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Analog Devices Inc. LT3988IMSE#PBF
- Part No.:
- LT3988IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3988IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
LT3988IMSE#PBF 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#PBF datasheet, LT3988IMSE#PBF pinout, LT3988IMSE#PBF application, or LT3988IMSE#PBF equivalent, key selection criteria include its dual-channel 60V input rating, 1A per channel output capability, programmable 250kHz–2.5MHz switching frequency, thermal performance in the MSOP-16EP package, and robust protection features including overvoltage lockout (80V transient), cycle-by-cycle current limiting, and thermal shutdown.
Technical Context
The LT3988IMSE#PBF implements a constant-frequency current-mode PWM architecture with two synchronized but anti-phase switching channels, each featuring an internal bipolar NPN power switch, integrated boost diode drive, and dedicated feedback (FB1/FB2) and track/soft-start (TRACK/SS1/SS2) pins. Its oscillator is set via RT resistor or external SYNC signal, enabling precise frequency control across 250kHz–2.5MHz.
Protection is implemented through VIN1/VIN2 undervoltage lockout (UVLO), VIN1 overvoltage lockout (OVLO) up to 66V, DA pin overload detection (1.32A threshold), and thermal shutdown. The BD pin enables efficient biasing from a lower-voltage rail (≥3V), reducing quiescent dissipation while supporting dual-supply or cascaded input configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.1V to 60V continuous; withstands 80V nonrepetitive 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 with independent voltage domains. |
| Switching Frequency Range | 250kHz to 2.5MHz (set by RT resistor or SYNC signal) - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI compliance. |
| Feedback Reference Voltage | 0.750V ±15mV (–40°C to 125°C) - enables accurate output programming with standard resistor dividers; low drift ensures stable regulation across temperature. |
| Quiescent Current (VIN1) | 1.6mA (typ, VBD = 5V) - minimizes standby loss in always-on systems such as telematics or remote I/O modules. |
| Shutdown Current | 0.1µA (max) - supports ultra-low-power wake-on-event architectures in battery-backed applications. |
| Thermal Performance | θJA = 40°C/W, θJC = 10°C/W (MSOP-16EP) - exposed pad soldering enables reliable operation at full load in compact industrial enclosures. |
Pinout & Package
The LT3988IMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package with exposed pad (Pin 17 = GND), requiring PCB soldering of the pad for thermal and electrical integrity. Package dimensions: 4.0mm × 5.0mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA1, DA2 | Diode anode sense inputs | Detect external Schottky catch diode current; disable switching if >1.32A - protects against short-circuit and overload faults without external sensing circuitry. |
| SW1, SW2 | Internal switch outputs | Drive external inductors and catch diodes; rated for 1A continuous, 2.25A peak current - defines maximum achievable output power per channel. |
| BOOST1, BOOST2 | Boost capacitor drive nodes | Provide gate drive voltage >VIN to internal NPN switches via external bootstrap capacitors - enables high-side NPN operation with low VCE(sat). |
| FB1, FB2 | Output voltage feedback inputs | Regulated to 0.750V reference; connect resistor divider from VOUT to GND - sets output voltage precisely (e.g., R1 = 6.8kΩ, R2 = 1.5kΩ → 5.0V). |
| TRACK/SS1, TRACK/SS2 | Soft-start and output tracking control | Accept external capacitor for soft-start ramp or resistor divider for ratiometric tracking - prevents inrush current and ensures orderly power-up sequencing. |
| EN/UVLO | Enable and undervoltage lockout input | Active-high enable; also accepts resistor divider from VIN1 for programmable UVLO threshold (e.g., 10V turn-on) - adds system-level brownout protection. |
| VIN1, VIN2 | Independent input supply pins | VIN1 powers internal circuitry and Channel 1; VIN2 powers Channel 2 only - supports dual-input or cascaded topologies (e.g., VIN2 = VOUT1). |
| RT | Oscillator frequency setting | Connect resistor to GND to set switching frequency (250kHz–2.5MHz); tolerance directly impacts freq accuracy - enables EMI tuning and layout optimization. |
| SYNC | External clock synchronization input | Accepts logic-level signal (1.5V–5V, ≥100ns pulse width); overrides RT setting - allows deterministic timing alignment in multi-converter systems. |
