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Analog Devices Inc. LT3988EMSE#PBF
- Part No.:
- LT3988EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3988EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
LT3988EMSE#PBF from Analog Devices (formerly Linear Technology) is a dual monolithic 60V-input, 1A-per-channel synchronous step-down DC/DC converter with integrated power switches, 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 for reduced input ripple - used in commercial vehicle battery regulation and industrial distributed supplies.
For engineers reviewing the LT3988EMSE#PBF datasheet, LT3988EMSE#PBF pinout, LT3988EMSE#PBF application, or LT3988EMSE#PBF equivalent, key selection factors include its dual-channel 60V input capability, 1A per channel output current, 16-lead MSOP package with exposed thermal pad, adjustable 250kHz–2.5MHz switching frequency, and built-in overvoltage lockout (60V) with 80V transient tolerance.
Technical Context
The LT3988EMSE#PBF implements a current-mode PWM architecture with cycle-by-cycle current limiting and internal slope compensation. Each channel features independent feedback (FB1/FB2) regulating to 0.75V, programmable soft-start/tracking via TRACK/SS pins, and synchronized anti-phase operation reducing input RMS ripple by ~30% versus in-phase switching.
It integrates bipolar NPN power switches with on-chip boost diodes (BD pin referenced), internal bias regulator, thermal shutdown, and dual oscillators - one master (RT/SYNC controlled) and one slave for frequency foldback during overload or short-circuit conditions. VIN1 undervoltage lockout triggers at 4.1V (typ), while VIN1 overvoltage lockout activates at 60V (typ) with 2.1V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.1V to 60V continuous; withstands 80V non-repetitive transients - enables direct connection to 24V/48V vehicle or industrial bus without pre-regulation. |
| Output Current per Channel | 1A continuous - supports dual-rail microcontroller, FPGA, or sensor subsystems without external current boosting. |
| Switching Frequency Range | 250kHz to 2.5MHz (set by RT resistor or SYNC signal) - allows optimization of size (high-freq) vs. efficiency (low-freq). |
| Feedback Reference Voltage | 0.75V ±1.5% over temperature - enables precise output voltage setting with standard resistor dividers (e.g., 5V = 10kΩ/1.5kΩ). |
| Quiescent Current (VIN1) | 2.7mA (typ) at no load - minimizes standby power loss in always-on automotive or industrial modules. |
| Shutdown Current | <1µA (max) - ensures ultra-low leakage when EN/UVLO is pulled low, critical for battery-backed systems. |
| Thermal Package | 16-lead MSOP with exposed GND pad (θJC = 10°C/W) - enables >1.5W dissipation at 125°C junction without heatsink in typical PCB layouts. |
Pinout & Package
The LT3988EMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with an exposed GND pad (Pin 17) that must be soldered to the PCB for electrical integrity and thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA1, DA2 | Diode anode sense inputs | Detect external Schottky catch diode current; disable switching if >1.32A - provides short-circuit protection independent of current-sense resistor. |
| SW1, SW2 | Power switch outputs | Drive external inductors and catch diodes; each handles peak currents up to 2.25A - requires low-ESR ceramic input caps and proper layout for EMI control. |
| BOOST1, BOOST2 | Internal switch gate drive supplies | Generated via external boost capacitors; voltage ≥2.5V required - enables low VCE(sat) operation of internal NPN switches for high efficiency. |
| FB1, FB2 | Output voltage feedback inputs | Regulated to 0.75V; bias current ≤100nA - permits use of high-value resistors to minimize divider power loss. |
| TRACK/SS1, TRACK/SS2 | Soft-start and output tracking control | Internal –1.2µA current charges external capacitor for controlled ramp-up; also accepts external voltage for ratiometric sequencing - essential for multi-rail SoC power-up. |
| EN/UVLO | Enable and undervoltage lockout input | Active-high enable threshold = 1.2V (typ); UVLO hysteresis = 120mV - supports programmable turn-on via resistor divider from VIN1. |
