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Analog Devices Inc. LT1613CS5#TRMPBF
- Part No.:
- LT1613CS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1613CS5#TRMPBF.pdf
- Description:
- IC REG BST FLYBACK ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1613CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a current-mode, fixed-frequency 1.4MHz step-up DC/DC converter in a 5-lead SOT-23 package, designed for ultra-low-input-voltage operation down to 1.1V and capable of generating up to 34V output. It integrates a 36V-rated switch with 300mV VCE(SAT) at 300mA, delivers 5V at 200mA from 3.3V input, and features internal compensation and <1µA shutdown current. It serves as a compact, high-efficiency power source in space-constrained battery-powered systems.
For engineers reviewing the LT1613CS5#TRMPBF datasheet, LT1613CS5#TRMPBF pinout, LT1613CS5#TRMPBF application, or LT1613CS5#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world efficiency curves, and precise alternative selection guidance for boost, SEPIC, and flyback topologies requiring sub-2V startup and minimal board area.
Technical Context
The LT1613CS5#TRMPBF implements a constant-frequency, internally compensated current-mode PWM architecture with a 1.4MHz oscillator, enabling predictable low-noise output and compatibility with miniature 2mm-height inductors and ceramic/tantalum capacitors. Its bandgap reference core operates stably down to VIN = 1V, and the error amplifier's VC node directly regulates switch current cycle-by-cycle.
It supports multiple topologies: boost (up to 34V), SEPIC (output spanning input range), and flyback. The 36V-rated switch, 86% max duty cycle, and 800mA current limit allow robust operation across input ranges from 1.1V to 10V, while the FB pin's 1.23V reference enables precise output voltage setting via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.4MHz typical - enables use of tiny inductors <2mm height and reduces output ripple filtering burden |
| Input Voltage Range | 1.1V to 10V - supports single-cell alkaline, NiMH, Li-ion, and multi-cell configurations without pre-regulation |
| Feedback Reference Voltage | 1.23V ±2.5% - sets output via R1/R2 divider; enables stable 5V, 12V, 15V, or 34V outputs |
| Switch Current Limit | 550mA min - defines maximum deliverable load current before foldback or hiccup protection activates |
| VCE(SAT) @ 300mA | 300mV typical - minimizes conduction loss and thermal rise in high-efficiency boost designs |
| Shutdown Current | <1µA at VIN = 2V - preserves battery life in always-on or intermittent-use portable devices |
| Operating Temperature | 0°C to 70°C (Commercial grade) - validated performance for consumer and industrial embedded applications |
Pinout & Package
LT1613CS5#TRMPBF 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) | Power Switch Drain | Connects to inductor/diode node; high dI/dt path requiring minimized trace area to reduce EMI |
| GND (Pin 2) | Power & Signal Ground | Must tie directly to local ground plane; single-point connection to system ground avoids switching noise coupling |
| FB (Pin 3) | Feedback Input | Monitors output via resistive divider; 1.23V reference enables precise VOUT = 1.23V(1 + R1/R2); sensitive to noise |
| SHDN (Pin 4) | Enable/Shutdown Control | Logic-high ≥1V enables regulation; grounded disables switch and reduces IQ to <1µA |
| VIN (Pin 5) | Main Power Input | Accepts 1.1V–10V; requires local bypass capacitor placed <5mm away to prevent oscillation or regulation failure |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Startup Voltage | Operates from 1.1V input - powers 3.3V/5V rails directly from single alkaline/NiMH or Li-ion cells |
| Internally Compensated Loop | No external compensation components required - simplifies design and reduces BOM count for SOT-23 footprint |
| High-Voltage Switch | 36V-rated NPN transistor - supports boost outputs up to 34V and SEPIC/flyback topologies without external FET |
| Tiny Footprint Integration | Entire DC/DC function occupies <0.2 in² PCB area - enables per-rail regulation in PC cards, digital cameras, and medical sensors |
| Low-Noise Current-Mode Control | Fixed 1.4MHz frequency + ramp injection - yields predictable ripple spectrum easily filtered with small LC networks |
Applications
| Digital Camera Power Supply | LCD Bias Generation |
|---|---|
Use Scenario: Generating multiple isolated rails (5V/50mA, 12V/10mA, –7.5V/10mA) from 4-cell alkaline input in compact digital cameras. IC Role / Device Role / Timing Role: Primary step-up/SEPIC controller managing three regulated outputs using coupled inductors and Schottky diodes. Use Value: Eliminates need for custom transformers or discrete charge pumps; achieves full rail generation within 0.2 in² using only LT1613CS5#TRMPBF and ceramic caps. | Use Scenario: Providing ±8V and +24V bias for TFT LCD panels from a 3.3V supply in handheld medical diagnostic equipment. IC Role / Device Role / Timing Role: Core boost/SEPIC controller driving transformer-coupled negative and positive outputs with all-ceramic filtering. Use Value: Delivers low-noise, tightly regulated bias voltages with <1% line/load regulation and no tantalum dependency. |
| Battery Backup System | Portable Modem Power |
Use Scenario: Maintaining 5V/30mA local supply during main power failure using four alkaline cells in backup mode. IC Role / Device Role / Timing Role: Standby DC/DC converter activated by SHDN pin; operates in pulse-skipping mode under light load. Use Value: Draws <1µA in shutdown and starts regulation within 200µs - extends backup runtime and ensures rapid system recovery. | Use Scenario: Converting 3.3V USB or battery input to stable 5V/200mA for external modems in cordless phones and pagers. IC Role / Device Role / Timing Role: High-efficiency boost regulator with integrated switch, supporting >85% peak efficiency at 100mA load. Use Value: Enables direct 3.3V-to-5V conversion without intermediate LDOs, reducing heat and component count in slim form factors. |
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#TRMPBF | Higher max input (20V), lower IQ (30µA), same 5-lead SOT-23 but 2.2MHz switching frequency | Better suited for 2.5V–20V inputs and higher-frequency filtering; not rated below 2.5V startup | Select when input exceeds 2.5V and higher switching frequency is acceptable; avoid for sub-1.5V battery start-up |
| LT1307CS5#TRMPBF | 600kHz fixed frequency, 1V min input, 3.3V/75mA output capability, lower max output voltage (20V) | Optimized for ultra-low-power single-cell apps; insufficient for 5V/200mA or 34V boost requirements | Choose for micropower <100mA 3.3V rails where size and IQ matter more than output voltage or current |
Compared with LT1613CS5#TRMPBF, LT1615ES5#TRMPBF trades sub-1.5V startup for higher input range and frequency, while LT1307CS5#TRMPBF offers lower quiescent current but cannot meet the 5V/200mA or 34V output demands - making LT1613CS5#TRMPBF uniquely balanced for 1.1V–10V, high-current, high-voltage boost/SEPIC in minimal area.
