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Analog Devices Inc. LT1936HMS8E#PBF
- Part No.:
- LT1936HMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1936HMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.4A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:323
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Product details
Overview
LT1936HMS8E#PBF from Analog Devices (formerly Linear Technology) is a high-temperature, current-mode PWM step-down DC/DC converter with an integrated 1.9A bipolar NPN power switch, operating at a fixed 500kHz switching frequency across a 3.6V–36V input range and delivering up to 1.4A at 3.3V or 5V output. It features internal/external compensation, soft-start, cycle-by-cycle current limiting, and thermal shutdown - designed for automotive battery regulation, industrial control supplies, and unregulated wall adapters.
For engineers reviewing the LT1936HMS8E#PBF datasheet, LT1936HMS8E#PBF pinout, LT1936HMS8E#PBF application, or LT1936HMS8E#PBF equivalent, key selection criteria include guaranteed 1.9A minimum switch current, –40°C to +150°C operating junction temperature, 1.200V ±15mV feedback reference, 500kHz fixed-frequency operation, and thermally enhanced 8-lead MSOP package with exposed GND pad.
Technical Context
The LT1936HMS8E#PBF implements constant-frequency current-mode control using an RS flip-flop driven by a 500kHz oscillator and a current-sense amplifier/comparator monitoring VIN-to-SW conduction. Its error amplifier servos the VC pin to regulate FB at 1.200V, with active clamping on VC enabling current limit and soft-start via SHDN voltage ramping.
It employs a bipolar NPN power switch driven either from VIN or from the BOOST pin, requiring an external boost capacitor and diode to generate >VIN drive voltage - enabling full saturation and low VCE(SAT) (~410mV at 1.2A). Frequency foldback activates when FB voltage drops, reducing switching frequency during overload or startup to limit output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports direct regulation from automotive batteries (12V/24V), industrial 24V rails, and unregulated AC/DC adapters. |
| Output Current Capability | 1.4A at 3.3V (from 7V–36V input) or 5V (from 10V–36V input) - enables compact point-of-load conversion without external MOSFETs. |
| Switch Current Limit | 1.9A minimum (guaranteed), 2.2A typical - provides robust short-circuit protection across full input range and temperature. |
| Feedback Reference Voltage | 1.200V ±15mV (–40°C to +150°C) - enables precise output setting via resistor divider; stable over full H-grade temperature range. |
| Switching Frequency | 500kHz fixed (±100kHz) - allows use of small 6.8–15μH inductors and ceramic output capacitors, minimizing board area and EMI filter size. |
| Junction Temperature Range | –40°C to +150°C - qualified for under-hood automotive, high-ambient industrial, and thermally constrained embedded systems. |
| Shutdown Current | <2μA - enables ultra-low-power state management in battery-backed or energy-harvesting applications. |
Pinout & Package
LT1936HMS8E#PBF is housed in a thermally enhanced 8-lead MSOP package (MS8E) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane and thermal vias for reliable operation at 150°C junction temperature. θJA = 40°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Bootstrap drive voltage supply | Provides >VIN gate drive to internal bipolar NPN switch; requires external 0.22μF capacitor and fast diode tied to SW or VOUT. |
| VIN (2) | Main power input | Supplies internal regulator and power switch; must be locally bypassed with ≥4.7μF X7R/X5R ceramic capacitor. |
| SW (3) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor; carries high di/dt pulsed current - critical for layout and EMI control. |
| GND (4) | Analog and power ground | Reference for FB divider, VC compensation, and internal circuitry; must tie to low-impedance ground plane beneath IC and components. |
| SHDN (5) | Enable/soft-start control | Logic-high (>2.3V) enables operation; grounded disables converter and reduces IQ to <2μA; RC network here implements controlled start-up. |
| FB (6) | Feedback input | Regulated to 1.200V; sets output voltage via R1/R2 divider (VOUT = 1.200V × (1 + R1/R2)); bias current ≤300nA (H grade). |
| VC (7) | Control loop compensation node | Output of error amplifier; connects to external RC network (or internal 50kΩ/150pF) to stabilize current-mode loop and optimize transient response. |
| COMP (8) | Internal compensation enable | Tie to VC to activate internal 50kΩ/150pF network; otherwise connect to GND or leave floating for external compensation. |
