My Inquiry
My Account
Analog Devices Inc. LT1933ES6#TRPBF
- Part No.:
- LT1933ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT1933ES6#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:13,047
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1933ES6#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz, current-mode PWM step-down DC/DC converter with an integrated 0.75A bipolar NPN power switch in a 6-lead TSOT-23 package. It operates from 3.6V to 36V input, delivers up to 600mA at 3.3V or 5V output, and features internal compensation, soft-start, and <2μA shutdown current - enabling compact, efficient power regulation in space-constrained industrial and automotive systems.
For engineers reviewing the LT1933ES6#TRPBF datasheet, LT1933ES6#TRPBF pinout, LT1933ES6#TRPBF application, or LT1933ES6#TRPBF equivalent, key selection considerations include its fixed 500kHz switching frequency, 1.245V feedback reference, BOOST pin drive architecture for high-side switch saturation, –40°C to 85°C operating range, and compatibility with ceramic input/output capacitors and low-DCR inductors in minimal-footprint designs.
Technical Context
The LT1933ES6#TRPBF implements constant-frequency current-mode control using an internal RS flip-flop oscillator and slope-compensated current sensing. Its VC node serves as the error amplifier output and current limit clamp point, with active soft-start implemented via SHDN pin voltage ramping.
Operation relies on external BOOST capacitor–diode network to generate >VIN gate drive for the internal bipolar switch; minimum BOOST-to-SW voltage must exceed 1.9V for full saturation. Frequency foldback activates below ~55kHz when FB voltage drops, improving overload robustness during startup or short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports unregulated wall adapters, 24V industrial rails, and automotive battery inputs with transient tolerance up to 36V. |
| Switching Frequency | 500kHz (typical), 400–600kHz (min–max) - enables use of small 22–33μH inductors and 2.2–22μF ceramic capacitors without EMI filtering penalties. |
| Output Current | 600mA continuous - achievable at 3.3V (12–36V input) or 5V (16–36V input); limited by thermal resistance (θJA = 165°C/W) and internal 0.75A switch current limit. |
| Feedback Reference | 1.245V (±20mV over temp) - sets output voltage via resistor divider (VOUT = 1.245V × (1 + R1/R2)); enables adjustable outputs down to 1.25V. |
| Shutdown Current | <2μA - provides true output disconnect for battery-powered systems; SHDN pin threshold is 2.3V (high) / 0.3V (low). |
| Package & Temp Range | S6 (TSOT-23, 6-lead, 1mm height) with –40°C to +85°C operation - RoHS-compliant, lead-free, tape-and-reel packaged for automated assembly. |
Pinout & Package
LT1933ES6#TRPBF uses the S6 package: 6-lead Plastic TSOT-23, 1mm profile, exposed pad not present (unlike DFN variants). Pin 1 is BOOST, Pin 2 is GND, Pin 3 is FB, Pin 4 is SHDN, Pin 5 is VIN, Pin 6 is SW - arranged in standard TSOT-23 top-view order with no exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Charge pump drive node | Supplies elevated gate drive to internal bipolar switch; requires external 0.1μF capacitor + fast diode (e.g., 1N4148) tied to SW; must be ≥1.9V above SW for full saturation. |
| GND (Pin 2) | Power and signal reference | Primary ground return for internal regulator, error amp, and current sense; connects to local PCB ground plane under IC body. |
| FB (Pin 3) | Output voltage sense input | Regulated to 1.245V; connects to resistor divider midpoint; bias current ≤120nA ensures accuracy with R2 ≤10kΩ. |
| SHDN (Pin 4) | Enable/soft-start control | Logic-high (≥2.3V) enables operation; grounded disables output and reduces quiescent current to <2μA; RC ramp here implements controlled start-up. |
| VIN (Pin 5) | Main power input | Supplies internal LDO and switch driver; must be bypassed with ≥2.2μF X7R/X5R ceramic placed adjacent to pin. |
| SW (Pin 6) | Switch node | Drives external inductor and catch diode; carries pulsed current up to 0.75A; voltage swing ranges from ~0.4V (saturation) to VIN + VOUT (boost phase). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation components; stable with ceramic output capacitors (no ESR dependency), simplifying layout and reducing BOM count. |
| Cycle-by-cycle current limiting | Protects against shorted outputs using real-time inductor current monitoring; clamps at 0.75A typical, with slope compensation preventing subharmonic oscillation above 50% duty cycle. |
| Soft-start via SHDN pin | Enables controlled output voltage ramp-up by applying RC-filtered voltage to SHDN; prevents input surge and output overshoot during power-on. |
| Wide input range with UVLO | Undervoltage lockout triggers at ~3.35V, preventing erratic operation during brownout; allows direct use with 24V industrial supplies and automotive batteries (9–16V nominal). |
| Low-profile TSOT-23 packaging | 6-lead, 1mm height, footprint compatible with standard SOT-23 pick-and-place equipment; thermal performance optimized for ambient-limited applications without heatsinking. |
Applications
| Automotive Battery Regulation | Industrial Control Supply |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V/5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled DC supply with load dump and cold-crank tolerance. Use Value: Maintains regulation down to 3.6V input, survives transients up to 36V, and draws <2μA in shutdown - extending battery life during vehicle sleep mode. |
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus controllers from 24V DC industrial rails. IC Role / Device Role / Timing Role: Compact, thermally robust point-of-load regulator delivering stable 5V/600mA to noise-sensitive analog front-ends and digital logic. Use Value: 500kHz operation minimizes filter size; internal compensation eliminates tuning effort; wide input range accommodates rail fluctuations common in factory environments. |