Availability
LT1613CS5#TRMPBF is available at Aetrix Electronics and suitable for digital camera power supplies, LCD bias generation, battery backup systems, and portable modem designs requiring stable component supply, long-lifecycle support, and guaranteed commercial-grade performance.
Supply support for LT1613CS5#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1613 series.
The LT1613CS5#TRMPBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for ultra-low-input-voltage, high-frequency boost and SEPIC applications in space- and energy-constrained portable electronics.
FAQ
What is the minimum input voltage required for LT1613CS5#TRMPBF to start regulation?
The LT1613CS5#TRMPBF guarantees operation down to 1.1V input voltage, with typical startup observed at 0.9V. This enables direct powering from single alkaline, NiMH, or Li-ion cells without preboost circuitry. Below 1.1V, regulation may become unstable or cease entirely; the device's bandgap reference core remains functional at VIN = 1V, but full specification compliance begins at 1.1V per the datasheet's Electrical Characteristics table.
Can LT1613CS5#TRMPBF be used in SEPIC topology, and what are the key layout considerations?
Yes, LT1613CS5#TRMPBF supports SEPIC topology, as confirmed in its Block Diagram, Typical Applications (Figures 3, 13–15), and Absolute Maximum Ratings (SW pin rated to 36V). Key layout requirements include placing C1 within 5mm of VIN, tying C2's ground directly to Pin 2 (GND), using wide traces for SW/GND loops, and isolating the FB node with R3 + CPL when using ceramic output capacitors to maintain phase margin - all detailed in the Layout and Operation with Ceramic Capacitors sections of the official datasheet.
What is the maximum achievable output voltage using LT1613CS5#TRMPBF?
The LT1613CS5#TRMPBF supports output voltages up to 34V, limited by its 36V-rated internal switch and absolute maximum SW pin rating. This is demonstrated in the "15V at 60mA from Four Alkaline Cells" and "Li-Ion to 16V/20mA" application examples. Output voltage is set externally via the FB divider; stability and efficiency depend on proper inductor saturation current (>500mA), diode PIV rating (>36V), and capacitor voltage rating exceeding VOUT.
Does LT1613CS5#TRMPBF require external compensation components?
No, LT1613CS5#TRMPBF is internally compensated, as explicitly stated in its FEATURES list and BLOCK DIAGRAM (RC and CC shown as internal). No external compensation network is needed for standard boost or SEPIC configurations with recommended tantalum or ceramic output capacitors. When using low-ESR ceramic capacitors, a phase-lead capacitor (CPL) and isolating resistor (R3) must be added in series with the FB pin - not for compensation tuning, but to restore phase margin lost due to missing ESR zero.
What is the typical efficiency of LT1613CS5#TRMPBF when converting 3.3V to 5V at 200mA?
At 3.3V input to 5V/200mA output, LT1613CS5#TRMPBF achieves approximately 85% peak efficiency, as shown in Figure 1 (Efficiency Curve) with VIN = 3.5V and load current near 200mA. Efficiency drops to ~75% at 1.5V input and remains above 70% even at 1.5V/100mA. Real-world results depend on inductor DCR, diode forward voltage, and PCB layout - the datasheet's TA01 schematic uses MURATA LQH3C4R7M24 and MBR0520 to achieve these values.
LT1613CS5#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):
- 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#TRMPBF FAQ
1.How can I place an order for LT1613CS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1613CS5#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 LT1613CS5#TRMPBF reliable?
The price and inventory of LT1613CS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1613CS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1613CS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1613CS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1613CS5#TRMPBF?
LT1613CS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1613CS5#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 LT1613CS5#TRMPBF?
For technical support, including LT1613CS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1613CS5#TRMPBF requirements.
6.How does Aetrix verify that LT1613CS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1613CS5#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 LT1613CS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1613CS5#TRMPBF?
All LT1613CS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1613CS5#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 LT1613CS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT1613CS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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