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Analog Devices Inc. LT1615IS5-1#TRMPBF
- Part No.:
- LT1615IS5-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1615IS5-1#TRMPBF.pdf
- Description:
- IC REG BOOST SEPIC ADJ TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
LT1615IS5-1#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower step-up DC/DC converter in a 5-lead ThinSOT™ package, designed for single-cell battery applications requiring ultra-low quiescent current (20µA active, <1µA shutdown), 1V minimum input voltage, and up to 34V output. It integrates a 100mA current-limited NPN switch with 400ns fixed off-time control and 1.23V feedback reference for precise output regulation in portable LCD bias, handheld computers, and digital camera power rails.
For engineers reviewing the LT1615IS5-1#TRMPBF datasheet, LT1615IS5-1#TRMPBF pinout, LT1615IS5-1#TRMPBF application, or LT1615IS5-1#TRMPBF equivalent, key selection criteria include its 1V–15V input range, 100mA switch current limit, 1.23V FB reference with 8mV hysteresis, 250mV VCE(SAT) at 70mA, and compatibility with low-profile 4.7µH–22µH inductors and ceramic output capacitors.
Technical Context
The LT1615IS5-1#TRMPBF employs a constant off-time, hysteretic control architecture using an internal bandgap reference and comparator A1 to regulate output voltage via the FB pin. Its 400ns off-time enables high-frequency operation with small passive components while maintaining efficiency across load currents from 100µA to 15mA.
During light loads, the device enters burst mode-disabling internal circuitry until FB voltage drops below 1.222V (1.23V – 8mV hysteresis)-reducing quiescent current to 20µA. Under start-up or short-circuit conditions (FB < 600mV), off-time extends to 1.5µs and current limit reduces to ~70mA to limit power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.0V to 15V - supports single-cell Li-ion (2.5–4.2V), alkaline (1.0–1.5V), or NiMH (1.0–1.4V) without external LDO pre-regulation. |
| Switch Current Limit | 75mA to 125mA (typ. 100mA) - sets maximum inductor ramp current; defines peak output capability in boost topology. |
| Feedback Reference | 1.205V to 1.255V (typ. 1.23V) - determines regulated output voltage via external resistor divider (VOUT = 1.23 × (1 + R1/R2)). |
| Quiescent Current | 20µA (active), <1µA (shutdown) - enables >1-year battery life in always-on sensor nodes or backup systems. |
| Switch VCE(SAT) | 85mV to 120mV at 70mA - minimizes conduction loss in low-VIN applications, improving efficiency at light loads. |
| Switch Off-Time | 400ns (normal), 1.5µs (low-FB protection) - fixes minimum switching period; enables use of <10µH inductors for compact layouts. |
| Max Output Voltage | 34V - supports high-voltage LCD bias, PIN diode drivers, and dual-rail ±20V converters without transformers. |
Pinout & Package
LT1615IS5-1#TRMPBF is housed in a 5-lead plastic SOT-23 (ThinSOT™) package, 1mm profile, with gull-wing leads and standard JEDEC MO-193 footprint. Pin 1 (SW) carries high dv/dt switching node; Pin 2 (GND) requires direct connection to local ground plane; Pin 3 (FB) senses output via resistive divider; Pin 4 (SHDN) enables/disables operation with logic-level thresholds; Pin 5 (VIN) supplies input power and must be decoupled with ≥4.7µF ceramic capacitor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Collector of internal NPN switch | High-frequency switching node; minimize trace area to reduce EMI and parasitic inductance. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to low-impedance ground plane; separates analog and power return paths. |
| FB (Pin 3) | Inverting input of error amplifier | Senses output voltage via resistor divider; 30–80nA bias current affects high-value resistor selection. |
| SHDN (Pin 4) | Enable/disable control input | Drives internal bandgap and oscillator; <0.25V disables (0.5µA IQ), >0.9V enables (20µA IQ). |
| VIN (Pin 5) | Main input supply | Accepts 1V–15V; requires local 4.7µF ceramic bypass capacitor placed within 2mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 20µA quiescent current enables multi-year battery life in energy-constrained IoT sensors and wearables. |
| 1V minimum input | Starts regulation from fully depleted alkaline or NiMH cells, eliminating need for auxiliary wake-up circuits. |
| Fixed 400ns off-time | Enables predictable switching frequency scaling with input/output ratio; simplifies EMI filtering design. |
| Integrated 100mA NPN switch | Eliminates external transistor and gate driver; reduces BOM count and PCB area in space-constrained SOT-23 designs. |
| Low 1.23V FB reference | Permits accurate output setting down to 1.5V (e.g., 3.3V with 1.8MΩ/1MΩ divider) using standard 1% resistors. |
Applications
| LCD Bias Generation | Handheld Computer Power |
|---|---|
Use Scenario: Generating 20V bias for STN or TFT LCD panels in portable medical devices or industrial HMIs. IC Role / Device Role / Timing Role: Primary boost regulator controlling output voltage via FB pin; operates in discontinuous conduction mode with 10µH inductor and MBR0530 Schottky diode. Use Value: Delivers stable 20V/12mA from 2.5–4.2V Li-ion cell with >75% efficiency at full load and <20µA sleep current. | Use Scenario: Powering 3.3V logic rails in barcode scanners or ruggedized PDAs powered by two AA alkaline cells (1.5–3.0V). IC Role / Device Role / Timing Role: Step-up converter with SHDN pin controlled by system MCU to enter <1µA shutdown during idle periods. Use Value: Maintains 3.3V output across full battery discharge curve (1.0–3.0V input) while enabling >6-month shelf life in standby. |
| Digital Camera Flash Charging | PIN Diode Driver Supply |
Use Scenario: Charging high-voltage capacitor for xenon flash in compact digital cameras using single-cell Li-ion. IC Role / Device Role / Timing Role: High-efficiency boost stage feeding charge pump; uses 4.7pF feed-forward capacitor to suppress output ripple during rapid load transients. Use Value: Achieves 300V output in cascaded configuration with <5% ripple at 50mA peak load, minimizing flash delay. | Use Scenario: Providing 35V bias for RF PIN diode switches in portable spectrum analyzers or cellular test equipment. IC Role / Device Role / Timing Role: Constant-current-capable boost regulator driving 500µA load; leverages low VCE(SAT) to maintain regulation under varying temperature. Use Value: Delivers stable 35V/500µA from 1–6V input range with <0.1%/°C line regulation and no external compensation. |
