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Analog Devices Inc. LT3988IMSE#TRPBF
- Part No.:
- LT3988IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3988IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,246
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Product details
Overview
LT3988IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic 60V-input, 1A-per-channel step-down DC/DC converter with integrated NPN power switches, internal boost diodes, and loop compensation. It operates from 4.1V to 60V input, delivers two independent regulated outputs (e.g., 5V/1A and 3.3V/1A), and supports anti-phase switching at up to 2.5MHz to minimize input ripple - used in commercial vehicle battery regulation and industrial distributed supplies.
For engineers reviewing the LT3988IMSE#TRPBF datasheet, LT3988IMSE#TRPBF pinout, LT3988IMSE#TRPBF application, or LT3988IMSE#TRPBF equivalent, key selection factors include its dual 60V-input capability, 180° phase-shifted operation, adjustable 250kHz–2.5MHz switching frequency, thermal shutdown, and 16-lead MSOP package with exposed pad for enhanced thermal performance.
Technical Context
The LT3988IMSE#TRPBF implements current-mode PWM control per channel with cycle-by-cycle current limiting and built-in slope compensation. Its master oscillator sets switching frequency via RT resistor or external SYNC signal, while slave oscillators enable frequency foldback during overload or short-circuit conditions.
Each channel features independent FB pins regulated to 0.750V ±15mV, TRACK/SS pins supporting soft-start or output tracking, and BD pin enabling efficient boost voltage generation from a lower auxiliary supply (≥3V). VIN1 and VIN2 support separate or cascaded inputs, with overvoltage lockout at 60V (80V transient) and undervoltage thresholds of 4.1V (VIN1) and 2.6V (VIN2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.1V to 60V continuous; withstands 80V transients - enables direct connection to 24V/48V commercial vehicle batteries and industrial rails. |
| Output Current per Channel | 1A continuous - supports dual-rail microcontroller or FPGA core/I/O supply without external MOSFETs. |
| Switching Frequency Range | 250kHz to 2.5MHz (adjustable via RT resistor or SYNC pin) - allows optimization between efficiency and component size (e.g., 1MHz enables ≤4.7µH inductors). |
| Feedback Reference Voltage | 0.750V ±15mV over temperature - ensures accurate output regulation across –40°C to 125°C junction range. |
| Phase Relationship | 180° anti-phase switching - reduces RMS input capacitor ripple current by ~30% versus in-phase operation. |
| Shutdown Quiescent Current | <2µA - preserves battery life in always-on vehicle subsystems during sleep mode. |
| Thermal Package | 16-lead MSOP with exposed pad (θJC = 10°C/W) - supports >2W dissipation at 125°C ambient with minimal PCB copper area. |
Pinout & Package
LT3988IMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with an exposed pad (Pin 17) that must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA1, DA2 | Diode anode sense | Monitors external Schottky catch diode current; disables switching if >1.32A - provides short-circuit protection independent of inductor DCR. |
| SW1, SW2 | Power switch output | Drives external inductors; rated for 1.87A peak switch current - supports robust operation under 1A load with margin. |
| BOOST1, BOOST2 | Bootstrap gate drive supply | Provides >VIN voltage to internal NPN switches via external capacitor/diode - enables low VCE(sat) and high efficiency at high VIN. |
| FB1, FB2 | Output voltage feedback | Regulated to 0.750V; connects to resistor divider - sets output voltage as VOUT = 0.75 × (1 + R1/R2) with <0.5% error from bias current. |
| TRACK/SS1, TRACK/SS2 | Soft-start / tracking control | Internal –1.2µA current charges external capacitor for controlled ramp-up; also accepts external voltage for ratiometric sequencing - eliminates supply sequencing ICs. |
| EN/UVLO | Enable / programmable UVLO | Active-high logic input; threshold 1.2V (typ); also accepts resistor divider from VIN1 for custom undervoltage lockout - simplifies system-level brownout protection. |
| RT | Oscillator frequency set | Resistor-to-GND sets frequency from 250kHz to 2.5MHz per formula RT(kΩ) = 1.31/f² + 46.56/f − 7.322 - enables precise EMI tuning. |
| SYNC | External clock synchronization | Accepts 0.25–2.5MHz logic-level signal with ≥100ns pulse width - allows deterministic timing in multi-converter systems to avoid beat frequencies. |
