| C– (13) | Flying Capacitor Negative | Connects only to negative terminal of CFLY; no external loading permitted. |
| 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. |
| OUTS/ADJ (16) | Output Sense / Adjust Input | Serves as VOUT sense for fixed outputs or ADJ node for resistor divider in adjustable mode; regulates to 1.1V in ADJ mode. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Uses single 2.2µF flying capacitor and ceramic output caps - eliminates magnetic EMI, simplifies layout, reduces board area vs inductor-based solutions. |
| Ultralow EMI emissions | Switched-capacitor operation inherently avoids high-di/dt switching nodes - meets stringent automotive EMC requirements without shielding or filtering. |
| ISO 26262 diagnostic coverage | Engineered with built-in fault detection (VOUT OV/UV, thermal, short-circuit), watchdog windowing, and deterministic reset behavior - supports ASIL-B system integration. |
| Integrated pushbutton reset | RSTI pin accepts manual switch closure to ground - enables user-initiated system reset without additional logic or microcontroller intervention. |
| Thermally enhanced MSOP | 16-lead MSOP with exposed GND pad (θJA = 40°C/W) - enables reliable 500mA operation in compact automotive and industrial enclosures. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit with 12V/24V battery input subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing stable 5V rail; watchdog monitors MCU activity; RSTI enables fail-safe reset on brownout. Use Value: Wide 2.7V–38V input handles cold-crank dips and load-dump spikes; 500mA output supports full ECU subsystem; windowed watchdog prevents silent failures. | Use Scenario: Supplies auxiliary 3.3V rail for FPGA configuration, I²C peripherals, and real-time clock in telecom base station shelf management controller. IC Role / Device Role / Timing Role: Secondary housekeeping regulator; RT-configured reset ensures clean boot after power restoration; SEL pins hardwire fixed 3.3V output. Use Value: 20µA quiescent current minimizes standby loss; 125°C rating supports operation near hot ASICs; no inductor eases compliance with vibration standards. |
| Low-Power 12V-to-5V Conversion | Diagnostic Monitoring Node |
Use Scenario: Converts 12V vehicle bus to regulated 5V for battery-backed memory and tamper-detection circuitry in telematics gateway. IC Role / Device Role / Timing Role: Efficient 12V→5V converter with automatic mode switching; WDI driven by MCU heartbeat; RST drives memory write-protect enable. Use Value: 81% efficiency at 500mA reduces thermal stress; adjustable watchdog window accommodates variable MCU task timing; low shutdown current preserves battery. | Use Scenario: Powers isolated analog front-end and ADC in predictive maintenance sensor node deployed in harsh factory environments. IC Role / Device Role / Timing Role: Primary supply with integrated watchdog and reset; BIAS pin supplies precision reference; OUTS/ADJ used for 2.7V adjustable rail. Use Value: Overtemperature and short-circuit protection ensure field reliability; 150°C max junction temperature supports high-ambient deployments; diagnostic-ready architecture simplifies functional safety certification. |
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 |
|---|---|---|---|
| LTC3265EMSE#PBF | Lower max input (12V), includes LDO post-regulator and dual charge pumps; no integrated watchdog or windowed timing. | Better suited for low-noise analog biasing; lacks automotive-grade watchdog and wide-VIN capability. | Select when ultra-low noise and dual-rail generation outweigh need for 38V input and ISO 26262 diagnostics. |
| MAX17524ATP+T | Inductor-based synchronous buck-boost; 4.5V–60V input; no integrated watchdog or reset logic; higher EMI. | Higher efficiency at high loads (>1A); requires magnetics and more complex layout; no native reset supervision. | Select when >1A output or tighter regulation tolerance (<±1%) is required, and external watchdog IC can be added. |
Compared with LTC3265EMSE#PBF and MAX17524ATP+T, the LTC3246EMSE#PBF uniquely combines 38V input capability, no-inductor design, windowed watchdog, and automotive temperature grade in a single MSOP-16 package - making it optimal for space- and reliability-constrained 500mA housekeeping rails.
Availability
LTC3246EMSE#PBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial housekeeping systems, and low-power 12V-to-5V conversion requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3246EMSE#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving automotive, industrial, communications, and healthcare markets.
The LTC3246 belongs to ADI's Power by Linear™ family of highly integrated DC/DC converters designed specifically for diagnostic-critical, wide-input automotive and industrial applications where reliability, small size, and low EMI are mandatory.
FAQ
What output voltage options does the LTC3246EMSE#PBF support?
The LTC3246EMSE#PBF supports three output configurations: fixed 5V (SEL2=HIGH, SEL1=LOW), fixed 3.3V (SEL2=HIGH, SEL1=HIGH), or adjustable 2.5V–5V (SEL2=LOW, SEL1=HIGH) via external resistor divider on the OUTS/ADJ pin. All modes are selected solely by logic levels on SEL1/SEL2 - no external components needed for fixed outputs. The LTC3246EMSE#PBF maintains regulation across its full 2.7V–38V input range in each mode.
How does the LTC3246EMSE#PBF implement watchdog functionality?
The LTC3246EMSE#PBF uses a windowed watchdog architecture: WDI falling edges must occur between tWDL (lower boundary, e.g., 37.5ms) and tWDU (upper boundary, e.g., 2.2s) to prevent RST assertion. Boundaries are set internally or via CWT capacitor on WT pin. This prevents false resets from stuck signals and detects both frozen and runaway firmware - a requirement for ISO 26262 ASIL-B systems. The LTC3246EMSE#PBF also allows disabling the watchdog by grounding both WT and WDI.
Can the LTC3246EMSE#PBF operate without external timing capacitors?
Yes - the LTC3246EMSE#PBF provides internal default timing: ~200ms reset timeout (tRST(INT)) when RT is tied to BIAS, and ~1.6s watchdog upper boundary (tWDU(INT)) when WT is tied to BIAS. External capacitors on RT and WT pins are optional for precise adjustment. The LTC3246EMSE#PBF requires no external timing components to function, simplifying BOM and layout while retaining full watchdog and reset capability.
What protection features are integrated into the LTC3246EMSE#PBF?
The LTC3246EMSE#PBF integrates overtemperature shutdown (trip ~175°C, restart ~165°C), output overvoltage/undervoltage reset (±5%/±9% windows), short-circuit current limiting (250mA foldback), and input undervoltage lockout (2.35V). These protections operate autonomously without host intervention. The LTC3246EMSE#PBF also includes BIAS output current limiting and thermal derating guidance to ensure long-term reliability under sustained load.
Is the LTC3246EMSE#PBF pin-compatible with other members of the LTC3246 family?
Yes - all LTC3246 variants (E/I/H/MP grades) share identical 16-lead MSOP packaging, pinout, and electrical functionality. The LTC3246EMSE#PBF (–40°C to 125°C) is functionally interchangeable with LTC3246IMSE#PBF (same temp range, different screening) and LTC3246HMSE#PBF (–40°C to 150°C), differing only in temperature qualification and test coverage. No PCB changes are required when upgrading within the family.
LTC3246EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (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:
- 500mA
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3246EMSE#PBF FAQ
1.How can I place an order for LTC3246EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3246EMSE#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 LTC3246EMSE#PBF reliable?
The price and inventory of LTC3246EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3246EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3246EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3246EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3246EMSE#PBF?
LTC3246EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3246EMSE#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 LTC3246EMSE#PBF?
For technical support, including LTC3246EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3246EMSE#PBF requirements.
6.How does Aetrix verify that LTC3246EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3246EMSE#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 LTC3246EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3246EMSE#PBF?
All LTC3246EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3246EMSE#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 LTC3246EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3246EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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