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Analog Devices Inc. LT1936IMS8E#TRPBF
- Part No.:
- LT1936IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT1936IMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.4A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
LT1936IMS8E#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 output in thermally enhanced 8-lead MSOP package. Designed for automotive battery regulation and industrial control supplies, it features cycle-by-cycle current limiting, thermal shutdown, and <2μA shutdown current.
For engineers reviewing the LT1936IMS8E#TRPBF datasheet, LT1936IMS8E#TRPBF pinout, LT1936IMS8E#TRPBF application, or LT1936IMS8E#TRPBF equivalent, key selection criteria include guaranteed 1.9A switch current, 1.200V ±15mV feedback reference, internal/external compensation flexibility, short-circuit protection across full input range, and –40°C to 125°C operating temperature grade.
Technical Context
The LT1936IMS8E#TRPBF implements constant-frequency current-mode control using an RS flip-flop driven by a 500kHz oscillator. Its error amplifier (250μS transconductance, 150V/V gain) servo-controls the VC pin to regulate output voltage via external resistor divider on FB pin referenced to 1.200V.
Protection architecture includes undervoltage lockout (~3.45V), frequency foldback during overload, active VC clamp for current limit, and thermal shutdown. The BOOST pin enables efficient drive of the internal bipolar switch by generating >VIN voltage via external diode-capacitor network, requiring ≥2.2V above SW for optimal saturation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports direct connection to automotive batteries (12V/24V), unregulated wall adapters, and industrial 24V rails without pre-regulation. |
| Output Current | 1.4A at 3.3V (7V–36V input) or 5V (10V–36V input) - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Switch Current Limit | 1.9A minimum - ensures robust short-circuit tolerance and stable operation under transient load surges. |
| Feedback Reference | 1.200V ±15mV - enables precise output voltage setting (e.g., 3.3V = 1.2V × (1 + R1/R2)) with minimal drift over temperature. |
| Switching Frequency | 500kHz fixed - allows use of compact 6.8–15μH inductors and ceramic output capacitors while maintaining predictable EMI profile. |
| Shutdown Current | <2μA - enables ultra-low-power state in battery-powered applications without compromising wake-up responsiveness. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial control environments where ambient extremes occur. |
Pinout & Package
LT1936IMS8E#TRPBF is housed in an 8-lead plastic MSOP package with exposed pad (Pin 9), 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 |
|---|---|---|
| BOOST (1) | Bootstrap drive voltage supply | Provides >VIN gate drive to internal bipolar NPN switch; requires external diode + capacitor; must exceed SW by ≥2.2V for full saturation. |
| VIN (2) | Main power input | Supplies internal regulator and power switch; requires local 4.7μF ceramic bypass; absolute max 36V. |
| 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 FB divider, thermal path for exposed pad; must tie to low-impedance ground plane with thermal vias. |
| SHDN (5) | Enable/soft-start control | Logic-high (>2.3V) enables operation; grounded disables converter; RC ramp here implements controlled start-up. |
| FB (6) | Feedback input | Regulated to 1.200V; connects to resistor divider from VOUT; bias current ≤300nA (H-grade) affects high-R divider accuracy. |
| VC (7) | Compensation node | Internal error amp output; connects to external RC network or ties to COMP for internal compensation (50kΩ + 150pF). |
| COMP (8) | Internal compensation enable | Tie to VC to activate internal 50kΩ/150pF network; otherwise leave floating or ground to disable. |
| Exposed Pad (9) | Thermal & electrical ground | Must be soldered to PCB ground plane; critical for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range support | 3.6V–36V operation eliminates need for upstream pre-regulators in automotive and industrial 24V systems. |
| Short-circuit protection | Guaranteed over full 3.6V–36V input range - prevents damage during output faults without external circuitry. |
| Thermally enhanced package | MS8E with exposed pad achieves θJC = 10°C/W - sustains 1.4A continuous output at 125°C ambient with proper PCB layout. |
| Flexible compensation | Supports internal (COMP-to-VC) or external (RC-to-ground) loop tuning - balances BOM count vs. transient response optimization. |
| Low quiescent current | 2.5mA typical operating current and <2μA shutdown - extends battery life in portable and always-on monitoring devices. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Powering infotainment head units, ADAS camera modules, or body control modules directly from 12V vehicle battery with cold-crank (6V) and load-dump (40V transient) resilience. IC Role / Device Role / Timing Role: Primary buck regulator converting raw battery voltage to stable 3.3V/5V rail for MCU, CAN transceivers, and image sensors. Use Value: Eliminates need for discrete protection circuitry due to 36V absolute max VIN rating and built-in short-circuit/foldback protection. | Use Scenario: Providing isolated 5V/3.3V power for PLC I/O modules, motor drive logic, or fieldbus interface cards in factory automation cabinets. IC Role / Device Role / Timing Role: Point-of-load DC/DC converter delivering regulated output from 24V industrial bus with high efficiency across 10%–100% load range. Use Value: 500kHz switching enables small magnetics and ceramic caps, reducing board area and improving reliability versus lower-frequency alternatives. |
| Unregulated Wall Adapter Interface | Portable Medical Device Power |
Use Scenario: Regulating noisy, loosely regulated 9–24V AC/DC wall adapters into clean 3.3V for IoT gateways, smart meters, or wireless sensor nodes. IC Role / Device Role / Timing Role: Input-stage buck converter absorbing ripple and line transients before feeding downstream LDOs or PMICs. Use Value: Internal compensation option minimizes external parts count; <2μA shutdown current preserves battery backup during AC loss. | Use Scenario: Powering handheld ultrasound probes, glucose monitors, or wearable ECG sensors requiring long battery runtime and low-noise analog rails. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supplying 3.3V to ARM Cortex-M microcontroller and precision ADCs from single-cell Li-ion (3.0–4.2V) or two-cell alkaline. Use Value: 3.6V min VIN supports operation down to near-empty battery; soft-start via SHDN pin prevents inrush-induced brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMS8E#TRPBF | Higher 3MHz switching frequency; 1.2A output; integrated MOSFETs; requires external compensation only. | Better suited for ultra-compact designs needing <1mm height; less suitable for high-current 1.4A loads at 36V input. | Select LTC3630EMS8E#TRPBF when board space is constrained and load current ≤1.2A; retain LT1936IMS8E#TRPBF for higher current or wider input range. |
| TPS54332DR | 3.5V–28V input; 3A output; integrated MOSFETs; 1MHz switching; external compensation required. | Higher output current but narrower input range; lacks guaranteed short-circuit protection across full VIN range. | Choose TPS54332DR for cost-sensitive industrial applications needing >1.4A; use LT1936IMS8E#TRPBF where 36V input or robust fault protection is mandatory. |
Compared with LTC3630EMS8E#TRPBF and TPS54332DR, LT1936IMS8E#TRPBF uniquely combines 36V input capability, 1.9A switch current guarantee, and short-circuit protection across its entire input range - making it preferred for automotive and harsh-environment industrial use cases where input transients and fault resilience are critical.
