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Analog Devices Inc. LT1615ES5#TRMPBF
- Part No.:
- LT1615ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1615ES5#TRMPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT1615ES5#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in a 5-lead ThinSOT™ package, featuring 350mA switch current limit, 1.2V–15V input range, and 34V max output voltage. It delivers high efficiency in space-constrained portable systems such as LCD bias supplies and handheld computers using fixed off-time control and a 250mV VCE(SAT) NPN switch.
For engineers reviewing the LT1615ES5#TRMPBF datasheet, LT1615ES5#TRMPBF pinout, LT1615ES5#TRMPBF application, or LT1615ES5#TRMPBF equivalent, key selection criteria include quiescent current (20µA active / 0.5µA shutdown), FB reference voltage (1.23V), switch off-time (400ns), and compatibility with low-profile 4.7µH–10µH inductors for compact boost topologies.
Technical Context
The LT1615ES5#TRMPBF implements a constant off-time, current-limited switching architecture with an internal 350mA NPN power switch and 1.23V ±25mV feedback reference. Its 400ns minimum off-time enables use of small inductors while maintaining stability across 1.2V–15V input and up to 34V output.
Operation relies on hysteresis-based regulation: when FB falls below ~1.222V, the switch activates until current reaches 350mA; then the 400ns off-time begins. At light loads, burst-mode behavior reduces quiescent current to 20µA, dropping to 0.5µA in shutdown-critical for battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2V to 15V - supports single- and multi-cell alkaline/NiMH and Li-ion sources without external LDO pre-regulation. |
| Switch Current Limit | 350mA - sets maximum inductor ramp current, enabling ≥12mA output at 20V from 2.5V input in typical LCD bias designs. |
| Quiescent Current | 20µA (active), 0.5µA (shutdown) - extends battery life in always-on or low-duty-cycle portable devices. |
| FB Reference Voltage | 1.23V ±25mV - defines output via R1/R2 divider; 8mV hysteresis improves light-load regulation and noise immunity. |
| Switch Off-Time | 400ns - enables use of ≤10µH inductors (e.g., Murata LQH3C100K24), minimizing board area in ThinSOT layouts. |
| Max Output Voltage | 34V - sufficient for LCD bias, PIN diode drivers, and dual-rail ±20V converters without transformers. |
| VCE(SAT) @ 300mA | 250mV - reduces conduction loss and thermal rise, supporting >75% efficiency at 12mA load with 4.2V input. |
Pinout & Package
LT1615ES5#TRMPBF uses a 5-lead plastic SOT-23 (ThinSOT™) package, 1mm profile, 3.0mm × 1.75mm footprint. Pin 1 (SW) connects to the collector of the internal NPN switch; Pin 2 (GND) requires direct local ground plane tie; Pin 3 (FB) senses output via resistive divider; Pin 4 (SHDN) enables/disables with logic-level thresholds (≥0.9V / ≤0.25V); Pin 5 (VIN) must be bypassed with ≥4.7µF ceramic capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (SW) | Switch Collector | Drives external inductor; trace area must be minimized to reduce EMI radiation from high di/dt node. |
| Pin 2 (GND) | Power Ground | Reference for all internal circuitry; must connect directly to low-impedance ground plane near VIN and CIN. |
| Pin 3 (FB) | Feedback Input | Senses output voltage via resistor divider; 30nA bias current allows high-value dividers (e.g., 2MΩ/130kΩ for 20V). |
| Pin 4 (SHDN) | Enable Control | Logic-compatible shutdown: <0.25V disables switching and reduces IQ to 0.5µA; ≥0.9V enables full operation. |
| Pin 5 (VIN) | Input Supply | Accepts 1.2V–15V; requires local 4.7µF ceramic decoupling placed within 2mm of pin for stable start-up and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 20µA quiescent current enables >1-year battery life in 10µA-average-current handheld instruments. |
| Low-Voltage Start-Up | Operates down to 1.2V input - powers 3.3V logic from partially discharged 2-cell alkaline or NiMH batteries. |
| High-Voltage Output Capability | 36V-rated switch supports 34V outputs - eliminates need for transformer-based topologies in LCD and sensor bias rails. |
| Fixed Off-Time Control | 400ns minimum off-time ensures stable operation with tiny inductors (4.7µH–10µH), reducing BOM cost and PCB area. |
| Integrated Protection | Current limiting and reduced off-time (1.5µs) under low-FB conditions prevent thermal runaway during short-circuit or start-up. |
Applications
| LCD Bias Supply | Handheld Computer Power |
|---|---|
Use Scenario: Generating +20V bias for STN/TN 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 400ns off-time. Use Value: Delivers 12mA at 20V from 2.5–4.2V Li-ion input with >75% efficiency and <10mV ripple using 4.7µF/1µF ceramic caps and 10µH inductor. | Use Scenario: Providing 3.3V rail for microcontroller, display, and USB interface in ruggedized field data loggers. IC Role / Device Role / Timing Role: Main system DC/DC converter; enabled by host MCU GPIO during active periods, shut down during sleep. Use Value: Extends 2xAA alkaline battery life by 3.5× vs. linear regulators due to 20µA IQ and >80% efficiency at 10–60mA loads. |
| Battery Backup System | Dual-Rail ±20V Converter |
Use Scenario: Maintaining real-time clock and SRAM voltage during main power failure in industrial PLCs and telecom base stations. IC Role / Device Role / Timing Role: Standby boost converter activated only when main supply drops below threshold; low 0.5µA shutdown current prevents battery drain. Use Value: Enables >5-year backup from CR2032 coin cell by combining 0.5µA shutdown IQ, 1.2V start-up, and minimal external component count. | Use Scenario: Generating isolated ±20V rails for op-amp signal conditioning and ADC reference in portable test equipment. IC Role / Device Role / Timing Role: Core of charge-pump-assisted dual-output topology using two diodes and three capacitors; FB regulates positive rail, negative rail derived passively. Use Value: Achieves ±20V at 4mA each rail from 1.5–5V input with no transformer or additional ICs-reducing size and EMI vs. inverting buck-boost solutions. |
