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Analog Devices Inc. LTC3246HMSE#TRPBF
- Part No.:
- LTC3246HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3246HMSE#TRPBF.pdf
- Description:
- IC REG CHG PUMP ADJ 500MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
LTC3246HMSE#TRPBF from Analog Devices is a thermally enhanced, wide-input (2.7V–38V), buck-boost switched-capacitor DC/DC converter with integrated watchdog timer and pushbutton reset functionality. It delivers up to 500mA regulated output at fixed 3.3V/5V or adjustable 2.5V–5V, uses no inductors, and operates in automatic 2:1/1:1/1:2 fractional charge-pump modes for automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3246HMSE#TRPBF datasheet, LTC3246HMSE#TRPBF pinout, LTC3246HMSE#TRPBF application, or LTC3246HMSE#TRPBF equivalent, key selection criteria include its H-grade 150°C max junction temperature, ultralow 20µA operating IQ, windowed watchdog timing, VOUT overvoltage/undervoltage reset thresholds, and multimode efficiency optimization across 12V-to-5V and 24V-to-3.3V conversion scenarios.
Technical Context
The LTC3246HMSE#TRPBF implements a three-mode fractional charge-pump architecture-2:1 step-down (VIN > 2×VOUT), 1:1 step-down (VOUT < VIN ≤ 2×VOUT), and 1:2 step-up (VIN < VOUT)-with automatic real-time mode switching based on input voltage and load. Internal comparators with hysteresis prevent oscillation at transition boundaries.
Its integrated POR/watchdog controller supports both internal timing (200ms reset timeout, 1.6s watchdog upper bound) and external capacitor-programmable timing via RT and WT pins. The RSTI pin enables external supply monitoring or pushbutton reset, while WDI accepts falling-edge-triggered watchdog pulses with strict lower/upper boundary windows (e.g., 37.5ms–2.2s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 38V (42V absolute max); supports direct connection to automotive battery rails including cold-crank and load-dump transients. |
| Output Current | Up to 500mA continuous; short-circuit foldback limits IOUT_SCKT to 250mA to protect during fault conditions. |
| Quiescent Current | 20µA typical operating IQ, 1.5µA in shutdown; enables always-on operation in low-power automotive modules. |
| Output Voltage Options | Fixed 3.3V (SEL1=HIGH, SEL2=HIGH), fixed 5V (SEL1=LOW, SEL2=HIGH), or adjustable 2.5V–5V (SEL1=HIGH, SEL2=LOW) via OUTS/ADJ feedback. |
| Thermal Rating | H-grade: –40°C to +150°C operating junction temperature; validated for under-hood automotive applications per ISO 26262 diagnostic coverage requirements. |
| Charge Pump Impedance | 1Ω (2:1 mode), 1.2Ω (1:1 mode), 4Ω typical (1:2 mode); determines minimum dropout voltage and load regulation capability. |
| VOUT Ripple | 50mVpp @ 10µF COUT, 25mVpp @ 22µF COUT; enables clean power for CAN transceivers and microcontrollers without LC filtering. |
Pinout & Package
Package: 16-lead plastic MSOP with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 40°C/W) and functional reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| WT (1) | Watchdog Timer Control | Connect external capacitor to GND to set watchdog timeout; tie to BIAS for ~1.6s internal timeout; grounding disables watchdog. |
| RT (2) | Reset Timeout Control | Attach external capacitor to GND to program reset timeout; tie to BIAS for ~200ms internal timeout. |
| RSTI (3) | Reset Input Comparator | Monitors external voltage vs 1.2V threshold; triggers reset if below threshold; supports pushbutton or supply monitoring. |
| BIAS (4,8) | Internal Bias Reference | Internal 3.3V reference for timers and comparators; must be bypassed with ≥10µF ceramic capacitor; not for external loading. |
| SEL2 (5) | Mode Selection Logic | Combined with SEL1, selects output mode: LOW/LOW = shutdown, LOW/HIGH = adjustable, HIGH/LOW = 5V, HIGH/HIGH = 3.3V. |
| VIN (6,9) | Main Power Input | Accepts 2.7V–38V; dual pins reduce trace resistance; requires ≥1µF ceramic bypass close to package. |
| SEL1 (7) | Mode Selection Logic | See SEL2; both pins tolerate 38V and feature 1µA pull-down for direct VIN strapping. |
| WDI (10) | Watchdog Input | Falling-edge triggered; pulse width ≥400ns; must occur within watchdog window (e.g., 100–220ms with 2.2nF CWT) to prevent RST assertion. |
| C+ (11) | Flying Capacitor Positive | Connects only to positive terminal of external flying capacitor (CFLY); no external loading permitted. |
| VOUT (12) | Regulated Output | Delivers up to 500mA; internally monitored for overvoltage (106–109% trip) and undervoltage (93–99% trip) reset generation. |
