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Analog Devices Inc. LTC3256MPMSE#TRPBF
- Part No.:
- LTC3256MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3256MPMSE#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,434
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Product details
Overview
LTC3256MPMSE#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 regulated 5V (100mA max) and 3.3V (250mA max) outputs from 5.5V–38V input, using automatic 2:1/1:1 charge pump mode switching to maximize efficiency-reducing power dissipation by >2W vs dual-LDO solutions at 12VIN/350mA load. It targets automotive ECU and industrial housekeeping supplies requiring high reliability and diagnostic coverage.
For engineers reviewing the LTC3256MPMSE#TRPBF datasheet, LTC3256MPMSE#TRPBF pinout, LTC3256MPMSE#TRPBF application, or LTC3256MPMSE#TRPBF equivalent, key selection considerations include its –55°C to 150°C extended temperature rating, buffered 1.1V reference for system self-test, independent enable control per output, and tolerance of 38V input transients-critical for harsh-environment automotive and industrial power management.
Technical Context
The LTC3256MPMSE#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 sustain regulation across 5.5V–38V. Its 5V output is sourced either from OUTCP via a fault-protected PMOS switch (when VIN > ~10.1V) or directly from VIN via a gated 1:1 regulator (when VIN drops below ~7.2V), while the 3.3V LDO is always powered from OUTCP.
It integrates safety-critical functions including independent power-good comparators (PG3/PG5), a reset controller with adjustable timeout (RT pin), a watchdog timer with configurable upper/lower boundaries (WT/WDI pins), overcurrent protection per output, and overtemperature shutdown at 150°C. The buffered 1.1V reference (REFOUT) supports ISO 26262 diagnostic coverage in ASIL-B/C systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 38V - supports direct connection to automotive battery (cold-crank tolerant) and industrial 24V/36V rails without external pre-regulation. |
| 5V Output Current | 100mA max - sufficient for CAN transceivers, microcontroller I/O, or logic supply with tight regulation (±1.9% over temp/voltage). |
| 3.3V LDO Output Current | 250mA max - powers core logic, sensors, or low-power MCU cores with dropout <150mV at full load. |
| Quiescent Current | 20µA (both outputs regulating, no load) - enables always-on subsystems with minimal battery drain. |
| Operating Junction Temp | –55°C to +150°C - fully tested and guaranteed for extended-temperature automotive and military-grade applications. |
| Charge Pump Modes | Automatic 2:1 and 1:1 switching - maintains efficiency >85% across wide VIN range; avoids thermal derating in compact enclosures. |
| Reference Output | 1.1V ±32mV buffered reference (2kΩ output impedance) - enables system-level voltage margining and safety diagnostics without external components. |
Pinout & Package
The LTC3256MPMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed GND pad (MSE16), requiring soldering of the exposed pad to PCB ground plane for rated thermal performance (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 ceramic flying capacitor (≥0.4µF); critical for charge transfer integrity in 2:1 mode. |
| C+ (2) | Flying capacitor positive terminal | Connects to positive side of flying capacitor; forms charge-transfer path with C– and internal switches A–D. |
| OUTCP (3) | Charge pump regulated output | Provides ~5.05V pre-regulated supply for 3.3V LDO and 5V switch; bypassed with ≥10µF X7R ceramic. |
| OUT5 (4) | 5V regulated output | Delivers up to 100mA; sourced from OUTCP (2:1 mode) or VIN (1:1 mode); includes overvoltage/undervoltage protection. |
| REFOUT (5) | Buffered 1.1V reference | Enables system self-test and voltage margining; requires 0.1µF ceramic bypass for optimal PSRR. |
| OUT3 (6) | 3.3V LDO output | Delivers up to 250mA; powered exclusively from OUTCP; includes PG3 monitoring and overcurrent protection. |
| PG3 (7) | 3.3V power-good open-drain | Signals OUT3 regulation status; must be pulled up externally (e.g., to OUT3) to assert system reset or sequencing logic. |
| PG5 (8) | 5V power-good open-drain | Signals OUT5 regulation status; independent of PG3; supports staggered power-up of mixed-voltage subsystems. |
| RST (9) | Reset open-drain output | Drives low during reset timeout or watchdog fault; pulled up externally to enable MCU/system reset coordination. |
| WT (10) | Watchdog timer control | Configures watchdog upper boundary via external capacitor (CWT) or ties to OUTCP for ~1.6s default timeout. |
| RT (11) | Reset timeout control | Sets reset duration via external capacitor (CRT) or ties to OUTCP for ~200ms default; supports fail-safe boot sequences. |
| RSTI (12) | Reset input comparator | Triggers reset when voltage falls below 1.2V threshold; used for external brown-out detection or system-initiated resets. |
