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Analog Devices Inc. LT1935ES5#TRMPBF
- Part No.:
- LT1935ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1935ES5#TRMPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,473
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Product details
Overview
LT1935ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency current-mode boost DC/DC converter with an integrated 2A/40V NPN switch, 1.2MHz switching frequency, and 1.265V feedback reference. It delivers up to 38V output from inputs as low as 2.3V and supports 5V@1A from 3.3V input - ideal for space-constrained battery-powered bias supplies.
For engineers reviewing the LT1935ES5#TRMPBF datasheet, LT1935ES5#TRMPBF pinout, LT1935ES5#TRMPBF application, or LT1935ES5#TRMPBF equivalent, key selection criteria include its 180mV VCE(SAT) at 2A, <1µA shutdown current, 5-lead TSOT-23 package, and compatibility with ceramic output capacitors for millivolt-level noise suppression.
Technical Context
The LT1935ES5#TRMPBF employs a constant-frequency, internally compensated current-mode PWM architecture with a 1.265V precision reference and ramp-based slope compensation. Its NPN power switch achieves 180mV saturation voltage independent of input supply, enabling >85% efficiency at full 2A load even from 3V input.
It integrates soft-start via the SHDN pin, features undervoltage lockout at 2.3V (typ), and supports SEPIC and flyback topologies due to its 40V-rated switch. The 1.2MHz oscillator allows use of sub-2mm-height inductors and low-ESR ceramic capacitors without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz (enables compact 2mm-height magnetics and fast transient response) |
| Feedback Reference Voltage | 1.265 V (sets output via resistive divider: VOUT = 1.265 × (1 + R1/R2)) |
| Max Switch Current | 2 A (continuous, with 3.2A current limit threshold) |
| VCE(SAT) @ 2A | 180 mV (low conduction loss enables high efficiency at full load) |
| Input Voltage Range | 2.3 V to 16 V (supports single Li-ion, multi-cell alkaline, and 5V/12V rails) |
| Shutdown Current | <1 µA (preserves battery life in standby mode) |
| UVLO Threshold | 2.3 V (typ, prevents erratic operation during brownout) |
Pinout & Package
LT1935ES5#TRMPBF is housed in a 5-lead TSOT-23 (ThinSOT™) package - 2.9mm × 1.6mm × 1.0mm profile, JEDEC MO-193 compliant, with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Collector | Connects to inductor/diode node; high di/dt path requiring minimized trace area to reduce EMI |
| GND (Pin 2) | Power Ground | Primary return path for switch current; must tie directly to local ground plane for thermal and noise control |
| FB (Pin 3) | Feedback Input | Senses output via resistor divider; 1.265V reference sets regulation point; sensitive node requiring short, shielded routing |
| SHDN (Pin 4) | Enable/Soft-Start Control | Logic-high ≥1.8V enables operation; RC ramp here controls peak inrush current during startup |
| VIN (Pin 5) | Input Supply | Power input (2.3–16V); requires local 4.7µF X5R/X7R ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A/40V NPN Switch | Enables 38V boost and SEPIC/flyback topologies without external high-voltage transistor |
| 1.2MHz Constant-Frequency PWM | Permits use of miniature, low-profile inductors (e.g., Sumida CDRH5D28-4R2) and ceramic output caps |
| 180mV VCE(SAT) @ 2A | Reduces conduction loss by >40% vs. typical 300mV switches, sustaining >80% efficiency at 1A/12V output |
| Soft-Start via SHDN Pin | External RC network limits peak input current to ≤1A during startup, eliminating inrush-related rail droop |
| Low 1µA Shutdown Current | Extends battery runtime in always-on portable systems such as digital cameras and PC cards |
Applications
| Digital Camera LCD Bias | TFT-LCD TFT Gate Driver Supply |
|---|---|
Use Scenario: Generating 12V–18V bias for active-matrix LCD panels in compact digital cameras. IC Role / Device Role / Timing Role: Primary boost converter delivering regulated high-voltage rail from single 3.3V or dual 1.5V alkaline cells. Use Value: 1.2MHz operation enables sub-2mm-height inductors, meeting strict Z-height constraints while maintaining >85% efficiency at 320mA load. |
Use Scenario: Providing gate-on (VGH) and gate-off (VGL) voltages for TFT-LCD column drivers in industrial displays. IC Role / Device Role / Timing Role: Dual-rail SEPIC converter generating ±8V and +16V outputs from 3.2–9V input using single LT1935ES5#TRMPBF. Use Value: 40V switch rating and current-mode control ensure stable regulation across wide input range and load transients. |
| xDSL Line Card Local 5V/12V Supply | Battery Backup Power for Real-Time Clocks |
Use Scenario: Deriving isolated 5V and 12V auxiliary rails from 48V telecom line power in xDSL modems. IC Role / Device Role / Timing Role: High-input-voltage boost converter operating at 16V max VIN, driving flyback transformer primary. Use Value: 16V absolute max input rating and 1.265V precision FB reference enable accurate output setpoint under varying line conditions. |
