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Analog Devices Inc. LT1935ES5#TRPBF
- Part No.:
- LT1935ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1935ES5#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,176
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Product details
Overview
LT1935ES5#TRPBF from Analog Devices (formerly Linear Technology) is a 1.2MHz, 2A internal NPN switch boost DC/DC converter in TSOT-23-5 package, delivering up to 38V output from 2.3V–16V input, with 180mV VCE(SAT) at 2A and 1.265V feedback reference - used in compact LCD bias and xDSL power supplies.
For engineers reviewing the LT1935ES5#TRPBF datasheet, LT1935ES5#TRPBF pinout, LT1935ES5#TRPBF application, or LT1935ES5#TRPBF equivalent, key selection criteria include switching frequency stability across temperature, soft-start control via SHDN pin, high-voltage switch rating (40V), and compatibility with low-profile ceramic output capacitors for millivolt-level noise suppression.
Technical Context
The LT1935ES5#TRPBF employs a constant-frequency, current-mode PWM architecture with internal compensation, enabling predictable output ripple and straightforward EMI filtering. Its NPN switch achieves 180mV saturation voltage at 2A independent of input voltage, supporting high efficiency even at 3V input.
Feedback regulation uses a precise 1.265V reference with ±1.3% tolerance over –40°C to 85°C; undervoltage lockout activates below 2.1V, and shutdown current remains under 1µA. The device supports SEPIC and flyback topologies due to its 40V-rated switch and 93% max duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz - enables use of sub-2mm height inductors and reduces filter component size. |
| Max Output Voltage | 38 V - supports TFT-LCD bias rails and industrial auxiliary supplies without external HV components. |
| Input Voltage Range | 2.3 V to 16 V - accommodates single Li-ion, multi-cell alkaline, and 5V/12V system rails. |
| Switch Current Limit | 2 A typical, 3.2 A max - defines peak inductor current handling and transient load capability. |
| VCE(SAT) @ 2A | 180 mV - minimizes conduction loss, sustaining >75% efficiency at 5V→12V/600mA from 5V input. |
| Feedback Reference | 1.265 V ±1.3% - sets output accuracy via external resistor divider; enables precise 5V, 12V, or custom rail generation. |
| Shutdown Current | <1 µA - preserves battery life in always-on backup and portable systems during standby. |
Pinout & Package
LT1935ES5#TRPBF is housed in a 5-lead TSOT-23 (ThinSOT™) package: 1.90 mm × 2.80 mm × 0.95 mm profile, 1 mm max height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Collector Node | Connects to inductor and Schottky diode anode; requires minimal trace area to limit EMI radiation. |
| GND (Pin 2) | Power Ground Reference | Must tie directly to local ground plane; large copper area lowers thermal resistance and improves stability. |
| FB (Pin 3) | Feedback Input | Senses output via resistive divider; 1.265 V reference determines VOUT = 1.265 V × (1 + R1/R2). |
| SHDN (Pin 4) | Enable/Soft-Start Control | Logic-high ≥1.8 V enables operation; RC ramp here controls inrush current and eliminates output overshoot. |
| VIN (Pin 5) | Input Supply | Requires local 4.7 µF X5R/X7R ceramic bypass; low-impedance path essential for stable high-frequency switching. |
Key Features
| Feature | Design Value |
|---|---|
| 2A Integrated NPN Switch | Eliminates external transistor and driver, reducing BOM count and PCB area in space-constrained designs. |
| 1.265V Precision Feedback Reference | Enables ±1.5% output voltage accuracy across temperature without trimming or calibration. |
| Soft-Start via SHDN Pin | External RC network limits peak input current to ~1A during startup, avoiding supply sag or brownout. |
| 40V Switch Rating | Supports 38V boost, SEPIC, and flyback configurations - extends usable topology range beyond standard 34V converters. |
| Low 180mV VCE(SAT) | Reduces conduction loss by >40% vs. comparable 300mV switches, improving full-load efficiency at 3.3V input. |
Applications
| TFT-LCD Bias Supply | xDSL Line Power |
|---|---|
Use Scenario: Generating +8V, –8V, and +16V rails for active matrix LCD panels in handheld instruments and medical displays. IC Role / Device Role / Timing Role: Primary boost/SEPIC controller managing three regulated outputs using shared inductor and dual-diode configuration. Use Value: Single LT1935ES5#TRPBF replaces discrete transistor+controller solutions, cutting board area by 35% while maintaining <100mV output ripple. |
Use Scenario: Providing isolated 12V/320mA power for DSLAM line cards operating from 3.3V backplane rails. IC Role / Device Role / Timing Role: High-efficiency step-up regulator with fast transient response to handle burst-mode ADSL signal loading. Use Value: 1.2MHz switching enables compact 4.2µH inductor and 22µF ceramic output cap, meeting ETSI Class B conducted emissions without shielding. |
| Digital Camera Flash Charging | PC Card Local 5V Supply |
Use Scenario: Charging high-voltage capacitor banks (up to 300V) for xenon flash modules from single-cell lithium batteries. IC Role / Device Role / Timing Role: Primary boost stage feeding charge pump or transformer-driven HV generator; operates in discontinuous mode. Use Value: 40V switch rating and 93% max duty cycle allow direct 3.3V→30V pre-charge without cascaded stages, reducing start-up time by 22%. |
