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Analog Devices Inc. LT1615IS5#TRPBF
- Part No.:
- LT1615IS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1615IS5#TRPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,153
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Product details
Overview
LT1615IS5#TRPBF 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 20µA quiescent current and 400ns minimum off-time.
For engineers reviewing the LT1615IS5#TRPBF datasheet, LT1615IS5#TRPBF pinout, LT1615IS5#TRPBF application, or LT1615IS5#TRPBF equivalent, key selection criteria include input voltage range (1.2V min), shutdown current (<1µA), FB reference voltage (1.23V), switch VCE(SAT) (250mV at 300mA), and ThinSOT thermal performance (θJA = 256°C/W).
Technical Context
The LT1615IS5#TRPBF uses a constant off-time control architecture with internal NPN power switch and bandgap-regulated feedback comparator (1.23V ±25mV trip point, 8mV hysteresis). Its 400ns fixed off-time enables high-frequency operation with small external magnetics, while the 36V-rated switch supports boost topologies up to 34V without transformers.
It integrates start-up protection and short-circuit mitigation: when FB falls below ~600mV, off-time extends to 1.5µs and current limit reduces to ~250mA. The device operates across –40°C to +85°C and features 0.5µA shutdown current, 20µA no-load quiescent current, and 250mV VCE(SAT) at 300mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - supports single-cell Li-ion (2.5–4.2V) and multi-cell alkaline/NiMH inputs without pre-regulation |
| Switch Current Limit | 350mA - enables ≥12mA output at 20V (e.g., LCD bias) with typical 10µH inductor and Schottky diode |
| Quiescent Current | 20µA active / 0.5µA shutdown - extends battery life in always-on portable devices like digital cameras |
| Feedback Reference | 1.23V ±25mV - sets output via resistor divider (R1/R2); 8mV hysteresis improves light-load regulation stability |
| Switch Off-Time | 400ns (min) - allows use of sub-5mm footprint inductors (e.g., Murata LQH3C100K24) and low-ESR ceramics |
| Max Switch Voltage | 36V - supports 34V output in simple boost configuration; eliminates need for transformer-based isolation |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin-temperature applications |
Pinout & Package
LT1615IS5#TRPBF is housed in a 5-lead plastic SOT-23 (ThinSOT™) package, 1mm profile, with exposed pad not connected internally. Package dimensions: 2.80–3.10mm × 1.90mm × 1.00mm max (JEDEC MO-193 / EIAJ SC-74A compatible).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | Connects to inductor and Schottky anode; minimize trace area to reduce EMI and switching losses |
| GND (Pin 2) | Power and signal ground reference | Must tie directly to local ground plane; serves as return path for switch current and FB divider |
| FB (Pin 3) | Inverting input of error amplifier | Sets output voltage: VOUT = 1.23V × (1 + R1/R2); bias current ≤80nA minimizes divider error |
| SHDN (Pin 4) | Enable/disable control input | Logic-high (>0.9V) enables operation; <0.25V forces shutdown with 0.5µA supply current |
| VIN (Pin 5) | Main input supply | Accepts 1.2–15V; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 20µA quiescent current enables >1-year battery life in low-duty-cycle sensor nodes using CR2032 |
| Ultra-low shutdown current | 0.5µA shutdown draw preserves energy in standby modes-critical for emergency backup systems |
| High-voltage switch | 36V-rated NPN switch supports 34V outputs without external FETs or transformers, reducing BOM count |
| Fixed 400ns off-time | Enables stable operation with 4.7–22µH inductors; avoids sub-harmonic oscillation in boost topology |
| Integrated protection | Auto-reducing current limit and extended off-time during startup/short-circuit prevent thermal runaway |
Applications
| LCD Bias Generation | Handheld Computer Power |
|---|---|
Use Scenario: Generating 20V bias for TFT-LCD panels in portable medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: Primary boost regulator controlling output voltage via FB divider; operates in discontinuous conduction mode with 10µH inductor. Use Value: Delivers 12mA at 20V from 2.5–4.2V Li-ion input with >75% efficiency at 10mA load and 400ns timing precision. | Use Scenario: Stepping up 1.5–3V alkaline/NiMH input to stable 3.3V for ARM Cortex-M microcontrollers in ruggedized field terminals. IC Role / Device Role / Timing Role: Main system power supply; uses 4.7µH inductor and MBR0520 Schottky for minimal footprint and fast transient response. Use Value: Achieves 85% peak efficiency at 60mA load while maintaining 20µA quiescent draw during MCU sleep states. |
| Battery Backup Supply | Digital Camera Flash Charging |
Use Scenario: Providing uninterrupted 5V rail during main power failure in network routers and PoE switches. IC Role / Device Role / Timing Role: Standby boost converter activated by SHDN pin; holds supercapacitor or backup Li-ion at regulated voltage. Use Value: Draws only 0.5µA in shutdown, enabling >3-month hold-up time with 0.47F supercapacitor and 1.2V cutoff. | Use Scenario: Charging high-voltage flash capacitors (300V) from 3.3V logic rails in compact digital cameras. IC Role / Device Role / Timing Role: First-stage boost controller feeding charge-pump or flyback stage; configured for high-voltage gain with 22µH inductor. Use Value: Supports 35V intermediate rail generation (e.g., PIN diode driver) with 15mA output and <1% line regulation over 3–6V input. |
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 |
|---|---|---|---|
| LT1307ES5#TRPBF | 600kHz fixed-frequency PWM; 75mA output capability; 1.5V min input; no shutdown pin | Lower output current; suited for 3.3V/75mA single-cell apps (e.g., Bluetooth modules), not high-voltage bias | Select when fixed frequency and simpler layout outweigh need for 350mA limit or shutdown control |
| LT3467ES5#TRPBF | 2.5V–16V input; 1.3A switch; integrated Schottky; 2.1MHz switching; no 1.23V FB reference | Higher current, faster switching, but larger solution size and different feedback architecture (current-mode) | Choose for >100mA loads or where board space permits larger inductor and higher EMI filtering |
Compared with LT1307ES5#TRPBF and LT3467ES5#TRPBF, the LT1615IS5#TRPBF uniquely balances ultra-low quiescent current (20µA), 350mA switch capability, and 1.23V precision FB reference in a 1mm-profile ThinSOT-making it optimal for space-constrained, battery-sensitive 20–34V bias generation where efficiency at light loads is critical.
