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Analog Devices Inc. LT1613CS5#TRPBF
- Part No.:
- LT1613CS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1613CS5#TRPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,781
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Product details
Overview
LT1613CS5#TRPBF from Analog Devices (formerly Linear Technology) is a 1.4MHz current-mode step-up DC/DC converter in a 5-lead SOT-23 package, designed for ultra-low-input-voltage battery-powered systems. It operates from as low as 1.1V input, delivers up to 34V output, supports 300mA switch current, and achieves 5V at 200mA from a 3.3V supply - ideal for compact portable power rails in digital cameras and medical diagnostics.
For engineers reviewing the LT1613CS5#TRPBF datasheet, LT1613CS5#TRPBF pinout, LT1613CS5#TRPBF application, or LT1613CS5#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed boost/SEPIC operating parameters, real-world efficiency curves across input voltages (1.5V–5V), and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The LT1613CS5#TRPBF implements a fixed-frequency (1.0–1.8MHz typ.) current-mode PWM architecture with internal compensation, enabling stable regulation without external loop components. Its 36V-rated high-side NPN switch (VCESAT = 300mV @ 300mA) supports boost, SEPIC, and flyback topologies with duty cycle up to 86%.
It features a precision 1.23V feedback reference (±2.5% over temp), shutdown current <1µA, and operates across –40°C to 85°C (extended commercial grade). The device integrates oscillator, error amplifier, ramp generator, and current-sense comparator - all optimized for minimal external component count in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4MHz typical - enables use of sub-3mm-height inductors and ceramic capacitors, reducing board area to <0.2 in². |
| Input Voltage Range | 1.1V to 10V - supports single-cell alkaline (1.5V), NiMH (1.2V), or Li-ion (2.7–4.2V) without pre-regulation. |
| Output Voltage Range | Up to 34V - achieved via external resistor divider; no internal voltage limit beyond 36V switch rating. |
| Switch Current Limit | 550–800mA - sets maximum deliverable load current in boost mode; determines inductor saturation margin. |
| Feedback Reference | 1.23V ±2.5% - defines output accuracy; VOUT = 1.23V × (1 + R1/R2); enables precise 5V, 12V, 15V, or negative rail generation. |
| Shutdown Current | <1µA at VIN = 2–5V - preserves battery life in standby; SHDN pin threshold is 1V high / 0.3V low. |
| Operating Temperature | –40°C to +85°C - qualified for extended commercial applications including portable medical and industrial sensors. |
Pinout & Package
LT1613CS5#TRPBF is housed in a 5-lead plastic SOT-23 package (JEDEC MO-178AA, EIAJ SC-74A), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch collector node | Connects to inductor/diode junction; carries high di/dt switching current - minimize trace area to reduce EMI. |
| GND (Pin 2) | Power and signal ground | Must tie directly to local ground plane; serves as return path for switch current and FB reference - single-point grounding critical. |
| FB (Pin 3) | Feedback input | Monitors divided output voltage; internal 1.23V reference - external R1/R2 set VOUT; sensitive to noise - keep trace short and away from SW. |
| SHDN (Pin 4) | Enable/disable control | Logic-level input: ≥1V enables regulator; ≤0.3V disables with <1µA quiescent draw - compatible with microcontroller GPIO. |
| VIN (Pin 5) | Input supply | Accepts 1.1–10V; requires local 15µF tantalum or low-ESR ceramic bypass within 5mm - prevents instability and startup failure. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation network - reduces BOM count and layout sensitivity while ensuring stability with ceramic or tantalum outputs. |
| Ultra-low minimum input voltage | 1.1V operation enables direct regulation from single alkaline/NiMH cells - avoids inefficient linear pre-regulators or charge pumps. |
| High-voltage 36V switch | Supports 34V boost outputs and SEPIC/flyback topologies - replaces discrete transistor+driver solutions in multi-rail bias supplies. |
| 1.4MHz fixed-frequency switching | Enables use of 2.2–22µH inductors ≤3mm height and 1–22µF ceramic/tantalum caps - cuts solution size vs. kHz-range converters. |
| Sub-1µA shutdown current | Extends battery runtime in intermittent-use devices like pagers and modems - SHDN pin draws only 25–50µA when active. |
Applications
| Digital Camera Power Supply | TFT LCD Bias Generation |
|---|---|
Use Scenario: Generating +5V/50mA, +12V/10mA, –7.5V/10mA from four alkaline cells in compact camera modules. IC Role / Device Role / Timing Role: Primary step-up/SEPIC controller managing three regulated rails simultaneously using single inductor pair and shared switch. Use Value: Replaces bulky transformer-based or multi-IC solutions - achieves full bias supply in <0.3 in² with all-ceramic capacitor support. |
Use Scenario: Providing +8V/70mA, –8V/5mA, +24V/5mA for TFT panel gate drivers and source drivers from 3.3V system rail. IC Role / Device Role / Timing Role: High-frequency boost controller driving charge-pump-like cascaded stages with fast transient response. Use Value: Delivers tight regulation across wide load range (5–70mA) with <50mV ripple - meets display pixel uniformity requirements. |
| Portable Medical Diagnostic Equipment | PC Card / ExpressCard Local Supply |
Use Scenario: Creating isolated 5V/175mA and 15V/30mA rails from 4-cell alkaline or Li-ion input in handheld ultrasound or glucose meters. IC Role / Device Role / Timing Role: Single-chip SEPIC regulator delivering both positive rails with inherent input-output isolation and wide VIN tolerance. Use Value: Maintains regulation during battery discharge (4×1.5V → 4×0.9V); achieves >75% efficiency at 3.6V input - extends clinical usage time. |
