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Analog Devices Inc. LT3988HMSE#PBF
- Part No.:
- LT3988HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3988HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A DL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:664
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Product details
Overview
LT3988HMSE#PBF from Analog Devices (formerly Linear Technology) is a dual monolithic 60V-input, 1A-output 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 to minimize input ripple - used in commercial vehicle battery regulation and industrial distributed supplies.
For engineers reviewing the LT3988HMSE#PBF datasheet, LT3988HMSE#PBF pinout, LT3988HMSE#PBF application, or LT3988HMSE#PBF equivalent, key selection considerations include its –40°C to 150°C junction-rated MSOP-16 package, dual-channel current-mode control with cycle-by-cycle limiting, programmable frequency via RT resistor or SYNC input, and integrated BD/BOOST architecture enabling high-efficiency operation across wide VIN ranges.
Technical Context
The LT3988HMSE#PBF implements a dual current-mode PWM architecture with independent error amplifiers, peak-current sensing per channel, and 180° out-of-phase switching driven by a single master oscillator. Each channel features dedicated FB pins regulated to 0.750V ±15mV, TRACK/SS pins supporting soft-start or output tracking, and DA pins providing overload detection via external Schottky anode sensing.
It integrates bipolar NPN power switches with on-chip boost diodes and BD-pin-controlled BOOST voltage generation, enabling efficient high-side drive without external bootstrap components. Overvoltage lockout (60V/80V transient) and undervoltage lockout (VIN1: 4.1V typ, VIN2: 2.6V typ) are implemented with hysteresis, and thermal shutdown activates above 150°C junction temperature - matching its H-grade rating.
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 rails. |
| Output Current per Channel | 1A continuous - supports dual-rail microcontroller or FPGA core/I/O supply generation without external pass devices. |
| 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 over –40°C to 150°C - ensures stable output regulation across full H-grade operating range. |
| Quiescent Current (VIN1) | 1.6mA to 4.5mA depending on BD voltage - low bias consumption supports always-on systems with minimal standby loss. |
| Shutdown Current | <1µA - enables deep sleep modes in battery-backed or energy-sensitive applications. |
| Junction Temperature Range | –40°C to 150°C - validated for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
The LT3988HMSE#PBF 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 | Monitor external Schottky catch diode anode voltage; disable switching if current exceeds 1.32A - provides short-circuit robustness without secondary sensing circuitry. |
| SW1, SW2 | Power switch outputs | Connect to inductors and catch diodes; integrate bipolar NPN switches rated for 1A continuous and 2.25A peak current limit. |
| BOOST1, BOOST2 | Internal switch gate drive supplies | Generated from BD pin and internal Schottky diodes; enable efficient high-side NPN drive without external bootstrap capacitors. |
| FB1, FB2 | Output voltage feedback inputs | Regulated to 0.750V reference; support resistor-divider programming of VOUT with ≤20kΩ parallel impedance to minimize bias error. |
| TRACK/SS1, TRACK/SS2 | Soft-start and output tracking control | Internal –1.2µA current source charges external capacitor for controlled ramp-up; also accepts external voltage for ratiometric or coincident sequencing. |
| EN/UVLO | Enable and undervoltage lockout input | Shuts down device below 1.2V (typ); configurable as precision UVLO using resistor divider from VIN1 - eliminates need for external supervisor IC. |
| RT | Oscillator frequency setting | Resistor-to-GND sets switching frequency from 250kHz to 2.5MHz per formula RT = 1.31/f² + 46.56/f – 7.322 (f in MHz, RT in kΩ). |
| SYNC | External clock synchronization input | Accepts 0.25–2.5MHz logic-level signal with ≥100ns pulse widths; enables deterministic EMI reduction and multi-converter phase alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Dual anti-phase switching | Reduces RMS input ripple current by ~70% versus in-phase operation - permits smaller input bulk capacitors and lower EMI filter cost. |
| Integrated boost diodes and BD pin control | Eliminates four external Schottky diodes and associated layout complexity; BD voltage ≥3V reduces VIN1 quiescent current and improves light-load efficiency. |
| Programmable frequency with SYNC capability | Enables precise EMI band placement and multi-rail synchronization without sacrificing design flexibility - critical for noise-sensitive instrumentation and communication systems. |
| Current-mode control with cycle-by-cycle limiting | Delivers fast transient response (<10µs typical) and inherent overload protection - maintains regulation during load steps up to 1A/µs without external compensation. |
| Thermally enhanced MSOP-16 with exposed pad | Supports 1A/channel continuous operation at 150°C junction temperature - validated for convection-cooled industrial and automotive under-hood mounting. |
Applications
| Commercial Vehicle Battery Regulation | Industrial Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to stable 5V and 3.3V for ADAS ECUs, telematics modules, and CAN gateway processors. IC Role / Device Role / Timing Role: Dual-output primary DC/DC controller managing both core logic and I/O rail generation with coordinated soft-start and fault isolation. Use Value: Withstands 80V load-dump transients and operates continuously at 150°C ambient - eliminates need for external TVS or derating in engine-compartment-mounted units. | Use Scenario: Providing isolated 5V and 3.3V supplies to PLC I/O modules, motor drives, and sensor interface cards in factory automation cabinets. IC Role / Device Role / Timing Role: Compact dual-buck regulator replacing discrete controllers and MOSFETs - simplifies BOM and reduces PCB area in space-constrained DIN-rail enclosures. Use Value: Anti-phase operation cuts input capacitor RMS current, allowing use of smaller 105°C X7R ceramics instead of larger aluminum electrolytics - extends lifetime in high-temperature cabinet environments. |
| High-Temperature Industrial Power | Robust Point-of-Load Conversion |
