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Analog Devices Inc. LTC3256EMSE#TRPBF
- Part No.:
- LTC3256EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3256EMSE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,246
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Product details
Overview
LTC3256EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a wide-input, dual-output switched-capacitor DC/DC converter with integrated watchdog timer and power-good monitoring. It delivers 5V @ 100mA and 3.3V LDO @ 250mA from 5.5V–38V input, uses automatic 2:1/1:1 charge pump mode switching, and features buffered 1.1V reference for safety-critical diagnostics in automotive ECU and industrial housekeeping supplies.
For engineers reviewing the LTC3256EMSE#TRPBF datasheet, LTC3256EMSE#TRPBF pinout, LTC3256EMSE#TRPBF application, or LTC3256EMSE#TRPBF equivalent, key selection criteria include input transient tolerance (38V), independent enable control (EN3/EN5), dual power-good outputs (PG3/PG5), reset/watchdog timing configurability (RT/WT pins), and thermal performance in the 16-lead MSOP package with exposed pad.
Technical Context
The LTC3256EMSE#TRPBF implements a multimode step-down charge pump pre-regulator that automatically selects between 2:1 (VIN/2) and 1:1 (VIN) operation based on input voltage and load conditions to maximize efficiency across 5.5V–38V. Its 5V output is sourced either from the charge pump (VIN > ~10.1V) or a VIN-powered 1:1 regulator (VIN < ~10.1V), while the 3.3V LDO is always powered by OUTCP.
It integrates fault-protected power switches, overcurrent and overtemperature protection, independent open-drain power-good comparators (PG3/PG5), a 1.1V buffered reference (REFOUT), and configurable reset (RSTI/RT/RST) and watchdog (WDI/WT) functions compliant with ISO 26262 diagnostic coverage requirements for ASIL-B systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 38V - supports 12V automotive and 24V industrial rails with 38V transient tolerance. |
| 5V Output Current | 100mA max - fixed 5V output via internal PMOS switch; regulated independently of 3.3V rail. |
| 3.3V LDO Output Current | 250mA max - low-dropout linear post-regulator powered by charge pump output (OUTCP). |
| Quiescent Current | 20µA with both outputs regulating (no load) - enables low-power always-on subsystems. |
| Charge Pump Modes | Automatic 2:1 and 1:1 switching - maintains high efficiency across wide VIN range without external control. |
| Reference Output | 1.1V ±32mV buffered reference (REFOUT) - enables system self-test and safety diagnostics. |
| Operating Junction Temp | –40°C to 125°C - specified for automotive ECU and industrial temperature grades (E-grade). |
Pinout & Package
The LTC3256EMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP plastic package with exposed ground pad (pin 17), requiring soldering to PCB ground plane for thermal and electrical integrity (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C– (1) | Flying capacitor negative terminal | Connects to negative side of external ceramic flying capacitor (≥0.4µF, ≥6V rating). |
| C+ (2) | Flying capacitor positive terminal | Connects to positive side of flying capacitor; forms charge transfer path with C–. |
| OUTCP (3) | Charge pump regulated output | 5.05V nominal output; powers 3.3V LDO and feeds 5V output switch; requires ≥10µF X7R bypass. |
| OUT5 (4) | 5V regulated output | Fixed 5V output enabled by EN5; sourced from OUTCP (2:1 mode) or VIN (1:1 mode); max 100mA. |
| REFOUT (5) | Buffered 1.1V reference | Low-impedance (2kΩ typical) bandgap reference for diagnostics; bypass with 0.1µF ceramic. |
| OUT3 (6) | 3.3V LDO output | Fixed 3.3V output enabled by EN3; powered exclusively by OUTCP; max 250mA. |
| PG3 (7) | 3.3V power-good indicator | Open-drain output pulled high externally; asserts high-Z when OUT3 reaches regulation window. |
| PG5 (8) | 5V power-good indicator | Open-drain output pulled high externally; asserts high-Z when OUT5 reaches regulation window. |
| RST (9) | Reset logic output | Open-drain reset signal; driven low during reset timeout (configurable via RT pin). |
| WT (10) | Watchdog timer control | External capacitor sets watchdog upper boundary; tie to OUTCP for ~1.6s default timeout. |
| RT (11) | Reset timeout control | External capacitor sets reset duration; tie to OUTCP for ~200ms default timeout. |
| RSTI (12) | Reset input comparator | Logic input compared to 1.2V threshold; falling edge triggers reset sequence. |
