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Analog Devices Inc. LTC3246MPMSE#PBF
- Part No.:
- LTC3246MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3246MPMSE#PBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,835
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Product details
Overview
LTC3246MPMSE#PBF from Analog Devices is a thermally enhanced, wide-input-range 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 to 38V input, supports up to 500mA load, operates with zero inductors, and features multimode automatic ratio switching (2:1/1:1/1:2) for optimal efficiency across input and load variations - deployed in automotive ECU power supplies and industrial housekeeping rails.
For engineers reviewing the LTC3246MPMSE#PBF datasheet, LTC3246MPMSE#PBF pinout, LTC3246MPMSE#PBF application, or LTC3246MPMSE#PBF equivalent, this page provides verified technical context, exact pin functions, confirmed operating modes, validated thermal performance at –55°C to 150°C junction, and real-world design meaning behind key specs including VOUT ripple, reset timeout, watchdog windowing, and charge pump output impedance.
Technical Context
The LTC3246MPMSE#PBF implements a fractional switched-capacitor architecture with three dynamically selected conversion modes: 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 hysteresis govern mode transitions to maintain regulation while minimizing oscillation near boundaries.
Its integrated POR/watchdog controller uses dual independent timing paths: RT pin sets reset timeout (14–28ms with 2.2nF), WT pin configures watchdog upper/lower boundaries (100–220ms external, 37.5ms–2.2s internal), and WDI accepts falling-edge-triggered watchdog pulses with strict timing windows to prevent false resets in safety-critical systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 38V - supports direct connection to 12V/24V automotive batteries and industrial rails without pre-regulation. |
| Output Current | Up to 500mA - sufficient for powering CAN transceivers, microcontrollers, and sensor interfaces in space-constrained designs. |
| Quiescent Current | 20µA operating / 1.5µA shutdown - enables always-on monitoring in low-power diagnostic systems. |
| 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 Junction Temp | –55°C to 150°C - qualified for extended-temperature automotive and harsh-environment industrial use (MP-grade). |
| Charge Pump Output Impedance | 1Ω (2:1 mode), 1.2Ω (1:1 mode), 4–8Ω (1:2 mode) - defines minimum load capability and dropout behavior under low-VIN conditions. |
| VOUT Ripple | 50mV p-p (COUT = 10µF), 25mV p-p (COUT = 22µF) - determines required output capacitance for noise-sensitive analog or RF subsystems. |
Pinout & Package
Package: 16-lead plastic MSOP with exposed thermal pad (Pin 17 = GND), rated for 150°C max junction temperature and 40°C/W θJA. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WT (Pin 1) | Watchdog Timer Control | Connects external capacitor to set watchdog timeout; tied to BIAS for ~1.6s internal timeout; grounding disables watchdog. |
| RT (Pin 2) | Reset Timeout Control | Accepts external capacitor to program reset delay (14–28ms with 2.2nF); tied to BIAS for ~200ms internal timeout. |
| RSTI (Pin 3) | Reset Input Comparator | Compares against 1.2V threshold; drives RST low when asserted; must be actively driven - not floatable. |
| BIAS (Pins 4, 8) | Internal Bias Reference | Supplies internal circuitry only; requires ≥10µF ceramic bypass to GND; no external loading permitted. |
| SEL2 (Pin 5) | Mode Selection Logic | With SEL1, selects output mode per Table 1: LOW/LOW = shutdown, HIGH/LOW = 5V, HIGH/HIGH = 3.3V, LOW/HIGH = adjustable. |
| VIN (Pins 6, 9) | Main Power Input | Accepts 2.7V–38V; all VIN pins must be shorted and bypassed with ≥1µF ceramic capacitor. |
| SEL1 (Pin 7) | Mode Selection Logic | Paired with SEL2 to configure output voltage and enable/disable charge pump; tolerates 38V inputs. |
| WDI (Pin 10) | Watchdog Input | Falling-edge-triggered; must pulse within watchdog window (e.g., 100–220ms) to prevent RST assertion. |
| C+ (Pin 11) | Flying Capacitor Positive | Connects only to positive terminal of external flying capacitor (CFLY); no external drive or load allowed. |
| VOUT (Pin 12) | Regulated Output | Delivers configured output (3.3V/5V/adjustable); capable of 500mA continuous; requires ≥10µF low-ESR ceramic output cap. |
| C– (Pin 13) | Flying Capacitor Negative | Connects only to negative terminal of CFLY; no external connections beyond flying capacitor. |
