My Inquiry
My Account
Analog Devices Inc. LT1936HMS8E#TRPBF
- Part No.:
- LT1936HMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1936HMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.4A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,019
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1936HMS8E#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM step-down DC/DC converter with an internal 1.9A bipolar NPN power switch, operating at 500kHz fixed frequency over 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 limit, and thermal shutdown-designed for automotive battery regulation, industrial control supplies, and unregulated wall adapters.
For engineers reviewing the LT1936HMS8E#TRPBF datasheet, LT1936HMS8E#TRPBF pinout, LT1936HMS8E#TRPBF application, or LT1936HMS8E#TRPBF equivalent, key selection criteria include guaranteed 1.9A switch current, –40°C to 150°C operating junction temperature, 1.200V ±15mV feedback reference, <2μA shutdown current, and thermally enhanced 8-lead MSOP package with exposed GND pad.
Technical Context
The LT1936HMS8E#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and RS flip-flop to drive its bipolar NPN switch. Current sensing occurs between VIN and SW pins, with VC pin voltage determining switch-off threshold via error amplifier servoing of the FB node to 1.200V.
Protection includes cycle-by-cycle current limiting (1.9A min), frequency foldback during overload, thermal shutdown (150°C max junction), and undervoltage lockout (~3.45V). Soft-start is implemented via SHDN pin voltage ramping, while BOOST pin supplies >VIN gate drive to ensure full saturation of the internal switch.
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 | 1.4A at 3.3V (7V–36V input) or 5V (10V–36V input) - sufficient for powering microcontrollers, sensors, and interface ICs in harsh environments. |
| Switch Current Limit | 1.9A minimum - ensures robust short-circuit protection across full input range and temperature. |
| Feedback Reference | 1.200V ±15mV - enables precise output voltage setting down to 1.20V with external resistor divider. |
| Shutdown Current | <2μA - critical for low-power battery-backed systems requiring extended sleep mode. |
| Operating Temperature | –40°C to 150°C junction - qualified for under-hood automotive and high-temp industrial applications. |
| Switching Frequency | 500kHz fixed - allows use of compact 10μH inductors and ceramic capacitors, minimizing board area and EMI. |
Pinout & Package
LT1936HMS8E#TRPBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9), which must be soldered to PCB ground for thermal performance (θJA = 40°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Bootstrap drive supply | Provides >VIN voltage to fully saturate internal bipolar NPN switch; requires external diode + capacitor (e.g., 0.22μF + 1N4148). |
| 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 switching current. |
| GND (4) | Power and signal ground | Reference for internal circuitry and feedback divider; tied to exposed pad (Pin 9) for thermal and electrical integrity. |
| SHDN (5) | Enable/soft-start control | Logic-high (>2.3V) enables operation; grounded disables device (<2μA IQ); RC network on this pin 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)). |
| VC (7) | Compensation node | Internal error amplifier output; connects to external RC network (or COMP pin) for loop stability tuning. |
| COMP (8) | Internal compensation enable | Tie to VC to activate internal 50kΩ/150pF network; otherwise connect to GND or leave floating. |
| Exposed Pad (9) | Thermal & electrical ground | Must be soldered to large PCB ground plane with multiple thermal vias; not electrically isolated. |
Key Features
| Feature | Design Value |
|---|---|
| Thermally enhanced MSOP-8 with exposed pad | Enables 150°C junction operation without heatsink in typical layouts; reduces thermal resistance by >50% vs standard MSOP. |
| Internal/external frequency compensation | Supports rapid design iteration: internal RC (50kΩ/150pF) minimizes BOM count; external network optimizes transient response for high-COUT or low-ESR ceramic designs. |
| 500kHz fixed switching frequency | Permits use of small, low-cost 10μH shielded inductors and 22μF ceramic output capacitors-reducing solution size by >40% vs 100kHz converters. |
| Cycle-by-cycle current limiting + frequency foldback | Prevents thermal runaway during output shorts: current limit holds at 1.9A while frequency drops to ~40kHz, reducing power dissipation during fault. |
| Soft-start via SHDN pin | Eliminates input surge current by ramping internal reference; avoids tripping upstream fuses or causing bus droop in multi-rail systems. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to stable 3.3V/5V for engine control unit (ECU) sensors and CAN transceivers under cold-crank (4.5V) and load-dump (36V) conditions. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, ripple-controlled power domain with short-circuit resilience and wide input tolerance. Use Value: Maintains 1.4A output at 3.3V from 4.5V–36V input per spec; 150°C rating survives under-hood ambient; <2μA shutdown preserves battery life during vehicle sleep mode. | Use Scenario: Powering PLC I/O modules and fieldbus interface ICs from noisy 24V industrial rails subject to surges, brownouts, and reverse polarity events. IC Role / Device Role / Timing Role: Robust front-end DC/DC stage delivering clean, regulated 5V to downstream logic and analog circuitry. Use Value: Withstands 36V transients per ABSOLUTE MAX ratings; cycle-by-cycle current limit prevents latch-up during motor driver fault currents; exposed pad ensures thermal stability in enclosed enclosures. |
| Unregulated Wall Adapter Interface | High-Temperature Embedded System |
