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Analog Devices Inc. LT3988EMSE#TRPBF
- Part No.:
- LT3988EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3988EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,919
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Product details
Overview
LT3988EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic 60V-input, 1A-output step-down DC/DC converter with integrated NPN power switches, internal boost diodes, and loop compensation. It supports independent or cascaded 4.1V–60V inputs (80V transient tolerant), delivers two regulated outputs up to 1A each, and operates at 250kHz–2.5MHz with anti-phase switching to reduce input ripple. It is used in commercial vehicle battery regulation and industrial distributed supplies.
For engineers reviewing the LT3988EMSE#TRPBF datasheet, LT3988EMSE#TRPBF pinout, LT3988EMSE#TRPBF application, or LT3988EMSE#TRPBF equivalent, key selection considerations include its dual-channel current-mode control, programmable switching frequency via RT resistor or SYNC input, thermal shutdown, undervoltage/overvoltage lockout on VIN1/VIN2, and MSOP-16 package with exposed GND pad for thermal management.
Technical Context
The LT3988EMSE#TRPBF implements a constant-frequency current-mode PWM architecture with cycle-by-cycle current limiting and slope compensation. Each channel features independent feedback (FB1/FB2) regulating to 0.750V, soft-start/tracking via TRACK/SS pins, and internal NPN switches driven by BOOST1/BOOST2 with BD-supplied bias.
It integrates dual oscillators: a master oscillator sets nominal frequency (250kHz–2.5MHz), while a slave oscillator enables frequency foldback during overload or short-circuit conditions when VFB drops below 50% of regulation. Anti-phase operation (180° phase shift between SW1 and SW2) reduces input capacitor RMS current and EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN1: 4.1V–60V (80V transient); VIN2: 2.6V–60V - supports wide automotive and industrial supply rails with overvoltage protection. |
| Output Current | 1A per channel - sufficient for powering FPGAs, microcontrollers, and analog subsystems from single compact layout. |
| Switching Frequency | 250kHz–2.5MHz (RT-programmable or SYNC-synchronized) - enables use of small 1.5–22µH inductors and ceramic output capacitors. |
| Feedback Reference | 0.750V ±15mV (–40°C to 125°C) - precise setpoint enabling accurate output regulation across temperature with minimal resistor-divider error. |
| Quiescent Current | VIN1 IQ = 1.6–4.5mA; VIN2 IQ = 250–1000µA; Shutdown IQ < 1µA - low bias consumption extends battery life in always-on systems. |
| Protection Features | Thermal shutdown, DA-pin overcurrent disable, VIN1/VIN2 UVLO/OVLO, frequency foldback - robust fault handling without external circuitry. |
| Package | 16-lead MSOP with exposed GND pad (θJC = 10°C/W) - thermally enhanced for high-power-density 2W+ dual-regulator designs. |
Pinout & Package
LT3988EMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package with an exposed GND pad (Pin 17) that must be soldered to PCB for electrical continuity and thermal dissipation (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 - protects against short-circuit and overload. |
| SW1, SW2 | Power switch output | Drives external inductor and catch diode; NPN collector node with 850mV saturation voltage at 1A - defines conduction loss and thermal load. |
| BOOST1, BOOST2 | Bootstrap drive voltage | Provides gate drive >VIN for internal NPN switches; sourced from BD pin via internal Schottky - enables efficient high-side switching. |
| BD | Boost bias supply | Accepts ≥3V supply (e.g., VOUT) to reduce VIN1 quiescent current and improve efficiency - critical for low-IQ operation. |
| EN/UVLO | Enable & input undervoltage monitor | Logic-enable input with 1.2V threshold; also functions as programmable UVLO when resistor-divided from VIN1 - simplifies power sequencing. |
| FB1, FB2 | Output voltage feedback | Sense nodes regulated to 0.750V; bias current ≤100nA - allows high-impedance resistor dividers minimizing standby power loss. |
| RT | Oscillator frequency set | Resistor-to-GND sets switching frequency from 250kHz–2.5MHz - determines size trade-off between inductors and AC losses. |
| SYNC | External clock input | Accepts 0.25–2.5MHz logic-level signal; overrides RT setting - enables EMI reduction via spread-spectrum or system clock synchronization. |
| TRACK/SS1, TRACK/SS2 | Soft-start & output tracking | Internal –1.2µA current charges external capacitor for controlled ramp-up; or connects to another rail for ratiometric startup - prevents inrush and sequencing issues. |
| VIN1, VIN2 | Input power supplies | VIN1 powers internal circuitry + Channel 1; VIN2 powers Channel 2 only - supports independent or cascaded inputs (VIN2 must tie to VIN1 if >60V). |