| RT | Oscillator frequency set input | Resistor-to-GND sets frequency from 250kHz to 2.5MHz per formula RT(kΩ) = 1.31/f² + 46.56/f − 7.322 - enables precise timing without external clock source. |
| VIN1, VIN2 | Independent input supply pins | VIN1 powers internal circuitry and Channel 1; VIN2 powers Channel 2 only - allows cascaded or isolated input configurations (e.g., VIN2 = VOUT1). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diodes | Eliminates need for two external Schottky diodes - reduces BOM count, board area, and forward voltage drop losses in boost path. |
| Anti-phase switching | 180° phase shift between SW1 and SW2 - cuts input capacitor RMS current by ~70%, enabling smaller bulk capacitance and lower EMI. |
| Frequency foldback | Slave oscillator reduces fSW under overload/short-circuit - limits peak switch current to ≤1.1A and prevents thermal runaway without external circuitry. |
| Programmable UVLO/OVLO | VIN1 UVLO = 4.1V (typ), OVLO = 60V (typ); EN/UVLO pin allows custom thresholds - supports robust start-up and fault isolation in variable-battery environments. |
| Thermally optimized MSOP | Exposed GND pad with θJC = 10°C/W - achieves 125°C junction operation at full 1A load with minimal copper area (≥2 cm² 2oz Cu). |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and analog sensors from 12V/24V vehicle battery with cold-crank (4.5V) and load-dump (80V) transients. IC Role / Device Role / Timing Role: Dual-output buck regulator providing isolated 5V (MCU core) and 3.3V (peripherals) rails with coordinated soft-start and tracking. Use Value: Single-chip solution eliminates discrete regulators and sequencing ICs; 80V transient tolerance avoids need for TVS clamping on input. | Use Scenario: Generating 5V and 12V auxiliary rails for digital I/O expansion cards in modular PLC backplanes with wide input range (18–60V DC). IC Role / Device Role / Timing Role: Primary DC/DC controller delivering stable, low-noise power to field-side logic and analog conditioning circuits. Use Value: Anti-phase operation reduces input ripple current, allowing smaller 105°C aluminum electrolytics instead of costly polymer caps. |
| Ruggedized Medical Instrument Supply | Telecom Remote Radio Unit |
Use Scenario: Providing isolated 3.3V and 5V rails for ADCs, DACs, and isolated communication interfaces in portable diagnostic devices operating from 24V medical-grade SMPS. IC Role / Device Role / Timing Role: High-efficiency dual buck converter with low shutdown IQ (<1µA) supporting battery backup mode. Use Value: Integrated loop compensation and 0.75V reference simplify design validation; 125°C rated version (LT3988E) meets extended temperature requirements. | Use Scenario: Powering FPGAs and RF front-end ICs in outdoor small-cell base stations powered from -48V telecom rectifiers via intermediate 12V bus. IC Role / Device Role / Timing Role: Dual 1A regulator generating clean 1.2V (core) and 3.3V (I/O) from 12V intermediate rail using external LDO post-regulation. Use Value: 2.5MHz max switching frequency enables <2.2µH inductors and 10µF ceramic output caps - reduces footprint by >40% vs. 500kHz solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5165QDPRRQ1 | Single-channel, 65V input, 150mA output; requires external MOSFETs and compensation - not dual-output or integrated-switch capable. | Targeted at low-power automotive infotainment displays, not dual-rail industrial loads. | Select only if system needs single-output, AEC-Q100 qualified part with lower quiescent current (15µA). |
| TPS54260DGQR | Single-channel, 60V input, 2.5A output; no integrated boost diodes or anti-phase capability - requires external bootstrap components and separate sync for multi-channel use. | Used in higher-current single-rail applications like motor drivers, not dual-output sequencing. | Choose when needing >1A per rail or cost-sensitive designs where external diodes are acceptable. |
Compared with LM5165QDPRRQ1 and TPS54260DGQR, the LT3988EMSE#PBF uniquely delivers dual 1A outputs with integrated switches, boost diodes, and anti-phase operation in a single MSOP package - eliminating four external diodes, two bootstrap networks, and inter-channel synchronization circuitry required by alternatives.