Use Scenario: Generating auxiliary rails in oil & gas downhole tools, turbine control systems, and power grid monitoring equipment exposed to >100°C ambient. IC Role / Device Role / Timing Role: H-grade dual buck converter delivering regulated outputs where standard commercial-grade ICs would fail due to thermal stress. Use Value: Guaranteed operation from –40°C to 150°C junction temperature - avoids thermal runaway and enables simplified thermal design without active cooling. | Use Scenario: Powering FPGAs, DSPs, and high-speed ADCs requiring tightly regulated, low-noise dual supplies with precise sequencing. IC Role / Device Role / Timing Role: Dual-channel current-mode regulator with TRACK/SS pins enabling ratiometric startup and independent soft-start timing. Use Value: Integrated loop compensation and 0.750V reference with ±15mV tolerance ensure <±1% output accuracy across temperature - meets strict analog and mixed-signal supply requirements. |
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#PBF | Dual synchronous buck controller (external MOSFETs); supports up to 60V input but requires external power stage; no integrated boost diodes or BD pin. | Better suited for >1A or high-efficiency (>95%) designs where thermal management allows discrete FETs; lacks integrated diodes and anti-phase optimization. | Select when higher output current, adjustable current limit, or PMBus telemetry is required - not a drop-in replacement due to external power stage dependency. |
| MPQ4420AGL-A-Z | Single 60V, 2A synchronous buck converter (Monolithic); no dual-output or anti-phase capability; different pinout and control architecture. | Applicable only for single-rail systems; requires two separate ICs to replicate dual-output functionality - increases BOM count and layout complexity. | Consider for cost-sensitive, single-output applications where footprint and simplicity outweigh dual-channel integration benefits. |
Compared with LTC3892EMSE#PBF, the LT3988HMSE#PBF offers monolithic integration and anti-phase ripple reduction but trades off programmable current limit and telemetry; versus MPQ4420AGL-A-Z, it delivers true dual-rail integration in one package but at higher unit cost and fixed 1A per channel.
Availability
LT3988HMSE#PBF is available at Aetrix Electronics and suitable for commercial vehicle battery regulation, industrial distributed supply regulation, and high-temperature embedded power applications requiring stable component supply across extended temperature lifecycles.
Supply support for LT3988HMSE#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, serving industrial, automotive, communications, and healthcare markets.
The LT3988 product line was designed as a monolithic dual buck solution for harsh-environment power conversion - specifically targeting applications needing wide-input, high-temperature operation with minimal external components and predictable EMI behavior.
FAQ
What is the maximum continuous input voltage rating for the LT3988HMSE#PBF?
The LT3988HMSE#PBF is rated for continuous operation up to 60V on VIN1 and VIN2. It tolerates nonrepetitive 80V transients for up to 1 second, as specified in Absolute Maximum Ratings. Exceeding 60V continuously may trigger overvoltage lockout and shut down regulation - this behavior is guaranteed across the full –40°C to 150°C junction temperature range for the H-grade LT3988HMSE#PBF.
Does the LT3988HMSE#PBF require external bootstrap capacitors for high-side switch drive?
No, the LT3988HMSE#PBF does not require external bootstrap capacitors. It integrates internal Schottky boost diodes connected between the BD pin and BOOST1/BOOST2 pins, and uses the BD-supplied voltage to generate gate drive above VIN. When BD ≥3V, the internal circuitry draws bias current from BD instead of VIN1, reducing losses and eliminating external bootstrap components - a key differentiator of the LT3988HMSE#PBF architecture.
How is output voltage programmed on the LT3988HMSE#PBF?
Output voltage is programmed using resistor dividers from each VOUT to its respective FB pin (FB1 or FB2), with the LT3988HMSE#PBF regulating the FB node to 0.750V ±15mV. The formula is R1 = R2 × (VOUT / 0.75V – 1), and the parallel resistance of R1||R2 must be ≤20kΩ to limit bias current error. This method applies identically to both channels of the LT3988HMSE#PBF and is validated over its full operating temperature range.
Can the LT3988HMSE#PBF synchronize both channels to an external clock?
Yes, the LT3988HMSE#PBF supports full-range synchronization: a logic-level clock signal (0.25–2.5MHz, ≥100ns pulse widths) applied to the SYNC pin synchronizes both channels' switching to the external source while maintaining 180° phase separation. The RT pin must still be terminated with a resistor set to within ±25% of the target sync frequency to ensure proper slope compensation - this dual-control requirement is inherent to the LT3988HMSE#PBF's architecture.
What thermal derating applies to the LT3988HMSE#PBF at 150°C junction temperature?
The LT3988HMSE#PBF is fully specified and guaranteed for continuous operation at 150°C junction temperature - no derating is required for output current or switching frequency. Its H-grade qualification includes characterization and correlation across –40°C to 150°C, with parameters like FB voltage (0.750V ±15mV), current limit (≥1.5A at low duty cycle), and shutdown threshold all validated at max temperature. This distinguishes the LT3988HMSE#PBF from E- or I-grade variants.
LT3988HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3988HMSE#PBF FAQ
1.How can I place an order for LT3988HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3988HMSE#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 LT3988HMSE#PBF reliable?
The price and inventory of LT3988HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3988HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3988HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3988HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3988HMSE#PBF?
LT3988HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3988HMSE#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 LT3988HMSE#PBF?
For technical support, including LT3988HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3988HMSE#PBF requirements.
6.How does Aetrix verify that LT3988HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3988HMSE#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 LT3988HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3988HMSE#PBF?
All LT3988HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3988HMSE#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 LT3988HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3988HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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