| BD | Boost diode bias supply | Must be connected to ≥3V rail (e.g., VOUT); reduces VIN1 quiescent current and improves efficiency - critical for high-VIN, low-IQ operation. |
| GND | Power and signal ground | Exposed pad (Pin 17) is GND; must be soldered to PCB thermal plane - provides low-impedance return path and dissipates >80% of heat generated. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 1A synchronous buck regulators | Two fully independent channels with internal NPN switches, eliminating need for external MOSFETs or driver ICs - reduces BOM count and board area in dual-rail designs. |
| Anti-phase switching | 180° phase shift between SW1 and SW2 reduces RMS input ripple current by ~30% - lowers required input capacitance and eases EMI filter design. |
| Integrated boost diodes | On-die Schottky diodes charge external BOOST capacitors - eliminates discrete boost diodes and simplifies layout while maintaining high efficiency at high VIN. |
| Programmable UVLO/OVLO | VIN1 UVLO = 4.1V (rising), OVLO = 64V (rising); EN/UVLO pin allows custom thresholds - enables robust operation across wide automotive and industrial input ranges. |
| Thermally enhanced MSOP-16EP | θJC = 10°C/W with exposed pad soldered - sustains 1A/channel output at ambient up to 85°C without heatsink in typical 2-layer PCB layouts. |
Applications
| Commercial Vehicle Power Management | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 24V or 48V truck/bus battery to 5V/3.3V for infotainment head units, ADAS cameras, and CAN gateway modules. IC Role / Device Role / Timing Role: Dual-output primary DC/DC regulator providing isolated, sequenced, and ripple-reduced rails directly from unregulated vehicle battery with transient ride-through. Use Value: Withstands 80V load-dump transients and operates down to 4.1V cold-crank voltage - eliminates need for external TVS or pre-regulator stages. | Use Scenario: Powering PLC I/O modules, motor drives, and fieldbus interfaces in factory automation cabinets with 24V DC distribution. IC Role / Device Role / Timing Role: Compact dual-buck controller delivering independent 5V logic and 3.3V communication rails from shared 24V supply with minimal footprint. Use Value: Anti-phase operation cuts input capacitor requirements by 40%; integrated compensation avoids external op-amps - accelerates design and improves long-term stability. |
| High-Voltage Industrial Sensors | Ruggedized Embedded Computing |
Use Scenario: Supplying precision analog front-ends and low-noise ADCs in oil & gas downhole tools powered from 48V–60V isolated supplies. IC Role / Device Role / Timing Role: Primary point-of-load regulator with tight output tolerance (±1%) and low 100kHz–1MHz ripple - preserves signal integrity in high-resolution measurement chains. Use Value: 0.750V reference with <15mV drift over –40°C to 125°C ensures consistent ADC reference scaling across environmental extremes. | Use Scenario: Powering ARM-based edge controllers and FPGA-based vision processors in outdoor kiosks or railway signaling equipment. IC Role / Device Role / Timing Role: Dual-channel PMIC managing core logic (1.2V/1.8V) and I/O (3.3V/5V) rails with coordinated soft-start and fault reporting. Use Value: TRACK/SS pins enable precise power sequencing; DA pin overload detection replaces discrete current monitors - increases reliability in mission-critical deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel high-input-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3649EMSE#PBF | Single-channel, 40V max input, 4A output; no integrated boost diodes; requires external bootstrap diodes. | Higher single-rail current, lower input voltage range; lacks dual-channel integration and anti-phase benefit. | Select when needing >2A per rail or tighter output tolerance (±0.5%), but accept larger solution size and added components. |
| TPS65321A-Q1 | Automotive AEC-Q100 qualified; 65V max input; dual 1.5A channels; integrated LDOs; SPI interface for telemetry. | Includes diagnostics, watchdog, and fault reporting; higher cost; larger QFN package (5mm × 6mm). | Select for ASIL-B automotive systems requiring functional safety support and real-time monitoring - not drop-in compatible due to pinout and control interface differences. |
Compared with LTC3649EMSE#PBF and TPS65321A-Q1, the LT3988IMSE#PBF uniquely combines dual 1A channels, 60V input, integrated boost diodes, and anti-phase operation in a compact MSOP-16EP - making it optimal for space-constrained industrial and commercial vehicle applications where simplicity, thermal efficiency, and transient robustness are prioritized over telemetry or automotive qualification.