Use Scenario: Delivering regulated 5V at 1A from 3.3V host bus for PCMCIA/CardBus peripherals in industrial laptops. IC Role / Device Role / Timing Role: Standalone boost converter with integrated soft-start and UVLO, interfacing directly to hot-swap controllers. Use Value: Pin-compatible replacement for LT1613/LT1930 allows drop-in upgrade to 2A capability, supporting higher-power modems and Wi-Fi radios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1930ES5#TRPBF | 1A switch current limit, same 5-lead TSOT-23 package and pinout. | Lower output current capability limits use to ≤500mA loads; unsuitable for 12V/600mA xDSL supplies. | Select when 1A peak load suffices and cost sensitivity outweighs headroom needs. |
| LT3467ES5#TRPBF | 1.1A switch, 40V rating, but 1.3MHz switching and different FB reference (1.22V). | Higher frequency eases EMI filtering but demands tighter layout; 1.22V reference alters resistor divider values. | Prefer for new designs needing lower noise floor; not drop-in due to reference and timing differences. |
Compared with LT1935ES5#TRPBF, LT1930ES5#TRPBF offers identical footprint and interface but halves switch current capacity, while LT3467ES5#TRPBF trades current headroom for higher frequency and altered feedback precision - requiring redesign of compensation and output divider.
Availability
LT1935ES5#TRPBF is available at Aetrix Electronics and suitable for TFT-LCD bias, xDSL line power, and digital camera flash charging applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LT1935ES5#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 high-performance analog and power management portfolio with rigorous process control and automotive-grade qualification paths.
The LT1935ES5#TRPBF belongs to Linear's high-power ThinSOT™ DC/DC converter family, engineered for space-constrained applications demanding >1A output in sub-3mm² footprints - especially portable instrumentation, telecom line cards, and display subsystems.
FAQ
What is the maximum recommended output voltage for LT1935ES5#TRPBF?
The LT1935ES5#TRPBF supports up to 38V output in boost configuration, limited by its 40V-rated internal NPN switch and 93% maximum duty cycle. This rating is validated per Absolute Maximum Ratings and confirmed in Typical Applications circuits - including 12V/600mA and 30V/200mA designs - with no derating required below 38V under standard ambient conditions.
Does LT1935ES5#TRPBF require an external compensation network?
No, the LT1935ES5#TRPBF features internally compensated current-mode control, eliminating the need for external compensation components. Its constant-frequency PWM architecture stabilizes the control loop across input voltage and load variations without adding capacitors or resistors to the FB node - simplifying design and reducing bill-of-materials cost.
Can LT1935ES5#TRPBF be used in SEPIC topology?
Yes, the LT1935ES5#TRPBF is explicitly qualified for SEPIC operation per its 40V switch rating and high-duty-cycle capability. Application Note 1935 TA04 demonstrates a 5V SEPIC converter delivering 550mA from 4V input, confirming stable regulation and transient response - making LT1935ES5#TRPBF suitable for non-inverting buck-boost where input may exceed output.
What is the guaranteed operating temperature range for LT1935ES5#TRPBF?
The LT1935ES5#TRPBF is guaranteed to meet all electrical specifications over 0°C to 70°C (commercial grade). Performance over –40°C to 85°C is assured by design, characterization, and statistical process control - matching the extended range stated in the Absolute Maximum Ratings table and validated in Typical Performance Characteristics graphs.
How does the SHDN pin on LT1935ES5#TRPBF implement soft-start?
The SHDN pin on LT1935ES5#TRPBF provides soft-start by clamping the error amplifier output during ramp-up: applying an RC-filtered voltage to SHDN linearly increases the peak switch current limit from zero to full scale, limiting inrush current to ~1A versus ~3A without soft-start - verified in Figure 1935 F06a/b waveforms and documented in Applications Information section.
LT1935ES5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.265V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1935ES5#TRPBF FAQ
1.How can I place an order for LT1935ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1935ES5#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 LT1935ES5#TRPBF reliable?
The price and inventory of LT1935ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1935ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1935ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1935ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1935ES5#TRPBF?
LT1935ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1935ES5#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 LT1935ES5#TRPBF?
For technical support, including LT1935ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1935ES5#TRPBF requirements.
6.How does Aetrix verify that LT1935ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1935ES5#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 LT1935ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1935ES5#TRPBF?
All LT1935ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1935ES5#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 LT1935ES5#TRPBF part is unused and in its original packaging.
Return procedure for LT1935ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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