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 |
|---|---|---|---|
| LT1615IS5#TRMPBF | Same electrical specs but specified for –40°C to 85°C industrial temperature range (vs. 0°C to 70°C for LT1615ES5#TRMPBF). | Required for automotive cabin modules or outdoor industrial sensors where extended ambient temperature operation is mandatory. | Select LT1615IS5#TRMPBF when operating beyond 70°C ambient or requiring guaranteed performance over full industrial range. |
| LT1307CS8#TRPBF | 600kHz PWM (vs. variable-frequency constant off-time); lower 300mA switch limit; MSOP-8 package (vs. SOT-23-5); 1.5V min input. | Better suited for higher-frequency, lower-noise applications where EMI filtering is critical; not suitable for <1.5V inputs or >300mA peak loads. | Choose LT1307CS8#TRPBF only if fixed-frequency operation, tighter ripple control, or MSOP layout compatibility outweighs size and ultra-low-IQ advantages of LT1615ES5#TRMPBF. |
Compared with LT1615IS5#TRMPBF, the LT1615ES5#TRMPBF trades extended temperature rating for lower cost and qualification scope; compared with LT1307CS8#TRPBF, it offers superior micropower performance and smaller footprint but less predictable switching frequency-making it optimal for battery-sensitive, space-constrained boost applications below 350mA.
Availability
LT1615ES5#TRMPBF is available at Aetrix Electronics and suitable for LCD bias supplies, handheld computer power rails, and battery backup systems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LT1615ES5#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 precision analog and power management portfolio. Linear pioneered high-efficiency, low-quiescent-current DC/DC conversion for portable electronics.
The LT1615ES5#TRMPBF belongs to Linear's ThinSOT™ micropower DC/DC converter family, designed specifically for space- and energy-constrained applications including LCD displays, handheld instrumentation, and battery-powered sensors.
FAQ
What is the minimum input voltage required for LT1615ES5#TRMPBF to start switching?
The LT1615ES5#TRMPBF requires a minimum input voltage of 1.2V to initiate switching and regulate output. Below this threshold, the internal bandgap reference and control circuitry cannot operate reliably. This enables operation directly from nearly depleted 2-cell alkaline or NiMH batteries, extending usable battery life in portable devices powered by LT1615ES5#TRMPBF.
Can LT1615ES5#TRMPBF generate 34V output from a 3.3V input?
Yes, the LT1615ES5#TRMPBF can generate up to 34V output from a 3.3V input using a standard boost topology with appropriate external components: a 10µH inductor (e.g., Murata LQH3C100K24), Schottky diode (e.g., MBR0530), and 1µF/20V output capacitor. Efficiency drops at high step-up ratios, but the 36V switch rating and 350mA current limit ensure reliable operation per the LT1615ES5#TRMPBF datasheet specifications.
What is the function of the 4.7pF capacitor shown in LT1615ES5#TRMPBF typical application circuits?
The 4.7pF capacitor is a feed-forward capacitor placed across the upper feedback resistor (R1) in the LT1615ES5#TRMPBF voltage divider network. It improves transient response and reduces output voltage ripple by injecting high-frequency error signal directly into the FB node, compensating for phase lag in the control loop. This passive technique is documented in the LT1615ES5#TRMPBF datasheet as a proven method to lower ripple without increasing component count or board area.
How does LT1615ES5#TRMPBF behave during output short-circuit conditions?
Under output short-circuit, the LT1615ES5#TRMPBF enters a protective mode: when FB voltage drops below ~0.6V, the switch off-time increases from 400ns to 1.5µs and the current limit reduces to ~250mA (70% of nominal). This lowers average inductor current and power dissipation in both the LT1615ES5#TRMPBF switch and external components, preventing thermal damage while maintaining safe, current-limited operation until fault clearance.
Is LT1615ES5#TRMPBF pin-compatible with LT1615-1 variants like LT1615ES5-1#TRMPBF?
No, LT1615ES5#TRMPBF is not pin-compatible with LT1615ES5-1#TRMPBF in functional terms despite identical pinout and package. The LT1615ES5#TRMPBF has a 350mA switch current limit and 1.2V minimum input, whereas LT1615ES5-1#TRMPBF is rated for 100mA and starts at 1.0V input. Swapping them without adjusting external components (especially inductor and feedback resistors) will cause overcurrent or regulation failure. Always verify variant suffix and datasheet revision before substitution of LT1615ES5#TRMPBF.
LT1615ES5#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1615ES5#TRMPBF FAQ
1.How can I place an order for LT1615ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1615ES5#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 LT1615ES5#TRMPBF reliable?
The price and inventory of LT1615ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1615ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1615ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1615ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1615ES5#TRMPBF?
LT1615ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1615ES5#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 LT1615ES5#TRMPBF?
For technical support, including LT1615ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1615ES5#TRMPBF requirements.
6.How does Aetrix verify that LT1615ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1615ES5#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 LT1615ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1615ES5#TRMPBF?
All LT1615ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1615ES5#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 LT1615ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LT1615ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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