| 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 / Thermal Pad | Pins 15 and exposed pad (17) are common GND; pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| OUTS/ADJ (16) | Output Sense or Feedback | Serves as VOUT sense for fixed outputs or ADJ node for resistor-divider programming (1.1V reference); connects directly to VOUT or divider network. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless Buck-Boost Conversion | Eliminates magnetic components and EMI filters; reduces BOM count and board area for space-constrained automotive modules. |
| Windowed Watchdog Timer | Rejects spurious resets by enforcing strict lower (37.5ms) and upper (2.2s) timing boundaries; improves system reliability in noisy environments. |
| H-Temperature Grade Validation | Guaranteed operation from –40°C to +150°C junction; qualified for under-hood ECUs and industrial control units requiring extended thermal margin. |
| Ultralow EMI Emissions | No inductor ripple current or high-di/dt switching nodes; meets stringent automotive EMC requirements without shielding or ferrites. |
| Integrated Overvoltage/Undervoltage Reset | Generates precise RST assertion at 106–109% (OV) and 93–99% (UV) of final regulation voltage; eliminates need for external supervisor ICs. |
| Automatic Multimode Efficiency Optimization | Selects optimal 2:1/1:1/1:2 charge-pump ratio in real time; maintains >81% efficiency from 12V-to-5V and >75% from 24V-to-3.3V across full load range. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit exposed to 12V battery with cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary 5V housekeeping regulator with integrated watchdog and reset supervision; replaces discrete LDO + external reset IC + timer circuit. Use Value: Single-chip solution reduces component count by ≥4 parts, withstands 42V abs max input, and provides fail-safe reset during brownout or software hang. |
Use Scenario: Generates stable 3.3V rail for PLC I/O modules and fieldbus gateways operating from 24V industrial bus with wide ambient temperature swings. IC Role / Device Role / Timing Role: Wide-input buck-boost regulator with programmable reset timeout and thermal protection; serves as main logic supply with built-in diagnostics. Use Value: Eliminates need for pre-regulator stage; H-grade rating ensures reliability at 150°C junction; 20µA IQ extends battery backup runtime in uninterruptible systems. |
| Low-Power 12V-to-5V Conversion | Adjustable Microcontroller Core Supply |
Use Scenario: Converts nominal 12V vehicle power to regulated 5V for infotainment MCU, display driver, and USB peripheral circuits. IC Role / Device Role / Timing Role: High-efficiency charge-pump DC/DC with automatic mode switching; delivers 500mA with <50mV ripple using only ceramic capacitors. Use Value: Achieves 81% efficiency at 12V→5V/500mA without inductors; simplifies layout and avoids EMI compliance issues associated with inductive switching. |
Use Scenario: Supplies adjustable 2.8V–4.2V core voltage to FPGA or ARM processor in portable test equipment powered from 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Adjustable-output buck-boost regulator with shutdown control and precision 1.1V feedback reference; enables dynamic voltage scaling. Use Value: Supports 2.5V–5V output via external resistor divider; 1.5µA shutdown IQ preserves battery life; integrated reset prevents boot failure during low-VIN transitions. |
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#TRPBF | Lower input range (4.5V–32V), dual output (±VOUT), no integrated watchdog; 30µA IQ, 200mA per rail. | Designed for precision analog biasing (e.g., op-amp dual supplies), not single-rail microcontroller power. | Select when bipolar output or ultra-low noise is required; avoid for automotive watchdog-critical systems. |
| MAX17521ATP+T | Inductor-based synchronous buck-boost; 4.5V–60V input, 500mA, 12µA IQ; no integrated watchdog or reset logic. | Higher efficiency at high loads (>300mA), but requires inductor and generates higher EMI; lacks safety features. | Choose for high-current, low-noise industrial power where external watchdog IC can be added; not drop-in for LTC3246HMSE#TRPBF footprint. |
Compared with LTC3246HMSE#TRPBF, LTC3265EMSE#TRPBF trades watchdog functionality for dual-rail precision, while MAX17521ATP+T offers higher peak efficiency at the cost of inductor dependency and missing safety integration-making LTC3246HMSE#TRPBF uniquely suited for compact, safety-aware automotive and industrial housekeeping.