Availability
LT1936IMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and unregulated wall adapter interfaces requiring stable component supply, extended temperature operation, and proven field reliability.
Supply support for LT1936IMS8E#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 aerospace, automotive, industrial, and communications markets.
The LT1936IMS8E#TRPBF belongs to Linear's legacy high-voltage monolithic buck regulator product line, designed specifically for robust, wide-input-range DC/DC conversion in automotive and industrial environments where reliability under voltage transients and thermal stress is essential.
FAQ
What is the guaranteed minimum switch current for LT1936IMS8E#TRPBF?
The LT1936IMS8E#TRPBF guarantees a minimum switch current of 1.9A across its operating temperature range (–40°C to 125°C). This value is confirmed in the Electrical Characteristics table under "Switch Current Limit" and is validated by design correlation per Note 3 in the datasheet. The actual current limit increases to 2.2A typical and 2.6A maximum, but 1.9A is the guaranteed minimum for worst-case conditions including high temperature and process variation. This rating ensures reliable operation under short-circuit events and heavy transient loads without device failure.
Can LT1936IMS8E#TRPBF operate from a 5V input to generate 3.3V at 1.2A?
Yes, LT1936IMS8E#TRPBF can deliver 3.3V at 1.2A from a 4.5V–36V input, as explicitly stated in the Applications section: "3.3V at 1.2A from 4.5V to 36V Input." At 5V input, the duty cycle is ~70%, well within the 87% maximum specified. Efficiency remains >85% (per Figure 1936 G05), and thermal performance is maintained using the MS8E package's exposed pad. Ensure the inductor (e.g., 10μH) and catch diode (e.g., DFLS140L) meet recommendations in the Applications Information section to sustain continuous 1.2A output.
What is the function of the COMP pin on LT1936IMS8E#TRPBF?
The COMP pin on LT1936IMS8E#TRPBF enables selection between internal and external frequency compensation. When tied to the VC pin, it activates the internal 50kΩ resistor and 150pF capacitor network, eliminating external components. If left floating or grounded, external RC compensation is used. This dual-mode design allows designers to trade off BOM simplicity (internal) against optimized transient response (external), especially important when using high-value output capacitors. The COMP pin itself draws negligible current and has no active circuitry - its sole purpose is to connect or isolate the internal RC network from the VC node.
Does LT1936IMS8E#TRPBF require a boost capacitor, and what value is recommended?
Yes, LT1936IMS8E#TRPBF requires an external boost capacitor on the BOOST pin to drive its internal bipolar NPN switch efficiently. A 0.22μF ceramic capacitor is recommended for most applications (e.g., 3.3V or 5V outputs), paired with a fast-switching diode like 1N4148. For 2.5V outputs or low-temperature operation, a 1μF capacitor with a low-drop Schottky diode (e.g., MBR0540) is advised to ensure sufficient BOOST voltage margin. The capacitor must be placed close to the BOOST and SW pins to minimize parasitic inductance, and its voltage rating must exceed the sum of VIN and VOUT to avoid overstress during startup.
What is the feedback reference voltage accuracy of LT1936IMS8E#TRPBF over temperature?
The feedback reference voltage of LT1936IMS8E#TRPBF is 1.200V with a guaranteed tolerance of ±15mV (1.185V to 1.215V) over the full –40°C to 125°C operating temperature range, as specified in the Electrical Characteristics table under "FB Voltage" with ● marking. This tight tolerance is maintained across all grades (E/I/H) and ensures accurate output voltage regulation without trimming. Typical variation across temperature is ±5mV (per Figure 1936 G07), confirming stability for precision applications such as sensor power supplies and ADC references where output accuracy directly impacts measurement fidelity.
LT1936IMS8E#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT1936IMS8E#TRPBF FAQ
1.How can I place an order for LT1936IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1936IMS8E#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 LT1936IMS8E#TRPBF reliable?
The price and inventory of LT1936IMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1936IMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1936IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1936IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1936IMS8E#TRPBF?
LT1936IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1936IMS8E#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 LT1936IMS8E#TRPBF?
For technical support, including LT1936IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1936IMS8E#TRPBF requirements.
6.How does Aetrix verify that LT1936IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1936IMS8E#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 LT1936IMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1936IMS8E#TRPBF?
All LT1936IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1936IMS8E#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 LT1936IMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT1936IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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