| Exposed Pad (9) | Thermal and electrical ground | Must be soldered to PCB GND plane with multiple thermal vias; primary path for heat dissipation in high-power operation. |
Key Features
| Feature | Design Value |
|---|---|
| Thermally enhanced MSOP-8 with exposed GND pad | Enables 1.4A continuous output at +150°C junction temperature with standard PCB copper and thermal vias - no heatsink required. |
| Fixed 500kHz switching frequency | Permits consistent EMI filtering design and predictable ripple; avoids audible noise while enabling <10mm² total solution size with ceramic passives. |
| Cycle-by-cycle current limit + frequency foldback | Prevents thermal runaway during output short or overload - maintains safe switch dissipation without external current-sense resistors. |
| Internal or external compensation | Reduces BOM count and layout area (internal RC) or enables fine-tuned transient response and stability margin (external RC). |
| Soft-start via SHDN pin | Eliminates inrush current surge during power-up by ramping VC voltage - prevents input rail collapse and output overshoot. |
| Undervoltage lockout (UVLO) | Disables switching below ~3.45V input, preventing erratic operation and ensuring clean start-up from weak or recovering sources like cold-cranking batteries. |
Applications
| Automotive Battery Regulation | Industrial Control Power Supply |
|---|---|
|
Use Scenario: Regulating 12V or 24V vehicle battery to stable 3.3V/5V for infotainment MCU, CAN transceiver, or sensor interface in engine bay or cabin. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled DC power with short-circuit and thermal protection under wide ambient (-40°C to +125°C ambient, +150°C junction). Use Value: Eliminates need for discrete high-temp MOSFET + controller; withstands load dump (40V transients) and cold-crank (4.5V min) per ISO 16750-2. |
Use Scenario: Generating 5V/1.4A from 24V factory floor PLC or motor drive power rail to feed isolated I/O modules, fieldbus interfaces, or microcontrollers. IC Role / Device Role / Timing Role: High-reliability, self-protected step-down regulator operating continuously at elevated ambient temperatures (>85°C) near heat-generating equipment. Use Value: Delivers full rated current at +150°C junction without derating; internal current limit and thermal shutdown prevent field failures due to dust-clogged heatsinks or airflow loss. |
| Unregulated Wall Adapter Interface | High-Temperature Embedded System Power |
|
Use Scenario: Converting noisy, loosely regulated 9–36V wall adapter output into clean 3.3V for Wi-Fi SoC or real-time OS processor in smart home gateway or PoE-powered device. IC Role / Device Role / Timing Role: Input-stage DC/DC converter absorbing line transients and ripple, enabling downstream LDOs or PMICs to maintain tight voltage tolerance. Use Value: 500kHz operation minimizes low-frequency ripple; ceramic input/output caps ensure low-noise, compact design without electrolytics. |
Use Scenario: Powering FPGA configuration logic or ARM Cortex-M7 core in sealed, fanless edge AI box deployed in desert or industrial oven environments. IC Role / Device Role / Timing Role: Primary power source with guaranteed operation up to +150°C junction - critical where ambient exceeds 105°C and forced cooling is unavailable. Use Value: H-grade qualification ensures long-term reliability without thermal throttling; exposed pad + thermal vias provide predictable thermal resistance in conformal-coated assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | 42V input, 1.2A max, 3MHz sync buck; uses MOSFET switch, lower IQ (25μA), no BOOST pin required. | Better efficiency at light loads; unsuitable for >1.2A or bipolar-switch thermal robustness at 150°C. | Select LTC3632EMSE#PBF only if higher frequency, lower quiescent current, or MOSFET-based efficiency are prioritized over 1.4A output and extreme-temperature resilience. |
| LM5164QPWPRQ1 | 65V input, 1A max, 1MHz sync buck; integrated high-side MOSFET, 1.5μA shutdown current, AEC-Q100 Grade 1. | Higher input voltage rating and automotive qualification; lower output current and no H-grade (–40°C to +125°C only). | Choose LM5164QPWPRQ1 for automotive systems requiring AEC-Q100 compliance and >42V input tolerance, but not for 1.4A+ loads above 125°C ambient. |
Compared with LTC3632EMSE#PBF and LM5164QPWPRQ1, LT1936HMS8E#PBF uniquely delivers 1.4A output with guaranteed performance to +150°C junction temperature using a rugged bipolar switch - making it irreplaceable in high-current, high-temperature industrial and under-hood automotive designs where MOSFET-based alternatives derate significantly or lack thermal margin.