Use Scenario: Converting low-cost, loosely regulated 9–24V wall adapters into tightly regulated 3.3V for IoT edge nodes and wireless sensor hubs. IC Role / Device Role / Timing Role: Efficient step-down converter enabling compact, fanless designs with minimal external components. Use Value: 500kHz operation allows 10μH inductor + 22μF ceramic output cap-achieving <20mVpp ripple and 90% efficiency at 1A; internal compensation cuts BOM count by two passive parts. | Use Scenario: Powering FPGA configuration circuits and real-time processors in oil & gas downhole tools or aerospace avionics where ambient exceeds 125°C. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator meeting extended temperature qualification requirements. Use Value: LT1936HMS8E#TRPBF is specified and tested over –40°C to 150°C junction; no derating required up to 125°C ambient with proper layout; exposed pad ensures predictable thermal performance in sealed housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 42V input, 1.2A output, 3mm × 4mm MSOP-10, integrated MOSFETs, 3.3MHz sync capability | Higher frequency enables smaller magnetics but lower current; requires external MOSFET drivers for >1.2A loads | Select when board space is constrained and 1.2A suffices; avoid if 1.4A continuous output or bipolar switch ruggedness is required. |
| LM5164QPWPRQ1 | 100V input, 1A output, SOIC-10, integrated FETs, spread-spectrum EMI reduction | Higher voltage rating suits 48V industrial buses; lower current and different pinout prevent drop-in replacement | Choose for 48V+ systems needing AEC-Q100 qualification; not suitable for LT1936HMS8E#TRPBF's 3.6V–36V/1.4A envelope. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, the LT1936HMS8E#TRPBF delivers higher output current (1.4A vs 1.2A/1A) with proven bipolar switch ruggedness in automotive transients, operates across identical 3.6V–36V input range, and maintains full specification at 150°C junction-making it optimal for thermally demanding, high-current 12V/24V regulation tasks.
Availability
LT1936HMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and unregulated wall adapter interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1936HMS8E#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 semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT1936HMS8E#TRPBF belongs to Linear's legacy high-voltage buck regulator product line, engineered specifically for reliable DC/DC conversion in harsh environments-emphasizing wide input range, high junction temperature operation, and intrinsic short-circuit resilience without external current sense.
FAQ
What is the maximum junction temperature specification for the LT1936HMS8E#TRPBF?
The LT1936HMS8E#TRPBF is rated for a maximum junction temperature of 150°C, with guaranteed operation over –40°C to 150°C. This H-grade qualification makes it suitable for under-hood automotive and high-ambient industrial applications where standard E- or I-grade parts would require derating or thermal margin compromises. The exposed pad must be properly soldered to a thermal plane to achieve this rating.
Does the LT1936HMS8E#TRPBF support adjustable output voltages below 3.3V?
Yes, the LT1936HMS8E#TRPBF supports output voltages down to 1.20V using an external resistor divider on the FB pin, referenced to its precise 1.200V ±15mV internal bandgap. For example, a 3.3V output uses R1 = 18.2kΩ and R2 = 10kΩ; a 1.8V output uses R1 = 5kΩ and R2 = 10kΩ. R2 should be ≤20kΩ to minimize bias current error, and both resistors should be 1% tolerance.
Can the LT1936HMS8E#TRPBF operate with only ceramic capacitors on input and output?
Yes, the LT1936HMS8E#TRPBF is fully compatible with ceramic-only designs: a minimum 4.7μF X7R/X5R ceramic capacitor on VIN and ≥22μF (for 3.3V) or ≥15μF (for 5V) on VOUT. Its current-mode architecture does not rely on output capacitor ESR for stability, unlike voltage-mode controllers-enabling low-ripple, compact solutions without electrolytics.
What is the purpose of the BOOST pin on the LT1936HMS8E#TRPBF, and how is it configured?
The BOOST pin on the LT1936HMS8E#TRPBF provides a gate-drive voltage higher than VIN to fully saturate its internal bipolar NPN switch, ensuring low VCE(SAT) (~410mV) and high efficiency. It is configured with an external diode (e.g., 1N4148) and capacitor (typically 0.22μF) connected between SW and BOOST. The BOOST voltage must exceed SW by ≥2.2V; for 3.3V outputs, the standard configuration ties BOOST to VOUT via the diode/capacitor.
How does the LT1936HMS8E#TRPBF handle short-circuit conditions?
The LT1936HMS8E#TRPBF protects against shorted outputs using three coordinated mechanisms: (1) cycle-by-cycle current limiting clamps switch current at ≥1.9A, (2) frequency foldback reduces switching frequency from 500kHz to ~40kHz during overload to limit power dissipation, and (3) thermal shutdown activates at 150°C junction. These features allow indefinite short-circuit survival without damage when properly heatsunk.
LT1936HMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (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:
- 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#TRPBF FAQ
1.How can I place an order for LT1936HMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1936HMS8E#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 LT1936HMS8E#TRPBF reliable?
The price and inventory of LT1936HMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1936HMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1936HMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1936HMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1936HMS8E#TRPBF?
LT1936HMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1936HMS8E#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 LT1936HMS8E#TRPBF?
For technical support, including LT1936HMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1936HMS8E#TRPBF requirements.
6.How does Aetrix verify that LT1936HMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1936HMS8E#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 LT1936HMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1936HMS8E#TRPBF?
All LT1936HMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1936HMS8E#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 LT1936HMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT1936HMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1936HMS8E#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