| Wall Transformer Regulation | Battery-Powered Equipment |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter outputs to clean 3.3V for embedded Wi-Fi modules and USB peripherals. IC Role / Device Role / Timing Role: Efficient step-down regulator replacing linear regulators to reduce heat and improve efficiency in enclosed enclosures. Use Value: Achieves >85% efficiency at 500mA (12V→5V), uses only 2.2μF input and 22μF output ceramics, and fits within tight board area constraints. |
Use Scenario: Power management in portable test instruments, handheld meters, and medical monitors running from Li-ion or alkaline cells. IC Role / Device Role / Timing Role: Main system regulator enabling deep-sleep modes via ultra-low shutdown current and fast wake-up capability. Use Value: <2μA shutdown current preserves battery charge; soft-start prevents brownout during wake-up; adjustable output supports multiple rail requirements from single cell stack. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | 42V input, 2A switch, synchronous rectification, programmable charge termination - designed for battery charging, not general-purpose buck conversion. | Targeted at Li-ion/Pb-acid charging systems; lacks adjustable FB reference and BOOST pin architecture of LT1933ES6#TRPBF. | Select only if battery charging functionality is required; not drop-in for generic 3.3V/5V point-of-load use. |
| TPS54302DDCR | 28V input, 3A switch, integrated MOSFETs, 500kHz fixed frequency, 1.22V reference - uses CMOS FETs instead of bipolar, lower quiescent current (18μA), no BOOST pin. | Better light-load efficiency and smaller solution size; requires external compensation; incompatible pinout and control architecture. | Prefer for higher-current, lower-IQ designs where bipolar switch limitations (e.g., VCE(sat)) are unacceptable; not pin-compatible. |
Compared with LT3652IMSE#TRPBF and TPS54302DDCR, the LT1933ES6#TRPBF offers unique bipolar-switch architecture with BOOST-driven saturation, making it especially suitable for cost-sensitive, medium-current industrial supplies where predictable 0.75A current limit and simple external component count outweigh the need for synchronous efficiency or battery-specific features.
Availability
LT1933ES6#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial control supplies, and wall transformer regulation requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LT1933ES6#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 full technical and manufacturing continuity for legacy Linear power products.
The LT1933 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for rugged, wide-input industrial and automotive power conversion where simplicity, reliability, and thermal resilience are prioritized over ultra-low IQ or synchronous efficiency.
FAQ
What is the maximum continuous output current of the LT1933ES6#TRPBF?
The LT1933ES6#TRPBF delivers up to 600mA continuously at 3.3V output (12–36V input) or 5V output (16–36V input), limited by internal 0.75A switch current limit and thermal dissipation in the TSOT-23 package (θJA = 165°C/W). Derating is required above 70°C ambient; full 600mA is guaranteed at TA ≤ 85°C with adequate PCB copper.
Does the LT1933ES6#TRPBF require an external BOOST capacitor and diode?
Yes - the LT1933ES6#TRPBF requires an external BOOST capacitor (typically 0.1μF) and fast diode (e.g., 1N4148) connected between VIN and BOOST, and BOOST to SW. This network generates gate drive voltage >VIN to fully saturate the internal bipolar NPN switch; omission causes excessive conduction loss and thermal failure.
Can the LT1933ES6#TRPBF operate from a 5V input to produce 3.3V output?
Yes - the LT1933ES6#TRPBF supports 3.3V at 500mA from 4.5V to 36V input per datasheet specifications. At 5V input, minimum duty cycle (~13%) and BOOST circuit startup behavior must be verified; Figure 3b confirms reliable operation above 5.5V input for 5V output, but 5V input is feasible with proper soft-start and light load.
What is the purpose of the SHDN pin on the LT1933ES6#TRPBF beyond enable/disable control?
Beyond enable/disable, the SHDN pin on the LT1933ES6#TRPBF implements soft-start: applying a slow-rising voltage (via RC network) to SHDN ramps the internal error amplifier reference, controlling output voltage rise time and limiting inrush current. This prevents input surge and output overshoot during power-up - critical in systems with large output capacitance or sensitive downstream loads.
Is the LT1933ES6#TRPBF pin-compatible with other LT1933 variants like LT1933ES6#PBF or LT1933IS6#TRPBF?
Yes - all LT1933ES6#TRPBF, LT1933ES6#PBF, LT1933IS6#TRPBF, and LT1933IS6#PBF share identical S6 (TSOT-23) package pinout and footprint. Differences lie only in temperature grade (E = –40°C to 85°C, I = –40°C to 125°C) and packaging (TRPBF = lead-free tape-and-reel, PBF = lead-free bulk), not electrical or mechanical interface.
LT1933ES6#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 1.245V
- Voltage - Output (Max):
- 33.84V
- Current - Output:
- 600mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT1933ES6#TRPBF FAQ
1.How can I place an order for LT1933ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1933ES6#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 LT1933ES6#TRPBF reliable?
The price and inventory of LT1933ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1933ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1933ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1933ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1933ES6#TRPBF?
LT1933ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1933ES6#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 LT1933ES6#TRPBF?
For technical support, including LT1933ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1933ES6#TRPBF requirements.
6.How does Aetrix verify that LT1933ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1933ES6#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 LT1933ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1933ES6#TRPBF?
All LT1933ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1933ES6#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 LT1933ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT1933ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1933ES6#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…