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#TRMPBF | 600kHz fixed-frequency PWM; 75mA output; 1.2V min VIN; no shutdown pin | Lacks SHDN control and 1V start-up; better for noise-sensitive audio rails where fixed frequency simplifies filtering | Select when predictable EMI profile and higher output current (75mA vs. 15mA typical for LT1615IS5-1) outweigh ultra-low IQ needs. |
| LT1610IS5#TRMPBF | 1.7MHz fixed-frequency; 30mA output; 1V min VIN; 25µA IQ; no shutdown | Higher frequency allows smaller inductors but lower output current; no enable pin limits power sequencing flexibility | Choose for space-constrained designs needing <1mm inductor height where 30mA output suffices and shutdown is managed externally. |
Compared with LT1615IS5-1#TRMPBF, LT1307ES5#TRMPBF offers higher output current and fixed-frequency operation but sacrifices 1V start-up and shutdown control; LT1610IS5#TRMPBF matches the 1V minimum input but trades off current capability and adds no SHDN functionality-making LT1615IS5-1#TRMPBF optimal for battery-powered systems requiring both ultra-low IQ and programmable enable.
Availability
LT1615IS5-1#TRMPBF is available at Aetrix Electronics and suitable for LCD bias generation, handheld computer power management, and digital camera flash charging requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over –40°C to +85°C.
Supply support for LT1615IS5-1#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, datasheet documentation, and application engineering for legacy Linear parts including the LT1615 family.
The LT1615 series was designed specifically for ultra-low-power, single-cell portable applications demanding high-voltage outputs with minimal board area-targeting LCD bias, memory backup, and sensor interface power rails.
FAQ
What is the minimum input voltage required for LT1615IS5-1#TRMPBF to start switching?
The LT1615IS5-1#TRMPBF starts regulation at 1.0V (min) across temperature, verified per Electrical Characteristics table. This enables operation from deeply discharged alkaline or NiMH cells. Below 1.0V, the internal bandgap reference cannot stabilize, preventing reliable FB comparator operation. The LT1615IS5-1#TRMPBF will not oscillate or deliver regulated output until VIN exceeds this threshold.
Can LT1615IS5-1#TRMPBF be used in SEPIC topology, and what design changes are needed?
Yes, LT1615IS5-1#TRMPBF supports SEPIC operation as confirmed in Typical Applications section (Figure TA07). Replace the single inductor with two matched inductors (e.g., Murata LQH3C100K24), add coupling capacitor C3, and adjust feedback resistors for desired output. The 400ns off-time and 100mA current limit remain valid; inductor value calculation uses L = (VOUT + VD) × tOFF / ILIM.
What is the purpose of the 4.7pF capacitor in the feedback network of LT1615IS5-1#TRMPBF?
The 4.7pF capacitor (shown in Figures TA03, TA04, TA05, TA07, TA09) provides feed-forward compensation to reduce output voltage ripple. It couples high-frequency switching noise directly to the FB node, allowing the error amplifier to respond faster to transient load steps. This technique lowers ripple by >30% without increasing output capacitance-critical for noise-sensitive analog rails powered by LT1615IS5-1#TRMPBF.
How does LT1615IS5-1#TRMPBF behave during short-circuit conditions on the output?
When FB voltage falls below ~600mV (indicating severe overload or short), LT1615IS5-1#TRMPBF extends switch off-time to 1.5µs and reduces current limit to ~70mA (70% of nominal 100mA). This throttles average inductor current, limiting power dissipation in the internal NPN switch and external diode. Recovery is automatic once load normalizes and FB rises above 600mV.
Which Schottky diodes are recommended for use with LT1615IS5-1#TRMPBF in 20V-output applications?
For 20V-output applications, the Motorola MBR0530 (0.5A, 30V) is explicitly recommended in the datasheet (Typical Application TA01). Its 0.35V forward drop at 100mA and fast recovery minimize conduction and switching losses. Alternatives include Central Semiconductor CMDSH-3 (30V, 200mA) for lower current or Vishay SS32 (20V, 3A) for higher surge tolerance-provided reverse voltage rating exceeds 34V and package thermal resistance supports 100mA continuous.
LT1615IS5-1#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:
- 75mA (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
LT1615IS5-1#TRMPBF FAQ
1.How can I place an order for LT1615IS5-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1615IS5-1#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 LT1615IS5-1#TRMPBF reliable?
The price and inventory of LT1615IS5-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1615IS5-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1615IS5-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1615IS5-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1615IS5-1#TRMPBF?
LT1615IS5-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1615IS5-1#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 LT1615IS5-1#TRMPBF?
For technical support, including LT1615IS5-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1615IS5-1#TRMPBF requirements.
6.How does Aetrix verify that LT1615IS5-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1615IS5-1#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 LT1615IS5-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1615IS5-1#TRMPBF?
All LT1615IS5-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1615IS5-1#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 LT1615IS5-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT1615IS5-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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