Use Scenario: Generating local 5V/200mA and 3.3V auxiliary rails from 3.3V host bus in PCMCIA/ExpressCard peripherals. IC Role / Device Role / Timing Role: Compact boost converter operating in forced PWM mode - immune to host bus voltage droop during hot-plug events. Use Value: Supports full-speed USB 2.0 or SDIO interface operation without brownout - 200mA output sustains burst data transfers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1615ES5#TRPBF | Higher max input (20V), lower IQ (20µA), but 600kHz switching - larger magnetics required. | Better suited for 2-cell Li-ion (up to 8.4V) inputs; less optimal for single-cell sub-1.5V start-up. | Select LT1615ES5#TRPBF when input exceeds 10V or ultra-low quiescent current is prioritized over size. |
| LT1307CS5#TRPBF | 600kHz fixed frequency, 3.3V/75mA output from 1V - lower output capability and no SEPIC support. | Limited to low-power logic rails; cannot generate >5V or negative outputs without additional circuitry. | Choose LT1307CS5#TRPBF only for simple 3.3V point-of-load where 75mA suffices and board area is secondary. |
Compared with LT1613CS5#TRPBF, LT1615ES5#TRPBF trades higher voltage capability and lower IQ for reduced switching frequency and larger passive components, while LT1307CS5#TRPBF offers simpler integration at the cost of output flexibility and peak current delivery - making LT1613CS5#TRPBF the optimal balance of miniaturization, topology versatility, and single-cell compatibility.
Availability
LT1613CS5#TRPBF is available at Aetrix Electronics and suitable for digital camera power management, TFT LCD bias generation, portable medical diagnostics, PC Card local regulation, and battery-backed sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for LT1613CS5#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1613 family.
The LT1613CS5#TRPBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for space-constrained, battery-operated systems demanding high efficiency at ultra-low input voltages and multi-topology flexibility.
FAQ
What input voltage range does the LT1613CS5#TRPBF support?
The LT1613CS5#TRPBF supports an input voltage range of 1.1V to 10V, with guaranteed operation down to 1.1V - enabling direct regulation from single alkaline, NiMH, or Li-ion cells. Absolute maximum VIN is 10V; exceeding this risks permanent damage. The device maintains regulation across the full –40°C to +85°C temperature range within these limits.
Can the LT1613CS5#TRPBF be used in SEPIC topology?
Yes, the LT1613CS5#TRPBF is explicitly qualified for SEPIC operation, as confirmed in its datasheet Figure 3 and Typical Applications section. Its 36V switch rating, 86% max duty cycle, and current-mode control enable stable regulation where output voltage may be higher or lower than input - e.g., generating 5V from 3–10V input. External coupled or uncoupled inductors (e.g., 22µH) are required.
What is the maximum output voltage achievable with LT1613CS5#TRPBF?
The LT1613CS5#TRPBF supports output voltages up to 34V, constrained by its 36V-rated internal switch. This is achieved using an external resistor divider on the FB pin (VOUT = 1.23V × (1 + R1/R2)). The device has been validated in applications delivering 15V/60mA from four alkaline cells and 16V/20mA from Li-ion - all with confirmed stability and efficiency.
Does LT1613CS5#TRPBF require external compensation components?
No, the LT1613CS5#TRPBF features fully internal compensation, eliminating the need for external RC networks. Its current-mode architecture with integrated ramp generator and error amplifier ensures stability with standard tantalum or ceramic output capacitors. When using low-ESR ceramics, a phase-lead capacitor (e.g., 330pF) in series with a 10kΩ resistor to FB is recommended to restore phase margin.
What package type and lead finish does LT1613CS5#TRPBF use?
The LT1613CS5#TRPBF uses a 5-lead plastic SOT-23 package (JEDEC MO-178AA), with dimensions 2.9mm × 1.6mm × 1.1mm. It features RoHS-compliant matte tin lead finish, rated for soldering at 300°C for 10 seconds. The part marking on top is "LTED", consistent with Linear Technology's S5 package identification.
LT1613CS5#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):
- 0.9V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 550mA (Switch)
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1613CS5#TRPBF FAQ
1.How can I place an order for LT1613CS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1613CS5#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 LT1613CS5#TRPBF reliable?
The price and inventory of LT1613CS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1613CS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1613CS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1613CS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1613CS5#TRPBF?
LT1613CS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1613CS5#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 LT1613CS5#TRPBF?
For technical support, including LT1613CS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1613CS5#TRPBF requirements.
6.How does Aetrix verify that LT1613CS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1613CS5#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 LT1613CS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1613CS5#TRPBF?
All LT1613CS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1613CS5#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 LT1613CS5#TRPBF part is unused and in its original packaging.
Return procedure for LT1613CS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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