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Analog Devices Inc. LTC3246EMSE#TRPBF
- Part No.:
- LTC3246EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3246EMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,616
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Product details
Overview
LTC3246EMSE#TRPBF 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 multimode charge pump (2:1/1:1/1:2) selection-ideal for automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3246EMSE#TRPBF datasheet, LTC3246EMSE#TRPBF pinout, LTC3246EMSE#TRPBF application, or LTC3246EMSE#TRPBF equivalent, key selection criteria include wide-input-voltage operation (2.7V–38V), ultralow EMI without inductors, windowed watchdog timing, pushbutton reset capability, and ISO 26262 diagnostic coverage support.
Technical Context
The LTC3246EMSE#TRPBF implements fractional switched-capacitor conversion using a single external flying capacitor to achieve 2:1 step-down, 1:1 pass-through, or 1:2 step-up modes-automatically selected based on VIN–VOUT relationship and load. Its internal mode control logic includes hysteresis to prevent oscillation at transition boundaries.
It integrates dual independent timing circuits: an RT-pin-controlled reset timer (14–28ms with 2.2nF) and a WT-pin-configurable watchdog with windowed timeout (37.5ms–2.2s). The RSTI pin enables external supply monitoring, while WDI accepts falling-edge-triggered watchdog refresh signals with strict lower/upper boundary timing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 38V - supports direct connection to 12V/24V automotive rails and unregulated industrial supplies without pre-regulation. |
| Output Current | Up to 500mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained systems. |
| Quiescent Current | 20µA operating / 1.5µA shutdown - enables always-on functionality in battery-backed or low-power wake-up applications. |
| Output Voltage Options | Fixed 3.3V or 5V, or adjustable 2.5V–5V via resistor divider - provides flexibility across logic families and legacy interface requirements. |
| Charge Pump Modes | Automatic 2:1, 1:1, 1:2 switching - maintains regulation across full input range without external mode control or inductor selection. |
| Watchdog Window | Configurable lower/upper timeout boundaries (e.g., 100ms/220ms with 2.2nF CWT) - prevents spurious resets while detecting stuck firmware. |
| Thermal Rating | 150°C max junction temperature (E-grade) - validated for under-hood automotive environments and high-ambient industrial enclosures. |
Pinout & Package
Package: 16-lead thermally enhanced MSOP with exposed GND pad (Pin 17), requiring PCB soldering for thermal performance and electrical integrity.
| 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 | Accepts external capacitor to program reset timeout (e.g., 21ms typical with 2.2nF); tie to BIAS for ~200ms internal timeout. |
| RSTI (3) | Reset Input Comparator | Monitors external voltage vs 1.2V threshold; asserts 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-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 input; both pins must be connected and bypassed with ≥1µF ceramic capacitor per pin. |
| SEL1 (7) | Mode Selection Logic | See SEL2; high-impedance input tolerant to 38V, with 1µA pull-down-enables direct VIN pin-strapping. |
| WDI (10) | Watchdog Input | Falling-edge-triggered refresh signal; must fall within watchdog window (e.g., 100–220ms) to prevent RST assertion. |
| C+ (11) | Flying Capacitor Positive | Connects only to positive terminal of external flying capacitor (CFLY); no external circuitry allowed. |
| VOUT (12) | Regulated Output | Delivers up to 500mA; internally shorted to OUTS/ADJ in fixed-output modes; requires ≥10µF low-ESR ceramic output capacitor. |
| C– (13) | Flying Capacitor Negative | Connects only to negative terminal of CFLY; no external connections or 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 Reference | Pins 15 and exposed pad (17) are common GND; exposed pad must be soldered to PCB ground plane for thermal and electrical performance. |
| OUTS/ADJ (16) | Output Sense / Adjust Input | Serves as VOUT feedback node (fixed modes) or ADJ reference (1.11V typical) for resistor-divider programming of adjustable outputs. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components and associated EMI filters-reduces board area by >30% vs inductor-based solutions. |
| Ultralow EMI emissions | Meets CISPR 25 Class 5 limits without shielding or ferrites-critical for automotive infotainment and ADAS subsystems. |
| ISO 26262 diagnostic coverage | Engineered for ASIL-B system integration with built-in watchdog windowing, overvoltage/undervoltage reset detection, and fault reporting paths. |
| Thermal and fault protection | Includes overtemperature shutdown (175°C trip), short-circuit current limiting (250mA foldback), and overvoltage reset (108.5% VOUT). |
| Pushbutton reset configuration | RSTI pin doubles as manual reset input-enables hardware-initiated recovery without MCU intervention or additional logic. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit under cold-crank (4.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary 5V housekeeping regulator with watchdog supervision and reset coordination for safety-critical firmware. Use Value: Maintains regulation across 2.7V–38V input without pre-regulator; windowed watchdog prevents false resets during transient events. |
Use Scenario: Generates stable 3.3V supply for PLC I/O modules and fieldbus controllers in telecom cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Low-quiescent-current buck-boost converter with thermal derating support up to 150°C junction temperature. Use Value: 20µA operating current extends backup battery life; 16-lead MSOP package fits dense backplane layouts. |
| Low-Power 12V-to-5V Conversion | Adjustable Sensor Bias Supply |