Availability
LT3988EMSE#PBF is available at Aetrix Electronics and suitable for commercial vehicle battery regulation, industrial PLC I/O power, and ruggedized medical instrument supply requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3988EMSE#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3988 product line was designed specifically for high-voltage dual-output DC/DC conversion in harsh environments - emphasizing transient robustness, thermal efficiency, and integration to reduce bill-of-materials in automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum input voltage rating for LT3988EMSE#PBF?
The LT3988EMSE#PBF has an absolute maximum input voltage rating of 80V for non-repetitive 1-second transients, with continuous operation rated up to 60V on VIN1. VIN2 is rated for 60V continuous but must be tied to VIN1 if driven above that level. The device incorporates overvoltage lockout that disables regulation when VIN1 exceeds 60V (typ), ensuring protection against sustained overvoltage events. This makes LT3988EMSE#PBF suitable for 24V and 48V industrial and automotive systems subject to load dump.
Does LT3988EMSE#PBF require external catch diodes?
No, the LT3988EMSE#PBF does not require external catch diodes because it integrates internal Schottky boost diodes connected between the BD pin and BOOST1/BOOST2 pins. However, external Schottky diodes must still be connected from SW1/SW2 to GND (anode to DA1/DA2) to provide the freewheeling path during switch-off. The DA pins monitor diode current for overload protection, so correct diode placement and selection (e.g., 3A, 40V Schottky) are mandatory for reliable operation of LT3988EMSE#PBF.
How is switching frequency set on LT3988EMSE#PBF?
Switching frequency on LT3988EMSE#PBF is set either by connecting a resistor from the RT pin to GND (range: 250kHz to 2.5MHz), or by applying a logic-level clock signal to the SYNC pin. The RT resistor value follows the formula RT(kΩ) = 1.31/f² + 46.56/f − 7.322, where f is in MHz. When using SYNC, the RT resistor must still be installed to set a nominal frequency within ±25% of the desired sync frequency. The LT3988EMSE#PBF automatically detects SYNC presence and switches modes without external configuration.
What thermal considerations apply to LT3988EMSE#PBF in a 16-lead MSOP package?
The LT3988EMSE#PBF uses a 16-lead MSOP package with an exposed GND pad (Pin 17) that must be soldered to a minimum 2 cm² copper area on the PCB for effective heat dissipation. With θJC = 10°C/W and θJA = 40°C/W, the package can sustain 1A per channel at 125°C junction temperature when mounted on 2oz copper with thermal vias. Derating is required above 100°C ambient; full 2A combined output is achievable below 85°C ambient with adequate copper pour. Thermal shutdown activates at 150°C (LT3988H grade) or 125°C (LT3988E grade) to protect LT3988EMSE#PBF.
Can LT3988EMSE#PBF generate two different output voltages simultaneously?
Yes, the LT3988EMSE#PBF independently regulates two output voltages via separate FB1 and FB2 pins, each referenced to 0.75V. By selecting appropriate resistor dividers (e.g., R1/R2 = (VOUT/0.75) − 1), users can configure outputs such as 5V/1A on Channel 1 and 3.3V/1A on Channel 2. The TRACK/SS1 and TRACK/SS2 pins further enable coordinated start-up - e.g., having Channel 2 track Channel 1's ramp for proper power sequencing in multi-rail systems - making LT3988EMSE#PBF ideal for powering complex SoCs or FPGAs with strict voltage sequencing requirements.
LT3988EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3988EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3988EMSE#PBF 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#PBF reliable?
The price and inventory of LT3988EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3988EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3988EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3988EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3988EMSE#PBF?
LT3988EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3988EMSE#PBF 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#PBF?
For technical support, including LT3988EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3988EMSE#PBF requirements.
6.How does Aetrix verify that LT3988EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3988EMSE#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3988EMSE#PBF?
All LT3988EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3988EMSE#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3988EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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