| WDI (13) | Watchdog input | Edge-triggered watchdog feed pin; must toggle within defined window (37.5ms–2s) to prevent RST assertion. |
| VIN (14) | Main power input | Supplies control circuitry and charge pump; accepts 5.5V–38V with –0.3V to 38V absolute max rating. |
| EN3 (15) | 3.3V LDO enable | Logic-high enables 3.3V LDO and activates charge pump if not already running; 38V-tolerant input. |
| EN5 (16) | 5V output enable | Logic-high enables 5V output and activates charge pump if not already running; 38V-tolerant input. |
| GND (17, Exposed Pad) | System ground | Thermal and electrical ground; must be soldered to PCB ground plane per datasheet layout rules. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and EMI from inductors-ideal for space-constrained automotive and industrial modules. |
| Dual independent enable control | EN3 and EN5 allow sequenced power-up, dynamic rail shutdown, and partial-system sleep modes. |
| Configurable watchdog and reset | RT and WT pins support external capacitor-based timing; internal thresholds enable predictable fault response without microcontroller intervention. |
| ISO 26262 diagnostic coverage | Engineered for ASIL-B diagnostic coverage including REFOUT self-test, power-good comparators, and fault-protected switches. |
| 38V input transient tolerance | Withstands automotive load-dump transients without external TVS, reducing BOM count and board area. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Supply |
|---|---|
Use Scenario: Powering microcontroller core, CAN transceiver, and sensor interface in engine control unit under 12V battery with load-dump transients. IC Role / Device Role / Timing Role: Dual-rail DC/DC converter providing isolated 5V (CAN PHY) and 3.3V (MCU I/O) with independent enable and power-good signaling. Use Value: Reduces power dissipation by >2W vs dual-LDO at full load, enabling smaller heatsinks and higher reliability in sealed enclosures. | Use Scenario: Generating auxiliary 5V and 3.3V rails for PLC I/O modules, fieldbus gateways, and telecom line cards operating from 24V or 48V backplanes. IC Role / Device Role / Timing Role: Wide-input housekeeping supply with watchdog supervision and buffered reference for system-level diagnostics. Use Value: Eliminates need for external watchdog IC and precision reference, simplifying design and improving long-term calibration stability. |
| Low-Power 12V-to-5V/3.3V Conversion | Safety-Critical Diagnostic Subsystem |
Use Scenario: Converting 12V vehicle battery to 5V/3.3V for always-on telematics modules with strict quiescent current limits. IC Role / Device Role / Timing Role: High-efficiency charge-pump converter with 20µA no-load IQ and automatic mode switching across input range. Use Value: Extends battery life in parked-vehicle scenarios while maintaining fast wake-up capability via EN3/EN5 control. | Use Scenario: Providing reference and supervision signals for functional safety monitors in medical or industrial controllers. IC Role / Device Role / Timing Role: Integrated 1.1V buffered reference (REFOUT), dual PG outputs, and configurable RST/WDI for ASIL-B compliance. Use Value: Enables end-to-end diagnostic coverage without external components-reducing failure modes and validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output wide-input DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3265EMSE#TRPBF | Single 3.3V output only; includes inverting charge pump for negative rail; no 5V output or watchdog timer. | Suitable for bipolar supply generation but lacks dual positive rails and safety features of LTC3256EMSE#TRPBF. | Select when needing ±3.3V rails instead of 5V/3.3V; not drop-in compatible due to missing EN5, PG5, WT, and RSTI pins. |
| TPS65218D0RSLR | Integrated PMIC with buck converters (not charge pump); supports 3.3V/1.8V/1.2V; no REFOUT or watchdog; lower VIN max (5.5V). | Targeted at processor power sequencing, not wide-input industrial/automotive housekeeping. | Choose for SoC power management with tight voltage tolerances; unsuitable for 12V/24V input or safety diagnostics. |
Compared with LTC3265EMSE#TRPBF and TPS65218D0RSLR, the LTC3256EMSE#TRPBF uniquely combines wide-input charge-pump efficiency, dual independent positive rails, integrated watchdog/reset, and 1.1V diagnostic reference-making it optimal for automotive ECU and safety-aware industrial supplies where inductorless design and fault resilience are mandatory.