Availability
LT3988IMSE#PBF is available at Aetrix Electronics and suitable for commercial vehicle battery regulation, industrial distributed power, and high-voltage sensor supply applications requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term industrial lifecycle support.
Supply support for LT3988IMSE#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. (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 specifically for rugged dual-output DC/DC conversion in high-input-voltage environments such as transportation, industrial control, and energy infrastructure - emphasizing transient robustness, thermal efficiency, and integration to reduce system complexity.
FAQ
What is the maximum input voltage rating for the LT3988IMSE#PBF, and how does it handle transients?
The LT3988IMSE#PBF has a continuous input voltage rating of 60V on VIN1 and VIN2, with absolute maximum ratings of 80V for nonrepetitive 1-second transients. Its built-in overvoltage lockout (OVLO) activates at 64V (typ) on VIN1, shutting down both channels to protect downstream circuitry. This makes the LT3988IMSE#PBF suitable for 24V and 48V commercial vehicle and industrial bus applications where load dump or surge events occur. The LT3988IMSE#PBF maintains regulation during brief transients below the OVLO threshold without latch-off.
Can the LT3988IMSE#PBF operate with only one input supply, or does it require separate VIN1 and VIN2 sources?
The LT3988IMSE#PBF supports both configurations: it can operate with a single input applied to VIN1 (with VIN2 tied to VIN1), or with independent supplies on VIN1 and VIN2 - enabling cascaded topologies (e.g., VIN2 = VOUT1). VIN1 must exceed 3.9V (typ) for either channel to function; VIN2 must exceed 2.6V (typ) for Channel 2 operation. The LT3988IMSE#PBF's dual-input flexibility simplifies power architecture in systems with multiple voltage domains or redundancy requirements.
How is the switching frequency programmed on the LT3988IMSE#PBF, and what is the valid range?
The LT3988IMSE#PBF switching frequency is set either by connecting a resistor from the RT pin to GND (250kHz–2.5MHz range) or by applying a logic-level clock signal to the SYNC pin (0.25MHz–2.5MHz). The RT resistor value is calculated using RT = 1.31/f² + 46.56/f − 7.322 (f in MHz, RT in kΩ). When using SYNC, the RT resistor must still be installed and set to yield a frequency within ±25% of the sync signal - ensuring proper slope compensation. The LT3988IMSE#PBF maintains stable operation across the full range without mode switching artifacts.
What thermal considerations apply to the LT3988IMSE#PBF in continuous 1A-per-channel operation?
The LT3988IMSE#PBF uses a 16-lead MSOP package with an exposed pad (Pin 17 = GND) that must be soldered to a PCB thermal plane. With θJA = 40°C/W and θJC = 10°C/W, it can sustain 1A per channel continuously at ambient temperatures up to 85°C on a standard 2-layer board with ≥2 cm² copper pour under the pad. For full 125°C junction operation, a 4-layer board with internal ground planes and thermal vias is recommended. The LT3988IMSE#PBF includes thermal shutdown that activates above 165°C (typ) to prevent permanent damage.
Does the LT3988IMSE#PBF support output voltage tracking or sequencing, and how is it implemented?
Yes, the LT3988IMSE#PBF supports precise output voltage tracking and soft-start via the TRACK/SS1 and TRACK/SS2 pins. To sequence outputs, connect a resistor divider from the master output (e.g., VOUT1) to TRACK/SS2; the slave channel (Channel 2) will regulate to match the divider ratio. For soft-start, connect a capacitor from TRACK/SSx to GND - an internal –1.2µA current source ramps the voltage, controlling rise time. Both functions are independent per channel. The LT3988IMSE#PBF enables zero-crossing start-up and controlled ramp rates without external timers or supervisors.
LT3988IMSE#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
LT3988IMSE#PBF FAQ
1.How can I place an order for LT3988IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3988IMSE#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 LT3988IMSE#PBF reliable?
The price and inventory of LT3988IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3988IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3988IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3988IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3988IMSE#PBF?
LT3988IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3988IMSE#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 LT3988IMSE#PBF?
For technical support, including LT3988IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3988IMSE#PBF requirements.
6.How does Aetrix verify that LT3988IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3988IMSE#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 LT3988IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3988IMSE#PBF?
All LT3988IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3988IMSE#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 LT3988IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3988IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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