Use Scenario: Replaces linear regulators in battery-powered test equipment requiring efficient 12V-to-5V conversion with minimal heat dissipation. IC Role / Device Role / Timing Role: Inductorless DC/DC converter delivering 500mA at 81% efficiency (12V→5V), with programmable reset timeout. Use Value: Eliminates heatsink requirement; 1.5µA shutdown current preserves battery charge during storage. |
Use Scenario: Provides precision-adjustable bias voltage (2.5V–5V) for analog front-ends in medical instrumentation with calibration flexibility. IC Role / Device Role / Timing Role: Adjustable-output charge pump with 1.11V internal reference and resistor-divider programming (±1% VOUT accuracy). Use Value: Enables single-BOM support for multiple sensor types; OUTS/ADJ pin serves as accurate feedback node in all configurations. |
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 |
|---|---|---|---|
| LTC3265EMSE#TRPBF | Lower input range (4.5V–32V), dual output (±VOUT), no integrated watchdog timer, higher IQ (45µA) | Targeted at precision bipolar supply generation-not suitable for standalone watchdog-monitored single-rail applications | Select only if dual-rail output and ± regulation are required; omit if watchdog or wide VIN (2.7V) is mandatory. |
| MAX17521ATP+T | Inductor-based synchronous buck-boost, 4.5V–60V input, 3A output, no integrated watchdog or reset timer | Higher power, higher EMI, requires inductor and compensation network-suited for non-space-constrained industrial SMPS | Choose when >500mA output or >38V input is needed; avoid when inductor-free design or embedded watchdog is required. |
Compared with LTC3246EMSE#TRPBF, LTC3265EMSE#TRPBF lacks watchdog functionality and starts at 4.5V input, while MAX17521ATP+T requires magnetics and offers no reset supervision-making LTC3246EMSE#TRPBF uniquely suited for compact, safety-aware, inductorless 500mA housekeeping rails.
Availability
LTC3246EMSE#TRPBF 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, long-term lifecycle assurance, and AEC-Q200-aligned reliability.
Supply support for LTC3246EMSE#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 technologies, serving automotive, industrial, communications, and healthcare markets with robust, application-optimized ICs.
The LTC3246 belongs to ADI's Power by Linear™ family of highly integrated DC/DC converters designed specifically for space-constrained, high-reliability applications demanding wide-input operation, low EMI, and functional safety features.
FAQ
What input voltage range does the LTC3246EMSE#TRPBF support?
The LTC3246EMSE#TRPBF supports an input voltage range of 2.7V to 38V, with absolute maximum rating of 42V. This allows direct connection to automotive batteries during cold-crank (down to ~4.5V) and load-dump events (up to 42V), and accommodates unregulated industrial 24V rails. Operation below 2.7V disables regulation; above 38V triggers overvoltage protection.
How does the LTC3246EMSE#TRPBF select its charge pump operating mode?
The LTC3246EMSE#TRPBF automatically selects between 2:1 step-down, 1:1 pass-through, and 1:2 step-up modes based on real-time comparison of VIN and VOUT, plus load conditions. Internal comparators with hysteresis determine the optimal ratio-e.g., 2:1 activates when VIN > 2×VOUT-to maximize efficiency while maintaining regulation without external control.
Can the LTC3246EMSE#TRPBF generate an adjustable output voltage?
Yes, the LTC3246EMSE#TRPBF supports adjustable output from 2.5V to 5V using the OUTS/ADJ pin in conjunction with an external resistor divider. When SEL1 = HIGH and SEL2 = LOW, the device regulates the divider's tap point to 1.11V (typical), enabling precise VOUT programming. Fixed 3.3V and 5V outputs are selected via SEL pin combinations per Table 1 in the datasheet.
What is the purpose of the windowed watchdog function in the LTC3246EMSE#TRPBF?
The windowed watchdog in the LTC3246EMSE#TRPBF requires WDI falling edges to occur within a defined time window-neither too early nor too late-to prevent false resets. For example, with 2.2nF on WT, the window is ~100ms to ~220ms. This detects both frozen firmware (no edges) and runaway code (excessively frequent edges), enhancing reliability in safety-critical automotive and industrial systems.
Does the LTC3246EMSE#TRPBF require external inductors?
No, the LTC3246EMSE#TRPBF is a switched-capacitor (charge pump) DC/DC converter and requires only one external flying capacitor (typically 2.2µF) and standard input/output ceramic capacitors. It eliminates inductors entirely, reducing EMI, board area, and bill-of-materials cost-making it ideal for compact, noise-sensitive applications where magnetic components are undesirable.
LTC3246EMSE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3246EMSE#TRPBF FAQ
1.How can I place an order for LTC3246EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3246EMSE#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 LTC3246EMSE#TRPBF reliable?
The price and inventory of LTC3246EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3246EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3246EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3246EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3246EMSE#TRPBF?
LTC3246EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3246EMSE#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 LTC3246EMSE#TRPBF?
For technical support, including LTC3246EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3246EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3246EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3246EMSE#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 LTC3246EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3246EMSE#TRPBF?
All LTC3246EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3246EMSE#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 LTC3246EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3246EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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