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Analog Devices Inc. LT1936EMS8E#TRPBF
- Part No.:
- LT1936EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1936EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.4A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
LT1936EMS8E#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. It accepts 3.6V–36V input and delivers up to 1.4A at 3.3V or 5V in thermally enhanced 8-lead MSOP package. Designed for automotive battery regulation, industrial control supplies, and unregulated wall adapters.
For engineers reviewing the LT1936EMS8E#TRPBF datasheet, LT1936EMS8E#TRPBF pinout, LT1936EMS8E#TRPBF application, or LT1936EMS8E#TRPBF equivalent, key selection considerations include guaranteed 1.9A switch current, internal/external compensation flexibility, <2μA shutdown current, ±15mV FB voltage accuracy over temperature, and thermal shutdown with exposed-pad GND connection.
Technical Context
The LT1936EMS8E#TRPBF implements constant-frequency current-mode control using an RS flip-flop oscillator and slope-compensated current sensing. Its error amplifier (250μS transconductance) servos the VC pin to regulate output via external feedback divider, while cycle-by-cycle current limiting and frequency foldback protect against overload and short-circuit conditions.
It features dual compensation options: internal RC network (50kΩ + 150pF) accessible via COMP-to-VC tie, or external RC network on VC pin. The BOOST pin drives the bipolar switch with voltage ≥2.2V above SW, enabled by external diode-capacitor charge pump, supporting efficient operation across full input range.
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. |
| Switch Current Limit | 1.9A min - guarantees continuous 1.4A output at 3.3V/5V with margin for transient loads and thermal derating. |
| Switching Frequency | 500kHz fixed - enables use of small 6.8–15μH inductors and ceramic output capacitors (e.g., 22μF X7R) for compact, low-ripple designs. |
| Feedback Voltage | 1.200V ±15mV - sets precise output voltage via resistor divider; enables adjustable outputs down to 1.20V with <0.01%/V line regulation. |
| Shutdown Current | <2μA - allows battery-powered systems to achieve ultra-low standby power without external load switches. |
| Operating Temperature | –40°C to +85°C - E-grade rating qualified for under-hood automotive and industrial environments with no derating required. |
| Package Thermal Resistance | θJA = 40°C/W, θJC = 10°C/W - exposed pad must be soldered to PCB ground plane with thermal vias for reliable 1.4A operation at full ambient range. |
Pinout & Package
LT1936EMS8E#TRPBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9, GND). The package is thermally enhanced for high-power density step-down conversion in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | Bootstrap drive voltage supply | Provides >VIN voltage to fully saturate 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 bypassed locally with ≥4.7μF X7R ceramic capacitor. |
| SW (3) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; carries high di/dt switching current - requires tight layout. |
| GND (4) | Power and signal reference | Return path for internal circuits and feedback divider; exposed pad (Pin 9) is electrically connected GND and must be soldered. |
| SHDN (5) | Enable/soft-start control | Logic-high (>2.3V) enables operation; grounded disables IC with <2μA quiescent current; RC ramp enables controlled soft-start. |
| FB (6) | Feedback input | Servo point regulated to 1.200V; connects to resistor divider tap - R2 = 10kΩ recommended for minimal bias error. |
| VC (7) | Compensation node | Output of error amplifier; connects to external RC network (or internal network via COMP tie) to stabilize control loop. |
| COMP (8) | Internal compensation access | Tie to VC to enable internal 50kΩ/150pF network; otherwise connect to GND or leave floating for external compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3.6V–36V) | Enables single-bom solution across 12V/24V automotive, industrial 24V, and universal wall adapter inputs without redesign. |
| 1.9A guaranteed switch current | Supports 1.4A continuous output at 3.3V/5V with headroom for cold-start surges and board-level thermal margins. |
| 500kHz fixed-frequency operation | Reduces inductor size and cost vs. lower-frequency buck converters; maintains predictable EMI profile for compliance testing. |
| Internal or external compensation | Internal RC (50kΩ/150pF) minimizes BOM count; external option allows optimization for high-COUT or low-ESR ceramic stability. |
| Thermally enhanced MSOP-8 with exposed pad | Delivers 1.4A output in 3mm × 3mm footprint with validated thermal performance when pad is soldered to 4+ thermal vias. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Powering infotainment head units, ADAS camera modules, and body control modules directly from 12V vehicle battery with load dump tolerance. IC Role / Device Role / Timing Role: Primary step-down regulator converting raw battery voltage (9V–16V nominal, up to 36V during load dump) to stable 3.3V/5V rail. Use Value: Eliminates need for pre-regulator stage; short-circuit protection and thermal shutdown ensure robustness during fault conditions. | Use Scenario: Providing isolated 5V logic supply for PLC I/O modules, motor drive controllers, and sensor interface boards in factory automation systems. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter accepting wide-range 24V industrial bus (18V–36V) and delivering clean, regulated 5V at 1.2A. Use Value: Enables compact, fanless enclosure design due to thermally optimized MSOP-8 package and <2μA shutdown current. |