| WDI (13) | Watchdog input | Must be toggled within watchdog window (37.5ms–2s); failure asserts RST; never left floating. |
| VIN (14) | Main input supply | Accepts 5.5V–38V; requires ≥10µF low-ESR ceramic bypass; tolerates 38V transients without damage. |
| EN3 (15) | 3.3V LDO enable | Logic-high enables OUT3 and triggers charge pump startup; 1µA pull-down allows direct MCU GPIO control. |
| EN5 (16) | 5V output enable | Logic-high enables OUT5 and triggers charge pump; supports independent sequencing of 5V and 3.3V rails. |
| GND (Exposed Pad) | Power and signal ground | Thermal and electrical ground; must be soldered to PCB ground plane to meet θJA and reliability specs. |
Key Features
| Feature | Design Value |
|---|---|
| Automated 2:1/1:1 charge pump mode switching | Eliminates manual mode selection and ensures optimal efficiency across 5.5V–38V input range without sacrificing regulation. |
| Independent EN3/EN5 control with soft-start | Enables precise power-rail sequencing for mixed-voltage systems (e.g., MCU core + I/O) and prevents inrush-induced glitches. |
| Integrated watchdog timer with adjustable timing | Supports functional safety requirements (ISO 26262) via configurable fault detection windows and hardware-level reset assertion. |
| Buffered 1.1V reference with 2kΩ output impedance | Enables accurate system-level voltage calibration and diagnostic testing without loading the internal bandgap. |
| Overvoltage/undervoltage protection per output | Prevents downstream component damage by disabling outputs and asserting PG pins upon out-of-spec voltage excursions. |
| 38V transient tolerance and –55°C to 150°C operation | Meets automotive cold-crank and industrial ambient extremes without derating or external protection circuitry. |
Applications
| Automotive ECU Power Supply | Industrial Housekeeping Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in engine control unit under 12V battery with cold-crank dips to 5.5V and load-dump spikes to 38V. IC Role / Device Role / Timing Role: Dual-output DC/DC converter providing isolated, sequenced 5V (CAN) and 3.3V (MCU core) rails with watchdog supervision and power-good signaling. Use Value: Replaces dual-LDO solution, cutting power dissipation by >2W at full load-reducing thermal stress and enabling smaller heatsinks in sealed ECUs. | Use Scenario: Supplies FPGA I/O banks, ADC reference, and communication PHY in telecom base station shelf controller operating from 24V/48V backplane. IC Role / Device Role / Timing Role: Wide-input housekeeping regulator delivering stable 5V and 3.3V with independent enable control and fault reporting for system health monitoring. Use Value: Eliminates need for external pre-regulators; 38V tolerance avoids TVS diodes; REFOUT enables periodic self-calibration of analog subsystems. |
| Low-Power 12V-to-Dual-Rail Conversion | Safety-Critical Diagnostic Subsystem |
Use Scenario: Converts nominal 12V vehicle battery to 5V and 3.3V for infotainment head unit logic, display interface, and touch controller in start-stop vehicles. IC Role / Device Role / Timing Role: Inductorless step-down converter with ultra-low quiescent current (20µA) and shutdown mode (0.5µA) for battery-sensitive always-on functions. Use Value: Enables >1-year battery standby without recharge; automatic mode switching maintains >85% efficiency across wide load and input variations. | Use Scenario: Provides regulated supplies and reference for BMS cell monitor ICs and safety MCU in electric vehicle battery pack, requiring ASIL-B compliance. IC Role / Device Role / Timing Role: Safety-certified power manager with buffered 1.1V reference, independent PG outputs, and watchdog/reset timers for end-to-end diagnostic coverage. Use Value: Meets ISO 26262 diagnostic coverage requirements without external comparators or timers-reducing BOM count 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 (250mA), no 5V rail; includes inverting charge pump for negative supply; lacks watchdog and REFOUT. | Suitable only for single-rail 3.3V systems requiring negative bias; not a drop-in replacement for dual-rail needs. | Select only if 5V output and safety features are unnecessary and negative supply generation is required. |
| TPS6521905RGER | 3.3V/1.8V dual output; 4.5V–18V input; integrated buck + LDO; no charge pump, no watchdog, no extended temp grade. | Targeted at consumer/portable applications; lacks automotive temp range, 38V tolerance, and diagnostic features. | Consider only for cost-sensitive non-automotive designs where input range and safety features are not required. |
Compared with LTC3265EMSE#TRPBF and TPS6521905RGER, the LTC3256MPMSE#TRPBF uniquely combines dual fixed outputs (5V/3.3V), 5.5V–38V input, –55°C to 150°C operation, integrated watchdog, and buffered reference-making it the sole option for automotive and industrial dual-rail safety-critical power management.