| GND | Ground reference & thermal path | Exposed pad (Pin 17) is electrically and thermally connected to GND - mandatory soldering required for safe operation and thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual anti-phase switching | 180° phase shift between SW1/SW2 reduces input ripple current by ~30%, allowing smaller input bulk capacitors and lower EMI filter cost. |
| Integrated boost diodes & BD bias | Eliminates 2 external Schottky diodes; BD pin enables bias sourcing from VOUT instead of VIN1 - cuts VIN1 quiescent current by >50% in typical 5V/3.3V dual-rail designs. |
| Programmable frequency with foldback | RT resistor or SYNC input sets 250kHz–2.5MHz; under overload, slave oscillator reduces frequency to limit peak switch current - improves fault robustness without external ICs. |
| Wide-input UVLO/OVLO with hysteresis | VIN1 UVLO = 4.1V (260mV hysteresis); OVLO = 64V (2.1V hysteresis); VIN2 UVLO = 2.6V (135mV hysteresis) - ensures reliable start-up and transient survival in 12V/24V/48V vehicle and industrial systems. |
| Current-mode control with slope compensation | Enables stable operation at duty cycles >50%; provides inherent cycle-by-cycle current limiting and fast transient response - no external compensation needed for standard layouts. |
Applications
| Commercial Vehicle Battery Regulation | Industrial Distributed Supply Regulation |
|---|---|
|
Use Scenario: Regulating 12V/24V/48V battery systems in trucks, buses, and off-highway equipment where input transients reach 80V and ambient temperatures exceed 105°C. IC Role / Device Role / Timing Role: Dual-channel buck controller providing isolated 5V and 3.3V rails for engine control units (ECUs), CAN transceivers, and sensor interfaces. Use Value: 80V transient tolerance, –40°C to 125°C junction rating, and anti-phase switching ensure reliable operation without derating or external TVS clamping. |
Use Scenario: Powering multiple subsystems (PLC I/O, fieldbus interfaces, analog front-ends) from a centralized 24V or 48V industrial bus with strict ripple and EMI requirements. IC Role / Device Role / Timing Role: Compact dual-output regulator replacing two discrete buck ICs, reducing board area and BOM count while maintaining independent output control. Use Value: Integrated loop compensation, RT-programmable frequency, and SYNC capability enable optimized EMI performance and simplified layout versus discrete solutions. |
| Automotive Infotainment Power | Test & Measurement Equipment Supplies |
|
Use Scenario: Generating clean 5V and 3.3V rails for infotainment head units operating in vehicles with cold-crank (4.1V) and load-dump (80V) events. IC Role / Device Role / Timing Role: Primary DC/DC converter with EN/UVLO sequencing and TRACK/SS-controlled soft-start to prevent brownout during ignition transitions. Use Value: Low shutdown IQ (<1µA), precise 0.750V reference, and BD-bias efficiency allow direct battery connection without pre-regulator - extending runtime in standby mode. |
Use Scenario: Providing stable, low-noise dual outputs for precision ADCs, DACs, and op-amps in benchtop instruments where output ripple directly impacts measurement accuracy. IC Role / Device Role / Timing Role: High-frequency (1–2MHz) dual buck regulator using ceramic capacitors to achieve <10mVpp ripple at full load. Use Value: Constant-frequency current-mode control and low-impedance ceramic-capacitor support yield predictable, low-noise outputs without LC filter tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EFE#PBF | 40V max input, 2-phase interleaved (not anti-phase), requires external MOSFETs, higher IQ (15µA shutdown) | Better suited for high-current (>10A) applications requiring phase interleaving; less suitable for space-constrained 1A dual-rail designs | Select LTC3892EFE#PBF only when higher output current, external FET flexibility, or 40V input ceiling is acceptable - not drop-in for LT3988EMSE#TRPBF's 60V/1A/MSOP footprint. |
| MPQ4420AGU-AEC1-P | 40V max input, 2A per channel, QFN-16, AEC-Q200 qualified, no BD pin or frequency foldback | Targeted at automotive ADAS modules needing AEC-Q200; lacks VIN2 independence and transient robustness beyond 40V | Choose MPQ4420AGU-AEC1-P for AEC-Q200-compliant 40V systems requiring 2A/channel; avoid where 60V operation, 80V transient immunity, or BD-bias efficiency are required. |
Compared with LTC3892EFE#PBF and MPQ4420AGU-AEC1-P, the LT3988EMSE#TRPBF uniquely combines 60V input rating, integrated NPN switches in MSOP-16, BD-bias efficiency, and frequency foldback - making it optimal for compact, high-transient industrial and commercial vehicle dual-rail supplies where external FETs or AEC-Q200 are unnecessary.