| VIN1, VIN2 | Independent input supplies | VIN1 powers internal circuitry and Channel 1; VIN2 powers Channel 2 only - supports split-rail inputs or cascaded configuration (VIN2 tied to VOUT1). |
| BD | Boost supply reference | Accepts ≥3V auxiliary supply (e.g., VOUT1) to reduce power loss in internal regulators - improves full-load efficiency by ~1.5% vs. VIN-only biasing. |
| GND | Ground reference | Exposes thermal pad (Pin 17) - requires solid solder connection to PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 60V-input, 1A channels | Eliminates need for external high-voltage MOSFETs or pre-regulators in 24V/48V systems - reduces BOM count and layout area. |
| Integrated boost diodes and loop compensation | Removes 4 external diodes and 6 compensation components per channel - accelerates design and improves reliability. |
| Anti-phase switching | Halves input ripple current magnitude and reduces required bulk capacitance by ~50% - lowers cost and footprint of input filter. |
| Frequency foldback under overload | Automatically reduces switching frequency during short-circuit or startup to limit peak switch current - prevents thermal runaway without external circuitry. |
| Programmable UVLO via EN/UVLO pin | Enables system-level brownout detection using single resistor divider from VIN1 - replaces discrete supervisor ICs in vehicle ECUs. |
Applications
| Commercial Vehicle Power Management | Industrial Dual-Rail Supply |
|---|---|
Use Scenario: Regulating 24V/48V battery input to 5V for infotainment MCU and 3.3V for CAN transceivers in heavy-duty trucks. IC Role / Device Role / Timing Role: Dual-output buck controller providing isolated, sequenced, and ripple-reduced power rails with transient tolerance up to 80V. Use Value: Anti-phase operation cuts input capacitor RMS current by 30%, enabling smaller 105°C X7R ceramics instead of larger tantalums - reduces board area by 35%. | Use Scenario: Generating 12V for PLC I/O modules and 5V for ARM-based HMI controllers from unregulated 24V factory floor supply. IC Role / Device Role / Timing Role: Monolithic dual regulator delivering independent, adjustable outputs with programmable soft-start and tracking. Use Value: TRACK/SS pins allow 12V rail to ramp before 5V rail, preventing back-powering of level shifters - eliminates need for external sequencing timers. |
| Distributed Point-of-Load Regulation | Ruggedized Embedded Computing |
Use Scenario: Local conversion of 48V intermediate bus to 1.2V CPU core and 1.8V memory rails in telecom base station cards. IC Role / Device Role / Timing Role: High-frequency (2MHz) dual buck controller enabling compact 2.2µH inductors and ceramic output caps. Use Value: 2.5MHz max frequency allows use of 1.5µH inductors - reduces solution height to <2.5mm and meets strict EMI Class B limits via fixed-frequency operation. | Use Scenario: Powering radiation-tolerant FPGA and ADC in aerospace data acquisition units where input may dip to 5V during engine start. IC Role / Device Role / Timing Role: Wide-input dual regulator with 4.1V UVLO and 60V OVLO protecting downstream logic during battery transients. Use Value: VIN1 undervoltage lockout at 4.1V prevents brownout-induced configuration loss in FPGAs - ensures reliable restart after cranking events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EMSE#TRPBF | Dual output, but uses external N-channel MOSFETs; supports up to 60V input; no integrated power switches or boost diodes. | Requires 4 external MOSFETs, 4 gate drivers, and 2 bootstrap circuits - larger solution size and higher gate-drive losses. | Select when >1A per channel or >95% efficiency at high load is required; not drop-in for LT3988IMSE#TRPBF due to different pinout and external component needs. |
| TPS544B20RTWR | Single 4V–20V input, 4A output with PMBus interface; no second channel or 60V rating; integrates all power stages. | Lacks dual independent outputs and wide-input capability - unsuitable for 24V/48V automotive or industrial inputs. | Choose for digitally controlled single-rail applications needing telemetry; not a functional substitute for LT3988IMSE#TRPBF's dual 60V architecture. |
Compared with LTC3892EMSE#TRPBF and TPS544B20RTWR, LT3988IMSE#TRPBF uniquely combines dual 60V-input capability, integrated switches, and anti-phase operation in a single 16-pin MSOP - offering the smallest footprint and lowest component count for dual-rail 1A designs below 60V.