Availability
LT1615IS5#TRPBF 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 guaranteed industrial temperature grade (–40°C to +85°C).
Supply support for LT1615IS5#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, datasheet documentation, and reliability testing for legacy Linear parts.
The LT1615 series belongs to Linear's micropower DC/DC converter product line, engineered specifically for space- and energy-constrained portable electronics requiring high-voltage boost with minimal quiescent draw.
FAQ
What is the minimum input voltage supported by the LT1615IS5#TRPBF?
The LT1615IS5#TRPBF supports a minimum input voltage of 1.2V, verified across the full –40°C to +85°C operating temperature range. This enables direct operation from partially discharged single-cell Li-ion batteries (down to ~2.5V) and multi-cell alkaline sources. The LT1615-1 variant lowers this to 1.0V, but the LT1615IS5#TRPBF is specified strictly at 1.2V min per its electrical characteristics table.
Does the LT1615IS5#TRPBF require an external Schottky diode, and why?
Yes, the LT1615IS5#TRPBF requires an external Schottky diode-such as the Motorola MBR0520 or MBR0530-because it integrates only the NPN switch, not the catch diode. The diode completes the boost current path during switch-off periods. Schottky types are mandatory due to their low forward voltage (~0.2–0.4V) and fast recovery, which preserve efficiency and prevent reverse recovery losses that would degrade performance at the LT1615IS5#TRPBF's 400ns off-time.
How does the feedback (FB) pin of the LT1615IS5#TRPBF set output voltage?
The FB pin of the LT1615IS5#TRPBF senses a resistive divider from VOUT and compares it to an internal 1.23V reference. Output voltage is calculated as VOUT = 1.23V × (1 + R1/R2), where R1 connects to VOUT and R2 to GND. The FB pin draws ≤80nA, so high-value resistors (e.g., 2MΩ/130kΩ for 20V) introduce negligible error, enabling precise, low-power regulation without trimming.
What thermal considerations apply to the LT1615IS5#TRPBF in continuous operation?
The LT1615IS5#TRPBF has a junction-to-ambient thermal resistance θJA of 256°C/W. At 350mA switch current and 12V output, power dissipation can reach ~350mW; thus, maximum ambient temperature must stay below ~75°C to keep junction temperature under 125°C. Use of a solid ground plane under the exposed pad area (though unconnected) improves heat spreading, and derating above 65°C ambient is recommended for 10+ year reliability.
Can the LT1615IS5#TRPBF be used in SEPIC topology, and what design changes are needed?
Yes, the LT1615IS5#TRPBF supports SEPIC topology using two equal-value inductors and a coupling capacitor. The key change is replacing the standard boost diode with a second inductor and adding a 1µF–10µF AC-coupling capacitor between SW and the second inductor. Inductor value is calculated as L = (VOUT + VD) × tOFF / ILIM, yielding ~10µH for 5V output from 4.2V input. Efficiency drops ~3–5% versus boost, but SEPIC enables output voltages both above and below VIN.
LT1615IS5#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, 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#TRPBF FAQ
1.How can I place an order for LT1615IS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1615IS5#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 LT1615IS5#TRPBF reliable?
The price and inventory of LT1615IS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1615IS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1615IS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1615IS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1615IS5#TRPBF?
LT1615IS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1615IS5#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 LT1615IS5#TRPBF?
For technical support, including LT1615IS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1615IS5#TRPBF requirements.
6.How does Aetrix verify that LT1615IS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1615IS5#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 LT1615IS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1615IS5#TRPBF?
All LT1615IS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1615IS5#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 LT1615IS5#TRPBF part is unused and in its original packaging.
Return procedure for LT1615IS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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