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Analog Devices Inc. LTC3246IMSE#TRPBF
- Part No.:
- LTC3246IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3246IMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,109
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Product details
Overview
LTC3246IMSE#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 in multimode (2:1/1:1/1:2) charge pump conversion, and features 20µA quiescent current - ideal for automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3246IMSE#TRPBF datasheet, LTC3246IMSE#TRPBF pinout, LTC3246IMSE#TRPBF application, or LTC3246IMSE#TRPBF equivalent, key selection criteria include input voltage range (2.7V–38V), output mode configuration via SEL1/SEL2 pins, internal watchdog timeout (1.2s–2.2s), reset timing control (14ms–28ms with external capacitor), and thermally enhanced 16-lead MSOP package with exposed GND pad.
Technical Context
The LTC3246IMSE#TRPBF implements automatic multimode charge pump control using internal comparators and hysteresis to select between 2:1 step-down, 1:1 step-down, or 1:2 step-up conversion based on real-time VIN–VOUT relationship and load conditions. Its oscillator operates at ~450kHz, and regulation is maintained by sensing OUTS/ADJ and modulating charge transfer per cycle.
It integrates dual independent timing circuits: a windowed watchdog timer (lower boundary 37.5ms, upper 2.2s) and a programmable reset timer (150ms internal, 14–28ms with 2.2nF CRT). Both RT and WT pins support internal thresholds (2.4V typical) and bidirectional current sources (±3.1µA) for precise external capacitor-based timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 38V - supports wide-range automotive battery (cold-crank to load-dump) and industrial 12V/24V rails 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 monitoring in low-power diagnostic applications. |
| Output Voltage Options | Fixed 3.3V, fixed 5V, or adjustable 2.5V–5V - selected via logic states on SEL1/SEL2 pins; no external feedback resistors needed for fixed outputs. |
| Charge Pump Modes | Automatic 2:1, 1:1, 1:2 switching - eliminates need for inductors while maintaining regulation across full input range and load variation. |
| Watchdog Timeout | Internally 37.5ms–2.2s windowed range; externally adjustable via CWT - provides fail-safe system recovery for ISO 26262-compliant automotive diagnostics. |
| Reset Timeout | Internally 150–270ms; externally 14–28ms with 2.2nF CRT - supports flexible power-on reset and supply monitoring with pushbutton override capability. |
Pinout & Package
Package: 16-lead plastic MSOP with exposed thermal pad (Pin 17 = GND), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WT (1) | Watchdog Timer Control | Connects to external capacitor for watchdog timeout setting; tied to BIAS for ~1.6s internal timeout; grounding disables watchdog. |
| RT (2) | Reset Timeout Control | Connects to external capacitor for reset timeout; tied to BIAS for ~200ms internal timeout; critical for POR and supply monitoring. |
| RSTI (3) | Reset Input Comparator | High-impedance input compared to 1.2V threshold; drives RST low when below threshold - enables external supply monitoring or pushbutton reset. |
| BIAS (4,8) | Internal Bias Reference | Internal voltage source for internal circuitry; must be bypassed with ≥10µF ceramic capacitor; not for external loading. |
| SEL2 (5) | Output Mode Select | Logic input (with 1µA pull-down) that, with SEL1, selects shutdown, adjustable, 5V, or 3.3V output per Table 1. |
| VIN (6,9) | Main Power Input | Primary input for both charge pump and control circuitry; accepts 2.7V–38V; requires ≥1µF ceramic bypass at each pin. |
| SEL1 (7) | Output Mode Select | Logic input (with 1µA pull-down) paired with SEL2 to configure VOUT regulation mode or shutdown. |
| WDI (10) | Watchdog Input | Falling-edge-triggered watchdog feed; must be toggled within watchdog window (e.g., <2.2s); 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 permitted. |
| VOUT (12) | Regulated Output | Delivers configured output (3.3V/5V/adjustable); capable of 500mA; requires ≥10µF low-ESR ceramic output capacitor. |
| C– (13) | Flying Capacitor Negative | Connects only to negative terminal of CFLY; forms charge-transfer path with C+; no external connection beyond capacitor. |
| RST (14) | Open-Drain Reset Output | Active-low, open-drain signal; pulled up externally (e.g., to VOUT); asserts during reset timeout or VOUT fault. |
| GND (15,17) | Ground / Thermal Pad | Pins 15 and exposed pad (17) are internally connected to GND; pad must be soldered to PCB ground for thermal and electrical performance. |
| OUTS/ADJ (16) | VOUT Sense or Adjust Input | Serves as output voltage sense (fixed modes) or ADJ reference (1.1V) for resistor divider in adjustable mode; directly connected to VOUT for fixed outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI emissions | No inductors required; charge-pump topology inherently reduces magnetic field radiation versus inductor-based DC/DC converters. |
| Windowed watchdog timer | 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. |
| Automatic mode switching | Seamlessly transitions among 2:1, 1:1, and 1:2 charge pump ratios without external intervention or control logic overhead. |
| Integrated overtemperature protection | Shuts down at ~175°C junction temperature and recovers at ~165°C - protects against sustained overload while allowing transient operation above 150°C. |
| Short-circuit and overvoltage protection | Limiting current to 250mA during VOUT short; asserting RST on VOUT overvoltage (>109% nominal) or undervoltage (<93% nominal). |
| Thermally enhanced MSOP package | 16-lead MSOP with exposed GND pad achieves θJA = 40°C/W - enables 500mA operation in compact layouts without heatsinks. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit under cold-crank (5.5V) and load-dump (42V) conditions. IC Role / Device Role / Timing Role: Primary buck-boost regulator and system-level watchdog supervisor; provides clean 5V rail and monitors MCU health via WDI/RSTI. Use Value: Eliminates need for separate LDO + watchdog IC; maintains regulation across 2.7V–38V input swing; supports ISO 26262 diagnostic requirements with windowed watchdog. |