Availability
LT1936HMS8E#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control power supplies, and unregulated wall adapter interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1936HMS8E#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
LT1936HMS8E#PBF belongs to Linear's legacy high-voltage buck regulator product line, engineered specifically for harsh-environment power conversion - emphasizing thermal resilience, input voltage robustness, and integrated protection in minimal footprint.
FAQ
What is the maximum junction temperature specification for LT1936HMS8E#PBF?
The LT1936HMS8E#PBF is rated for a maximum junction temperature of +150°C, with full electrical specifications guaranteed across –40°C to +150°C. This H-grade qualification distinguishes it from E-grade (–40°C to +85°C) and I-grade (–40°C to +125°C) variants, enabling deployment in under-hood automotive and high-ambient industrial settings where thermal headroom is critical. The exposed pad must be soldered to a thermal plane to achieve this rating.
Does LT1936HMS8E#PBF require an external boost capacitor and diode?
Yes, LT1936HMS8E#PBF requires an external boost capacitor (typically 0.22μF) and fast-switching diode (e.g., 1N4148 or Schottky) connected between SW and BOOST pins. This generates a voltage >VIN at BOOST to fully saturate the internal bipolar NPN switch, minimizing VCE(SAT) and maximizing efficiency. Omitting or misrouting this network causes excessive switch heating and potential failure.
Can LT1936HMS8E#PBF operate with ceramic output capacitors only?
Yes, LT1936HMS8E#PBF is explicitly designed for ceramic output capacitors - its current-mode architecture does not rely on output capacitor ESR for stability. A minimum of 20μF (for 3.3V output) or 66×VOUT μF is recommended; X5R/X7R dielectrics are required. Electrolytic or polymer capacitors may be used but add size and ESR-related trade-offs.
What is the guaranteed minimum switch current limit for LT1936HMS8E#PBF?
The LT1936HMS8E#PBF guarantees a minimum switch current limit of 1.9A across its full operating temperature and input voltage range. This value is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, and enables reliable short-circuit protection without external sensing - a key differentiator versus controllers requiring external MOSFETs and sense resistors.
How does soft-start function on LT1936HMS8E#PBF?
Soft-start on LT1936HMS8E#PBF is implemented via the SHDN pin: applying an RC ramp (e.g., 1MΩ + 100nF) to SHDN creates a controlled voltage rise, which linearly increases the VC pin voltage and limits peak inductor current during startup. This eliminates input surge, prevents output overshoot, and avoids tripping upstream fuses - especially critical in battery-fed systems.
LT1936HMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (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:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 33.12V
- Current - Output:
- 1.4A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT1936HMS8E#PBF FAQ
1.How can I place an order for LT1936HMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1936HMS8E#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 LT1936HMS8E#PBF reliable?
The price and inventory of LT1936HMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1936HMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT1936HMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1936HMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1936HMS8E#PBF?
LT1936HMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1936HMS8E#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 LT1936HMS8E#PBF?
For technical support, including LT1936HMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1936HMS8E#PBF requirements.
6.How does Aetrix verify that LT1936HMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT1936HMS8E#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 LT1936HMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT1936HMS8E#PBF?
All LT1936HMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1936HMS8E#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 LT1936HMS8E#PBF part is unused and in its original packaging.
Return procedure for LT1936HMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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