Availability
LTC3256EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial housekeeping systems, and low-power 12V-to-5V/3.3V conversion requiring stable component supply, long lifecycle assurance, and traceable sourcing.
Supply support for LTC3256EMSE#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC3256EMSE#TRPBF belongs to Linear's high-reliability power conversion portfolio, designed specifically for automotive and industrial applications demanding wide-input operation, fault resilience, and functional safety support.
FAQ
What is the maximum input voltage the LTC3256EMSE#TRPBF can withstand?
The LTC3256EMSE#TRPBF has an absolute maximum input voltage rating of 38V and is explicitly rated for automotive load-dump transients. Its input stage tolerates –0.3V to 38V, making it suitable for 12V and 24V systems with harsh voltage spikes. Operation above 38V risks permanent damage per Absolute Maximum Ratings.
How does the LTC3256EMSE#TRPBF manage efficiency across varying input voltages?
The LTC3256EMSE#TRPBF maximizes efficiency by automatically switching between 2:1 (VIN/2) and 1:1 (VIN) charge pump modes depending on VIN and load. At VIN > ~10.1V, it operates in 2:1 mode for highest efficiency; below ~7.2V, it defaults to 1:1 mode. This eliminates manual mode selection and maintains optimal power conversion across its full 5.5V–38V range.
Can the 5V and 3.3V outputs of the LTC3256EMSE#TRPBF be enabled independently?
Yes, the LTC3256EMSE#TRPBF provides independent enable control via EN3 (for 3.3V LDO) and EN5 (for 5V output). Either output can be activated alone, and enabling either pin automatically starts the charge pump. This allows flexible power sequencing, partial-system shutdown, and dynamic rail management without external logic.
What is the purpose of the REFOUT pin on the LTC3256EMSE#TRPBF?
The REFOUT pin on the LTC3256EMSE#TRPBF delivers a buffered 1.1V ±32mV reference derived from the internal bandgap. With 2kΩ typical output impedance and low noise, it enables system-level self-testing, ADC calibration, and functional safety diagnostics-key for ISO 26262 ASIL-B compliance in automotive and industrial applications.
Does the LTC3256EMSE#TRPBF include built-in protection features?
Yes, the LTC3256EMSE#TRPBF integrates overcurrent protection on both outputs, overtemperature shutdown (150°C max junction), and tolerance of 38V input transients. It also features fault-protected internal power switches, open-drain power-good outputs (PG3/PG5), and configurable reset/watchdog logic-providing comprehensive fault resilience for mission-critical systems.
LTC3256EMSE#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
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- -
- Voltage/Current - Output 1:
- 5V, 100mA
- Voltage/Current - Output 2:
- 3.3V, 250mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 5.5V ~ 38V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3256EMSE#TRPBF FAQ
1.How can I place an order for LTC3256EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3256EMSE#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 LTC3256EMSE#TRPBF reliable?
The price and inventory of LTC3256EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3256EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3256EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3256EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3256EMSE#TRPBF?
LTC3256EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3256EMSE#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 LTC3256EMSE#TRPBF?
For technical support, including LTC3256EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3256EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3256EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3256EMSE#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 LTC3256EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3256EMSE#TRPBF?
All LTC3256EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3256EMSE#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 LTC3256EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3256EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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