Availability
LTC3246HMSE#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 H-temperature grade assurance.
Supply support for LTC3246HMSE#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 LTC3246 belongs to ADI's Power by Linear™ family of highly integrated DC/DC converters engineered for automotive and industrial applications demanding wide input range, high reliability, and functional safety features like watchdog timers and overtemperature protection.
FAQ
What is the maximum junction temperature specification for the LTC3246HMSE#TRPBF?
The LTC3246HMSE#TRPBF is an H-grade device with a guaranteed operating junction temperature range of –40°C to +150°C. Its absolute maximum junction temperature is 150°C, and it includes overtemperature protection that shuts down the device if junction temperature exceeds ~175°C. This rating makes LTC3246HMSE#TRPBF suitable for under-hood automotive applications where ambient temperatures exceed 105°C.
How does the LTC3246HMSE#TRPBF implement its windowed watchdog function?
The LTC3246HMSE#TRPBF implements a windowed watchdog by enforcing two timing boundaries: a lower boundary (e.g., 37.5ms minimum) and an upper boundary (e.g., 2.2s maximum) for WDI falling-edge pulses. If no valid edge occurs within this window-or if edges occur too frequently or too infrequently-the RST pin is asserted low. This prevents false resets from noise or stuck firmware, a critical requirement for ISO 26262-compliant systems.
Can the LTC3246HMSE#TRPBF operate without external timing capacitors?
Yes, the LTC3246HMSE#TRPBF can operate without external timing capacitors. Tying RT to BIAS sets an internal reset timeout of ~200ms; tying WT to BIAS sets a watchdog upper boundary of ~1.6s. Both pins default to internal timing when left unconnected or tied appropriately, enabling rapid prototyping and reducing BOM count for basic implementations of LTC3246HMSE#TRPBF.
What output voltage options does the LTC3246HMSE#TRPBF support, and how are they selected?
The LTC3246HMSE#TRPBF supports three output configurations: fixed 5V (SEL2=HIGH, SEL1=LOW), fixed 3.3V (SEL2=HIGH, SEL1=HIGH), and adjustable 2.5V–5V (SEL2=LOW, SEL1=HIGH) via external resistor divider on OUTS/ADJ. Driving both SEL1 and SEL2 LOW places LTC3246HMSE#TRPBF in shutdown, pulling VOUT low through an ~80kΩ internal impedance.
Does the LTC3246HMSE#TRPBF require inductors, and what are the key external components needed?
No, the LTC3246HMSE#TRPBF is an inductorless switched-capacitor DC/DC converter. Required external components are minimal: one flying capacitor (CFLY = 2.2µF ceramic), one output capacitor (COUT ≥ 10µF low-ESR ceramic), one 10µF BIAS bypass capacitor, and optional timing capacitors on RT and WT. No inductors, diodes, or compensation networks are needed-reducing size, cost, and EMI concerns for LTC3246HMSE#TRPBF designs.
LTC3246HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3246HMSE#TRPBF FAQ
1.How can I place an order for LTC3246HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3246HMSE#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 LTC3246HMSE#TRPBF reliable?
The price and inventory of LTC3246HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3246HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3246HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3246HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3246HMSE#TRPBF?
LTC3246HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3246HMSE#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 LTC3246HMSE#TRPBF?
For technical support, including LTC3246HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3246HMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3246HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3246HMSE#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 LTC3246HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3246HMSE#TRPBF?
All LTC3246HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3246HMSE#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 LTC3246HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3246HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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