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Analog Devices Inc. LT1615IS5#TRMPBF
- Part No.:
- LT1615IS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1615IS5#TRMPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,778
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Product details
Overview
LT1615IS5#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in a 5-lead ThinSOT™ package, designed for higher-power portable systems with 1.2V–15V input, 350mA switch current limit, and up to 34V output voltage. It delivers regulated bias for LCDs, powers handheld computers from single-cell Li-ion, and supports battery backup circuits with only 20µA quiescent current.
For engineers reviewing the LT1615IS5#TRMPBF datasheet, LT1615IS5#TRMPBF pinout, LT1615IS5#TRMPBF application, or LT1615IS5#TRMPBF equivalent, key selection criteria include its 400ns fixed off-time control, 250mV VCE(SAT) at 300mA, –40°C to 85°C industrial temperature rating, and compatibility with low-profile 4.7µH–22µH inductors and ceramic output capacitors.
Technical Context
The LT1615IS5#TRMPBF implements a constant off-time, current-limited boost topology using an internal NPN power switch rated to 36V. Its feedback comparator regulates output voltage via external resistor divider (1.23V reference), with 8mV hysteresis enabling burst-mode operation at light loads.
Startup and short-circuit protection dynamically extend switch off-time to 1.5µs and reduce current limit to ~250mA when FB voltage drops below 600mV-reducing dissipation without external circuitry. The 400ns minimum off-time enables high-frequency switching with miniature passive components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - supports single-cell Li-ion (2.5–4.2V), two-cell alkaline (1.5–3V), and wide-input industrial rails. |
| Switch Current Limit | 300mA to 350mA - sets maximum inductor ramp current; determines peak output capability in boost mode. |
| Quiescent Current | 20µA active / 0.5µA shutdown - enables multi-year battery life in always-on sensor or backup applications. |
| Feedback Reference | 1.23V ±25mV - defines output regulation point; used with R1/R2 to set VOUT = 1.23 × (1 + R1/R2). |
| Switch Off-Time | 400ns (min) - enables use of sub-10µH inductors and reduces board area in space-constrained designs. |
| VCE(SAT) | 250mV at 300mA - minimizes conduction loss and thermal rise during high-current pulses. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin-ambient environments. |
Pinout & Package
LT1615IS5#TRMPBF is housed in a 5-lead plastic SOT-23 (ThinSOT™) package, 1mm profile, 3.0mm × 1.75mm footprint, with gull-wing leads compatible with standard reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Collector | Internal NPN collector node; connects to inductor and Schottky diode anode; requires minimal trace area to suppress EMI. |
| GND (Pin 2) | Power Ground | Main return path for switch current and IC bias; must tie directly to local ground plane for stability. |
| FB (Pin 3) | Feedback Input | Senses divided output voltage; comparator triggers switch on/off based on 1.23V threshold and 8mV hysteresis. |
| SHDN (Pin 4) | Shutdown Control | Active-high enable: ≥0.9V enables operation; ≤0.25V forces 0.5µA shutdown mode. |
| VIN (Pin 5) | Input Supply | Primary power input; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 20µA quiescent current enables >5-year runtime on CR2032 coin cell in low-duty-cycle monitoring systems. |
| High-Voltage Switch | 36V-rated SW pin allows direct generation of 34V outputs-eliminates need for transformer-based topologies in LCD bias supplies. |
| Fixed Off-Time Control | 400ns minimum off-time ensures stable operation across load and input variations while enabling ultra-small inductor selection. |
| Low VCE(SAT) | 250mV saturation voltage at 300mA reduces conduction loss by >40% vs. typical 500mV switches-critical for efficiency in 1–3W portable converters. |
| Industrial Temp Range | –40°C to +85°C guaranteed performance supports deployment in uncontrolled environments like factory HMIs and outdoor IoT nodes. |
Applications
| LCD Bias Generation | Handheld Computer Power |
|---|---|
Use Scenario: Generating 20V bias for TFT-LCD panels in portable medical monitors and industrial displays. IC Role / Device Role / Timing Role: Primary boost regulator controlling inductor current ramp and diode conduction timing to maintain precise 20V output under varying panel capacitance loads. Use Value: Delivers 12mA at 20V from 2.5–4.2V Li-ion with >75% efficiency across input range-enabling compact, fanless display designs. | Use Scenario: Stepping up 1.5–3V from two AA/AAA cells to stable 3.3V for ARM Cortex-M microcontrollers and Wi-Fi modules. IC Role / Device Role / Timing Role: Core power conversion element using fixed off-time control to sustain regulation during CPU burst loads up to 60mA. Use Value: Achieves 85% peak efficiency at 3V input and 60mA load-extending battery life while fitting within 3.0mm × 1.75mm PCB area budget. |
| Battery Backup Supply | PIN Diode Driver |
Use Scenario: Providing uninterrupted 5V rail during main power failure in telecom line cards and PLC I/O modules. IC Role / Device Role / Timing Role: Standby boost converter activated by SHDN signal upon AC loss; maintains regulation via feedback loop during capacitor hold-up period. Use Value: Draws only 0.5µA in shutdown-preserving supercapacitor or backup battery charge for >72 hours before activation. | Use Scenario: Driving high-voltage reverse-biased PIN diodes in RF front-end attenuators and antenna switches. IC Role / Device Role / Timing Role: High-voltage generator producing 35V at 500µA to bias PIN diode junctions-operating in low-noise burst mode to minimize RF interference. Use Value: Delivers clean, ripple-free 35V with <10mVpp noise using 4.7pF feed-forward capacitor-ensuring consistent RF insertion loss and isolation. |