| RST (Pin 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 (Pins 15, 17) | Ground Reference | Pins 15 and 17 (exposed pad) are both GND; exposed pad must be soldered to PCB ground plane for thermal performance. |
| OUTS/ADJ (Pin 16) | VOUT Sense / Feedback Input | Serves as output sense for fixed outputs; functions as ADJ node (1.1V reference) for adjustable mode with external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI emissions | No inductor required - eliminates magnetic field radiation and simplifies EMC compliance in dense PCB layouts. |
| Windowed watchdog function | Enforces strict lower/upper timing bounds on WDI pulses - prevents false resets due to noise or jitter in safety-critical ISO 26262 systems. |
| Automatic multimode buck-boost | Seamlessly switches between 2:1, 1:1, and 1:2 charge pump ratios based on VIN and load - maintains regulation without manual configuration. |
| Engineered for ISO 26262 diagnostic coverage | Incorporates built-in fault detection (overvoltage, overtemperature, short-circuit) and watchdog logic - reduces ASIL decomposition effort in automotive functional safety designs. |
| Thermally enhanced MSOP package | Exposed pad + 40°C/W θJA enables reliable 500mA operation at 150°C junction - suitable for under-hood and industrial control cabinet environments. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit with 12V battery input subject to cold cranking (down to 2.7V) and load dump (up to 38V). IC Role / Device Role / Timing Role: Primary buck-boost regulator with integrated watchdog and reset - replaces discrete LDO + external reset IC + watchdog timer. Use Value: Single-chip solution eliminates inductor, reduces BOM count by ≥4 components, and meets AEC-Q100 Grade 1 thermal requirements (–40°C to 125°C ambient). |
Use Scenario: Generates stable 5V rail for PLC I/O modules, fieldbus gateways, and telemetry controllers operating from 24V industrial supply with brownout risk. IC Role / Device Role / Timing Role: Housekeeping DC/DC converter with programmable reset timeout and supply monitoring - ensures deterministic recovery after power interruption. Use Value: 20µA quiescent current extends backup battery life; adjustable VOUT supports legacy 3.3V logic; MP-grade temp range covers uncontrolled cabinet environments. |
| Low-Power 12V-to-5V Conversion | Diagnostic Monitoring System |
Use Scenario: Converts 12V vehicle bus to 5V for USB-C PD controller, display backlight driver, or infotainment MCU in parking mode. IC Role / Device Role / Timing Role: Efficient inductorless regulator with shutdown control - enables ultra-low standby power via SEL1/SEL2 logic. Use Value: 1.5µA shutdown current minimizes battery drain; 81% efficiency at 12V→5V/500mA reduces thermal stress in sealed enclosures. |
Use Scenario: Monitors system health in railway signaling or medical device power management, asserting reset if host fails to refresh watchdog within defined window. IC Role / Device Role / Timing Role: Dual-function watchdog + reset supervisor - provides fail-safe response to software lockup or communication loss. Use Value: Windowed timing prevents spurious resets from transient noise; RSTI input allows external supply monitoring; MP-grade qualification supports long-life deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3245IMSE#PBF | Lacks integrated watchdog timer; same 2.7V–38V input, 500mA output, and multimode charge pump architecture. | Requires external watchdog IC for safety-critical monitoring; suitable where reset supervision is handled separately. | Select when watchdog functionality is unnecessary or implemented externally - reduces cost and complexity where diagnostics are centralized. |
| MAX17504ATP+T | Inductor-based synchronous buck-boost; wider 4.5V–60V input; higher 2A output; no integrated watchdog or reset timer. | Needs external components for reset/watchdog; better suited for high-current, high-efficiency applications where EMI constraints allow inductors. | Choose for >500mA loads or input voltages exceeding 38V; avoid when inductor-free design or integrated timing is mandatory. |
Compared with LTC3245IMSE#PBF and MAX17504ATP+T, the LTC3246MPMSE#PBF uniquely integrates watchdog timing, reset control, and inductorless buck-boost in a single MP-grade package - eliminating external timing components and enabling compact, certified functional safety implementations without layout compromises.
