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Analog Devices Inc. LT3988HMSE#TRPBF
- Part No.:
- LT3988HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3988HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,179
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Product details
Overview
LT3988HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual monolithic 60V-input, 1A-per-channel synchronous 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 LT3988HMSE#TRPBF datasheet, LT3988HMSE#TRPBF pinout, LT3988HMSE#TRPBF application, or LT3988HMSE#TRPBF equivalent, key selection considerations include its –40°C to 150°C junction-rated H-grade MSOP-16 package, dual-channel current-mode control with 0.75V FB reference, 80V transient tolerance on VIN1, and programmable frequency via RT resistor or SYNC input.
Technical Context
The LT3988HMSE#TRPBF implements two independent current-mode PWM regulators sharing a master oscillator, with 180° phase offset to reduce input capacitor RMS current. Each channel uses bipolar NPN switches driven by BOOST pins, with DA pins enabling cycle-by-cycle overcurrent detection via external Schottky diode anode sensing.
It integrates undervoltage lockout (VIN1: 4.1V typ, VIN2: 2.6V typ), overvoltage protection (60V continuous, 80V transient), thermal shutdown, and frequency foldback during overload - all operating within a guaranteed –40°C to 150°C junction temperature range for automotive and harsh-environment use.
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 commercial vehicle batteries without pre-regulation. |
| Output Current per Channel | 1A continuous - supports dual-rail microcontroller or FPGA core/I/O supply generation from single high-voltage source. |
| 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 | 0.75V ±1.5% over temperature - enables precise output regulation with standard resistor dividers; low drift minimizes output error across –40°C to 150°C. |
| Junction Temperature Range | –40°C to 150°C (H-grade) - qualified for under-hood automotive and high-ambient industrial applications where thermal derating is critical. |
| Quiescent Current (VIN1) | 1.6mA typ at VBD = 5V - ensures low no-load power loss in always-on systems such as telematics or sensor hubs. |
| Shutdown Current | <1µA - enables deep sleep modes in battery-backed systems without significant leakage drain. |
Pinout & Package
The LT3988HMSE#TRPBF is housed in a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17), which must be soldered to PCB ground for thermal and electrical integrity (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA1, DA2 | Diode Anode Sense Inputs | Detect external Schottky diode anode voltage to disable switching if current exceeds 1.32A - provides short-circuit robustness without external sense resistors. |
| SW1, SW2 | Power Switch Outputs | Drive external inductors and catch diodes; each connects to internal NPN switch collector - requires low-inductance layout to minimize switching losses and EMI. |
| BOOST1, BOOST2 | Bootstrap Drive Supplies | Provide >VIN gate drive to internal NPN switches via external capacitors - enable efficient saturation of bipolar transistors at high input voltages. |
| FB1, FB2 | Feedback Inputs | Regulated to 0.75V; connect to resistor divider taps - sets output voltage as VOUT = 0.75V × (1 + R1/R2); bias current <100nA minimizes divider error. |
| TRACK/SS1, TRACK/SS2 | Soft-Start / Tracking Control | Accept external capacitor for soft-start ramp or resistor divider for output tracking - ensures controlled power-up sequencing between rails. |
| EN/UVLO | Enable / Undervoltage Lockout | Logic-compatible input; enables operation above 1.2V (typ), disables below 0.5V (typ); also accepts resistor divider from VIN1 for programmable UVLO threshold. |
| RT | Oscillator Frequency Set | Connect resistor to GND to program switching frequency from 250kHz to 2.5MHz - eliminates need for external clock generator in most designs. |
| SYNC | External Clock Input | Accepts 0.25–2.5MHz logic-level signal with ≥100ns pulse widths - enables synchronization to system clock for EMI reduction or multi-converter coordination. |
| VIN1, VIN2 | Input Power Supplies | VIN1 powers internal circuitry and Channel 1 switch; VIN2 powers Channel 2 switch - supports independent or cascaded inputs; VIN2 must tie to VIN1 if >60V. |
| BD | Boost Diode Supply | Connects to ≥3V supply (e.g., VOUT) to power internal boost diodes - reduces quiescent current draw from VIN1 and improves efficiency. |
| GND | Ground Reference | Exposes thermal pad (Pin 17) tied to GND - mandatory soldering required for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 1A monolithic buck regulators | Integrates two complete 60V-input, 1A-output DC/DC channels with internal NPN switches, eliminating four external MOSFETs and associated gate drivers. |
| Anti-phase switching | Reduces input ripple current by ~70% compared to in-phase operation - allows smaller input bulk capacitors and lower EMI filter cost. |
| Integrated boost diodes and loop compensation | Removes need for four external bootstrap diodes and external compensation network - simplifies layout and improves stability across load/temperature. |
| 80V transient tolerance on VIN1 | Withstands load-dump events common in 24V commercial vehicles without external TVS - reduces BOM count and board space in automotive power systems. |
| Thermally enhanced MSOP-16 with exposed pad | Enables 150°C junction operation with minimal thermal resistance (θJC = 10°C/W) - supports high-power density designs in confined enclosures. |
Applications
| Commercial Vehicle Battery Regulation | Industrial Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 24V or 48V truck/bus battery rail to generate 5V for infotainment and 3.3V for CAN controllers under wide temperature and load-dump conditions. IC Role / Device Role / Timing Role: Dual-channel primary DC/DC regulator providing isolated, sequenced, and ripple-reduced outputs directly from unregulated battery. Use Value: Eliminates need for discrete pre-regulators and external current-sense circuits while maintaining operation through 80V transients and –40°C to 150°C ambient. | Use Scenario: Powering PLC I/O modules and fieldbus interfaces in factory automation cabinets where 24V DC distribution is standard but local regulation must survive brownouts and surges. IC Role / Device Role / Timing Role: Dual-output point-of-load regulator delivering stable 5V and 3.3V rails with anti-phase switching to reduce input capacitor stress. Use Value: Achieves <1µA shutdown current and 1.6mA quiescent current to extend backup battery life, while UVLO/OVLO thresholds prevent malfunction during line sags or spikes. |