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 | Same electrical specs but rated for 0°C to 70°C ambient; lacks extended industrial temperature qualification. | Suitable for commercial-grade consumer devices where ambient stays within 0–70°C. | Select LT1615IS5#TRMPBF when operating in cold storage, outdoor enclosures, or industrial control cabinets. |
| LT1316CS8#TRPBF | Programmable current limit (100–500mA), Burst Mode™ operation, 8-pin SO-8 package; no ThinSOT footprint. | Better suited for variable-load applications requiring dynamic current limiting and lower light-load ripple. | Choose LT1615IS5#TRMPBF for space-constrained designs needing fixed 350mA limit and minimal board area. |
Compared with LT1615ES5#TRMPBF, the LT1615IS5#TRMPBF guarantees full specification compliance over –40°C to +85°C, making it essential for harsh-environment reliability; versus LT1316CS8#TRPBF, it offers 45% smaller footprint and simpler external component count at the cost of programmability and multi-mode control.
Availability
LT1615IS5#TRMPBF is available at Aetrix Electronics and suitable for LCD bias generation, handheld computer power, and battery backup systems requiring stable component supply, long-term lifecycle support, and industrial-temperature assurance.
Supply support for LT1615IS5#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 continues to manufacture and support its precision analog and power management portfolio.
The LT1615 product line was developed to deliver high-efficiency, ultra-low-quiescent-current boost conversion in minimal footprints-targeting portable instrumentation, medical wearables, and industrial edge sensors where battery life and board space are critical.
FAQ
What is the minimum input voltage required for LT1615IS5#TRMPBF to start switching?
The LT1615IS5#TRMPBF begins switching at VIN ≥ 1.2V. Below this threshold, the internal bandgap reference and control circuitry cannot establish stable operation. This 1.2V minimum enables reliable startup from partially discharged single-cell Li-ion batteries down to 2.5V nominal, and supports two-cell alkaline inputs even at end-of-life.
Can LT1615IS5#TRMPBF be used in SEPIC topology, and what design changes are needed?
Yes, LT1615IS5#TRMPBF supports SEPIC operation using dual inductors and modified feedback network. The datasheet provides a verified 4–6V input to 5V output SEPIC reference design. Key changes include adding a second 10µH inductor (L2), adjusting R1/R2 for 5V output, and ensuring both inductors share identical DCR and saturation current ratings to balance current sharing and prevent core saturation.
What is the purpose of the 4.7pF capacitor in the feedback network of LT1615IS5#TRMPBF?
The 4.7pF capacitor placed across R1 in the LT1615IS5#TRMPBF feedback divider acts as a feed-forward compensation element. It reduces output voltage ripple by injecting high-frequency switch-node transients into the FB node-counteracting inductor current ripple and improving transient response. This capacitor is especially effective in high-impedance dividers used for >12V outputs and is documented in Figure TA03 and TA07 of the LT1615 datasheet.
How does LT1615IS5#TRMPBF behave during output short-circuit conditions?
Under sustained output short, the LT1615IS5#TRMPBF enters foldback protection: FB voltage collapses below 600mV, triggering extended 1.5µs off-time and reduced ~250mA current limit. This limits average power dissipation in the internal switch and external components, preventing thermal runaway. Recovery is automatic once short is removed and FB rises above hysteresis threshold.
Which Schottky diodes are recommended for use with LT1615IS5#TRMPBF in 20V-output applications?
For 20V-output applications, the Motorola MBR0530 (30V, 0.5A Schottky) is explicitly validated in the LT1615IS5#TRMPBF datasheet (TA01). Equivalent alternatives include Diodes Inc. AP1509W6-13 (30V, 1A) and ON Semiconductor SBM130 (30V, 1A), provided forward voltage remains ≤0.4V at peak inductor current and reverse leakage stays <5µA at 20V.
LT1615IS5#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, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 300mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1615IS5#TRMPBF FAQ
1.How can I place an order for LT1615IS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1615IS5#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 LT1615IS5#TRMPBF reliable?
The price and inventory of LT1615IS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1615IS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1615IS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1615IS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1615IS5#TRMPBF?
LT1615IS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1615IS5#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 LT1615IS5#TRMPBF?
For technical support, including LT1615IS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1615IS5#TRMPBF requirements.
6.How does Aetrix verify that LT1615IS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1615IS5#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 LT1615IS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1615IS5#TRMPBF?
All LT1615IS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1615IS5#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 LT1615IS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT1615IS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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