Availability
LTC3246MPMSE#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-lifecycle programs.
Supply support for LTC3246MPMSE#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 power management semiconductors, serving automotive, industrial, communications, and healthcare markets with precision, reliability, and safety-certified solutions.
The LTC3246MPMSE#PBF belongs to ADI's Power by Linear™ family of highly integrated DC/DC converters engineered for demanding automotive and industrial applications where wide input range, low EMI, and functional safety features are critical.
FAQ
What is the operating temperature range of the LTC3246MPMSE#PBF?
The LTC3246MPMSE#PBF is tested and guaranteed over a junction temperature range of –55°C to 150°C, making it suitable for under-hood automotive and harsh industrial environments. This MP-grade qualification exceeds standard industrial (–40°C to 125°C) and automotive (–40°C to 125°C) grades, with thermal protection engaging above ~175°C to prevent damage during overload.
How does the LTC3246MPMSE#PBF select its charge pump conversion mode?
The LTC3246MPMSE#PBF automatically selects between 2:1 step-down, 1:1 step-down, and 1:2 step-up modes using internal comparators that monitor VIN relative to VOUT. Mode transitions include hysteresis to prevent oscillation near boundaries, and the selection optimizes efficiency across varying input voltage and load conditions without external intervention.
Can the LTC3246MPMSE#PBF be used without external timing capacitors?
Yes - the LTC3246MPMSE#PBF supports internal timing defaults: tying RT to BIAS yields ~200ms reset timeout, and tying WT to BIAS yields ~1.6s watchdog timeout. External capacitors (CRT, CWT) are optional for precise adjustment; grounding both WT and WDI disables the watchdog entirely.
What protection features are integrated into the LTC3246MPMSE#PBF?
The LTC3246MPMSE#PBF includes overtemperature shutdown (trip ~175°C), short-circuit current limiting on VOUT and BIAS, and VOUT overvoltage/undervoltage reset detection (±5% to ±9% window). These protections operate autonomously without external components, enhancing system robustness in unattended or safety-critical deployments.
How is the output voltage configured on the LTC3246MPMSE#PBF?
The LTC3246MPMSE#PBF output voltage is selected via SEL1 and SEL2 logic pins: LOW/HIGH = adjustable (2.5V–5V), HIGH/LOW = fixed 5V, HIGH/HIGH = fixed 3.3V, LOW/LOW = shutdown. For adjustable mode, OUTS/ADJ is biased to 1.1V and connected to a resistor divider; for fixed outputs, OUTS/ADJ is shorted to VOUT.
LTC3246MPMSE#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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3246MPMSE#PBF FAQ
1.How can I place an order for LTC3246MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3246MPMSE#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 LTC3246MPMSE#PBF reliable?
The price and inventory of LTC3246MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3246MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3246MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3246MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3246MPMSE#PBF?
LTC3246MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3246MPMSE#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 LTC3246MPMSE#PBF?
For technical support, including LTC3246MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3246MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3246MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3246MPMSE#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 LTC3246MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3246MPMSE#PBF?
All LTC3246MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3246MPMSE#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 LTC3246MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3246MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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