Availability
LT3988IMSE#TRPBF is available at Aetrix Electronics and suitable for commercial vehicle battery regulation, industrial distributed supplies, and ruggedized embedded computing requiring stable component supply across extended temperature ranges.
Supply support for LT3988IMSE#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 high-reliability analog and power management portfolio. The company specializes in precision signal chain and power solutions for demanding industrial, automotive, and aerospace applications.
LT3988IMSE#TRPBF belongs to Linear's monolithic high-voltage DC/DC converter product line, designed specifically for robust, compact power conversion in environments with wide input ranges, high transients, and space constraints - such as commercial vehicles and factory automation.
FAQ
What is the maximum input voltage rating for LT3988IMSE#TRPBF, and how does it handle transients?
LT3988IMSE#TRPBF has a continuous input voltage rating of 60V on VIN1 and VIN2, with absolute maximum ratings of 80V for nonrepetitive 1-second transients. Its integrated overvoltage lockout circuit disables both channels when VIN1 exceeds 60V (typ), protecting downstream circuitry. During transients, the device remains latched off until VIN1 falls below the hysteresis threshold (~2.1V), ensuring safe recovery. This makes LT3988IMSE#TRPBF suitable for 24V/48V commercial vehicle battery systems where load dump events occur.
Can LT3988IMSE#TRPBF operate with only one input supply, and how are VIN1 and VIN2 configured?
Yes, LT3988IMSE#TRPBF can operate with a single input supply. VIN1 must be connected to the main source (≥4.1V) to power internal circuitry and Channel 1; VIN2 may be tied directly to VIN1 to enable Channel 2, or driven from a separate source (≥2.6V). If VIN2 is driven above 60V, it must be connected to VIN1 per datasheet Note 8. This flexibility allows cascaded operation (e.g., VIN2 = VOUT1) or independent sourcing - critical for fault-isolated industrial systems.
What is the purpose of the BD pin on LT3988IMSE#TRPBF, and what happens if it's left unconnected?
The BD pin on LT3988IMSE#TRPBF provides a low-voltage bias source (≥3V) for internal regulators and boost circuitry, reducing power dissipation compared to drawing all bias current from VIN1. If BD is left unconnected or falls below 3V, quiescent current flows from VIN1 instead, increasing total input current by ~1.1mA and slightly lowering full-load efficiency. For optimal performance, connect BD to a stable ≥3V rail such as VOUT1 - this is explicitly recommended in the Applications Information section of the LT3988IMSE#TRPBF datasheet.
How does LT3988IMSE#TRPBF achieve anti-phase switching, and what is its impact on input filtering?
LT3988IMSE#TRPBF generates 180° out-of-phase clock signals internally using dedicated oscillator circuitry - no external components required. This causes SW1 and SW2 to switch alternately, resulting in cancellation of fundamental input ripple current harmonics. Measured input ripple current RMS is reduced by approximately 30% versus in-phase operation, allowing use of smaller input capacitors (e.g., 10µF X7R instead of 22µF tantalum) while maintaining EMI compliance - a key advantage in space-constrained automotive modules.
Does LT3988IMSE#TRPBF support output voltage tracking, and how is it implemented?
Yes, LT3988IMSE#TRPBF supports output voltage tracking via its TRACK/SS1 and TRACK/SS2 pins. To track one output to another, connect a resistor divider from the master output (e.g., VOUT1) to the TRACK/SS pin of the slave channel (e.g., TRACK/SS2). An internal –1.2µA current source ramps the pin voltage, enabling soft-start; when an external voltage is applied, the FB reference is overridden, forcing the slave output to follow the master. This eliminates need for external tracking ICs and ensures monotonic startup - essential for FPGAs and processors requiring strict supply sequencing.
LT3988IMSE#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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.1V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 59.4V
- Current - Output:
- 1A
- Frequency - Switching:
- 250kHz ~ 2.15MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3988IMSE#TRPBF FAQ
1.How can I place an order for LT3988IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3988IMSE#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 LT3988IMSE#TRPBF reliable?
The price and inventory of LT3988IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3988IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3988IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3988IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3988IMSE#TRPBF?
LT3988IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3988IMSE#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 LT3988IMSE#TRPBF?
For technical support, including LT3988IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3988IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3988IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3988IMSE#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 LT3988IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3988IMSE#TRPBF?
All LT3988IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3988IMSE#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 LT3988IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3988IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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