| Automotive Telematics Power Management | Harsh-Environment Sensor Hub Supply |
Use Scenario: Providing always-on 3.3V and switched 5V rails for GPS, cellular modem, and MCU in vehicle black-box recorders mounted near engine compartments. IC Role / Device Role / Timing Role: High-temp-rated dual buck controller managing power sequencing, fault response, and thermal safety in compact sealed enclosures. Use Value: H-grade 150°C junction rating and integrated thermal shutdown ensure reliable operation without forced air cooling or oversized heatsinks. | Use Scenario: Powering MEMS accelerometers, pressure sensors, and wireless transceivers in oil/gas downhole tools or railway trackside monitoring units exposed to extreme ambient temperatures. IC Role / Device Role / Timing Role: Primary DC/DC converter converting 12–60V input to precision dual outputs with low-drift feedback and minimal external components. Use Value: 0.75V FB reference with ±1.5% tolerance over –40°C to 150°C ensures output accuracy without calibration, reducing test time and field failure risk. |
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 |
|---|---|---|---|
| LTC3892EMSE#PBF | Dual-channel, 60V input, but uses external N-channel MOSFETs; no integrated switches or boost diodes; requires gate drivers and external bootstrap circuitry. | Better suited for >1A per channel or higher efficiency needs where discrete FET selection is desired; lacks integrated DA-based short-circuit protection. | Select LTC3892EMSE#PBF when output current exceeds 1A or when design requires adjustable current limit and higher peak efficiency at light loads. |
| LM5165QPWPRQ1 | Single-channel, 65V input, 150mA output; not dual; no anti-phase capability; uses integrated N-channel MOSFET but lacks boost diodes and DA sensing. | Only suitable for low-power auxiliary rails; cannot replace LT3988HMSE#TRPBF's dual 1A functionality or robust fault handling. | Consider LM5165QPWPRQ1 only for secondary low-current bias rails where size and BOM count outweigh performance requirements. |
Compared with LTC3892EMSE#PBF and LM5165QPWPRQ1, the LT3988HMSE#TRPBF uniquely combines dual 1A monolithic integration, anti-phase operation, DA-based short-circuit protection, and H-grade 150°C operation - making it the only drop-in solution for compact, high-reliability dual-rail automotive and industrial supplies.
Availability
LT3988HMSE#TRPBF is available at Aetrix Electronics and suitable for commercial vehicle battery regulation, industrial distributed supply regulation, and harsh-environment sensor hub applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3988HMSE#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) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving automotive, industrial, communications, and aerospace markets.
The LT3988 product line was designed specifically for dual-output, high-input-voltage DC/DC conversion in space-constrained, thermally demanding environments - emphasizing integration, transient robustness, and guaranteed operation up to 150°C junction temperature.
FAQ
What is the maximum continuous input voltage rating for the LT3988HMSE#TRPBF?
The LT3988HMSE#TRPBF has a maximum continuous input voltage rating of 60V on VIN1 and VIN2. It tolerates nonrepetitive 80V transients for up to 1 second on VIN1, making it suitable for 24V and 48V commercial vehicle battery systems subject to load-dump events. VIN2 must be connected to VIN1 if driven above 60V.
Does the LT3988HMSE#TRPBF require external bootstrap diodes?
No, the LT3988HMSE#TRPBF integrates internal boost diodes connected between the BD pin and BOOST1/BOOST2 pins. When BD is supplied with ≥3V (e.g., from VOUT), these diodes eliminate the need for four external bootstrap diodes - reducing component count, layout complexity, and potential failure points in high-reliability designs.
How does the LT3988HMSE#TRPBF achieve anti-phase switching between its two channels?
The LT3988HMSE#TRPBF uses an internal master oscillator with dedicated circuitry to generate complementary 180° out-of-phase clock signals for SW1 and SW2. This phase offset is fixed and inherent to the IC architecture - no external configuration is required. Measured phase difference is 150° to 210° across temperature and load, ensuring consistent input ripple reduction.
What is the function of the DA1 and DA2 pins on the LT3988HMSE#TRPBF?
The DA1 and DA2 pins on the LT3988HMSE#TRPBF monitor the anode voltage of external Schottky catch diodes. If current through the diode exceeds 1.32A (typ), the corresponding channel shuts down until current falls below threshold - providing cycle-by-cycle overcurrent protection without external sense resistors or complex fault logic.
Is the LT3988HMSE#TRPBF pin-compatible with other grades like LT3988EMSE#TRPBF or LT3988IMSE#TRPBF?
Yes, the LT3988HMSE#TRPBF is pin-compatible and footprint-compatible with LT3988EMSE#TRPBF and LT3988IMSE#TRPBF - all use the same 16-lead MSOP package with exposed pad. The only difference is the guaranteed operating junction temperature range: E-grade (0°C to 125°C), I-grade (–40°C to 125°C), and H-grade (–40°C to 150°C). Electrical specifications are identical across grades.
LT3988HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3988HMSE#TRPBF FAQ
1.How can I place an order for LT3988HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3988HMSE#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 LT3988HMSE#TRPBF reliable?
The price and inventory of LT3988HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3988HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3988HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3988HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3988HMSE#TRPBF?
LT3988HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3988HMSE#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 LT3988HMSE#TRPBF?
For technical support, including LT3988HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3988HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3988HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3988HMSE#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 LT3988HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3988HMSE#TRPBF?
All LT3988HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3988HMSE#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 LT3988HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3988HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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