Use Scenario: Maintaining RTC and SRAM backup during main power failure using coin-cell or supercapacitor input. IC Role / Device Role / Timing Role: Ultra-low-quiescent boost regulator stepping up 2.5V–3.3V backup source to 5V system rail. Use Value: <1µA shutdown current and 2.3V UVLO prevent premature cutoff, extending backup runtime beyond 72 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1930ES5#TRMPBF | 1A switch (vs. 2A), 34V max output (vs. 38V), same 5-lead TSOT-23 package | Lower output current capability limits use to ≤600mA loads; unsuitable for 1A/5V camera bias | Select when 1A output suffices and board space matches LT1935ES5#TRMPBF footprint |
| LT3467ES5#TRMPBF | 1.1A switch, 40V max output, 1.3MHz switching (vs. 1.2MHz), higher 1.2mA quiescent current | Higher voltage rating suits 40V applications; higher IQ reduces battery life in always-on devices | Prefer for 40V-output designs where 1.1A load current is adequate and layout accommodates same TSOT-23 footprint |
Compared with LT1935ES5#TRMPBF, LT1930ES5#TRMPBF offers identical pinout but halved current drive, while LT3467ES5#TRMPBF extends voltage capability at the cost of higher static power - making LT1935ES5#TRMPBF optimal for 2A, 38V, low-IQ space-constrained boost needs.
Availability
LT1935ES5#TRMPBF is available at Aetrix Electronics and suitable for digital camera LCD bias, TFT-LCD gate driver supplies, and xDSL line card auxiliary power requiring stable component supply, long-lifecycle assurance, and consistent parametric performance.
Supply support for LT1935ES5#TRMPBF 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 reliability testing.
The LT1935ES5#TRMPBF belongs to Linear's high-power SOT-23 DC/DC converter family, designed specifically for space-constrained portable and telecom applications demanding >2A output in minimal PCB area.
FAQ
What is the maximum output voltage achievable with the LT1935ES5#TRMPBF?
The LT1935ES5#TRMPBF supports up to 38V output voltage, enabled by its internal 40V-rated NPN switch and robust 1.265V feedback reference. This rating is validated across temperature and load conditions per the Absolute Maximum Ratings table, making it suitable for high-voltage boost, SEPIC, and flyback topologies where precise regulation above 30V is required.
Can the LT1935ES5#TRMPBF operate from a single alkaline cell?
No - the LT1935ES5#TRMPBF has a minimum input voltage of 2.3V, and a fresh alkaline cell starts at ~1.6V and drops rapidly under load. It is designed for two alkaline cells (starting ~3.2V), Li-ion (3.0–4.2V), or regulated 3.3V/5V rails. Using it below 2.3V risks UVLO activation and unregulated operation.
Is the LT1935ES5#TRMPBF pin-compatible with the LT1613?
Yes - the LT1935ES5#TRMPBF is explicitly documented as pin-for-pin compatible with the LT1613 and LT1930 in the official datasheet. All five pins (SW, GND, FB, SHDN, VIN) share identical functions, physical locations, and electrical tolerances, allowing direct replacement without PCB modification.
What type of output capacitor is recommended for the LT1935ES5#TRMPBF?
The LT1935ES5#TRMPBF is optimized for low-ESR ceramic capacitors - specifically X5R or X7R dielectrics rated ≥6.3V. A 10µF–22µF value is typical for 5V/12V outputs; larger values (e.g., 20µF) improve transient response. Tantalum or polymer capacitors may be used only if specified for switching regulator applications and derated for ripple current.
Does the LT1935ES5#TRMPBF require an external compensation network?
No - the LT1935ES5#TRMPBF features internal frequency compensation tailored for current-mode control. No external compensation components are needed for standard boost configurations. Stability is maintained across input/output ranges and load conditions without added RC networks or feedforward capacitors.
LT1935ES5#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT1935ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1935ES5#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT1935ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1935ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1935ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1935ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1935ES5#TRMPBF?
LT1935ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1935ES5#TRMPBF 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#TRMPBF?
For technical support, including LT1935ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1935ES5#TRMPBF requirements.
6.How does Aetrix verify that LT1935ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1935ES5#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1935ES5#TRMPBF?
All LT1935ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1935ES5#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT1935ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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