Availability
LTC3256MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power supplies, industrial housekeeping systems, and safety-critical diagnostic subsystems requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC3256MPMSE#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 and maintains its legacy of high-performance analog and power management ICs for demanding applications.
The LTC3256 product line was engineered specifically for automotive and industrial systems needing robust, inductorless dual-rail power conversion with built-in functional safety features-including watchdog timers, power-good monitoring, and extended temperature operation.
FAQ
What is the maximum junction temperature specification for the LTC3256MPMSE#TRPBF?
The LTC3256MPMSE#TRPBF is fully tested and guaranteed over an operating junction temperature range of –55°C to +150°C. This extended rating enables use in under-hood automotive applications and high-ambient industrial environments where standard commercial or industrial grade parts would require derating or thermal mitigation. The device includes overtemperature protection that activates above 150°C to prevent permanent damage.
How does the LTC3256MPMSE#TRPBF handle input voltages below 10V?
When VIN drops below ~10.1V, the LTC3256MPMSE#TRPBF automatically transitions from 2:1 to 1:1 charge pump mode to maintain regulation. Below ~7.2V, the 5V output switches from OUTCP sourcing to a VIN-powered 1:1 regulator, while the 3.3V LDO remains supplied by OUTCP. This ensures continuous operation across the full 5.5V–38V range, though efficiency decreases in 1:1 mode compared to 2:1 operation.
Can the LTC3256MPMSE#TRPBF be used without external timing capacitors on RT and WT pins?
Yes-the LTC3256MPMSE#TRPBF operates with default timing values when RT and WT are tied to OUTCP: ~200ms for reset timeout and ~1.6s for watchdog upper boundary. Leaving RT open minimizes reset timeout (~150ms internal). External capacitors are optional for precise adjustment; however, WDI must never be left floating and requires active toggling or grounding to disable the watchdog.
What is the role of the REFOUT pin on the LTC3256MPMSE#TRPBF?
The REFOUT pin on the LTC3256MPMSE#TRPBF provides a buffered 1.1V ±32mV reference with 2kΩ output impedance, derived from the internal bandgap. It enables system-level diagnostics, voltage margining, and self-test routines in safety-critical applications such as ISO 26262-compliant automotive systems-eliminating the need for external precision references and reducing BOM complexity.
Does the LTC3256MPMSE#TRPBF require external flying and input capacitors?
Yes-the LTC3256MPMSE#TRPBF requires a ceramic flying capacitor (≥0.4µF, 6V-rated, X7R/X5R) between C+ and C– pins, and a minimum 10µF low-ESR ceramic capacitor on VIN. These are mandatory for stable charge pump operation, ripple suppression, and meeting specified output current and efficiency. Using polarized or low-voltage capacitors risks malfunction or reduced lifetime.
LTC3256MPMSE#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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC3256MPMSE#TRPBF FAQ
1.How can I place an order for LTC3256MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3256MPMSE#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 LTC3256MPMSE#TRPBF reliable?
The price and inventory of LTC3256MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3256MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3256MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3256MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3256MPMSE#TRPBF?
LTC3256MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3256MPMSE#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 LTC3256MPMSE#TRPBF?
For technical support, including LTC3256MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3256MPMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3256MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3256MPMSE#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 LTC3256MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3256MPMSE#TRPBF?
All LTC3256MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3256MPMSE#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 LTC3256MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3256MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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