Use Scenario: Generates stable 3.3V supply for PLC I/O modules and fieldbus controllers in 24V industrial backplanes. IC Role / Device Role / Timing Role: Housekeeping DC/DC converter with integrated reset and supply monitoring; replaces discrete reset IC + regulator combo. Use Value: Reduces BOM count and board area; 20µA quiescent current extends backup battery life; overtemperature protection prevents field failures in enclosed enclosures. |
| Low-Power 12V-to-5V Conversion | Diagnostic Monitoring Node |
Use Scenario: Converts 12V vehicle battery to regulated 5V for telematics gateway MCU and cellular modem during sleep mode. IC Role / Device Role / Timing Role: Efficient charge-pump regulator with shutdown mode (1.5µA IQ); uses SEL1/SEL2 to enter low-power state on command. Use Value: Achieves 81% efficiency at 12V→5V/500mA; avoids inductor losses and EMI filtering; supports rapid wake-up via RSTI-driven reset. |
Use Scenario: Embedded in battery management system to monitor cell voltage supervisor IC and trigger system reset on fault detection. IC Role / Device Role / Timing Role: Dual-function device: precision reset generator (via RSTI comparator) and watchdog enforcer (via WDI monitoring). Use Value: Enables autonomous fault recovery without host processor involvement; windowed watchdog prevents false resets from noise or jitter on WDI line. |
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 input range (4.5V–32V); includes dual LDOs and inverting charge pump; no integrated watchdog timer. | Suited for dual-rail bias generation (±VOUT) but lacks system supervision functions. | Select when needing bipolar supplies or LDO post-regulation - not for watchdog-critical automotive use. |
| MAX17504ATP+T | Inductor-based synchronous buck-boost; wider 4.5V–60V input; no integrated timing functions; higher IQ (120µA). | Better for high-current (>1A) or high-efficiency (>90%) needs where EMI tolerance allows inductors. | Choose for higher power density and efficiency where board space permits inductors and layout can manage EMI. |
Compared with LTC3246IMSE#TRPBF, LTC3265EMSE#PBF offers expanded analog functionality but omits watchdog supervision, while MAX17504ATP+T delivers higher efficiency and current capability at the cost of inductor dependency and increased EMI - making LTC3246IMSE#TRPBF uniquely suited for compact, safety-aware, inductor-free 500mA applications.
Availability
LTC3246IMSE#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 support, and AEC-Q200-aligned reliability.
Supply support for LTC3246IMSE#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.
The LTC3246IMSE#TRPBF belongs to ADI's Power by Linear™ family of highly integrated DC/DC solutions designed specifically for space-constrained, reliability-critical applications requiring inductorless operation and built-in functional safety features.
FAQ
What output voltage options does the LTC3246IMSE#TRPBF support?
The LTC3246IMSE#TRPBF 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. Shutdown is enabled when both SEL1 and SEL2 are LOW. The LTC3246IMSE#TRPBF does not require external feedback components for fixed outputs, simplifying design and reducing BOM count.
How is the watchdog timer configured on the LTC3246IMSE#TRPBF?
The LTC3246IMSE#TRPBF watchdog timer is configured via the WT pin: connecting an external capacitor (CWT) to GND sets the timeout window (e.g., 2.2nF yields ~100–220ms), tying WT to BIAS gives ~1.6s internal timeout, and grounding WT+WDI disables it entirely. The windowed architecture requires falling edges on WDI within both lower (e.g., 37.5ms) and upper (e.g., 2.2s) boundaries - a key feature of the LTC3246IMSE#TRPBF for robust fault detection.
What is the maximum continuous output current of the LTC3246IMSE#TRPBF?
The LTC3246IMSE#TRPBF delivers up to 500mA continuous output current under typical conditions (e.g., 12V→5V, 25°C ambient, proper layout and capacitors). Actual current depends on input voltage, output voltage, ambient temperature, and thermal management - at 3V→5V in 1:2 mode, dropout occurs near 150–300mA due to charge pump impedance (4–8Ω). The LTC3246IMSE#TRPBF includes short-circuit foldback limiting to 250mA to protect the device during faults.
Does the LTC3246IMSE#TRPBF require external inductors?
No, the LTC3246IMSE#TRPBF uses switched-capacitor (charge pump) topology and requires only two external capacitors: a flying capacitor (CFLY, typically 2.2µF) and an output capacitor (COUT, ≥10µF ceramic). This eliminates magnetic components, reduces EMI, and saves board space - a defining characteristic of the LTC3246IMSE#TRPBF versus inductor-based regulators.
What package and temperature grade does the LTC3246IMSE#TRPBF have?
The LTC3246IMSE#TRPBF is packaged in a 16-lead plastic MSOP with exposed thermal pad (Pin 17 = GND) and is rated for –40°C to 125°C operating junction temperature (I-grade). The exposed pad must be soldered to the PCB ground plane to achieve specified thermal performance (θJA = 40°C/W) and ensure reliable 500mA operation - a critical implementation detail for the LTC3246IMSE#TRPBF.
LTC3246IMSE#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
LTC3246IMSE#TRPBF FAQ
1.How can I place an order for LTC3246IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3246IMSE#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 LTC3246IMSE#TRPBF reliable?
The price and inventory of LTC3246IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3246IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3246IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3246IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3246IMSE#TRPBF?
LTC3246IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3246IMSE#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 LTC3246IMSE#TRPBF?
For technical support, including LTC3246IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3246IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3246IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3246IMSE#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 LTC3246IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3246IMSE#TRPBF?
All LTC3246IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3246IMSE#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 LTC3246IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3246IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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