Availability
LT3988EMSE#TRPBF is available at Aetrix Electronics and suitable for commercial vehicle battery regulation, industrial distributed supply regulation, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to 125°C operation.
Supply support for LT3988EMSE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3988 product line was designed by Linear Technology specifically for rugged dual-output DC/DC conversion in automotive, industrial, and transportation systems demanding wide input range, high transient immunity, and compact thermal packaging.
FAQ
What is the maximum input voltage rating for LT3988EMSE#TRPBF, and how does it handle transients?
The LT3988EMSE#TRPBF has a continuous input voltage rating of 60V on VIN1 and VIN2, with absolute maximum transient tolerance of 80V for nonrepetitive 1-second events. Its VIN1 overvoltage lockout activates at 64V (typical), shutting down both channels to protect downstream circuitry. This makes LT3988EMSE#TRPBF suitable for 24V and 48V commercial vehicle systems experiencing load-dump transients, without requiring external TVS diodes in most cases.
Can LT3988EMSE#TRPBF operate with independent input sources on VIN1 and VIN2?
Yes, LT3988EMSE#TRPBF supports fully independent input supplies on VIN1 and VIN2 - VIN1 powers internal bias circuitry and Channel 1, while VIN2 powers only Channel 2. However, VIN2 must be ≤60V; if VIN2 exceeds 60V, it must be tied directly to VIN1. The device also supports cascaded operation where VIN2 is driven from VOUT1, enabling efficient multi-stage conversion. This flexibility is confirmed in the Absolute Maximum Ratings and Pin Functions sections of the LT3988 datasheet.
What is the purpose of the BD pin on LT3988EMSE#TRPBF, and how should it be connected?
The BD pin on LT3988EMSE#TRPBF serves two critical functions: it sets the BOOST1/BOOST2 drive voltage level and provides a low-voltage bias path for internal circuitry. It must be connected to a stable ≥3V supply - typically VOUT1 or VOUT2 - to minimize VIN1 quiescent current and maximize efficiency. If BD falls below 3V, LT3988EMSE#TRPBF draws increased current from VIN1, degrading light-load efficiency. This behavior is documented in the Electrical Characteristics table and Applications Information section.
Does LT3988EMSE#TRPBF support synchronization to an external clock, and what are the timing requirements?
Yes, LT3988EMSE#TRPBF supports external clock synchronization via the SYNC pin, accepting logic-level signals from 0.25MHz to 2.5MHz. The input requires minimum high/low pulse widths of 100ns each and VIH ≥1.5V. An RT resistor must still be installed to set a nominal frequency within ±25% of the sync frequency - this ensures proper slope compensation calibration. These requirements are specified in the Electrical Characteristics and Applications Information sections of the LT3988 datasheet.
How does LT3988EMSE#TRPBF implement overcurrent protection, and is it latch-off or auto-recover?
LT3988EMSE#TRPBF uses dual overcurrent protection: (1) cycle-by-cycle current limiting via internal comparator sensing switch current, and (2) DA-pin overcurrent disable, which shuts down the affected channel if external catch diode current exceeds 1.32A. Both protections are auto-recovering - normal operation resumes once the fault condition clears. Additionally, frequency foldback activates during sustained overload (e.g., short-circuit), reducing switching frequency to limit peak switch current. These mechanisms are detailed in the Block Diagram, Pin Functions, and Applications Information sections.
LT3988EMSE#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
LT3988EMSE#TRPBF FAQ
1.How can I place an order for LT3988EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3988EMSE#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 LT3988EMSE#TRPBF reliable?
The price and inventory of LT3988EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3988EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3988EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3988EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3988EMSE#TRPBF?
LT3988EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3988EMSE#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 LT3988EMSE#TRPBF?
For technical support, including LT3988EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3988EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3988EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3988EMSE#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 LT3988EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3988EMSE#TRPBF?
All LT3988EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3988EMSE#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 LT3988EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3988EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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