| Unregulated Wall Adapter Interface | Point-of-Load Converter for Legacy Systems |
Use Scenario: Regulating noisy, unregulated 9V–24V wall adapters into stable 3.3V for embedded microcontrollers and communication peripherals. IC Role / Device Role / Timing Role: Input-stage buck converter rejecting ripple and line transients before downstream LDOs or digital ICs. Use Value: 500kHz switching and ceramic capacitor compatibility yield <20mVpp output ripple without bulky electrolytics. | Use Scenario: Replacing aging linear regulators on legacy industrial PCBs where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade replacing 7805-style TO-220 regulators with 85%+ efficiency at 1A load. Use Value: Reduces board temperature rise by >40°C vs. linear solution; same 8-pin footprint simplifies retrofit without layout change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3606EMSE#PBF | 4MHz synchronous buck, 2.5A, integrated MOSFETs, 2.7V–5.5V input - not compatible with 36V input. | Targeted at low-voltage portable systems; lacks automotive-grade temp range and high-VIN capability. | Select only if input is ≤5.5V and higher frequency/efficiency is prioritized over input range. |
| MP2451DT-LF-Z | 3.3V–36V input, 0.6A max, 2MHz, no internal compensation - lower current rating and no VC pin for loop tuning. | Suitable for sub-1A loads; lacks soft-start control and thermal shutdown flag. | Choose when cost and size are critical and load current remains below 0.6A with no transient surge requirement. |
Compared with LTC3606EMSE#PBF and MP2451DT-LF-Z, the LT1936EMS8E#TRPBF uniquely combines 36V input support, 1.9A switch current, internal/external compensation, and –40°C to +85°C operation - making it the only option among the three qualified for automotive battery-fed 3.3V/5V rails requiring robust short-circuit recovery.
Availability
LT1936EMS8E#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 and input voltage ranges.
Supply support for LT1936EMS8E#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 and maintains its precision analog and power management product lines with full datasheet, simulation model, and application support.
The LT1936 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input DC/DC conversion in automotive, industrial, and telecom infrastructure where reliability under voltage transients and thermal stress is critical.
FAQ
What is the maximum continuous output current supported by the LT1936EMS8E#TRPBF?
The LT1936EMS8E#TRPBF supports up to 1.4A continuous output current at 3.3V (from 7V–36V input) or 5V (from 10V–36V input), based on thermal limits of the MS8E package with properly soldered exposed pad and adequate PCB copper area. At 25°C ambient with 4 thermal vias, full 1.4A is achievable; derating applies above 60°C ambient.
Does the LT1936EMS8E#TRPBF require an external catch diode?
Yes, the LT1936EMS8E#TRPBF requires an external Schottky catch diode (e.g., DFLS140L or MBRM140) connected between SW and output. It uses a bipolar NPN internal switch, so synchronous rectification is not supported. Diode reverse voltage rating must exceed maximum input voltage (≥36V), and average current rating should be ≥1.1A.
Can the LT1936EMS8E#TRPBF operate with only ceramic capacitors on input and output?
Yes, the LT1936EMS8E#TRPBF is fully compatible with ceramic-only designs: ≥4.7μF X7R/X5R input capacitor and ≥22μF X7R output capacitor (for 3.3V) or ≥15μF (for 5V) are recommended. Its current-mode architecture does not rely on output capacitor ESR for stability, unlike many older buck controllers.
What is the purpose of the COMP pin on the LT1936EMS8E#TRPBF?
The COMP pin on the LT1936EMS8E#TRPBF provides access to the internal 50kΩ resistor and 150pF capacitor compensation network. Tying COMP to VC enables internal compensation, eliminating external components. If external compensation is used, COMP must be tied to GND or left floating - never driven.
How is soft-start implemented on the LT1936EMS8E#TRPBF?
Soft-start on the LT1936EMS8E#TRPBF is implemented by applying a controlled voltage ramp to the SHDN pin using an external resistor and capacitor. When SHDN rises from 0V to >2.3V, the IC enables gradually, limiting inrush current. A typical RC network (e.g., 100kΩ + 100nF) yields ~10ms ramp time and eliminates output overshoot during startup.
LT1936EMS8E#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT1936EMS8E#TRPBF FAQ
1.How can I place an order for LT1936EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1936EMS8E#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 LT1936EMS8E#TRPBF reliable?
The price and inventory of LT1936EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1936EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1936EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1936EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1936EMS8E#TRPBF?
LT1936EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1936EMS8E#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 LT1936EMS8E#TRPBF?
For technical support, including LT1936EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1936EMS8E#TRPBF requirements.
6.How does Aetrix verify that LT1936EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1936EMS8E#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 LT1936EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1936EMS8E#TRPBF?
All LT1936EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1936EMS8E#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 LT1936EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT1936EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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